Method and apparatus for receiving downlink wireless signal

摘要

A method is provided for transmitting a downlink signal by a base station with an antenna array including a plurality of antenna elements in a wireless communication system. The downlink signal is precoded using a precoding matrix for the antenna array. The precoded downlink signal is transmitted to a user equipment (UE). Each element of the precoding matrix is expressed by;∑n=1N⁢An⁢ⅇj⁢{(n-1)⁢kd⁢⁢cos⁢⁢θ+ϕn},where⁢⁢An=(N-1)!(N-n)!⁢(n-1)!,
N denotes a number of antenna elements, n denotes an index of each of the antenna elements corresponding to 1 to N−1, k denotes a propagation constant, d denotes a distance between the antenna elements, θ denotes an azimuth,
;ϕn⁡(yn)=ϕset⁡(2⁢yn(N-1)⁢d)2,
yn=(n−(N+1)/2)d, φset denotes a phase value to be applied to an antenna array 1, “!” denotes a symbol of factorial operations, and N! denotes a factorial of a non-negative integer N which is equal to a product of all positive integers less than or equal to N.

主权项

1. A method for transmitting a downlink signal by a base station with an antenna array including a plurality of antenna elements in a wireless communication system, the method comprising:
precoding, by the base station, the downlink signal using a precoding matrix for the antenna array; and transmitting, by the base station, the precoded downlink signal to a user equipment (UE), wherein each element of the precoding matrix is expressed by:∑n=1N⁢⁢An⁢ⅇj⁢{(n-1)⁢kd⁢⁢cos⁢⁢θ+ϕn},and
whereinAn=(N-1)!(N-n)!⁢(n-1)!,N denotes a number of antenna elements of the antenna array, n denotes an index of each of the antenna elements corresponding to 1 to N−1, k denotes a propagation constant, d denotes a distance between the antenna elements of the antenna array, θ denotes an azimuth,ϕn⁡(yn)=ϕset⁡(2⁢yn(N-1)⁢d)2,yn=(n−(N+1)/2)d, φset denotes a phase value to be applied to an antenna array 1, “!” denotes a symbol of factorial operations, and N! denotes a factorial of a non-negative integer N equal to a product of all positive integers less than or equal to N.