Title :
Low Complexity Adaptive Turbo Space-Frequency Equalization for Single-Carrier Multiple-Input Multiple-Output Systems
Author :
Wu, Ye ; Zhu, Xu ; Nandi, Asoke K.
Author_Institution :
Group for Signal Process., Univ. of Liverpool, Liverpool
fDate :
6/1/2008 12:00:00 AM
Abstract :
By combining single-carrier (SC) frequency domain equalization (FDE) and Turbo equalization, we propose a minimum mean square error (MMSE) based block-wise low complexity Turbo space-frequency equalization (TSFE) structure, which offers a tremendous complexity reduction over the symbol-wise TSFE and Turbo time-domain equalization (TTDE) structures. With a moderate code rate, the proposed SC TSFE significantly outperforms its Turbo OFDM (TOFDM) counterpart, at a comparable complexity. Besides, TSFE based on the least-mean-square structured channel estimation (LMS-SCE) provides a performance close to the case with perfect channel state information (CSI), at a high convergence rate.
Keywords :
MIMO communication; channel estimation; frequency-domain analysis; least mean squares methods; turbo codes; adaptive turbo space-frequency equalization; channel state information; complexity reduction; least-mean-square structured channel estimation; minimum mean square error; single-carrier frequency domain equalization; single-carrier multiple-input multiple-output systems; turbo OFDM; turbo time-domain equalization; Adaptive equalizers; Channel estimation; Decision feedback equalizers; Dispersion; Fading; Frequency domain analysis; MIMO; Maximum likelihood estimation; OFDM; Time domain analysis;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2008.070095
