Rake Demodulator Pdf

Direct Conversion Pulsed UWB Transceiver Architecture Raúl Blázquez, Fred Lee, David Wentzloff, Brian Ginsburg, Johnna Powell, Anantha Chandrakasan Massachusetts Institute of Technology 38-107, 50 Vassar St. Ha, Chairman Bradley Department of Electrical and Computer Engineering. In the digital demodulator block of Fig. If, in a mobile radio channel reflected waves arrive with small relative time delays, self interference occurs. Bugallo, Student Member, IEEE, Joaquín Míguez, Member, IEEE, and Luis Castedo, Associate Member, IEEE Abstract— This paper addresses the problem of blind multiple access interference (MAI) and inter-symbol interference (ISI). STS specific design. All algorithms for synchronization and data demodulation are implemented as software modules on a general purpose digital signal processor (DSP). Four Fingers The four fingers make up a front-end interface to the demodulator. 6 Multiple Antenna Systems and Space-Time Codes, 697 10. ¾A RAKE demodulator turns multiple path into diversity - mitigates the fading ¾Additional diversity by synchronization of multiple transmitters › Within a radio cell on the track › At both train ends. Generated an input random sequence of 8 bits. The output of the RAKE is then demultiplexed to remove the various physical layer control information such as pilot and power control bits, and passed trough the 2nd Interleaver. Almost twenty percent of the. systems have no need to use the Rake receiver to obtain good demodulation performance. • RAKE receiver patent 1956. In this thesis, we investigate several channel estimation techniques based on classical, and. Direct Conversion Pulsed UWB Transceiver Architecture Raúl Blázquez, Fred Lee, David Wentzloff, Brian Ginsburg, Johnna Powell, Anantha Chandrakasan Massachusetts Institute of Technology 38-107, 50 Vassar St. Fig -5: Principle RAKE Receiver Like a garden rake, the rake receiver gathers the energy received over the various delayed propagation paths. It allows the use of either BPSK and/or QPSK encoding, with the PN code. Gossain, R. Rake receiver contains many receiver sub-radios which are called nger which is responsible for tuning the individual multi-path components. This design integrates the code correlation and data demodulation of a RAKE receiver into a single package. iterative partially coherent demodulation and its application to frequency shift key(fsk) modulated signals by oluwatosin a. The modules of Doppler filter banks, threshold level test, and target detection module are newly introduced into the conventional rake receiver so that it can function as a radar system. ,Coimbatore , INDIA. 7) is described, which uses the transmitted data signal itself for real time channel measurement. Its processing is performed by hardware and firm-ware and controlled by the DSP. There are many types of modulation so there are many types of demodulators. Introduction. Ginsburg, Fred S. The received signal is de-spreaded at the tim-. spectral spikes in the PSM signal. algorithms such as Rake demodulator, channel equalizer, or mobile hand-off scheme. Models Number of Wheels Minimum Working Width Maximum Working Width. of Electronic and Information Engineering´ 10. 1 Elements of a Digital Communication System p. The capture effect is known to have a significant impact on the performance of wireless networks that employ some kind of random multiple-access mechanism. IEEE TRANSACTIONS ON ELECTRON DEVICES, VOL. A demodulator is an electronic circuit (or computer program in a software-defined radio) that is used to recover the information content from the modulated carrier wave. 25 MHz channels • CDMA – multiple users share a 1. Design of a digital modulator and demodulator for reader-less RFID Tag in 0. General rights. RAKE receiver power estimator and adaptive receiver filter. STS specific design. With short codes the implementation of cyclic processing structure is simpler. modulation and demodulation under SR1. • To deliver the same 2 bits, 4-PAM requires 4 dB more transmit power. Demodulator AGC PSSS Decoder PER Measurement Chip Synchronization Preamble + FD Generation COBI / PSSS Encoder Pulse Shaping Modulator MP + AWGN Channel Demodulator AGC COBI / PSSS Decoder PER Measurement Chip Synchronization Rake Channel Estimation etc. This will give us a good reception of WCDMA signal at the receiver end. com Abstract—High Speed Packet Access (HSPA), the latest evolu-tion of the