幀長和信道預(yù)測對(duì)自適應(yīng)調(diào)制系統(tǒng)性能的影響
Effect of Packet Duration and Channel Prediction on Performance of Adaptive Modulation System
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摘要: 該文主要分析了在自適應(yīng)調(diào)制系統(tǒng)中，幀長自適應(yīng)和信道預(yù)測對(duì)系統(tǒng)性能的影響。推導(dǎo)了信道預(yù)測和沒有信道預(yù)測的自適應(yīng)調(diào)制系統(tǒng)的頻譜效率公式，分析結(jié)果表明對(duì)于自適應(yīng)調(diào)制系統(tǒng)，信道預(yù)測的系統(tǒng)頻譜效率是最優(yōu)的，非信道預(yù)測系統(tǒng)根據(jù)信道情況選擇最優(yōu)幀長可以獲得該系統(tǒng)的最優(yōu)系統(tǒng)頻譜效率，但它是低于信道預(yù)測的頻譜效率的，而且是隨多普勒頻率的增大而逐漸減小的。Abstract: In this paper, the effect of packet duration and channel prediction is analyzed in adaptive modulation. Spectral efficiency equations are derived for both systems with and without channel prediction. Numerical results show that systems with channel prediction can get maximum spectral efficiency while systems without channel prediction but chosen optimum packet length can get suboptimum frequency efficiency, which is inversely proportional to Doppler frequency.
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