Reception of signals with unpredictable transmission properties in wireless m2m networks

Abstract

A method and apparatus for reception of signals with unpredictable transmission properties enabling physically secure, unscheduled and interference-resistant communication over machine-to-machine (M2M) networks is claimed. A physical structure employs combinations of unpredictable physical dwells, spreading vectors, and selection of intended receivers. Reception methods employ blind detection and signal separation techniques, which can detect and extract transmissions intended for a receiver, and excise transmissions not intended for that receiver, as part of the despreading procedure, even if received at much higher power levels than the intended transmissions. The resultant receiver eliminates the ability for an adversary to predict and override M2M transmissions; allows reception of ad-hoc transmissions in dense environments without scheduling, CSMA/CA protocols, or feedback paths enabling scheduling, and allows macrodiverse reception of transmissions at networks of connected receivers, thereby providing additional efficiency andsecurity improvements by exploiting the route diversity of the network.