Method for guaranteeing channel phase continuity of pre-coded RB groups, base station and computer-readable storage medium
A method for guaranteeing channel phase continuity of pre-coded RB groups, a base station and a computer-readable storage medium are described. The method includes that: a base station implements a channel estimation through a Sounding Reference Signal (SRS) measurement to obtain an uplink channel and obtains a corresponding downlink channel based on reciprocity of uplink and downlink channels; the base station calculates a weight phase correction factor based on the obtained downlink channel and corrects a pre-coding weight with the weight phase correction factor; and the base station pre-codes data according to the corrected pre-coding weight and sends the pre-coded data.
1. A method for guaranteeing channel phase continuity of pre-coded Resource Block (RB) groups, comprising: implementing, by a base station, a channel estimation through a Sounding Reference Signal (SRS) measurement to obtain an uplink channel, and obtaining, by the base station, a corresponding downlink channel based on reciprocity of uplink and downlink channels;
calculating, by the base station, a weight phase correction factor based on the obtained downlink channel, and correcting, by the base station, a pre-coding weight with the weight phase correction factor; and
pre-coding, by the base station, data according to the corrected pre-coding weight, and sending, by the base station, the pre-coded data;
wherein the calculating, by the base station, a weight phase correction factor based on the obtained downlink channel comprises:
calculating, by the base station, a channel mean by using RBs or RB Groups (RBGs) for the obtained downlink channel;
carrying out, by the base station, a singular value decomposition operation for the channel mean of a scheduled RB according to a following formula: H n =U n D n V n H , where n represents a sequence number of an RB or an RBG, H n represents a channel mean, U n and V n represent unitary matrixes, V n H represents a transposed matrix of V n , and D n represents a diagonal matrix composed of singular values of H n ; and
calculating, by the base station, a weight phase correction factor based on a result of the singular value decomposition according to a following formula:
Q
n
=
V
n
(
1
,
1
)
V
n
(
1
,
1
)
or Q n =e −j*angle(U n (1,1)) , where angle(U n ) represents phase of U n , and Q n represents a weight phase correction factor;
wherein the base station calculates, for the obtained downlink channel, a channel mean by using RBs according to a following formula:
H
n
_
=
1
6
∑
k
=
k
0
+
1
k
0
+
6
H
k
,
where n represents a sequence number of an RB, k 0 represents a sequence number of a starting subcarrier of the RB, k represents a sequence number of a subcarrier of the RB, H k represents a downlink channel, and H n represents a channel mean; or
wherein the base station calculates, for the obtained downlink channel, a channel mean by using RBGs according to a following formula:
H
n
_
=
1
6
*
N
∑
k
=
k
0
+
1
k
0
+
6
*
N
H
k
,
where n represents a sequence number of an RBG, k 0 represents a sequence number of a starting subcarrier of the RBG, k represents a sequence number of a subcarrier of the RBG, N represents a number of the RBs in the RBG, H k represents a downlink channel, and H n represents a channel mean.
2. The method for guaranteeing channel phase continuity of pre-coded RB groups according to claim 1 , wherein the pre-coding weight is corrected with the weight phase correction factor according to a following formula:
W n =(U n Q n ) H ,
where W n , represents a corrected pre-coding weight, U n represents a unitary matrix, Q n represents the weight phase correction factor, and (U n Q n ) H represents a transposed matrix of U n Q n .
3. A method for guaranteeing channel phase continuity of pre-coded Resource Block (RB) groups, comprising: implementing, by a base station, a channel estimation through a Sounding Reference Signal (SRS) measurement to obtain an uplink channel, and obtaining, by the base station, a corresponding downlink channel based on reciprocity of uplink and downlink channels;
calculating, by the base station, a weight phase correction factor based on the obtained downlink channel, and correcting, by the base station, a pre-coding weight with the weight phase correction factor; and
pre-coding, by the base station, data according to the corrected pre-coding weight, and sending, by the base station, the pre-coded data;
wherein the calculating, by the base station, a weight phase correction factor based on the obtained downlink channel comprises:
calculating, by the base station, a channel mean by using RBs or RBGs for the obtained downlink channel;
carrying out, by the base station, an eigenvalue decomposition operation for the channel mean of a scheduled RB according to a following formula: H n H n H =U n Σ n U n H , where n represents a sequence number of an RB or an RBG, H n represents a channel mean, U n represents a unitary matrix, U n H represents a transposed matrix of U n , and Σ n represents a diagonal matrix composed of characteristic values of H n ; and
calculating, by the base station, a weight phase correction factor based on a result of the eigenvalue decomposition according to a following formula: Q n =e −j*angle(U n (1,1)) , where angle(U n ) represents phase of U n , and Q n represents a weight phase correction factor;
wherein the base station calculates, for the obtained downlink channel, a channel mean by using RBs according to a following formula:
H
n
_
=
1
6
∑
k
=
k
0
+
1
k
0
+
6
H
k
,
where n represents a sequence number of an RB, k 0 represents a sequence number of a starting subcarrier of the RB, k represents a sequence number of a subcarrier of the RB, H k represents a downlink channel, and H n represents a channel mean; or
wherein the base station calculates, for the obtained downlink channel, a channel mean by using RBGs according to a following formula:
H
n
_
=
1
6
*
N
∑
k
=
k
0
+
1
k
0
+
6
*
N
H
k
,
where n represents a sequence number of an RBG, k 0 , represents a sequence number of a starting subcarrier of the RBG, k represents a sequence number of a subcarrier of the RBG, N represents a number of the RBs in the RBG, H k represents a downlink channel, and H n represents a channel mean.
