Spread intermediate frequency radio receiver with adaptive spurious rejection
First Claim
Patent Images
1. 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.
1 Assignment
0 Petitions
Accused Products
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.
124 Citations
11 Claims
-
1. 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.
-
-
2. 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. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
-
Specification