Conference Paper

Joint sequential decoding and noncoherent multiuser detection for synchronous signaling over a flat fading channel

Inst. fur Elektrische Nachrichtentech., Aachen Univ. of Technol., Aachen
DOI: 10.1109/VETECS.2000.851528 Conference: Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st, Volume: 1
Source: IEEE Xplore

ABSTRACT This paper considers the problem of joint multiuser detection and
decoding of data transmitted over a frequency nonselective Rayleigh
fading channel, where the detection is performed without previous
knowledge of the channel coefficients. Both detection and decoding are
carried out jointly by means of a sequential decoder. We derive a metric
matched to the above problem which is based on the well-known Fano
(1963) metric and discuss its properties. Using computer simulation, we
evaluate the performance of a sequential decoder that uses this metric
in conjunction with the stack algorithm. Our simulation results show
that the proposed algorithm outperforms a receiver that uses optimum
multiuser detection and optimum soft decision decoding as two separate
steps, however at the cost of even larger time complexity

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    ABSTRACT: This paper investigated a reduced complexity iterative multiuser detector based on sequential sequence estimation technique for joint detection and decoding of asynchronous code division multiple access (CDMA) signals over frequency-selective fading channels. The soft-input soft-output (SISO) multiuser detector is realized by the soft-output sequential algorithm (SOSA), previously introduced for turbo equalization systems. The advantage of this scheme comes from the low complexity of the sequential algorithm, which is only linearly dependent on the number of users. Simulation results show that the iterative sequential multiuser detector can achieve a significant performance gain over the conventional single-user detector as well as the multistage interference cancellation (MIC) receiver, and that it suffers a small amount of degradation compared with the single user performance.
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