METHOD AND SYSTEM FOR FREQUENCY CONTROL IN A FREQUENCY SHIFTING REPEATER

• US 20100159859A1
• Filed: 01/05/2009
• Published: 06/24/2010
• Est. Priority Date: 12/24/2008
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Rofougaran, Ahmadreza
• Granted Patent: US 8,090,315 B2
• Time in Patent Office: Days
• US Class Current: 455/131
• CPC Class Codes: H03D 7/166 using two or more quadrature frequency translation stages
• CPC Class Codes: H04B 7/15507 Relay station based processing for cell extension or control of coverage area, network planning with network coordinated processing with regard to cell extension H04W16/26; network topologies using dedicated repeater stations H04W84/047; terminal devices adapted for relaying to or from an other terminal H04W88/04
• CPC Class Codes: H04B 7/15528 Control of operation parameters of a relay station to exploit the physical medium

Abstract

Aspects of a method and system for frequency control in a frequency shifting repeater are provided. In this regard, a reference frequency may be divided to generate a first pair of local oscillator (LO) signals, the first pair of LO signals may be divided to generate a second pair of LO signals. The two pairs of LO signals may be utilized to frequency shift a received signal for repeating the signal on a different frequency. The frequency shifted signal may be generated by down-converting the received signal utilizing the first pair of LO signals, up-converting the down-converted signal utilizing the second pair of LO signals, and combining the resulting up-converted signals. The reference frequency may be divided by a first scaling factor to generate the first pair of LO signal which, in turn, may be divided by a second scaling factor to generate the second pair of LO signals.

Claims

1. A method for communication, the method comprising:

frequency dividing a reference frequency to generate a first pair of local oscillator signals;

frequency dividing said generated first pair of local oscillator signals to generate a second pair of local oscillator signals; and

transmitting a frequency shifted version of a received signal, wherein said frequency shifted version of said received signal is generated by;

down-converting said received signal utilizing said generated first pair of local oscillator signals to generate a corresponding pair of down-converted received signals;

up-converting said pair of down-converted received signals utilizing said second pair of local oscillator signals to generate a corresponding pair of up-converted signals; and

combining said pair of up-converted signals.

2. The method according to claim 1, comprising recovering said reference frequency from said received signal.

3. The method according to claim 1, comprising frequency dividing said reference frequency by a first scaling factor and frequency dividing said first pair of local oscillator signals by a second scaling factor.

4. The method according to claim 3, comprising controlling said first scaling factor independently of said second scaling factor.

5. The method according to claim 3, comprising controlling said first scaling factor in conjunction with said second scaling factor.

6. The method according to claim 3, comprising controlling said first scaling factor and said second scaling factor based on one or more frequencies on which one or more of a plurality of target devices receives signals.

7. The method according to claim 1, comprising controlling one or both of said first scaling factor and said second scaling factor based on a desired frequency separation between said received signal and said frequency shifted version of said received signal.

8. The method according to claim 1, comprising adjusting a polarity of said second pair of local oscillator signals prior to said up-converting of said down-converted received signal.

9. The method according to claim 1, comprising generating said pair of down-converted received signals by mixing said received signal with said first pair of local oscillator signals.

10. The method according to claim 1, comprising generating said pair of up-converted signals by mixing said pair of down-converted received signals with said second pair of local oscillator signals.

19. The system according to claim 1, wherein said one or more circuits are operable to generate said pair of down-converted received signals by mixing said received signal with said first pair of local oscillator signals.

20. The system according to claim 1, wherein said one or more circuits are operable to generate said pair of up-converted signals by mixing said pair of down-converted received signals with said second pair of local oscillator signals.

11. A system for communication, the system comprising:

one or more circuits operable to, at least;

generate a first pair of local oscillator signals by frequency dividing a reference frequency;

generate a second pair of local oscillator signals by frequency dividing said generated first pair of local oscillator signals; and

transmit a frequency shifted version of a received signal, wherein said one or more circuits generate said frequency shifted version of said received signal by;

down-converting said received signal utilizing said generated first pair of local oscillator signals to generate a corresponding pair of down-converted received signals;

up-converting said corresponding pair of down-converted received signals utilizing said second pair of local oscillator signals to generate a corresponding pair of up-converted signals; and

combining said pair of up-converted signals.

12. The system according to claim 11, wherein said one or more circuits are operable to recover said reference frequency from said received signal.

13. The system according to claim 11, wherein said one or more circuits are operable to frequency divide said reference frequency by a first scaling factor and frequency divide said first pair of local oscillator signals by a second scaling factor.

14. The system according to claim 13, wherein said one or more circuits are operable to control said first scaling factor independently of said second scaling factor.

15. The system according to claim 13, wherein said one or more circuits are operable to control said first scaling factor in conjunction with said second scaling factor.

16. The system according to claim 13, wherein said one or more circuits are operable to control said first scaling factor and said second scaling factor based on one or more frequencies on which one or more of a plurality of target devices receives signals.

17. The system according to claim 11, wherein said one or more circuits are operable to control one or both of said first scaling factor and said second scaling factor based on a desired frequency separation between said received signal and said frequency shifted version of said received signal.

18. The system according to claim 11, wherein said one or more circuits are operable to adjust a polarity of said second pair of local oscillator signals prior to said up-converting of said down-converted received signal.