Abstract: Methods for reliable broadcast transmission in a vehicular environment comprise providing a dynamic local map for a driven vehicle, selecting a pivot vehicle based on the local map and optionally on a radio frequency coverage limit and performing a RTS/CTS handshake between the driven vehicle and the pivot vehicle. The CTS message by the pivot vehicle clears the way for the driven vehicle to broadcast data to other vehicles in the environment.

Abstract: Embodiments of a method for OFDM frame boundary detection in a vehicular multipath channel include use of a maximal channel energy instead of a strongest path for detecting a frame boundary. A sample of OFDM data inputs is processed using long preamble local copy correlation and integration to obtain a channel energy which sums all paths of the multipath. A plurality of such channel energies obtained within a given time period are searched for a maximal channel energy, which, when found, is used to detect the frame boundary.

Abstract: Methods for pedestrian unit (PU) communication activity reduction in pedestrian-to-vehicle communication networks include obtaining safety risk information for a pedestrian at risk for involvement in an accident and using the risk information to adjust a PU communication activity. In some embodiments, the activity reduction is achieved without implementing understanding of surroundings. In other embodiments, the activity reduction is based on risk assessment provided by vehicles. In some embodiments, the activity reduction includes PU transmission reduction. In some embodiments the transmission activity reduction may be followed by reception activity reduction for overall power consumption reduction.

Abstract: Methods and apparatuses for adjacent channel interference mitigation during the acquisition phase in OFDM communications use a Discrete Fourier Transform (DFT) to detect the energy of a received channel without adding latency. In particular embodiments, the communications are vehicular OFDM communications and the DFT is a sliding DFT of variable length. In a typical acquisition procedure, RF gain is set based on received total energy, which includes energies of the received and adjacent channels. A modified state machine waits until the energy of a received channel is detected, then the RF gain is adjusted to fulfill an enhanced adjacent channel rejection criterion requirement.

Abstract: A dynamic RF matrix emulator uses digital switching to emulate the switching behavior of hundreds of wireless terminals. The emulator includes a switching matrix with channels formed between terminal pairs, digital front ends for coupling terminals digitally to the switching matrix, and a channel database having entries representing attenuation values which can be changed in time, the attenuation values correlated with movement of vehicles provided by a traffic simulator. Channel behavior is defined by temporal attenuation values obtained from the database. The digital switching is controlled through a digital communication protocol.

Abstract: Methods for reliable broadcast transmission in a vehicular environment comprise providing a dynamic local map for a driven vehicle, selecting a pivot vehicle based on the local map and optionally on a radio frequency coverage limit and performing a RTS/CTS handshake between the driven vehicle and the pivot vehicle. The CTS message by the pivot vehicle clears the way for the driven vehicle to broadcast data to other vehicles in the environment.