【摘要】 在多入多出的正交频分复用系统中,常采用Turbo接收以保证系统性能。在正交频分复用系统中,限幅技术是常见的峰值平均功率比抑制技术,但限幅带来的非线性失真会造成带内失真和带外辐射,从而恶化系统性能。本文提出可以利用Turho接收机的先验信息进行限幅非线性失真的迭代对消,从而在引入少量复杂度的基础上,对抗限幅带来的影响。仿真结果表明,引入限幅非线性失真迭代对消算法可以有效提高系统性能,限幅门限越低效果越明显。更多还原

【Abstract】 Multiple-input-multiple-output (MIMO) - orthogonal-frequency-division-multiplex (OFDM) system can provide wider covering area, higher data transmission speed and frequency efficiency. Turbo receiver is always applied due to the influence of the co-channel interference. Although clipping can control the high peak-to-average power ratio effectively, the non-linear distortion caused by clipping will decrease the performance. The authors apply iterative estimation and cancellation of clipping noise scheme into Turbo receiver to reduce clipping influences and improve system performance effectually with only less system complexity increase. It is shown by simulation results that system performance can be improved about 1 dB, and the performance will be better with the lower clipping threshold.更多还原