高阶QAM调制下基于对数似然比门限的自适应解调方案
发布时间：2019-03-26 16:08
【摘要】：现有的自适应解调方案中采用的调制星座阶数最高仅限于16,且方案分析和设计中没有考虑信道编码的译码环节。该文研究适用于高阶QAM调制的自适应解调算法,并结合无率纠错码提出一种收端速率自适应方案。收端将符号中每个比特的对数似然比绝对值与设定的解调门限值比较,大于该解调门限值的比特解调,否则删除。无率码译码码字长度固定,通过调整解调门限达到误码性能要求。在解调比特的平均互信息分析的基础上,给出不同信噪比下达到期望的译码误码性能要求的解调门限值及解调比例的计算方法。以256-QAM星座和Raptor码为例给出方案设计实例并进行仿真,仿真结果验证了理论分析的正确性和方案的有效性。
[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.
【作者单位】： 重庆邮电大学移动通信技术重庆市重点实验室;
【基金】：国家自然科学基金(61471076) 重庆市基础与前沿研究计划(cstc2015jcyj A40047) 长江学者和创新团队发展计划(IRT1299) 重庆市科委重点实验室专项经费(CSTC)~~
【分类号】：TN911.3
本文编号：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.
【作者单位】： 重庆邮电大学移动通信技术重庆市重点实验室;
【基金】：国家自然科学基金(61471076) 重庆市基础与前沿研究计划(cstc2015jcyj A40047) 长江学者和创新团队发展计划(IRT1299) 重庆市科委重点实验室专项经费(CSTC)~~
【分类号】：TN911.3
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