Frame Head Mode Detection and Symbol Detection Scheme for Digital Terrestrial Multimedia Broadcasting Systems

As an effective technique for combating multipath fading and for high-bit-rate transmission over wireless channels, orthogonal frequency division multiplexing (OFDM) is extensively used in modern digital television terrestrial broadcasting (DTTB) systems to support high performance bandwidth-efficient multimedia services. Chinese digital television terrestrial broadcasting standard recommends three kinds of Frame Head mode with PN420/PN595/PN945 as training sequences for the time domain synchronous OFDM (TDS-OFDM) based Digital Terrestrial Multimedia Broadcasting (DTMB) systems. At the receiver side, Frame Head mode detection and symbol detection should be done before subsequent synchronization and channel estimation. In this paper, a Frame Head mode detection and symbol detection scheme robust to carrier frequency offset is proposed for the TDS-OFDM based DTMB systems. Performance studies under different channel situations are used to verify the efficiency of the proposed scheme.