Space-time block coding over frequency selective fading channel in the downlink WCDMA system

Space-time block coding (STBC) is a promising candidate for the next generation cellular communications standard, especially in the downlink system. In the downlink WCDMA system, multiple access interference (MAI), which impairs performance of the receiver, can be eliminated by channel chip level equalization. In this paper, different schemes for STBC over frequency selective fading channels in downlink WCDMA systems are introduced. Simulation results show that the combination of channel chip equalization and STBC (symbol level as well as chip level) provides better performance.

[1]  Anja Klein,et al.  Data detection algorithms specially designed for the downlink of CDMA mobile radio systems , 1997, 1997 IEEE 47th Vehicular Technology Conference. Technology in Motion.

[2]  A. Robert Calderbank,et al.  Space-Time block codes from orthogonal designs , 1999, IEEE Trans. Inf. Theory.

[3]  S. Haykin,et al.  Adaptive Filter Theory , 1986 .

[4]  Michael D. Zoltowski,et al.  Simple MMSE equalizers for CDMA downlink to restore chip sequence: comparison to zero-forcing and RAKE , 2000, 2000 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.00CH37100).

[5]  D. Slock,et al.  Linear receivers for the DS-CDMA downlink exploiting orthogonality of spreading sequences , 1998, Conference Record of Thirty-Second Asilomar Conference on Signals, Systems and Computers (Cat. No.98CH36284).

[6]  M. Latva-aho,et al.  Multiple access interference suppression with linear chip equalizers in WCDMA downlink receivers , 1999, Seamless Interconnection for Universal Services. Global Telecommunications Conference. GLOBECOM'99. (Cat. No.99CH37042).

[7]  Siavash M. Alamouti,et al.  A simple transmit diversity technique for wireless communications , 1998, IEEE J. Sel. Areas Commun..