论文:2013,Vol:31,Issue(1):34-39
引用本文:
唐成凯, 廉保旺, 张玲玲. 卫星通信中动态神经网络预失真算法研究[J]. 西北工业大学
Tang Chengkai, Lian Baowang, Zhang Lingling. Dynamic Neural Network Based Pre-Distortion in Satellite Communication[J]. Northwestern polytechnical university

卫星通信中动态神经网络预失真算法研究
唐成凯1, 廉保旺1, 张玲玲2
1. 西北工业大学 电子信息学院, 陕西 西安 710072;
2. 西北工业大学 航海学院, 陕西 西安 710072
摘要:
随着OFDM、WCDMA等高峰均比调制方式在卫星通信中的应用,以及卫星通信的传输速度高速化,传统的功率放大器预失真技术已经不能适应下一代卫星通信。针对上述问题,提出了一种动态神经网络预失真方法。该方法通过对输入信号进行幅相分离,分别利用动态神经网络进行预失真处理,并给出了所设计预失真方法的数学推导。仿真结果表明,该方法能够有效减小计算量并提高预失真的性能,从而可以较好地消除功率放大器的非线性特性和记忆效应,比功率放大预失真方法更具有实用价值。
关键词:    卫星通信    预失真    神经网络    直接反馈   
Dynamic Neural Network Based Pre-Distortion in Satellite Communication
Tang Chengkai1, Lian Baowang1, Zhang Lingling2
1. Department of Electronics Engineering, Northwestern Polytechnical University, Xi'an 710072, China;
2. College of Marine Engineering, Northwestern Polytechnical University, Xi'an 710072, China
Abstract:
With OFDM, WCDMA and other high peak-to-average power ratio (PAPR) modulation technique ap-plied in satellite communications, and the ever-incensing transmission speed of satellite communication, traditionalpower amplifier pre-distortion technology has revealed inefficiency to meet the requirement of satellite communica-tion.Aiming at this problem, we present a dynamic neural network predistortion method.The amplitude and phaseof the input signal are separated ahead, while the proposed dynamic neural network based predistortion is processedon this basis respectively.The computational complexity reduction and the performance pre-distortion improvementare proved through mathematical derivation.Simulation results and their analysis verify preliminarily that the pro-posed method can be more effective in suppressing the power amplifier's nonlinear characteristics and the memoryeffect; compared with third-order Volterra, it is more suitable for practical applications.
Key words:    computationad complexity    computer simulation    feedback    modulation    neural networks    orthogonalfrequency division multiplexing    power amplifiers    satellite communication systems    satellites;pre-distortion   
收稿日期: 2012-05-16     修回日期:
DOI:
基金项目: 国家自然科学基金(61101102、61202394);陕西省航空科学基金(20110196004);西北工业大学研究生创业种子基金(Z2012097);陕西省自然科学基础研究计划(SJ08F12)资助
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作者简介: 唐成凯(1985-),西北工业大学博士研究生,主要从事星间链路估计和信号抗干扰技术及无线通信的研究。
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