基于無線信道預(yù)測(cè)的自適應(yīng)調(diào)制
Adaptive Modulation Based on Predicted Wireless Channels
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摘要: 該文研究了在平坦Rayleigh衰落信道下，借助于無線信道預(yù)測(cè)對(duì)一個(gè)基于非編碼的MQAM自適應(yīng)調(diào)制進(jìn)行優(yōu)化設(shè)計(jì)的問題。主要是通過采用無偏二階估計(jì)的方法去研究一個(gè)已知的預(yù)測(cè)誤差方差對(duì)最優(yōu)化傳輸特性的影響。推導(dǎo)出基于預(yù)測(cè)的信噪比和預(yù)測(cè)誤差方差的數(shù)據(jù)速率的最優(yōu)解，以此對(duì)數(shù)據(jù)速率進(jìn)行調(diào)整，使得頻譜效率在誤比特率的約束條件下達(dá)到最大化。通過仿真給出的數(shù)值解表明它能更好地將鏈路自適應(yīng)地快速調(diào)整到信道的真實(shí)條件，提高整個(gè)系統(tǒng)的性能。Abstract: In this paper the optimum design of an adaptive modulation based on uncoded MQAM modulation assisted by wireless channel prediction for the flat Rayleigh fading chan-nel is discussed. By studying how a known prediction error variance will affect the optimized transmission properties, optimum solutions for the rate are derived based on the predicted SNR and the prediction error variance. And the data rate is adapted to maximize the spectral efficiency subject to average bit error rate constraints. The numerical results by simulations show that it adjusts the link adaptation better to the true channel conditions and improves the overall system performance.
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[1] Goldsmith A J, Varariya P. Capacity of fading channels with channel side information[J].IEEE Trans. on Information Theory.1997, 43(6):1986-1992 -
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