Method and apparatus for transmitting signals having a carrier-interferometry architecture
View Patent ↗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.
1. A method of generating Carrier Interferometry signals including:
providing, in a Carrier Interferometry signal generation device, 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 modulating at least one of the plurality of carrier signals with a complex weight is 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 selected from the group consisting of: shaping the plurality of substantially orthogonal 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 plurality of substantially orthogonal 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 Carrier Interferometry signal generator including:
a multi-carrier generator adapted to generate a multi-carrier signal,
a modulator configured to modulate at least one information signal onto the multi-carrier signal, and
a superposition controller configured 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.
11. The Carrier Interferometry signal generator recited in claim 10 wherein the multi-carrier generator includes at least one of a set of signal generators selected from the group consisting of: 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.
12. The Carrier Interferometry signal generator recited in claim 10 further including a filter coupled to the multi-carrier generator, the filter configured to filter at least one predetermined set of carrier signals from the multi-carrier signal.
13. The Carrier Interferometry signal generator recited in claim 10 wherein the modulator is further configured to apply weights to the multi-carrier signal for performing at least one of a set of signal-processing functions selected from the group consisting of: shaping a set of superposition signals, compensating for channel distortion, and compensating for interference.
14. The Carrier Interferometry signal generator recited in claim 10 wherein the multi-carrier generator is configured to generate the multi-carrier signal having at least one of a set of predetermined frequency-domain characteristics selected from the group consisting of: equally spaced carrier frequencies, adjacent carrier frequencies, and sparsely distributed carrier frequencies.