Method and system for providing digital compensation and vector calibration for a base station in a wireless network

• US 20070117559A1
• Filed: 11/22/2005
• Published: 05/24/2007
• Est. Priority Date: 11/22/2005
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Ding, Yinong, Trivedi, Akshaya
• Granted Patent: US 8,295,884 B2
• Time in Patent Office: Days
• US Class Current: 455/423
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition

Abstract

A method for providing digital compensation and vector calibration for a base station in a wireless network is provided. The method includes performing a single process that is operable to provide simultaneously both digital compensation and vector calibration for the base station. According to one embodiment of the present disclosure, the single process is performed by receiving a transmitted signal based on a compensation/calibration (C/C) signal, processing the received signal, generating a C/C weight based on the processed signal, and using the C/C weight in a normal operational mode for the base station.

Claims

1. A method of providing digital compensation and vector calibration for a base station, comprising:

performing a single process that is operable to provide simultaneously both digital compensation and vector calibration for the base station.

2. The method as set forth in claim 1, performing the single process comprising:

receiving a transmitted signal based on a compensation/calibration (C/C) signal;

processing the received signal; and

generating a C/C weight based on the processed signal.

3. The method as set forth in claim 2, performing the single process further comprising using the C/C weight in a normal operational mode for the base station.

4. The method as set forth in claim 2, performing the single process further comprising:

generating the C/C signal; and

transmitting a signal based on the C/C signal.

5. The method as set forth in claim 1, performing the single process comprising:

generating a compensation/calibration (C/C) signal at the base station;

providing the C/C signal through a transmit chain of the base station to an antenna array of the base station;

transmitting the provided signal from the antenna array to a compensation processor;

receiving the transmitted signal at the compensation processor;

comparing the received signal to the C/C signal at the compensation processor; and

generating at the compensation processor a transmit C/C weight based on the comparing of the received signal to the C/C signal.

6. The method as set forth in claim 5, performing the single process further comprising:

providing the transmit C/C weight from the compensation processor to the base station; and

using the transmit C/C weight in a normal transmit operational mode for the base station.

7. The method as set forth in claim 1, performing the single process comprising:

generating a compensation/calibration (C/C) signal at a compensation processor;

transmitting the C/C signal from the compensation processor to an antenna array of the base station;

receiving the transmitted signal at the antenna array;

supplying the transmitted signal from the antenna array through a receive chain of the base station to a receive processor of the base station;

processing the supplied signal at the receive processor;

providing the processed signal from the receive processor to the compensation processor;

comparing the provided signal to the C/C signal at the compensation processor; and

generating at the compensation processor a receive C/C weight based on the comparing of the provided signal to the C/C signal.

8. The method as set forth in claim 7, performing the single process further comprising:

providing the receive C/C weight from the compensation processor to the base station; and

using the receive C/C weight in a normal receive operational mode for the base station.

9. A method of providing digital compensation and vector calibration for a base station, comprising:

for each of a plurality of training sequences, generating a value, d_n;

for each of the training sequences, performing a dibit to 4-QAM modulation based on the value, d_n;

for each of the training sequences, generating a frequency-domain Orthogonal Frequency Division Multiplex (OFDM) waveform based on the 4-QAM modulation; and

for each of the training sequences, performing an inverse Fast Fourier Transform on the frequency-domain OFDM waveform to generate a time-domain OFDM waveform.

10. The method as set forth in claim 9, further comprising:

generating a final training sequence result based on the time-domain OFDM waveforms generated for each of the training sequences; and

transmitting the final training sequence result.

11. The method as set forth in claim 10, generating the final training sequence result comprising multiplying together each of the time-domain OFDM waveforms generated for each of the training sequences.

12. The method as set forth in claim 10, further comprising:

receiving a first time-domain signal at a receiver based on the transmitted final training sequence result;

performing a Fast Fourier Transform on the received first time-domain signal to generate a first frequency-domain signal;

generating a second frequency-domain signal based on the first frequency-domain signal;

performing a correlation on the second frequency-domain signal;

performing a frame alignment by Fast Fourier Transforming the correlated signal to generate a second time-domain signal; and

generating a compensation/calibration (C/C) weight based on the second time-domain signal.

13. The method as set forth in claim 12, further comprising using the C/C weight in a normal operational mode for the base station.

14. The method as set forth in claim 9, the plurality of training sequences comprising 1,024 training sequences.

15. A system for providing digital compensation and vector calibration for a base station, comprising:

a compensation processor (CP) transmit processor operable to perform a single process to generate a receive compensation/calibration (C/C) weight for use by the base station, the receive C/C weight operable to provide both digital compensation and vector calibration for a receive chain of the base station; and

a CP receive processor operable to perform a single process to generate a transmit C/C weight for use by the base station, the transmit C/C weight operable to provide both digital compensation and vector calibration for a transmit chain of the base station.

16. The system as set forth in claim 15, further comprising:

a compensation processor comprising the CP transmit processor and the CP receive processor; and

a baseband module coupled to the compensation processor, the baseband module comprising a base station (BS) transmit processor operable to generate signals for transmission from the base station and a BS receive processor operable to process signals received at the base station.

17. The system as set forth in claim 16, further comprising:

a transmit chain coupled to the baseband module;

an antenna array coupled to the transmit chain;

the BS transmit processor further operable to generate a C/C signal and to provide the C/C signal through the transmit chain to the antenna array, the antenna array operable to transmit the provided signal to the compensation processor; and

the compensation processor operable to receive the transmitted signal, the CP transmit processor further operable to compare the received signal to the C/C signal and to generate the transmit C/C weight based on the comparing of the received signal to the C/C signal.

18. The system as set forth in claim 17, the compensation processor further operable to provide the transmit C/C weight to the BS transmit processor and the BS transmit processor further operable to use the transmit C/C weight in a normal transmit operational mode for the base station.

19. The system as set forth in claim 16, further comprising:

a receive chain coupled to the baseband module;

an antenna array coupled to the receive chain;

the compensation processor operable to generate a C/C signal and to transmit the C/C signal to the antenna array, the antenna array operable to receive the transmitted signal and to supply the transmitted signal through the receive chain to the BS receive processor;

the BS receive processor further operable to process the supplied signal and to provide the processed signal to the CP receive processor; and

the CP receive processor further operable to compare the provided signal to the C/C signal and to generate the receive C/C weight based on the comparing of the provided signal to the C/C signal.

20. The system as set forth in claim 19, the compensation processor further operable to provide the receive C/C weight to the BS receive processor and the BS receive processor further operable to use the receive C/C weight in a normal receive operational mode for the base station.