High spectrum efficiency security access method based on dual non-orthogonal characteristics

Abstract

The invention provides a high spectrum efficiency security access method based on dual non-orthogonal characteristics, which supports secure accesses of more users under the same quantity of carriers,and belongs to the technical field of information and communication. The method is applied to an uplink, and comprises the steps as follows: S1, the J users share N non-orthogonal sub-carriers, and Jis more than N; input signals of the J users are separately subjected to non-orthogonally secure mapping according to a security matrix, and thus multiple accesses are achieved; S2, the J signals after non-orthogonally secure mapping are separately subjected to non-orthogonal multiplexing, and a bandwidth compression factor can be changed in the non-orthogonal multiplexing; S3, the J signals after non-orthogonally secure mapping are overlapped into one signal to be transmitted in a channel; S4, a receiver performs non-orthogonal demultiplexing on the received signal; and S5, the non-orthogonally demultiplexed signal is subjected to non-orthogonally secure demapping according to the security matrix, and thus the estimated values of the input signals of the J users are acquired. According to the method provided by the invention, the performance of secure wireless communication and the bandwidth utilization ratio also can be improved, and meanwhile, the same transmission speed of the every carrier is kept.

Description

technical field [0001] The present invention relates to the technical field of information and communication, in particular to a high spectral efficiency security access method based on dual non-orthogonal characteristics of a wireless communication access system. Background technique [0002] As an important part of future wireless communication systems, the Internet of Things (IoT) provides ubiquitous connectivity and information exchange to enable a range of services and applications such as smart cities, global satellite communications, and security emergency systems. However, due to massive data access and heterogeneous network environment, IoT has caused huge pressure on spectrum resources, bandwidth efficiency and security issues. Therefore, these aspects of IoT have attracted a lot of attention recently. [0003] Orthogonal Multiple Access (OMA) schemes such as Orthogonal Frequency Division Multiple Access (OFDMA), Code Division Multiple Access (CDMA), Time Division...

AI Technical Summary

Problems solved by technology

Both SEFDM and FTN are transmission schemes that achieve high spectral efficiency by reducing the interval between subcarriers, but these are still difficult to meet the needs of massive Internet of Things access in the future

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