摘要
多径环境中传统的DS-CDMA信号接收,一般采用RAKE接收技术.本文提出一种不使用RAKE接收机的DS-CDMA接收算法:基于时频二维扩频的思想,考虑DS-CDMA发射机发射的一个扩频符号对应时间内的信号,在接收机中先将接收到的信号做一个比扩频增益N小的DFT变换,联合对多个DFT变换后的信号进行扩频解扩处理,从而恢复出发射的原始信息比特.本文对比了DS-CDMA传统的RAKE接收算法、基于时频二维扩频的DS-CDMA接收算法(2DSS)、以及Wang等提出的具有信道选择的频域解扩算法的复杂度,并就性能进行了计算机仿真验证.结果表明,在根均方时延较小信道中的性能优于传统RAKE接收算法和具有信道选择的频域解扩算法的性能.
Considering the methods of detecting DS-CDMA signal in multipath fading channels, a new method based on time-frequency two dimensional spread-spectrum is proposed in this paper. The received signals in the symbol duration are transformed into the frequency domain by Nf-point DFT where Nf is less than the processing gain N, then the signals are combined both in the frequency and time domain. The complexities of the RAKE receiver, the method proposed in the paper and the receiver with channel sounding with path selection are compared. Finally computer simulation results show that the performance of the proposed receiver is the best among the three methods in the channels which have small root mean square （r.m.s.） delay.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2006年第1期1-4,共4页
Acta Electronica Sinica
基金
国家自然科学基金(No.60272009
No.60472045
No.60572090
No.60496313)
