The FCC was probing allegations that its routers were not in "full compliance" with FCC regulations on power levels that prevent against adjacent-channel interference
The investigation aimed to evaluate performance of three different commercially available DVB-T receivers in the presence from strong adjacent-channel interference
of downlink LTE Frequency division duplex signal.
For links within interference range, the co-channel interference occurs from transmissions on the same channel, whereas the adjacent-channel interference
occurs from transmissions on adjacent and overlapping channels.
The techniques and hardware described are also applicable to sonar applications and adaptive digital filtering, which could reduce adjacent-channel interference
in communications systems, enabling increased use of the frequency spectrum.
The system performances are linked to adjacent-channel interference
ratio (ACIR) values.
But FDM is risky for multipoint, multiport applications because of its susceptibility to adjacent-channel interference
when line conditions are less than ideal.
Other design constraints are the result of regulatory bodies, which specify power spectral density masks defining the maximum allowable adjacent-channel interference
The main objectives of any smart antenna system are reduction of ISI, removal of CCI, mitigation of adjacent-channel interference
, enhancement of spectrum efficiency, improvement of BER, reduction of outage probability, improvement of transmission efficiency and reduction of hand-off rate and crosstalk.
By integrating all the components necessary for generating accurate co- and adjacent-channel interference
conditions, the emulator provides a single instrument solution to a problem that previously required more than three instruments.