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不同于传统的采用固定码率编码的协作中继系统,在发送端不知道信道状态信息(channel state in formation,CSI)时,提出协作蜂窝系统下行链路中使用无限码率Raptor码及分布式空时分组码(distributed space-time block code,DSTBC)的新方案,并研究该方案有效性、可靠性和健壮性的问题。理论分析和仿真结果证明,当发送端不知道CSI时,结合应用Raptor码和DSTBC,即使在低信噪比(signal-to-noise ratio,SNR)环境中仍能降低总传输时间及能量消耗,给无线蜂窝系统带来显著的性能增益。
Different from the traditional cooperative relay system using fixed bit rate coding, when the sender does not know the channel state in formation (CSI), it is proposed to use the infinite rate Raptor code in the downlink of the cooperative cellular system and the distributed A new scheme of distributed space-time block code (DSTBC) is proposed, and the validity, reliability and robustness of the scheme are also studied. Theoretical analysis and simulation results show that when the sender does not know CSI, the combination of Raptor codes and DSTBC can reduce the total transmission time and energy consumption even in a low signal-to-noise ratio (SNR) Significant performance gain for wireless cellular systems.