Polynomial Temperature Compensation Algorithms for Sub-GHz Preamble Window Minimization
Polynomial compensation reduces sub-GHz receiver preamble listen windows by converting crystal thermal drift into predictable fixed-point timer corrections.
Wake-on-Radio
Meaning
Low power listening modes allow a transceiver to remain in a dormant state while periodically checking for incoming signals. Implementing wake-on-radio enables a device to respond to asynchronous events without keeping the entire receiver active at all times. This technique is essential for battery operated devices that must remain reachable.
Carrier Sensing
Detection of energy on the channel occurs during brief, scheduled intervals. In a wake-on-radio configuration, the radio hardware performs a quick check of the received signal strength or a preamble search before deciding whether to wake the host processor. If no valid signal is found, the device immediately returns to sleep to conserve power and avoid draining the battery during periods of high environmental noise or interference.
High sensitivity settings allow for the detection of weak signals but may lead to more frequent false wakeups.
Preamble Requirement
Transmitters must send a lead-in signal long enough to cover the sleep interval of the receiver. For wake-on-radio to function reliably, the length of the transmitted preamble must exceed the period between the receiver’s checks. This ensures that the receiver will always be awake for at least one portion of the incoming synchronization sequence.
Battery Optimization
Energy savings are maximized by reducing the frequency and duration of the listening windows. The configuration of wake-on-radio involves a trade off between how quickly a device responds and how long its battery will last. Optimizing these parameters for the specific traffic patterns of an application is a primary task for system integrators.