编码正交频分复用调制 COFDM
正交频分复用调制 Orthogonal Frequency Division Multiplexing ; OFDM
正交频分复用调制方式 OFDM
脉码调制复用设备 PCM multiple equipment
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.
小灵通使用TDMA(分时多址)/(时分复用)作为其接入无线网络的方法，且声讯编码以自适应差分脉冲编码调制方式调制，速率为每秒32千比特。
PHS uses TDMA/TDD for its radio channel access method, and 32 kbit/s ADPCM for its voice codec.
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.
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