Wideband Code Division Multiple Access (WCDMA). Almost twenty percent of the. HWANG 1-8 DSP for reality processing (1) Features of DSP algorithms Filtering, transform, coding and so on real time process throughput require high speed and massive computing capabilities large volume of data sophisticated algorithm reduced communication BW. MSEE Curriculum All MSEE students are required to take the following two core courses: • 3531-571 Linear systems • 3531-507 Probability and Random Processes. using MUD and beamforming. which first demonstrates that a time-frequency RAKE receiver does not obtain full diversity as it is not optimized on the transmit side. 13, 01062 Dresden, Germany Abstract— In wideband DS/SS systems the Rake receiver is found to suppress the IPI. 1, JANUARY 2007 267 Raise Your Voice at a Proper Pace to Synchronize in Multiple Ad Hoc Piconets Xiliang Luo, Member, IEEE, and Georgios B. a) Sketch diagrams of a modulator and demodulator for π/4 – ODQSK. Demodulator Rake Receiver Carrier (a) Analog Demodulator Decoder Data Output Output FER SNR Figure 4. Coherent RAKE receivers require a pilot tone for coherent demodulation. The fingers provide timing, Walsh chip accumulation and Walsh chip storage for the demodulation process. In the digital demodulator block of Fig. Advantages - Curved bars at the bottom for higher capacity and optimum material conveying. rakes aries studies Geological Engineering. DS-SS Transmitter Operation Spread spectrum modulation with Rake receiver. 6 com-pares Rake and conventional receiver BER using the conditions defined in table 1. A SYMBOL RATE MULTI-USER DOWNLINK BEAMFORMING APPROACH FOR WCDMA Michael Joham, Wolfgang Utschick, and Josef A. ON CHANNEL ESTIMATION FOR RAKE RECEIVER IN A MOBILE MULTIPATH FADING CHANNEL Fu Li and Heng Xiao Department of Electrical Engineering Portland State University Portland, OR 97207-0751, U. Nossek 10th IEEE International Symposium on Personal, Indoor, and Mobile Radio. n A RAKE receiver consists of a tapped delay-line that samples these peaks n Each peak usually suffers independent fading n This is a form of diversity inherently available in DSSS systems n In IS-95 systems the RAKE receiver has three “fingers” n It can sample three such peaks simultaneously. I The optimum demodulator consists of a bank of matched lters and a maximal ratio combiner (MRC). 12 Theory of Frequency Modulation 16. 25 MHz channels • CDMA - multiple users share a 1. ppt), PDF File (. products sale 2019. It is shared by multiple users by each user indepen-dently and randomly transmitting a. In order to get a better estimation of the attenuation in the communication channel at the receiver, we use adaptive RAKE receiver [2] as shown in Figure 3. - Stainless steel chains and sprockets. Price Low and Options of Buffing Wheel Rake Replacement Wheel Rake Brownells Se from variety stores in usa. multiplied by the duration of onebit. All algorithms for synchronization and data demodulation are implemented as software modules on a general purpose digital signal processor (DSP). A, Sreenath R. A differential space-time block code (DSTBC) modulation scheme is used to improve the performance of DS-CDMA systems in fast time-dispersive fading channels. Notes/Equations. Advantages - Curved bars at the bottom for higher capacity and optimum material conveying. Also, the RAKE receiver uses conventional demodulation in the second stage and conventional maximal ratio combining (MRC) in the third stage to reduce multiple access interference (MAI) and the other interferences. Likelihood-Based Demodulation in Multi-User Chaos Shift Keying Communication Article (PDF Available) in Circuits Systems and Signal Processing 27(6):847-864 · April 2008 with 57 Reads. Maximum Ratio Combining Diversity Various techniques are known to combine the signals from multiple diversity branches. • Amplitude Modulation and Demodulation Frequency Modulation and Demodulation • Pre Emphasis – De Emphasis Circuits • Verification of Sampling Theorem • PAM and Reconstruction • PWM and PPM :Generation and Reconstruction • Effect of Noise on the Communication Channel 3. algorithms such as Rake demodulator, channel equalizer, or mobile hand-off scheme. 