A point-to-point key agreement method based on physical layer pilot pre-tuning

Abstract

The invention discloses a point-to-point key negotiation method based on physical layer pilot pre-adjustment, comprising: a mobile station transmits a standard pilot signal to a base station, and the base station estimates and quantizes the complex channel coefficient of the uplink through the standard pilot signal to obtain the obtained The required base station key; the base station calculates the pilot pre-modulation coefficient, so that the equivalent complex channel coefficient multiplied by the pilot pre-modulation coefficient and the uplink complex channel coefficient is in the center of the complex channel coefficient quantization decision domain ; The base station transmits the pilot obtained by multiplying the pilot pre-modulation coefficient by the standard pilot, and the mobile station estimates and quantizes the equivalent complex channel coefficient of the downlink through the standard pilot signal to obtain the required mobile terminal key. The invention completes the whole process of key generation, negotiation and distribution in one time according to the pilot frequency pre-adjustment of the physical layer, and has the advantages of high consistency rate of generated keys, good anti-eavesdropping performance, low implementation difficulty and low cost.

Description

technical field [0001] The invention relates to the secure communication field of a wireless communication system, in particular to realizing key generation, negotiation and distribution of communication parties through physical layer pilot frequency preadjustment. Background technique [0002] With the rapid development of modern communication technology, wireless communication has gradually become the mainstream of people's daily and even military communication methods because of its convenience. Wireless communication uses antennas to use electromagnetic waves as carriers to meet people's communication requirements. However, due to the openness of wireless electromagnetic wave transmission, anyone can intercept communication information at a location where the space electromagnetic signal is strong enough. Therefore, compared with wired, the security of wireless is more difficult to guarantee, and how to ensure that legitimate users can reliably receive confidential infor...

AI Technical Summary

Problems solved by technology

However, most of the key agreement schemes proposed by these researches, such as group shift quantization (GSQ), need to be completed at a high level, and the information exchanged through the public channel is more, the cost is high, the implementation is more complicated, and the physical layer transmission is not fully utilized. specialty

Very few negotiation schemes are similar to channel quantization with guard bands (CQG), although it can improve KAR, and the negotiation process is simple, just eliminate the channel characteristics at the quantization boundary, but this type of method will obviously reduce the length of the generated key

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