Abstract: A cellular network is controlled such that time slots of transmissions from base stations with the same operating frequency are synchronized. Moreover, adjacent base stations using the same frequency are controlled such that, at any given time, they are transmitting different sync words.

Abstract: A base station monitors signals received from cochannel interferers, and detects the air frame positions of the interfering transmissions. The base station then adjusts the air frame position of its own transmissions such that it minimizes the possibility of interference with the cochannel interferers.

Abstract: A log polar digital filter for processing a digitized log polar signal that is a magnitude signal (r.sub.in) and an angle signal (PHI.sub.in), has a first converter for converting the log polar signal into a converted linear Cartesian signal that includes an in-phase signal (I.sub.in) and a quadrature signal (Q.sub.in). A linear Cartesian digital filter, coupled to the first converter, generates a filtered linear Cartesian signal from the converted linear Cartesian signal. The first converter may adapt a linearization of r.sub.in and compensate for gain errors introduced in an analog circuit that supplies a signal from which the digitized log polar signal is derived. In another feature, a second converter may also be provided for converting the filtered linear Cartesian signal into a filtered log polar signal that includes a filtered magnitude signal (r.sub.filt) and a filtered angle signal (PHI.sub.filt).