Design criteria for reduced-complexity joint multiuser detection and group decoding

The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI:10.1109/ICCS.2004.1359412

G. Corral-Briones

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Abstract

Decision feedback multiuser detection with trellis code modulation (TCM) has been proposed to increase the spectral efficiency of bandlimited multiple-access channel (MAC) [(S. Marinkovic et al., 1999), (G. Corrall-Briones et al., 2001)]. In this paper, we investigate the design criteria to achieve good tradeoffs between performance and complexity for joint multiuser detection and group decoding (MD-GD) [(G. Corrall-Briones et al., 2001), (G. Corrall-Briones and M. Hueda, 2003)]. Two approaches are considered to improve the performance: reduced state algorithms and generalized Viterbi (GV) algorithms. In channels where the main perturbation is multiple-access interference, we show that performance can be further improved increasing the number of states of the channel rather than exploiting the coding information of more users. However, if error propagation is mitigated, additional coding information significantly improves performance. Numerical results show the good performance and low complexity of the MD-GD schemes designed from the new criteria introduced in this paper

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低复杂度联合多用户检测和组解码的设计准则

为了提高带限多址信道(MAC)的频谱效率，提出了基于网格码调制(TCM)的决策反馈多用户检测方法。Marinkovic et al.， 1999)， G. Corrall-Briones et al.， 2001)。在本文中，我们研究了在联合多用户检测和组解码(MD-GD)中实现性能和复杂性之间良好权衡的设计准则[G]。Corrall-Briones et al.， 2001)， (G. Corrall-Briones and M. Hueda, 2003)。考虑了两种提高性能的方法:简化状态算法和广义Viterbi (GV)算法。在主要干扰是多址干扰的信道中，我们证明了通过增加信道状态的数量而不是利用更多用户的编码信息可以进一步提高性能。但是，如果减少了错误传播，那么额外的编码信息将显著提高性能。数值结果表明，采用新准则设计的MD-GD格式具有较好的性能和较低的复杂度

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The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.

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