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Physical Layer Algorithm Design and Verification

 

Chair: Zabih (Fary) GHASSEMLOOY

Vice-Chair: Mohammad-Ali KHALIGHI

 

WG2 will explore the fundamental performance bounds of OWC systems, identify the optimum criteria for system design/optimization in light of these, and propose efficient physical (PHY) layer solutions to approach the ultimate performance limits under practical constraints. WG2 will first elaborate an information and communication theoretical framework utilizing the statistical OWC channel models (some of which are already available in the literature and some others to be developed by WG1). This involves the development of mathematical expressions for mutual information, ergodic/outage capacities, diversity-multiplexing trade-off performance and derivation of error rate and outage performance bounds under various channel state assumptions at the transmitter and receiver side assuming different noise regimes (i.e., Gaussian, Poisson, Webb etc.) and turbulence/meteorological conditions (for outdoor applications). Besides being a performance evaluation tool, information and communication theoretic results are invaluable to identify the design space and determine the optimum design criteria for PHY layer techniques to be deployed.

Within the last decade or so, several exciting developments have been witnessed in the area of PHY layer research for wireless communications, most notably the introduction of MIMO communication, cooperative diversity, and novel channel codes along with the proliferation of adaptive transmission and multicarrier communication techniques. Some of these innovative approaches have already been incorporated in international wireless standards and turned into commercial wireless RF products. Such PHY layer methods and techniques have an enormous potential for optimum OWC system design enabling robust and reliable links with higher throughputs, but yet largely unexplored for deployment in optical spectral bands. WG2 will address these issues by developing:


•  MIMO OWC systems to exploit transmit/receive, angular diversities and/or spatial multiplexing gains;
•  Decode-and-forward and amplify-and-forward relay-assisted OWC systems to take advantage of spatial (cooperative) diversity in a distributed manner, e.g., sensor networks in which MIMO deployments are not possible due to space and power constraints;
•  Adaptive OWC transmission schemes in which one or more transmission parameters (such as modulation size, coding type, power, wavelength, beam divergence and shape) are changed based on channel conditions and associated channel sounding/estimation techniques;
• Sophisticated and high-performance channel code families such as turbo codes, low density parity check codes and fountain codes specifically optimized for OWC channels;
•  Single-carrier transmission techniques with judiciously designed time- and frequency-domain equalizers for indoor NLOS infrared/visible light OWC systems to mitigate multipath-induced inter-symbol interference;
•  Multicarrier communication techniques, e.g. orthogonal frequency division multiplexing (OFDM), as an alternative low-complexity robust solution in multipath indoor OWC channels;
•  Hybrid RF/OWC outdoor systems with “soft switching” capability to simultaneously leverage the media and spatial diversities for weather-robust performance in the presence of fog, snow and rain;
•  Sequence detection techniques optimal in maximum-likelihood sense to exploit the received signals’ correlation in time and/or frequency domain for robust detection;
•  Coherent modulation and detection techniques for longer term market needs;
•  "Green" PHY approaches for optimal trade-offs between performance requirements and energy consumption;
•  Novel transmission techniques for all-optical packet and burst switching.


Proposed systems will be extensively evaluated through computer simulations under various channel and noise regimes for the intended application scenarios. The impact of practical issues such as device imperfections (e.g., non-linearities of off-the-shelf transmitter/receivers, receiver sensitivity, beam divergence, etc.) and environmental conditions (e.g., building sway, alignment problems, adverse weather conditions in outdoor systems) on system performance will be carefully investigated. Given the availability of experimental test-beds and advanced measurement equipment at the participating institutions, OPTICWISE will further have the opportunity to implement the proposed PHY algorithms and methods and test them under real-life conditions for validation purposes.

 

Announcements

 

1. OPTICWISE becomes an Associate Member of the 5G PPP.

 

2. OPTICWISE participates in the preparation of new IEEE standart on OWC.

 

3. IWOW 2014 Workshop Proceedings are now available at IEEExplore! All papers can be accessed through this link.

 

4. OPTICWISE Chair to Give Keynote Speech at BlackSeaCom Conference.

 

5. IWOW 2013 Workshop Proceedings are now available at IEEExplore! All papers can be accessed through this link.


6. COST IC1101 OPTICWISE Action World Record: A FSO link at 1.6 Tbit/s (see more details on SPIE Vol 52, Issue 11, Nov 2013). 

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