Receiver combiner for spatial diversity digital communications
AssigneeWavecom Electronics Inc.
InventorJ. Eric Salt
Life of this patent
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Abstract
Apparatus for and method of processing received signals for use with multiple antenna spatial diversity receivers used in a digital communications system. The receiver has received signal phase modulator apparatus for each diversity received signal. The phase modulator provides a two state phase perturbation of zero or pi radians, based on the carrier frequency, which is switched to modulate the phase of the received signal for a fifty percent duty cycle over a symbol period.
Claims14
Received signal processing apparatus for use with a spatial diversity receiver having a first receiving element producing a received signal and at least one physically separated diversity receiving element producing a received diversity signal comprising:
- phase perturbation means for each received diversity signal, to modulate the phase of the received diversity signal selectively by a predetermined phase adjustment in response to a control signal, producing a phase perturbed output signal;
- switching control means to produce a control signal for each phase perturbation means;
- and
- summing means to sum the received signal with all said phase perturbed output signals to produce a combined output signal.
Received signal processing apparatus for use with a spatial diversity receiver having at least two physically separated receiving elements each producing a received signal comprising:
- phase perturbation means for each receiving element to modulate the phase of the received signal selectively by a predetermined phase adjustment in response to a control signal, producing a phase perturbed output signal;
- switching control means to produce a control signal for each phase perturbation means;
- and
- summing means to sum the outputs from all said phase perturbation means to produce a combined signal output.
Dependencies are inferred from the claim text.