초록 ▼

A RF receiver that comprises: (i) a complex mixer for converting a version of the RF signal to a complex baseband signal comprising an in-phase component and a quadrature component; (ii) one or more analog-to-digital converters (ADCs) connected to the complex mixer for digitizing the in-phase compon

A RF receiver that comprises: (i) a complex mixer for converting a version of the RF signal to a complex baseband signal comprising an in-phase component and a quadrature component; (ii) one or more analog-to-digital converters (ADCs) connected to the complex mixer for digitizing the in-phase component and the quadrature component of the complex baseband signal; and (iii) a digital signal processor (DSP) connected the one or more ADCs. The DSP is programmed to mitigate interference in the complex baseband signal by a process that comprises the steps of: (i) performing at least one cross correlation operation involving L-length segments of the digitized in-phase and quadrature components of the complex baseband signal; and (ii) concatenating the cross-correlated L-length segments of the digitized in-phase and quadrature components of the complex baseband signal to produce digitized interference mitigated in-phase and quadrature components of the complex baseband signal.

대표청구항 ▼

1. A RF receiver comprising: a complex mixer for converting a version of an input RF signal to an input complex baseband signal comprising an input in-phase component and an input quadrature component;one or more analog-to-digital converters (ADCs) connected to the complex mixer for digitizing the i

