Composite CDMA—a statistical mechanics analysis

Composite CDMA—a statistical mechanics analysis
复制标题

复合 CDMA——统计力学分析

DOI:
10.1088/1742-5468/2009/05/p05015
复制
发表时间:
2008
期刊:
Journal of Statistical Mechanics: Theory and Experiment
影响因子:
--
通讯作者:
D. Saad
D. Saad
中科院分区:
--
文献类型:
--
作者:
Jack Raymond;D. Saad

文献摘要

参考文献

被引文献

相似文献

码分多址(CDMA),其中分配给用户的扩频码包含随机元素,近来已成为CDMA研究的基石。该结构中的随机元素特别有吸引力,因为它在利用多址信道时提供了鲁棒性和灵活性,同时在传输功率方面没有做出重大牺牲。随机码产生的一些合奏,在这里,我们认为结合两个标准的范例,稀疏和密集分布的代码,在一个单一的复合代码合奏的可能性。复合代码分析包括在大系统极限下的性能的副本对称计算,以及通过复合置信传播算法对有限系统的调查。各种各样的代码进行检查,重点是高多址干扰制度。我们演示的情况下,在大尺寸的限制和有限的系统中,复合代码具有典型的性能超过稀疏和密集的代码在等效的信噪比。
Code division multiple access (CDMA) in which the spreading code assignment to users contains a random element has recently become a cornerstone of CDMA research. The random element in the construction is particularly attractive as it provides robustness and flexibility in utilizing multi-access channels, whilst not making significant sacrifices in terms of transmission power. Random codes are generated from some ensemble; here we consider the possibility of combining two standard paradigms, sparsely and densely spread codes, in a single composite code ensemble. The composite code analysis includes a replica symmetric calculation of performance in the large system limit, and investigation of finite systems through a composite belief propagation algorithm. A variety of codes are examined with a focus on the high multi-access interference regime. We demonstrate scenarios both in the large size limit and for finite systems in which the composite code has typical performance exceeding those of sparse and dense codes at equivalent signal to noise ratio.
稀耦合和密耦合的复合系统
DOI: 10.1088/1751-8113/41/32/324014
发表时间: 2008
期刊: Mathematical and Theoretical
影响因子: --
作者:
Raymond J
通讯作者: Raymond J
复合系统中的信念传播推理。
DOI: 10.1103/physreve.78.021107
发表时间: 2008
期刊: Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子: --
作者:
Mallard E
通讯作者: Mallard E
CDMA 范式中的随机性和亚稳态
DOI: 10.48550/arxiv.0711.4380
发表时间: 2007
期刊: --
影响因子: --
作者:
Raymond J
通讯作者: Raymond J