Wake-up radio having single bit correlators
AssigneeSilicon Laboratories Inc.
InventorsYi Shen Yeh, Yan Zhou, Marc Leroux
Life of this patent
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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.
Claims20
An apparatus comprising:
- an analog front end circuit to receive a radio frequency (RF) signal and to output a bit stream;
- and
- a digital circuit coupled to the analog front end circuit, the digital circuit comprising:
- a first correlator to receive a first portion of the bit stream and perform a correlation on the first portion to generate a first correlation result;
- a second correlator to receive a second portion of the bit stream and perform a correlation on the second portion to generate a second correlation result;
- and
- a controller coupled to the first correlator and the second correlator, wherein the controller is to enable the second correlator when the first correlation result exceeds a first threshold.
A method comprising:
- 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 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 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.
A system comprising:
- a first radio to receive and process an incoming radio frequency (RF) signal, the first radio comprising:
- a digital circuit to receive a bit stream obtained from the incoming RF signal, the digital circuit comprising:
- a scheduler to enable a core circuit for a scan window according to a predetermined interval;
- the core circuit coupled to the scheduler, the core circuit comprising:
- a first correlator to receive a first portion of the bit stream and perform a correlation on the first portion to identify a first portion of a sync word of a wake-up packet;
- a second correlator to receive a second portion of the bit stream and perform a correlation on the second portion to identify a second portion of the sync word of the wake-up packet, wherein the second correlator is to be enabled when a first correlation result exceeds a first threshold;
- and
- an averager circuit to decode another portion of the sync word;
- and
- a second radio coupled to the first radio, wherein in response to detection of the wake-up packet, the first radio is to send a wake-up signal to the second radio.
Dependencies are inferred from the claim text.