Reciprocal random source extraction method and device for time division duplex system

Abstract

The invention belongs to the technical field of wireless communication, and in particular relates to a method and device for extracting a reciprocal random source for a time division duplex system. ; Extract the differential information on different probing time slots of the channel characteristic parameter sequence of the uplink and downlink subframes to eliminate the difference between the uplink and downlink probing; obtain the reciprocal channel characteristics according to the differential information of the uplink and downlink subframes on the adjacent probing time slots. The present invention uses the transceivers of both legal parties to estimate channel characteristics in adjacent uplink and downlink subframes, respectively performs differential operations on the channel characteristic sequences detected by itself in time, and eliminates the differences between the legal two parties due to power control, transceiver radio frequency channels The reciprocity of the detection parameters is lost due to factors such as the loss of the reciprocity of the detection parameters, the shared random source with strong reciprocity is obtained, and it is easy to combine with the existing TDD communication system, without major changes to the existing communication architecture, and has strong application prospects. .

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and particularly relates to a method and device for extracting a reciprocal random source for a time division duplex system. Background technique [0002] The openness of electromagnetic wave propagation makes wireless communication security threats always exist. In traditional security methods, the security of wireless communication is ensured by upper-layer protocols and cryptographic methods. However, in recent years, new protocol loopholes have been discovered. With the development of high-performance computing technology, cryptographic security has also been severely impacted. On the other hand, with the continuous evolution of wireless communication technology, especially mobile communication technology, the communication rate requirements are rapidly increasing, which also brings enormous pressure to communication security. The physical layer security technology uses the ch...

AI Technical Summary

Problems solved by technology

One of the keys to the realization of physical layer security technology lies in the extraction of reciprocal random sources by legitimate communication parties. However, in existing wireless communication systems, due to factors such as power control and differences in radio frequency channels of transceivers, it is often difficult to directly Extracting random information such as reciprocal signal strength and phase greatly increases the difficulty of engineering implementation of physical layer security technology

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