Channel estimation for non-ideal OFDM systems

Authors:
Juan I. Montojo;Laurence B. Milstein
Affiliations:
Qualcomm Inc. San Diego, CA and Department of Electrical and Computer Engineering, University of California at San Diego, La Jolla, CA;Department of Electrical and Computer Engineering, University of California at San Diego, La Jolla, CA
Venue:
IEEE Transactions on Communications
Year:
2010

Citing 9
Cited 1

Analysis of DFT-Based Channel Estimators for OFDM

Wireless Personal Communications: An International Journal
Effects of imperfections on the performance of OFDM systems

IEEE Transactions on Communications
A comparison of pilot-aided channel estimation methods for OFDMsystems

IEEE Transactions on Signal Processing
Simplified channel estimation for OFDM systems with multiple transmit antennas

IEEE Transactions on Wireless Communications
Performance analysis of equalized OFDM systems in Rayleigh fading

IEEE Transactions on Wireless Communications
Performance analysis of channel estimation for OFDM systems with residual timing offset

IEEE Transactions on Wireless Communications
Practical approaches to channel estimation and interference suppression for OFDM-based UWB communications

IEEE Transactions on Wireless Communications
Channel estimation for OFDM systems based on comb-type pilot arrangement in frequency selective fading channels

IEEE Transactions on Consumer Electronics
Pilot tone selection for channel estimation in a mobile OFDM system

IEEE Transactions on Consumer Electronics

OFDM Error Floor Prediction in a Small-Time-Dispersion Channel

Wireless Personal Communications: An International Journal

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Abstract

Studies of channel estimation techniques for OFDM systems often assume idealized conditions such as a cyclic prefix (CP) long enough to absorb the entire channel delay spread, or perfect time and frequency synchronization at the receiver. This paper studies the impact of removing these assumptions. We characterize the mean square error (MSE) of various linear channel estimation methods, and we derive analytical expressions for the BER performance. The derivations are kept generic so that they apply to both time-division and frequency-division multiplexing of the pilot signal and the data subcarriers. The analysis is specialized to the BER performance characterization of OFDM-based UWB systems for different realistic channel estimation methods with residual time and frequency errors. The effect of inter-carrier interference (ICI) on channel estimation is shown to be small. However, inter-symbol interference (ISI) severely impacts the quality of the channel estimates and hence can yield a large (2dB) data demodulation performance degradation.