[摘 要] 正交頻分復(fù)用(OFDM, Orthogonal Frequency Division Multiplexing) 是一種特殊的多載波方案,它可以被看作一種調(diào)制技術(shù),也可以被當(dāng)作是一種復(fù)用技術(shù)｡選擇OFDM的一個(gè)主要原因在于該系統(tǒng)能夠很好地對(duì)抗頻率選擇性衰落或窄帶干擾｡OFDM 由于其頻譜利用率高,成本低等原因越來(lái)越受到人們的關(guān)注｡
本文簡(jiǎn)述了OFDM技術(shù)的發(fā)展及應(yīng)用，分析了OFDM系統(tǒng)的優(yōu)缺點(diǎn)，介紹了OFDM的原理以及調(diào)制解調(diào)的模型，并作為系統(tǒng)仿真的理論基礎(chǔ)。在以上工作的基礎(chǔ)上，本文采用MATLAB仿真軟件對(duì)OFDM系統(tǒng)進(jìn)行仿真。
[關(guān) 鍵 詞] 正交頻分復(fù)用 正交相移鍵控 仿真 MATLAB

The theory and simulation of orthogonal frequency division multiplexing system

[Abstract]：OFDM is a special kind of the carrier, it can be regarded as one of modulation technique, also a kind of multiplexing technology .One of the main reason to choose OFDM is that the system will be available against frequency selective fading or narrow-band interference. Because of its high frequency spectrum utilization , OFDM get attention of people increasingly.
This paper describes the development and application of OFDM technology, analyzes the advantages and disadvantages of OFDM system is introduced, and the principle of OFDM modulation and demodulation of the model, and as the theoretical basis of system simulation. Based on the above work, we use the simulation software MATLAB OFDM system is simulated.
[Key Words]：OFDM QPSK SIMULATION MATLAB