基于RCPC码和分块传输的新型HARQ系统
New HARQ System Based on RCPC and Sub-packet Transmission
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摘要: 在研究Ⅱ，Ⅲ型HARQ的基础上，提出了基于RCPC码的新型HARQ，并通过仿真得出不同信噪比下的最佳分块方案，以便使新型HARQ获得最佳性能。新型HARQ是将F个相同的分块穿孔后同时发送；在接收端，解穿孔后相同的分块进行分集合并。新型HARQ具有Ⅱ，Ⅲ型HARQ的优点，当信噪比较低时新型HARQ的通过率和平均重传次数接近于Ⅲ型HARQ；当信噪比较高时新型HARQ的通过率和平均重传次数接近于Ⅱ型HARQ。对Ⅱ，Ⅲ型和新型HARQ的性能进行理论分析和仿真，结果证明本文结论正确。Abstract: Based on the type-Ⅱand type-Ⅲ Hybrid Automatic Repeat reQuest (HARQ) system and Rata Compatible Punctured Convolutional (RCPC) code, a new HARQ system is proposed in which F sub-packets could be transmitted in one data packet, at receiver the same F sub-packets are combined with each other to form a reliable packet equal to the punctured combined sequence after F retransmission. The optimal number of repeat sub-packets is obtained to improve the performance of new HARQ system. The new HARQ system has the advantages of type-Ⅱand type-Ⅲ HARQ system, When the type-ⅡHARQ has higher throughput than the type-Ⅲ HARQ at higher Signal to Noise Ratio (SNR), the throughput and the retransmission times of the new system is close to type-Ⅱ HARQ. The new HARQ system spares the redundancy bits, whereas the type-Ⅲ HARQ retransmits too much redundancy at high SNR. On the other hand when the type-Ⅲ HARQ has higher throughput than the type-ⅡHARQ at lower SNR, the throughput and average retransmission times are close to that of the type-Ⅲ HARQ. Unlike the too much retransmission times of type-ⅡHARQ in the low SNR, the new HARQ spare the number of retransmission times.
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