Patent ID: 8705474
Filing Date: 2014-04-22
Classification: H04B,H04J,H04L,H04W

Abstract:
1. A method of transmitting a demodulation reference signal (DMRS) for a physical uplink shared channel (PUSCH) in a wireless communication system, the method comprising: generating a first, second, third, and fourth DMRS sequences respectively associated with a first, second, third and fourth layers, wherein a first, second, third, and fourth cyclic shifts are allocated to the first, second, third and fourth DMRS sequences, respectively; mapping the first, second, third and fourth DMRS sequences to resource elements (REs) included in two slots, wherein the first and second DMRS sequences mapped in a second slot of the two slots are multiplied by 1, and wherein the third and fourth DMRS sequences mapped in the second slot of the two slots are multiplied by −1; and transmitting the first, second, third and fourth DMRS sequences to a base station, wherein the first, second, third and fourth cyclic shifts are determined, respectively, based on a first, second, third and fourth parameters, respectively, wherein the first and second parameters are separated by a maximum value corresponding to a total number of possible cyclic shifts, and wherein the third and fourth parameters are separated by the maximum value corresponding to the total number of possible cyclic shifts.