关键词: MC-CDMA系统, 自适应并行次梯度投影, 多址干扰抑制

Abstract: To suppress multiple access interference in MC-CDMA system，an algorithm based on adaptive parallel subgradient projection has been proposed.Stochastic property convex set which contains the optimal interference suppression filter coefficients is established by the receiving signal model firstly.Then parallel subgradient projection is adopted to convert projection onto convex sets to projection into multiple closed halfspaces.Finally，the updated interference suppression filter coefficients vector is projected onto the constrained set.Theoretical analysis and simulation results conclude that this algorithm has fast convergence，steady interference suppression performance，and exhibits lower bit error rate and higher robustness in different noise intensity.

Key words: MC-CDMA system, adaptive parallel subgradient projection, multiple access interference suppression