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An iterative algorithm for asynchronous coded multiuser detection
1998
IEEE Communications Letters
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A multiuser detection algorithm, applicable to asynchronous users having the same signaling waveform and power levels, is presented. ...
The algorithm is derived from iterative techniques for crossentropy minimization, similar to turbo decoding. ...
In conclusion, an algorithm has been presented for iterative multiuser detection for nonspread asynchronous users sharing the same channel. ...
doi:10.1109/4234.709440
fatcat:rdabdwzax5fw5o3pqv5y2tsilu
Optimization of LDPC-coded turbo CDMA systems
2005
IEEE Transactions on Signal Processing
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We consider the analysis and design of low-density parity-check (LDPC) codes for turbo multiuser detection in multipath code division multiple access (CDMA) channels. ...
For the case of asynchronous multipath fading channels, the extrinsic messages can be approximated by a mixture of symmetric Gaussian distributions. ...
As shown in the lower part of Fig. 1 , the overall receiver is an iterative receiver that performs turbo multiuser detection by passing extrinsic messages on the code bits between a SISO multiuser detector ...
doi:10.1109/tsp.2005.843726
fatcat:dhei5pwdejdx5ehfwoaknvps34
Coded modulation assisted iterative parallel interference cancellation aided CDMA
2003
2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484)
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In the context of the 8PSK TCM/TTCM CDMA schemes typically two iterations are necessary for approaching the best possible performance attained with the aid of an infinite number of iterations. ...
In this contribution we investigate Trellis Coded Modulation (TCM) and Turbo Trellis Coded Modulation (TTCM) assisted iterative parallel interference cancellation aided CDMA schemes. ...
In our approach, we propose a novel symbol probability based iterative multiuser detection assisted receiver for employment in a Trellis Coded Modulation (TCM) and Turbo Trellis Coded Modulation (TTCM) ...
doi:10.1109/vetecf.2003.1285193
fatcat:gh6hu57ojbegtewzcb77hsit4u
Belief propagation-based joint iterative algorithm for detection and decoding in asynchronous CDMA satellite systems
2013
EURASIP Journal on Wireless Communications and Networking
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In this paper, a joint chip-level algorithm for CDMA multiuser detection and LDPC decoding with a new and simple iterative structure based on belief propagation (BP) for satellite systems is developed, ...
which integrates the iterations of multiuser detection and the iterations of LDPC decoding with factor graphs. ...
In [5] [6] [7] , an iterative MMSE detection algorithm for the coded CDMA system was presented, which feeds the extrinsic information of the decoder back to the iterative MMSE detector. ...
doi:10.1186/1687-1499-2013-234
fatcat:xdld65tlvnf67dckunc32mnquu
Turbo greedy multiuser detection
2001
IEEE Journal on Selected Areas in Communications
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Recently, a novel scheme for iterative multiuser detection and turbo decoding was proposed by Damnjanovic and Vojcic. ...
The extrinsic probabilities for the coded bits of the interfering users, obtained after each turbo decoding iteration, are used as a priori probabilities in the following multiuser iteration and the extrinsic ...
In [13] , the authors investigated the use of log-MAP [10] , [21] algorithm in their iterative scheme for both multiuser detection and decoding for a convolutionally coded asynchronous multiuser system ...
doi:10.1109/49.942524
fatcat:llv45v2g7zferefkrqll3cwfbu
A sliding window PDA for asynchronous CDMA, and a proposal for deliberate asynchronicity
2003
IEEE Transactions on Communications
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Index Terms-Asynchronous code-division multiple access (CDMA), code-division multiple access (CDMA), multiuser detection, overloaded system, probabilistic data association (PDA). ...
In the first part, the probabilistic data association (PDA) method is extended to multiuser detection over symbol-asynchronous code-division multiple access (CDMA) communication channels. ...
of many multiuser detection algorithms. ...
doi:10.1109/tcomm.2003.820726
fatcat:xc2hvlelqrdlfpiye5nqz2kxia
Blind adaptive space-time multiuser detection with multiple transmitter and receiver antennas
2002
IEEE Transactions on Signal Processing
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In this paper, we consider space-time multiuser detection using multiple transmit and receive antennas for code-division multiple-access (CDMA) communications. ...
We also develop blind adaptive implementations for the two transmit/two receive antenna case for synchronous CDMA in flatfading channels and for asynchronous CDMA in fading multipath channels. ...
Algorithm 2 [Blind Adaptive Linear Space-Time Multiuser
IV. BLIND ADAPTIVE SPACE-TIME MULTIUSER DETECTION FOR ASYNCHRONOUS CDMA IN FADING MULTIPATH CHANNELS
A. ...
doi:10.1109/tsp.2002.1003052
fatcat:cb7syu4vczdztp7w27mf7pkuti
Adaptive Iterative Soft-Input Soft-Output Parallel Decision-Feedback Detectors for Asynchronous Coded DS-CDMA Systems
2005
EURASIP Journal on Wireless Communications and Networking
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First, we derive the optimum SISO parallel decision-feedback detector for asynchronous coded DS-CDMA systems. ...
