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:
影响因子:
--
通讯作者:
D. Saad
中科院分区:
文献类型:
--
作者:
Jack Raymond;D. Saad
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.
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
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
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