EECS 373 Design of Microprocessor-Based Systems Mark Alitawi Sarah Spitzer Kaiyu Yan University of Michigan Radios November 27, 2012.

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Presentation transcript:

EECS 373 Design of Microprocessor-Based Systems Mark Alitawi Sarah Spitzer Kaiyu Yan University of Michigan Radios November 27, 2012

What are radios o How do they work? Fundamental characteristics o Design tradeoffs Common radio standards/protocols o Where characteristics fall under (above) Applications o Choosing a specific type of radio Outline

A device that enables wireless transmission of signals o Electromagnetic wave o Transmitter sends signal to Receiver What are Radios?

Modulation o Properties of Fourier transforms o Analog/Digital o Frequency vs Amplitude vs. Phase, etc. How Radios Work - Transmitting

Envelope Detection o Detect carrier freq. Filters Demodulation How Radios Work - Receiving

Antenna picks up modulated radio waves Tuner filters out specific frequency ranges Amplitude variations detected with demodulation Amplifier strengthens the clipped signal and sends it through the speaker How Radios Work – Receiving (AM Radio Example)

Why so many protocols? Types/Advantages/Disadvantages o Short vs. long distance o high vs. low power/energy o high vs. low speeds Physical Constraints o Feasibility Radio Characteristics

Bluetooth Zigbee/ ANT WiFi Common Radio Protocols

Radio band: GHz Average 1 Mbps - Up to 3 Mbps Supports point-to-point and point-to-multipoint o Creates personal area networks (PANs/Piconets) o Connects up to 8 devices simultaneously Minimal interference between devices o Devices alter frequencies arbitrarily after packet exchanges -up to 1600 times/second - frequency hopping 3 classes of Bluetooth Bluetooth

Wireless communication between devices o Mobile phones, laptops, cameras, gaming controllers, computer peripherals, etc Short range sensor transmission Share multimedia - pictures, video, music A2DP - Advanced Audio Distribution Profile o Stream audio wirelessly Bluetooth Applications

Zigbee is built on top of Radio bands: 868MHz in Europe, 915MHz in US and Australia. 2.4GHz else worldwide. Low data-rate kbps, low power – Up to 1000 days Transmits over longer distances through mesh networks Zigbee/

Wireless environmental sensors o Temperature, pressure, sound, luminous intensity Medical devices o Glucose meters, heart monitors Household automation o Security/temperature controllers o Smoke/motion detectors Zigbee/ Applications

Radio band: 2.4GHz Periodic transfers of small amounts of sensor info between - burst messaging High efficiency o Low overhead, minimal wakeup time Minimizes interference by using Direct-Sequence Spread Spectrum (DSSS). Limited to sensor applications o Short range - Highly reliable up to 3m o Limited speed - 1 Mbps o Low power - Transceiver batteries last up to 3 years ANT

Sensors that are updated on the order of seconds o Performance monitoring, medical, heart rate o Humidity, temperature o Speed/distance traveled monitors ANT Applications

Dual Bands: 2.4GHz and 5GHz a/b/g/n o Cost vs Speed vs Interference tradeoff Roaming Global standard High speed o Up to 300 Mbps High power consumption o Concern for mobile devices Range o Up to 100m WiFi

WiFi – example (802.11g)

Internet/Networks o Businesses o Schools o Home Examples: Computers, phones, XBox, Airplay WiFi Applications

Protocol Comparisons

Bluetooth Zigbee/ ANTWiFi SpeedModerateLowModerateHigh Range Moderate - High HighLowHigh Power Consumption Low - Moderate Low High Protocol Comparisons

Questions? Comments? Discussion?