Publica
Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. CSI compression and feedback for network MIMO
 Institute of Electrical and Electronics Engineers IEEE; IEEE Vehicular Technology Society VTS: IEEE 81st Vehicular Technology Conference, VTC Spring 2015. Proceedings. Vol.2 : Glasgow, Scotland, United Kingdom, 11  14 May 2015 Piscataway, NJ: IEEE, 2015 ISBN: 9781479980895 ISBN: 9781479980888 ISBN: 9781479980871 pp.985989 
 Vehicular Technology Conference (VTC Spring) <81, 2015, Glasgow> 

 English 
 Conference Paper 
 Fraunhofer HHI () 
Abstract
We consider the downlink of a multicell system where base stations and users are equipped with multiple antennas. Therein, a cluster of base stations employ joint transmission with linear zeroforcing beamforming based on compressed channel state information (CSI) feedback. For propagation we assume a realistic 3D channel model including antenna patterns. We discuss in detail a novel compression algorithm exploiting the spatial and frequency domain and also present a feedback data format. We evaluate the proposed compression algorithm in the presence of channel estimation error in terms of throughput and feedback rate and compare it with the perfect CSI case. The proposed algorithm and feedback scheme is shown to reduce the feedback rate to less than 1 % of uncompressed feedback and at the same time increasing the sum throughput significantly.