Patent ID: 9621389
Date: 2017-04-11
CPC Classifications: H04L,H04W

Claim:
1. A method for introducing complementing training symbols into an a Orthogonal Frequency-Division Multiplexing (OFDM) frame in a vehicular communications system comprising: providing a transmitter that sends encrypted information from a first unit to a receiver of a specific second unit or a respective receiver of a number of second units and wherein fixed training symbols, which are implemented in a transmitter chip, are multiplexed with the information and transmitted to the receiver for channel estimation at the receiver side, and inserting the complementing training symbols at the transmitter side immediately after an logical link control (LLC) sub-layer so as to improve channel estimation, where the logical link control (LLC) sub-layer can be modified, and the training bits of the complementing training symbols are inserted in a Frame Body data unit, before passing it down to a medium access control (MAC) sub-layer, as a binary vector of length NMEN bits+NDBPS bits, where the first NMEM bits of the sequence are provided in order to terminate an encoder of the transmitter in a known state, and the rest of the NDBPS bits correspond to one OFDM training symbol, and the insertion is performed at specific positons taking into consideration an interleaver of the transmitter and other fields added.