In the Internet of Things, short-distance wireless communication technology is constantly developing and innovating. Short-distance wireless communication technology is mainly divided into two categories. One is LPWAN (low-power Wide-Area Network, low-power wide area network), which is often called Wide area network communications technology. The other category is short-distance wireless communication technologies such as Zigbee, WiFI, and Bluetooth. Let’s explain these short-distance wireless communication technologies separately.
Short-distance wireless communication networking technology
1. zigbee
The name ZigBee comes from the eight-character dance of bees. Bees rely on flying and zig-zagging their wings to communicate the location of pollen to their companions. In this way, they form a communication network in the group. ZigBee technology is suitable for automatic control and remote control fields and can be embedded in various devices.
Standard: 802.15.4
Frequency: 868MHz-868.6MHz, 902MHz-928MHz and 2.4GHz-2.4835GHz
Data rate: 20kbps, 40kbps and 250kbps
Communication distance: 20-350m
Security: Medium
Application scenarios: industrial automobiles, agriculture, medical care, smart home
Advantages: low power consumption, low cost, low latency, large network capacity, short distance, support Mash network
Disadvantages: weak ability to penetrate walls, higher cost, poor self-organizing network capability, poor anti-interference performance
2. Wifi
Short-range wireless communication technology WiFi connections are often a priority for many developers, especially given the popularity of WiFi in home environments within local area networks. In addition to being clearly stated, the existing infrastructure is extensive and provides fast data transfer and the ability to process large amounts of data.
Standard: Based on 802.11n
Frequency: 2.4GHz, 5GHz frequency band
Data rate: 600 Mbps maximum, 150-200Mbps (typical).
Communication distance: 20-300m
Security: low
Application scenarios: smart homes, smart buses, subways, parks
Advantages: wide coverage, easy to use, low cost
Disadvantages: limited communication distance, high security risks, poor stability, high power consumption, and poor networking capabilities
1. Bluetooth
Short-distance wireless communication technology Bluetooth uses short baud high frequency (UHF) radio waves and uses frequency hopping technology to resist signal fading; fast frequency hopping and short packet technology can reduce co-channel interference and ensure transmission reliability; forward error correction Coding technology can reduce the impact of random noise during long-distance transmission; FM modulation can be used to reduce the complexity of equipment, etc.
Standard: Bluetooth 4.2 Core Specifications
Frequency: 2.4 to 2.485GHz
Communication distance: 10-300m
Data rate: 1Mbps
Security: high
Application scenarios: mobile phones, smart homes, wearables
Advantages: low power, low latency, support for complex networks, intelligent connection
Disadvantages: short transmission distance, average transmission rate, incompatible protocols between different devices, poor networking capabilities, and radio wave interference issues at the 2.4GHz frequency