tecnología de comunicación inalámbrica de corto alcance

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.

Tecnología de redes de comunicación inalámbricas de corta distancia

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