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

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

3 Modulation Gaussian Filtered 2FSK +/- 175 kHz 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 – 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 Access CodeHeaderPayload + CRC(16 bit) 72 bits54 bits 0 to 2745 bits PreambleSync word + BT-AddrTrailer 4 bits64 bits4 bits Access Code AM-Addr Type CRC 4 bits3 bits 8 bits Header FlowARQ Seq 1 bit

6 Addressing BT-Addr : Bluetooth identifier, unique to each registered bluetooth type device: 48 bits /10 14 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 b 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 a 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)


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