Patent ID: 8861576
Filing Date: 2014-10-14
Classification: H04B,H04W,Y02D

Abstract:
1. A radio communication system, comprising a first radio communication device, which comprises: a first communication circuit configured to receive a communication request and to provide a wake-up signal upon receiving the communication request; wherein the first communication circuit comprises a first receiver circuit for demodulating and amplifying the communication request without using a radio frequency (RF) local oscillator; wherein the first receiver circuit comprises: a detector demodulator diode for demodulating the communication request, the detector demodulator diode comprising an output for providing a demodulated signal obtained from the communication request; a common base transistor amplifier comprising an input for receiving the demodulated signal obtained from the communication request, the input being at an emitter of the common base transistor amplifier; and a circuit for providing a bias current to the detector demodulator diode and the common base transistor amplifier, the circuit being connected in series with the detector demodulator diode and a base-emitter junction of the common base transistor amplifier to cause at least part of the bias current to flow through both the detector demodulator diode and the base-emitter junction of the common base transistor amplifier; wherein the first radio communication device further comprises a second communication circuit comprising a receiver, a transmitter, or a transceiver, having an operating state and a power saving state, wherein said second communication circuit switches from the power saving state to the operating state upon receiving the wake-up signal.