A FPGA-Based DS-CDMA Multiuser Demodulator Employing Adaptive Multistage Parallel Interference Cancellation
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 datatransferred 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.
CDMA interference cancellation multiuser detection FPGA
Xinhua Li Zhenyu Song ongjie Zhan Qiongzhi Wu
Space Star Technology co., Ltd, Beijing 100086, China Beijing Institute of Technology, Beijing 10008 Space Star Technology co., Ltd, Beijing 100086, China Beijing Institute of Technology,Beijing 100081 Space Star Technology co., Ltd,Beijing 100086, China Beijing Institute of Technology, Beijing 100081
国际会议
International Conference on Space Information Technology 2009(2009年第三届空间信息技术国际会议)
北京
英文
1-11
2009-11-26（万方平台首次上网日期，不代表论文的发表时间）