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多速率MC-CDMA系统盲信道估计

Blind channel estimation in multirate multi-carrier code division multiple access system
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摘要 针对多速率传输的物理层实现,通过将可变扩频长度(VSL)和多码(MC)的概念扩展到多载波码分多址(MC-CDMA)系统,分析了MC-CDMA系统的两种多速率方式,并在每个等效用户的虚拟扩频码的基础上,提出两种方式的统一数学模型.借助于统一数学模型,利用子空间方法,实现了多速率MC-CDMA系统的盲信道估计.数值仿真结果表明,该统一模型能够有效地对各种速率用户的信道进行辨识.在相同条件下,多码方式的性能优于VSL方式. In wireless communications,the data rates of diverse multimedia services vary largely.Therefore,achievaing multirate physical-layer transmission is an effective approach for wireless multimedia communications by adapting the concepts of multi-code(MC) and variable spreading length(VSL) to MC-CDMA system.Via the virtual spreading codes of effective users,a general and uniform matrix model for VSL and multicode MC-CDMA systems is built.Furthermore,the blind channel estimation of these two multirate systems is obtained with subspace method.For typical distributions of the inputs and channel noise,closed-form expressions for the channel estimation error is thrived as functions of the signal-noise ratio(SNR).Simulation results are provided to verify the validity of proposed method and also show the superiority of multicode access over VSL access.
作者 冯艳
出处 《陕西师范大学学报(自然科学版)》 CAS CSCD 北大核心 2006年第S2期97-100,共4页 Journal of Shaanxi Normal University:Natural Science Edition
关键词 多速率 盲信道估计 多载波码分多址 multirate blind channel estimation MC-CDMA
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