高階QAM調制下基于對數似然比門限的自適應解調方案
發布時間:2019-03-26 16:08
【摘要】:現有的自適應解調方案中采用的調制星座階數最高僅限于16,且方案分析和設計中沒有考慮信道編碼的譯碼環節。該文研究適用于高階QAM調制的自適應解調算法,并結合無率糾錯碼提出一種收端速率自適應方案。收端將符號中每個比特的對數似然比絕對值與設定的解調門限值比較,大于該解調門限值的比特解調,否則刪除。無率碼譯碼碼字長度固定,通過調整解調門限達到誤碼性能要求。在解調比特的平均互信息分析的基礎上,給出不同信噪比下達到期望的譯碼誤碼性能要求的解調門限值及解調比例的計算方法。以256-QAM星座和Raptor碼為例給出方案設計實例并進行仿真,仿真結果驗證了理論分析的正確性和方案的有效性。
[Abstract]:The order of modulation constellation used in the existing adaptive demodulation schemes is only limited to 16, and the decoding link of channel coding is not considered in the scheme analysis and design. In this paper, an adaptive demodulation algorithm for high-order QAM modulation is studied, and an adaptive scheme for receiving-end rate based on rate-free error correction codes is proposed. The receiver compares the absolute value of the logarithmic likelihood ratio of each bit in the symbol with the set demodulation threshold value, which is greater than the bit demodulation of the demodulation threshold value, otherwise it is deleted. The decoding code length of the rate-free code is fixed, and the error performance is achieved by adjusting the demodulation threshold. On the basis of the analysis of the average mutual information of the demodulated bits, the demodulation threshold and the calculation method of the demodulation ratio are given to meet the desired decoding error performance requirements under different signal-to-noise ratios (SNR). Taking 256-QAM constellation and Raptor code as examples, a scheme design example is given and simulated. The simulation results verify the correctness of the theoretical analysis and the effectiveness of the scheme.
【作者單位】: 重慶郵電大學移動通信技術重慶市重點實驗室;
【基金】:國家自然科學基金(61471076) 重慶市基礎與前沿研究計劃(cstc2015jcyj A40047) 長江學者和創新團隊發展計劃(IRT1299) 重慶市科委重點實驗室專項經費(CSTC)~~
【分類號】:TN911.3
本文編號:2447709
[Abstract]:The order of modulation constellation used in the existing adaptive demodulation schemes is only limited to 16, and the decoding link of channel coding is not considered in the scheme analysis and design. In this paper, an adaptive demodulation algorithm for high-order QAM modulation is studied, and an adaptive scheme for receiving-end rate based on rate-free error correction codes is proposed. The receiver compares the absolute value of the logarithmic likelihood ratio of each bit in the symbol with the set demodulation threshold value, which is greater than the bit demodulation of the demodulation threshold value, otherwise it is deleted. The decoding code length of the rate-free code is fixed, and the error performance is achieved by adjusting the demodulation threshold. On the basis of the analysis of the average mutual information of the demodulated bits, the demodulation threshold and the calculation method of the demodulation ratio are given to meet the desired decoding error performance requirements under different signal-to-noise ratios (SNR). Taking 256-QAM constellation and Raptor code as examples, a scheme design example is given and simulated. The simulation results verify the correctness of the theoretical analysis and the effectiveness of the scheme.
【作者單位】: 重慶郵電大學移動通信技術重慶市重點實驗室;
【基金】:國家自然科學基金(61471076) 重慶市基礎與前沿研究計劃(cstc2015jcyj A40047) 長江學者和創新團隊發展計劃(IRT1299) 重慶市科委重點實驗室專項經費(CSTC)~~
【分類號】:TN911.3
【相似文獻】
相關期刊論文 前10條
1 尤明厚;陶小峰;崔琪楣;張平;;MIMO-BICM-IDD系統中改進的迭代樹搜索檢測[J];北京郵電大學學報;2009年04期
2 王東昱;張永健;;MIMO系統中基于對數似然比排序的干擾消除[J];電路與系統學報;2013年02期
3 徐昌慶;胡震宇;宋文濤;;兩種新的對數似然比簡化算法及其在LDPC碼上的應用[J];上海交通大學學報;2006年01期
4 吳曉光;張治;鄧鋼;張平;;利于LDPC碼對數似然比譯碼的自適應功率分配算法[J];北京郵電大學學報;2007年02期
5 張煒;楊虎;張爾揚;;基于近似對數似然比的數字調制信號自動識別算法[J];信號處理;2007年01期
6 盧東斌;李光球;江虹;;基于比特對數似然比GSC的MQAM性能分析[J];杭州電子科技大學學報;2006年05期
7 邢春霄;曾桂根;;基于LDPC編碼的協作HARQ對數似然比加權合并方法[J];南京郵電大學學報(自然科學版);2014年03期
8 馬丕明,袁東風,楊秀梅,吳大雷;OFDM系統中LDPC編碼調制的對數似然比譯碼[J];山東大學學報(工學版);2004年05期
9 翁靜蘭;張世慶;張鋒;;適用于WiMAX標準的LDPC碼的仿真分析[J];電視技術;2008年S1期
10 ;[J];;年期
相關會議論文 前1條
1 盧東斌;李光球;江虹;;基于比特對數似然比GSC的MQAM性能分析[A];浙江省電子學會2006年學術年會論文集[C];2006年
,本文編號:2447709
本文鏈接:http://www.malleg.cn/kejilunwen/xinxigongchenglunwen/2447709.html

