Title :
A modified precoding scheme for MIMO downlink channel with imperfect CSIT
Author :
Cao, Peng ; Kang, Guixia ; Zhang, Ningbo ; Zhang, Ping
Author_Institution :
Key Lab. of Universal Wireless Commun., Beijing Univ. of Posts & Telecommun., Beijing, China
Abstract :
In this paper, we consider the multiuser MIMO downlink channel with multiple antennas at both the base station and the users. We concentrate on the case where the transmitter has imperfect channel state information due to estimation error and feedback delay. A channel modification matrix and a scalar factor based on minimum mean square error criterion are derived to form an equivalent channel matrix which has a lower variance of error caused by imperfect estimation and feedback delay, and then used to design the precoding vectors based on maximizing the so-called signal-to-leakage-plus-noise-ratio. We present a scheme that combines co-channel interference suppression and channel modification in an appropriate way. Simulation results validate the presented scheme.
Keywords :
MIMO communication; cochannel interference; interference suppression; mean square error methods; multiuser channels; precoding; telecommunication channels; CSIT; MIMO downlink channel; channel modification matrix; channel state information; cochannel interference suppression; estimation error; feedback delay; mean square error criterion; precoding; Base stations; Channel state information; Delay estimation; Downlink; Estimation error; MIMO; Mean square error methods; Signal design; State feedback; Transmitters; MIMO; imperfect channel state information; minimum mean square error; multiuser; precoding;
Conference_Titel :
Communication Systems, 2008. ICCS 2008. 11th IEEE Singapore International Conference on
Conference_Location :
Guangzhou
Print_ISBN :
978-1-4244-2423-8
Electronic_ISBN :
978-1-4244-2424-5
DOI :
10.1109/ICCS.2008.4737304
