一种卫星信道下高效QOTDM传输方法

doi:10.3969/j.issn.1001-2400.2017.01.031

Abstract

Abstract:

An efficient Quasi-orthogonal time division multiplexing (QOTDM) transmission is proposed for the satellite mobile channels. High order modulation is used in this method to resist the nonlinear mobile satellite channel. The spectral gap of sample points is eliminated by multiple rate conversion at the transmitter in order to improve the spectral efficiency. At the receiver, cyclic is constructed by channel information and local PN sequence, and a frequency domain equalization algorithm based on the block is presented. Theoretical analysis shows that this frequency domain equalization method can use the energy of the multipath to suppress the noise and the interference between the forward and backward sample points can be eliminated in the meantime. Compared with the traditional frequency domain equalization based on the cyclic prefix, the spectral utilization and data transmission efficiency are improved. It is shown by the Monte Carlo simulation that the signal-to-noise ratio of 5dB or so for the SER of 10^-3 can be achieved by the scheme proposed compared with the OFDM in the time-varying Rician channels.

Key words: quasi-orthogonal time division multiplexed, orthogonal frequency division multiplexed, multiple rate conversion, frequency domain equalization

DUAN Zhenzhen;TIAN Bin;YI Kechu;LI Yunhua. Efficient QOTDM transmission method for the satellite channel[J].Journal of Xidian University, 2017, 44(1): 176-181.

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Efficient QOTDM transmission method for the satellite channel

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