Method and system for detecting channels suitable for FM transmission in an integrated FM transmit/receive system

• US 8,027,641 B2
• Filed: 08/02/2007
• Issued: 09/27/2011
• Est. Priority Date: 03/19/2007
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Pai, Prasan, Marholev, Bojko, Walley, John, Mak, Siukai, Ibrahim, Brima, Bibaud, Scott
• Primary Examiner(s): Nguyen; Duc
• Assistant Examiner(s): AKINYEMI, AJIBOLA A
• Application Number:
  US11/832,844
• Publication Number:
  US 20080233883A1
• Time in Patent Office: 1,517 Days
• Field of Search: 455/42
• US Class Current: 455/42
• 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

A method and system is provided processing channel information may include in a mobile FM radio system including an integrated FM radio transmitter and FM radio receiver, dynamically generating a list of local FM channels, ranking local FM channels in the generated list, and selecting one of the ranked local FM channels for use by the FM transmitter based on neighboring channel interference. The FM radio receiver may detect FM channels being transmitted or not being transmitted, detect a pilot signal or a channel transmission pause. A tuning frequency of the FM radio receiver may be adjusted for scanning and detecting the local FM channels based on knowledge of a location of the FM radio receiver, received signal strength indicator (RSSI), dynamically scanning for local FM channel based on received RDS/RDBS data or country code, and/or carrier error of a related FM signal.

Claims

1. A method for processing channel information in communication system, the method comprising:

in a mobile FM radio system comprising an integrated FM radio transmitter and FM radio receiver;

dynamically generating a list of local FM channels by tuning said FM radio receiver utilizing channel spacing according to even channels, if a number of said even channels is greater than a number of odd channels, or utilizing channel spacing according to said odd channels, if a number of said odd channels is greater than a number of said even channels;

ranking local FM channels in said generated list; and

selecting one of said ranked local FM channels from said list for use by said FM radio transmitter, wherein said mobile FM radio system further communicates using cellular signals.

2. The method according to claim 1, wherein said list of local FM channels comprises unoccupied local FM channels not being transmitted.

3. The method according to claim 1, wherein said list of local FM channels comprises local FM channels currently being used for transmission.

4. The method according to claim 3, comprising detecting via said FM radio receiver, said local FM channels currently being used for transmission.

5. The method according to claim 1, comprising adjusting a tuning frequency of said FM radio receiver for scanning and detecting said local FM channels based on knowledge of a location of said FM radio receiver, received signal strength indicator (RSSI), and carrier error of a related FM signal, wherein said carrier error is based on a frequency difference between a tuning offset and a determined intermediate frequency (IF) signal.

6. The method according to claim 5, comprising dynamically adjusting said tuning frequency when said location of said mobile FM radio system changes.

7. The method according to claim 1, comprising ranking said local FM channels based on neighboring FM channel interference.

8. The method according to claim 1, comprising:

detecting a pause in one of said local FM channels currently being used for transmission;

and scanning for said local FM channels during said detected pause.

9. The method according to claim 1, comprising scanning for said local FM channels based on received RDS/RDBS data.

10. The method according to claim 1, comprising dynamically scanning for said local FM channels based on country code information in said received RDS/RDBS data.

11. The method according to claim 1, comprising dynamically generating said list of local FM channels based on a detected stereo pilot signal.

12. The method according to claim 1, wherein said generating utilizes channel spacing information based on determination of one of subsequent even and odd channels, or both of subsequent even and odd channels.

13. A non-transitory machine-readable storage having stored thereon, a computer program having at least one code section for processing channel information in communication system, the at least one code section being executable by a machine for causing the machine to perform steps comprising:

in a mobile FM radio system comprising an integrated FM radio transmitter and FM radio receiver;

dynamically generating a list of local FM channels by tuning said FM radio receiver utilizing channel spacing according to even channels, if a number of said even channels is greater than a number of odd channels, or utilizing channel spacing according to said odd channels, if a number of said odd channels is greater than a number of said even channels;

ranking local FM channels in said generated list; and

selecting one of said ranked local FM channels from said list for use by said FM radio transmitter, wherein said mobile FM radio system further communicates using cellular signals.

