Abstract: A transceiver is disclosed having a baseband unit which outputs baseband signals and a modulator which modulates the baseband signals to output a modulated signal. A transmitter amplifier amplifies the modulated signal and outputs a transmit signal to a duplexer. The transceiver further includes a receive amplifier which receives a receive signal from the duplexer, where the receive amplifier has a gain which is modulated by an envelope signal which is proportional to the transmit signal, such as being proportional to the power or square root of the power of the transmit signal. The envelope signal is provided by either the baseband unit or by an envelope detector which receives the output of the receive amplifier. The envelope signal may also be provided by a rectifier which rectifies the output of the receive amplifier.

Abstract: A differentiate and multiply based timing recovery in a quadrature demodulator. A quadrature-modulated signal is received and demodulated by quadrature mixing the received modulated signal with a local oscillator signal. In-phase and quadrature down-converted signals are sampled. The sampled signals are differentially detected to produce binary digits from symbols conveyed by the quadrature-modulated signal. Sampling is controlled by a symbol timing recovery signal derived from the in-phase and quadrature down-converted signal. Thereto, the respective in-phase and quadrature down-converted signals are differentiated with respect to time, the respective differentiated signals are multiplied by the quadrature and in-phase signals, respectively, and the multiplied signals are subtracted from each other so as to produce a difference signal. The difference signal controls the symbol timing recovery in that a clock signal controlling the timing of the sampling is locked to the difference signal.