7 The decorrelating detector. Some Benchmark MultipathPerformance Data ofCoherent CSK DigitalCommunication Systems Yongxiang Xia, Chi K. A rake receiver is a radio receiver designed to counter the effects of multipath fading. PART D - Channel Coding 8. Icera’s competitors point out that a truly flexible baseband, however implemented, should have larger size and higher power consumption than air-interface specific basebands. Ferrante, Student Member, IEEE, Jocelyn Fiorina, Member, IEEE, Maria-Gabriella Di Benedetto, Senior Member, IEEE. Box 146, Beijing 100876. a standard DSSS or CDMA receiver known as a Rake demodulator. Personal use of this material is permitted. Rakesh Vanam Varun Venkatraman Electrical Engineering Department, Cleveland State University, Cleveland. The digital detector/demodulator reverses the process and extracts the binary baseband information from the received modulated signal which has been subjected to noise, interference and other distortions. International Journal of Engineering Science Invention ISSN (Online): 2319 – 6734, ISSN (Print): 2319 – 6726 www. Block Equalization and Generalized MLSE Arbitration for the HSPA WCDMA Uplink Gregory E. 6 com-pares Rake and conventional receiver BER using the conditions defined in table 1. Mullard Technical Handbook Book 1 Part 2 Transistors BFQ10 to OC36 & 2N numbers September 1974 Mullard Ltd. NAVAL POSTGRADUATE SCHOOL MONTEREY, CALIFORNIA DISSERTATION Approved for public release; distribution is unlimited. The design highlights the ease of use, performance, and efficiency of implementing a design using Altera devices and DSP intellectual property (IP) cores. A pressure transducer, often called a pressure transmitter, is a transducer that converts pressure into an analog electrical signal. Accord Software and Systems Pvt. 0 RX Packets ACK Sent through Wired Network RECEIVER. The GA is then employed to equalize the output signals fro m the RAKE demodulator. was developed for data demodulation in transmit reference systems in [12]. Therefore, in a multi-path propagation situation a Rake Receiver structure [6] may help to combine the power from multiple paths and bring the overall signal to detectable levels. Frequency-hopping systems generate their wide band by transmitting at different frequencies, hopping from one frequency to another according to the. instruments have rake receivers with 51 fingers and measure up to six carri-ers at the same time. the method of demodulator implementation, eg hardware or software. ” (Just next to eq. For UWB-FM, the delay-line FM demodulator followed by the FSK demodulator presented in [11, pp. 3B, the inventive Rake finger 111 of Rake receiver 300 includes despreaders 305, 310, a TBC/FBI bit processor 315, a frequency offset estimator 320, a complex weight gain generator 325, an alpha delay element 330 and a demodulator (or complex multiplier) 335. This feature motivates the use of RAKE multi- path combining techniques to provide diversity and to capture as much energy as possible from the received signal. What I have done so far is this: 1. Rake receiver Smart antennas HW components SW components VLSI DSP 2008 Y. A RAKE-structure is used to resolve the time diversity due to multipath propagation. EP1361670B1 - Common data path rake receiver for a CDMA demodulator circuit - Google Patents Common data path rake receiver for a CDMA demodulator circuit Download PDF. SIB7 (UL Interference) reports whether there is high level interference in a cell. PERFORMANCE OF COHERENT AND NONCOHERENT RAKE RECEIVERS WITH CONVOLUTIONAL CODING RICEAN FADING AND PULSE-NOISE INTERFERENCE by Kyle Kowalske June 2004 Dissertation Supervisor: Clark Robertson. LΔ=0, is introduced and its corresponding block diagram is shown in Fig. 3B, the inventive Rake finger 111 of Rake receiver 300 includes despreaders 305, 310, a TBC/FBI bit processor 315, a frequency offset estimator 320, a complex weight gain generator 325, an alpha delay element 330 and a demodulator (or complex multiplier) 335. Tsinghua University, 1990, Beijing, China A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in the School of Engineering Science @ Michael Xiaolong Li 1996 SIMON FRASER UNIVERSITY. PART D - Channel Coding 8. In this example, FMCOMMS3 is used as RF front-end, which captures the modulated QPSK signals over the air. edu Abstract Ultra-wideband (UWB) communication is an emerging. In bursty transmissions, the signal is transmitted only as needed and the interference is correspondingly reduced. A RAKE-structure is used to resolve the time diversity due to multipath propagation. 