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energy-saving self-adaptive virtual MIMO transmission method in LoRa uplink system

A transmission method and self-adaptive technology, applied in the transmission system, radio transmission system, energy consumption reduction, etc., can solve the problems of deteriorating network performance, common SF interference, and inability to meet the requirements of mIoT large-scale EDs to access the network, and achieve high Effects of Energy Efficiency Communication and Energy Efficiency Optimization

Active Publication Date: 2021-06-22
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the orthogonality brought by the unique CSS modulation, LoRa can support parallel transmission of up to 6 EDs with different configurations of spreading factors (SFs) in the same frequency band, but this is far from accommodating the requirements of densely deployed mIoT applications. Mass ED communication required
Even though multi-channel transmission is available in the LoRa system, it still cannot meet the requirements of large-scale EDs accessing the network in mIoT
Considering the limited number of SF values ​​in the LoRa system, when more EDs are required to access the LoRa network of the same frequency band, some of the EDs will inevitably adopt the same SF, which will cause common SF interference, and EDs with the same SF will caused by the interference introduced into the system, which will further deteriorate the network performance

Method used

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  • energy-saving self-adaptive virtual MIMO transmission method in LoRa uplink system

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Embodiment 1

[0052] See figure 1 , figure 1 It is a schematic flowchart of an energy-saving adaptive virtual MIMO transmission method in a LoRa uplink system provided by an embodiment of the present invention. As shown in the figure, the method of the present invention includes:

[0053]S1: Obtain the maximum energy efficiency of the SIMO transmission system in the LoRa uplink system;

[0054] S2: Obtain the maximum energy efficiency of the system for virtual MIMO transmission in the LoRa uplink system;

[0055] S3: Compare the maximum system energy efficiency of SIMO transmission with the system maximum energy efficiency of virtual MIMO transmission;

[0056] S4: Select the transmission corresponding to the maximum energy efficiency of the larger system as the transmission of the LoRa uplink system.

[0057] Among them, the energy efficiency of the terminal in the LoRa uplink system is calculated according to the following formula,

[0058] n m =R m / (p m +P c ), m∈K (1),

[005...

Embodiment 2

[0112] This embodiment simulates and evaluates the method in Embodiment 1 through Monte Carlo simulation. The LoRa uplink system of this embodiment has a gateway and two EDs, wherein the gateway is equipped with 4 receiving antennas, and each ED is equipped with a transmitting antenna. In a circular area with a radius of 10 km, EDs are evenly distributed around the gateway. The maximum transmission power of each ED is set to 17dBM in the CN470-510MHz band. The path loss coefficient α is set to 4, and the distance d from the ED to the gateway is up to 10km. The noise power is -123dBm and the bandwidth is 125KHz.

[0113] Please refer to Figure 5 and Image 6 , Figure 5 is a CDF curve diagram of different system energy efficiency (EE) provided by the embodiment of the present invention; Image 6 is the system average energy efficiency (EE) diagram under different maximum power provided by the embodiment of the present invention. In the figure, SIMO represents the CDF cu...

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Abstract

The invention relates to an energy-saving self-adaptive virtual MIMO transmission method in a LoRa uplink system. The energy-saving self-adaptive virtual MIMO transmission method comprises the following steps: acquiring the maximum system energy efficiency of SIMO transmission in the LoRa uplink system; obtaining the system maximum energy efficiency of virtual MIMO transmission in the LoRa uplink system; comparing the system maximum energy efficiency of the SIMO transmission with the system maximum energy efficiency of the virtual MIMO transmission; and selecting the transmission corresponding to the larger maximum energy efficiency of the system as the transmission of the LoRa uplink system. According to the energy-saving self-adaptive virtual MIMO transmission method in the LoRa uplink system, virtual MIMO transmission is introduced into the LoRa system by using a multi-antenna technology of the LoRa gateway, so that the problem of interference caused by terminals with the same expansion factor is solved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an energy-saving adaptive virtual MIMO transmission method in a LoRa uplink system. Background technique [0002] Low-power wide-area network (LPWAN) technology holds great promise in supporting massive Internet of Things (mIoT) applications, which are characterized by a large number of terminals (EDs), low power consumption, and long communication range. Among existing LPWAN technologies, LoRa has recently attracted much attention in facilitating mIoT applications due to its advantages of utilizing Chirp Spread Spectrum (CSS) modulation and operating in license-free frequency bands. [0003] Due to the orthogonality brought by the unique CSS modulation, LoRa can support parallel transmission of up to 6 EDs with different configurations of spreading factors (SFs) in the same frequency band, but this is far from accommodating the requirements of densely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/70H04W24/02H04B7/0413
CPCH04W4/70H04W24/02H04B7/0413Y02D30/70
Inventor 牛进平杨香郭艺张李颉麦杰李艳艳陈晓江房鼎益
Owner NORTHWEST UNIV(CN)
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