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本文探讨了V-BLAST系统在总发射功率受限和一定目标误码率要求的前提下,基于自适应调制时间块的比特、功率分配问题,分析和比较了系统在采用不同串行干扰抵消顺序时的抗信道时变性能和抗错误传播性能,找出了在BER和速率两方面性能最优的串行干扰抵消顺序。针对错误传播对系统BER性能的冲击,提出了一种新的基于错误传播补偿的V-BLAST自适应比特、功率分配方案。仿真结果表明,该方案能显著提高系统在时变信道下的BER性能,有效增大自适应调制块长度,减小反馈开销。
This paper discusses the V-BLAST system under the premise of limited total transmit power and a certain target BER, based on the adaptive modulation of the time block bits, power distribution problems, analysis and comparison of the system using different serial interference cancellation order Time-varying anti-channel performance and anti-error propagation performance, to find the best performance in both BER and rate of serial interference cancellation order. Aiming at the impact of error propagation on BER performance of the system, a new V-BLAST adaptive bit and power allocation scheme based on error propagation compensation is proposed. The simulation results show that this scheme can significantly improve the BER performance of the system under time-varying channel, effectively increase the length of the adaptive modulation block and reduce the feedback overhead.