2 Demodulation and Detection, 3. There are many diversity techniques to address fading issue, such as OFDM, MIMO, RAKE receiver and etc. Advanced Wireless Communications lecture notes: section 1 Andrea M. Trade-offs of the system is discussed for different channel conditions and different capacity requirement. Locally Optimal Soft Handoff Algorithms Rajat Prakash and Venugopal V. In the fifth chapter the necessity of the raised cosine-filter and the benefits of. Ferrante, Student Member, IEEE, Jocelyn Fiorina, Member, IEEE, Maria-Gabriella Di Benedetto, Senior Member, IEEE. Preface vi What Is the CDMA Reference Blockset? The CDMA Reference Blockset is a collection of Simulink® blocks designed to help you develop and simulate CDMA wireless communication systems, based. A direct-sequence spread-spectrum (DSSS) coherent RAKE-receiver demodulating M-ary phase-shift keyed (MPSK) signals is presented for microcellular communication systems with frequency-selective fading channels. 2 Spread spectrum modulation and demodulation 8 2. The design uses the correlator, FIR compiler, and NCO compiler. Modular Prototyping Platforms for Pulsed-UWB David D. A Modified Multicarrier Modulation Binary Data Embedding in Audio File Gelar Budiman1, Andriyan B. TurboCoding. The design problem is posed as a tradeoff between three metrics: the rate of handoffs, the mean size of the active set, and the link quality. I tried the "fail gracefully" demodulator and whilst there wasn't any sandpaper, there wasn't much four-channel effect either. In normal operating conditions with random propagation delays, however, the improvement would become evident. The modules of Doppler filter banks, threshold level test, and target detection module are newly introduced into the conventional rake receiver so that it can function as a radar system. 286 IEEE TRANSACTIONS ON SIGNAL PROCESSING, VOL. This new approach is insensitive to the mismatch of the two branches in the outphasing structure. September 9, 2008 9:24 World Scientific Review Volume - 9. , BITS EDU Campus Vernama, Gujarat, India Upena Dalal, Ph. This paper reports on the. 5700 Pacific Rim Boulevard Camas, WA 98607, U. not required. Rake combining can improve the BER performance if the channel frequency-selectivity is not too strong (or the number L of resolvable paths is not too large). More specifically, power control algorithm may be implemented in C language. Suksmono2, Donny Danudirdjo3, Koredianto Usman4, and Dong Hwan Shin5 School of Electrical and Informatics Engineering, Institut Teknologi Bandung1,2,3,4 Markany Inc. Due to time and work-load constraints there will be no actual wireless link involved. The outputs of each correlator are weighted to provide better estimate of the transmitted signal than is provided by a single component. The received signal is de-spreaded at the tim-. 25 MHz channels • CDMA – multiple users share a 1. Ashok, & D. Rohde&Schwarz R&S®PR100 Radio Interference Detection and Analysis 5 The following is a list of common terms associated with the detection of interference in mobile radio network systems: J RFI indicators, impact of RFI on mobile radio networks J Downlink RFI (forward base frequency band), mobile interference. Abstract Time reversal, that is prefiltering of transmitted signals with time reversed channel impulse responses,. 5, the sampled. The signal model for long code WCDMA after the removal2 of major frequency offset by the frequency track-ing loop and with known timing by a searcher is. of BPSK, 267; over a CDMA channel with Rake receiver, 483; with coherent demodulation in Rayleigh fading, 403 of CDMA, with orthogonal signature waveforms, 466 of DBPSK, 394 of duobinary signaling, 360 of general binary modulation in AWGN, 197-201 of M-ASK, 309 of M-FSK, 325-328 of M-L code: with sequence demodulation (Viterbi. Pulse-position modulation PPM is a. 5 Wiener filter. 