Digital frequency hopping in multi-band OFDM

• US 20080137716A1
• Filed: 12/06/2006
• Published: 06/12/2008
• Est. Priority Date: 12/06/2006
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Lakkis, Ismail
• Granted Patent: US 8,320,474 B2
• Time in Patent Office: Days
• US Class Current: 375/135
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04B 2001/71367 using a transform
• CPC Class Codes: H04L 5/0044 allocation of payload

Abstract

A transmitter configured for generating a frequency-hopped OFDM signal comprises a digital Fourier transform circuit, a variable bandpass filter, and a frequency-hopping controller. The digital Fourier transform circuit comprises a plurality of input frequency bins and is configured to modulate complex data symbols onto a plurality of OFDM subcarriers. The variable bandpass filter selects sets of the plurality of input frequency bins for frequency hopping the OFDM subcarriers over a plurality of subbands. The frequency-hopping controller controls the variable bandpass filter with respect to at least one predetermined frequency-hopping pattern. A receiver configured for processing a received frequency-hopped OFDM signal comprises a digital Fourier transform circuit configured to convert a received digital baseband signal into a frequency-domain signal comprising a plurality of OFDM symbols, a variable bandpass filter configured to select sets of the OFDM symbols with respect to predetermined subbands, and a frequency-hopping controller configured to control the variable bandpass filter with respect to a predetermined frequency-hopping pattern.

Claims

1. A transmitter configured for generating a frequency-hopped OFDM signal, comprising:

a digital Fourier transform circuit comprising a plurality of input frequency bins and configured to modulate complex data symbols onto a plurality of OFDM subcarriers,

a variable bandpass filter configured to select sets of the plurality of input frequency bins for frequency hopping the OFDM subcarriers across a plurality of subbands, and

a frequency-hopping controller configured to control the variable bandpass filter for selecting the sets with respect to at least one predetermined frequency-hopping pattern.

2. The transmitter recited in claim 1, wherein the digital Fourier transform circuit is configured to perform an inverse discrete Fourier transform.

3. The transmitter recited in claim 2, wherein the digital Fourier transform circuit is configured to perform an inverse fast Fourier transform.

4. The transmitter recited in claim 1 configured to operate in an MB-OFDM system.

5. The transmitter recited in claim 1 integrated in a chipset.

6. A method for performing digital frequency hopping of an OFDM signal, comprising:

providing for performing an inverse discrete Fourier transform of a plurality of complex data symbols for producing a wideband OFDM signal having a baseband channel bandwidth comprising a plurality of subbands,

providing for frequency-bin selection to select each of a plurality of sets of frequency bins of the inverse discrete Fourier transform as inputs for the plurality of complex data symbols, thereby selecting each of the plurality of subbands, and

providing for controlling frequency-bin selection with respect to at least one predetermined frequency-hopping pattern.

7. The method recited in claim 6, wherein providing for performing the inverse discrete Fourier transform comprises performing an inverse fast Fourier transform.

8. A chipset configured to perform the method recited in claim 6.

9. A digital computer system programmed to perform the method recited in claim 6.

10. A computer-readable medium storing a computer program implementing the method of claim 6.

11. A system configured for performing digital frequency hopping of an OFDM signal, comprising:

a digital Fourier transform means configured for performing an inverse discrete Fourier transform of a plurality of complex data symbols for producing a wideband OFDM signal having a bandwidth comprising a plurality of subbands,

a subband selection means configured for selecting each of a plurality of sets of frequency bins of the inverse discrete Fourier transform as inputs for the plurality of complex data symbols, thereby selecting each of the plurality of subbands, and

a frequency-hopping control means configured for controlling frequency-bin selection with respect to at least one predetermined frequency-hopping pattern.

12. The system recited in claim 11, wherein the digital Fourier transform means is configured to perform an inverse fast Fourier transform.

13. The system recited in claim 11 configured to operate in an MB-OFDM system.

14. The system recited in claim 11 integrated in a chipset.

15. A receiver configured for processing a received frequency-hopped OFDM signal, the receiver comprising:

a digital Fourier transform circuit comprising a plurality of output frequency bins and configured to convert a received digital baseband signal into a frequency-domain signal comprising a plurality of OFDM symbols at the plurality of output frequency bins,

a variable bandpass filter configured to select sets of the plurality of output frequency bins for selecting each of a plurality of subbands, and

a frequency-hopping controller configured to control the variable bandpass filter for selecting the sets with respect to at least one predetermined frequency-hopping pattern.

16. The receiver recited in claim 15, wherein the digital Fourier transform circuit is configured to perform a discrete Fourier transform.

17. The receiver recited in claim 16, wherein the digital Fourier transform circuit is configured to perform a fast Fourier transform.

18. The receiver recited in claim 15, further configured to operate in an MB-OFDM system.

19. The receiver recited in claim 15 integrated in a chipset.

20. A method for processing a received frequency-hopped OFDM signal, comprising:

providing for performing a discrete Fourier transform to convert a received digital baseband signal into a frequency-domain signal comprising a plurality of OFDM symbols at a plurality of output frequency bins,

providing for frequency-bin selection to select sets of the plurality of frequency bins, thereby selecting each of a plurality of subbands of the received frequency-hopped OFDM signal, and

providing for controlling frequency-bin selection with respect to a predetermined frequency-hopping pattern.

21. The method recited in claim 20, wherein providing for performing the discrete Fourier transform comprises performing a fast Fourier transform.

22. A chipset configured to perform the method recited in claim 20.

23. A digital computer system programmed to perform the method recited in claim 20.

24. A computer-readable medium storing a computer program implementing the method of claim 20.

25. A system configured for processing a received frequency-hopped OFDM signal, comprising:

a discrete Fourier transform means configured for performing a discrete Fourier transform of a received digital baseband signal for producing a frequency-domain signal comprising a plurality of OFDM symbols at a plurality of output frequency bins,

a subband selection means configured for selecting sets of the plurality of output frequency bins, thereby selecting subbands of the received frequency-hopped OFDM signal, and

a frequency-hopping control means configured for controlling the subband selection means with respect to at least one predetermined frequency-hopping pattern.

26. The system recited in claim 25, wherein the discrete Fourier transform means is configured to perform a fast Fourier transform.

27. The system recited in claim 25 configured to operate in an MB-OFDM system.

28. The system recited in claim 25 integrated in a chipset.