Patent ID: 8594153
Filing Date: 2013-11-26
Classification: H04B,H04L

Abstract:
1. A communications system comprising: a plurality of reporting devices, each reporting device including: wherein a code-phase of the spreading code used at each transmitter is independent of the code-phase used at other transmitters of the plurality of devices, actual transmission frequencies used by the transmitters of the plurality of reporting devices differ pseudo-randomly about the nominal frequency, and each transmitter is configured to transmit the state of the one or more sensors at a rate and duration that are selected to, provide a low likelihood of collision with transmissions from the other transmitters, thereby facilitating discrimination of receptions of the state of the one or more sensors of the plurality of reporting devices at a receiving system that operates asynchronous to any of the transmitters, based on energy detected at each reception frequency and code-phase corresponding to each non-colliding transmission.