1 Class lectures: The class lectures are designed to provide a. the discrete sampling grid of the RAKE receiver. space time coding and demodulation technique for multi-path fading channel (Rake receiver) is introduced in this Section. Notice that in such cases, IFI and ISI emerge. Rake receiver. The received signal is despread in 8 arms at the baseband using a digital time-integrating correlator (TIC). The destination data is nothing but the transmitted data. Its processing is performed by hardware and firm-ware and controlled by the DSP. 1 The adaptive correlator receiver. It does this by using several "sub-receivers" called fingers, that is, several correlators each assigned to a different multipath component. Interferencemitigationis oneofthemostimportanttasks in the sense of improving overall system performance and capacity. Electronics Dept. com Abstract - The origins of Spread spectrum. Demodulation is extracting the original information-bearing signal from a carrier wave. There are many types of modulation so there are many types of demodulators. Wireless Glossary and Dictionary [N-R] NACN: North American Cellular Network North American Cellular Network (NACN) is an organization of cellular providers that facilitates cellular calls across the country to be linked for seamless roaming. Lau Department of Electronic and InformationEngineering, HongKong PolytechnicUniversity, HongKong, China. the BER of the Rake should be minus or to the power of negative, which means the. Robustness of Time Reversal vs. ON CHANNEL ESTIMATION FOR RAKE RECEIVER IN A MOBILE MULTIPATH FADING CHANNEL Fu Li and Heng Xiao Jin Yang Department of Electrical Engineering Portland State University Portland, OR 97207-0751, U. In this paper, we introduce RAKE receivers for UWB systems with PPAM modulation. A spatial RAKE receiver is present, which utilize the multi-path effect of the UWB channel. The most popular technique so far to suppress NBI is to use rake receivers [3] which are also highly complex and their complexity increases depending on the number of rake ngers employed [1]. Ueda, '99 VLSI Circuits Short Course. The design problem is posed as a tradeoff between three metrics: the rate of handoffs, the mean size of the active set, and the link quality. Each firing, 2 Output tokens for QPSK, 3 Output tokens for 8PSK and 4 Output tokens for 16QAM are produced when 1 Input token and 1 Pilot token are consumed. 8 Transistor AM Modulator 16. Pulse-position modulation (PPM) is a form of signal modulation in which M message bits are encoded by transmitting a single pulse in one of possible required time shifts. • Two multipath signals are resolvable only if their relative delay exceeds the chip pe-riod T c. The detected output bits are then converted to characters and sent to the VGA subsystem. 1 The adaptive correlator receiver. used in a RAKE receiver and in a Viterbi demodulator, both of them programmable. 8psk ask bpsk bueno fsk httpwwwmathworksc it is very nice modulation techus modulations ook popular file 2008 popular file 2010 popular file 2011 popular file 2012 qam qpsk rake sphere decoding Cancel. , [13], [14], but they are all confined to the data demodulation module only. One approach to reduce this interference, known as frequency-division multiplexing, allocates different carrier frequencies to different users (or for dif-. What is the highest bit rate that can be achieved? Question 6 (8 marks). Corresponding receivers use a similar RAKE receiver for signal demodulation. Well i hv been workin on the simulation of Rake Receiver using MATLAB. 7, JULY 2006 Low-Complexity Blind Synchronization and Demodulation for (Ultra-)Wideband Multi-User Ad Hoc Access Xiliang Luo, Student Member, IEEE, and Georgios B. Multi Rake MR. The digital back end detects the presence of an interferer and estimates its frequency that may be used in the front end notch filter. Without the infor-mation about the correct RAKE weights, the systems suffer a performance loss by using sub-optimal RAKE structures e. However, as the number of users increases, the performance of RAKE receivers degrade due to the non-zero cross correlation between the spreading sequences with arbitrary time shifts. 26, page 7). 4 Tapped-delay line prediction filter 13 2. For OFDM demodulation, an FFT algorithm based on cascaded twiddle factor decomposition has been selected. In this section, we present a canonical characterization of the mobile wireless CDMA channel developed in [6] and [7], which guides the development of our time-selective signaling scheme. Rakesh Vanam Varun Venkatraman Electrical Engineering Department, Cleveland State University, Cleveland. of ECS, University of Southampton, SO17 1BJ, UK. Mitigation Data Effects of Direct Spreading PN Sequence Generator PN Sequence 3. – Commercial introduction in 1995. txt) or view presentation slides online. 