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根据OFDM系统的特性提出了用伪导频符号进行信道的盲估计算法。与用于做信道估计的导频信号不同,PPSs传输的是有用的数据,因此提高了系统的带宽利用率,若PPSs的平均功率增加3 dB或6 dB时可有效抑制信道的加性高斯噪声。该文对信道盲估计的均方误差及其由此算法获得的信道的状态信息对无编码的OFDM系统进行解调的误比特概率进行了仿真,结果表明提出的算法是有效的并具有很好的灵活性。
According to the characteristics of OFDM system, a blind estimation algorithm of channel using pseudo-pilot symbols is proposed. Unlike pilot signals used for channel estimation, PPSs transmit useful data and therefore increase the system’s bandwidth utilization. If the average power of PPSs is increased by 3 dB or 6 dB, additive additive Gaussian noise . In this paper, the mean square error of blind channel estimation and the channel state information obtained from this algorithm are used to simulate the bit error probability of uncoded OFDM system. The results show that the proposed algorithm is effective and has good performance Flexibility.