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提出一种在非理想信道状态信息条件下,以平均误比特率为目标的正交频分复用(OFDM)比特分配算法。该算法对子信道当前频率响应值进行估计,估计值经延时后反馈至发送端,并以此作为自适应比特分配的依据。仿真结果表明,当信道估计器的均方误差小于-15dB时,信道估计误差对自适应OFDM系统的性能影响不大。采用多个信道估计值来确定比特分配可以减小信道信息延时对系统性能的影响,有效提高系统性能。
This paper proposes an OFDM (Orthogonal Frequency Division Multiplexing) bit allocation algorithm with average bit error rate (BER) under non-ideal channel state information. The algorithm estimates the current frequency response of the subchannel, and the estimated value is fed back to the sender after the delay, which is used as the basis for adaptive bit allocation. The simulation results show that when the mean square error of channel estimator is less than -15dB, the channel estimation error has little effect on the performance of adaptive OFDM system. Using multiple channel estimates to determine bit allocation can reduce the impact of channel information delay on system performance and improve system performance.