摘要
首先引入了一种可以在未来无线多媒体移动通信环境中提高数据传输速率和用户平均传输容量的系统，即基于自适应调制功能的正交频分复用（OFDM）系统的框图，然后分别利用无线LAN标准802．11a和IEEE 802．15．TG3a中规定参数对采用BPSK，QPSK，16QAM，64QAM四种调制方式的OFDM传输系统在瑞利衰减信道和存在多径效应的情况下进行了仿真，并对它们的BER性能进行了比较，最后对该系统作了客观分析。
Adaptive modulation based OFDM system block is introduced and discussed, which is a promising way to increase the data rate and to achieve larger user throughputs. In this paper, adaptive modulation based BPSK,QPSK, 16QAM and 64QAM systems applied to a coded OFDM system in a Rayleigh fast fading channel environment has been investigated and the BER performance of all these modulation techniques have been compared. At the end, the advantages and disadvantages of this system to the future wireless multimedia communications are discussed.
出处
《通信对抗》
2006年第1期43-46,共4页
Communication Countermeasures
关键词
自适应
OFDM
仿真
多媒体通信
adaptive
OFDM
simulation
multimedia communication
