| Multi-point collaborative communication has been paid more attention because of its advantages such as expanding transmission range and enhancing receiving power.However,due to the openness of the transmission channel,communication security problems will be faced in the multi-point collaborative communication,such as information easily being eavesdropped,attacked and destroyed.Among them,information eavesdropping is a more common security problem.Due to the different location distribution of collaboration nodes,the generated side lobe beam is often asymmetric and has a high radiated power,so the eavesdropper is easy to capture the signal,which makes the communication transmission process is faced with huge security risks.Therefore,this paper focuses on the problem of communication security caused by the high radiated sidelobes,and proposes a multi-point collaborative communication transmission scheme that makes the beam radiation in the direction of the eavesdropping area low,so as to reduce the possibility of the signal being captured by the non-expected receiver and enhance the security of legitimate link transmission.The main contributions of this paper are summarized as follows:(1)This work proposed a low radiation transmission scheme based on multi-point collaborative communication to reduce the possibility of signal capture by non-expected receivers.In view of the communication security problems caused by high radiated sidelobe power,in the case of one-dimensional circular line modeling and twodimensional fan-ring modeling,firstly,the interception area formula for two types of the eavesdropper area was derived and used as an evaluation index.Secondly,based on the minimization of intercepted area,a beam optimization algorithm was proposed in two kinds of intercepted area cases.The algorithm could obtain the emission weights of the collaborative nodes and realize the low radiation emission scheme.Finally,compared with other schemes,the beam pattern was analyzed and the role of key parameters was explored through simulation experiments to verify the effectiveness and advantage of the proposed scheme.(2)In order to further reduce the possibility of the signal being captured by the nonexpected receiver,a low radiation emission scheme based on multi-point collaborative communication was proposed by introducing the relay method.When two-dimensional eavesdropping area was modeled as a fan ring,based on minimizing intercepted area,intercepted area formula was derived.Then classified the relay location area based on the position of the eavesdropping area and the center distance of the circle.And then based on the classification results of the relay location region,the relationship between the interception area ratio of two transmission stages corresponding to different relays was used to determine the region where the best relay location may occur.Then traversed the area to determine the best relay location,and used of beam optimization to optimize the first phase transmission process to get the best relay location of optimization and the corresponding emission weight of the collaboration node.Finally,those could achieve the transmission scheme with low radiation.The effectiveness of the proposed scheme to achieve low interception of the system was verified by simulation experiments and the influence of different sizes of eavesdropping areas was analyzed.At the same time,the effects of different loss factors and interception threshold on the intercepted area under the comparison scheme were also explored to show the advantages of the proposed scheme.Through the above research,it can further realize the low interception of the system and enhance the communication security of the system.In this paper,a low radiation transmission scheme based on multi-point collaboration is studied.In order to solve the problem of communication security caused by high radiated sidelobe power,a low radiation emission scheme of multi-point collaborative communication without and with relays is proposed.Compared with other studies,the effectiveness and advantage of the proposed scheme is verified by analyzing the beam pattern and the key influencing factors of the system. |
