傳送分集中的頻率偏移估測

Abstract Spatial antenna diversity has been important in improving the performance of the wireless communication systems and supporting high data rate services. Many of the space-time coding schemes applied to multi-antenna systems assume that perfect synchronization to achieve the expected performance gain. However, the inaccuracy of frequency offset estimation caused by the mismatch of the oscillators between the transmitter and receiver and/or Doppler shift would degrade the performance. In this thesis we investigate the problem of frequency offset estimation in multiple-transmit-antenna systems to find out whether space diversity can provide diversity gain to frequency offset estimation or not. The performance of the maximum likelihood (ML) estimator and the Cramer-Rao lower bound (CRLB) are shown and also the asymptotic CRLB. The optimal training sequences designed based on obtaining the optimum performance are discussed.

並列關鍵字

frequency offset estimation ； diversity

參考文獻

[1] G.J. Foshini and M.J. Gans, “On limits of wireless communication in a fading environment when using multiple antennas,” Wireless Personal Communications, vol. 6, no, 3, pp.311-335, Mar. 1998

[2] I.E. Telatar, “Capacity of Multi-Antenna Gaussian Channels,” Eur. Trans. Telecom., vol. 10, pp. 585-595, Nov. 1999

[3] S.M. Alamouti, “A Simple Transmit Diversity Technique for Wireless Communications,” IEEE J. Select. Areas in Commun., vol. 16, pp. 1459-1478, Oct. 1998.

[4] D.C. Rife and R.R. Boorstyn, “Single Tone Parameter Estimation from Discrete-Time Observations,” IEEE Trans. Inform. Theory, vol. 20, pp. 591-598, Sep 1974

[5] M. Morelli and U. Mengali, “Carrier-Frequency Estimation for Transmissions over Selective Channels,” IEEE Trans. Comm., vol. 48, no. 9, pp. 1580-1589

國際替代計量

傳送分集中的頻率偏移估測

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