Channel calibration apparatus and method

• US 9,806,829 B2
• Filed: 09/26/2016
• Issued: 10/31/2017
• Est. Priority Date: 03/24/2014
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Song, Keyu
• Primary Examiner(s): PHAN, THO GIA
• Application Number:
  US15/275,715
• Publication Number:
  US 20170012717A1
• Time in Patent Office: 400 Days
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H04B 17/14 of the whole transmission and reception path, e.g. self-test loop-back
• CPC Class Codes: H04B 17/17 Detection of non-compliance or faulty performance, e.g. response deviations H04B17/18 takes precedence
• CPC Class Codes: H04B 17/21 for calibration; for correcting measurements
• CPC Class Codes: H04B 17/309 Measuring or estimating channel quality parameters
• CPC Class Codes: H04L 25/0204 of multiple channels

Abstract

A channel calibration apparatus includes a detection module, configured to detect self-loopback responses, transmission responses, and receiving responses of a to-be-calibrated antenna and a reference antenna. The apparatus also includes a processing module, configured to determine, according to the transmission responses, and the receiving responses of the to-be-calibrated antenna and the reference antenna, and according to transport channel responses, transmission responses and receive channel responses that are of the to-be-calibrated antenna and the reference antenna and obtained after processing of transmit channel responses, and then determine a transmit channel compensation response and a receive channel compensation response that are of the to-be-calibrated antenna. The processing module is also configured to make compensation for a transmit channel of the to-be-calibrated antenna according to the transmit channel compensation response, and make compensation for a receive channel of the to-be-calibrated antenna according to the receive channel compensation response.

Claims

1. An apparatus, comprising:

a processor; and

a non-transitory computer readable storage medium storing a program for execution by the processor, the program including instructions to;

detect self-loopback responses, transmission responses, and receiving responses of a to-be-calibrated antenna and a reference antenna;

determine second transmission responses and second receiving responses of the to-be-calibrated antenna and the reference antenna according to the transmission responses, the receiving responses, and transport channel responses of the to-be-calibrated antenna and the reference antenna;

determine a transmit channel compensation response and a receive channel compensation response of the to-be-calibrated antenna according to the second transmission responses and the second receiving responses of the to-be-calibrated antenna and the reference antenna after determining the second transmission responses and the second receiving responses;

compensate for a transmit channel of the to-be-calibrated antenna according to the transmit channel compensation response, wherein a transmit channel response of the to-be-calibrated antenna is consistent with t transmit channel response of the reference antenna; and

compensate for a receive channel of the to-be-calibrated antenna according to the receive channel compensation response, wherein a receive channel response of the to-be-calibrated antenna is consistent with a receive channel response of the reference antenna;

wherein the self-loopback response of the to-be-calibrated antenna is a ratio of a signal sent by a transmit channel of the to-be-calibrated antenna to a signal received by a receive channel of the to-be-calibrated antenna in response to the signal sent by the transmit channel of the to-be-calibrated antenna being received by the receive channel of the to-be-calibrated antenna;

wherein the transmission response of the to-be-calibrated antenna is a ratio of the signal sent by the transmit channel of the to-be-calibrated antenna to a signal received by a receive channel of a calibration channel in response to the signal sent by the transmit channel of the to-be-calibrated antenna being received by the receive channel of the calibration channel;

wherein the receiving response of the to-be-calibrated antenna is a ratio of a signal sent by a transmit channel of a calibration channel to a signal received by a receive channel of the to-be-calibrated antenna in response to the signal sent by the transmit channel of the calibration channel being received by the receive channel of the to-be-calibrated antenna;

wherein the self-loopback response of the reference antenna is a ratio of a signal sent by a transmit channel of the reference antenna to a signal received by a receive channel of the reference antenna in response to the signal sent by the transmit channel of the reference antenna being received by the receive channel of the reference antenna;

wherein the transmission response of the reference antenna is a ratio of the signal sent by the transmit channel of the reference antenna to the signal received by the receive channel of a calibration channel in response to the signal sent by the transmit channel of the reference antenna being received by the receive channel of the calibration channel; and

wherein the receiving response of the reference antenna is a ratio of the signal sent by the transmit channel of a calibration channel to the signal received by the receive channel of the reference antenna in response to the signal sent by the transmit channel of the calibration channel being received by the receive channel of the reference antenna.

