Enhanced MMSE Channel Estimation Using Timing Error Statistics for Wireless OFDM Systems
Date
2004
Authors
Athaudage, Chandranath R
Jayalath, Anagiyaddage Dhammik
Journal Title
Journal ISSN
Volume Title
Publisher
Institute of Electrical and Electronics Engineers (IEEE Inc)
Abstract
Estimation and tracking of the frequency-selective time-varying channel response is a challenging task for wireless communication systems incorporating coherent OFDM. In pilot-symbol-assisted (PSA) OFDM systems, the minimum mean-square-error (MMSE) estimator provides the optimum performance based on the channel statistics (channel correlation function and SNR). In OFDM systems, FFT-block timing error introduces a linear phase rotation to data modulated on individual subcarriers. An MMSE channel estimator designed only using the wireless channel statistics performs only sub-optimally when sub-carrier phase rotations due to block timing errors are present. In this paper, we show that by using the block timing error statistics of the OFDM time-synchronizer the performance of the MMSE channel estimation can be significantly improved. Numerical results show that the bit-error-probability (BEP) performance degradation due to timing errors can be almost completely recovered by the proposed technique.
Description
Keywords
Keywords: Error analysis; Probability; Rayleigh fading; Synchronization; Time varying networks; Wireless telecommunication systems; Bit-error-probability (BEP); Channel estimation; Minimum mean-square-error (MMSE) estimation; Pilot carriers; Power delay spread; Tim Bit-error-probability (BEP); Channel estimation; Minimum mean-square-error (MMSE) estimation; OFDM; Pilot carriers; Power delay spread; Rayleigh fading; Time synchronization
Citation
Collections
Source
IEEE Transactions on Broadcasting
Type
Journal article