11g standard, very efficiently uses frequencies and is suitable for high-speed transmissions, aside from the fact that it is the method being adopted by various digital transmission systems that are not limited to. I tried the "fail gracefully" demodulator and whilst there wasn't any sandpaper, there wasn't much four-channel effect either. Introduction to MIMO, MIMO Channel Capacity 2. Miguel Rodrigues Demodulator LPFLPF. A Modified Multicarrier Modulation Binary Data Embedding in Audio File Gelar Budiman1, Andriyan B. Lee, Vivienne Sze, Anantha P. The output of the rake receiver is fed to the equalizer for filter the white noise presence in the receiving signal. What I have done so far is this: 1. Pados,yStella N. Mamun Ibne Reaz and Jubayer Jalil and Labonnah F. used in a RAKE receiver and in a Viterbi demodulator, both of them programmable. Even if a BCH feature is supported in the future, it will not be possible to do a simultaneous BCH demodulation of 2 frequencies due to the time it takes to demodulate BCH. (2) that; PSD of the first derivative of the Gaussian "monocycle" pulse does. Maric Abstract— An adaptive coding scheme is introduced for a discrete sequence code-division multiple-access system. Three varieties of RAKE receivers commonly found in literature are investigated: ARAKE, S-RAKE, and P-RAKE. The signal model for long code WCDMA after the removal2 of major frequency offset by the frequency track-ing loop and with known timing by a searcher is. The determination of optimal modulation and demodulation techniques critically depends on accurate channel characteriza-tion. This design integrates the code correlation and data demodulation of a RAKE receiver into a single package. Demodulator A/D Converter Zero point Gain Sensor type Cal. at the output of the demodulator and input of the decoder. The analogue IF to digital IF conversion is performed by a sampling analogue to digital converter (ADC). diagram of the demodulation processing unit de-veloped. Miguel Rodrigues Demodulator LPFLPF. The main part of the procedure is illustrated. detector/demodulator, DAC and destination, form the receiver. The signal model for long code WCDMA after the removal2 of major frequency offset by the frequency track-ing loop and with known timing by a searcher is. Even if a BCH feature is supported in the future, it will not be possible to do a simultaneous BCH demodulation of 2 frequencies due to the time it takes to demodulate BCH. The high levels of expected performance, as well as the required data-rates will call for the implementation of advanced algorithms in. A terrestrial outdoor HDTV antenna is essential to receive television. The determination of optimal modulation and demodulation techniques critically depends on accurate channel characteriza-tion. Ueda, '99 VLSI Circuits Short Course Digital Signal Processors for Mobile Phone Terminals Katsuhiko Ueda Matsushita Electric Ind. For a 16bit data-path, we have observed a 24. Bit Constraint Parameter Decision Method for CDMA Digital Demodulator Kyungtae Han, Iksu Eo, Kyungsu Kim and Hanjin Cho Communication Digital IC Team, Micro-Electronics Technology Laboratory Electronics and Telecommunications Research Institute. Some Benchmark MultipathPerformance Data ofCoherent CSK DigitalCommunication Systems Yongxiang Xia, Chi K. Our ggpoal is to come up with a high-efficient and low-cost channel estimation and equalization scheme to replace the traditional Rake receivers for DS-CDMA systems. 9 Demodulation performance in multipath fading with closed loop. Robustness of Time Reversal vs. Also studied is the performance when a Rake demodulator is employed. Assuming that and are equally probable i. the method of demodulator implementation, eg hardware or software. The Rake receiver is consists of a line of delayed cross-correlators i. requiring only demodulation that the DSP provides. This zero-crossing-counter demodulator will be modeled in the latter part of the experiment and used for demodulation low frequency FM. Without the infor-mation about the correct RAKE weights, the systems suffer a performance loss by using sub-optimal RAKE structures e. Four Fingers The four fingers make up a front-end interface to the demodulator. Demodulation begins with unsynchronized in-phase (I) and quadrature-phase (Q) values from the USRP device. IEEE TRANSACTIONS ON ELECTRON DEVICES, VOL. 84 Mcps ⇒ Tchip = 0. ON CHANNEL ESTIMATION FOR RAKE RECEIVER IN A MOBILE MULTIPATH FADING CHANNEL Fu Li and Heng Xiao Jin Yang Department of Electrical Engineering Portland State University Portland, OR 97207-0751, U. Frequency hopping 133. Demodulation is extracting the original information-bearing signal from a carrier wave. posed of tamed spread spectrum modulation and demodulation, frequency hopping modulation and demodulation with synchronization function, 4FSK modulation and demodulation and Rake Receiver. The structures of the base station model and the coupled Rake receiver model are elaborately discussed in this. A systematic introduction to body area networks (BAN), this book focuses on three major parts: channel modeling, modulation/demodulation communications performance, and electromagnetic compatibility considerations. The received signal is de-spreaded at the tim-. 