High-spectral-efficiency secure-truncation orthogonal frequency division multiplexing transmission method

Abstract

The invention provides a high-spectral-efficiency secure-truncation orthogonal frequency division multiplexing transmission method and relates to the technical field of information and communication.The method comprises the steps of inputting a bit information sending sequence I into a transmitter based on IFFT, outputting a time domain sending signal s, and carrying out random truncation on thetime domain sending signal through utilization of a security matrix theta, and sending the signal; and receiving a signal vector y by a receiver based on FFT under the condition that the theta is known, obtaining a frequency domain observation signal vector Y, carrying out V times of ICI interference suppression on the Y, finishing iteration, obtaining a received signal vector Y^caret, and outputting an estimated value S^caret through hard decision based on the Y^caret, passing a demodulator by the S^caret and then outputting the estimated value I^caret of the bit sending sequence, wherein one-time ICI interference suppression comprises the process of adding the frequency domain observation signal vector Y and currently obtained interference estimation -CS<v>-tilde to obtain the received signal vector Y^caret, obtaining the estimated value S<v>-tilde of the bit information sending sequence through the hard decision based on the obtained received signal vector Y^caret, and carrying outICI estimation on the estimated value S<v>-tilde to obtain the interference estimation -CS<v>-tilde. According to the method, the error performance of the receiver of a legal user is improved.

Description

technical field [0001] The invention relates to the technical field of information and communication, in particular to a transmission method for high spectral efficiency and safe truncated orthogonal frequency division multiplexing. Background technique [0002] The Internet of Things era relies on the interconnection of a large number of smart devices to provide many emerging services, and the information processing and perception involved in it generate massive data information. In the face of the current scarcity of spectrum resources, high spectrum utilization is required for massive data communication and information exchange between devices in the Internet of Things. In addition, when diversified services are integrated into the same network, communication between smart devices Confidentiality is even more worthy of attention. [0003] To address the above spectral efficiency improvement issues, some physical layer non-orthogonal transmission schemes have been propose...

AI Technical Summary

Problems solved by technology

However, inter-subcarrier interference is inevitably introduced when non-orthogonal subcarriers are deployed, which leads to serious deterioration of system error performance and increases the complexity of signal demodulation

In summary, the waveform design for spectrum efficiency and secure transmission is carried out independently in the current research, considering the high transmission rate and high security required for massive data transmission generated by diverse services in IoT applications, Therefore, waveform design for improving spectral efficiency and safe transmission needs to be proposed

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