Complementary Code Scrambling Communication System Design And Performance Analysis

With the continuous development of mobile communication,rich applications and huge demand have created the intense pursuit of high capacity and high reliability.The outstanding features of multi-antenna technology just meet this demand,and with the continuous expansion of the antenna scale,the ability to access more users by space resources is expected.With this vision,this thesis studies scrambling complementary codes to realize multiple access in multi-antenna systems.The research content and main innovations involved are summarized as follows:Aiming at solving the problem that multi-user MIMO is highly dependent on channel state information,firstly,this thesis proposes a multi-access scheme based on space-time-frequency three-dimensional scrambling complementary code,and designs a new three-dimensional scrambling complementary code combined with multi-antenna technology to access users.The scheme can achieve that different users share the same frequency-time resource,and can maintain orthogonality in the three-dimensional scrambling complementary codes domain without channel state information feedback.The three-dimensional scrambling complementary code can jointly utilize the space-time-frequency three-dimensional resources,improve the spectrum utilization rate,and resist the multipath interference and multiple access interference under the large bandwidth.In addition,the study reveals that the number of users increases linearly with the number of transmit antennas,which exactly adapts massive MIMO technology.After analysis and demonstration,compared with,the proposed scheme outperforms the traditional multiple access scheme in terms of robustness.Secondly,considering that the anti-multipath interference ability of space-time-frequency three-dimensional scrambling complementary code is limited by the code length,a multi-antenna orthogonal frequency division multiplexing scheme based on space-frequency two-dimensional scrambling complementary code is proposed.A multi-antenna orthogonal frequency division multiplexing system is designed in combination with the scrambling complementary code to resist multipath interference.Compared with the traditional multi-antenna orthogonal frequency division multiplexing system,the proposed scheme ensures the number of access users while effectively improving the bit error performance and reliability of the system.The schemeand also lends itself nicely to massive MIMO systems.Thirdly,this thesis studies the communication technology based on the phased array antenna,proposes the phased array communication scheme under the multi-frequency system by designing the time-frequency two-dimensional scrambling complementary code,and utilizes the high reliability and flexible beam alignment characteristics of the phased array antenna to achieve efficient multi-user communication.In summary,based on the scrambling complementary code technology,this thesis proposes a corresponding multiple access scheme and an application scheme in a multi-antenna system.The performance of the proposed scheme is verified by simulation,which provides a basis for future research on large-scale access systems.