基于RCPC碼和分塊傳輸?shù)男滦虷ARQ系統(tǒng)
New HARQ System Based on RCPC and Sub-packet Transmission
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摘要: 在研究Ⅱ，Ⅲ型HARQ的基礎(chǔ)上，提出了基于RCPC碼的新型HARQ，并通過仿真得出不同信噪比下的最佳分塊方案，以便使新型HARQ獲得最佳性能。新型HARQ是將F個(gè)相同的分塊穿孔后同時(shí)發(fā)送；在接收端，解穿孔后相同的分塊進(jìn)行分集合并。新型HARQ具有Ⅱ，Ⅲ型HARQ的優(yōu)點(diǎn)，當(dāng)信噪比較低時(shí)新型HARQ的通過率和平均重傳次數(shù)接近于Ⅲ型HARQ；當(dāng)信噪比較高時(shí)新型HARQ的通過率和平均重傳次數(shù)接近于Ⅱ型HARQ。對(duì)Ⅱ，Ⅲ型和新型HARQ的性能進(jìn)行理論分析和仿真，結(jié)果證明本文結(jié)論正確。
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關(guān)鍵詞:
- RCPC碼; 分塊傳輸; 碼合并; 新型HARQ系統(tǒng)
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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