基于扰码的CDMA-BLAST系统研究
An Enhanced CDMA-BLAST System Employed Scrambling Codes
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摘要: 该文提出一种新的CDMA下行链路空时编码方案，用正交扩频码区分不同用户，用扰码区分不同发射天线，由于扰码具有良好的自相关和互相关特性，可以在不牺牲码域资源的前提下，以增加少量的复杂度换取较好的链路性能。仿真结果显示，采用正交扩频码和扰码二级扩频的空时编码方案可以取得较好的链路性能。Abstract: A novel CDMA BLAST space-time code technique is proposed in this paper for the down link in a cellular CDMA system. Scrambling codes and orthogonal spreading codes are employed to identify different transmit antennas and different users, respectively. Due to good auto- and cross-correlation proprieties of the scrambling codes, the proposed scheme can obtain considerable improvement in the bit error rate performance without sacrifice of the precious orthogonal code resources.
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Huang H, Viswanathan H, Foschini G J. Multiple antennas in efficiency[J].IEEE Trans. on Wireless Communications.2002,1(3):383-[2]Winters J H. Smart antennas for wireless systems[J].IEEE Personal Communications.1998, 5(1):23-27[3]Woliansky P W, et al.. V-BLAST: An architecture for realizing very high data rates over the rich-scattering wireless channel.International Symposium on Signals, Systems and Electronics [C]. Pisa,Italy, 1998:295 -300.[4]Huang H, Viswanathan H. Multiple antennas and multiuser detection in high data rate CDMA systems, IEEE VTC00[C],Tokyo,Japan, 2000, vol. 1: 556 -560.[5]TSG Ran WG1, Spreading and modulation(FDD), 3GPP Tech Rep. TS25.213, 2000. http:∥www.3gpp.org. -
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