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Parameter selection method of low power wide area network lora for v2x communication of Internet of Vehicles

A technology for parameter selection and Internet of Vehicles, which is applied in the field of Internet of Things and can solve problems such as fast fading, signal distortion, and slow fading.

Active Publication Date: 2020-07-07
QINGDAO ACADEMY OF INTELLIGENT IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the symbol interval T of the transmitted signal sym c , then it is considered that the received signal is experiencing slow fading, that is, the signal can remain unchanged in several symbol intervals during the transmission process in the channel; if the symbol interval T of the transmitted signal sym >T c , then it is considered that the received signal experiences fast fading, also known as time-selective fading. At this time, the amplitude and phase of the signal change greatly during the transmission process, causing signal distortion. Accurate estimation and equalization of the channel will bring extreme big difficulty

Method used

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  • Parameter selection method of low power wide area network lora for v2x communication of Internet of Vehicles
  • Parameter selection method of low power wide area network lora for v2x communication of Internet of Vehicles
  • Parameter selection method of low power wide area network lora for v2x communication of Internet of Vehicles

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Embodiment

[0029] see Figures 1a-1f , to simulate six typical vehicle-to-everything V2X communication scenarios. Scene 1: V2V Expressway Oncoming; Scene 2: V2V Expressway Same Direction with Wall; Scene 3: V2V Urban Canyon Oncoming; 4: V2R Expressway scene (V2R Expressway); Scene 5: V2R Urban Canyon Oncoming scene (V2R Urban Canyon Oncoming); Scene 6: V2R Suburban Street scene (V2R Suburban Street). The channel parameters of each scene are shown in Table 1.

[0030] Table 1

[0031] Scenes speed(km / h) Doppler frequency shift (Hz) scene 1 104 1000-1200 scene 2 32-48 300 scene 3 104 900-1150 scene 4 104 600-700 scene 5 32-48 400-500 scene 6 32-48 300-500

[0032] Table 1 lists the moving speed and Doppler frequency shift range of the vehicle in each scene. According to Table 1, the coherence time T of the channel corresponding to each scene can be calculated c . The coherence time T c The symbol interval T of LoRa configure...

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Abstract

The invention relates to a parameter selection method for low power wide area network (LPWAN) LoRa for Internet of Vehicles (IoV) V2X communication. The method provided by the invention has the advantages that six typical IoV V2X communication scenarios are simulated to cover large-scale Doppler frequency shifts; and coherence times Tc of corresponding channels of the scenarios are compared with symbol periods Tsym configured by LoRa, and smaller spreading factors and larger bandwidths are selected to shorten the symbol periods Tsym, so that the symbol periods Tsym are shorter than the coherence times Tc, which can avoid time-selective fading and achieve better system performance.

Description

technical field [0001] The invention belongs to the technical field of the Internet of Things, and relates to low-power wide-area network technology, in particular, to a method for selecting low-power wide-area network parameters for V2X communication in the Internet of Vehicles. Background technique [0002] Low Power Wide Area Network (LPWAN) technology is oriented to the long-distance and low-power communication requirements of the Internet of Things. An Internet of Things access technology that has emerged in recent years is a new type of machine-to-machine (Machine- to-Machine) wireless access technology, which has the characteristics of low bandwidth, low power consumption, long distance, and supports massive connections. Typical LPWAN technologies include LoRa (Long Range), NB-IoT, SigFox, NWave, OnRamp, Platanus, Telensa, Weightless, Amber Wireless, etc. These technologies have the technical characteristics of wide range, long distance, and low power consumption. L...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/391H04B17/382H04B1/69H04W4/46H04W4/44
CPCH04B1/69H04B17/382H04B17/3912Y02D30/70
Inventor 李玉珂韩双双杨林瑶王飞跃
Owner QINGDAO ACADEMY OF INTELLIGENT IND