LS碼與、Walsh碼的上行鏈路容量比較
Uplink Capacity Comparison between LS Code and Walsh Code
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摘要: 該文首先分析了多徑衰落信道下CDMA系統(tǒng)上行鏈路信道容量,文章對單用戶接收機(jī)、多用戶接收機(jī)兩種情況下的信道容量分別作了討論.對LS碼和Walsh碼的上行鏈路容量進(jìn)行了比較.通過仿真可以看出在多用戶檢測條件下,兩種擴(kuò)頻碼提供的容量相差不大,而在單用戶檢測條件下,LS碼則要大大優(yōu)于Walsh碼。
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關(guān)鍵詞:
- 零相關(guān)窗; 聯(lián)合檢測; 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]徐紹君,高巖,李道本.具有零相關(guān)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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