高階QAM調(diào)制下基于對(duì)數(shù)似然比門限的自適應(yīng)解調(diào)方案
[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(xué)移動(dòng)通信技術(shù)重慶市重點(diǎn)實(shí)驗(yàn)室;
【基金】:國家自然科學(xué)基金(61471076) 重慶市基礎(chǔ)與前沿研究計(jì)劃(cstc2015jcyj A40047) 長江學(xué)者和創(chuàng)新團(tuán)隊(duì)發(fā)展計(jì)劃(IRT1299) 重慶市科委重點(diǎn)實(shí)驗(yàn)室專項(xiàng)經(jīng)費(fèi)(CSTC)~~
【分類號(hào)】:TN911.3
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