2. The apparatus according to claim 1, wherein the instructions further comprise instructions to:

detect a self-loopback response of a calibration channel, wherein the self-loopback response of the calibration channel is a ratio of a signal sent by a transmit channel of the calibration channel to a signal received by a receive channel of the calibration channel in response to the signal sent by the transmit channel of the calibration channel being received by the receive channel of the calibration channel.

3. The apparatus according to claim 2, wherein the instructions further comprise instructions to:

number the to-be-calibrated antenna and the reference antenna together; and

determine a transport channel response H(n) of an antenna having a sequence number n, according to;

H(n)=[(H_T(n)H_R(n))/(H_CYC(n)*H_CYC(M))]^1/2; and

wherein n is a positive integer less than or equal to N, N is a total quantity of the to-be-calibrated antenna and the reference antenna, H_T(n) is a transmission response of the antenna having the sequence number n, H_R(n) is a receiving response of the antenna having the sequence number n, H_CYC(n) is a self-loopback response of the antenna having the sequence number is n, M is a sequence number of the calibration channel, M is a positive integer, and H_CYC (M) is a self-loopback response of the calibration channel having the sequence number is M.

4. The apparatus according to claim 3, wherein the instructions further comprise instructions to:

determine a transmission response H_T(n) of the antenna having the sequence number n, according to;

H_T(n)′

=H_T(n)/H(n);

wherein H_T(n)′

is the transmission response of the antenna having the sequence number is n, and H_T(n) is the transmission response of the antenna whose sequence number is n; and

determine a receiving response H_R(n)′

of the antenna having the sequence number n, according to;

H_R(n)′

=H_R(n)/H(n); and

wherein H_R(n)′

is the receiving response of the antenna having the sequence number n, and H_R(n) is the receiving response of the antenna having the sequence number n.

5. The apparatus according to claim 4, wherein the instructions further comprise instructions to:

determine a transmit channel compensation response H_TXC(a) of a to-be-calibrated antenna having the sequence number a, according to;

H_TXC(a)=H_T(b)′

/H_T(a)′

;

wherein a is the sequence number of the to-be-calibrated antenna, b is a sequence number of the reference antenna, a+b=N, N is the total quantity of the to-be-calibrated antenna and the reference antenna, H_T(b)′

is a transmission response of the reference antenna having the sequence number b, and H_T(a)′

is a transmission response of the to-be-calibrated antenna having the sequence number a; and

determine a receive channel compensation response H_RXC(a) of the to-be-calibrated antenna whose sequence number is a, according to;

H_RXC(a)=H_R(b)′

/H_R(a)′

; and

wherein H_R(b)′

is a receiving response that is of the reference antenna having the sequence number is b, and H_R(a)′

is a receiving response of the to-be-calibrated antenna having the sequence number a.

6. The apparatus according to claim 2, further comprising a calibration antenna, wherein the calibration channel is a transmit channel and a receive channel of the calibration antenna.

7. The apparatus according to claim 1, wherein the instructions further comprise instructions to:

number the to-be-calibrated antenna and the reference antenna together; and

determine a transport channel response H(n) of an antenna whose sequence number is n, according to;

H(n)=[(H_T(n)H_R(n))/H_CYC(n)]^1/2; and

wherein n is a positive integer less than or equal to N, N is a total quantity of the to-be-calibrated antenna and the reference antenna, H_T(n) is a transmission response of the antenna having the sequence number n, H_R(n) is a receiving response of the antenna having the sequence number n, and H_CYC(n) is a self-loopback response of the antenna having the sequence number is n.

8. The apparatus according to claim 7, wherein the instructions further comprise instructions to:

obtain a transmission response H_T(n)′

of the antenna having the sequence number n, according to;

H_T(n)′

=H_T(n)/H(n);

wherein H_T(n)′

is the transmission response of the antenna having the sequence number n, and H_T(n) is the transmission response of the antenna having the sequence number n; and

obtain a receiving response H_R(n)′

of the antenna having the sequence number n, according to;

H_R(n)′

=H_R(n)/H(n); and

wherein H_R(n)′

is the receiving response of the antenna having the sequence number n, and H_R(n) is the receiving response of the antenna having the sequence number n.

