Research On Multidimensional Information Transmission Method Based On DSSS

In the field of modern communication,spread spectrum communication system,as a communication method with better concealment,reliability and anti-jamming performance,has received a lot of attention in the field of communication.When the information to be transmitted is large and the spread spectrum pseudo code sequence rate is low,the information transmission security is low and the transmission error rate is high.In order to improve the transmission rate of information and enhance the confidentiality of the system,starting from the traditional direct sequence spread spectrum system,combined with the principle of M-ary spread spectrum,two-dimensional information constellation rotation mapping transmission method and three-dimensional information mapping transmission method based on the traditional direct sequence spread spectrum system are proposed.In the two-dimensional information constellation rotation mapping transmission method,the information to be transmitted is regarded as one-dimensional information,on which the second two-dimensional information to be transmitted is added.The mapping information is obtained by using the two-dimensional information through the constellation rotation mapping relationship model,and then the spread spectrum pseudo code sequence is selected,and the pseudo code and one-dimensional information spread spectrum are used to realize the simultaneous transmission of one-dimensional information and two-dimensional information.At the receiver,the rotation reflection reflection relation model of constellation is established.The two-dimensional information is analyzed by using the channel number of spread spectrum PN code obtained after correlation.The spread spectrum PN code and demodulation signal are despread to realize the one-dimensional information reception.In the three-dimensional information mapping transmission method,the third-dimensional information to be transmitted is added,and the three-dimensional information mapping relationship model is established at the transmitter.Based on the two-dimensional information constellation rotation mapping transmission method,the spread spectrum pseudo code sequence is selected,and the three-dimensional information mapping relationship model is used to map the pseudo code.According to the three-dimensional information mapping PN code part of the code,the spread spectrum PN code mapping is realized,so that the PN code sequence carries two-dimensional information and three-dimensional information.A three-dimensional information reflection relation model is established at the receiver.The three-dimensional information is analyzed according to the PAPR of the receiver.The pseudo code is mapped by the three-dimensional information,and the spread spectrum pseudo code is despread with the demodulation signal to obtain one-dimensional information.One dimensional information,two-dimensional information and three-dimensional information are transmitted at the same time,and higher information transmission rate and higher concealment performance are obtained.The transmitter and receiver of two-dimensional information constellation rotation mapping transmission method and three-dimensional information mapping transmission method are simulated and tested,and the simulation is focused on the related channel and error performance of the receiver.The results show that the two-dimensional information constellation rotation mapping transmission method and three-dimensional information mapping transmission method have better BER performance than the traditional direct sequence spread spectrum method,and have higher information transmission rate and security performance.