MC-CDMA系统迭代检测中的一种信道估计算法

A New Channel Estimation Algorithm for Iterative Detection of MC-CDMA Systems

在 DS-CDMA 系统中,联合译码的迭代多用户检测是克服多址干扰增加系统容量的有效方法。本文将多用户检测和译码相结合的迭代检测技术应用于 MC-CDMA 系统,其中,多用户检测器由串行干扰消除和其后的 MMSE滤波器组成。文中提出一种时域信道估计作为迭代初始值的频域信道估计算法,比单纯的频域信道估计方法节约导频符号数量,并且由于信道估计性能的改善,加快了迭代检测的收敛速度。

It has been proved that iterative multiuser detection with decoding is a very effective way to increase system capacity in DS-CDMA systems. Adapting this methodology to MC-CDMA, the multiuser detector is implemented as successive interference canceller with post-minimum mean squared error filtering. A new channel estimation algorithm is proposed for the iterative detection. According to the algorithm, time domain channel estimation with pilot symbols is used as the algorithm for the initial value of iteration processing. Compared with the frequency-domain-only algorithm, the proposed algorithm requires less pilot symbols with faster iteration convergence due to the better channel estimation effect.