Pulse or digital communications – Transmitters – Angle modulation
Patent
1998-07-20
2000-07-04
Bocure, Tesfaldet
Pulse or digital communications
Transmitters
Angle modulation
332103, H04L 2720
Patent
active
060849215
ABSTRACT:
An improved method and system for generating quadrature phase shift keying signals for use in data transmission is provided. A pair of oscillators are slaved to the transmit frequency and produce two quadrature signal components with the same frequency but 90 degrees out of phase. The two signal components are carried to separate bi-phase switches by mirrored waveguides. Each bi-phase switch has a reflective waveguide coupler which directs the received signal into a waveguide terminated by a hard short and has a controllable shorting plane spaced approximately one-quarter wavelength from the termination point. The shorting planes are controlled by the output data signals and each introduces a 180 degree phase shift in the respective signal component when activated. The reflective couplers direct the selectively phase shifted signal components to an in-phase combiner, where they are combined to produce the quadrature phase shift keyed output signal.
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Bocure Tesfaldet
Channel Master LLC
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