Method and device for antenna calibration
View Patent ↗A method for antenna calibration is provided, which includes the following steps: obtaining an updated calibration period T_i after the last time of antenna calibration (S 301 ), calculating a calibration sequence of each antenna channel in the calibration period T_i (S 302 ); according to the calibration sequence of each antenna channel, calibrating each antenna based on the calibration period T_i, and calculating a calibration error parameter (S 303 ); and according to the obtained calibration error parameter, updating the calibration period T_i, and using the updated calibration period T_i for the next time of antenna calibration (S 304 ). The technical solutions provided in the present invention, can monitor difference variety of radio channels in real time by the calibration error parameter, and reflect the calibration precision in real time by the reported calibration error parameter. Moreover, the technical solutions provided in the present invention, can adjust the calibration period in real time according to the calibration error parameter, and timely execute rational antenna calibration according to the calibration precision status.
1. An antenna calibrating method, comprising:
obtaining a calibration period T_i updated after previous antenna calibration and calculating a calibration sequence of each antenna channel in the calibration period T_i;
calibrating each antenna in the calibration period T_i according to the calibration sequence of the each antenna channel and calculating calibration error parameters; and
updating the calibration period T_i according to the obtained calibration error parameters, wherein the updated calibration period T_i is used for next antenna calibration.
2. The antenna calibrating method according to claim 1 , wherein the calibration of each antenna comprises transmission calibration and reception calibration, and the calibration period T_i comprises a transmission calibration period and a reception calibration period.
3. The antenna calibrating method according to claim 2 , wherein the calibration error parameters comprise calibration coefficients, maximum amplitude deviations of the calibrated channel and maximum phase deviations of the calibrated channel:
the calibration coefficients comprise a transmission calibration coefficient C TX (n) and a reception calibration coefficient C RX (n), wherein n=1, 2, . . . , N, and N is the number of antenna radio frequency channels;
the maximum amplitude deviations of the calibrated channel comprise a maximum amplitude deviation ε TXAMPdB of the transmission-calibrated channel and a maximum amplitude deviation ε RXAMPdB of the reception-calibrated channel; and
the maximum phase deviations of the calibrated channel comprise a maximum phase deviation ε TXPHZdeg of the transmission-calibrated channel and a maximum phase deviation ε RXPHZdeg of the reception-calibrated channel.
4. The antenna calibrating method according to claim 3 , wherein:
the transmission calibration comprises:
transmitting respective signals C TXI (n)· m n over the respective antenna channels, wherein C TXI (n) is a calibration coefficient obtained in a previous calibration period, and m n is a calibration sequence;
calculating the transmission calibration coefficient of the calibration period T_i as C TX (n)=C TXmodify (n)·C TXI (n), wherein
C
TXmodify
(
n
)
=
min
(
h
max
1
,
…
,
h
max
N
)
h
max
n
,
h max n =max(h n ), and h n is a channel characteristic of an antenna radio frequency channel n; and
performing transmission calibration on the antenna radio frequency channel n through the transmission calibration coefficient C TX (n); and
the reception calibration comprises:
receiving respective signals C RXI (n)· m n over the respective antenna channels, wherein C RXI (n) is a calibration coefficient obtained in a previous calibration period, and m n is a calibration sequence;
calculating the reception calibration coefficient of the calibration period T_i as C RX (n)=C RXmodify (n)·C RXI (n), wherein
C
RXmodify
(
n
)
=
min
(
h
max
1
,
…
,
h
max
N
)
h
max
n
,
h max n =max(h n ), and h n is a channel characteristic of an antenna radio frequency channel n; and
performing reception calibration on the antenna radio frequency channel n through the reception calibration coefficient C RX (n).
5. The antenna calibrating method according to claim 4 , wherein calculation of the calibration error parameters comprises:
ɛ
TXAMPdB
=
max
(
20
lg
(
1
C
TXmodify
)
)
-
min
(
20
lg
(
1
C
TXmodify
)
)
;
ɛ
TXPHZdeg
=
max
(
arg
(
1
C
TXmodify
)
)
-
min
(
arg
(
1
C
TXmodify
)
)
;
ɛ
RXAMPdB
=
max
(
20
lg
(
1
C
RXmodify
)
)
-
min
(
20
lg
(
1
C
RXmodify
)
)
;
and
ɛ
RXPHZdeg
=
max
(
arg
(
1
C
RXmodify
)
)
-
min
(
arg
(
1
C
RXmodify
)
)
.
