摘要
在射频通信中,大功率放大器是无线通信系统中的必要组成部分,它的非线性失真除了会造成信号带外的频谱扩展,引起临道干扰外,还会造成带内信号失真,提高误码率。因此,如何克服功放的非线性就成了通信领域的一个重要课题和研究热点。本文采用基于查找表的自适应算法,设计了自适应数字基带预失真器并进行了仿真和综合。结果表明自适应数字基带预失真方法可有效地提高功放线性度,从而提高系统性能。
When in RF Communications System, Power amplifiers are essential components in communication systems and are inherently nonlinear. The nonlinearity creates spectral growth beyond the signal bandwidth, which interferes with adjacent channels . It also causes distortions within the signal bandwidth, which increases the bit error rate at the receiver. This paper proposes an adaptive predistorter, which is composed of a look-up table that can compensate for the distortion by an HAP. as a result, the distortion can be eliminated greatly. The efficiency of amplifier is improved effectively and the performance of system is increased.
出处
《电子器件》
CAS
2009年第6期1074-1076,共3页
Chinese Journal of Electron Devices
基金
国家自然科学基金项目资助(KYZ050206007)
