星上多载波解调技术研究

Study of On-board Multi-carrier Demodulation

新一代具有星上处理的卫星将急剧降低地球站的复杂度,星上多载波解调(MCD)技术就是在星上分离出各个信道然后再独立解调。研究了星上多路信号即FDMA/QPSK信号的多载波技术,这是一种重要的星上处理技术,它包括频分多路信号的FFT分路算法、频偏估计、多路QPSK信号的全数字化解调算法和解调算法中的位定时恢复方法等。对主要的关键技术进行了计算机仿真。

The new generation of on-board satellites is conceived to involve a dramatic reduction in the earth station size and complexity. The operation of on-board MCD technique is to separate each individual channel and then to perform the independent demodulation. In this paper,we study on Multi-carrier Demodulation （MCD） of FDMA/QPSK signals, which is a very important on-board signal processing technique. The MCD includes such algorithms as FDMA signal FFr demultiplexing algorithm, fully digitized demodulation algorithm of FDMA/ QPSK signals, and bit-timing synchronization in MCD, etc. Computer simulation experiments on the main key techniques have been done.