Patent ID: 9548802
Date: 2017-01-17
CPC Classifications: H04B,H04W

Claim:
1. A method for receiving multiple-input multiple-output (MIMO) transmissions, the method comprising: a wireless transmit/receive unit (WTRU) receiving at least one of a plurality of downlink transmissions from an eNodeB on at least one of a plurality of spatial layers, wherein the plurality of spatial layers are transmitted to a plurality of WTRUs for multi-user MIMO, and wherein the at least one spatial layer is used for reception by the WTRU; the WTRU receiving at least one WTRU-specific reference signal corresponding to the at least one downlink transmission; and the WTRU decoding the at least one downlink transmission based on the at least one corresponding WTRU-specific reference signal for the WTRU, wherein resource elements are allocated to resource blocks, and the resource blocks include WTRU-specific reference signals for the plurality of WTRUs and the downlink transmission such that WTRU-specific reference signals for different sub-groups of antenna ports are multiplexed onto different subcarriers in a frequency domain and the WTRU-specific reference signals of the same sub-group of antennas ports are each applied with a different orthogonal cover code in a time domain, wherein each sub-group of antenna ports includes at least two antenna ports, and wherein resource elements used for the downlink transmission are rate matched around resource elements allocated for the at least one WTRU-specific reference signal for the WTRU on at least one antenna port in one sub-group and are rate matched around resource elements allocated for at least one WTRU-specific reference signal for at least another WTRU on at least one antenna port in another sub-group, wherein the resource elements allocated for the at least one WTRU-specific reference signal for at least another WTRU are muted.