6. The antenna calibrating method according to claim 4 , wherein updating of the calibration period T_i comprises:
updating the transmission calibration period comprised in the current calibration period T_i by:
with ε TXAMPdBInitial <ε TXAMPdB — limit and ε TXPHZdegInitial <ε TXPHZdeg — limit , if ε TXAMPdB <ε TXAMPdB — limit and ε TXPHZdeg <ε TXPHZdeg — limit , updating the transmission calibration period to Ti_TX=k*Ti_TX; otherwise, keeping the transmission calibration period unchanged as Ti_TX=Ti_TX; and
with ε TXAMPdBInitial ≧ε TXAMPdB — limit or ε TXPHZdegInitial ≧ε TXPHZdeg — limit , if ε TXAMPdB <ε TXAMPdB — limit and ε TXPHZdeg <ε TXPHZdeg — limit , keeping the transmission calibration period unchanged as Ti_TX=Ti_TX; otherwise, updating the transmission calibration period to Ti_TX=Ti_TX/k, wherein ε TXAMPdBInitial and ε TXPHZdegInitial are non-updated calibration parameters, ε TXAMPdB and ε TXPHZdeg are updated calibration parameters, ε TXAMPdB — limit and ε TXPHZdeg — limit are thresholds of permissible maximum calibration parameters, and k>=1; and
updating the reception calibration period comprised in the current calibration period T_i by:
with ε RXAMPdBInitial <ε RXAMPdB — limit and ε RXPHZdegInitial <ε RXPHZdeg — limit , if ε RXAMPdB <ε RXAMPdB — limit and ε RXPHZdeg <ε RXPHZdeg — limit , updating the reception calibration period to Ti_RX=k*Ti_RX; otherwise, keeping the reception calibration period unchanged as Ti_RX=Ti_RX; and
with ε RXAMPdBInitial ≧ε RXAMPdB — limit or ε RXPHZdegInitial ≧ε RXPHZdeg — limit , if ε RXAMPdB <ε RXAMPdB — limit and ε RXPHZdeg <ε RXPHZdeg — limit , keeping the reception calibration period unchanged as Ti_RX=Ti_RX; otherwise, updating the reception calibration period to Ti_RX=Ti_RX/k, wherein ε RXAMPdBInitial and ε RXPHZdegInitial are non-updated calibration parameters, ε RXAMPdB and ε RXPHZdeg are updated calibration parameters, ε RXAMPdB — limit and ε RXPHZdeg — limit are thresholds of permissible maximum calibration parameters, and k>=1.
7. An antenna calibrating device, comprising:
an obtaining module configured to obtain a calibration period T_i updated after previous antenna calibration;
a calculating module configured to calculate a calibration sequence of each antenna channel in the calibration period T_i;
a calibrating module configured to calibrate each antenna in the calibration period T_i according to the calibration sequence of the each antenna channel and to calculate calibration error parameters; and
an updating module configured to update the calibration period T_i according to the obtained calibration error parameters, wherein the updated calibration period T_i is used for next antenna calibration.
8. The antenna calibrating device according to claim 7 , wherein calibration of each antenna by the calibrating module comprises transmission calibration and reception calibration, and the calibration period T_i comprises a transmission calibration period and a reception calibration period.
9. The antenna calibrating device according to claim 8 , wherein the calibration error parameters calculated by the calibrating module comprise calibration coefficients, maximum amplitude deviations of the calibrated channel and maximum phase deviations of the calibrated channel:
the calibration coefficients comprise a transmission calibration coefficient C TX (n) and a reception calibration coefficient C RX (n), wherein n=1, 2, . . . , N, and N is the number of antenna radio frequency channels;
the maximum amplitude deviations of the calibrated channel comprise a maximum amplitude deviation ε TXAMPdB of the transmission-calibrated channel and a maximum amplitude deviation ε RXAMPdB of the reception-calibrated channel; and
the maximum phase deviations of the calibrated channel comprise a maximum phase deviation ε TXPHZdeg of the transmission-calibrated channel and a maximum phase deviation ε RXPHZdeg of the reception-calibrated channel.
