UNIK4700/9700-Introduction

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UNIK4700/9700-Introduction

Course	UNIK4700, UNIK9700
Title	Introduction
Lecture date	2013/08/31
presented	by Josef Noll
Objective	This lecture provides an introduction to the topic. It will address Radio Systems Mobility The lecture will also include details on the expected outcome, the deliverables and the (optional) exam
Learning outcomes	Having joined this lecture, you will have an impression on where to focus have an impression on the topics being discussed in this course get an impression on what is expected from you in terms of deliverables (presentation, papers) understand how to search for literature on IEEE and ACM
Pensum (read before)	You should have registered for this course :-) Please read also how to search for literature: Search_for_literature
References (further info)	References: The History of Wireless Communication: http://www.youtube.com/watch?v=X5jPoQzEh-M http://wiki.unik.no/index.php/Courses/UNIK4700topics
Keywords	Radio, Mobility, Mobile Systems, Capacity

this page was created by Special:FormEdit/Lecture, and can be edited by Special:FormEdit/Lecture/UNIK4700/9700-Introduction.

Other info

• Google Community: https://plus.google.com/communities/107897964181233758835?cfem=1
• Search for literature
• Streaming at mms://lux.unik.no/301, for video recording, see the information on UNIK4700

• Media:UNIK4700-l1-h13.pdf

Slide Show

Title

UNIK4700/UNIK9700 Introduction

Author

Josef Noll,

Footer

UNIK4700/9700-Introduction

Subfooter

UNIK4700/UNIK9700

⌘ Overview UNIK4700, UNIK9700

Radio and Mobility

• first lecture
• sign up to cwi.unik.no Signup
  • confirm your email
  • add yourself to UNIK4700H13Participants
• what do you expect
  • discuss
  • tell

Goal of the course,

• what to achieve
• how to achieve it

Examen

• • what to I expect

⌘Meeting calendar

• will be published through this wiki: http://cwi.unik.no/wiki/UNIK4700
• see also lectures from earlier years

based on

• your topics
• the goal we want to achieve

⌘ What to achieve

Academic work

• how we build up list of references
• modelling approach
• detailed list of topic (next slide)

⌘Examen

• Presentation of research topic (mandatory), home work on comparison of selected topics (60 %) and simulation work (40 %).
• The student may ask for an oral exam in which case the home work on comparison of selected topics counts 50%, the simulation work 30% and the oral exam 20%.

Mandatory

• knowledge of presentation material - "how you presented"
• presentation and analysis of 3-4 papers
• programming of user, context....

⌘Evaluation/Grade

Expectations for your presentation

• Define what to present
• Present it such that your colleagues can understand
• Facts/Reference-based presentation
• Evaluate your own work
• Checklist
  • relevant for the course
  • understandable
  • your own evaluation
  • scientific: "Don't guess, present references"

Character, Exam

For your own presentation

• focus, focus, focus - be aware of what you want to present, and what not
• make sure the others will understand what you present
• come up with challenges/unsolved issues/your expectation towards that technology

not basis for grade are

• questions during lectures

Alternativer

• evtl "mini-eksamen" i slutten av hver time, spørsmål om spesielle områder

⌘ Goals Radio

• Understand that "radio is not just another IP connection"
• Set-up a good course
• Involve you in giving the course

Radio

• get a basic understanding of radio communication
• can explain the characteristics of radio propagation
• get a feeling for wave propagation and the attenuation

⌘Goals Mobility

• identify the factors for mobility management
• know the characteristics of current mobility schemes
• address topics in current research

Mandatory

• knowledge of presentation material
• presentation and analysis of 3-4 papers
• simulation

Evaluation (draft)

• presentation of topics (own work)
• simulation results
• optional: (final exam)

⌘ Assigned topics 2012

• Ali Zaher: RFID/NFC
• Dag Ove Eggum: Wimax
• Håvard Austad: Antennas
• Joachim Tingvold: Wave Propagation Parameters
• Johan Tresvig: Wireless HART, ++ISO100, Bluetooth, Zigbee
• Susana Rodriguez de Novoa: WLAN
• Thomas Aasebø: ANT+, Bluetooth, Zigbee
• Naji: Basics of Handover, examples from GSM and UMTS
• Gerard: Attenuation of tropical rain forest in GSM (?), Wifi and WiMAX

⌘Detailed TOC - General

• History of wireless communications
• History of wireless terminals
• Future trends on wireless communications
• Wireless standardisation forums
• Current wireless technologies
• Technologies and user
• Wireless network types

⌘TOC - Basics of communication

• Electromagnetic signals
• Nyquist Theorem
• Signal/noise ratio
• Shannon Theorem
• Signal strength

⌘TOC - Signal propagation

• Antenna types
• Radiation patterns
• Antenna gain
• basic propagation models (ground wave, sky wave and line of sight (LoS) propagation)
• optical vs radio LoS
• attenuation (free space)
• Noise (thermal, intermodulation, crosstalk, impulse noise)
• Atmospheric absorption
• Multipath propagation
• refraction, reflection, diffraction and scattering
• fading (fast, slow, flat, selective, Rayleigh, Rician, …)

⌘TOC - Propagation models

• Environments (indoor, outdoor to indoor, vehicular)
• outside (Lee, Okumura, Hata, COST231-Hata, COST231-Walfish-Ikegami)
• inside (One-slope, multiwall, linear attenuation)

⌘TOC - Radio interference (see Kaosher's course)

• Co-channel, adjacent-channel, intermodulation, near-end-to-far-end, inter-symbol, simulcast
• Local scatterers
• Frequency planning

⌘TOC Comparison of access technologies

• proximity: RFID and NFC
• short range: ZigBee, Bluetooth and Wibree
• local: Wireless LAN,...
• mobile: GSM, UMTS, IMT-A (WiMAX, LTE)

⌘TOC - Mobility

• Mobility challenges for existing systems
• WLAN Mobile Network

Second half of course will deal with mobility

⌘The five myths of wireless

1. Wi-Fi is faster than Ethernet. While the raw data rate of Wi-Fi (11 Mbps) may be faster than the original Ethernet (10 Mbps), Wi-Fi's throughput efficiency is always less. Why?
2. The longer the transmission range, the better. That may be true for some wireless communications, but for wireless LANs, a greater transmission range often results in more users per cell and lower per-user throughput. Why?
3. Wireless networks can be dangerous to your health. Almost all wireless LANs have radio output levels of less than 100 milliwatts (20 dBm). Is output power the real measure?
4. 802.11g will make 802.11a obsolete. Lots of people think that 802.11g will kill 802.11a because it offers the same data rate as 802.11a (54 Mbps) plus backward compatibility with 802.11b. Other factors?
5. Wireless LANs are inherently insecure. Yes, there are security issues with the original 802.11b specification, but there are plenty of ways, including the use of VPNs and security gateways, to make wireless as secure as wired. True?

Note: 802.11 is sending with different speeds for header and payload. Header is always transmitted at lowest speed, why?

⌘Wireless Communication

• electromagnetic wave
• wave propagation
• attenuation, scattering

⌘Summary

Focus on three communication areas

• ultra short range, e.g. NFC
• vicinity, e.g. Bluetooth
• local area, e.g. WLAN
• mobile communications, e.g. LTE

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