非线性卫星信道的迭代预失真
Iterative pre-distortion of the non-linear satellite channel
摘要：
数字视频广播-卫星-第二代（DVB-S2）是目前用于卫星广播和宽带通信的欧洲标准。它依赖于高达32振幅/相移键控（APSK）的高阶调制，以提高系统的频谱效率。不幸的是，随着调制阶数的增加，接收器变得对物理层损伤更加敏感，并且尤其对由卫星上的功率放大器和信道化滤波器引起的失真更加敏感。非线性卫星信道的预失真问题已经研究了很多年。然而，当高阶调制用于具有长记忆的非线性信道时，现有的预失真算法的性能通常变差。在本文中，我们研究了一种新的迭代法，预失真块的发送符号，以最小化发送和接收符号之间的欧几里德距离。我们还提出了近似放松的预失真器的复杂性，同时保持其性能可接受的。
英文摘要：
Digital Video Broadcasting - Satellite - Second Generation (DVB-S2) is the current European standard for satellite broadcast and broadband communications. It relies on high order modulations up to 32-amplitude/phase-shift-keying (APSK) in order to increase the system spectral efficiency. Unfortunately, as the modulation order increases, the receiver becomes more sensitive to physical layer impairments, and notably to the distortions induced by the power amplifier and the channelizing filters aboard the satellite. Pre-distortion of the non-linear satellite channel has been studied for many years. However, the performance of existing pre-distortion algorithms generally becomes poor when high-order modulations are used on a non-linear channel with a long memory. In this paper, we investigate a new iterative method that pre-distorts blocks of transmitted symbols so as to minimize the Euclidian distance between the transmitted and received symbols. We also propose approximations to relax the pre-distorter complexity while keeping its performance acceptable.
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