Motorola Corporation

Justin N Annes

Robert Szopko

Gregory T Nash

An interference cancellerand corresponding method thereof operates to reduce the level of an interfering signal and includes a circulatorcomprising a transmitter port, a receiver port and an antenna port, a transmission linecomprising a first end coupled to the transmitter port and a second end for coupling to a signal source; and a circuit, having an input coupled to the receiver portand an output coupledto the transmission line, for providing a phase shifted version of a signal coupled to the input at the output, wherein an interfering signal at the antenna port is reverse coupled to the transmission line by the circulator and coupled to the input of the circuit so as to reduce an amplitude of the interfering signal at the second endof the transmission line. The interference canceller concepts may advantageously be used in a single transmitter version or in a multiple transmitter version (FIG.).

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Round Lake, IL, United States of America

Justin N Annes