本文研究了自适应正交多载波频分复用（AOFDM）中根据估计出的信道特性选择调制方式的问题。
The problem of how to choose the constellation size based on the estimated channel qualities in AOFDM systems is addressed in this paper.
正交频分复用调制（OFDM）是一种信道利用率很高的调制方式，具有良好的抗衰落能力，可实现并行传送。
OFDM is a modulation method which was often used in the channels. It has better capability against the fading and can realized parallel transmission.
提出利用正交频分复用(OFDM)多载波调制方式代替单载波调制方式对信息进行处理。
The OFDM (Orthogonal Frequency Division Multiplexing) multi-carrier modulation is used to process messages instead of the traditional single carrier modulation.
调制方式和多址接入的灵活性是正交频分复用（OFDM）技术的一大优点。
One of the advantages of OFDM is the flexibility concerning modulation and multiple access techniques.
在DVB系统中卫星传输采用QPSK，有线传输采用QAM方式，地面传输采用COFDM(编码正交频分复用)方式。
In DVB satellite transmission system used QPSK, using QAM cable transmission, terrestrial transmission using COFDM (coded orthogonal frequency division multiplexing) way.
提出了OFDM(正交频分复用)利用FFT(傅里叶变换)实时同步方式的方案，在多径环境下具有有良好的特性。
This paper proposes a scheme for temporary time locking by using FFT (fast Fourier transformer) in OFDM (orthogonal frequency division multiplexing). The OFDM has a good BER in multipath.
提出了OFDM(正交频分复用)利用FFT(傅里叶变换)实时同步方式的方案，在多径环境下具有有良好的特性。
This paper proposes a scheme for temporary time locking by using FFT (fast Fourier transformer) in OFDM (orthogonal frequency division multiplexing). The OFDM has a good BER in multipath.
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