Self-adapting multi-band cooperative security transmission method and device
A secure transmission and multi-band technology, which is applied in the field of self-adaptive multi-band cooperative secure transmission methods and devices, can solve problems such as inability to obtain valid data, system crashes, and communication speed difficulties, so as to increase the difficulty of deciphering, broad application prospects, The effect of small channel bandwidth
Active Publication Date: 2017-05-31
SHANGHAI JIAO TONG UNIV
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Problems solved by technology
For third-party eavesdroppers, if the coefficient matrix is unknown, or the obtained sparse matrix is not of rank, valid data cannot be obtained
However, using broadband channels to realize frequency hopping / time hopping transmission to prevent interference, the algorithm implementation complexity is high, and it is difficult to increase the communication rate
Broadband communication without physical layer security enhancement has poor anti-interference ability, and it is very likely to cause system crash when it is disturbed by the outside world
Method used
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[0031] For a wireless communication system, send the information M transmitted by the node, perform network coding on all the original information M, and group the data N after network coding into coded data D according to the content 1 , coefficient matrix D 2 and the remaining unencoded data D 3 .
[0032] for D 1 For broadband transmission, for D 2 and D 3 , using the frequency hopping technology of 6 frequency points for transmission, and the frequencies of the frequency points are respectively recorded as f 1 , f 2 , f 3 , f 4 , f 5 and f 6 . Choose as different modulation methods as possible at different frequency points, specifically BPSK, QPSK, 8QAM, 16QAM, FSK and 8FSK. The receiving node will receive the information transmitted through the broadband D 1 ’ and the coefficient matrix D transmitted by narrowband frequency hopping 2 ’ and the unencoded packet D 3 ’, and then decode and restore the original data.
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The invention relates to a self-adapting multi-band cooperative security transmission method and a self-adapting multi-band cooperative security transmission device. The method comprises the following steps: 1, a sending node performs network coding on original data, and groups the data, wherein the original data is divided into a coded data subgroup, a coefficient matrix and an uncoded subgroup; 2, multi-band cooperative security transmission is performed, the information of the coded data subgroup is transmitted via broadband, and the coefficient matrix and an original code subgroup are transmitted via narrowband, wherein the original code subgroup is the uncoded subgroup; and 3, a receiving node decodes the received coded data subgroup, the coefficient matrix and the uncoded subgroup to recover the original data. Compared with the prior art, the method and the device provided by the invention transmit data information via the broadband, and transmits control information and command information via the narrowband, so that the situation that the system can still work normally when the broadband communication is disturbed is ensured, and the method and the device have wider application prospects in the actual application of wireless communication.
Description
technical field [0001] The present invention relates to the technical field of wireless communication, in particular to an adaptive multi-band coordinated secure transmission method and device. Background technique [0002] Network coding technology, as an important breakthrough in the field of network communication, has rapidly developed into an important research field. Network coding is an information exchange technology that combines coding and routing. Its principle is that nodes in the network code and fuse multiple received data packets, and the coded data is forwarded by intermediate nodes in a multicast manner. The destination node can decode according to the corresponding coding coefficients, so as to restore the original data. Network coding achieves the upper bound of the network maximum flow transmission theory by allowing network intermediate nodes to encode different data stream data, and also changes the role of nodes in traditional networks only as data sto...
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IPC IPC(8): H04L29/06
CPCH04L63/18
Inventor 钱良杨峰丁良辉
Owner SHANGHAI JIAO TONG UNIV