14. The non-transitory machine-readable storage according to claim 13, wherein said list of local FM channels comprises unoccupied local FM channels not being transmitted.

15. The non-transitory machine-readable storage according to claim 13, wherein said list of local FM channels comprises local FM channels currently being used for transmission.

16. The non-transitory machine-readable storage according to claim 15, wherein said at least one code section comprises code for detecting via said FM radio receiver, said local FM channels currently being used for transmission.

17. The non-transitory machine-readable storage according to claim 13, wherein said at least one code section comprises code for adjusting a tuning frequency of said FM radio receiver for scanning and detecting said local FM channels based on knowledge of a location of said FM radio receiver, received signal strength indicator (RSSI), and carrier error of a related FM signal, wherein said carrier error is based on a frequency difference between a tuning offset and a determined intermediate frequency (IF) signal.

18. The non-transitory machine-readable storage according to claim 17, wherein said at least one code section comprises code for dynamically adjusting said tuning frequency when said location of said mobile FM radio system changes.

19. The non-transitory machine-readable storage according to claim 13, wherein said at least one code section comprises code for ranking said local FM channels based on neighboring FM channel interference.

20. The non-transitory machine-readable storage according to claim 13, wherein said at least one code section comprises code for:

detecting a pause in one of said local FM channels currently being used for transmission, and scanning for said local FM channels during said detected pause.

21. The non-transitory machine-readable storage according to claim 13, wherein said at least one code section comprises code for scanning for said local FM channels based on received RDS/RDBS data.

22. The non-transitory machine-readable storage according to claim 13, wherein said at least one code section comprises code for dynamically scanning for said local FM channels based on country code information in said received RDS/RDBS data.

23. The non-transitory machine-readable storage according to claim 13, wherein said at least one code section comprises code for dynamically generating said list of local FM channels based on a detected stereo pilot signal.

24. The non-transitory machine-readable storage according to claim 13, wherein said generating utilizes channel spacing information based on determination of one of subsequent even and odd channels, or both of subsequent even and odd channels.

25. A system for processing channel information in communication system, the system comprising:

in a mobile FM radio system comprising an integrated FM transmitter and FM radio receiver, and at least one processor;

said at least one processor dynamically generates a list of local FM channels by tuning said FM radio receiver utilizing channel spacing according to even channels, if a number of said even channels is greater than a number of odd channels, or utilizing channel spacing according to said odd channels, if a number of said odd channels is greater than a number of said even channels; and

said at least one processor ranks local FM channels in said generated list, and selects one of said ranked local FM channels from said list for use by said FM radio transmitter, wherein said mobile FM radio system further communicates using cellular signals.

26. The system according to claim 25, wherein said list of local FM channels comprises unoccupied local FM channels not being transmitted.

27. The system according to claim 25, wherein said list of local FM channels comprises local FM channels currently being used for transmission.

28. The system according to claim 27, wherein said at least one processor detects via said FM radio receiver, said local FM channels currently being used for transmission.

29. The system according to claim 25, wherein said at least one processor adjusts a tuning frequency of said FM radio receiver for scanning and detecting said local FM channels based on knowledge of a location of said FM radio receiver, received signal strength indicator (RSSI), and carrier error of a related FM signal, wherein said carrier error is based on a frequency difference between a tuning offset and a determined intermediate frequency (IF) signal.

30. The system according to claim 25, wherein said at least one processor dynamically adjusts said tuning frequency when said location of said mobile FM radio system changes.

31. The system according to claim 25, wherein said at least one processor ranks said local FM channels based on neighboring FM channel interference.

32. The system according to claim 25, wherein said at least one processor detects a pause in one of said local FM channels currently being used for transmission, and scans for said local FM channels during said detected pause.

33. The system according to claim 25, wherein said at least one processor scans for said local FM channels based on received RDS/RDBS data.

34. The system according to claim 25, wherein said at least one processor dynamically scans for said local FM channels based on country code information in said received RDS/RDBS data.

35. The system according to claim 25, wherein said at least one processor dynamically generates said list of local FM channels based on a detected stereo pilot signal.

36. The system according to claim 25, wherein said generated list of local FM channels utilizes channel spacing information based on determination of one of subsequent even and odd channels, or both of subsequent even and odd channels.