Method and device for acquiring channel information

Patent metadata

Field	Value
Publication number	US-2016156399-A1
Application number	US-201414906010-A
Country	US
Kind code	A1
Filing date	May 20, 2014
Priority date	Jul 22, 2013
Publication date	Jun 2, 2016
Grant date	—

Abstract

The present disclosure discloses a method and device for acquiring channel information, and relates to a massive antenna array transmission technology. The method includes that: a receiving side acquires indexes L of M antennae which send reference signals in N antennae of a sending side; channel information Y between the M antennae and a receiving antenna of the receiving side is acquired; a unitary matrix W with a dimension of N×N is acquired; and an estimate S′ of channel information S between the N antennae of the sending side and the receiving antenna of the receiving side is determined by virtue of the indexes L, the unitary matrix W and the channel information Y.

First claim

What is claimed is:

1 . A method for acquiring channel information, comprising:
acquiring, by a receiving side, indexes L of M antennae which send reference signals in N antennae of a sending side; acquiring channel information Y between the M antennae and a receiving antenna of the receiving side; acquiring a unitary matrix W with a dimension of N×N; and determining an estimate S′ of channel information S between the N antennae of the sending side and the receiving antenna of the receiving side by virtue of the indexes L, the unitary matrix W and the channel information Y.

2 . The method according to claim 1 , wherein the step of acquiring, by the receiving side, the indexes L of the M antennae which send the reference signals in the N antennae of the sending side comprises:
acquiring, by the receiving side, intrinsic indexes L of the M antennae, or acquiring the indexes L of the M antennae according to time and/or frequency resource locations, or acquiring the indexes L of the M antennae through first system or control information from the sending side.

3 . The method according to claim 2 , wherein the receiving side directly acquires the indexes L of the M antennae from the first system or control information, or acquires the indexes L of the M antennae through antenna array indexes in the first system or control information.

4 . The method according to claim 1 , wherein the step of acquiring the channel information Y between the M antennae and the receiving antenna of the receiving side comprises:
acquiring, by the receiving side, channel information {y 1 , y 2 , . . . , y M } between each antenna in the M antennae and the receiving antenna according to reference data and received data at a reference signal resource location of each antenna in the M antennae; and combining the channel information {y 1 , y 2 , . . . , y M } between each antenna in the M antennae and the receiving antenna to obtain the channel information Y.

5 . The method according to claim 1 , wherein the step of acquiring the unitary matrix W with the dimension of N×N comprises:
acquiring, by the receiving side, the unitary matrix W which is predetermined, or determining the unitary matrix W through second system or control information from the sending side.

6 . The method according to claim 5 , wherein the unitary matrix W which is predetermined is a Discrete Fourier Transform (DFT) matrix with a dimension of N×N, and each element of the unitary matrix W is:

W
pq

=

C
·

exp


(

j2π


(

p
-
1

)



(

q
-
1

)

N

)

;

p
=
1

,
2
,
…


,

N
;

q
=
1

,
2
,
…


,
N

where p and q represent a row index and a column index of the unitary matrix W respectively, and C is a normalized constant factor.

7 . The method according to claim 5 , wherein the second system or control information comprises an antenna element number N v in a vertical direction, an antenna element number N h in a horizontal direction, a polarized antenna element indicator and related information about a polarized matrix W pol .

8 . The method according to claim 7 , wherein the step of determining the unitary matrix W through the second system or control information from the sending side comprises:
determining the unitary matrix W with the dimension of N×N by calculating a kronecker product of a DFT matrix W v with a dimension of N v ×N v in the vertical direction, the polarized matrix W pol and a DFT matrix W h with a dimension of N h ×N h in the horizontal direction; wherein when it is determined, according to the polarized antenna element indicator, that the N antennae of the sending side are single-polarized antenna elements, a product of N v and N h is N and W pol is a scalar 1; and when it is determined, according to the polarized antenna element indicator, that the N antennae of the sending side are dual-polarized antenna elements, twice of the product of N v and N h is N and W pol is a polarized matrix with a dimension of 2×2.

9 . The method according to claim 1 , wherein the step of determining the estimate S′ of the channel information S between the N antennae of the sending side and the receiving antenna of the receiving side by virtue of the indexes L, the unitary matrix W and the channel information Y comprises:
acquiring, by the receiving side, a random matrix P with a dimension of M×N by virtue of the indexes L;
determining a vector X by virtue of the random matrix P, the unitary matrix W and the channel information Y; and
determining the estimate S′ of the channel information S between the N antennae and the receiving antenna by virtue of the unitary matrix W and the vector X.

10 . The method according to claim 9 , wherein an i m th element in an mth row of the random matrix P is 1 and other elements are 0, wherein the i m is an antenna index of the mth antenna in the M antennae, and m=1, 2, . . . , M.

11 . The method according to claim 10 , wherein the vector X is a vector with a smallest norm in a vector set {V 1 , V 2 , . . . , V K }, wherein any vector V i in the vector set {V 1 , V 2 , . . . , V K } meets that: a product of the random matrix P, the unitary matrix W or a conjugate transpose of the unitary matrix W and the vector V i is equal to the channel information Y, and the norm is a sum of absolute values of all elements of the vector.

12 . The method according to claim 9 , wherein determining the estimate S′ of the channel information S between the N antennae and the receiving antenna by virtue of the unitary matrix W and the vector X comprises:
determining the estimate S′ of the channel information S between the N antennae and the receiving antenna by calculating a product of the unitary matr

Assignees

• Zte Corp

Inventors

• Chen Xianming
• Zhu Dengkui
• Xiao Huahua
• Lu Zhaohua

Classifications

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04B7/0639 Primary

  Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection · CPC title

• H04L25/0228

  with direct estimation from sounding signals · CPC title

• H04L25/0204

  of multiple channels · CPC title

• H04B7/0413

  MIMO systems · CPC title