Multi-rate quadrature phase shift keying
AssigneeRockwell Collins, Inc.
InventorBenjamin Peiffer
Life of this patent
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Abstract
A communication system and modulator for multiplexing two RF functions onto a shared antenna use a quadrature phase shift keying scheme (QPSK) scheme where each function is modulated using a binary PSK (BPSK) modulation and rotated onto a virtual axis before being combined. A transition enabler determines when the lower rate RF function is permitted to transition between binary states. When the higher rate RF function is repeated for a given cycle, the lower rate RF function may not interfere, and is allowed to transition. RF functions may be scaled according to the priority of each signal.
Claims20
A modulator comprising:
- a first symbol converter configured to receive a first signal;
- a second symbol converter configured to receive a second signal;
- a phase shifter configured to adjust the phase of the second signal;
- a combiner;
- and
- a transition enabling element,
- wherein:
- the transition enabling element is configured to delay a transition of the second signal;
- and
- the combiner is configured to combine a first converted symbol and a second converted symbol into an output with characteristics of a quadrature phase shift keying (QPSK) scheme.
A method of producing a combined output signal comprising:
- receiving a first signal via a first symbol converter;
- receiving a second signal via a second symbol converter;
- adjusting the phase of the second signal via a phase shifter;
- combining, via a combiner, a first converted symbol and a second converted symbol into an output with characteristics of a quadrature phase shift keying (QPSK) scheme;
- and
- delaying a transition of the second signal via a transition enabling element.
A communication system comprising:
- a modulator comprising:
- a first symbol converter configured to receive a first signal;
- a second symbol converter configured to receive a second signal;
- a phase shifter configured to adjust the phase of the second signal;
- a combiner;
- and
- a transition enabling element,
- wherein:
- the transition enabling element is configured to delay a transition of the second signal;
- and
- the combiner is configured to combine a first converted symbol and a second converted symbol into an output with characteristics of a quadrature phase shift keying (QPSK) scheme.
Dependencies are inferred from the claim text.