Method of processing a data packet before transmission over a radio communications network, a method of processing a received data packet, and associated devices and systems

A method comprising:

• processing a data packet received by a receiver node in a radio communications network, said data packet being transmitted by a transmitter node to a destination node as a succession of waveforms transmitted at positions defined by hopping codes, said positions possibly being time positions or frequency positions, wherein processing comprises the following steps performed for each waveform received by a receiver node:
• predicting by the receiver node a first position for receiving a 0 value bit and a second position for receiving a 1 value bit by calculating first and second hopping codes at least as a function of an encryption key generated from a pseudo-random generator and shared with the transmitter node;
• detecting by the receiver node first and second quantities of energy received at the first and second predicted positions;
• and
• deciding by the receiver node on a value of the bit corresponding to the received waveform by comparing the energies detected at the first and second predictive positions.

A treatment device for treating a data packet before transmission over a radio communications network in the form of a succession of waveforms transmitted at positions defined by time hopping codes, said positions possibly being time positions or frequency positions, the packet being transmitted over a communications channel of the network by a transmitter node to a destination node, the device comprising the following means suitable for use on each bit of a data word of the data packet to be transmitted, referred to as the “current” bit:

• means for generating an encryption key shared between the transmitter node and the destination node;
• means for calculating a hopping code at least as a function of the current bit and of the encryption key;
• and
• means for causing a waveform to be transmitted at a position defined by the calculated hopping code, the transmitted waveform being identical regardless of a value of the bit to be transmitted.

A treatment device for treating a data packet received by a node of a radio communications network, said data packet being transmitted by a transmitter node to a destination node in the form of a succession of waveforms at positions defined by hopping codes, the device comprising, for a waveform received at a given position, the following means, performed for each received waveform:

• means for predicting a first position for receiving a 0 value bit and a second position for receiving a 1 value bit by calculating first and second hopping codes at least as a function of an encryption key generated from a pseudo-random generator and shared with the transmitter node;
• means for detecting first and second quantities of energy received at the first and second predicted positions;
• and
• means for deciding on a value of the bit corresponding to the received waveform by comparing the energies detected at the first and second predictive positions.

An apparatus comprising:

• an equipment node of a radio communications network suitable for transmitting and receiving data packets in the form of a succession of waveforms transmitted at positions defined by hopping codes, the equipment node comprising:
• a first device for processing a data packet before transmission, said positions being time positions or frequency positions, the first device comprising the following means suitable for use on each bit of a data word of the data packet to be transmitted, referred to as the “current” bit:
• means for generating an encryption key shared between the equipment node and a destination node of the network;
• means for calculating a hopping code at least as a function of the current bit and of the encryption key;
• and
• means for causing a waveform to be transmitted at a position defined by the calculated hopping code, the transmitted waveform being identical regardless of a value of the bit to be transmitted;
• and
• a second device for processing a received data packet, the second device comprising, for a waveform received at a given position, the following means, performed for each received waveform:
• means for predicting a first position for receiving a 0 value bit and a second position for receiving a 1 value bit by calculating first and second hopping codes at least as a function of an encryption key generated from a pseudo-random generator and shared with a transmitter node that transmitted the received waveform;
• means for detecting first and second quantities of energy received at the first and second predicted positions;
• and
• means for deciding on a value of the bit corresponding to the received waveform by comparing the energies detected at the first and second predictive positions.

A memory device comprising a computer program stored thereon and including instructions for performing a method for processing a received data packet received by a receiver node in a radio communications network, when the program is executed by a processor, said data packet being transmitted by a transmitter node to a destination node as a succession of waveforms transmitted at positions defined by hopping codes, said positions possibly being time positions or frequency positions, wherein the method includes the following steps performed by the processor for each waveform received by the receiver node:

• predicting by the receiver node a first position for receiving a 0 value bit and a second position for receiving a 1 value bit by calculating first and second hopping codes at least as a function of an encryption key generated from a pseudo-random generator and shared with the transmitter node;
• detecting by the receiver node first and second quantities of energy received at the first and second predicted positions;
• and
• deciding by the receiver node on a value of the bit corresponding to the received waveform by comparing the energies detected at the first and second predictive positions.