9. The apparatus according to claim 8, wherein the instructions further comprise instructions to:

determine a transmit channel compensation response H_TXC(a) of a to-be-calibrated antenna having the sequence number a, according to;

H_TXC(a)=H_T(b)′

/H_T(a)′

;

wherein a is the sequence number of the to-be-calibrated antenna, b is a sequence number of the reference antenna, a+b=N, N is the total quantity of the to-be-calibrated antenna and the reference antenna, H_T(b)′

is a transmission response of the reference antenna having the sequence number is b, and H_T(a)′

is a transmission response of the to-be-calibrated antenna having the sequence number a; and

determine a receive channel compensation response H_RXC(a) of the to-be-calibrated antenna having the sequence number a, according to;

H_RXC(a)=H_R(b)′

/H_R(a)′

; and

wherein H_R(b)′

is a receiving response of the reference antenna having the sequence number is b, and H_R(a)′

is a receiving response of the to-be-calibrated antenna having the sequence number a.

10. The apparatus according to claim 1, further comprising a calibration antenna, wherein the calibration channel is a transmit channel and a receive channel of the calibration antenna.

11. A method comprising:

detecting self-loopback responses, transmission responses, and receiving responses of a to-be-calibrated antenna and a reference antenna;

determining second transmission responses and second receiving responses of the to-be-calibrated antenna and the reference antenna according to the self-loopback responses, the transmission responses, the receiving responses, and transport channel responses of the to-be-calibrated antenna and the reference antenna;

determining a transmit channel compensation response and a receive channel compensation response of the to-be-calibrated antenna, according to the transmission responses and the receiving responses of the to-be-calibrated antenna and the reference antenna, after determining the second transmission responses and the second receiving responses;

compensating for a transmit channel of the to-be-calibrated antenna according to the transmit channel compensation response, wherein a transmit channel response of the to-be-calibrated antenna is consistent with a transmit channel response of the reference antenna; and

compensating for a receive channel of the to-be-calibrated antenna according to the receive channel compensation response, wherein a receive channel response of the to-be-calibrated antenna is consistent with a receive channel response of the reference antenna;

wherein the self-loopback response of the to-be-calibrated antenna is a ratio of a signal sent by a transmit channel of the to-be-calibrated antenna to a signal received by a receive channel of the to-be-calibrated antenna in response to the signal sent by the transmit channel of the to-be-calibrated antenna being received by the receive channel of the to-be-calibrated antenna;

wherein the transmission response of the to-be-calibrated antenna is a ratio of the signal sent by a transmit channel of the to-be-calibrated antenna to a signal received by a receive channel of a calibration channel in response to the signal sent by the transmit channel of the to-be-calibrated antenna being received by the receive channel of the calibration channel;

wherein the receiving response of the to-be-calibrated antenna is a ratio of a signal sent by a transmit channel of a calibration channel to the signal received by a receive channel of the to-be-calibrated antenna in response to the signal sent by the transmit channel of the calibration channel being received by the receive channel of the to-be-calibrated antenna;

wherein the self-loopback response of the reference antenna is a ratio of a signal sent by a transmit channel of the reference antenna to a signal received by a receive channel of the reference antenna in response to the signal sent by the transmit channel of the reference antenna being received by the receive channel of the reference antenna;

wherein the transmission response of the reference antenna is a ratio of the signal sent by a transmit channel of the reference antenna to the signal received by a receive channel of the calibration channel in response to the signal sent by the transmit channel of the reference antenna being received by the receive channel of the calibration channel; and

wherein the receiving response of the reference antenna is a ratio of the signal sent by the transmit channel of the calibration channel to the signal received by the receive channel of the reference antenna in response to the signal sent by the transmit channel of the calibration channel being received by the receive channel of the reference antenna.

