Title :
Parallel-Filtering Based Equalization of OFDM over Doubly Selective Channels
Author :
Liu, Guanghui ; Li, Hongliang ; Chen, Wei ; Wang, Mingzhen ; Wang, Lin
Author_Institution :
Sch. of Electron. Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
Time selectivity of multipath channels severely degrades the performance of OFDM systems. In this paper, a piece-wise channel approximation is presented for improving the structure of the frequency-domain channel gain matrix. The proposed model is exploited to simplify the zero-forcing (ZF) equalizer as a parallel-filtering implementation with very low complexity. The linearized case of the parallel-filtering based equalizer is studied and applied to the DVB-H receiver design. The simulation indicates that the developed equalizer enforces considerably the immunity of the DVB-H receiver to the time selectivity with very little complexity increased.
Keywords :
approximation theory; channel estimation; digital video broadcasting; filtering theory; frequency division multiple access; frequency-domain analysis; matrix algebra; radio receivers; DVB-H receiver; OFDM system; ZF equalizer; doubly selective channel; frequency-domain channel gain matrix; multipath channel; orthogonal frequency-division multiplexing; parallel-filtering based equalization; piecewise channel approximation; zero-forcing equalizer; Approximation methods; Channel estimation; Complexity theory; Digital video broadcasting; Equalizers; OFDM; Time-varying channels;
Conference_Titel :
Global Telecommunications Conference (GLOBECOM 2010), 2010 IEEE
Conference_Location :
Miami, FL
Print_ISBN :
978-1-4244-5636-9
Electronic_ISBN :
1930-529X
DOI :
10.1109/GLOCOM.2010.5683698
