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1. (WO2018100226) TRANSMISSION SCHEME AND FEEDBACK MECHANISM FOR TRANSMITTERS WITH CONSTRAINED RF CHAINS

Pub. No.:    WO/2018/100226    International Application No.:    PCT/FI2016/050839
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Thu Dec 01 00:59:59 CET 2016
IPC: H04B 7/0417
H04B 7/06
H04L 1/06
H04W 24/02
H04W 72/04
H04W 72/08
Applicants: NOKIA TECHNOLOGIES OY
Inventors: SIVASIVA GANESAN, Rakash
ZIRWAS, Wolfgang
PANZNER, Berthold
Title: TRANSMISSION SCHEME AND FEEDBACK MECHANISM FOR TRANSMITTERS WITH CONSTRAINED RF CHAINS
Abstract:
A transmission scheme and feedback mechanism for transmitters with constrained RF chains where a MIMO radio frequency transmission is received at a receiver from a transmitter. The MIMO radio frequency transmission is received at one or more antenna elements. At the receiver, from the received transmission, a channel coefficient for the one or more antenna elements is estimated from the received transmission. A symbol constellation is generated at the receiver. The symbol constellation depends on possible combinations of the one or more antenna elements and the estimated channel coefficient for the one or more antenna elements. The receiver conveys towards the transmitter the symbol constellation.