Nortel Networks Corporation

Alan J Carter

Norman P Secord

Jian Cui

Derek Stephen Hilborn

Wayne Dam

An apparatus for performing collision resolution in a digital control channel which includes at least two antennas for receiving interfering signals, wherein each of the signals is associated with a network user, and a processor for processing the signals received by the antennas. The processor performs blind channel estimate calculations on the interfering signals to obtain channel information and to obtain a second signal. The second signal is selected for processing by a communication network.

Apparatus and methods for performing collision resolution for digital control channels

Co-channel interference in an AMPS (Advanced Mobile Phone System) receiver, having at least two diversity paths each for producing a received signal, is reduced by determining weights for combining the received signals in dependence upon the received signals and a reference signal, combining the received signals in accordance with the determined weights to produce a combined received signal, demodulating the combined received signal, and producing the reference signal by amplitude limiting the combined received signal or modulating the demodulated signal or a signal derived from the demodulated signal, so that the reference signal is produced from the combined received signal with amplitude variations reduced and with frequency variations of the desired signal substantially maintained.

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Ottawa, Canada

Alan J Carter