Transmitter receiver leakage reduction in a full duplex system without the use of a duplexer

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United States of America Patent

PATENT NO 9923593
SERIAL NO

14774296

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Abstract

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A transceiver suitable for frequency duplex division communication is disclosed. The transceiver comprises a transmitter, wherein the transmitter comprises a power amplifier; a receiver; an auxiliary power amplifier which is arranged to provide a controllable phase shift and gain output; a first filter arranged at an output of the power amplifier arranged to attenuate frequencies at a receiving frequency of the receiver; a second filter arrangement at an output of the auxiliary power amplifier arranged to attenuate frequencies at a receiving frequency of the receiver; and a signal transmission arrangement. The signal transmission arrangement is arranged to transmit signals provided from the transmitter through its power amplifier to a radio frequency, RF, connecting point, receive signals from the RF connecting point and provide the signals to the receiver, and provide signals from the auxiliary amplifier towards an input of the receiver. The transceiver also comprises a controller, wherein the controller is arranged to control the auxiliary power amplifier output to provide a signal that has a phase and amplitude in relation to the output of the power amplifier of the transmitter such that the transmitter contribution to the signal at the input of the receiver is suppressed. A method of controlling the transceiver, a communication device and computer program are also disclosed.

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Patent Owner(s)

Patent OwnerAddress
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)STOCKHOLM SWE STOCKHOLM

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Andersson, Stefan Lund, SE 128 2200
Din, Imad ud Lund, SE 25 410
Eckerbert, Daniel Landskrona, SE 7 143
Sjöland, Henrik Lund, SE 95 469
Wernehag, Johan Malmö, SE 19 403

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