Device Bluetooth normal open case, still can not search the solution is as follows:
1. First of all, in the home building to find and open the devices and printers, to ensure that the computer has a Bluetooth device.
2. At this time, the Bluetooth device is incomplete, when running will show that the peripheral device can not be found.
3. This shows that the computer's lack of drivers, so download a Bluetooth driver, pay attention to must be adapted.
4. Then download and install it.
The Bluetooth band is 2400-2483.5MHz (including the guard band). This is the worldwide unlicensed (but not unregulated) 2.4 GHz short-range radio band in the Industrial, Scientific and Medical (ISM) band.
Bluetooth uses frequency hopping technology to split the transmitted data into packets, which are transmitted over each of 79 designated Bluetooth channels. Each channel has a bandwidth of 1 MHz. Bluetooth 4.0 uses 2 MHz spacing and can accommodate 40 channels. The first channel starts at 2402 MHz and continues every 1 MHz to 2480 MHz. with Adaptive Frequency-Hopping (AFH), this is typically 1600 hops per second.
Initially, Gaussian frequency-shift keying (GFSK) modulation was the only available modulation scheme. However, Bluetooth 2.0+EDR has enabled the use of π/4-DQPSK and 8DPSK modulation in compatible devices. Devices running GFSK are said to be able to operate at Basic Rate (BR), with instantaneous rates of up to 1 Mbit/s.