1. A RF receiver comprising: a complex mixer for converting a version of an input RF signal to an input complex baseband signal comprising an input in-phase component and an input quadrature component;one or more analog-to-digital converters (ADCs) connected to the complex mixer for digitizing the input in-phase component and the input quadrature component of the input complex baseband signal; anda digital signal processor (DSP) connected the one or more ADCs, wherein the DSP is programmed to mitigate interference in the input complex baseband signal by: performing at least one cross correlation operation involving L-length segments of the digitized input in-phase and input quadrature components of the input complex baseband signal; andconcatenating the cross-correlated L-length segments of the digitized input in-phase and input quadrature components of the input complex baseband signal to produce digitized interference mitigated in-phase and quadrature components of the input complex baseband signal. 2. The receiver of claim 1, wherein the at least one cross correlation operation comprises two or more iterative cross correlation operations involving the L-length segments of the digitized input in-phase and input quadrature components of the input complex baseband signal. 3. The receiver of claim 1, wherein the DSP is programmed to construct a reference signal for mitigating the interference by clipping and filtering the digitized input in-phase and input quadrature components of the digitized complex baseband signal. 4. The receiver of claim 2, wherein the DSP is programmed to mitigate interference in the digitized complex baseband signal by independently clipping the digitized input in-phase and input quadrature components of the input complex baseband signal prior to performing two or more iterative cross correlation operations. 5. The receiver of claim 1, wherein the DSP is further programmed to demodulate the digitized interference mitigated in-phase and quadrature components of the input complex baseband signal to produce a demodulated digital signal. 6. The receiver of claim 4, wherein the DSP is further programmed to demodulate the digitized interference mitigated in-phase and quadrature components of the input complex baseband signal to produce a demodulated digital signal. 7. The receiver of claim 6, wherein the DSP is programmed to demodulate the digitized interference mitigated in-phase and quadrature components of the input complex baseband signal using a digital FM demodulation scheme. 8. The receiver of claim 5, wherein the DSP is further programmed to compute an estimate of an amplitude of one or more tones present in the demodulated digitized signal. 9. The receiver of claim 7, wherein the DSP is further programmed to compute an estimate of an amplitude of one or more tones present in the demodulated digitized signal. 10. The receiver of claim 1, wherein the DSP is further programmed to compute an estimate of an amplitude of one or more tones present in the input complex baseband signal. 11. The receiver of claim 8, wherein the DSP is programmed to compute the estimate of the amplitude of a first tone present in the demodulated digitized signal by a process that comprises the steps of: segmenting the demodulated digitized signal into a plurality of segments;cross-correlating the plurality of segments of the demodulated digitized signal with sampled versions of in-phase and quadrature components the first tone to generate amplitude estimates of the in-phase and quadrature components of the first tone for each of the plurality of segments;weighting each of the plurality of segments of the in-phase and quadrature components of the first tone; andsumming the weighted segments for the in-phase and quadrature components of the first tone. 12. The receiver of claim 11, wherein: the DSP further is programmed to estimate the signal-to-interference plus noise ratio for each of the plurality of segments; andweighting each of the plurality of segments of the in-phase and quadrature components of the first tone comprises weighting each of the plurality of segments of the in-phase and quadrature components of the first tone with a weight based on the signal-to-interference plus noise ratio for the segment. 13. The receiver of claim 9, wherein the DSP is programmed to compute the estimate of the amplitude of a first tone present in the demodulated digitized signal by a process that comprises the steps of: segmenting the demodulated digitized signal into a plurality of segments;cross-correlating the plurality of segments of the demodulated digitized signal with sampled versions of in-phase and quadrature components the first tone to generate amplitude estimates of the in-phase and quadrature components of the first tone for each of the plurality of segments;weighting each of the plurality of segments of the in-phase and quadrature components of the first tone; andsumming the weighted segments for the in-phase and quadrature components of the first tone. 14. The receiver of claim 13, further comprising estimating the signal-to-interference plus noise ratio for each of the plurality of segments; andwherein weighting each of the plurality of segments of the in-phase and quadrature components of the first tone comprises weighting each of the plurality of segments of the in-phase and quadrature components of the first tone with a weight based on the signal-to-interference plus noise ratio for the segment. 15. A method comprising: receiving, by an antenna of a receiver, an input modulated RF signal;converting, by a complex mixer of the receiver, a version of the input modulated RF signal to an input complex baseband signal comprising an input in-phase component and an input quadrature component;digitizing the input in-phase component and the input quadrature component of the input complex baseband signal with one or more analog-to-digital converters (ADCs) connected to the complex mixer; andmitigating interference in the digitized complex baseband with a signal a digital signal processor (DSP) connected the one or more ADCs by: performing at least one cross correlation operation involving L-length segments of the digitized input in-phase and input quadrature components of the input complex baseband signal; andconcatenating the cross-correlated L-length segments of the digitized input in-phase and input quadrature components of the input complex baseband signal to produce digitized interference mitigated in-phase and quadrature components of the input complex baseband signal. 16. The method of claim 15, wherein mitigating the interference further comprises clipping and filtering the digitized input in-phase and input quadrature components of the input complex baseband signal. 17. The method of claim 15, further comprising digitally demodulating, by the DSP, the digitized interference mitigated in-phase and quadrature components of the input complex baseband signal to produce a demodulated digital signal. 18. The method of claim 17, further comprising computing, by the DSP, an estimate of an amplitude of one or more tones present in the demodulated digitized signal. 19. The method of claim 18, wherein computing the estimate of the amplitude of one or more tones present in the demodulated digitized signal comprises computing the estimate of the amplitude of a first tone present in the demodulated digitized signal by a process that comprises the steps of: segmenting the demodulated digitized signal into a plurality of segments;cross-correlating the plurality of segments of the demodulated digitized signal with sampled versions of in-phase and quadrature components the first tone to generate amplitude estimates of the in-phase and quadrature components of the first tone for each of the plurality of segments;weighting each of the plurality of segments of the in-phase and quadrature components of the first tone; andsumming the weighted segments for the in-phase and quadrature components of the first tone. 20. The method of claim 19, further comprising estimating, by the DSP, the signal-to-interference plus noise ratio for each of the plurality of segments; and wherein weighting each of the plurality of segments of the in-phase and quadrature components of the first tone comprises weighting each of the plurality of segments of the in-phase and quadrature components of the first tone with a weight based on the signal-to-interference plus noise ratio for the segment. 21. The system of claim 3 wherein the reference signal is a scaled version of estimates of the input inphase and input quadrature components of the interference present in the input complex baseband signal.