TDD慢衰落无线通信系统的预重传协同GBN-ARQ算法

提出一种新的适用于TDD慢衰落的TDMA无线通信系统的预重传协同GBN-ARQ算法(PC-GBN-CARQ,pre-repeat cooperative go-back-N automate repeat request)。利用TDMA的多址特性,使得数据源和中继可同时参与出错分组的重发过程,大大提高了数据分组的重发成功率;数据源在发送的每组数据分组时加入8bit的附加信息,将数据源利用TDD上下行信道相关性预测已发数据分组中哪些可能出错的结果告知中继,使中继也能像数据源那样提前重发这些可能出错的数据分组,以便提高系统的传输效率。仿真结果表明,归一化吞吐率在0.7左右,该算法较普通GBN-ARQ算法大约有5dB的信噪比增益。

Pre-repeat cooperative GBN-ARQ for TDD/TDMAbased wireless networks

An efficient pre-repeat cooperative go-back-N automatic repeat request(PC-GBN-CARQ) algorithm for slow fading TDD/TDMA-based Wireless Networks was proposed.Taking advantage of the multiple access property of TDMA,the proposed scheme enabled both the source and the relay to retransmit packets to the destination simultaneously,which could greatly increase the successful probability of the retransmission.When the source was sending a group of data packets,it also sent 8bit of attached message to tell the relay about which packets among the group would be probably error in transmission,which was the result predicted based on TDD reciprocity,so that the relay could also pre-retransmit these packets like the source does.It should be very effective to raise the transmission efficiency.Simulation results show that the proposed algorithms can get an S/N ratio gain of about 5dB compared with the conventional ones for the normal-ized throughput of 0.7.