Dual-sample differential space-time coding scheme in asynchronous satellite cooperative communication system

Abstract

Focusing on asynchronization in relay communication system over satellite fading channels,a dual-sampling differential space-time orthogonal frequency division multiplex（D-OFDM2）coding scheme was proposed.The proposed scheme constructed a dual-sampling method at the receiver based on the D-OFDM coding with delay tolerance when the satellite channel condition was unknown.The method added another sample to the current main lobe interval and equal gain merge the two sampling results.Comparing with the traditional scheme when the fractional delay is present,the D-OFDM2 scheme can obtain higher signal-to-noise ratio than single sampling method,and improves the system error performance.

Keywords

• satellite communication
• asynchronous cooperative communication
• distributed differential space-time coding
• dual-sampling