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