adjacent-channel interference

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adjacent-channel interference

[ə′jās·ənt ′chan·əl in·tər′fir·əns]
(communications)
Interference that is caused by a transmitter operating in an adjacent channel.
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A parameter named ACIR (adjacent channel interference ratio) is used to measure the overall ACI and defined as the ratio of the total power transmitted from an aggressor transmitter to the total interference power affecting a victim receiver in the adjacent channel.
Therefore, the strategy is to create cells which use every seventh channel to ameliorate the adjacent channel interference, and then try to use other techniques to increase the "frequency reuse" in the network.
To investigate adjacent channel interference, an interferer with 20 dB more power than the input signal and a carrier frequency 5 MHz above the input signal was used.
If [f.sub.1] and [f.sub.2] are two interference signals from alternative adjacent channel interference that have the same power level, the relationships between the second-order products are
where [p.sub.i] is the transmission power of link i, and [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] is the joint attenuation due to path loss and fading, while [??]([x.sub.i], a) is the defined adjacent channel interference coefficient, when [x.sub.i] = a, [??]([x.sub.i], a) = 1, otherwise [??]([x.sub.i], a) = [gamma]([DELTA]f)/[gamma](0).
Co-channel and adjacent channel interference (ACI) are normal in mesh networks since neighboring radios can communicate on the same or adjacent channels and interfere with the channel under test.
Inversely, the total number of carriers that can be multiplexed into a single channel, knowing the required CTB interference level, can be calculated assuming that all of the interference signals are noncoherent and the bandwidth is, wide enough for all of the carriers to exist with acceptable adjacent channel interference.
Based on the analysis in [8] about the mutual interference between PU and SU, sidelobe suppression methods are proposed in [9,13] to reduce the adjacent channel interference to PU's band.
Due to the close channel bandwidths that digital cellular phones must work within as well as the frequency-hopping requirements of GPRS or EDGE, the mobile must not produce adjacent channel interference due to modulation and wideband noise.
Transmission delay, Doppler shift, multipath fading and adjacent channel interference are problems that must be dealt with in order to provide quality service to end users.
"Co-channel and adjacent channel interference evaluation for IMT-Advanced coexistence with existing fixed systems." RF and Microwave Conference, pp.65-69, Dec.2008.
Transmit range expectations, system losses and adjacent channel interference mean the PA must provide excess power.