
Publications [#330772] of David J. Brady
Papers Published
 Zvonar, Z; Brady, D, Multiuser Detection in SinglePath Fading Channels,
Ieee Transactions on Communications, vol. 42 no. 234
(January, 1994),
pp. 17291739, Institute of Electrical and Electronics Engineers (IEEE) [doi]
(last updated on 2019/11/21)
Abstract: In this paper the performance analysis of maximum likelihood sequence and decorrelating multiuser detectors is developed for the singlepath Rayleigh fading channel. The received signal in this multipointtopoint channel is additively composed of white Gaussian noise and independently faded waveforms from a finite number of asynchronous users. The optimum sequence detector consists of a bank of singleuser matched filters followed by a dynamic programming algorithm, has a demodulation complexity per symbol which is exponential in the number of users, and requires the knowledge of the system as well of the fading parameters. The decorrelating detector has a complexity which is polynomial in the number of users, and does not require knowledge of the signal amplitudes, which are assumed to vary slowly relative to the symbol rate. The singleuser error rates are presented for both detectors and compared to conventional detection and isolated transmission, and the notion of asymptotic multiuser efficiency is developed for this channel. In contrast to conventional detection, which suffers from nearfar effects due to Rayleigh fading, it is shown that the aforementioned multiuser detectors exhibit performance which rivals that of isolated transmission for sufficiently small thermal noise power. The results of this analysis are illustrated with numerical examples and indicate that the nearfar problem may be alleviated by a more sophisticated receiver design. © 1994 IEEE.
