CN-121985391-A - Magnetic induction multi-hop transmission method and system based on amplification forwarding

CN121985391ACN 121985391 ACN121985391 ACN 121985391ACN-121985391-A

Abstract

The application discloses a magnetic induction multi-hop transmission method and a magnetic induction multi-hop transmission system based on amplification forwarding, which are applied to a magnetic induction multi-hop transmission system comprising N magnetic induction coils, wherein the 1 st coil is a transmitting coil, the 2 nd to N-1 st coils are relay forwarding coils, the N th coil is a target receiving coil, the method comprises the steps of transmitting signals to the 2 nd coil through the 1 st coil, amplifying and forwarding the signals to the next coil by adopting an amplification forwarding protocol after the 2 nd coil receives the signals, calculating channel state information of each hop in the N-1 st hop link and a receiving signal to noise ratio of the subsequent coils based on an equivalent circuit model, obtaining an expression of an interruption probability and an average error rate under the condition of high signal to noise ratio based on the statistical distribution characteristic of the receiving signal to noise ratio, and solving the optimal transmitting power and optimal deployment position of the 1 st to N-1 st coils with the aim of minimizing the interruption probability and/or the average error rate.

Inventors

ZHANG YIXIN
XIE WEI
HUANG JIAN
CHENG YONGJING
ZHOU HAN
YUAN SHANDONG

Assignees

中国人民解放军信息支援部队工程大学

Dates

Publication Date: 20260505
Application Date: 20260108

Claims (10)

1. The magnetic induction multi-hop transmission method based on amplification forwarding is characterized by being applied to a magnetic induction multi-hop transmission system comprising N magnetic induction coils, wherein the 1 st coil is a transmitting coil, the 2 nd to N-1 st coils are relay forwarding coils, the N th coil is a target receiving coil, and the method comprises the following steps: Transmitting signals to the 2 nd coil through the 1 st coil, and after the 2 nd coil receives the signals, amplifying and forwarding the signals to the next coil by adopting an amplifying and forwarding protocol, so that the signals from the N-1 th coil are received by the N-th coil; Calculating channel state information of each hop in an N-1 hop link and a receiving signal to noise ratio of a subsequent coil based on an equivalent circuit model of the magnetic induction multi-hop transmission system; based on the statistical distribution characteristics of the received signal-to-noise ratio, obtaining an expression of the interruption probability and the average error rate of the magnetic induction multi-hop transmission system under the condition of high signal-to-noise ratio; and aiming at minimizing the interruption probability and/or the average error rate, and jointly solving the optimal transmitting power and the optimal deployment position of the 1 st to N-1 st coils under the constraint of the total system power and the total transmission distance.
2. The magnetic induction multi-hop transmission method based on amplification and forwarding as claimed in claim 1, wherein the obtaining the expression of the outage probability and the average bit error rate of the system under the condition of high signal to noise ratio based on the statistical distribution characteristic of the received signal to noise ratio comprises: Establishing a channel state information expression of each hop link based on the equivalent circuit model; based on the channel state information expression, establishing a statistical model of the channel state under the condition that the coil orientations obey uniform distribution in a three-dimensional space; Based on the channel state information expression and the system noise power, obtaining a receiving signal-to-noise ratio expression of each relay coil and the target coil and an approximate receiving signal-to-noise ratio expression of an Nth coil under the condition of high signal-to-noise ratio; Based on the statistical model and an approximate expression of the N-th coil receiving signal-to-noise ratio under the condition of high signal-to-noise ratio, solving a cumulative distribution function expression of the N-th coil receiving signal-to-noise ratio under the condition of high signal-to-noise ratio; and respectively calculating and obtaining the expressions of the interruption probability and the average error rate based on the cumulative distribution function expression.
3. The magnetic induction multi-hop transmission method based on amplification forwarding according to claim 2, wherein the expression of the outage probability is: Wherein, the In order for the probability of an interruption to be present, For the hop count index of a magnetically induced multi-hop transmission system, In order to receive the channel ratio threshold, For the frequency of the signal, The channel distribution coefficient of each hop link of the magnetic induction multi-hop transmission system is obtained.
4. The magnetic induction multi-hop transmission method based on amplification forwarding of claim 2, wherein the expression of the average bit error rate is: Wherein, the In order to average the bit error rate, For the hop count index of a magnetically induced multi-hop transmission system, And For the first coefficient and the second coefficient related to the modulation order and the modulation mode, For the frequency of the signal, The channel distribution coefficient of each hop link of the magnetic induction multi-hop transmission system is obtained.
5. The magnetically induced multi-hop transmission method based on amplification and forwarding of claim 4, wherein the first step is Channel state information expression of jump link The method comprises the following steps: , Wherein, the And Respectively the first The first coil and the second coil Intrinsic impedance of the individual coils; Is the first The first coil and the second coil The mutual inductance between the individual coils is such that, For the coil load resistance, For the frequency of the signal, Is the hop count index of the magnetic induction multi-hop transmission system.
6. The magnetic induction multi-hop transmission method based on amplification and retransmission according to claim 4, wherein the signal-to-noise ratio expression of the total received signal of the nth coil as the target receiving coil is: Wherein, the Is the first The received signal-to-noise ratio of the individual coils, Signal to noise ratio for the total received signal; Wherein, the Is the first Channel state information of the hop link, Is the first The power of the transmissions from the individual coils is, Is the noise power.
7. The magnetically induced multi-hop transmission method based on amplification and forwarding of claim 6, wherein the first step Reception signal-to-noise ratio of individual coils Probability density function expression of (2) The method comprises the following steps: , cumulative distribution function expression of signal-to-noise ratio of total received signal of Nth coil serving as target receiving coil under high signal-to-noise ratio condition The method comprises the following steps: 。
8. A magnetic induction multi-hop transmission system based on amplification forwarding, comprising: The N magnetic induction coils are sequentially arranged and work in a half duplex mode, wherein the 1 st coil is configured as a transmitting coil, the 2 nd to N-1 st coils are configured as amplifying relay coils, and the N th coil is configured as a target receiving coil; The control module is in communication connection with the N magnetic induction coils and is configured to transmit signals to the 2 nd coil through the 1 st coil, and after the 2 nd coil receives the signals, the signals are amplified by adopting an amplifying and forwarding protocol and forwarded to the next coil, so that the signals from the N-1 th coil are received by the N th coil; Calculating channel state information of each hop in an N-1 hop link and a receiving signal to noise ratio of a subsequent coil based on an equivalent circuit model of the magnetic induction multi-hop transmission system; based on the statistical distribution characteristics of the received signal-to-noise ratio, obtaining an expression of the interruption probability and the average error rate of the magnetic induction multi-hop transmission system under the condition of high signal-to-noise ratio; and aiming at minimizing the interruption probability and/or the average error rate, and jointly solving the optimal transmitting power and the optimal deployment position of the 1 st to N-1 st coils under the constraint of the total system power and the total transmission distance.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored program, wherein the program when run performs the method of any one of claims 1 to 7.
10. An electronic device comprising a memory and a processor, characterized in that the memory has stored therein a computer program, the processor being arranged to execute the method according to any of claims 1 to 7 by means of the computer program.

