宽带卫星通信信号的多维星座图解调方法

doi:10.7527/S1000-6893.2013.0472

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宽带卫星通信信号的多维星座图解调方法

陈昭男, 王红星, 毛忠阳, 康家方

海军航空工程学院电子信息工程系, 山东烟台 264001

收稿日期:2013-05-21 修回日期:2013-11-26 出版日期:2014-03-25 发布日期:2013-12-19
通讯作者: 王红星，Tel.：0535-6635665 E-mail：buaawhx@163.net E-mail:buaawhx@163.net
作者简介:陈昭男男，博士研究生。主要研究方向：现代通信系统，高效调制技术。Tel：0535-6635696 E-mail：chzhnan12@163.com；王红星男，博士，教授，博士生导师。主要研究方向：调制编码理论与应用、航空通信导航等。Tel：0535-6635665 E-mail：buaawhx@163.net
基金资助:
国家自然科学基金（60772056）；山东省“泰山学者”建设工程专项经费资助（ts20081130）

A Multidimensional Constellation Demodulation Method for Broadband Satellite Communication Signals

CHEH Zhaonan, WANG Hongxing, MAO Zhongyang, KANG Jiafang

Department of Electrical and Information Engineering, Naval Aeronautical and Astronautical University, Yantai 264001, China

Received:2013-05-21 Revised:2013-11-26 Online:2014-03-25 Published:2013-12-19
Supported by:
National Natural Science Foundation of China (60772056); Taishan Scholars Appropriated Foundation of Shandong Province (ts20081130)

摘要/Abstract

摘要：

高速卫星数据传输需要利用较高调制维度和较多星座点数来实现，一方面导致接收端具有较大实现复杂度，另一方面系统可靠性极易受信道非线性影响。针对以上问题，通过对多维星座图信号的解调性能进行理论分析，得到极大后验概率（MAP）解调误符号率（SER）的理论公式，在保证系统SER性能的基础上，提出了基于星座图相关的检测方法。该方法利用脉冲正交性得到接收星座点，对其进行向量相关运算得到解调数据，有效降低了解调判决过程的复杂度。针对信号经过高功率放大器（HPA）后的非线性失真问题，建立了HPA信道估计模型，利用最小二乘（LS）信道估计方法对原解调星座图进行修正，提出了基于修正星座图的解调方法。仿真结果表明，该方法在降低实现复杂度的同时，有效提高了系统抗HPA信道非线性失真的能力，可实现对宽带高速卫星通信信号的高效准确解调。

关键词: 卫星通信, 正交幅度调制, 解调, 椭圆球面波函数, 高功率放大器

Abstract:

High modulation dimension and many constellation points are needed by high rate satellite communication, which increases realization complexity of the receiver and reduces system reliability in the nonlinear channel. Aimed at the above problems, the demodulation performance of multi-dimensional constellation signals is theoretically analyzed, and the symbol error ratio (SER) expression of maximum a posteriori probability (MAP) demodulation is derived. A novel constellation correlation modulation is proposed while maintaining the SER performance. In this method, the receiver obtains constellation point by orthogonally of pulse set and each constellation point is correlated as a vector with template vectors to get the demodulated data, which effectively reduces the demodulation complexity. In order to overcome nonlinearity distortion of modulated signals after high power amplifier (HPA), a multi-dimensional revised constellation demodulation method is proposed. HPA channel is estimated by least squares (LS) method and demodulation constellation is revised on the basis of estimated HPA channel. Simulation results show that the proposed demodulation method performs better in HPA channel than traditional MAP demodulation and reduces realization complexity, which is suitable for broadband satellite communication.

Key words: satellite communication, quadrature amplitude modulation, demodulation, prolate spheroidal wave functions, high power amplifier

中图分类号:

V443
TN927.2

陈昭男, 王红星, 毛忠阳, 康家方. 宽带卫星通信信号的多维星座图解调方法[J]. 航空学报, 2014, 35(3): 828-837.

CHEH Zhaonan, WANG Hongxing, MAO Zhongyang, KANG Jiafang. A Multidimensional Constellation Demodulation Method for Broadband Satellite Communication Signals[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014, 35(3): 828-837.

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E-mail：hkxb@buaa.edu.cn

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主管单位：中国科学技术协会主办单位：中国航空学会北京航空航天大学

宽带卫星通信信号的多维星座图解调方法

A Multidimensional Constellation Demodulation Method for Broadband Satellite Communication Signals

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