12. The method according to claim 11, further comprising:

detecting a self-loopback response of the calibration channel, before determining the transmission responses, the receiving responses, and transport responses, wherein the self-loopback response of the calibration channel is a ratio of a signal sent by a transmit channel of the calibration channel to the signal received by the receive channel of the calibration channel in response to the signal sent by the transmit channel of the calibration channel being received by the receive channel of the calibration channel.

13. The method according to claim 12, further comprising:

numbering the to-be-calibrated antenna and the reference antenna together, after detecting the self-loopback response of the calibration channel and before determining the transmission responses, the receiving responses, and transport channel responses of the to-be-calibrated antenna and the reference antenna; and

determining a transport channel response H(n) of an antenna having a sequence number n, according to;

H(n)=[(H_T(n)H_R(n))/(H_CYC(n)*H_CYC(M))]^1/2; and

wherein n is a positive integer less than or equal to N, N is a total quantity of the to-be-calibrated antenna and the reference antenna, H_T(n) is a transmission response of the antenna having the sequence number is n, H_R(n) is a receiving response of the antenna having the sequence number n, H_CYC(n) is a self-loopback response of the antenna having the sequence number is n, M is a sequence number of the calibration channel, M is a positive integer, and H_CYC(M) is a self-loopback response of the calibration channel having the sequence number M.

14. The method according to claim 13, wherein determining, according to the transport channel responses, the transmission responses, and the receiving responses of the to-be-calibrated antenna and the reference antenna and obtained after processing comprises:

determining, a transmission response H_T(n)′

of the antenna having a sequence number n, according to;

H_T(n)′

=H_T(n)/H(n);

wherein H_T(n)′

is the transmission response of the antenna having the sequence number n, and H_T(n) is the transmission response of the antenna having the sequence number n; and

determining a receiving response H_R(n)′

of the antenna having the sequence number n, according to;

H_R(n)′

=H_R(n)/H(n); and

wherein H_R(n)′

is the receiving response of the antenna having the sequence number n, and H_R(n) is the receiving response of the antenna having the sequence number n.

15. The method according to claim 14, wherein determining, according to the transmission responses and the receiving responses of the to-be-calibrated antenna and the reference antenna, the transmit channel compensation response and the receive channel compensation response of the to-be-calibrated antenna comprises:

determining a transmit channel compensation response H_TXC(a) of a to-be-calibrated antenna having a sequence number a, according to;

H_TXC(a)=H_T(b)′

/H_T(a)′

;

wherein a is the sequence number of the to-be-calibrated antenna, b is a sequence number of the reference antenna, a+b=N, N is the total quantity of the to-be-calibrated antenna and the reference antenna, H_T(b)′

is a transmission response that is of the reference antenna having the sequence number b, and H_T(a)′

is a transmission response of the to-be-calibrated antenna having the sequence number a; and

determining a receive channel compensation response H_RXC(a) of the to-be-calibrated antenna having a sequence number a, according to;

H_RXC(a)=H_R(b)′

/H_R(a)′

; and

wherein H_R(b)′

is a receiving response of the reference antenna having the sequence number b, and H_R(a)′

is a receiving response of the to-be-calibrated antenna having the sequence number is a.

16. The method according to claim 11, further comprising:

numbering the to-be-calibrated antenna and the reference antenna together, before determining the transmission responses and the receiving responses of the to-be-calibrated antenna and the reference antenna; and

determining a transport channel response H(n) of an antenna having a sequence number n, according to;

H(n)=[H(n)H_R(n))/H_CYC(n)]^1/2; and

wherein n is a positive integer less than or equal to N, N is a total quantity of the to-be-calibrated antenna and the reference antenna, H_T(n) is a transmission response of the antenna having the sequence number is n, H_R(n) is a receiving response of the antenna having the sequence number n, and H_CYC(n) is a self-loopback response of the antenna having the sequence number n.

