A receiver scheme for the dual PN-MC padding OFDM in doubly selective channels

The inter-carrier interference (ICI) of an OFDM system introduced by the time selectiveness of a multi-path channel degrades the system performance, especially for those with high-order constellations which is often used in HDTV broadcasting. In this paper, we propose the algorithm to combat such ICI for the OFDM structure with dual PN-MC padding defined in DTMB-A. Based on the dual PN-MC structure and the assumption that within an OFDM symbol, the variation of each channel tap is approximately linear, an approach to reconstruct the circular convolution and mitigate the ICI with a low complexity, is described. The simulation shows a good performance under Rician fading channels with the bandwidth efficiency at 5 bits/s/Hz.

[1]  Philip Schniter,et al.  Low-complexity equalization of OFDM in doubly selective channels , 2004, IEEE Transactions on Signal Processing.

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

[3]  Jean-Paul M. G. Linnartz,et al.  New equalization approach for OFDM over dispersive and rapidly time varying channel , 2000, 11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525).

[4]  Yong Soo Cho,et al.  An equalization technique for orthogonal frequency-division multiplexing systems in time-variant multipath channels , 1999, IEEE Trans. Commun..

[5]  Jian Fu,et al.  A Simplified Equalization Method for Dual PN-Sequence Padding TDS-OFDM Systems , 2008, IEEE Transactions on Broadcasting.

[6]  Jean-Paul M. G. Linnartz,et al.  Robust OFDM receivers for dispersive time-varying channels: equalization and channel acquisition , 2004, IEEE Transactions on Communications.

[7]  G.B. Giannakis,et al.  Low-complexity ICI suppression for OFDM over time- and frequency-selective Rayleigh fading channels , 2002, Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002..

[8]  Yang-Seok Choi,et al.  On channel estimation and detection for multicarrier signals in fast and selective Rayleigh fading channels , 2001, IEEE Trans. Commun..

[9]  Georgios B. Giannakis,et al.  Bounding performance and suppressing intercarrier interference in wireless mobile OFDM , 2003, IEEE Trans. Commun..