Abstract
Faced with the challenges of modern communication, high data throughput requirements, extensive research has been paid to broadband modulation. The multi-carrier modulation is one of the most important wide band modulation techniques. Orthogonal frequency division multiplexing (OFDM) is an effective blow to the broadcast channel multipath fading and high bit rate transmission multi-carrier modulation technology of wireless channels, it is widely used in modern digital television terrestrial broadcasting (DTTB) system to support performance bandwidth-efficient multimedia services with the aid of inverse fast Fourier transform and fast Fourier transform operation. Multiple-antenna transmitter and receiver technology allows several times to achieve data transmission rates and spectrum efficiency and the use of multiple transmit antennas and multiple receive antennas through spatial processing. The Digital Terrestrial Multimedia Broadcasting (DTMB) system with the multiple-antenna receiver is considered in this paper. Digital Terrestrial Multimedia Broadcasting (DTMB) has three kinds of Frame Head mode with PN420/PN595/PN945 as training sequences for the time domain synchronous OFDM (TDS-OFDM). At the receiver side with multiple antennas, Frame Head mode detection should be done. In this paper, the frame synchronization scheme is proposed for the DTMB systems with the multiple-antenna receiver. System performance studies under different channel situations are used to verify the efficiency of the proposed scheme for the DTMB systems with the multiple-antenna receiver.
Highlights
Faced with the challenges of modern communication, high data throughput requirements, extensive research has been paid to broadband modulation
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 with the aid of inverse fast Fourier transform and fast Fourier transform operations and it is extensively used in modern digital television terrestrial broadcasting (DTTB) systems to support high performance bandwidth-efficient multimedia services, such as the Digital Video Broadcasting for Terrestrial Television (DVB-T) proposed as the European digital television standard [2], and the Digital Terrestrial Multimedia Broadcasting (DTMB) [3] proposed as the digital television terrestrial broadcasting (DTTB) standard of the People’s Republic of China
When the length of the delay spread is greater than the guard interval, it significantly reduce the performance of the OFDM system [1]
Summary
Faced with the challenges of modern communication, high data throughput requirements, extensive research has been paid to broadband modulation. Long guard interval in order to cope with multipath propagation in digital terrestrial television broadcasting, may introduce a lower cost effective data transfer rate, or the long OFDM symbols can use the saved data transfer rate, but in the implementation of the complexity and long-term cost of decoding delay. The cyclic prefix (CP) is used as the Frame Head (the guard interval) and for coarse symbol synchronization to cope with multipath signals. In Chinese OFDM-based DTTB systems, instead of the cyclic prefix, time domain synchronous OFDM (TDS-OFDM) inserts pseudo-random number (PN) sequence as the guard interval, which serves for synchronization and channel estimation [3]. We consider the situation that three kinds of Frame Head modes with PN420/PN595/PN945 as training sequences are used for the TDS-OFDM-based DTTB systems. Frame Head mode detection is important and should be done before subsequent synchronization and channel estimation
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