摘要
在慢变信道中,差分调制OFDM接收端无需均衡。如果信道变化剧烈,尤其当信道在一帧数据周期中发生变化时,接收符号的误码率会大大增加。由于差分调制系统无导频信号,因此传统的利用导频信号或训练符号的均衡技术无法实现。该文对倒谱分析在信号处理中的应用进行了研究,提出了一种适合于手机电视/移动多媒体广播传输系统(T-MMB)信道均衡算法。该算法利用T-MMB采用差分调制的特点,采用倒谱分析的方法对信道进行均衡。虽然该算法是在最小相位信道条件下得出,但对非最小相位信道也有均衡效果。仿真结果显示,该算法具有良好的均衡效果。
Equalization methods are unnecessary for differential modulation OFDM in slowly varying channel. When the channel varies drastically, the bit error rate （BER） will be aggravated. Due to no pilot in differential modulation OFDM, the equalization methods using pilot signal can not be used in differential modulation OFDM. A channel equalization method suitable for mobile TV/mobile multimedia broadcasting systems is proposed in the paper. Cepstral technique is employed in the method to attain the channel equalization. The simulation results indicate that this method has a favorable equalization effect.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2011年第5期682-685,696,共5页
Journal of University of Electronic Science and Technology of China
