1 / 8

Quiz

Quiz Sketch the time domain waveform and spectrum, labeling all important features, of a rectangular pulse of 2.4 Ghz having 1 uS duration. Bluetooth. Operation in the Industrial/Scientific/Medical (ISM) band @ 2.4 Ghz “Low power, uncoordinated, interference dominated RF environment”.

garth
Télécharger la présentation

Quiz

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Quiz Sketch the time domain waveform and spectrum, labeling all important features, of a rectangular pulse of 2.4 Ghz having 1 uS duration.

  2. Bluetooth Operation in the Industrial/Scientific/Medical (ISM) band @ 2.4 Ghz “Low power, uncoordinated, interference dominated RF environment” • Pico-Net architecture • One master • Up to seven active slaves • Up to 200 inactive (parked) slaves • Devices may participate in multiple pico-nets (scatternet) • Master in one pico-net may be slave in another • Transmit Power • Class-1: 100 mW • Class-2: 0.25 to 2.5 mW • Class-3: 1 mW • 10 m range for Rx sensitivity of -70 dBm, 10-3 BER

  3. Modulation • Gaussian Filtered 2FSK +/- 175 kHz deviation@ 1 M-symbol/sec (1bit/symbol) • Frequency Hopping at 1600 hops/sec • 625 uS “Hop slot” • 366 uS per slot available for one data packet • Masters transmit in even numbered slots • Addressed slaves transmit in next odd slot • Packets may be extended to three or five slots • Five different hopping sequences • 79 One-Mhz channels between 2400 – 2483.5 Mhz • Maximum throughput is 721/57.6 or 432.6/432.6 kb/s Synchronous Connection Oriented (SOC) protocol – voice Asynchronous, connectionless (ACL) protocol – packet data • Error Correction: • 1/3 rate FEC • 2/3 rate FEC • ARQ

  4. Packet Types • System Packets: • NULL, POLL, FHS • Medium Rate error-protected(2/3 rate FEC) • DM1, DM3, DM5 • High Rate Unprotected (No FEC in Payload) • DH1, DH3, DH5 • Digitized Audio, 3 levels of error protection • HV1, HV2, HV3 • Mixed data/voice • DV • Other • AUX

  5. Packet Structure 0 to 2745 bits 72 bits 54 bits Access Code Header Payload + CRC(16 bit) 4 bits 64 bits 4 bits Access Code Preamble Sync word + BT-Addr Trailer 3 bits 4 bits 1 bit 1 bit 1 bit 8 bits Header Type Flow ARQ AM-Addr Seq CRC

  6. Addressing • BT-Addr : • Bluetooth identifier, unique to each registered bluetooth type device: 48 bits /1014 possible • AM-Addr: • 1-7 for each Active Member slave; 0 broadcast to all • PM-Addr: • 8 bit Parked Member address assigned before parking device

  7. Link Synchronization • ACL – Asynchronous connection link • Used for Data, • Error detection/ARQ • SCO-Synchronous Connection Oriented • Used for voice or other real-time data • Reserved transmission slots • FEC – no retransmission

  8. Wi-Fi(Wireless Fidelity) • Extension to IEEE 802.11b in 1999 by WECA (Wireless Ethernet Compatibility Alliance) • Operation in ISM band with data rates of 5.5 and 11 Mbits/sec (nominal) ,1 and 2 Mb/s fallback rates • Direct sequence modulation • Complimentary Code Keying (CCK) • Packet Binary Convolutional Coding (PBCC) • Assigned 22 Mhz region in ISM band, overlapping Bluetooth – so bluetooth is required to “hop over” this band if Wi-Fi is detected. • 802.11a also defines assignments in the UNII (Unlicensed National Information Infrastructure) band at 5 Ghz. • 6 Mb/s to 54 Mb/s using OFDM (Orthogonal Frequency-Division Modulation)

More Related