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A multi-user mimo symmetric channel feature acquisition method based on conjugate precoding

A symmetric channel and acquisition method technology, applied in the field of symmetric channel feature acquisition, can solve the problem of not utilizing the focusing effect of multi-antenna array, and achieve the effect of avoiding pilot pollution attack, improving randomness and update rate

Active Publication Date: 2022-04-01
SOUTHEAST UNIV +1
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  • Claims
  • Application Information

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Problems solved by technology

This method mainly uses the spatial diversity of multi-antennas to improve the randomness and update rate of keys, and does not take advantage of the focusing effect of multi-antenna arrays.

Method used

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  • A multi-user mimo symmetric channel feature acquisition method based on conjugate precoding
  • A multi-user mimo symmetric channel feature acquisition method based on conjugate precoding
  • A multi-user mimo symmetric channel feature acquisition method based on conjugate precoding

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Embodiment Construction

[0036] Such as figure 2 , which shows the base station equipment B and the user terminal equipment U of the present invention k and a general model for potential attackers. The present invention requires the base station device B to have multiple antennas. In order not to lose the versatility, the base station equipment B contains the B 1,B 2 …B M A total of M antennas, user terminal equipment U k Contains N k root antenna.

[0037] In this specific embodiment, the communication parties adopt OFDM (orthogonal frequency division multiplexing technology) to modulate the transmission signal, and each OFDM symbol has a total of K f A subcarrier that can modulate information. Before the data is transmitted, both communication parties conduct wireless channel detection on both sides to obtain symmetrical wireless channel characteristics. The channel feature can generate a symmetric key for both communication parties. The process of wireless channel detection is divided in...

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Abstract

The invention discloses a multi-user MIMO symmetric channel feature acquisition method based on conjugate precoding. A user terminal selects an antenna to send a piece of private information with high randomness to a base station device, and the base station device conjugates the received signal. Pre-encoded, then superimposed on its own private information, and sent to the user terminal. Through the method of the invention, the communication parties can obtain symmetric wireless channel characteristics that integrate private information of both parties, thereby generating a symmetric key with high randomness. Using private information as a channel sounding signal can avoid pilot attacks, and at the same time improve the randomness and update rate of the generated key; through conjugate precoding, the base station equipment can obtain the focusing effect of the multi-antenna array without estimating the channel state information. The user terminal can check whether the entire signal interaction process is attacked or interfered with. The invention can improve the security and reliability of the technology of generating a key by wireless channel characteristics.

Description

technical field [0001] The present invention relates to a method for acquiring symmetric channel features, in particular to a method for acquiring multi-user MIMO symmetric channel features based on conjugate precoding. Background technique [0002] Multi-user MIMO is one of the core technologies of 5G. By using a large number of antennas in the base station to achieve a substantial increase in channel capacity, multiple users can be served simultaneously on the same frequency band. Correspondingly, based on the focusing effect of the antenna array, the user terminal equipment only needs to be equipped with a small number of antennas, which reduces the cost and power consumption of the user terminal. [0003] Due to the openness of wireless channels, wireless communication systems are vulnerable to eavesdropping and attacks. Key generation based on wireless channel characteristics is a physical layer security technology. Due to the short-term reciprocity of the wireless ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0452H04B7/0456H04B7/06H04B7/08H04B7/0404
CPCH04B7/0452H04B7/0456H04B7/0608H04B7/0805H04B7/0404
Inventor 付华彭林宁胡爱群
Owner SOUTHEAST UNIV