Wireless Communications Research Overview
EE 522: Wireless CommunicationsDr. Ghazi Al Sukkaremail:
[email protected]
1Course Information:Instructor: Dr. Ghazi Al Sukkar.Email:
[email protected]: E315Website:
www2.ju.edu.jo/sites/acadimic/ghazi.alsukkar Office Hours: See
website.Prerequisites: EE421 Preferred EE422 and EE426Textbook:
Wireless Communications, Principles and Practice. 2nd edition or
above, Theodore S. Rappaport.References: Wireless and Cellular
Telecommunications, 3rd edition, William C. Y. Lee, 2006.
2Course Syllabus:Introduction: Wireless Communicatios.Cellular
Networks principles:2G systems: GSM:Spread Spectrum Techniques.3G
systems: UMTS Orthogonal Frequency Division Multiplexing.4G
systems: LTE-AdvanceFor details see:
http://www2.ju.edu.jo/sites/Academic/ghazi.alsukkar/Material/Forms/AllItems.aspx3Introduction
Outline:The Wireless VisionTechnical ChallengesCurrent Wireless
SystemsEmerging Wireless SystemsSpectrum RegulationStandards
4Wireless HistoryRadio invented in the 1880s by MarconiMany
sophisticated military radio systems were developed during and
after WW2Cellular has enjoyed exponential growth since 1988, with
almost 6 billion users worldwide todayIgnited the wireless
revolutionVoice, data, and multimedia becoming ubiquitousUse in
third world countries growing rapidlyWifi also enjoying tremendous
success and growthWide area networks (e.g. Wimax) and short-range
systems other than Bluetooth (e.g. UWB) less successful Ancient
Systems: Smoke Signals, Carrier Pigeons, 5Future Wireless
NetworksUbiquitous Communication Among People and Devices
-Next-generation Cellular-Wireless Internet Access-Wireless
Multimedia-Sensor Networks -Smart Homes/Spaces-Automated
Highways-In-Body NetworksAll this and more 6ChallengesNetwork
ChallengesScarce spectrumDemanding/diverse
applicationsReliabilityUbiquitous coverageSeamless indoor/outdoor
operation
Device ChallengesSize, Power, CostMultiple Antennas in
SiliconMultiradio Integration Coexistance
CellularAppsProcessorBTMediaProcessor
GPSWLANWimax
DVB-H
FM/XM77Software-Defined (SD) Radio: Wideband antennas and A/Ds
span BW of desired signalsDSP programmed to process desired signal:
no specialized HW
CellularAppsProcessorBTMediaProcessor
GPSWLANWimax
DVB-H
FM/XMA/DA/DDSPA/DA/DIs this the solution to the device
challenges?Today, this is not cost, size, or power efficient
Compressed sensing may be a solution for sparse signals
8Evolution of Current SystemsWireless systems today3G Cellular:
~200-300 Kbps.WLANs: ~450 Mbps (and growing).Next Generation is in
the works4G Cellular: OFDM/MIMO4G WLANs: Wide open, 3G just being
finalized
Technology Enhancements Hardware: Better batteries. Better
circuits/processors.Link: More bandwidth, more antennas, better
modulation and coding, adaptivity, cognition.Network: better
resource allocation, cooperation, relaying, femtocells.Application:
Soft and adaptive QoS.
9Future GenerationsRateMobility2G3G4G802.11b WLAN2G
CellularOther Tradeoffs: Rate vs. Coverage Rate vs. Delay Rate vs.
Cost Rate vs. EnergyFundamental Design Breakthroughs
Needed802.11n3G10Wimax/4G10-Diminishing returns by beating on the
same areas for optimization-Other network tradeoffs not even
considered-Fundamental breakthroughs both in the way wireless
networks are designed and in the design tradeoffs that are
considered.Multimedia RequirementsVoiceVideoDataDelayPacket
LossBERData RateTraffic
