Patent ID: 9647811
Date: 2017-05-09
CPC Classifications: H04J,H04L

Claim:
1. A method for transmitting, by base station (BS), user equipment specific reference signals (UE-RSs) to a user equipment (UE), the method comprising: applying, by the BS, a set of Walsh codes to the UE-RSs; and transmitting, by the BS, the Walsh code applied UE-RSs on resource block (RB) pairs allocated to the UE, wherein the applying comprises: applying the set of Walsh codes to the UE-RSs in a forward direction of a time domain on a first subcarrier of a first RB pair, in a reverse direction of the time domain on a second subcarrier of the first RB pair and in the forward direction of the time domain on a third subcarrier of the first RB pair so as to be a first UE-RS pattern, and applying the set of Walsh codes to the UE-RSs in the reverse direction of the time domain on a first subcarrier of a second RB pair contiguous to the first RB pair in the frequency domain, in the forward direction of the time domain on a second subcarrier of the second RB pair and in the reverse direction of the time domain on a third subcarrier of the second RB pair so as to be a second UE-RS pattern, and wherein the first UE-RS pattern and the second UE-RS pattern are repeated in a frequency domain of the RBs allocated to the UE in units of two contiguous RB pairs, where the set of Walsh codes includes W0=[+1 +1 +1 +1], W1=[+1 −1 +1 −1], W2=[+1 +1 −1 −1], and W3=[+1 −1 −11 +1], and wherein the applying comprises: multiplying W0, W1, W2 and W3 to a first UE-RS, a second UE-RS, a third UE-RS and a fourth UE-RS among the UE-RSs, respectively.