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《Acta Electronica Sinica》 2017-08
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Rate Adaptive Scheme at Receiver Based on Rateless Error Correcting Codes and High Order QAM

LEI Wei-jia;SONG Hai-na;CHEN Sheng-nan;XIE Xian-zhong;Chongqing Key Laboratory of Mobile Communications Technology,Chongqing University of Posts and Telecommunications;  
The order of the modulation used in existing adaptive demodulation schemes is no higher than 16,and the decoding of channel codes is not taken into consideration in the analysis and design. In this paper,an adaptive demodulation algorithm is studied. It includes multiple demodulation modes and can be applied to higher order quadrature amplitude modulations. A rate adaptive scheme at receiver is proposed which combines this algorithm and rateless error correcting codes. The bits whose absolute values of the log-likelihood ratio are the smallest in one symbol are deleted and the number of deleted bits varies in different demodulation modes,so the reliability and the average mutual information of demodulated bits can be boosted. From the perspective of mutual information analysis,the theoretical results of the required codeword length which meet the requirements of error performance are obtained. Moreover,the selection of the demodulation mode under a decoding complexity constraint is given. A sample scheme employing 256-QAMmodulation constellations and Raptor codes is provided,and the simulation results of this sample are consistent well with those of the theoretical analysis,which confirms the effectiveness of the scheme.
【Fund】: 国家自然科学基金(No.61471076);; 重庆市基础与前沿研究计划(No.cstc2015jcyj A40047);; 长江学者和创新团队发展计划(No.IRT1299);; 重庆市教委科学技术研究项目(No.KJ1600413)
【CateGory Index】: TN911.3
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