US 9,319,119 B2Granted

Method and apparatus for transmitting and receiving beamforming matrix

AssigneeBeijing Nufront Mobile Multimedia Tech. Co., Ltd.

InventorsDongshan Bao, Shenfa Liu

Life of this patent

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Abstract

The present disclosure provides a method and apparatus for transmitting the beamforming matrix. The method includes calculating the maximum value mv(k) of the real part and imaginary part of the elements in subcarrier's beamforming matrix; carrying out a M bits quantization to mv(k) and obtaining the quantization amplitude Mv(k), calculating the linear part Mvlin(k) of Mv(k); carrying out a respectively Nb bits quantization to the real part and imaginary part of every element in V(k) by Mvlin(k), and obtaining the quantized beamforming matrix Vq(k); Nb is positive integer; transmitting said quantization amplitude Mv(k) and said quantized beamforming matrix Vq(k).

Claims10

Dependent claims

A method for transmitting a beamforming matrix of a subcarrier on a channel of a Multiple Input Multiple Output (MIMO) channel of a MIMO system by a transmitter in response to a feedback request from a receiver for obtaining channel information in the MIMO system, comprising:

determining, by the transmitter, a maximum value mv(k) of a real part and an imaginary part of elements in a subcarrier's beamforming matrix V(k);
determining, by the transmitter, an M bits quantization of mv(k);
determining, by the transmitter, a quantization amplitude Mv(k), M being a positive integer, wherein no division calculation is performed on mv(k) to determine Mv(k);
determining, by the transmitter, a linear part Mvlin(k) of Mv(k), wherein no division calculation is performed on mv(k) to determine the linear part Mvlin(k) of Mv(k);
determining, by the transmitter, a Nb bits quantization of a real part and imaginary part of every element in V(k) by Mvlin(k);
determining, by the transmitter, a quantized beamforming matrix Vq(k), Nb being a positive integer, wherein
V
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;
V(m,l)(k) representing an element in V(k);
V(m,l)q(R) representing a real part of quantized V(m,l)(k);
V(m,l)q(I) representing an imaginary part of quantized V(m,l)(k);
m being a row position reference, l being a column position reference;
sign(V(m,l)(k)) representing a polarity symbols of V(m,l)(k);
min(2Nb−1−1,
round
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representing a minimum value of (2Nb−1−1) and
round
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(
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
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)
-
c
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(
2
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b
-
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-
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)
;
round representing a rounding operation;
“| |” representing an absolute operation;
and c being a positive real number;
and
transmitting, by the transmitter, said quantization amplitude Mv(k) and said quantized beamforming matrix Vq(k).

253 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/376,839Filed 23 Mar 2012
Priority: CN 2012 1 00255856 Feb 2012
Published: US 2014/0355713 A14 Dec 2014
Granted: 19 Apr 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H04B 7/0456
MIMO systems: selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
H04B 7/0617
Of weighted versions of same signal: for beam forming
H04B 7/0658
Using feedback from receiving side: feedback reduction
H04B 7/0663
Feedback reduction: using vector or matrix manipulations

Family

US 2014/0355713 A1Pre-grant publication · published 4 Dec 2014
US 9,319,119 B2This patent

From the US filing history. Foreign family members aren’t listed.

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Abstract

determining, by the transmitter, a maximum value mv(k) of a real part and an imaginary part of elements in a subcarrier's beamforming matrix V(k);
determining, by the transmitter, an M bits quantization of mv(k);
determining, by the transmitter, a quantization amplitude Mv(k), M being a positive integer, wherein no division calculation is performed on mv(k) to determine Mv(k);
determining, by the transmitter, a linear part Mvlin(k) of Mv(k), wherein no division calculation is performed on mv(k) to determine the linear part Mvlin(k) of Mv(k);
determining, by the transmitter, a Nb bits quantization of a real part and imaginary part of every element in V(k) by Mvlin(k);
determining, by the transmitter, a quantized beamforming matrix Vq(k), Nb being a positive integer, wherein
V
(
m
,
l
)
q
⁡
(
R
)
=
sign
⁡
(
V
(
m
,
l
)
⁡
(
k
)
)
*
min
⁡
(
2
N
b
-
1
-
1
,
round
⁡
(

Re
⁡
(
V
(
m
,
l
)
⁡
(
k
)
)

M
v
lin
⁡
(
k
)
-
c
⁢
(
2
N
b
-
1
-
1
)
)
)
;
V
(
m
,
l
)
q
⁡
(
I
)
=
sign
⁡
(
V
(
m
,
l
)
⁡
(
k
)
)
*
min
⁡
(
2
N
b
-
1
-
1
,
round
⁡
(

Im
⁡
(
V
(
m
,
l
)
⁡
(
k
)
)

M
v
lin
⁡
(
k
)
-
c
⁢
(
2
N
b
-
1
-
1
)
)
)
;
V(m,l)(k) representing an element in V(k);
V(m,l)q(R) representing a real part of quantized V(m,l)(k);
V(m,l)q(I) representing an imaginary part of quantized V(m,l)(k);
m being a row position reference, l being a column position reference;
sign(V(m,l)(k)) representing a polarity symbols of V(m,l)(k);
min(2Nb−1−1,
round
⁡
(

Re
⁡
(
V
(
m
,
l
)
⁡
(
k
)
)

M
v
lin
⁡
(
k
)
-
c
⁢
(
2
N
b
-
1
-
1
)
)
)
representing a minimum value of (2Nb−1−1) and
round
⁡
(

Re
⁡
(
V
(
m
,
l
)
⁡
(
k
)
)

M
v
lin
⁡
(
k
)
-
c
⁢
(
2
N
b
-
1
-
1
)
)
;
round representing a rounding operation;
“| |” representing an absolute operation;
and c being a positive real number;
and
transmitting, by the transmitter, said quantization amplitude Mv(k) and said quantized beamforming matrix Vq(k).

253 more elements

Facts

Application

14/376,839Filed 23 Mar 2012

Priority

CN 2012 1 00255856 Feb 2012

Published

US 2014/0355713 A14 Dec 2014

Granted

19 Apr 2016

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

H04B 7/0456
MIMO systems: selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
H04B 7/0617
Of weighted versions of same signal: for beam forming
H04B 7/0658
Using feedback from receiving side: feedback reduction
H04B 7/0663
Feedback reduction: using vector or matrix manipulations