Method and system for simultaneous signal transmission on multiple selected frequencies

• US 7,974,590 B2
• Filed: 09/14/2007
• Issued: 07/05/2011
• Est. Priority Date: 03/19/2007
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Ibrahim, Brima Babatunde, Walley, John, Mak, Siukai, Marholev, Bojko
• Primary Examiner(s): Phu; Sanh D
• Application Number:
  US11/855,217
• Publication Number:
  US 20080233897A1
• Time in Patent Office: 1,390 Days
• Field of Search: 455/103, 455/296, 455/226.1, 455/323, 455/302, 455/326, 455/343.1, 375/329, 375/349
• US Class Current: 455/103
• CPC Class Codes: H03L 7/085 concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal H03L7/10 takes precedence; circuits for comparing the phase or frequency of two mutually-independent oscillations H03D13/00
• CPC Class Codes: H03L 7/181 a numerical count result being used for locking the loop, the counter counting during fixed time intervals H03L7/1806 takes precedence

Abstract

Aspects of a method and system for simultaneous signal transmission on multiple selected frequencies may include generating from a single baseband signal, a plurality of radio frequency transmission signals each at a different radio frequency, wherein the single baseband signal comprises an in-phase signal component and/or a quadrature signal component. The single baseband signal, to generate said plurality of radio frequency transmission signals, may be modulated in a single radio frequency transmission chain, the radio frequency transmission chain comprising intermediate frequency modulation and radio frequency modulation. The plurality of radio frequency transmission signals may be a radio frequency signal and a corresponding image frequency signal, based on the intermediate frequency modulation and the radio frequency modulation. The signals resulting from the intermediate frequency modulation and the radio frequency modulation may be filtered to preserve the radio frequency signal and the corresponding image frequency signal.

Claims

1. A method for processing communication signals, the method comprising:

performing by one or more processors and/or circuits in a transmitter;

generating from a single baseband signal, a plurality of radio frequency transmission signals each at a different radio frequency, wherein said single baseband signal comprises an in-phase signal component and/or a quadrature signal component;

modulating in a single radio frequency transmission chain, said single baseband signal, to generate said plurality of radio frequency transmission signals, said radio frequency transmission chain comprising intermediate frequency modulation and radio frequency modulation.

2. The method according to claim 1, wherein said plurality of radio frequency transmission signals comprises a radio frequency signal and a corresponding image frequency signal, based on said intermediate frequency modulation and said radio frequency modulation.

3. The method according to claim 2, comprising filtering signals resulting from said intermediate frequency modulation and said radio frequency modulation to preserve said radio frequency signal and said corresponding image frequency signal.

4. The method according to claim 2, wherein said radio frequency signal is centered at a frequency f1+f2 and said image frequency signal is centered at a frequency f1−

f2, where f1 and f2 are frequencies.

5. The method according to claim 4, wherein said frequencies f1 and f2 correspond to said radio frequency modulation and said intermediate frequency modulation.

6. The method according to claim 1, wherein said plurality of radio frequency transmission signals are frequency modulated signals.

7. The method according to claim 1, comprising summing, in said radio frequency transmission chain, a plurality of intermediate frequency signal components and perform said radio frequency modulation on said sum of said plurality of intermediate frequency signal components.

8. The method according to claim 1, comprising summing, in said radio frequency transmission chain, a plurality of radio frequency signal components, to obtain said plurality of radio frequency transmission signals.

9. The method according to claim 1, comprising band-limiting said a single baseband signal.

10. The method according to claim 1, comprising up-converting said in-phase signal component and/or said quadrature signal component to radio frequency signals.

11. A system for processing communication signals, the system comprising:

one or more circuits, said one or more circuits enable;

generation from a single baseband signal, of a plurality of radio frequency transmission signals each at a different radio frequency, wherein said single baseband signal comprises an in-phase signal component and/or a quadrature signal component;

modulation in a single radio frequency transmission chain, of said single baseband signal, to generate said plurality of radio frequency transmission signals, said radio frequency transmission chain comprising intermediate frequency modulation and radio frequency modulation.

12. The system according to claim 11, wherein said plurality of radio frequency transmission signals is a radio frequency signal and a corresponding image frequency signal, based on said intermediate frequency modulation and said radio frequency modulation.

13. The system according to claim 12, wherein said one or more circuits filter signals resulting from said intermediate frequency modulation and said radio frequency modulation to preserve said radio frequency signal and said corresponding image frequency signal.

14. The system according to claim 12, wherein said radio frequency signal is centered at a frequency f1+f2 and said image frequency signal is centered at a frequency f1−

f2, where f1 and f2 are frequencies.

15. The system according to claim 14, wherein said frequencies f1 and f2 correspond to said radio frequency modulation and said intermediate frequency modulation.

16. The system according to claim 11, wherein said plurality of radio frequency transmission signals are frequency modulated signals.

17. The system according to claim 11, wherein said one or more circuits sum, in said radio frequency transmission chain, a plurality of intermediate frequency signal components and perform said radio frequency modulation on said sum of said plurality of intermediate frequency signal components.

18. The system according to claim 11, wherein said one or more circuits sum, in said radio frequency transmission chain, a plurality of radio frequency signal components, to obtain said plurality of radio frequency transmission signals.

19. The system according to claim 11, wherein said one or more circuits band-limit said a single baseband signal.

20. The system according to claim 11, wherein said one or more circuits up-convert said in-phase signal component and/or said quadrature signal component to radio frequency signals.