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首页> 外文期刊>IEEE Transactions on Information Theory >Analysis and design of interleavers for iterative multiuser receivers in coded CDMA systems
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Analysis and design of interleavers for iterative multiuser receivers in coded CDMA systems

机译：编码CDMA系统中迭代多用户接收机交织器的分析与设计。

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摘要

We deal with the design of interleavers in a coded code-division multiple-access (CDMA) scenario, where at the receiver an iterative turbo-like structure to perform multiuser detection is employed. The choice of the interleavers affects both the maximum-likelihood (ML) performance and the impact of the suboptimality of the iterative receiver. First, heuristic criteria of goodness for a set of interleavers, each assigned to a given active user, are introduced and motivated. One of these criteria is based on the intersection between the equivalent codes seen after the interleavers for each user pair. The design rules are valid for any kind of channel code. In particular, when the channel code used by every user is a terminated convolutional code, a very simple design rule, in the subset of congruential interleavers, is specified. The suitability of an interleaver set to iterative decoding is also treated. The analysis leads to a design rule which is shown to have great importance on the performance of a turbo-like receiver. Numerical results assess the validity of the derived design rules by showing that, for iterative multiuser receivers and reasonable block lengths, the suitability to iterative decoding is more important than the performance optimization.
机译：我们在编码码分多址（CDMA）方案中处理交织器的设计，其中在接收器处采用迭代的类似Turbo的结构来执行多用户检测。交织器的选择既影响最大似然（ML）性能，又影响迭代接收器的次优性。首先，引入并激发了针对每个交织器的良好性的启发式标准，每个交织器分配给给定的活跃用户。这些标准之一是基于每个用户对在交织之后看到的等效代码之间的交集。设计规则对任何类型的通道代码均有效。特别地，当每个用户使用的信道码是终止的卷积码时，在同余交织器的子集中指定非常简单的设计规则。还处理了设置为迭代解码的交织器的适用性。通过分析得出了设计规则，该规则对类turbo接收器的性能非常重要。数值结果表明，对于迭代的多用户接收器和合理的块长度，迭代解码的适用性比性能优化更为重要，从而评估了导出设计规则的有效性。

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