Multi-protocol modulator
First Claim
1. A modulator capable of supporting two or more different modes of operation, each mode of operation corresponding to a different type of modulation, the modulator comprising:
- an m-level phase shift keying (m-PSK) modulator including an input for receiving a serial data stream, and an output;
a phase rotator operatively coupled to the output of the m-PSK modulator for rotating a phase of an output signal generated by the m-PSK modulator by at least one of a first predetermined value corresponding to a first modulation type in a first mode of operation and a second predetermined value corresponding to a second modulation type in a second mode of operation;
a pulse shaping filter operatively coupled to the phase rotator; and
a controller operatively coupled to the phase rotator for selectively switching the modulator between the first and second modes of operation.
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Accused Products
Abstract
A multi-protocol modulator capable of supporting two or more different modes of operation, each mode of operation corresponding to a different type of modulation, comprises an m-level phase shift keying (m-PSK) modulator which receives a serial input data stream and maps data contained therein into a constellation including m equidistant phases in accordance with a predetermined mapping scheme. The m-PSK modulator is shared by at least two different modulation protocols by allowing the mapping scheme to be selectively changed depending upon the modulation protocol used. The multi-protocol modulator further includes a phase rotator operatively coupled to the output of the m-PSK modulator. The phase rotator selectively rotates the phase of the m-PSK signal by a predetermined phase rotation value. The phase rotator is shared by the two or more modulation protocols by allowing the phase rotation value to be selectively modified depending upon the modulation protocol used. A phase rotated signal is then passed through a pulse shaping filter having a linearized Gaussian response.
58 Citations
23 Claims
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1. A modulator capable of supporting two or more different modes of operation, each mode of operation corresponding to a different type of modulation, the modulator comprising:
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an m-level phase shift keying (m-PSK) modulator including an input for receiving a serial data stream, and an output;
a phase rotator operatively coupled to the output of the m-PSK modulator for rotating a phase of an output signal generated by the m-PSK modulator by at least one of a first predetermined value corresponding to a first modulation type in a first mode of operation and a second predetermined value corresponding to a second modulation type in a second mode of operation;
a pulse shaping filter operatively coupled to the phase rotator; and
a controller operatively coupled to the phase rotator for selectively switching the modulator between the first and second modes of operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19)
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13. A semiconductor device for supporting two or more different types of modulation, the semiconductor device comprising:
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a first modulator for performing a first type of modulation of an input data stream, the first modulator including one or more sub-circuits;
a second modulator for performing a second type of modulation of the input data stream, the second modulator including at least one sub-circuit that is common to the first modulator, the common sub-circuit operating in at least one of a first mode of operation corresponding to the first type of modulation and a second mode of operation corresponding to the second type of modulation; and
a controller operatively coupled to the first and second modulators, the controller being responsive to at least one control signal for selectively switching between one of at least the first and second modes of operation.
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20. A method for selectively modulating a signal in one of at least a first modulation type and a second modulation type, the method comprising the steps of:
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providing an m-level phase shift keying (m-PSK) modulator, the m-PSK modulator operating in at least one of a first mode wherein the m-PSK modulator employs a first phase mapping corresponding to the first modulation type and a second mode wherein the m-PSK modulator employs a second phase mapping corresponding to the second modulation type;
modulating an input serial data stream using the m-PSK modulator in one of the first mode or the second mode of operation and generating an m-PSK-modulated signal;
rotating a phase of the m-PSK-modulated signal by one of a first predetermined phase rotation value in the first mode of operation and a second predetermined phase rotation value in the second mode of operation and generating a phase-rotated signal; and
filtering the phase-rotated signal using a pulse shaping filter. - View Dependent Claims (21, 22, 23)
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Specification