Abstract: A portable sensing and telematics device senses one or more conditions with respect to a vehicle and/or its occupant(s) and can communicate regarding, or in response to, the sensed condition to a remote entity (e.g., emergency responders, law enforcement agencies, other entities that monitor vehicle occupants or usage). An exemplary device can be integrated in, for example, a cigarette lighter adapter (CLA) configured to be connected to a vehicle cigarette lighter socket or auxiliary power socket. The portable sensing and telematics device can be connected to a tethered smartphone, interface with an in-vehicle modem or cellular phone, or incorporate smartphone or similar functionality within. Other form factors are possible. An exemplary device can be used in a wide variety of emergency sensing and response applications, as well as various monitoring applications and scenarios.

Abstract: Systems and methods are presented for transmitting additional data over preexisting differential COFDM signals by modulating existing data carriers with a phase and an amplitude offset. In exemplary embodiments of the present invention, additional data capacity can be achieved for an COFDM signal which is completely backwards compatible with existing satellite broadcast communications systems. In exemplary embodiments of the present invention additional information can be overlayed on an existing signal as a combination of amplitude and phase offset from the original QPSK symbols, applied for each information bit of the overlay data. With two additional levels of modulation, a receiver can demodulate the information from each of the previous stages and combine the information into a suitable format for soft decoding. The first stage of demodulation will be recovery of overlay data from the amplitude modulated D8PSK.