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

Abstract

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

CLC Number:

V443
TN927.2

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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A Multidimensional Constellation Demodulation Method for Broadband Satellite Communication Signals

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