OFDM正交 分频多工技术系利用多载波调变(multi-carrier modulation)的观念,将信号分别载于多个子载波 (sub-carriers)上同时传送,OFDM的优点包括:(1) 克服频率选择性衰落(frequency selective fading channel)及符码间之干扰(inter-symbol interf...
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...Z的立体声的控制音(pilottone),中心频率是38KHZ的左减右(left-minus-right)信号和其他的在这个上面的次载波(sub-carriers)信号。
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null sub-carriers 空闲子载波
data sub-carriers 数据子载波
Virtual Sub Carriers 虚拟子载波
virtual sub-carriers 虚拟子载波
sub-carriers estimation 子载波估计
number of sub-carriers 子载波个数
Channel delay estimation via pilot sub-carriers is used to provide accurate frame synchronization in multipath channels.
利用有限的导频信号进行信道延迟估计从而获得准确的符号同步。
But this method occupies the special sub-carriers or time slots and then reduces the system spectrum efficiency and data transmission rate.
但该方法占用专门的子载波或时隙,降低了系统的频谱利用率和信息传输速率。
The simulation results show that the bit swap algorithm rapidly and optimally reallocates the bits and power between sub-carriers for a time stationary power-line channel.
仿真分析表明,交换算法在平稳信道环境中,运算速度快且能够保证分配结果的最优性。
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