摘要
A new convolutionally coded direct sequence (DS) CDMA system is proposed. The outputs of a convolutional encoder modulate multiple band-limited DS-CDMA waveforms. The receiver detects and combines signals for the desired user and feeds a soft-decision Viterbi decoder. The performance of this system is compared to that of a convolutionally coded single carrier DS CDMA system with a Rake receiver. At roughly equivalent receiver complexity, results will demonstrate superior performance of the coded multicarrier system.
A new convolutionally coded direct sequence (DS) CDMA system is proposed. The outputs of a convolutional encoder modulate multiple band-limited DS-CDMA waveforms. The receiver detects and combines signals for the desired user and feeds a soft-decision Viterbi decoder. The performance of this system is compared to that of a convolutionally coded single carrier DS CDMA system with a Rake receiver. At roughly equivalent receiver complexity, results will demonstrate superior performance of the coded multicarrier system.
基金
KeyProjectofNaturalSciencefromHubeiProvincialDepartmentofEducation(2004D002)
ScientificResearchFoundationfromDepartmentofthePublicSecurity(200342-823-01)
关键词
DS-CDMA系统
码分多址
回旋码
衰退系统
频率分布
Convolutional code
Rayleigh fading
Multicarrier CDMA
Frequency diversity
Narrow-band interference