Patent ID: 9461767
Filing Date: 2016-10-04
CPC Classification: H04B,H04J,H04L

Claim Text:
1. A transmitter, comprising: a reference signal generator configured to generate a reference signal, wherein the reference signal generator comprises: a third spectrum spreading unit configured to spread spectrums of elements in the sequence to be mapped to a third frequency resource of the resource block, by using a third group of codes; and a fourth spectrum spreading unit configured to spread spectrums of elements in the sequence to be mapped to a fourth frequency resource of the resource block, by using a fourth group of codes, wherein the third and fourth frequency resources are adjacent frequency resources in frequency resource elements used for reference signal transmission in the resource block, and the third and fourth groups of codes are mirrors in column to each other, wherein the mapping unit maps the elements with their spectrums spread by the third and fourth spectrum spreading units to the third and fourth frequency resources of the resource block, respectively, wherein one of the third and fourth groups of codes is formed by performing a column vector cyclic shift to one of the first and second groups of codes, wherein the elements mapped using the first group of codes and the elements mapped using the third group of codes are adjacent in subcarriers, and the elements mapped using the second group of codes and the elements mapped using the forth group of codes are adjacent in subcarriers, and wherein, the transmitter transmits the reference signals to a receiver.