17. The method according to claim 16, wherein determining the transmission responses and the receiving responses of the to-be-calibrated antenna and the reference antenna comprises:

obtaining a transmission response H_T(n)′

having the sequence number n, according to;

H_T(n)′

=H_T(n)/H(n);

wherein H_T(n)′

is the transmission response of the antenna having the sequence number is n, and H_T(n) is the transmission response of the antenna having the sequence number n; and

obtaining a receiving response H_R(n)′

of the antenna having the sequence number n, according to;

H_R(n)′

=H_R(n)/H(n); and

wherein H_R(n)′

is the receiving response of the antenna having the sequence number n, and H_R(n) is the receiving response of the antenna having the sequence number n.

18. The method according to claim 17, wherein determining the transmit channel compensation response and the receive channel compensation response of the to-be-calibrated antenna comprises:

determining a transmit channel compensation response H_TXC(a) of a to-be-calibrated antenna having the sequence number a, according to;

H_TXC(a)=H_T(b)′

/H_T(a)′

;

wherein a is the sequence number of the to-be-calibrated antenna, b is a sequence number of the reference antenna, a+b=N, N is the total quantity of the to-be-calibrated antenna and the reference antenna, H_T(b)′

is a transmission response of the reference antenna having the sequence number b, and H_T(a)′

is a transmission response of the to-be-calibrated antenna having the sequence number a; and

determining a receive channel compensation response H_RXC(a) of the to-be-calibrated antenna having the sequence number a, according to;

H_RXC(a)=H_R(b)′

/H_R(a)′

; and

wherein H_R(b)′

is a receiving response having the sequence number is b, and H_R(a)′

is a receiving response of the to-be-calibrated antenna having the sequence number a.

19. A non-transitory computer readable medium that stores a program for execution by a processor, the program including instructions to:

detect self-loopback responses, transmission responses, and receiving responses of a to-be-calibrated antenna and a reference antenna;

determine second transmission responses and second receiving responses of the to-be-calibrated antenna and the reference antenna according to the transmission responses, the receiving responses, and transport channel responses of the to-be-calibrated antenna and the reference antenna;

determine a transmit channel compensation response and a receive channel compensation response of the to-be-calibrated antenna according to the second transmission responses and the second receiving responses of the to-be-calibrated antenna and the reference antenna after determining the second transmission responses and the second receiving responses;

compensate for a transmit channel of the to-be-calibrated antenna according to the transmit channel compensation response, wherein a transmit channel response of the to-be-calibrated antenna is consistent with t transmit channel response of the reference antenna; and

compensate for a receive channel of the to-be-calibrated antenna according to the receive channel compensation response, wherein a receive channel response of the to-be-calibrated antenna is consistent with a receive channel response of the reference antenna;

wherein the self-loopback response of the to-be-calibrated antenna is a ratio of a signal sent by a transmit channel of the to-be-calibrated antenna to a signal received by a receive channel of the to-be-calibrated antenna in response to the signal sent by the transmit channel of the to-be-calibrated antenna being received by the receive channel of the to-be-calibrated antenna;

wherein the transmission response of the to-be-calibrated antenna is a ratio of the signal sent by the transmit channel of the to-be-calibrated antenna to a signal received by a receive channel of a calibration channel in response to the signal sent by the transmit channel of the to-be-calibrated antenna being received by the receive channel of the calibration channel;

wherein the receiving response of the to-be-calibrated antenna is a ratio of a signal sent by a transmit channel of a calibration channel to a signal received by a receive channel of the to-be-calibrated antenna in response to the signal sent by the transmit channel of the calibration channel being received by the receive channel of the to-be-calibrated antenna;

wherein the self-loopback response of the reference antenna is a ratio of a signal sent by a transmit channel of the reference antenna to a signal received by a receive channel of the reference antenna in response to the signal sent by the transmit channel of the reference antenna being received by the receive channel of the reference antenna;

wherein the transmission response of the reference antenna is a ratio of the signal sent by a transmit channel of the reference antenna to the signal received by a receive channel of a calibration channel in response to the signal sent by the transmit channel of the reference antenna being received by the receive channel of the calibration channel; and

wherein the receiving response of the reference antenna is a ratio of the signal sent by a transmit channel of a calibration channel to the signal received by a receive channel of the reference antenna in response to the signal sent by the transmit channel of the calibration channel being received by the receive channel of the reference antenna.