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Physical layer security algorithm based on subcarrier power allocation solution

A technology of subcarrier power and physical layer security, applied in transmission path subchannel allocation, signaling allocation, modulated carrier system, etc., can solve the problem of slow decline in the overall error probability of the OFDM system, achieve system error performance improvement, and system performance Good, guarantee the effect of transmission

Inactive Publication Date: 2020-06-02
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
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Problems solved by technology

Therefore, in a frequency-selective fading channel, as the average SNR increases, the overall error probability of the OFDM system decreases very slowly

Method used

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  • Physical layer security algorithm based on subcarrier power allocation solution
  • Physical layer security algorithm based on subcarrier power allocation solution
  • Physical layer security algorithm based on subcarrier power allocation solution

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Embodiment Construction

[0027] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] In an OFDM system, the input data is divided into K channels of parallel sub-data after serial-to-parallel conversion, and the transmit power on the k-th sub-channel is represented by p k to represent that, after IFFT transformation and parallel-to-serial transformation, the sub-data streams are sent out through each orthogonal sub-carrier to form an OFDM transmission signal. Assuming that the received signals arrive at the receiving end through each independent multipath Rayleigh fading channel, for the receiving end, the signal on the kth subcarrier after IFFT processing can be expressed as:

[0029]

[0030] In the formula is the channel multiplicative fading factor on the kth subcarrier, assuming are independent and identically distributed complex Gaussian random variables with a mean of 0 and a variance of 1. Its modulus ...

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Abstract

The invention belongs to the technical field of wireless communication physical layer security, and particularly relates to a physical layer security algorithm based on a subcarrier power distributionsolution, which is suitable for a multicarrier communication network combining the characteristics of an OFDM system. According to the algorithm, a power distribution mode of a bit error rate optimization criterion is used for carrying out power distribution on subcarriers to optimize the bit error rate performance of a system, an empirical function power distribution scheme based on the power optimization distribution mode and applied to the algorithm provided by the invention is provided, and a power distribution coefficient closed solution is obtained. An algorithm simulation result showsthat a legal receiver can reliably decode, the error rate of an eavesdropper is close to 0.5, and a power optimization allocation algorithm simulation result shows that under the condition of a low signal-to-noise ratio, the bit error rate performance is optimized by 10%-20%; under the condition of 20dB, the bit error rate performance is improved by one order of magnitude.

Description

technical field [0001] The invention belongs to the technical field of wireless communication physical layer security, and in particular relates to a physical layer security algorithm based on a subcarrier power allocation scheme, which is suitable for a multi-carrier communication network combined with the characteristics of an OFDM system, and has a positive effect on enhancing the information security performance of a 5G network. role. Background technique [0002] With the development of information technology, 5G has become the focus of attention in the field of mobile communications at home and abroad. OFDM technology has become one of the key physical layer technologies in LTE and LTE-Advanced systems due to its technical advantages such as high spectrum utilization rate and strong anti-multipath fading ability, and will be more widely used in 5G systems. Due to the broadcasting and openness of wireless channel transmission, the uncertainty of user distribution, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04L27/26H04W72/04
CPCH04L5/0057H04L5/003H04L27/2601H04W72/0473Y02D30/70
Inventor 李鸣岩郭志民吕卓陈岑张铮蔡军飞李暖暖张伟
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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