Patent ID: RE43128

Claim:
A process for transmitting data in packets, the packets comprising a header at a first carrier frequency, followed by an information field at a second carrier frequency, a start of transmission of the information field being tied to a start of transmission of the header of the corresponding packet, comprising: obtaining data packets to be transmitted the packets comprising a header to be transmitted at a first carrier frequency, followed by an information field to be transmitted at a second carrier frequency, wherein a start of transmission of the information field is tied to a start of transmission of the header of the corresponding packet, and wherein transmission at the second carrier frequency starts with the information field; using providing N distinct and simultaneous subcarriers for concurrent transmission of data in the information field, where N is an integer greater than 1; splitting the data to be transmitted in the information field into successive groups of N M symbols; assigning the N symbols M symbols respectively to the N subcarriers by OFDM multiplexing; modulating the N subcarriers respectively by the N symbols M symbols thereby obtaining a modulating signal made of the N subcarriers; generating a transmit signal at the second carrier frequency varying over time according to a linear ramp for optimizing bandwidth use; modulating the transmit signal at the second carrier frequency by the modulating signal; and mixing the transmit signal, upon reception, corresponding to the information field with a ramp signal corresponding to the transmit signal at the second carrier frequency to obtain a received signal corresponding to the modulating signal and to extract from the received signal data of the information field.