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针对正交频分复用(OFDM)系统中的信道时变,基于时变信道的分段线性近似模型,提出一种改进的OFDM时变信道估计方案。该方案通过采用期望最大化(EM)迭代算法来提高符号平均信道脉冲响应的估计精度,从而提高时变信道估计的性能;此外,在迭代过程中进行带状子载波间干扰抑制,不仅进一步提高了时变信道估计的性能,而且降低了实现复杂度。理论分析和仿真结果表明,该算法以较低的复杂度代价有效提高了时变信道OFDM系统的性能。
Aiming at the time-varying channel time-varying and time-varying channel based piecewise linear approximation in orthogonal frequency division multiplexing (OFDM) system, an improved OFDM time-varying channel estimation scheme is proposed. This scheme improves the estimation accuracy of symbol average channel impulse response by using expectation maximization (EM) iterative algorithm, so as to improve the performance of time-varying channel estimation. In addition, band-shaped subcarrier interference suppression during iteration not only further improves The performance of time-varying channel estimation reduces the implementation complexity. Theoretical analysis and simulation results show that this algorithm can effectively improve the performance of time-varying channel OFDM system with lower complexity.