基于擾碼的CDMA-BLAST系統(tǒng)研究
An Enhanced CDMA-BLAST System Employed Scrambling Codes
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摘要: 該文提出一種新的CDMA下行鏈路空時(shí)編碼方案，用正交擴(kuò)頻碼區(qū)分不同用戶，用擾碼區(qū)分不同發(fā)射天線，由于擾碼具有良好的自相關(guān)和互相關(guān)特性，可以在不犧牲碼域資源的前提下，以增加少量的復(fù)雜度換取較好的鏈路性能。仿真結(jié)果顯示，采用正交擴(kuò)頻碼和擾碼二級(jí)擴(kuò)頻的空時(shí)編碼方案可以取得較好的鏈路性能。
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關(guān)鍵詞:
- BLAST; 空時(shí)編碼; 擾碼; 碼分多址
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. -
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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