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由于传统块交织方法是对单个正交频分复用(orthogonal frequency division multiplex,OFDM)信号进行块交织,所产生的候选信号间存在很大的相关性,在一定程度上影响了系统峰均功率比(peak-to-average power ratio,PAPR)性能的改善。针对传统块交织方法的这一局限性,提出了降低OFDM系统PAPR的时频联合块交织方法及其次优化方法。该方法将块交织扩展到一个时间片内的多个OFDM信号之间,增加了产生候选信号的自由度,降低了候选信号间的相关性。仿真结果表明,与传统块交织方法相比,在计算复杂度相同的情况下,所提出的时频联合块交织方法可以获得更优的PAPR性能。
Because the traditional block interleaving method performs block interleaving on a single orthogonal frequency division multiplex (OFDM) signal, there is a great correlation between the candidate signals generated, which affects the system peak-to-average power to a certain extent (Peak-to-average power ratio, PAPR) performance improvement. Aiming at the limitation of traditional block interleaving method, a time-frequency joint block interleaving method and a second optimizing method for reducing PAPR of OFDM system are proposed. This method extends the block interleaving among multiple OFDM signals in a time slice, increases the degree of freedom for generating candidate signals and reduces the correlation between candidate signals. The simulation results show that compared with the traditional block interleaving method, the PAPR performance of the proposed time-frequency joint block interleaving method can be improved under the same computational complexity.