This time, we’re going to talk about How Far Can A Bluetooth Signal Reach. There is a lot of information about Bluetooth Range Samsung on the internet, of course. Social media are getting better and better quickly, which makes it easier for us to learn new things.

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18 Reference List: How Far Can A Bluetooth Signal Reach | Bluetooth Range In Meters

  • But the very next month, in July 2013, this perfect world started to crumble. Google released Android 4.3 making the Nexus 4 the first Android phone to support Bluetooth LE and beacon detection. Over the next 7 years, 18 additional iPhone models would come out along with thousands of Android models. Every single one of these devices has differences in the Bluetooth chip, radio circuitry, antenna and case that affect the signal level the phone receives. - Source: Internet
  • The units are decibels relative to one milliiwatt (dBm), and values are negative with more negative signals indicating a weaker signal. This is a logarithmic unit so a decline in 10 dB of signal level (e.g. from -50 dBm to -60 dBm) means that the power has declined by a factor of 10 – only 10% of the signal power remains. - Source: Internet
  • Radio Frequency: It refers to electromagnetic radio waves and their rate of oscillation in the range of 3 kHz to 300 GHz. Radiofrequency also focuses on the alternating currents that carry the radio signals. In addition, it is used for transmission, communications, and broadcasting. - Source: Internet
  • IR headphones use infrared waves for effective listening experience. It is because these headphones don’t hinder the frequencies of others. As a result, you get a disturbance-free, smooth, and high-quality sound. Infrared headphones are available in both dual and single channels. With dual channels, you can listen to two signals without any interference at the same time. - Source: Internet
  • The pulsations of the IR headphones act as “on and off signals,” which are received and interpreted by the receiver into sound waves that are audible to the ear. Infrared headphones have an effective range of 10 meters or 30 feet. However, a clear line of sight is required between the transmitter and receiver. - Source: Internet
  • Non-Spherical Antenna Patterns : antennas are not equally good at transmitting or receiving signals in every direction. Every phone model has a different antenna and the signal will be weaker in some directions. When graphed, this typically looks like a heart-shape. On one side there is a pronounced recession with a weaker transmission/reception. Depending on how you point your phone, signal levels will change. - Source: Internet
  • The answer to that question depends on the strength of the transmitter and how good the receiver is at picking it up. The solution to this problem is to measure the signal at a known distance. A distance of one meter is typically used because it is close enough for the signal to be strong but far enough to avoid “near field” effects that can make radio signals unpredictable. - Source: Internet
  • Human body : The human body is an obstruction – a big bag of conductive salt water. A crowd will absolutely attenuate signals. A dense crowd more so. - Source: Internet
  • The calibration plan above worked great for a short time, because in June 2013 there were exactly two models of phones that could detect an iBeacon – the iPhone 4S and the iPhone 5. When it came time to calibrate your beacon, you used one of these two phones to do the reference measurement. As chance would have it, both phones measured about the same signal level when seeing the same beacon. - Source: Internet
  • The idea is simple. A radio transmitter sends out a signal to a receiver. The receiver measures the strength of the signal. When the transmitter is close, the signal is strong. When the transmitter is far, the signal is weak. - Source: Internet
  • So a simple distance estimation might work like this:. If the known measured signal level at 1 meter is -50dBm, and we see a slightly weaker signal, then that means the estimated distance is just a bit further than one meter. To aid in this calculation, a Bluetooth transmitter can actually send a data packet containing this “measured power” or “tx power” value. That way the receiver knows the proper reference point for different transmitters with different power levels. - Source: Internet
  • Obstructions : Walls, furniture, shelving, plants, he human body and other objects all absorb or reflect radio energy to some degree (more than air, anyway). In general, plastic and wood tend to be fairly transparent to Bluetooth frequencies. Metal is much less so. Whenever there are obstructions between the transmitter and the receiver, the signal level will go down relative to what it would have been with a clear line of sight. How much so depends on the materials in the obstructions and if the radio waves can find a way around them. - Source: Internet
  • While that equation works, it is typically not as good at estimating distance as power functions using a curve fitting technique. The reason the equation offered by physics doesn’t work quite as well in practice is because there are other factors going on that involve more than radio signal theory (more on that below.) Here is an equation with a similarly shaped curve derived experimentally using a Nexus 4 as a Bluetooth receiver. This is Java code: - Source: Internet
  • Bluetooth Headphones can detect low power signals. It consumes less battery power than other devices. Cons Many High-end Bluetooth headphones are expensive. - Source: Internet
  • While Apple devices tend to deviate less from the old iPhone 4S and 5 reference signal levels, there are significant variations, especially on iPad models. Android phones, however, are all over the map. While many are excellent Bluetooth LE receivers, some are horrible. I have a Huawei P9 Lite that can’t detect a typical beacon more than 20 feet away. Its detected signal level at short range is often 15 dB weaker than iPhone models. - Source: Internet
  • The above equation estimates distance using the measured power at one meter (received from the transmitter via a field in a transmitted data packet) and the signal strength measured by the Bluetooth chip. The signal strength is measured on a phone using a field called the Received Signal Strength Indicator with units in dBm. (More on that later.) - Source: Internet
  • Apple’s plan for handling hardware transmitter variations was called calibration. An iPhone app would be used to collect signal levels when the phone was held precisely 1 meter away. This procedure would give you an averaged value over, say, 30 seconds. The reference RSSI at 1 meter could then be programmed into the beacon transmission as a one byte value. - Source: Internet
  • Reflections: All objects, but particularly metal ones tend to reflect radio waves. The effect is not as simple as visible light in a mirror, but the result is analogous. This can amplify signals if extra radio energy arrives at the receiver due to reflections. - Source: Internet
How Far Can A Bluetooth Signal Reach - Enhance Bluetooth Signal

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