arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1907.09593cs.ITmath.IT
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基于低代价高斯近似的迭代多用户检测可扩展速率域

Achievable Rate Region for Iterative Multi-User Detection via Low-cost Gaussian Approximation

Xiaojie Wang, Chulong Liang, Li Ping, Stephan ten Brink

摘要:

本文建立了一个多用户外信息传输(EXIT)图面积定理,适用于多址信道(MAC)中的一种特殊形式的叠加编码--时分多址(IDMA)方案。提出了一种基于高斯近似的低代价多用户检测算法。研究了基于遗传算法的多用户检测算法在迭代过程中均方误差的演化规律。我们表明,K维元组形成的MSE的K个用户构成一个保守的向量场。可达速率是这个保守场的势函数,因此它是沿着场中任何路径的积分,积分值仅由两个路径终端确定。通过匹配EXIT类型函数,可以在MSE字段中找到给定积分路径的优化代码。上述发现意味着:i)低成本的基于GA的MUD可以提供接近容量的性能; ii)可以独立于MSE字段中的积分路径来实现总速率容量(区域);以及iii)积分路径可以是代码设计的额外自由度。

英文摘要:

We establish a multi-user extrinsic information transfer (EXIT) chart area theorem for the interleave-division multiple-access (IDMA) scheme, a special form of superposition coding, in multiple access channels (MACs). A low-cost multi-user detection (MUD) based on the Gaussian approximation (GA) is assumed. The evolution of mean-square errors (MSE) of the GA-based MUD during iterative processing is studied. We show that the K-dimensional tuples formed by the MSEs of K users constitute a conservative vector field. The achievable rate is a potential function of this conservative field, so it is the integral along any path in the field with value of the integral solely determined by the two path terminals. Optimized codes can be found given the integration paths in the MSE fields by matching EXIT type functions. The above findings imply that i) low-cost GA-based MUD can provide near capacity performance; ii) the sum-rate capacity (region) can be achieved independently of the integration path in the MSE fields; and iii) the integration path can be an extra degree of freedom for code design.

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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