Improved Frame Head mode detection and symbol detection scheme for Chinese TDS-OFDM-based DTTB systems

To face the challenge of the high data throughput requirements for modern communications, extensive researches have been paid to broadband modulation. Multi-carrier modulation is one of the most important broadband modulation techniques. Orthogonal frequency division multiplexing (OFDM) is an effective multi-carrier modulation technique for combating radio channel multipath fading and for high-bit-rate transmission over wireless channels and it 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 DTTB systems. At receiver side, Frame Head mode detection and symbol detection should be done. In this paper, an improved Frame Head mode detection and symbol detection scheme is proposed. System performance studies under different channel situations are used to verify the efficiency of the proposed scheme.