Current and Future Research in Wireless Networks and Communications

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Current and Future Research in Wireless Networks
and Communications

• Co-Directors Professor J. Cosmas H. Al
  Raweshidy
• Members Dr M. Hadjinicolaou, Dr R. Nilavalan, Dr
  Q, Ni, Dr J. Loo, Dr K. Banitsas

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Aims of Wireless Networks and Communications
Centre Centre

• Carry out international quality research to
  obtain international excellence in the following
  research areas
• Wireless Communication Networks
• Broadcast Communication Networks
• Mobile Communication Networks
• Radio over Fibre
• Future Internet
• Application of Networks
• Meet the research needs of industry and society
  thereby contributing to the economic
  competitiveness of the United Kingdom and the
  quality of life.
• Make available our research output for
  commercialisation by providing Research Output
  Products for Commercialisation.

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Radio Network Performance Prediction and
Measurement
Brunel University Broadcast Provisioning System
Improved Reception in Brunel Coverage Area for
MIMO Transmissions
Brunel University MIMO/SISO Transmitters

LoS Performance Measurements in coverage area
Lab Measurement Campaign to ascertain Improved
Reception performance compared to single antenna
transmissions
Diversity Measurements with DVB-H Receivers
Errored Seconds Ratio 5 (ESR5) for different
values of Received Signal Strength Indication
(RSSI)
Lab Measurement Campaign to ascertain Improved
Reception performance for MIMO with speed of
mobile
Diversity Measurements with DVB-T Receivers
Drive Tests in Coverage Area
Prof. Cosmas
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Radio Network Service Provisioning
Mobile TV
On-Demand Magazines
On-Demand Video
Telco Portal
Alerts
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CoreNetwork
Commerce ManagementSub-system
Cellular RAN



ServiceCreationSub-system
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ContentCreationSub-system
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DVB-H RAN
Core Network
ServiceManagementSub-system
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RAN ManagementSub-system
Network QoS ManagementSub-system
Prof. Cosmas
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RF - MEMS

• Development of novel Radio Frequency Micro
  Electro Mechanical Switches (RF MEMS) for the
  future
• Applications
• Reconfigurable Antennas
• For cognitive communication systems
• Frequency Switching
• Beam steering
• Tunable Filters
• Design
• Very low insertion loss in the ON condition.
• Very high isolation in the OFF condition.
• Good linearity over a wide frequency range.

The RF MEMS DESIGN
Dr. Nilavalan
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Antennas and Propagation

• Development of novel Antenna structures for
  future applications
• Multi-band Antennas
• Reconfigurable Antennas
• Flexible Conformal Wideband Antennas
• Applications
• Cognitive communication systems
• Supports Dynamic Spectrum allocations
• RFID Systems
• Medical Applications
• Design
• Electromagnetic Simulation Software

Novel Antenna Designs
Dr. Nilavalan
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Electromagnetic Simulation

• Development of Electromagnetic Simulation Tools
• Finite Difference Time Domain (FDTD) methods
• Orthogonal
• Non-orthogonal
• Applications
• Analysis of complex Electromagnetic problems
• Microwave Systems
• THz Systems
• Optical Systems

FDTD Unit Cell
Time and Frequency Domain Analysis
The FDTD Software
Dr. Nilavalan
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Wavelet Video Codec - Dirac

• Dirac is a general purpose open-source wavelet
  video codec. It was developed by BBC and named
  after British Physicist Paul Dirac.
• Funded by BBC for the research and developments
  of optimum video compression techniques for
  Dirac.
• New techniques developed for Dirac include
• Fast and efficient semi-hierachical motion
  estimation
• Quality-factor based rate control
• Robust transmission and error control
• Research outcome showed that the compression
  performance achieved by Dirac is very close to
  the H.264 and in some instances even outperform
  H.264.
• Dirac can be seen as a competitive alternative to
  the H.264 video coding standard.

