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The proposed receiver consists of a RAKE receiver, multiuser detector, multiple access interference cancellation, soft-decision channel decoder and decision feedback from the decoder. The conventional and our generalized multistage multiuser detectors are both simulated in the proposed receiver. The simulation results show that the interference cancellation based receiver significantly.
Course Overview. UMTS (W-CDMA) is one of the third generation wireless systems. UMTS is designed to increase a subscriber’s data rates and system capacity.
RAKE receiver with LMS adaptive combiner demonstrates a good balance between performance, computation complexity and required length of the training sequence. II. Due to the simplicity of the algorithm and a reasonable sampling rate, this structure is feasible for practical VLSI implementations. III. Acknowledgements This thesis could not come through without the help of many wonderful people.Spread spectrum generally makes use of a sequential noise-like signal structure to spread the normally narrowband information signal over a relatively wideband (radio) band of frequencies. The receiver correlates the received signals to retrieve the original information signal. Originally there were two motivations: either to resist enemy efforts to jam the communications (anti-jam, or AJ), or.A RAKE receiver includes an arithmetic circuit for weighting coefficients. The arithmetic circuit obtains the signal power for each path from the reception amplitude on the path which is detected by a transmission path characteristics detector, and also obtains the interference powers from the reception amplitudes on two other paths which are respectively detected by transmission path.
By combining the powerful RAKE receiver concept for a frequency selective channel with space-time decoding, it is shown that the performance of mobile receivers operating in the presence of channel fading can be improved significantly. The proposed receiver consists of a bank of decorrelating filters designed to suppress the multiple access interference embedded in the received signal before.
Rake-Based Cellular Radar Receiver Design for. into the conventional rake receiver to function as a radar system. Using both a DFB and a TLT, the receiver sequentially tests the DSF and signal-to-noise ratio (SNR) of the received signal (namely, radar measurements) against the predefined threshold level to determine target detection. Such two-step threshold testing is suggested for adaptive.
European Journal of Scientific Research is a peer-reviewed scientific research journal that addresses both applied and theoretical issues. The scope of the journal encompasses research articles, original research reports, reviews, short communications and scientific commentaries in the fields of applied and theoretical sciences, biology, chemistry, physics, zoology, medical studies.
We present the concept of an acoustic rake receiver (ARR) — a microphone beamformer that uses echoes to improve the noise and interference suppression. The rake idea is well-known in wireless communications. It involves constructively combining different multipath components that arrive at the receiver antennas. Unlike typical spread-spectrum signals used in wireless communications, speech.
An advanced RAKE structure is the generalized RAKE (G-RAKE) receiver (6, (8)(9)(10). In contrast to conventional RAKE reception, the G-RAKE comprises extra fingers to collect information about.
RAKE receiver utilizes multiple correlators to separately detect strongest multi -path components. Each correlator detects a time -shifted version of the original transmission, and each finger correlates to a portion of the signal, which is delayed by at least one chip in time from the other fingers. The outputs of each correlator are weighted to provide bett er estimate of the transmitted.
A Rake Receiver can be seen as filter matched to the spreading code, pulse shaping filter and multipath channel. It is a combination of specified number of elementary receivers called Rake fingers. Each finger is associated with one of the multipath signals. The outputs of the Rake fingers are combined to detect the transmitted symbols. Fig.1 shows the Generalized Rake Receiver. Fig.1.
The same concept again The idea to boost the strong signal components and attenuate the weak (relatively noisy) components, as performed in MRC diversity, is exactly the same as the type of filtering and signal weighting used in the matched filter receiver.
The RAKE receiver used in existing systems suffers from significant performance degradation due to the rapid channel variations encountered under fast fading. We show that the Doppler spread induced by temporal channel variations in fact provides another means for diversity that can be further exploited to combat fading. We develop the concept of Doppler diversity and propose a framework that.
The second is known as selective Rake (SRake) and combines the instantaneously strongest multipath components. We evaluate and compare the link performance of these Rake receivers in different UWB.
On Space-Time Rake Receiver Structures for WCDMA Christopher BrunneK'l Martin Haardt, ' and Josef A. Nossek 1. Siemens AG, ICN CA. Note that the concept of the compressed space-time rake is related to the reduced dimension space-time rake inm- duced in (3). However, instead of using a parameter estima- tion scheme to obtain the channel parameters such as delays and directions of arrival, we.