A reduced complexity channel estimation for OFDM systems with transmit diversity in mobile wireless channels

TitleA reduced complexity channel estimation for OFDM systems with transmit diversity in mobile wireless channels
Publication TypeJournal Article
Year of Publication2002
AuthorsMinn, H., D. I. Kim, and V. K. Bhargava
JournalCommunications, IEEE Transactions on
Volume50
Pagination799 -807
Date Publishedmay.
ISSN0090-6778
KeywordsBER performance, constant modulus subcarrier symbols, correlation, correlation methods, delay spread, fast Fourier transforms, FFT size, guard tones, land mobile radio, matrix inverse, matrix inversion, matrix multiplication, mean square error, mobile wireless channels, MSE, nonconstant modulus subcarrier symbols, nonsample-spaced channel paths, OFDM data symbol, OFDM modulation, OFDM systems, parameter estimation, radio transmitters, reduced complexity channel estimation, subchannel response, transmit diversity
Abstract

A reduced complexity channel estimation for OFDM systems with transmit diversity is proposed by exploiting the correlation of the adjacent subchannel responses. The sizes of the matrix inverse and the FFTs required in the channel estimation at every OFDM data symbol are reduced by half of the existing method for OFDM systems with nonconstant modulus subcarrier symbols or constant modulus subcarrier symbols with some guard tones. The complexity reduction of half FFTs size and some matrix multiplications is still achieved for constant modulus subcarrier symbols with no guard tones. The price for the complexity reduction is a slight BER degradation and for the channels with small relative delay spreads, the BER performance of the reduced complexity method becomes quite comparable to the existing method. An alternative approach for the number of significant taps required in the channel estimation is described which achieves a comparable performance to the case with the known suitable number of significant taps. A simple modification which reduces the lost leakage of the nonsample-spaced channel paths is also proposed. This modification achieves a substantial performance improvement over the existing method without any added complexity

URLhttp://dx.doi.org/10.1109/TCOMM.2002.1006561
DOI10.1109/TCOMM.2002.1006561

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