difference between In-band jamming and Out-band jamming
This page on In-band jamming vs Out-band jamming covers difference between In-band jamming and Out-band jamming. The other difference between various terms are provided here.
Jamming signals originate from in-band and out-band sources of frequency. Also refer RF Jammer for more information.
In band jamming signal
In general, with in-band jamming, the signal frequency of jammer will be very close to the RF center frequency of the transmitter under test. The figure-1 depicts the case for GPS transmitter. This in-band jamming signals are mainly caused due to harmonics, bus systems etc.
Following steps are followed to reduce the effects of in-band jamming or to avoid generation of
in-band jamming signals.
• Maintain good grounding in the circuit design
• Shield as much as possible to avoid any unwanted radiation
• Do proper layout optimization
• Use filters as much as possible wherever needed such as at the outputs of RF mixers or any non-linear components.
• Place GPS antenna very close to the circuit output port
• For multimode modem, add BPFs before handset antenna
Out band jamming signal
In general, with out-band jamming, the signal frequency of jammer will be different to the RF center frequency of the transmitter under test. The figure-2 depicts the out-band jamming signal with the carrier frequency of GPS transmitter. This out-band jamming signals are mainly caused due to nearby wireless transmitters of the other sytems such as GSM, WCDMA, LTE, WLAN, bluetooth etc.
To avoid out-band jamming generation, good grounding rules are followed in the design. Moreover filters such as SAW or Bandpass ceramic are used at the antenna input of the GPS receiver.
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