Efficient Tracking and Feedback of DL-Eigenbeams in WCDMA

A tracking solution to the downlink eigenbeamforming in WCD MA is presented. To this end, we propose a distributed implementation of the eigenspace/-beam track ing at the UE and BS, respectively. Moreover, the specific nature of the deployed tracking scheme offers a adva ntageous feedback signalling. The proposed performance measure is given by the ratio of the power for the user of interest and the total TX power of the relevant base station which is required to obtain a certain r aw bit error ratio for the user of interest.

[1]  Jar-Ferr Yang,et al.  Adaptive eigensubspace algorithms for direction or frequency estimation and tracking , 1988, IEEE Trans. Acoust. Speech Signal Process..

[2]  Bin Yang,et al.  Projection approximation subspace tracking , 1995, IEEE Trans. Signal Process..

[3]  M. Raitola,et al.  Transmission diversity in wideband CDMA , 1999, 1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363).

[4]  Josef A. Nossek,et al.  Comparison of two DOA tracking implementations for SDMA , 2000, 11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525).

[5]  Josef A. Nossek,et al.  Space-time eigenRAKE and downlink eigenibeamformer: exploiting long-term and short-term channel properties in WCDMA , 2000, Globecom '00 - IEEE. Global Telecommunications Conference. Conference Record (Cat. No.00CH37137).

[6]  Christopher Brunner.  Efficient Space-time Processing Schemes for WCDMA , 2000 .

[7]  Esa Tapani Tiirola,et al.  Performance evaluation of fixed-beam beamforming in WCDMA downlink , 2000, VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026).

[8]  Wolfgang Utschick.  Tracking of signal subspace projectors , 2002, IEEE Trans. Signal Process..