Patent ID: 6229992
Filing Date: 2001-05-08
Classification: H04B

Abstract:
A radio transceiver, comprising:at least one antenna arrangement, for receiving signals and for transmitting signals;means for receiving a baseband input signal;a local oscillator operating at a local oscillator frequency;a mixer for upconverting the input signal to a transmission frequency;means for sampling the signals to be transmitted;means for generating cancellation signals from the sampled signals to be transmitted;means for subtracting the cancellation signals from the received signals to produce cancelled received signals for processing;means for sampling the cancelled received signals;a mixer that receives the local oscillator signal as one input and receives the sampled cancelled received signals at another input so as to downconvert the sampled cancelled received signals to baseband or near baseband;digital signal processing means, responsive to the downconverted sampled cancelled received signals and the baseband input signal, for controlling the generation of the cancellation signals by controlling the signal vector thereof in order to minimise the amount of the signals to be transmitted appearing in the downconverted sampled cancelled received signals; andmeans for processing the cancelled received signals.