摘要：为了降低OFDM信号的峰均功率比(PAPR),设计了一种分段线性压扩变换。对小幅度通过数乘变换进行线性放大,而对大幅度先利用数乘变换进行线性缩小,再对缩小后的幅度进行等量放大。得到的压扩变换是分段线性且连续的,用低复杂度的线性运算抑制峰均比,同时用分段的方法减小压扩对系统性能的影响。理论分析和仿真表明,通过数乘因子和增量数值的选取,可以在PAPR抑制和系统误码率性能上取得折中。相比于已有的线性和非线性压扩变换,改善了发送信号的功率谱密度特性。

摘要：In order to exploit the capability of the peak-to-average power ratio（PAPR）reduction afforded by the partial transmit sequences （PTS）approach in orthogonal frequency division multiplexing（OFDM）systems, subblock partition schemes for the PTS approach are studied. The motivation is to establish the relationship between the subblock partition and the capability of PAPR reduction through the periodic autocorrelation functions （ACFs）of partial transmit sequences and the periodic cross-correlation functions（CCFs）of signal *** Q represent the variation of the square magnitudes of *** is found that the lower the Q-value is, the better PAPR performance can be achieved, which is introduced as a design criterion for subblock *** on this criterion, four common partition methods are compared and an efficient partition strategy is proposed. It is shown that structured partition schemes with low computational complexity have a large Q-value, leading to a poor PAPR *** new strategy can be regarded as a trade-off between PAPR performance and computational *** simulation results show that the strategy can achieve an optimal performance with a relatively low complexity and, moreover,does not increase the amount of side information.