Performance Evaluation of Channel Estimation using Trigonometric Polynomial Approximation in OFDM Systems with Transmit Diversity 


Vol. 28,  No. 3, pp. 248-256, Mar.  2003


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  Abstract

Space-time coding was designed for an efficient transmit diversity technique to improve performance of wireless communication. For the transmit diversity using space-time coding, the receiver requires to estimate channel parameters corresponding to each transmit antennas. In this paper, we propose an efficient channel estimation scheme based on trigonometric polynomial approximation in OFDM systems with transmit diversity using space-time coding. The proposed scheme is more efficient than the conventional scheme in terms of the computational complexity. For QAM modulation, when the size of FFT is 128, the conventional scheme with significant tap caching of 7 requires 9852 complex multiplications for TU,HT and BU channels. But the proposed scheme requires 2560, 7680 and 3584 complex multiplications for TU, HT and BU channels, respectively. Especially, for channels with smaller Doppler frequency and delay spreads, the proposed scheme has the improved BER performance and complexity. In addition, we evaluate the performance of maximum delay spread estimation in unknown channel. The performance of the proposed scheme is investigated by computer simulation in various multi-path fading environments.

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  Cite this article

[IEEE Style]

S. Lee and H. Choi, "Performance Evaluation of Channel Estimation using Trigonometric Polynomial Approximation in OFDM Systems with Transmit Diversity," The Journal of Korean Institute of Communications and Information Sciences, vol. 28, no. 3, pp. 248-256, 2003. DOI: .

[ACM Style]

Sang-Mun Lee and Hyung-Jin Choi. 2003. Performance Evaluation of Channel Estimation using Trigonometric Polynomial Approximation in OFDM Systems with Transmit Diversity. The Journal of Korean Institute of Communications and Information Sciences, 28, 3, (2003), 248-256. DOI: .

[KICS Style]

Sang-Mun Lee and Hyung-Jin Choi, "Performance Evaluation of Channel Estimation using Trigonometric Polynomial Approximation in OFDM Systems with Transmit Diversity," The Journal of Korean Institute of Communications and Information Sciences, vol. 28, no. 3, pp. 248-256, 3. 2003.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880