Conference Paper
An Iterative Decoding Technique for Cooperative STBCOFDM Systems with Multiple Carrier Frequency Offsets
DOI: 10.1109/PIMRC.2007.4394476 Conference: Personal, Indoor and Mobile Radio Communications, 2007. PIMRC 2007. IEEE 18th International Symposium on
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Conference Paper: An Efficient ICI Cancellation Method for Cooperative STBCOFDM Systems.
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ABSTRACT: In this paper, an efficient inter carrier interference (ICI) cancellation method for cooperative space time block coded orthogonal frequency division multiplexing (STBCOFDM) system is presented. In cooperative STBCOFDM system, ICI cancellation is needed because ICI due to the separated local oscillators always exists. To solve the complexity problem of matrix inversion operation in zero forcing method which shows the best performance, ICI cancellation method using sparse matrix decomposition (SMD) has been proposed. However, overall complexity is increased in proportion to the third order of required tap size which also increases in proportion to FFT size or carrier frequency offsets (CFOs). Considering implementation issue, the conventional method still has not sufficiently overcome the performance versus complexity tradeoffs. Therefore, we propose an ICI cancellation method that focuses on solving practical complexity problem of conventional method. The proposed method adaptively decides the required tap size of each sparse matrix through signal to interference and noise ratio (SINR) measurement to reduce the complexity of conventional method, and we verified that the proposed method improves the performance versus complexity tradeoffs compared with conventional method.Computational Science and Its Applications  ICCSA 2010, International Conference, Fukuoka, Japan, March 2326, 2010, Proceedings, Part III; 01/2010 
Conference Paper: On the Detection of Distributed STBC AF Cooperative OFDM Signal in the Presence of Multiple CFOs.
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ABSTRACT: This paper deals with the interference mitigation problem of the distributed space time block coded (STBC) amplifyandforward (AF) cooperative orthogonal frequency division multiplexing (OFDM) signal in the presence of carrier frequency offsets (CFO). Multiple CFOs introduce phase drift, intercarrier interference (ICI) and interblock interference (IBI) to the received signal. A joint time domain (TD) and frequency domain (FD) method is presented to recover the phase distortion and mitigate the ICI and IBI with low complexity and high performance. The TD compensation proposed in this paper removes the IBI first and then the ICI is mitigated through FD equalization (FDE) methods. For the FDE, the minimum mean square error (MMSE) equalizer has been derived which has a different noise covariance matrix from the conventional MMSE. Subblock processing is employed to reduce the computational complexity in FD equalization. Furthermore, a twopilotblock assisted channel estimation method is proposed for AF cooperative OFDM in the presence of CFOs. The biterrorrate (BER) performance evaluated via computer simulation demonstrates the effectiveness of the proposed method.Proceedings of IEEE International Conference on Communications, ICC 2010, Cape Town, South Africa, 2327 May 2010; 01/2010  [Show abstract] [Hide abstract]
ABSTRACT: This paper addresses the problem of data detection in cooperative spacetime block coded (STBC) orthogonal frequency division multiplexing (OFDM) systems in the presence of multiple carrier frequency offsets (CFO). An enhanced iterative maximumlikelihood detector (EIMLD) is proposed. This method consists of first removing intercarrier interference (ICI), and then performing iterative symbol detection and intersymbol interference reduction. Simulation results show that EIMLD significantly outperforms existing iterative methods. Comparisons with the zeroforcing and minimummean square error detectors, which require complex matrix inversion, are also carried out.IEEE Signal Processing Letters 08/2009; · 1.67 Impact Factor
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