We propose a new secure transmission scheme for uplink multiple-input single-output (MISO) orthogonal-frequency multiplexing (OFDM) systems in the presence of multiple eavesdroppers. Our proposed scheme utilizes the sub-channels orthogonality of OFDM systems to simultaneously transmit data and secret key symbols. The base station, Bob, shares secret key symbols with the legitimate user, Alice, using wiretap coding over a portion of the sub-channels. Concurrently, Alice uses the accumulated secret keys in her secret-key queue to encrypt data symbols using a one time pad (OTP) cipher and transmits them to Bob over the remaining sub-channels. if Alice did not accumulate sufficient keys in her secret-key queue, she employs wiretap coding to secure her data transmissions. We propose fixed and dynamic sub-channel allocation schemes to divide the sub-channels between data and secret keys. We derive the secrecy outage probability (SOP) and the secure throughput for the proposed scheme. We quantify the system's security under practical non-Gaussian transmissions where discrete signal constellation points are transmitted by the legitimate source nodes. Numerical results validate our theoretical findings and quantify the impact of different system design parameters.
翻译:我们提出一个新的安全传输计划,在多个窃听器在场的情况下,将多投入单输出(MISO)或超频多发(OFDM)系统连接起来。我们提议的计划利用OFDD系统子通道的交替性同步同步传输数据和秘密关键符号。基地站鲍勃与合法用户Alice共享秘密关键符号,使用窃听码将数据与部分子通道连接起来。与此同时,爱丽丝使用她秘密密钥队列中累积的秘密密钥使用一个时垫(OTP)密码将数据符号传输给鲍勃,并将其传送给剩余子通道的鲍勃。如果爱丽丝没有在她的密钥队列中积累足够的密钥,她就会使用电磁盘编码,确保数据传输。我们提出了固定和动态的子通道分配计划,将数据与秘密密钥隔开。我们用一个时垫(SOP)累积的秘密密键来加密数据符号符号,用一个时垫(OTP)加密密码将数据符号传送到其余的子通道上。我们量化了系统的安全,而实际上的离质的理论验证系统将无法验证。