Abstract: A technique for reducing or eliminating effects of frequency and phase offset in a communications system includes implementing a demodulator having a Kalman filter based phase-locked loop for phase-shift keying or quadrature amplitude modulated signals. In an acquisition mode of operation, the Kalman filter based phase-locked loop continuously updates an error correction signal until an error between a received version of a predetermined signal transmitted using phase-shift keying or quadrature amplitude modulation and the predetermined signal is at or near zero. In a tracking mode of operation, the Kalman filter based phase-locked loop adjusts the error correction signal to maintain the error between the received signal and a predicted signal at or near zero.

Abstract: In one implementation, a method comprises: receiving, in a first radio, a radio frequency (RF) signal and processing the RF signal to provide a bit stream to a digital circuit of the first radio; enabling a first correlator of the first radio to detect at least a first portion of a sync word of a wake-up packet of the bit stream, and thereafter enabling a second correlator of the first radio to detect at least a second portion of the sync word; enabling an averager circuit to detect another portion of the sync word; and in response to detection of the sync word, disabling the first and second correlators and maintaining the averager circuit enabled.

Abstract: In an embodiment, an apparatus includes a baseband processor comprising: a packet generation circuit to generate a wake-up packet comprising information to cause a first receiver to trigger a wake-up of a second receiver; an encoder to encode the wake-up packet with Manchester encoding to output Manchester encoded on-off keying (MOOK) data; and a modulator coupled to the encoder to receive random data and modulate the random data. This modulated random data may be amplitude modulated with the MOOK data to realize a radio frequency (RF) signal comprising the MOOK data that is to be transmitted to one or more receivers.