计算机工程与应用2011，Vol.47Issue(33)：74-77,4.DOI:10.3778/j.issn.1002-8331.2011.33.022
基于滤波器设计的快速短波扩频系统研究
Research on performance optimization in short-wave wideband system based on filter design
摘要
Abstract
In the short-wave broadband system,in order to improve the system performance and eliminate inter-symbol interference, this paper focuses on the drawback that the error rate is high when the SNR is low,and the distortion is very serious while not satisfying the sampling theory and is susceptible to the intersymbol interference and multipath noise and so on in the traditional OFDM system.The Nyquist filter and LDPC code algorithms are introduced to the OFDM spread spectrum and the MC-CDMA system.An optimal MC-CDMA spread spectrum scheme without distortion is proposed, whose core idea is to take a different treatment for the sub-carrier and the spreading code, and separately design the Nyquist filter for the transmitter and the receiver to eliminate inter-symbol interferences, then treat the signal in the ITS channel with the technologies of diversity and combine.This paper deeply studies the major parameters of the system.Theoretical analysis and simulation results show that: the diversified spread spectrum system based on the filter design can effectively improve the BER performance in low SNR,and the system reliability,and effectively suppresses the OFDM inter-symbol interferences.关键词
Nyquist滤波器/分集合并/短波宽带系统/多载波码分多址(MC-CDMA)扩频Key words
Nyquist filter/diversity and combine/short-wave broadband system/Multi Carrier-Code Division Multiple Access (MC-CDMA) spread spectrum分类
信息技术与安全科学引用本文复制引用
綦俊炜,钱晋希,赵旦峰..基于滤波器设计的快速短波扩频系统研究[J].计算机工程与应用,2011,47(33):74-77,4.基金项目
哈尔滨市科技创新专项(No.2009RFXXG029). （No.2009RFXXG029）
