Spread intermediate frequency radio receiver with adaptive spurious rejection
AssigneeRockwell International Corporation
InventorChristopher J. Swanke
Life of this patent
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Abstract
A radio receiver in which the received signal is spread and subsequently despread in order to identify unwanted signals. One embodiment of the present invention is comprised of a frequency-hopping spreading synthesizer that operates in synchronization with a despreader synthesizer such that unwanted signals are effectively suppressed based upon different spreading characteristics of the desired and undesired signals. Use of a logic device, in one case a digital signal processor, in combination with a state-level monitor allows for the reconfiguring of the receiver such that a state containing a large interferer can be removed from further signal processing.
Claims11
A radio receiver comprising:
- an input stage for receiving a radio signal composed of a desired signal in a first selected frequency range and an undesired disturbance signal;
- paired spreading and despreading synthesizers coupled to the radio signal;
- a detector for identifying undesired signals within operating parameters of the receiver;
- and
- a processor for interpreting an output signal from the detector and reconfiguring the receiver to inhibit the undesired disturbance signals.
A radio receiver comprising:
- an input stage having an antenna for receiving a radio signal composed of a desired signal in a first selected frequency range and an undesired disturbance signal;
- a first mixer coupled to said input stage for converting the received radio signal into a frequency signal in a second selected frequency range;
- a signal spreader coupled to the first mixer for spreading a desired intermediate frequency about a selected center frequency;
- a pair of mixers forming a first channel for processing the in-phase component of the first mixer output signal and a second channel for processing the quadrature-phase component of the first mixer output signal;
- a signal despreader for removing the spreading introduced to the first mixer coupled to the paired mixers;
- and
- a synchronizer coupled to the spreader and the despreader to account for timing differences and delay equalization.
Dependencies are inferred from the claim text.