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Proceedings Paper

An FPGA-based DS-CDMA multiuser demodulator employing adaptive multistage parallel interference cancellation
Author(s): Xinhua Li; Zhenyu Song; Yongjie Zhan; Qiongzhi Wu
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Paper Abstract

Since the system capacity is severely limited, reducing the multiple access interfere (MAI) is necessary in the multiuser direct-sequence code division multiple access (DS-CDMA) system which is used in the telecommunication terminals data-transferred link system. In this paper, we adopt an adaptive multistage parallel interference cancellation structure in the demodulator based on the least mean square (LMS) algorithm to eliminate the MAI on the basis of overviewing various of multiuser dectection schemes. Neither a training sequence nor a pilot signal is needed in the proposed scheme, and its implementation complexity can be greatly reduced by a LMS approximate algorithm. The algorithm and its FPGA implementation is then derived. Simulation results of the proposed adaptive PIC can outperform some of the existing interference cancellation methods in AWGN channels. The hardware setup of mutiuser demodulator is described, and the experimental results based on it demonstrate that the simulation results shows large performance gains over the conventional single-user demodulator.

Paper Details

Date Published: 2 April 2010
PDF: 11 pages
Proc. SPIE 7651, International Conference on Space Information Technology 2009, 76511G (2 April 2010); doi: 10.1117/12.855172
Show Author Affiliations
Xinhua Li, Space Star Technology Co., Ltd. (China)
Beijing Institute of Technology (China)
Zhenyu Song, Space Star Technology Co., Ltd. (China)
Beijing Institute of Technology (China)
Yongjie Zhan, Space Star Technology Co., Ltd. (China)
Beijing Institute of Technology (China)
Qiongzhi Wu, Space Star Technology Co., Ltd. (China)
Beijing Institute of Technology (China)


Published in SPIE Proceedings Vol. 7651:
International Conference on Space Information Technology 2009
Xingrui Ma; Baohua Yang; Ming Li, Editor(s)

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