LS码与、Walsh码的上行链路容量比较
Uplink Capacity Comparison between LS Code and Walsh Code
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摘要: 该文首先分析了多径衰落信道下CDMA系统上行链路信道容量,文章对单用户接收机、多用户接收机两种情况下的信道容量分别作了讨论.对LS码和Walsh码的上行链路容量进行了比较.通过仿真可以看出在多用户检测条件下,两种扩频码提供的容量相差不大,而在单用户检测条件下,LS码则要大大优于Walsh码。
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关键词:
- 零相关窗; 联合检测; 信道容量
Abstract: Firstly, the uplink capacity of CDMA system, in multi-path fading channels with single-user-detection and multi-user detection, is analyzed in this paper. The uplink capacity comparison between LS code and Walsh code is discussed for the above-mentioned receivers (multi-user detector, single-user detector) in multi-path fading channels. The result shows the capacities of LS code and Walsh code are approximately the same when the multi-user detector is adopted. However, the capacity of LS code is much higher than Walsh code in condition that single-user detector is applied. -
Li D B. A spread spectrum multiple access coding method with zero correlation window. Application no. PCT/CN00/00028. 2000.[2]徐绍君,高岩,李道本.具有零相关窗的通用序列.PCT/CN02/00193,2002年3月.[3]Verdu S. Spectral efficiency of CDMA with random spreading. IEEE Trans. on Info. Theory.,1999, IT-45(2): 622-640.[4]Verdu S. Capacity region of Gaussian CDMA channels: The symbol-synchronous case. in Proc.24-th Annu. Allerton Conf. Communication, Control, and Computing, University of Illinois at Urbana Champaign, Oct. 1986: 1025-1039.[5]Telatar I E. Capacity of Multi-antenna Gaussian channels. ATT-Bell Labs Murray Hill, Tech.Memo. 1995. -
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