A key generation method based on wireless channel characteristics in a frequency division duplex system

Abstract

This application proposes a key generation method based on wireless channel characteristics in a frequency division duplex system, including: the communication parties perform channel estimation to obtain the channel state information of the uplink at the same time; respectively obtain the channel state information from the estimated channel state information Extract and quantify a characteristic parameter; perform consensus negotiation according to the quantized value; and obtain a consistent key after mapping according to the quantized value according to the negotiation result. The key obtained by the method of the present invention has randomness, privacy and can be updated in real time, which greatly enhances the security of the key, and can be well applied even in a high-speed mobile environment; at the same time, the method and the existing Some wireless communication systems have good compatibility and have good market application value.

Description

technical field

[0001] The present application relates to the field of information encryption, and in particular to a key generation method under a Frequency Division Duplex (FDD, Frequency Division Duplex) system. Background technique

[0002] With the rapid development of computer and communication technology, wireless communication network has become a research hotspot and the most rapid growth point in the field of communication, accompanied by the security problems it faces, which must be solved.

[0003] As we all know, the channel of wireless communication is open, and users can roam, which causes the security threat of wireless communication system to be far greater than that of wired communication system. Any intruder can easily intercept the wireless transmission signal without being detected. If the transmitted signal is not well protected, it will easily cause information leakage.

[0004] The security mechanism of the current wireless communication system is ba...

Examples

Embodiment Construction

[0030] The main idea of ​​this application is that, in the FDD system, the communication parties firstly obtain the uplink channel state information confidentially by sending random sounding signals and forwarding the other party’s random sounding signals and their conjugates, and then the acquired channel state information Perform feature extraction and quantization, and then send instruction information based on the quantization results to achieve consensus negotiation. After consensus negotiation, both parties map the quantized values ​​respectively to obtain the consensus key.

[0031] The principle of the present application is to extract random and private feature information from channel information with space fast decorrelation characteristics to generate a key. Specifically, the communication parties estimate the state information of the uplink at the same time, and use the strong correlation between the channel state information estimates of the same channel at the sa...

technical field

[0001] The present application relates to the field of information encryption, and in particular to a key generation method under a Frequency Division Duplex (FDD, Frequency Division Duplex) system. Background technique

[0002] With the rapid development of computer and communication technology, wireless communication network has become a research hotspot and the most rapid growth point in the field of communication, accompanied by the security problems it faces, which must be solved.

[0003] As we all know, the channel of wireless communication is open, and users can roam, which causes the security threat of wireless communication system to be far greater than that of wired communication system. Any intruder can easily intercept the wireless transmission signal without being detected. If the transmitted signal is not well protected, it will easily cause information leakage.

[0004] The security mechanism of the current wireless communication system is ba...

Examples

Embodiment Construction

[0030] The main idea of ​​this application is that, in the FDD system, the communication parties firstly obtain the uplink channel state information confidentially by sending random sounding signals and forwarding the other party’s random sounding signals and their conjugates, and then the acquired channel state information Perform feature extraction and quantization, and then send instruction information based on the quantization results to achieve consensus negotiation. After consensus negotiation, both parties map the quantized values ​​respectively to obtain the consensus key.

[0031] The principle of the present application is to extract random and private feature information from channel information with space fast decorrelation characteristics to generate a key. Specifically, the communication parties estimate the state information of the uplink at the same time, and use the strong correlation between the channel state information estimates of the same channel at the sa...

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