| 多速率MC-CDMA系统盲信道估计 |
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| 引用本文： | 冯艳.多速率MC-CDMA系统盲信道估计[J].陕西师范大学学报,2006(Z2). |
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| 作者姓名： | 冯艳 |
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| 作者单位： | 武警上海总队通信处 上海200000 |
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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.
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| 关 键 词： | 多速率 盲信道估计 多载波码分多址 |
Blind channel estimation in multirate multi-carrier code division multiple access system |
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| FENG Yan.Blind channel estimation in multirate multi-carrier code division multiple access system[J].Journal of Shaanxi Normal University: Nat Sci Ed,2006(Z2). |
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| Authors: | FENG Yan |
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| Abstract: | 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. |
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| Keywords: | multirate blind channel estimation MC-CDMA |
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