Research And Application Of Blind Recovery Of Pseudo-random Sequence

As one of the key technologies of modern communication,MIMO technology can increase the wireless range and greatly improve the spectrum utilization.However,with the increasing demand of users,how to simplify receiving equipment in MIMO wireless communication,improve the anti-interference ability of data transmission,and protect the confidentiality of user transmission data has become an important research topic.In order to realize the new spread spectrum system,the pseudo-random sequence is first studied.Then this paper studies the algebraic and statistical methods for blind recovery of m-sequences in scrambling codes,and obtains that the premise of the blind despreading algorithm is that the data is unbalanced.Secondly,based on the Walsh-hadamard algorithm and the cluzeau algorithm used in the blind recovery of m-sequence in the scrambling code,two blind despreading methods are proposed to realize the blind despreading process.By studying the performance of these two algorithms,according to the computational complexity of the two algorithms,the two algorithms are respectively applied to the recovery of low-order and high-order feedback polynomials to optimize blind despreading.Then on the basis of direct sequence spread spectrum,an improved spread spectrum method in MIMO wireless communication system is proposed,and its anti-eavesdropping principle is demonstrated through system model construction.It is verified by simulation that this spread spectrum method can achieve low bit error rate transmission of data when the SNR is 20 d B less than that of direct sequence spread spectrum.According to the image display,the cluzeau algorithm and walsh-hadamard algorithm can realize the blind recovery of the feedback polynomial under low SNR.The experimental results also show that the use of new spread spectrum methods and despread methods can not only improve the antiinterference ability and security of the transmitted signal,but also simplify the receiving equipment to a great extent.Figure 31;Table 4;Reference 45...