Course Project Feedback and grading have been sent Revise your project goals if you want First project interim milestone in two weeks Managing schedule imbalance

• Team 1-3: interim milestones with shorter intervals, but more time for final presentation

• Team 4-5: more time between interim milestones, but earlier final presentation

Lab will be open starting from this Friday Use the lab equipment: oscilloscope, signal generator, etc No lab lecture is provided Lab attendance is not required

ECE 1161/2161 Embedded Computer System Design 2 1

ECE 1161/2161Embedded Computer System Design 2

Embedded Communication - 2

Wei Gao

Spring 2018 2

Cross-Technology Communication Devices with heterogeneous wireless connectivity

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Cross-Technology Communication How to interconnect/bridge them?

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Cross-Technology Communication Intuitive solution: gateway High deployment cost Inflexibility

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Cross-Technology Communication Direct communication across heterogeneous radios

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Why this is useful? Co-existence and collaboration

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Why this is useful?

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Why this is difficult? Heterogeneity of wireless PHY

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WiFi PHY QAM modulation Rate: >54 Mbps Distance: >100m Tx: 26 dBm Sensitivity: -60 dBm

ZigBee PHY OQPSK modulation Rate: ~250 Kbps Distance: ~100m Tx: 0 dBm Sensitivity: -97 dBm

Why this is difficult? Heterogeneity of wireless PHY

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How to translate? Signal manipulation Data rate: <1 kbps

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How to translate? Signal emulation: A part of WiFi frame is a ZigBee

frame

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Modulation Basics Signal decomposition

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PHY Modulation in WiFi Quadrature Amplitude Modulation (QAM)

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In-Phase

Quadrature

PHY Modulation in ZigBee Offset Quadrature Phase-Shift Keying (OQPSK)

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Signal Emulation

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Signal Emulation

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Signal Emulation Addressing the timing heterogeneity 4 WiFi symbols correspond to 1 ZigBee symbol

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Across other technologies? More advanced features to consider Bluetooth Frequency-hopping channels How to emulate with the right frequencies?

Cellular links Interaction with cloud RANs

Narrowband to broadband?

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