Claims
- 1. A method for extracting a selected symbol from a phase-modulated carrier having a phaseform representative of the selected symbol and at least two additional symbols having a temporal overlap with the selected symbol, the selected symbol being transmitted during a selected-symbol transmission interval, the phaseform being generated by evaluating a combination of transmitting-filter responses having finite duration, the combination including a first element generated by weighting a selected transmitting-filter response by the selected symbol, said method comprising the steps of
providing a receiving-filter response corresponding to the selected transmitting-filter response, filtering the phaseform with the receiving-filter response, thereby generating a weighted output representative of the combination of transmitting-filter responses weighted by the receiving-filter response, accumulating the weighted output during a transmission interval, thereby generating a signal representative of the selected symbol.
- 2. The method of claim 1 further comprising the step of selecting the phase-modulated carrier to be a digital signal.
- 3. The method of claim 1 further comprising the step of selecting the phase-modulated carrier to be an analog signal.
- 4. The method of claim 1 further comprising the step of selecting the phaseform to be a digital signal.
- 5. The method of claim 1 further comprising the step of selecting the phaseform to be an analog signal.
- 6. The method of claim 1 wherein the step of providing a receiving-filter response comprises the step of selecting the receiving-filter response to be shift-orthogonal to the selected transmitting-filter response.
- 7. The method of claim 1 wherein the step of providing a receiving-filter response comprises the step of selecting the receiving-filter response to be shift-biorthogonal to the selected transmitting-filter response.
- 8. The method of claim 1 wherein the step of accumulating the weighted output over the transmitting interval comprises the step of summing the weighted output at each of a plurality of times in the transmitting interval.
- 9. The method of claim 1 wherein the step of accumulating the weighted output over the transmitting interval comprises the step of integrating the weighted output during the transmitting interval.
- 10. A method for extracting a selected symbol from a phase-modulated carrier having a phaseform representative of the selected symbol and at least one additional symbol having a temporal overlap with the selected symbol, the selected symbol being transmitted during a selected symbol transmission interval, the phaseform being generated by evaluating a combination of transmitting-filter responses, the combination including a first element generated by weighting a selected transmitting-filter response by the selected symbol, said method comprising the steps of
providing a selected receiving-filter response matched to the selected transmitting-filter response, and filtering the phaseform with the selected receiving-filter response, thereby generating a weighted output representative of the combination of transmitting-filter responses weighted by the selected receiving-filter response, and accumulating the weighted output during a transmission interval, thereby generating a signal representative of the selected symbol.
- 11. A method for modulating a phaseform of a carrier by encoding thereon a first symbol and at least two additional symbols having a temporal overlap with the first symbol, said method comprising the steps of
evaluating a combination of transmitting-filter responses, each of the transmitting-filter responses having finite duration, the combination including a first element formed by weighting a first transmitting-filter response by the first symbol, the first transmitting-filter response selected to correspond to a first receiving-filter response, modulating the phaseform of the carrier with the combination of transmission-filter responses.
- 12. A method for encoding a first symbol and a second symbol on a phase component of a carrier signal, the first symbol being transmitted during a first interval, the second symbol being transmitted during a second interval partially overlapping the first interval, said method comprising the steps of
filtering the first symbol with a first transmitting filter-function having finite duration in a first interval, thereby generating a first weighted signal, filtering the second symbol with a second transmitting filter-function having finite duration in a second interval partially overlapping the first interval, thereby generating a second weighted signal, generating a modulating quantity on the basis of at least the first weighted signal and the second weighted signal, and modulating the phase component of the carrier signal on the basis of the modulating quantity.
- 13. The method of claim 12 wherein the step of generating the modulating quantity comprises the step of summing the first weighted signal and the second weighted signal.
- 14. The method of claim 12 wherein the step of modulating the phase component of the carrier signal comprises the step of selecting the phase component to be equal to the modulating quantity.
- 15. A receiver for extracting a selected symbol from a phase-modulated carrier having a phaseform representative of the selected symbol and at least two additional symbols having a temporal overlap with the selected symbol, the selected symbol being transmitted during a selected-symbol transmission interval, the phaseform being generated by evaluating a combination of transmitting-filter responses having finite duration, the combination including a first element generated by weighting a selected transmitting-filter response by the selected symbol, the receiver comprising
a demodulator for recovering the phaseform from the phase-modulated carrier, a receiving-filter generator in communication with the demodulator for generating a receiving-filter response corresponding to the selected transmitting-filter response, a mixer in communication with the demodulator and the receiving-filter generator for filtering the phaseform with the receiving-filter response, the mixer generating a weighted output representative of the combination of transmitting-filter responses weighted by the receiving-filter response, and an accumulator in communication with the mixer and adapted to accumulate the weighted output over a transmission interval, thereby generating a signal representative of the selected symbol.
- 16. The receiver of claim 15 wherein the receiving-filter generator is adapted to generate a receiving-filter response shift-orthogonal to the selected transmitting-filter response.
- 17. The receiver of claim 15 wherein the receiving-filter generator is adapted to generate a receiving-filter response shift-orthonormal to the selected transmitting-filter response.
- 18. The receiver of claim 15 wherein the receiving-filter generator is adapted to generate a receiving-filter response shift-biorthogonal to the selected transmitting-filter response.
- 19. The receiver of claim 15 wherein the accumulator is adapted to sum the weighted output at each of a plurality of times in the transmitting interval.
- 20. The receiver of claim 15 wherein the accumulator is adapted to integrate the weighted output during the transmitting interval.
- 21. A transmitter for encoding a first symbol and a second symbol on a phase component of a carrier signal, the first symbol being transmitted during a first interval, the second symbol being transmitted during a second interval partially overlapping the first interval, the transmitter comprising
a first transmitting-filter-response generator for generating a first transmitting-filter-response having finite duration in a first interval, a first mixer connected to receive the first transmitting-filter-response and the first symbol, thereby generating a first weighted signal, a second transmitting filter response generator for generating a second transmitting filter response having finite duration in a second interval partially overlapping the first interval, a second mixer connected to receive the second transmitting-filter-response and the second symbol, thereby generating a second weighted signal, a combiner in communication with at least the first mixer and the second mixer for generating a modulating quantity on the basis of at least the first weighted signal and the second weighted signal, and a phase modulator in communication with the combiner for modulating the phase component of the carrier signal on the basis of the modulating quantity.
- 22. The transmitter of claim 21 wherein the combiner is adapted to sum the first weighted signal and the second weighted signal.
- 23. The transmitter of claim 21 wherein the phase modulator is adapted to set the phase component of the carrier signal equal to the modulating quantity.
- 24. The transmitter of claim 21 wherein the first and second transmitting-filter-responses generators are adapted to generate first and second transmitting-filter-response that are shift biorthogonal to corresponding first and second receiving filter responses generated by a receiving filter generator in a receiver.
RELATED APPLICATIONS
[0001] This application claims priority from U.S. Provisional Application No. 60/114,274 filed on Dec. 30, 1998 which is hereby incorporated by reference.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60114274 |
Dec 1998 |
US |
Divisions (1)
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Number |
Date |
Country |
Parent |
09469581 |
Dec 1999 |
US |
Child |
09753439 |
Jan 2001 |
US |