Method and apparatus for transmitting signals having a carrier-interferometry architecture

• US 20040213351A1
• Filed: 02/02/2004
• Published: 10/28/2004
• Est. Priority Date: 07/19/2000
• Status: Active Grant

• Current Assignee: Arnold Alagar, Department 13, Inc. (Department 13 International Ltd.), Steve Shattil
• Original Assignee: Lot 41 Acquisition Foundation LLC (Intellectual Ventures LLC)
• Inventors: Shattil, Steve J.
• Granted Patent: US 7,639,597 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04B 2201/70706 with means for reducing the peak-to-average power ratio
• CPC Class Codes: H04L 27/2614 Peak power aspects

Abstract

Transmission waveforms are synthesized from orthogonal subcarriers using appropriate combinations of complex sub-carrier codes. This allows conventional single-carrier signaling (such as GSM and CDMA transmission protocols) to be generated and received using a multicarrier platform that is similar to OFDM. Carrier interferometry provides unprecedented bandwidth efficiency and enables substantial improvements in interference rejection, power efficiency, and system versatility.

Claims

1. A method of generating Carrier Interferometry signals including:

providing for redundantly modulating a plurality of carrier signals with a plurality of data symbols wherein a plurality of phase relationships map each of the plurality of data symbols to at least one of a plurality of substantially orthogonal superposition signals, and

providing for combining the plurality of carrier signals to generate the plurality of substantially orthogonal superposition signals.

2. The method of generating Carrier Interferometry signals recited in claim 1 wherein at least one of providing for redundantly modulating a plurality of carrier signals and providing for combining the plurality of carrier signals is adapted to provide the plurality of substantially orthogonal superposition signals with at least one of a set of signaling characteristics including time division multiple access, code division multiple access, orthogonal frequency division multiplexing, and multicarrier code division multiple access.

3. The method of generating Carrier Interferometry signals recited in claim 1 wherein at least one of providing for redundantly modulating a plurality of carrier signals and providing for combining the plurality of carrier signals includes providing for generating the carrier signals.

4. The method of generating Carrier Interferometry signals recited in claim 3 wherein providing for combining the plurality of carrier signals includes generating at least one set of carrier signals having at least one of a set of predetermined frequency characteristics, including equally spaced carrier frequencies, adjacent carrier frequencies, and sparsely distributed carrier frequencies.

5. The method of generating Carrier Interferometry signals recited in claim 1 wherein providing for redundantly modulating a plurality of carrier signals includes modulating at least one of the plurality of carrier signals with a complex weight characterized by a sum of the plurality of phase relationships.

6. The method of generating Carrier Interferometry signals recited in claim 1 further including applying weights to the plurality of carrier signals to perform at least one of a set of signal-processing functions, including shaping the superposition signals, compensating for channel distortion, and compensating for interference.

7. The method of generating Carrier Interferometry signals recited in claim 1 further including applying code weights to the plurality of carrier signals to encode the superposition signals.

8. The method of generating Carrier Interferometry signals recited in claim 1 further including providing for filtering to select a subset of the plurality of carrier signals.

9. The method of generating Carrier Interferometry signals recited in claim 1 wherein providing for redundantly modulating a plurality of carrier signals and providing for combining the plurality of carrier signals includes at least one inverse Fourier transform.

10. A multi-carrier signal comprising:

at least one set of complex carrier weights embodied in a predetermined plurality of carriers and adapted to map a plurality of data symbols to a plurality of pulse positions for producing a sequence of data-modulated pulses with spectral components characterized by the predetermined plurality of carriers.

11. The multi-carrier signal recited in claim 10 wherein the sequence of data-modulated pulses is characterized by at least one of a set of signaling characteristics including time division multiple access, code division multiple access, orthogonal frequency division multiplexing, and multi-carrier code division multiple access.

12. The multi-carrier signal recited in claim 10 wherein the plurality of carriers is characterized by at least one of a set of frequency-domain characteristics including equally spaced carrier frequencies, adjacent carrier frequencies, and sparsely distributed carrier frequencies.

13. The multi-carrier signal recited in claim 10 wherein the plurality of carriers is modulated with at least one set of pulse-shaping weights.

14. The multi-carrier signal recited in claim 10 wherein the complex carrier weights are adapted to perform at least one of a set of signal-processing functions including channel compensation, interference compensation, and shaping the data-modulated pulses.

15. The multi-carrier signal recited in claim 10 wherein the data-modulated pulses include at least one of a set of pulse sequences, including overlapping pulses, adjacent pulses, uniformly spaced pulses, and non-uniformly spaced pulses.

16. A Carrier Interferometry signal generator including:

a multi-carrier generator adapted to generate a multi-carrier signal, a modulator adapted to modulate at least one information signal onto the multi-carrier signal, and

a superposition controller adapted to provide the multi-carrier signal with at least one predetermined phase relationship to generate a time-domain signal characterized by a plurality of data-modulated pulse waveforms.

17. The Carrier Interferometry signal generator recited in claim 16 wherein the multi-carrier generator includes at least one of a set of signal generators including a pulse generator, a plurality of local oscillators, a mode-locked system, a frequency-shifted feedback system, an FFT circuit, an IFFT circuit, a non-linear system signal generator, and a wideband generator coupled to a filter bank.

18. The Carrier Interferometry signal generator recited in claim 16 further including a filter coupled to the multi-carrier generator, the filter adapted to filter at least one predetermined set of carrier signals from the multi-carrier signal.

19. The Carrier Interferometry signal generator recited in claim 16 wherein the modulator is further adapted to apply weights to the multi-carrier signal for performing at least one of a set of signal-processing functions, including shaping the superposition signals, compensating for channel distortion, and compensating for interference.

20. The Carrier Interferometry signal generator recited in claim 16 wherein the multi-carrier generator is adapted to generate the multi-carrier signal having at least one of a set of predetermined frequency-domain characteristics including equally spaced carrier frequencies, adjacent carrier frequencies, and sparsely distributed carrier frequencies.