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针对传输信道线性时变的宽带传输信道特性,设计了一种时域同步正交频分复用(简称TDS-OFDM)的多载波调制方式。这种调制方式既适用于具有多径干扰和多普勒频移的地面数字电视广播传输信道,也适用于其它宽带数字传输系统。为了进一步提高传输效率,提出的地面数字多媒体/电视广播DMB-T传输系统还采用了最新的纠错编码和交织编码技术,在额定的8MHz带宽中,净载数据传输率可达32.511Mbps。
Aiming at the characteristics of linear transmission channel with time-varying broadband transmission, a multi-carrier modulation scheme of time-domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) is designed. This modulation method is suitable for both terrestrial digital TV broadcast transmission channels with multipath interference and Doppler shift, as well as other wideband digital transmission systems. In order to further improve the transmission efficiency, the proposed DMB-T transmission system for terrestrial digital multimedia / television broadcasting also adopts the latest error correction coding and interleaved coding technologies, and the net data transmission rate can reach 32.511 Mbps in the rated 8 MHz bandwidth.