An Asymmetric Privacy Preserving Method Based on Constellation Overlap and Noise Aggregation

Abstract

The invention discloses an asymmetric privacy protection method based on constellation overlapping and noise aggregation. The method comprises the following steps that 1), a user A carries out estimation to obtain a channel coefficient h<AR><(H)> from a relay R to the user A and the channel coefficient h<(H)> from the relay R to a user B, and the user B carries out the estimation to obtain thechannel coefficient h<AR><(H)> from the relay R to the user A and the channel coefficient h<(H)>from the relay R to the user B; 2), the user A and the user B sends signals x<(H)> and x<(H)>to the relay R at the same time, the relay R amplifies the received signals and broadcasts the amplified signals to the user A and the user B; 3), decision s<A,B><(H)>-caret of s<(H)> is obtained,and the decision s<B,A><(H)>-caret of s<(H)> is obtained; 4), in a first time slot of a second information transmission phase, the user A and the user B sends the signals x<(L)> and x<(L)> to the relay R at the same time; and 5), the decision of s<(L)> and the decision of the s<(L)> are obtained, thereby finishing the asymmetric privacy protection based on the constellation overlapping and noise aggregation. According to the method, differentiated demands of high priority information and low priority information of the users for the security and reliability can be satisfied atthe same time.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to an asymmetric privacy protection method based on constellation overlapping and noise aggregation. Background technique [0002] In order to ensure that users at the edge of the cell or covered by buildings can exchange information with the base station reliably, the cellular communication system often needs to set up a relay between the base station and the user to assist in completing the communication process. The system composed of base stations, users and relays can be abstracted as a two-way relay system. Most of the previous researches on two-way relay systems only focus on techniques to enhance communication reliability, such as user scheduling, relay selection, beam optimization, and power control, and rarely involve security issues in two-way relay systems. In fact, the security risks caused by untrustworthy relay nodes cannot be ignored. For example, in t...

AI Technical Summary

Problems solved by technology

However, these technical solutions do not take into account the priority difference of user information, and consider that all information has the same priority. In fact, in many application scenarios, the information transmitted in the network has significant priority differences.

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