Title :
A Novel SFBC-OFDM Scheme for Doubly Selective Channels
Author :
Lu, Sili ; Narasimhan, Balachander ; Al-Dhahir, Naofal
Author_Institution :
Univ. of Texas at Dallas, Richardson, TX
fDate :
6/1/2009 12:00:00 AM
Abstract :
Effective intercarrier interference (ICI) mitigation for multiple-input-multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) requires accurate channel estimation, which is very challenging due to the large number and fast time-varying nature of the channel parameters to be estimated using scattered pilots. We present a novel space-frequency block coding OFDM (SFBC-OFDM) scheme for doubly selective channels and a reduced-complexity channel-estimation algorithm, which exploits the banded and sparse structure of the channel in the frequency and time domains, respectively. Furthermore, we design a finite-impulse-response minimum-mean-square-error (FIR-MMSE) ICI cancellation algorithm for mobile SFBC-OFDM and demonstrate its effectiveness for digital video broadcasting-handheld (DVB-H) systems.
Keywords :
MIMO communication; OFDM modulation; block codes; channel estimation; intercarrier interference; least mean squares methods; FIR-MMSE ICI cancellation algorithm; MIMO; SFBC-OFDM scheme; channel estimation; doubly selective channel; finite-impulse-response; frequency domain structure; intercarrier interference; minimum-mean-square-error; multiple-input-multiple-output orthogonal frequency-division multiplexing; space-frequency block coding; time domain structure; Alamouti scheme; Doppler effect; intercarrier interference (ICI); orthogonal frequency-division multiplexing (OFDM); space-frequency block coding (SFBC);
Journal_Title :
Vehicular Technology, IEEE Transactions on
DOI :
10.1109/TVT.2008.2006271