In this paper, we employ adaptive algorithms in the SISO multiuser detector in order to avoid the need for this a priori information. ...
multiple-access interference (MAI) by iteratively combining multiuser detection and single-user decoding. ...
doi:10.1155/wcn.2005.155
fatcat:7mrkr5wsx5aslgasoqs26tyhfi
A PDA-Kalman approach to multiuser detection in asynchronous CDMA
2002
IEEE Communications Letters
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The Probabilistic Data Association (PDA) method for multiuser detection in synchronous code-division multiple-access (CDMA) communication channels is extended to asynchronous CDMA, where a Kalman filter ...
The algorithm has ( 3 ) complexity per time frame, where is the number of users. Index Terms-Code-division multiple access, filtering, multiuser detection, probabilistic data association. ...
In this letter, a new multiuser detection scheme for asynchronous CDMA channels is introduced. ...
doi:10.1109/lcomm.2002.805524
fatcat:lean2erc7zeuvopy7yxt6gadri
Multiuser decoding for multibeam systems
2000
IEEE Transactions on Vehicular Technology
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An iterative multiuser decoding algorithm for co-channel BPSK/QPSK users in a multibeam system is presented. ...
The complexity of the algorithm is approximately (2 + 2 ) operations per bit per iteration where is the number of co-channel users and is the constraint length of the forward error correction code. ...
Illustration of iterative multiuser detection algorithm.
Fig. 7 . 7 Fig. 7. ...
doi:10.1109/25.875232
fatcat:efhm4dj2znddxi3bnh3rzsoqqq
Performance Analysis of Iterative Channel Estimation and Multiuser Detection in Multipath DS-CDMA Channels
2007
IEEE Transactions on Signal Processing
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This paper examines the performance of decision feedback based iterative channel estimation and multiuser detection in channel coded aperiodic DS-CDMA systems operating over multipath fading channels. ...
These results are then combined to characterize the evolution of the performance of a system that iterates among channel estimation, multiuser detection and channel decoding. ...
(We chose PIC and LMMSE for multiuser detection because they can be implemented with smaller computational cost than the iterative EM algorithm and ML multiuser detection: the complexities of PIC and LMMSE ...
doi:10.1109/tsp.2007.893229
fatcat:ggl4jczatzgwlnj3zayod5sr2y
A Low-Complexity Blind Multiuser Receiver for Long-Code CDMA
2004
EURASIP Journal on Wireless Communications and Networking
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We propose both single-user and multiuser blind source-channel estimation algorithms by making use of an iterative estimation scheme initialized by the DRR. ...
Signal Proc., 2003) derived a blind decorrelating RAKE receiver (DRR) and channel estimation algorithm for long-code CDMA systems, and showed how it can be efficiently implemented. ...
Similar iterative receivers are known for short-code (periodic-code) CDMA systems, for example, the (parallel interference cancellation PIC) receivers, and for long-code CDMA an iterative blind receiver ...
doi:10.1155/s1687147204405040
fatcat:5yk2najadnhl5iem73g65fdwri
Turbo multiuser detection with unknown interferers
2002
IEEE Transactions on Communications
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We consider the problem of turbo multiuser detection for synchronous and asynchronous CDMA in the presence of unknown users. ...
In this paper we develop turbo multiuser detection for CDMA uplink systems and other environments in which the receiver has knowledge of the signature waveforms of onlyK ≤ K users. ...
Christian Schlegel, for his careful readings of the manuscript and insightful comments. ...
doi:10.1109/26.996076
fatcat:brz2uue2fva75gfyjb45viegeu
Iterative space-time processing for multiuser detection in multipath CDMA channels
2002
IEEE Transactions on Signal Processing
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These algorithms include iterative linear space-time multiuser detection, Cholesky iterative decorrelating decision-feedback space-time multiuser detection, multistage interference cancelling space-time ...
multiuser detection, and EM-based iterative space-time multiuser detection. ...
The EM algorithm is applied to space-time multipath asynchronous CDMA multiuser detection as follows. ...
doi:10.1109/tsp.2002.801923
fatcat:kd4g6rnj25dajpaphopljvep6m
An iterative multiuser decoder for near-capacity communications
1998
IEEE Transactions on Communications
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In addition, an optimal iterative multiuser detector is derived from iterative techniques for cross-entropy minimization. ...
The complexity of the suboptimal algorithm is approximately (O(2 K ) + O(2 )) per bit per iteration where K is the number of users and is the code constraint length. ...
Pietrobon, and the anonymous reviewers for a very thorough review and many helpful suggestions. ...
doi:10.1109/26.701309
fatcat:4aqn3md3mnfclgzex5abstv6d4
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