Description

Magnetic induction multi-hop transmission method and system based on amplification forwarding Technical Field The application relates to the technical field of wireless communication, in particular to a magnetic induction multi-hop transmission method and a magnetic induction multi-hop transmission system based on amplification forwarding. Background With the expansion of human living spaces and the development of modern industrial production, development and utilization of underground and underwater resources are receiving increasing attention. In order to ensure the orderly development of industrial production in extreme environments such as underground and underwater, personnel, equipment and environmental changes in the environments need to be monitored in real time, and specific requirements include soil and water quality detection, mine detection, pipeline detection, natural disaster early warning, post-disaster emergency communication and the like. To meet these application requirements, there is a need to develop wireless communication technology in limited scenarios. Unlike conventional wireless communication, which uses air as a propagation medium, a large amount of rock, soil, water and other substances exist in a limited scene, and the conductivity and dielectric constants of the medium are often greatly different and have time variability, so that electromagnetic wave signals are severely attenuated in the propagation process and the channel state is very unstable. Compared with electromagnetic waves, the magnetic induction communication has the advantages of more stable channel response, negligible multipath effect, low equipment cost and the like in the environments such as underground, underwater and the like, so that the magnetic induction communication technology has good application prospect in extreme scenes. Limited by the magnetic induction near field induction communication mode, the single-hop magnetic induction communication transmission distance is very limited. As a common technology for expanding the transmission range, the method for constructing the multi-hop magnetic induction transmission network by deploying the relay between the transmitting end and the receiving end can effectively overcome the angle selective fading of the magnetic induction channel by providing the relay diversity gain, and realize the long-distance reliable communication based on magnetic induction in the limit environment. Aiming at the defects or improvement demands of the prior art, the invention provides a magnetic induction multi-hop transmission method and a magnetic induction multi-hop transmission system based on amplification forwarding, which are used for solving the problems of limited communication distance and lower reliability caused by a near field induction communication mode and magnetic induction channel angle selective fading in the prior art. Disclosure of Invention Aiming at least one defect or improvement requirement of the prior art, the invention provides a magnetic induction multi-hop transmission method and a magnetic induction multi-hop transmission system based on amplification forwarding, which solve the problems of limited communication distance and lower reliability caused by a near field induction communication mode and magnetic induction channel angle selective fading. According to the first aspect of the invention, the magnetic induction multi-hop transmission method based on amplification forwarding is provided and is applied to a magnetic induction multi-hop transmission system comprising N magnetic induction coils, wherein the 1 st coil is a transmitting coil, the 2 nd to N-1 st coils are relay forwarding coils, the N-th coil is a target receiving coil, the method comprises the steps of transmitting signals to the 2 nd coil through the 1 st coil, amplifying and forwarding the signals to the next coil by adopting an amplification forwarding protocol after the 2 nd coil receives the signals, in this way, until the N-th coil receives the signals from the N-1 st coil, calculating channel state information of each hop in an N-1 hop link and a receiving signal to noise ratio of a subsequent coil based on an equivalent circuit model of the magnetic induction multi-hop transmission system, obtaining an expression of an outage probability and an average error rate of the magnetic induction multi-hop transmission system under a high signal to noise ratio condition based on a statistical distribution characteristic of the receiving signal to obtain an optimal allocation constraint of the N-1 st coil under a total power and total power of the system. In an exemplary embodiment, the obtaining the outage probability and the average bit error rate expression of the system under the condition of high signal to noise ratio based on the statistical distribution characteristic of the received signal to noise ratio comprises establishing a channel state information expression of each ho