13, 01062 Dresden, Germany Abstract— In wideband DS/SS systems the Rake receiver is found to suppress the IPI. if the received signal is is greater than 0, then the receiver assumes was transmitted. Written for and incorporated in the osmocom rtl-sdr project. The prerake scheme shifts RAKE receivers' related signal processing needs to the transmitter side and helps combat narrow-band. Combined Adaptive RAKE Diversity (ARD) and Coding for DPSK DS/CDMA Mobile Radio Akihiro Higashi, Member, IEEE, and Tadashi Matsumoto, Member, IEEE Abstract-A new diversity combining scheme, adaptive RAKE diversity (ARD), is proposed for differential PSK direct sequence code division multiple access @S/CDMA) mobile communications system. of ECS, University of Southampton, SO17 1BJ, UK. Whether you've loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them. , [13], [14], but they are all confined to the data demodulation module only. 7 Sideband Frequencies in AM Wave 16. which first demonstrates that a time-frequency RAKE receiver does not obtain full diversity as it is not optimized on the transmit side. This receiver allows us to trade off power dissipation with signal processing complexity, quality of service and data. A rake receiver is a radio receiver designed to counter the effects of multipath fading. The output of the RAKE is then demultiplexed to remove the various physical layer control information such as pilot and power control bits, and passed trough the 2nd Interleaver. A Rake demodu-lator consists of a number of parallel channels each of which processes the incoming DSSS bitstream by a process known as autocorrelation. Transceiver Architectures for Impulse Radio Systems with M-ary Modulation Schemes DEMODULATOR MODULATOR PULSE To compare conventional RAKE and reduce. , State College, PA 16801. RAKE receiver power estimator and adaptive receiver filter. This can be heard, using FM demod, or in Zero span, observed. edu Abstract Ultra-wideband (UWB) communication is an emerging. 4 Tapped-delay line prediction filter 13 2. Some Benchmark MultipathPerformance Data ofCoherent CSK DigitalCommunication Systems Yongxiang Xia, Chi K. Reverse_Rake. Ltd, Bangalore, India. Symbols 4-ary biorthogonal keying. 8GHz Alexander Lackpour, Mohsen Kavehrad, Scott Thompson* Center for Information and Communica tions Technology Research (CICTR) Department of Electrical Engineering, Pennsylvania State University, University Park, PA 16802 *Anntron Inc. Rake receiver circuit and method for operating a rake receiver circuit. Each Rake finger consists of two multipliers for applying. This type of algorithm combines high spatial and tempo-ral regularity in the FFT data-flow graphs with a minimal number of computations. that of 2D RAKEs, the proposed scheme exhibits relatively equivalent performance of 2D RAKEs while having less computation load due to utilising adaptive signal processing in subbands. Due to time and work-load constraints there will be no actual wireless link involved. Reducing dynamic power consumption in next generation DS-CDMA mobile communication receivers 129 specifications of a next-generation wireless standard (IMT-2000) in Ojanperä and Prasad (2001). 2 Effect of multipath on the received signal vector 42 3. To recover the transmitted data, the digital demodulator typically decodes the received symbols using Viterbi algorithm[4]. (a-1) Derive the probability density function (PDF) of the fading power and deduce the power outage probability in terms of Ω and Tp? (a-2) Evaluate this outage probability for Ω= 20 dB and Tp = 5 dB. 11af signals, Digital Television signals and custom waveform demodulation. Rake processor (search, track) Adaptive rake Demodulator FEC: Turbo, Viterbi MUD, ICU beam forming Sample rate selection, filter coefficients Digitally controlled analog loop ( Σ∆ based) Building the System •Device