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A Design Method of Pilot Subcarrier in OFDM Wireless Multimedia System
Author(s): 
Pages: 72-74
Year: Issue:  z1
Journal: VIDEO ENGINEERING

Keyword:  导频载波正交频分复用信道估计;
Abstract: 提出了一种用于OFDM无线多媒体系统的导频符号设计方法,先根据系统性能要求确定信道估计误差方差的阈值;然后根据估计的导频载波信道增益和导频载波分布计算出数据载波的信道增益,并获得总载波信道估计误差方差;再比较该方差值与设定的门限值.通过随信道变化自适应调整导频载波,在信道深衰落时增加导频载波数,信道衰落低时减小导频载波数,既可保证业务传输质量的要求,又能提高系统频谱利用率.
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