基于64-QAM的星座圖重排高級(jí)混合ARQ技術(shù)
Advanced Hybrid ARQ Technique Employing a Signal Constellation Rearrangement Based on 64-QAM
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摘要: 本文介紹了一種適用于QAM調(diào)制的混合ARQ(HARQ)技術(shù)，該技術(shù)通過星座圖重排，降低了多級(jí)調(diào)制造成的比特之間可靠性的差異，能夠顯著提高HARQ的性能。在此基礎(chǔ)上針對(duì)64-QAM提出了一種新的四星座圖重排方案，與原有的六星座圖重排方案相比，新方案在降低復(fù)雜度的同時(shí)能夠進(jìn)一步提高HARQ的性能。
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關(guān)鍵詞:
- 混合自動(dòng)重傳請(qǐng)求;M-QAM;Turbo 編碼;HSDPA
Abstract: An advanced Hybrid ARQ (HARQ) technique applicable to QAM is presented in this paper, which employs signal constellation rearrangement to average the variations in bit reliabilities caused by QAM signal constellation. The presented scheme employs 4 constellation mapping rules for 64-QAM, and can achieve a noticeable gain in HARQ performance as well as a reduction in complexity compared to the existing constellation rearrangement scheme. -
Wengerter C H, von Elbwart A G E. Advanced hybrid ARQ technique employing a signal constellation rearrangement. VTC 2002-Fall，vol.4：2002-2006.[2]3GPP TS 25.212 v5.3.0(2002-12). Multiplexing and channel coding(FDD).[3]Panasonic, Enhanced HARQ method with signal constellation[4]rearrangement. 3GPP TSG RAN WG1, March 2001.[5]3GPP TR 25.848 v4.0.0 (2001-03).Physical layer aspects of[6]UTRA High Speed Downlink Packet Access.[7]Gu X Y, Li W Y, Niu K, et al..A universal efficient soft output algorithm for M-QAM. Demapper, Proceedings of ICCC'2004: 880-885. -
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