Subspace-based blind adaptive detector for synchronous CDMA systems

Authors:
Bin Cao;Qin-Yu Zhang;Shou-Ming Wen;Dong Liang;Sheng Wang
Affiliations:
Harbin Institute of Technology, Shenzhen, Guangdong, P.R. China;Harbin Institute of Technology, Shenzhen, Guangdong, P.R. China;Harbin Institute of Technology, Shenzhen, Guangdong, P.R. China;Harbin Institute of Technology, Shenzhen, Guangdong, P.R. China;Harbin Institute of Technology, Shenzhen, Guangdong, P.R. China
Venue:
Proceedings of the 6th International Wireless Communications and Mobile Computing Conference
Year:
2010

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Abstract

A novel and robust subspace-based blind adaptive detector for synchronous CDMA systems based on oblique projection is proposed in this paper, in respect that the oblique projection can be used to extract desired signal while nulling interferences. The suggested method requires the assumption that the desired user's spreading code and noise variance of AWGN are known to the receiver rather than the assumption that all users' spreading codes are known to the receiver in conventional subspace-based detection, and this assumption can be obtained more realistic. When the noise variance of AWGN is not available, the rank-reduced form is also given. It is shown that this detector performs a perfect rejection of MAI. It is known that the subspace-based approach is robust to the near-far effect, thus the proposed scheme based on this property is immune to the near-far effect.