Home of RF and Wireless Vendors and Resources

One Stop For Your RF and Wireless Need

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 band jamming

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

Out band jamming

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.

What is Difference between

difference between FDM and OFDM
Difference between SC-FDMA and OFDM
Difference between SISO and MIMO
Difference between TDD and FDD
Difference between 802.11 standards viz.11-a,11-b,11-g and 11-n
OFDM vs OFDMA
CDMA vs GSM
Bluetooth vs zigbee
Fixed wimax vs mobile

RF and Wireless Terminologies


Share this page

Translate this page