Direction modulation method based on self-sustaining jammer

Abstract

The invention provides a direction modulation method based on a self-sustaining jammer, and the method comprises the steps: respectively building beam forming vector models at a source, a relay and the jammer according to the maximum transmitting power and the maximum transmission ratio of the relay; replacing the original constraint condition with the condition that the maximum reachable rate from the source to the relay is greater than the maximum reachable rate from the relay to the destination node to obtain a beam forming vector of the source node; simplifying the beamforming vector optimization models of the jammer and the relay into a standard Rayleigh Ritz quotient model, and solving beamforming vectors at the relay and the jammer; utilizing the maximization of the ratio of the confidential information power received by the destination to the confidential information power leaked to the eavesdropper to construct a low-delay cooperation-free relay beam forming model, and solvinga cooperation-free relay beam forming vector; and integrating the beamforming vectors of the source node, the jammer, the relay and the non-cooperative relay to carry out partial cooperative or non-cooperative direction modulation. Compared with the original scheme, the beamforming vector is more stable relative to the angle estimation error.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a directional modulation method based on a self-sustaining jammer. Background technique [0002] Due to the broadcast nature of wireless media, confidential information exchanged over wireless networks can easily be overheard or decoded by unintentional recipients, which poses a serious security risk to wireless networks. Therefore, privacy and security issues have become major concerns for wireless communication applications. Directional modulation (DM) introduces artificial noise through the transmitter, transmits coherent information to a specific desired direction, and at the same time interferes with constellations in other undesired directions, making it impossible for bugs to recover useful signals. It is considered to be an effective way to improve communication security. method. However, because the transmitter needs to transmit both artificial noise and...

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Problems solved by technology

However, because the transmitter needs to transmit artificial noise and useful signals at the same time, the energy efficiency of traditional directional modulation is low

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