MULTI-BAND RECEIVER WITH HARMONIC CANCELLATION AND METHODS FOR USE THEREWITH

• US 20090291660A1
• Filed: 09/10/2008
• Published: 11/26/2009
• Est. Priority Date: 05/22/2008
• Status: Abandoned Application

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Trachewsky, Jason A.
• Application Number:
  US12/207,646
• Publication Number:
  US 20090291660A1
• Time in Patent Office: Days
• US Class Current: 455/296
• CPC Class Codes: H04L 25/03006 Arrangements for removing intersymbol interference
• CPC Class Codes: H04N 5/21 Circuitry for suppressing or minimising disturbance, e.g. moiré or halo

Abstract

A multi-band receiver includes a first receiver coupled to receive a first desired signal component of an RF signal over a first range of frequencies and generate a first received signal. A second receiver receives a second desired signal component of the RF signal over a second range of frequencies and generates a second received signal. The second receiver includes a harmonic cancellation module that attenuates a harmonic of the first desired signal component that falls within the second range of frequencies.

Claims

1. A multi-band receiver comprising:

a first receiver coupled to receive a first desired signal component of an RF signal over a first range of frequencies and generate a first received signal; and

a second receiver, coupled to receive a second desired signal component of the RF signal over a second range of frequencies and generate a second received signal, wherein the second receiver includes a harmonic cancellation module that attenuates a harmonic of the first desired signal component that falls within the second range of frequencies.

2. The multi-band receiver of claim 1, wherein the first desired signal component includes an ultra-high frequency (UHF) television signal and the second desired signal component includes a multimedia data signal.

3. The multi-band receiver of claim 1, wherein second receiver further includes:

a receiver section, coupled to the harmonic cancellation module, that generates the second received signal and a desired RF signal based on a cancelled signal;

wherein the harmonic cancellation module generates the cancelled signal based on the RF signal and the desired RF signal.

4. The multi-band receiver of claim 3, wherein harmonic cancellation module includes:

a signal modeling module that generates a fundamental signal at a fundamental frequency of the first desired signal component and that generates a plurality of coefficients, based on the RF signal and the desired RF signal;

a function module, coupled to the signal modeling module, that generates an undesired signal based on the fundamental signal and the plurality of coefficients; and

a first cancellation module, coupled to the function module, that generates the cancelled signal based on the RF signal and the undesired signal.

5. The multi-band receiver of claim 4 wherein the function module generates the undesired signal based on a polynomial function of the fundamental signal and wherein the plurality of coefficients include coefficients of the polynomial function.

6. The multi-band receiver of claim 4 wherein the signal modeling module includes a low pass filter that generates the fundamental signal based on the RF signal.

7. The multi-band receiver of claim 4 wherein signal modeling module includes a high-pass filter that generates a harmonic signal based on a residual signal in a first state.

8. The multi-band receiver of claim 7 wherein the high-pass filter generates the harmonic signal based on the RF signal in a second state.

9. The multi-band receiver of claim 7 wherein signal modeling module includes a second cancellation module that generates a residual signal based on the desired RF signal and the RF signal.

10. The multi-band receiver of claim 7 wherein signal modeling module includes a coefficient generator that generates the plurality of coefficients based on the harmonic signal and the fundamental signal.

11. A method comprising:

receiving a first desired signal component of an RF signal over a first range of frequencies;

generating a first received signal based on the first desired signal component;

receiving a second desired signal component of the RF signal over a second range of frequencies;

generating a cancelled signal from the RF signal by passing the second desired signal component while attenuating a harmonic of the first desired signal component that falls within the second range of frequencies; and

generating a second received signal based on the cancelled signal.

12. The method of claim 11, wherein the first desired signal component includes an ultra-high frequency (UHF) television signal and the second desired signal component includes a multimedia data signal.

13. The method of claim 11, wherein generating the cancelled signal includes:

generating a fundamental signal at a fundamental frequency of the first desired signal component, based on the RF signal and the desired RF signal;

generating a plurality of coefficients, based on the RF signal and the desired RF signal;

generating an undesired signal based on the fundamental signal and the plurality of coefficients; and

generating the cancelled signal based on the RF signal and the undesired signal.

14. The method of claim 13 wherein the undesired signal is generated based on a polynomial function of the fundamental signal and wherein the plurality of coefficients include coefficients of the polynomial function.

15. The method of claim 13 wherein the fundamental signal is generated by lowpass filtering the RF signal.

16. The method of claim 13 wherein generating the plurality of coefficients includes high-pass filtering a residual signal in a first state to generate a harmonic signal.

17. The method of claim 16 wherein generating the plurality of coefficients includes high-pass filtering the RF signal in a second state to generate the harmonic signal.

18. The method of claim 16 wherein generating the plurality of coefficients includes generating the residual signal based on the desired RF signal and the RF signal.

19. The method of claim 16 wherein the plurality of coefficients are generated based on the harmonic signal and the fundamental signal.