Diracs motion estimation strategy is more
efficient than H.264.
Motion Estimation
Diracs rate control is more accurately than
H.264.
Rate Control
Dr. Loo
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Distributed Video Coding

• Distributed video coding is a new paradigm for
  video compression which enables low-complexity
  video encoding where the bulk of the computation
  is shifted to the decoder.
• Suitable for uplink mobile video communication
  and wireless video sensor node.
• Funded by ESPRC ORS award
• This work has developed efficient DVC
  architectures and algorithms which include
• Optimisation of decoding efficiency with suitable
  macroblock size, side information interpolation
  and refinement techniques, and decoding feedback
  process.
• 3D DCT transformation techniques to exploit the
  temporal redundancy reduction at the encoder.
• Design of DVC architecture for multiview video
  coding.
• Design of DVC architecture for robust
  transmission of wavelet compressed video over
  Internet with bandwidth efficiency.

Multiview video coding with 3D Transform DVC
Our algorithm outperform H.263 Intraframe coding
R-D performance of the proposed 3D transform
domain for multiview video coding
Dr. Loo
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• Cross-layer design optimisation for OFDMA
  based broadband wireless systems (EPSRC
  Industrial CASE Project in collaboration with
  Motorola)
• Design of novel cross-layer scheduling framework
  
• No requirement of perfect Channel State
  Information (CSI)
• Solution of joint optimal subcarrier and power
  allocation
• Support of heterogeneous QoS requirements
• Applicable to both 3G LTE and WiMAX

Our System Design
Simulation Results
Dr. Ni
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• Design optimisation for IEEE 802.11e/n/p
  Next-Generation Wireless LAN
• Adaptive MAC tuning mechanisms for IEEE 802.11e
• Novel MAC/PHY layer design (aggregation,
  MIMO/OFDM) for IEEE 802.11n high throughput
• Cross-layer design and location-based
  optimization for vehicular and mobile networks
• Adaptive VoIP/video over IEEE 802.11e/n/p
  single-hop and mesh networks

Our Simulation Results on Improvement for IEEE
802.11n
Our Simulation Results on Improvement for IEEE
802.11e/b
Dr. Ni
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An Emergency TeleOrthoPaedics m-health System for
Wireless Communication Links

Comparison of SMPT and FTP protocols over GSM and
GPRS
Downloading speeds for vatying file size using
FTP over GPRS and UMTS
Sample of X-ray images transmitted (X-rays 11D
17D of Table 1)
Repeated downloading of a 450 Kbytes video clip
over a period of 20 hours using FTP over GPRS
Downloading timing for files of varying size
using FTP over GPRS and UMTS
Dr. Hadjinicolaou
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Spatial Data Stream Multiplexing Scheme for High
Throughput WLANs
Transmitter MIMO-OFDM PHY layer model with SDSM.
Receiver MIMO-OFDM PHY layer model with SDSD
Throughput simulation results under Rayleigh flat
fading channel.
BER simulation results under Rayleigh flat fading
channel
Dr. Hadjinicolaou
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Mobile consultant Combining total mobility with
constant access An integrated system that will
allow a medical consultant to freely move either
within, or outside the hospital, while still
maintaining constant contact with the patients
via videoconferencing and high-resolution imaging

• Benefits
• Wireless videoconferencing
• High resolution imaging (includes DICOM)
• Constant access
• No cost inside hospital / minimal cost outside
  hospital
• Can be used as pager
• Can be used as an IPphone
• Uses 3G cells to maintain connection outside the
  hospital
• Small cost to acquire / operate
• Lightweight to carry / easy and safe to use

Dr. Banitsas
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Assist 4 Living Offering sustainable,
inexpensive, easy to use and reliable health
care Brunel University / Industrial partner
Non invasive sensors Bluetooth / zigbee Sensors
to sense falling / emergency Continuous
monitoring can detect and improve chronic
conditions Elderly people would benefit
Home network to support freedom of movement Group
of supporters to assist the patient Completely
mobile (BT or Zigbee to transmit to Home
Network) Can freely roam outside the house
Dr. Banitsas
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Future Research

• Future Wireless and Wireline Internet
• Cooperative Radio Network resource management
  Systems and Protocols for broadcast/cellular
  systems
• Novel intelligent design of radio resource
  management for multi-cell LTE/WiMAX systems
• Transmission of new kinds of media (e.g. 3D,
  scalable video) over different type of wireless
  and wireline networks
• Measurement of performance of heterogeneous
  wireless networks
• Cross layer optimisation for OFDM systems using
  game theory
• Error resilience of new kinds of media
• Cognitive and Green Communications
• Development of fully re-configurable antennas
• Development System modelling tools for THz
  systems

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