給出了采用導引符號輔助相干解調(diào)的自適應調(diào)制正交頻分復用系統(tǒng)模型，分析了導引符號輔助相干解調(diào)自適應調(diào)制正交頻分復用系統(tǒng)頻譜效率的定義和計算方法，并結(jié)合具體實例得到了數(shù)值結(jié)果。結(jié)果表明，在分析和計算頻譜效率時，必須考慮接收端非理想信道估計和系統(tǒng)開銷的影響，得到的結(jié)果才具有實際意義。
關(guān) 鍵 詞 正交頻分復用; 導引符號輔助相干解調(diào); 自適應調(diào)制; 頻譜效率

Abstract The model of pilot symbols assisted modulation adaptive modulation orfhogonal frequehcy division multiplexing system is given in Rayleigh fading。Based on this model, spectral efficiency definition and calculation are analyzed. According to bit error rate of PSAM OFDM, the numerical result is presented under specific channel model. In order to be reference for practical system design, the result shows influences of receiver non-ideal channel estimation and system overhead must be considered.
Key words orthogonal frequency