A filter device (403) and method for suppressing effects of Adjacent-Channel Interference of a received signal in a Frequency-Division-Multiple-Access system by filtering a baseband signal (s) of the received signal. The filter device (403) comprises an interference filter (4032), which is a complex digital Single-Input-Multiple-Output, SIMO, filter that is adapted to simultaneously generate a first signal (x) filtered at an upper-frequency-band and a second signal (y) filtered at a lower-frequency-band, wherein the first signal (x) is separate from the second signal (y). The filter device (403) also comprises a selector (4033) adapted to select one of the signals (s, x, y) as the output from the filter device (403).