There has been a lot of discussion about Bluetooth transmission range recently, and you may have realized that Bluetooth is no longer just a short-range wireless technology. It is flexible and can be optimized to achieve a transmission range of more than one kilometer. However, the following five points about Bluetooth transmission range may not be known.
01 Bluetooth does not sacrifice connection stability for transmission range
As you know, the transmission range would be meaningless if it does not have good reliability. Bluetooth uses a technology called "frequency hopping" to handle radio interference from other signals (such as WiFi, ZigBee, etc.) ). In fact, frequency hopping is an inherent characteristic of Bluetooth technology, regardless of the configuration used.
02 Using Coded PHYs Helps Improve Connection Reliability
The long-distance transmission mode (or coded PHY) uses FEC(Forward Error Correction) algorithms to help improve the reliability of the Bluetooth connection, and it can also break through more obstacles and walls in the environment. Therefore, it can not only achieve a longer transmission range, but also a more reliable connection (even if a longer transmission range is not required).
03 Long-distance transmission mode does not require higher transmit power
Long-distance transmission mode (or coded PHY) does not need to rely on higher transmit power, but utilizes data redundancy on the transmitter side to implement error correction and data recovery on the receiver side.
04 Transmission range can be further increased by increasing transmit power
If your application is not worried about power consumption (such as some USB powered smart hardware), you can further increase the transmission range of the Bluetooth connection by increasing the transmit power of the transmitter. In the latest new version of the specification, even Bluetooth low energy can now achieve a transmission power of up to + 20dBm.
05 Bluetooth transmission range can be flexibly adjusted at any time
The Bluetooth transmission range can be flexibly adjusted at any time. Even during a single connection, you can also adjust the transmission range flexibly at any time by switching the PHY used without reconnecting the two devices.
06 Bluetooth transmission range also has relations with receiver sensitivity.
Bluetooth technology specifies that devices must be able to achieve a minimum receiver sensitivity of -70 dBm to -82 dBm, depending on the PHY used. However, Bluetooth implementations typically achieve much higher receiver sensitivity levels of -95 dBm or better.
Think of receiver sensitivity as a measure of how well you can hear or the quietest sound you can hear and understand. Receiver sensitivity is the measure of the minimum signal strength a receiver can interpret. In other words, it’s the lowest power level at which the receiver can detect a radio signal, maintain a connection, and still demodulate data.
As you can see, unlike many other low-power wireless technologies, Bluetooth has the flexibility to allow you to optimize the connection and achieve the transmission range required by your application, if you want to learn more about the impact on the transmission range between two Bluetooth devices Key factors, to estimate the transmission range, visit Feasycom.com to find out more information.