Title :
Added pilot semi-blind channel estimation scheme for OFDM in fading channels
Author :
Ho, C.K. ; Farhang-Boroujeny, B. ; Chin, F.
Author_Institution :
Centre for Wireless Commun., Singapore, Singapore
Abstract :
An added pilot semi-blind (APSB) scheme used for channel identification of OFDM systems, which have been adopted for DAB and DVB-T, is proposed. This scheme uses pilot symbols that are added directly to the data symbols and hence does not require any additional bandwidth for its implementation. To remove the pilots, a two dimensional Wiener filter is used for the purpose of channel interpolation by using successive iterations. Although its complexity increases with additional iterations, the APSB scheme is found to compare favorably to existing blind schemes proposed for the OFDM system in terms of bit error rate and convergence
Keywords :
OFDM modulation; Wiener filters; convergence of numerical methods; digital audio broadcasting; digital video broadcasting; error statistics; fading channels; identification; interpolation; iterative methods; OFDM; added pilot semi-blind scheme; bit error rate; channel estimation; channel identification; channel interpolation; convergence; fading channels; orthogonal frequency division multiplexing; pilot symbols; successive iterations; two dimensional Wiener filter; Bandwidth; Channel estimation; Delay; Digital video broadcasting; Fading; Frequency domain analysis; Interpolation; OFDM; Transmitters; Wiener filter;
Conference_Titel :
Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-7206-9
DOI :
10.1109/GLOCOM.2001.965992
