ITD-DFE Based Channel Estimation and Equalization in TDS-OFDM Receivers

As an alternative to the traditional cyclic prefixed OFDM (CP-OFDM) technology, time-domain synchronous OFDM (TDS-OFDM) provides higher spectrum efficiency due to no pilot in the transmitted signal. However, the pilot-Aided channel estimation techniques in CP-OFDM cannot be applied to TDS-OFDM. In this paper, channel impulse responses are estimated in time domain based on the linear correlation between the received samples and the locally generated PN sequence. The iterative threshold detection (ITD), as well as the combination with decision feedback equalization (DFE), is proposed to improve the precision of channel estimation. It is shown by simulation that the proposed algorithm, ITD combined with DFE (ITD-DFE), performs very well even in multipath environments with long- delay and large-amplitude echoes.

[1]  Jun Wang,et al.  Iterative padding subtraction of the PN sequence for the TDS-OFDM over broadcast channels , 2005, IEEE Transactions on Consumer Electronics.

[2]  Framing structure , channel coding and modulation for digital terrestrial television , 2022 .

[3]  Wenjun Zhang,et al.  On channel estimation and equalization in TDS-OFDM based terrestrial HDTV broadcasting system , 2005, IEEE Transactions on Consumer Electronics.

[4]  Zhixing Yang,et al.  Synchronization and channel estimation for TDS-OFDM systems , 2003, 2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484).

[5]  Jian Fu,et al.  Low-Complexity Equalization for TDS-OFDM Systems Over Doubly Selective Channels , 2005, IEEE Trans. Broadcast..

[6]  Changyong Pan,et al.  Channel estimation of DMB-T , 2002, IEEE 2002 International Conference on Communications, Circuits and Systems and West Sino Expositions.