4. The method for guaranteeing channel phase continuity of pre-coded RB groups according to claim 3 , wherein the pre-coding weight is corrected with the weight phase correction factor according to a following formula:
W n =(U n Q n ) H ,
where W n represents a corrected pre-coding weight, U n represents a unitary matrix, Q n represents the weight phase correction factor, and (U n Q n ) H represents a transposed matrix of U n Q n .
5. A base station, comprising:
a channel estimator configured to implement a channel estimation through a Sounding Reference Signal (SRS) measurement to obtain an uplink channel and obtain a corresponding downlink channel based on reciprocity of uplink and downlink channels;
a correction factor calculator configured to calculate a weight phase correction factor based on the obtained downlink channel and correct a pre-coding weight with the weight phase correction factor; and
a pre-coder configured to pre-code data according to the corrected pre-coding weight and send the pre-coded data;
wherein the correction factor calculator is also configured to:
calculate, for the obtained downlink channel, a channel mean by using Resource Blocks (RBs) or RB Groups (RBGs);
carry out a singular value decomposition operation for the channel mean of a scheduled RB according to a following formula: H n =U n D n V n H , where n represents a sequence number of an RB or an RBG, H n represents a channel mean, U n and V n represent unitary matrixes, V n H represents a transposed matrix of V n , and D n represents a diagonal matrix composed of singular values of H n ; and
calculate, based on a result of the singular value decomposition, a weight phase correction factor according to a following formula:
Q
n
=
V
n
(
1
,
1
)
V
n
(
1
,
1
)
or Q n =e −j*angle(U n (1,1)) , where angle(U n ) represents phase of U n , and Q n represents a weight phase correction factor;
wherein the correction factor calculator calculates, for the obtained downlink channel, a channel mean by using RBs according to a following formula:
H
n
_
=
1
6
∑
k
=
k
0
+
1
k
0
+
6
H
k
,
where n represents a sequence number of an RB, k 0 represents a sequence number of a starting subcarrier of the RB, k represents a sequence number of a subcarrier of the RB, H k represents a downlink channel, and H n represents a channel mean; or
wherein the correction factor calculator calculates, for the obtained downlink channel, a channel mean by using RBGs according to a following formula:
H
n
_
=
1
6
*
N
∑
k
=
k
0
+
1
k
0
+
6
*
N
H
k
,
where n represents a sequence number of an RBG, k 0 represents a sequence number of a starting subcarrier of the RBG, k represents a sequence number of a subcarrier of the RBG, N represents a number of the RBs in the RBG, H k represents a downlink channel, and H n represents a channel mean.
6. The base station according to claim 5 , wherein the correction factor calculator is also configured to correct the pre-coding weight with the weight phase correction factor according to a following formula:
W n =(U n Q n ) H ,
where W n represents a corrected pre-coding weight, U n represents a unitary matrix, Q n represents the weight phase correction factor, and (U n Q n ) H represents a transposed matrix of U n Q n .
7. A base station, comprising:
a channel estimator configured to implement a channel estimation through a Sounding Reference Signal (SRS) measurement to obtain an uplink channel and obtain a corresponding downlink channel based on reciprocity of uplink and downlink channels;
a correction factor calculator configured to calculate a weight phase correction factor based on the obtained downlink channel and correct a pre-coding weight with the weight phase correction factor; and
a pre-coder configured to pre-code data according to the corrected pre-coding weight and send the pre-coded data;
wherein the correction factor calculator is also configured to:
calculate, for the obtained downlink channel, a channel mean by using Resource Blocks (RBs) or RB Groups (RBGs);
carry out an eigenvalue decomposition operation for the channel mean of a scheduled RB according to a following formula: H n H n H =U n Σ n U n H , where n represents a sequence number of an RB or an RBG, H n represents a channel mean, U n represents a unitary matrix, U n H represents a transposed matrix of U n , and Σ n represents a diagonal matrix composed of characteristic values of H n ; and
calculate, based on a result of the eigenvalue decomposition, a weight phase correction factor according to a following formula: Q n =e −j*angle(U n (1,1)) , where angle(U n ) represents phase of U n , and Q n represents a weight phase correction factor;
wherein the correction factor calculator calculates, for the obtained downlink channel, a channel mean by using RBs according to a following formula:
H
n
_
=
1
6
∑
k
=
k
0
+
1
k
0
+
6
H
k
,
where n represents a sequence number of an RB, k 0 represents a sequence number of a starting subcarrier of the RB, k represents a sequence number of a subcarrier of the RB, H k represents a downlink channel, and H n represents a channel mean; or
wherein the correction factor calculator calculates, for the obtained downlink channel, a channel mean by using RBGs according to a following formula:
H
n
_
=
1
6
*
N
∑
k
=
k
0
+
1
k
0
+
6
*
N
H
k
,
where n represents a sequence number of an RBG, k 0 represents a sequence (number of a starting subcarrier of the RBG, k represents a sequence number of a subcarrier of the RBG, N represents a number of the RBs in the RBG, H k represents a downlink channel, and H n represents a channel mean.
8. The base station according to claim 7 , wherein the correction factor calculator is also configured to correct the pre-coding weight with the weight phase correction factor according to a following formula:
W n =(U n Q n ) H ,
where W n represents a corrected pre-coding weight, U n represents a unitary matrix, Q n represents the weight phase correction factor, and (U n Q n ) H represents a transposed matrix of U n Q n .