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          上海煜品

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          蓝牙Bluetooth技术介绍

          蓝牙版本的发展历史:
          - Bluetooth 1.2
          - Bluetooth 2.0+EDR Add EDR mode
          - Bluetooth 3.0+HS Add AMP controller & HS mode
          - Bluetooth 4.0 Add Low Energy mode
          - Bluetooth 4.2 Support 6LowPAN
          - Bluetooth 5.0 Better data rate, support Geo-location, Support LE2M
          - Bluetooth 5.2 LE-audio

          蓝牙按照无线的技术分为:
          Low Energy 低功耗蓝牙,其特点为
          - 40 channels 
          - 3 broadcasting channels; 37 data channels
          - 2MHz separation of carrier
          - GMSK/FSK modulation with 0.5 Mod Index
          - Data packet (1M/2M)
          - Use 802.11 PAL,  AMP Structure
           
          FHSS 经典跳频蓝牙,其特点为
          - 79 channels 
          - 1MHz separation of carrier
          - GFSK, π/4-DQPSK, 8DPSK
          - 1Mbps, 2Mbps, 3Mbps
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