technology is part of the solution •The software/IP is getting harder than the hardware •Design methodologies for. 1 1 The Last Mile: Wireless Technologies for Broadband and Home Networks Carlos Cordeiro, H. This data is treated as being interleaved, that is, the demodulation module sends. Abstract : The performance of coherent and noncoherent RAKE receivers over a fading channel in the presence of pulse-noise interference and additive white Gaussian noise is analyzed. A direct-sequence spread-spectrum (DSSS) coherent RAKE-receiver demodulating M-ary phase-shift keyed (MPSK) signals is presented for microcellular communication systems with frequency-selective fading channels. Channel model and SNR performance 4. Methodology: Getting knowledge over different modulation and demodulation techniques. In order to get a better estimation of the attenuation in the communication channel at the receiver, we use adaptive RAKE receiver [2] as shown in Figure 3. Giannakis, Fellow, IEEE. Rake Receiver Detection of Adaptive Modulation Aided CDMA over Frequency Selective Channels Byoung-Jo Choi and Lajos Hanzo 1 Dept. How is this different from Equal Gain Combining (EGC) scheme ?? The output SNR of EGC is the sum of the SNRs on all brances. The received signal is despread in 8 arms at the baseband using a digital time-integrating correlator (TIC). space time coding and demodulation technique for multi-path fading channel (Rake receiver) is introduced in this Section. Demodulation of DSB signal by means of a product detector DSB modulator + + Coherent DSB demodulator Recovered carrier Remarks: † For the sake of simplicity, ka = 1 and Ar = Ac have been chosen † Low-pass filter at the detector output suppresses the sum-frequency output G´eza KOLUMBAN — Dept. If, in a mobile radio channel reflected waves arrive with small relative time delays, self interference occurs. See 4-BOK asymptomatic pdf of aggregate noise, 398–400 demodulator structure, RAKE receivers, 284 design. This example simulates digital communication over an AWGN channel. RAK Receiver EOctober 9, 2012 Diversity Techniques By Diwaker Pant 19 20. RAKE receiver is an extension of the matched correlator receiver. This input sequence simulates the information signal to be sent to the channel for retrieving by the RAKE receiver. A pressure transducer, often called a pressure transmitter, is a transducer that converts pressure into an analog electrical signal. Comparison of Frequency Domain Equalizers to Time Domain Equalizers in WCDMA Yaqoob, Muhammad Atif 2009 Document Version: Publisher's PDF, also known as Version of record Link to publication Citation for published version (APA): Yaqoob, M. Effect of Multiple Fingers on Receiver Performance in CDMA Forward Link Twinkle V. 11a standard and the IEEE802. The demodulation is performed in the Rake fingers by correlating the received signal with a spreading code over a period corresponding to the spreading factor. The Rake receiver is consists of a line of delayed cross-correlators i. A spatial RAKE receiver is present, which utilize the multi-path effect of the UWB channel. The traditional approach uses a coarse delay estimation unit to find the appropriate tap values, and then triggers delay-locked loops (DLLs) connected to the finger to track the multipath. 5 Wiener filter. Furthermore, NBI may exist as a transient in the system which. OFDM Issues – PAPR 5. PERFORMANCE COMPARISON OF AWGN AND SLOW FADING CHANNEL FOR WIRELESS COMMUNICATION SYSTEM 83 Fig. Given knowledge of the radar signal component r(t), the. the 16 Arcadia Drive • North Kingstown, RI 02852-1666 • USA 401/884-7930 FAX 401/884-7950. This receiver allows us to trade off power dissipation with signal processing complexity, quality of service and data. 13, 01062 Dresden, Germany Abstract— In wideband DS/SS systems the Rake receiver is found to suppress the IPI. The block diagram of the simulator is depicted in Figure 3. Due to time and work-load constraints there will be no actual wireless link involved. There are many types of modulation so there are many types of demodulators. Rake Receiver - Free download as Powerpoint Presentation (. ; Review of the background required for the course in two chapters—Includes one chapter on linear system analysis with emphasis on the frequency domain approach and Fourier techniques, and one chapter on probability, random variables, and random processes. BCH Demodulation is a powerful solution for: a.