Patent ID: 9001775
Filing Date: 2015-04-07
Classification: H04B,H04J,H04L,H04W

Abstract:
1. A method for receiving, by a base station (BS), demodulation reference signals (DMRSs) for a physical uplink shared channel (PUSCH) in a wireless communication system, the method comprising: receiving first, second, third and fourth DMRS sequences, which are respectively associated with first, second, third, and fourth layers, from a user equipment (UE), wherein the first, second, third and fourth DMRS sequences are generated, by the UE, by using first, second, third, and fourth values assigned for the first, second, third and fourth layers respectively, wherein the first and second values are separated by a maximum value corresponding to a total number of possible cyclic shifts, and wherein the third and fourth values are separated by the maximum value corresponding to the total number of possible cyclic shifts, and wherein the first, second, third and fourth DMRS sequences are mapped, by the UE, to resource elements (REs) in two slots, wherein the first and second DMRS sequences mapped in a second slot among the two slots are multiplied by 1, and wherein the third and fourth DMRS sequences mapped in the second slot among the two slots are multiplied by −1.