This paper describes a linear interference cancellation multi user detector for synchronous DS CDMA systems under the condition that all spread spectrum code waveforms have the constant cross correlating coefficien...This paper describes a linear interference cancellation multi user detector for synchronous DS CDMA systems under the condition that all spread spectrum code waveforms have the constant cross correlating coefficients. The basic idea is to get the estimation for total multiple access interference (MAI) of all users using a reference code waveform, then subtract the total MAI from the received signal. The structure of such a detector is nearly similar to the conventional detector. The BER expression obtained in the paper shows significant performance improvement compared to the other detectors.展开更多
Two kinds of lattice-basis reduction precoding schemes based on successive interference cancellation are proposed.The successive interference cancellation(SIC) structure can be obtained by either orthogonal and a righ...Two kinds of lattice-basis reduction precoding schemes based on successive interference cancellation are proposed.The successive interference cancellation(SIC) structure can be obtained by either orthogonal and a right triangular matrix(QR) decomposition,or the Vertical Bell Labs Layered Space Time(VBLAST) algorithm which provides optimal user ordering.Moreover,the extended channel approach is applied to the proposed SIC-based schemes.Simulation results show that the proposed schemes can achieve comparable BER performance to vector precoding(VP).展开更多
文摘This paper describes a linear interference cancellation multi user detector for synchronous DS CDMA systems under the condition that all spread spectrum code waveforms have the constant cross correlating coefficients. The basic idea is to get the estimation for total multiple access interference (MAI) of all users using a reference code waveform, then subtract the total MAI from the received signal. The structure of such a detector is nearly similar to the conventional detector. The BER expression obtained in the paper shows significant performance improvement compared to the other detectors.
基金the National Natural Science Founda-tion of China (Nos. 60772100 and 60872017)the National High Technology Research and Development Program (863) of Chinal (No. 2009AA011505)
文摘Two kinds of lattice-basis reduction precoding schemes based on successive interference cancellation are proposed.The successive interference cancellation(SIC) structure can be obtained by either orthogonal and a right triangular matrix(QR) decomposition,or the Vertical Bell Labs Layered Space Time(VBLAST) algorithm which provides optimal user ordering.Moreover,the extended channel approach is applied to the proposed SIC-based schemes.Simulation results show that the proposed schemes can achieve comparable BER performance to vector precoding(VP).
