Skip to main content

ComSysLab

The ComSysLab is home to research in Photonic Systems, Optical Technology, Wireless Communications, Machine Learning and Nanoscale Communications. The fundamental advances in the laboratory will produce impact in areas such as next generation mobile data networks, vehicular communications and future healthcare monitoring systems.

Optical Wireless

The ComSysLab is one of the UK’s leading centres for optical wireless communications; the transmission of information in free space using an optical carrier. Optical wireless is attractive because it offers very broad bandwidths with no spectrum congestion (or charges) and does not suffer from RF interference. In order to advance the technology, new optical receiver-detector devices are being investigated, especially the photoparametric amplifier, which combines advantageously optical detection with parametric amplification. In addition, diffuse optical distribution systems are being developed, in order that users can operate anywhere within a building environment, and be offered a consistent quality of service.

Molecular Communications

In recent years there has been rapid progress in the development of nanoscale devices, commonly grouped under the heading of nanotechnology. The impact of this area arises through the use of very small devices (at the nanometre scale) to perform socially useful tasks ranging from bespoke medical treatments to monitoring the state of painted surfaces. The interconnection of nanoscale devices in an emerging area in which there are still relatively few published results. It is essential that nano-machines are able to communicate to enable them to realise their potential via nanonetworks, and this forms the basis for ongoing study. Mark Leeson organised a special session on Nanoscale Communications and Technology at the CSNDSP 2014 conference in Manchester, UK.

Optical Access Networks

A further strand concerns optical receiver analysis, in particular with respect to the use of optical preamplifiers. To operate a system including an optical preamplifier it is necessary to reduce the amplified spontaneous emission (ASE) noise by use of a filter. Work in the group has focussed on bit error rate analyses including realistic filter characteristics and pulse shapes.

Optical Network Security

All-optical networks (AONs) are a relatively new technology for high data-rate communications. They contain only optical components and are intrinsically different from optical networks currently being used. More specifically, AONs provide transparent features that allow routing and data switching without necessitating the interpretation or regression of signals within the network.

Consequently, AON components and architectures bring forth a set of new challenges in network security. Novel approaches to the detection of attacks against all optical networks have been investigated with considerable success.

Network Coding

The idea that nodes in a communication network can do more than just forward the traffic that they see has become established in what is known as Network Coding (NC) which improves throughput in multi-hop wireless networks. Current work is focused on evaluating the effects of adopting NC in data link control where flow control error protocols are employed. Specifically, Automatic Repeat reQuest (ARQ) techniques in conjunction with NC are being studied through extensive simulation.

Cognitive Radio

The wireless spectrum in increasingly congested and cognitive radio uses software to provide opportunistic access to the licensed spectrum bands. By sensing the licensed frequency spectrum and identifying vacant channels, it is possible to allow secondary users access to idle channel. Primary users should not suffer service degradation from opportunistic spectrum access and it is the job of the secondary user to manage interference by spectrum sensing. Current work includes the extension of collaborative spectrum sensing to multiple primary user scenarios and different primary user traffic distributions.

International links

australia-flag-icon.pngcanada-flag-icon.pngchina-flag-icon.pngeuropean-union-flag-icon.pngiran-flag-icon.pngmalaysia-flag-icon.pngtunisia-flag-icon.png

The ComSysLab has created strong links with overseas facilities and personnel.

 

comsyslab.jpg 

People

Head of Laboratory

Academic Members

Visiting Academic

  • Dr M I Majid Flag of Pakistan

Current PhD Students

  • B Shao - Delay Tolerant Networking
  • N. Gunes - Stochastic Resonance in Communication Systems
  • Y Li (Visiting) - Coherent Communications for Underwater Optical Transmission
  • Z. Rong - Nanoscale THz communications
  • Y Zhou - Pilot-based energy harvesting
  • L Zhang - Smart Homes

Recent PhD Students

WWRF 1

Mobile VCE

COST

Infrared