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arXiv 1301.0935cs.ITmath.IT
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多址中继信道的多用户格型编码

Multi-user lattice coding for the multiple-access relay channel

Chung-Pi Lee, Shih-Chun Lin, Hsuan-Jung Su, H. Vincent Poor

摘要:

本文研究了多天线多址接入中继信道(MARC),在该信道中,多个用户在中继的帮助下向一个共同的目的地发送消息。在各种MARC环境中,动态解码转发(DDF)协议由于其出色的速率性能而非常有用。然而,由于缺乏良好的结构化码书,DDF在MARC中的实际应用受到了很大的限制。本文提出了两类结构化MARC码:1)一对一中继映射辅助多用户格型编码(O-MLC)和2)模和中继映射辅助多用户格型编码(MS-MLC)。前者享有更好的速率性能,而后者提供了更大的灵活性,以权衡中继映射器的复杂性和速率性能。它示出,为了接近的速率性能可实现的非结构化码本与最大似然解码,它是至关重要的是使用一个新的K级陪集解码器的结构化O-MLC,而不是在以前的作品中提出的一级解码器。然而,如果仅用一级解码器来解码O-MLC,则在高信噪比机制下仍然可以实现最佳DDF分集复用增益折衷。对于MS-MLC,通过增加模和中继映射器的复杂度,其速率性能可以接近O-MLC。最后,对于O-MLC和MS-MLC的实际实现,设计了具有线性映射器的实用短长度格码,这有助于高效的格解码。仿真结果表明,所提出的编码方案优于现有的计划在中断概率在各种信道设置。

英文摘要:

This paper considers the multi-antenna multiple access relay channel (MARC), in which multiple users transmit messages to a common destination with the assistance of a relay. In a variety of MARC settings, the dynamic decode and forward (DDF) protocol is very useful due to its outstanding rate performance. However, the lack of good structured codebooks so far hinders practical applications of DDF for MARC. In this work, two classes of structured MARC codes are proposed: 1) one-to-one relay-mapper aided multiuser lattice coding (O-MLC), and 2) modulo-sum relay-mapper aided multiuser lattice coding (MS-MLC). The former enjoys better rate performance, while the latter provides more flexibility to tradeoff between the complexity of the relay mapper and the rate performance. It is shown that, in order to approach the rate performance achievable by an unstructured codebook with maximum-likelihood decoding, it is crucial to use a new K-stage coset decoder for structured O-MLC, instead of the one-stage decoder proposed in previous works. However, if O-MLC is decoded with the one-stage decoder only, it can still achieve the optimal DDF diversity-multiplexing gain tradeoff in the high signal-to-noise ratio regime. As for MS-MLC, its rate performance can approach that of the O-MLC by increasing the complexity of the modulo-sum relay-mapper. Finally, for practical implementations of both O-MLC and MS-MLC, practical short length lattice codes with linear mappers are designed, which facilitate efficient lattice decoding. Simulation results show that the proposed coding schemes outperform existing schemes in terms of outage probabilities in a variety of channel settings.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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