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本文对传统OFDM和多符号封装(MSE)-OFDM进行了系统比较.分析了频率偏移对系统性能的影响.比较在2种不同的假设下进行,即或者保持MSE-OFDM的符号长度(即子载波数)不收稿日期:2004-07-08作者简介:Y.WuFellow,IEEE,andX.WangMember,IEEEarewithCommunicationsResearchCentreCanada,CarlingAve.,Box11490,StationH,Ottawa,ONK2H8S2Canada.E-mail:yiyan.wu,xianbin.wang@crc.ca变以提高频带利用率,或者保持频带利用率(CP与数据有效传输时间之比)不变以改善系统对抗同步误差,即频率偏差的能力.在第一种降CP的MSE-OFDM情形下,由于减少了OFDM符号之间插入的CP数,频带利用率得以提高;对于后一种降FFT长度的MSE-OFDM情形,更少的子载波数显著改善了对同步误差的抵抗能力.本文提出的系统尤其适合于固定无线系统和数字用户环路(DSL).在这些应用中,由于信道环境的静止特性,可以使用很大的帧长度.文中还讨论了MSE-OFDM系统的复杂度.
This paper systematically compares the traditional OFDM and multi-symbol encapsulation (MSE) -OFDM and analyzes the effect of frequency offset on the system performance.Compared with two different assumptions, that is to say, the symbol length of MSE-OFDM Subcarriers) Received Date: 2004-07-08 About the Author: Y. WuFellow, IEEE, andX.WangMember, IEEEarewithCommunicationsResearchCentreCanada, CarlingAve., Box11490, StationH, Ottawa, ONK2H8S2Canada.E-mail: yiyan.wu, xianbin. wang@crc.ca Change the frequency of the band to improve efficiency, or keep the bandwidth utilization (CP and the effective transmission time ratio) to improve the system to counter synchronization error, that is, the ability of frequency deviation in the first kind of CPE MSE In the case of OFDM, the band utilization is improved by reducing the number of CPs inserted between OFDM symbols; for the latter case of MSE-OFDM with reduced FFT length, fewer subcarriers significantly improve the resistance to synchronization errors Ability.The system proposed in this paper is especially suitable for fixed wireless systems and digital subscriber loops (DSLs) where a large frame length can be used due to the stationary nature of the channel environment.The paper also discusses the performance of MSE-OFDM system complex .