Abstract: A communication system utilizes rotated bursts of voice channels to implement mobile assisted handoff (MAHO). Mobile stations measure the voice channels of adjacent cells as hopping frequencies are rotated from frame-to-frame of the communication system. Measurement of the voice channels of adjacent cells can be performed by mobile stations during timeslots subsequent to their receive and transmission so that measurement during a timeslot dedicated to a control channel related to the adjacent cells is not necessary.

Abstract: A sampled input signal is quantized to lie within a predetermined magnitude range. The quantized input signal is coupled to a bandpass filter which selects the digital signal to be processed. The bandlimited signal is then coupled to a feedback automatic gain control circuit which removes the slow variations in the envelope of the input signal. The output of the feedback AGC circuit is then coupled to a feedforward AGC circuit which removes the fast variations in the envelope of the input signal. The feedback AGC and the feed forward AGC circuits share a common envelope detector, that is composed of a squaring operation and low pass filter operation. The feedback AGC circuit also reduces the dynamic range of the input signal which is required of the feed forward AGC circuit. The processed signal is then demodulated with a quadrature FM detector. The output of the FM detector may be low pass filtered, and coupled to a D/A converter to produce an audio message signal.