Iterative Channel Estimation Using Virtual Pilot Signals for MIMO-OFDM Systems

Title
Iterative Channel Estimation Using Virtual Pilot Signals for MIMO-OFDM Systems
Authors
최준원
Keywords
Channel estimation; decision directed channel estimation; iterative detection and decoding; joint channel estimation and detection; multi-input multi-output; orthogonal frequency division multiplexing; MIMO; OFDM
Issue Date
2015-06
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation
IEEE TRANSACTIONS ON SIGNAL PROCESSING, v. 63, NO 12, Page. 3032-3045
Abstract
The number of transmit and receive antennas in multi-input multi-output (MIMO) systems is increasing rapidly to enhance the throughput and reliability of next-generation wireless systems. Benefits of large size MIMO systems, however, can be realized only when the quality of estimated channels is ensured at the transmitter and receiver side alike. In this paper, we introduce a new decision-directed channel estimation technique dealing with pilot shortage in the MIMO-OFDM systems. The proposed channel estimator uses soft symbol decisions obtained by iterative detection and decoding (IDD) scheme to enhance the quality of channel estimate. Using the soft information from the decoders, the proposed channel estimator selects reliable data tones, subtracts interstream interferences, and performs re-estimation of the channels. We analyze the optimal data tone selection criterion, which accounts for the reliability of symbol decisions and correlation of channels between the data tones and pilot tones. From numerical simulations, we show that the proposed channel estimator achieves considerable improvement in system performance over the conventional channel estimators in realistic MIMO-OFDM scenarios.
URI
Cerium doped copper/ZSM-5 catalysts used for the selective catalytic reduction of nitrogen oxide with ammoniahttp://hdl.handle.net/20.500.11754/25583http://ieeexplore.ieee.org/document/7067422/
ISSN
1053-587X; 1941-0476
DOI
http://dx.doi.org/10.1109/TSP.2015.2416684
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRICAL AND BIOMEDICAL ENGINEERING(전기·생체공학부) > Articles
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