Bluetooth

Bluetooth is a wireless technology standard for exchanging data over short distances (using short-wavelength radio transmissions in the ISM band from 2400–2480 MHz) from fixed and mobile devices, creating personal area networks (PANs) with high levels of security. Created by telecom vendor Ericsson in 1994,[2] it was originally conceived as a wireless alternative to RS-232 data cables. It can connect several devices, overcoming problems of synchronization. Bluetooth is managed by the Bluetooth Special Interest Group, which has more than 19,000 member companies in the areas of telecommunication, computing, networking, and consumer electronics.[3] Bluetooth was standardized as IEEE 802.15.1, but the standard is no longer maintained. The SIG oversees the development of the specification, manages the qualification program, and protects the trademarks.[4] To be marketed as a Bluetooth device, it must be qualified to standards defined by the SIG.[5]A network of patents is required to implement the technology, which is licensed only for that qualifying device.

Features

  • Frequency : 2.4GHz ISM band, Frequency hopping
  • Modulation : Gaussian shaped BFSK
  • Data rate : 723Kbps
  • Operating range : 10m~100m
  • Size : 28mm x 15mm x 2mm (Mitsumi WML-C05)
  • Cost : Long term: $5/endpoint ($20 currently
  • Power : 0.1W (Active)
  • Security : Good. FHSS. Link layer authentication and encryption
  • Acceptance : SIG have about 2500 member companies

Technical Challenges Solutions

  • Global operation : 2.4GHz ISM band
  • Interference from other devices using : ISM
  • Low power consumption Power control; Power-saving modes,Programmable packet length ,Moderate data rate
  • Low cost : FHSS, TDMA, low receiver sensitivity, Relaxed link budget, Low IF
  • Security : FHSS, link layer security (Authentication and Encryption)
  • High error probability : of wireless link ARQ, FEC and CVSD (audio)
  • Voice/Data support : Circuit/Packet Switching

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