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1. (WO2014197710) METHODS FOR CODEBOOK SUB-SAMPLING

Pub. No.:    WO/2014/197710    International Application No.:    PCT/US2014/041120
Publication Date: Fri Dec 12 00:59:59 CET 2014 International Filing Date: Fri Jun 06 01:59:59 CEST 2014
IPC: H04B 7/04
H04B 7/06
Applicants: GOOGLE TECHNOLOGY HOLDINGS LLC
Inventors: KRISHANMURTHY, Sandeep, H.
BROWN, Tyler, A.
LOVE, Robert, T.
NANGIA, Vijay
Title: METHODS FOR CODEBOOK SUB-SAMPLING
Abstract:
Disclosed are methods for codebook sub-sampling. In various implementations, a wireless terminal receives a reference signal, determines, based on the reference signal, a first precoding index i2 for a first subband and a second precoding index i'2 for a second subband. The wireless terminal transmits a representation of i2 and a representation of i'2 to a base station. In various implementations, i'2 belongs to the set Si2 which, in one implementation, equals {mod(i2 -K1+k,K), k=0,1,...,K2}, where K1>1, and where K2>1 and K>1 are integers. According to an implementation, the wireless terminal receives the reference signal from a first base station and transmits the representations of i2 and i'2 to a second base station.