基于混合arq的迭代增强分组合并

O. Rehman, N. Zivic, S. A. H. Tabatabaei
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引用次数: 4

摘要

许多广泛使用的无线网络协议,如WiMAX、UMTS和3GPP长期演进都使用混合ARQ进行错误控制。H-ARQ提高了误码率性能,减少了重传次数。如果数据包在前向纠错后仍然出错,则接收方会发出重传请求。为了减少重传,前面已经提出了不同的方法来将重传的错误包与之前的副本结合起来。本文提出了一种改进的分组合并方法,通过将当前的错误副本与前一个错误副本合并,然后进行迭代解码,来纠正错误数据包中的奇偶错误。结合方法同时使用软信息和硬信息以获得更好的性能。并与现有的几种分组组合方法进行了性能比较。该方法不仅减少了重传次数,而且在错误数保持在一定阈值内的情况下,能够以较高的概率检测出所有错误。给出了该方法成功恢复数据包的概率。最后给出了不同数据包大小下误码率、数据包接受率和重传率的仿真结果进行比较。
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Iterative enhanced packet combining over hybrid-ARQ
Many widely used wireless networking protocols, such as WiMAX, UMTS and 3GPP Long Term Evolution use Hybrid ARQ for error control. H-ARQ improves the bit error rate performance and reduces the number of retransmissions. If the packet is in error even after forward error correction, then a retransmission request is made by the receiver. In order to reduce the retransmissions, different methods to combine the retransmitted erroneous packet(s) with the previous copies have been proposed earlier. In this paper, an enhanced packet combining method is presented that corrects both the even and odd errors in an erroneous packet by combining the current erroneous copy with the previous one and thereafter performing iterative decoding. The combining method uses both soft and hard information for better performance. A performance comparison is given with certain existing packet combining methods. The proposed method not only reduces the number of retransmissions, but also detects all the errors, with a high probability as given, if the number of errors remains within a certain threshold. The probability of the success of packet recovery for the proposed method is presented. Finally, simulation results for bit error rate, packet acceptance rate and retransmission rates for different packet sizes are presented for comparison.
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