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arXiv 0901.1408cs.ITmath.IT
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联合信道估计、干扰抑制和译码的消息传递方法

A Message-Passing Approach for Joint Channel Estimation, Interference Mitigation and Decoding

Yan Zhu, Dongning Guo, Michael L. Honig

摘要:

信道不确定性和同信道干扰是诸如下一代蜂窝网络的无线系统设计中的两个主要挑战。本文研究了一种同时存在时变瑞利衰落和与期望信号形式相似的强同信道干扰的无线信道模型的接收机设计。假设可以通过使用导频来估计期望信号的信道系数,而没有用于干扰信号的导频可用,如在许多实际无线系统中的情况。由于干扰过程是非高斯的,因此将其视为高斯噪声通常会导致不可接受的性能。为了利用时间上的干扰和相关衰落的统计信息,提出了一种用于联合信道估计、干扰抑制和解码的迭代消息传递架构。每个消息采用高斯密度混合的形式,其中分量的数量是有限的,使得接收器的总体复杂度对于每个符号是恒定的,而不管帧和码长度。编码和未编码系统的仿真结果表明,该接收机的性能显着优于传统的接收机与线性信道估计,并在假设的衰落模型的失配是鲁棒的。

英文摘要:

Channel uncertainty and co-channel interference are two major challenges in the design of wireless systems such as future generation cellular networks. This paper studies receiver design for a wireless channel model with both time-varying Rayleigh fading and strong co-channel interference of similar form as the desired signal. It is assumed that the channel coefficients of the desired signal can be estimated through the use of pilots, whereas no pilot for the interference signal is available, as is the case in many practical wireless systems. Because the interference process is non-Gaussian, treating it as Gaussian noise generally often leads to unacceptable performance. In order to exploit the statistics of the interference and correlated fading in time, an iterative message-passing architecture is proposed for joint channel estimation, interference mitigation and decoding. Each message takes the form of a mixture of Gaussian densities where the number of components is limited so that the overall complexity of the receiver is constant per symbol regardless of the frame and code lengths. Simulation of both coded and uncoded systems shows that the receiver performs significantly better than conventional receivers with linear channel estimation, and is robust with respect to mismatch in the assumed fading model.

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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