10. The antenna calibrating device according to claim 9 , wherein:
transmission calibration by the calibrating module comprises:
transmitting respective signals C TXI (n)· m n over the respective antenna channels, wherein C TXI (n) is a calibration coefficient obtained in a previous calibration period, and m n is a calibration sequence;
the calibrating module calculating the transmission calibration coefficient of the calibration period T_i as C TX (n)=C TXmodify (n)·C TXI (n), wherein
C
TXmodify
(
n
)
=
min
(
h
max
1
,
…
,
h
max
N
)
h
max
n
,
h max n =max(h n ), and h n is a channel characteristic of an antenna radio frequency channel n; and
the calibrating module performing transmission calibration on the antenna radio frequency channel n through the transmission calibration coefficient C TX (n); and
reception calibration by the calibrating module comprises:
receiving respective signals C RXI (n)· m n over the respective antenna channels, wherein C RXI (n) is a calibration coefficient obtained in a previous calibration period, and m n is a calibration sequence;
the calibrating module calculating the reception calibration coefficient of the calibration period T_i as C RX (n)=C RXmodify (n)·C RXI (n), wherein
C
RXmodify
(
n
)
=
min
(
h
max
1
,
…
,
h
max
N
)
h
max
n
,
h max n =max(h n ), and h n is a channel characteristic of an antenna radio frequency channel n; and
the calibrating module performing reception calibration on the antenna radio frequency channel n through the reception calibration coefficient C RX (n).
11. The antenna calibrating device according to claim 10 , wherein calculation of the calibration error parameters by the calibrating module comprises:
ɛ
TXAMPdB
=
max
(
20
lg
(
1
C
TXmodify
)
)
-
min
(
20
lg
(
1
C
TXmodify
)
)
;
ɛ
TXPHZdeg
=
max
(
arg
(
1
C
TXmodify
)
)
-
min
(
arg
(
1
C
TXmodify
)
)
;
ɛ
RXAMPdB
=
max
(
20
lg
(
1
C
RXmodify
)
)
-
min
(
20
lg
(
1
C
RXmodify
)
)
;
and
ɛ
RXPHZdeg
=
max
(
arg
(
1
C
RXmodify
)
)
-
min
(
arg
(
1
C
RXmodify
)
)
.
12. The antenna calibrating device according to claim 11 , wherein updating of the calibration period T_i by the updating module comprises:
updating the transmission calibration period comprised in the current calibration period T_i by:
with ε TXAMPdBInitial <ε TXAMPdB — limit and ε TXPHZdegInitial <ε TXPHZdeg — limit , if ε TXAMPdB <ε TXAMPdB — limit and ε TXPHZdeg <ε TXPHZdeg — limit , updating the transmission calibration period to Ti_TX=k*Ti_TX; otherwise, keeping the transmission calibration period unchanged as Ti_TX=Ti_TX; and
with ε TXAMPdBInitial ≧ε TXAMPdB — limit or ε TXPHZdegInitial ≧ε TXPHZdeg — limit , if ε TXAMPdB <ε TXAMPdB — limit and ε TXPHZdeg <ε TXPHZdeg — limit , keeping the transmission calibration period unchanged as Ti_TX=Ti_TX; otherwise, updating the transmission calibration period to Ti_TX=Ti_TX/k, wherein ε TXAMPdBInitial and ε TXPHZdegInitial are non-updated calibration parameters, ε TXAMPdB and ε TXPHZdeg and are updated calibration parameters, ε TXAMPdB — limit and ε TXPHZdeg — limit are thresholds of permissible maximum calibration parameters, and k>=1; and
updating the reception calibration period comprised in the current calibration period T_i by:
with ε RXAMPdBInitial <ε RXAMPdB — limit and ε RXPHZdegInitial <ε RXPHZdeg — limit , if ε RXAMPdB <ε RXAMPdB — limit and ε RXPHZdeg <ε RXPHZdeg — limit , updating the reception calibration period to Ti_RX=k*Ti_RX; otherwise, keeping the reception calibration period unchanged as Ti_RX=Ti_RX; and
with ε RXAMPdBInitial ≧ε RXAMPdB — limit or ε RXPHZdegInitial ≧ε RXPHZdeg — limit , if ε RXAMPdB <ε RXAMPdB — limit and ε RXPHZdeg <ε RXPHZdeg — limit , keeping the reception calibration period unchanged as Ti_RX=Ti_RX; otherwise, updating the reception calibration period to Ti_RX=Ti_RX/k, wherein ε RXAMPdBInitial and ε RXPHZdegInitial are non-updated calibration parameters, ε RXAMPdB and ε RXPHZdeg are updated calibration parameters, ε RXAMPdB — limit and ε RXPHZdeg — limit are thresholds of permissible maximum calibration parameters, and k>=1.