关键词: 正交频分复用, 残留载波间干扰, 带状近似, 白化矩阵

Abstract:

To reduce the complexity, the existing algorithms treat the residual inter-carrier interference (ICI) as white noise,which causes a decline in system performance. Consequently, an optimal linear ICI cancellation algorithm based on whitening residual ICI and noise was proposed. Firstly, the whiten matrix is constructed to whiten the residual ICI and noise simultaneously. Then, the optimal linear ICI cancellation matrix was deduced by maximizing the achievable rate in orthogonal frequency division multiplexing (OFDM) systems, which can obtain the time diversity embedded in time variant channels combining with successive interference cancellation. Simulations show that the proposed algorithm obviates the performance loss introduced by band approximation in traditional algorithms and can apply to OFDM systems in the channel estimation accuracy at present.

Key words: orthogonal frequency division multiplexing, residual intercarrier interference, band approximation, whiten matrix