Title :
Iterative frequency domain equalization for single-carrier wideband MIMO channels
Author :
Giivensen, Gokhan M ; Yilmaz, A. Özgür
Author_Institution :
Dept. of Electr. & Electron. Eng., Middle East Tech. Univ., Ankara, Turkey
Abstract :
Single carrier frequency domain equalization (SC-FDE) is receiving considerable attention recently due to its comparable complexity and performance with OFDM. In this paper, an iterative SC-FDE with decision feedback in frequency domain is proposed for wideband multiple-input multiple-output (MIMO) channels and more general multipath vector channels as a generalization of previous works considering FDE with decision feedback for single-input single-output (SISO) systems. The proposed detector is based on iterative forward and backward filtering followed by a MIMO multi-stream detector that uses a priori log-likelihood ratios (LLR) of coded symbols. Forward and feedback filters are jointly optimized according to the minimum mean square error (MMSE) criterion to minimize both self inter-symbol-interference (ISI) and interference from other streams transmitted at different antennas. It has been observed that the proposed structure exploits the multi-path diversity sources of the channel effectively and a performance very close to MIMO-OFDM outage probability can be achieved. Therefore, our proposed iterative SC-FDE technique for MIMO wideband channels can be viewed as a strong alternative to MIMO-OFDM schemes with similar complexity.
Keywords :
MIMO communication; OFDM modulation; communication complexity; filtering theory; iterative methods; radiofrequency interference; MIMO multi-stream detector; MIMO-OFDM; OFDM; complexity; inter- symbol-interference; iterative SC-FDE technique; iterative backward filtering; iterative forward filtering; iterative frequency domain equalization; log-likelihood ratios; minimum mean square error; multiple-input multiple-output channels; single-carrier wideband MIMO channels; single-input single-output systems; Detectors; Feedback; Filtering; Filters; Frequency domain analysis; Intersymbol interference; MIMO; Mean square error methods; OFDM; Wideband;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2009 IEEE 20th International Symposium on
Conference_Location :
Tokyo
Print_ISBN :
978-1-4244-5122-7
Electronic_ISBN :
978-1-4244-5123-4
DOI :
10.1109/PIMRC.2009.5450232