Method and sensor for detecting the presence of co-channel jamming

Patent metadata

Field	Value
Publication number	US-10608759-B2
Application number	US-201816488997-A
Country	US
Kind code	B2
Filing date	Mar 29, 2018
Priority date	Mar 31, 2017
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

A method for detecting co-channel interference in a frequency-modulated multiplexed radio signal, the method including verifying that the multiplexed radio signal has a symmetric passband; detecting and counting a plurality of positive noise peaks and a plurality of negative noise peaks in the multiplexed radio signal during a predetermined measurement duration; calculating a rate of positive or negative noise peaks among the plurality of peaks; and determining a score characteristic of a probability that co-channel interference exists in the multiplexed radio signal on the basis of the rate of positive or negative noise peaks.

First claim

The invention claimed is:

1. A method for detecting co-channel interference in a frequency-modulated multiplexed radio signal, said method comprising:
verifying that said multiplexed radio signal has a symmetric passband;
detecting and counting a plurality of positive noise peaks and a plurality of negative noise peaks in said multiplexed radio signal during a predetermined measurement duration;
calculating a rate of positive or negative noise peaks among said plurality of peaks; and
determining a score characteristic of a probability that co-channel interference exists in said multiplexed radio signal on the basis of said rate of positive or negative noise peaks.

2. The method as claimed in claim 1 , wherein a positive or negative noise peak is taken into account only if said multiplexed radio signal has a symmetric passband.

3. The method as claimed in claim 2 , comprising a prior step of comparing the signal-to-noise ratio of the multiplexed radio signal with a predetermined threshold, a positive or negative noise peak being taken into account only if said signal-to-noise ratio in said multiplexed radio signal is greater than said predetermined threshold, said predetermined threshold preferably being equal to 20 dB.

4. The method as claimed in claim 1 , comprising a prior step of comparing the signal-to-noise ratio of the multiplexed radio signal with a predetermined threshold, a positive or negative noise peak being taken into account only if said signal-to-noise ratio in said multiplexed radio signal is greater than said predetermined threshold, said predetermined threshold preferably being equal to 20 dB.

5. The method as claimed in claim 1 , wherein said predetermined measurement time is equal to 128 ms, plus or minus 10 ms.

6. The method as claimed in claim 1 , wherein said score is determined as being equal to:

1
-

K
⨯

abs
⁡

(

N
mean
+

-

N
mean
-

)

N
mean
v

where N mean + is the rate of positive noise peaks averaged over the predetermined measurement duration, N mean − is the rate of negative noise peaks averaged over the predetermined measurement duration, N mean v is the total number of noise peaks taken into account, and K is a scale factor to be determined.

7. The method as claimed in claim 1 , wherein the score characteristic of a probability that co-channel interference exists is determined only if the number of positive or negative noise peaks taken into account is greater than a predetermined threshold, preferably equal to 48.

8. A co-channel interference detection system, comprising a computer having computing means and a memory space, and means for detecting positive and negative noise peaks in a multiplexed radio signal, said computing means, the memory space, and said means for detecting positive and negative noise peaks being designed to implement the method as claimed in claim 1 .

9. A radio receiver comprising a co-channel interference detection system as claimed in claim 8 .

10. A motor vehicle comprising a radio receiver as claimed claim 9 .

Assignees

• Continental Automotive France
• Continental Automotive Gmbh

Inventors

• Lin Chao

Classifications

• H04B1/1027 Primary

  assessing signal quality or detecting noise/interference for the received signal · CPC title

• H04L27/14

  Demodulator circuits; Receiver circuits · CPC title

• H04B17/336 Primary

  Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] · CPC title