Qpsk modulator or demodulator using subharmonic pump carrier...

Details Qpsk modulator or demodulator using subharmonic pump carrier... Qpsk modulator or demodulator using subharmonic pump carrier...

H - Electricity

04

L

329/1, 332/60

H04L 27/20 (2006.01) H04L 27/233 (2006.01)

Patent

CA 1253929

- 19 - A QPSK Modulator or Demodulator using Subharmonic Pump Carrier Signals Abstract The present invention relates to a QPSK modulator or demodulator for modulating two different input bit streams with a subharmonic pump carrier signal to produce an appropriately encoded QPSK output signal. The subharmonic pump carrier signal used is a submultiple of a predetermined microwave or millimeter- wave carrier frequency. The QPSK modulator or demodulator is capable of being fabricated on a planar substrate using appropriate stripline filters and a mixer diode in each of an in-phase and quadrature signal path. A fin line arrangement, also capable of fabrication on the substrate, can be used to introduce an appropriately phased subharmonic pump carrier signal into each of the in-phase and quadrature signal paths before each mixer diode. Each mixer diode mixes the associated data bit stream and one of the two appropriately phased pump carrier signals to produce separate output signals which modulate along separate orthogonal axes, which output signals are combined to produce the QPSK modulator output signal.

510066

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