Blind Multiple Access Interference Suppression Algorithm Based on Relaxed Subgradient Projection for DS/CDMA Systems |
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| Authors: | Xin Wei Li Zhao Cairong Zou |
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| Affiliation: | (1) Centre for Wireless Communications (CWC), Department of Electrical Engineering, University of Oulu, Linnanmaa, FIN-90571, Finland;(2) Department of Electronic Engineering, University of Pretoria, Pretoria, 0002, South Africa;(3) Department of Electrical Engineering, University of Sydney, Sydney, 2006, Australia |
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| Abstract: | A novel blind multiple access interference suppression algorithm based on relaxed parallel subgradient projection is proposed
for DS/CDMA systems. The qualification “relaxed” is manifest in two aspects: first, the new expression for updating the interference
suppression filter coefficients vector relaxes paralleled projection fields and reduces computation complexity. In addition,
the relaxation parameter in the updated process is adaptively determined to guarantee the interference suppression filter
coefficients vector falling into fields containing the optimal filter coefficients vector after several iterations. Theoretical
analysis and simulation results conclude that this algorithm has a fast convergence speed, steady interference suppression
performance, low computation and low bit error rate. |
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