Bandwidth efficient continuous phase modulation
First Claim
1. A method for generating a phase modulated, constant envelope transmit signal having continuous phase transitions between adjacent symbols representing different states, comprising:
- generating a stream of symbols having a sequence of symbol states;
identifying antipodal phase transitions between adjacent symbols representing different states;
controlling a phase rotation polarity of the continuous phase transitions between adjacent symbols having antipodal phase transitions such that a phase rotation polarity pattern of the antipodal phase transitions in the stream of symbols is uncorrelated with the sequence of symbol states; and
generating the constant envelope transmit signal from the stream of symbol states.
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Abstract
A technique for generating a phase modulated, constant envelope transmit signal having continuous phase transitions between adjacent symbols involves generating a stream of symbols having a sequence of symbol states and identifying antipodal phase transitions between adjacent symbols representing different states. The phase rotation polarity of the continuous phase transitions between adjacent symbols having antipodal phase transitions is controlled such that a phase rotation polarity pattern of the antipodal phase transitions in the stream of symbols is uncorrelated with the sequence of symbol states. The constant envelope transmit signal is then generated from the stream of symbols. The spectral profile of the constant envelope signal can be tailored by selection of the phase trajectory shape and the portion of the symbol over which the continuous phase transition occurs.
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Citations
20 Claims
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1. A method for generating a phase modulated, constant envelope transmit signal having continuous phase transitions between adjacent symbols representing different states, comprising:
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generating a stream of symbols having a sequence of symbol states; identifying antipodal phase transitions between adjacent symbols representing different states; controlling a phase rotation polarity of the continuous phase transitions between adjacent symbols having antipodal phase transitions such that a phase rotation polarity pattern of the antipodal phase transitions in the stream of symbols is uncorrelated with the sequence of symbol states; and generating the constant envelope transmit signal from the stream of symbol states. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for generating a phase modulated, constant envelope transmit signal having continuous phase transitions between adjacent symbols representing different states, comprising:
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a baseband signal generator to generate a stream of symbols having a sequence of symbol states, wherein at least some adjacent symbols representing different states have antipodal phase transitions therebetween; a phase rotation polarity pattern generator to control a phase rotation polarity of the continuous phase transitions between adjacent symbols having antipodal phase transitions such that a phase rotation polarity pattern of the antipodal phase transitions in the stream of symbols is uncorrelated with the sequence of symbol states; and an RF modulator to generate the constant envelope transmit signal from the stream of symbol states. - View Dependent Claims (16, 17, 18, 19)
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20. One or more non-transitory computer readable storage media having instructions encoded thereon that, when executed by a processor, cause the processor to:
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generating a stream of symbols having a sequence of symbol states for a phase modulated signal having continuous phase transitions between adjacent symbols representing different states; identifying antipodal phase transitions between adjacent symbols representing different states; controlling a phase rotation polarity of the continuous phase transitions between adjacent symbols having antipodal phase transitions such that a phase rotation polarity pattern of the antipodal phase transitions in the stream of symbols is uncorrelated with the sequence of symbol states; and controlling a modulator to generate a constant envelope transmit signal from the stream of symbol states.
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Specification