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| 1 | Robust secure transmission for multiuser MISO systems with probabilistic QoS constraints显示文摘This paper considers a unicast multiuser multiple-input single-output(MISO) downlink system overheard by multiple single-antenna eavesdroppers. The objective is to jointly design the beamforming vectors and the artificial noise(AN) covariance matrix with imperfect channel state information(CSI) at the transmitter,such that the total transmit power is minimized while satisfying probabilistic quality of service(Qo S) constraints at legitimate users and the eavesdroppers. Using Bernstein-type inequalities and the S-procedure, we recast the non-convex power minimization problem as two different convex semidefinite programs(SDPs) which can be solved using interior-point methods. Simulation results show that the proposed methods outperform a nonrobust method and the ones using the isotropic AN. | Lijian ZHANG Liang JIN Wenyu LUO Chunming WANG Yanqun TANG | 2016 | Science China(Information Sciences)2016，59，2： | 7 |
| 2 | CodeHop: physical layer error correction and encryption with LDPC-based code hopping显示文摘This paper proposes a novel scheme named Code Hop, which provides both information reliability and security using code hopping based on low-density parity-check(LDPC) codes. In contrast to traditional systems that perform error correction and encryption at different layers, Code Hop combines these two operations into a single step at physical layer, such that each plaintext message is jointly encoded and encrypted by a hopping parity-check matrix. According to a pseudo-random number generator(PRNG), the hopping matrix may rapidly switch among a sequence of LDPC parity-check matrices, which is randomly generated by a structured-random protograph expanding technique. Simulations show that reliable communication can be achieved by Code Hop with good error-correcting performance. In the meantime, Code Hop may improve the security of traditional systems such as GSM. Taking the A5/1 stream cipher used in GSM as the PRNG, it is shown that Code Hop is resistant to existing chosen-plaintext attacks that break A5/1 cipher already. Moreover, the security of Code Hop will be enhanced in the presence of channel errors as well. | Zhao CHEN Liuguo YIN Yukui PEI Jianhua LU | 2016 | Science China(Information Sciences)2016，59，10： | 3 |
| 3 | A random linear code based secure transmission scheme for wireless fading channels显示文摘Dear editor,Wireless transmissions are vulnerable to potential security threats such as eavesdropping and wiretapping since unauthorized reception is facilitated through wireless channels[1].Traditional system security is mainly implemented in the higher layers of the communication protocol stack,relying on authentication and cryptography[2].The recent researches explore security in the physical layer[3],which can help to protect the | Lukman A.OLAWOYIN Nana ZHANG A.O.OLOYEDE Nasir FARUK Hongwen YANG | 2017 | Science China(Information Sciences)2017，60，4： | 1 |
| 4 | Synthesis-free directional modulation for retrodirective frequency diverse array显示文摘Combination of directional modulation(DM)and frequency diverse array(FDA)provides a novel opportunity for enabling physical layer security because of the enhanced ability of distance resolution.However,in the existing studies,the time-varying nature of the FDA pattern is usually ignored.In this paper,a modified model of FDA-DM is proposed,in which the ignored time factor in the previous studies is taken into consideration for providing a new and more accurate perspective on evaluating the security of FDA-DM.Furthermore,we reveal that FDA-DM can achieve angle-dependent and directional-time-coupleddependent security.After that,based on the retrodirective FDA(RFDA)with a new structure,a novel synthesis-free FDA-DM scheme is proposed for both overcoming the limitations of the FDA-DM scheme and allowing self-tracking the position of the pilot signal without any prior knowledge.Meanwhile,a new set of nonlinear frequency offsets,defined as rearranged linear frequency offsets(RLFOs),is also proposed for both combining the advantages of the linear/nonlinear frequency offsets and bringing conveniences to practical implementation.In addition,the closed-form expression of the average signal-to-artificial-noise-ratio(SANR)is given out for evaluating the security performance of the proposed scheme.Finally,numerical results are presented to verify both the accuracy of the proposed theoretical analysis and the superiority of the RFDADM scheme. | Sheng KE Jianping AN Shuai WANG | 2020 | Science China(Information Sciences)2020，63，10： | 0 |
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