Marek Novak

Experimental measurement of the atmospheric turbulence effects and their influence on performance of fully photonic wireless communication receiver

Abstract The new generation of Free-Space Optical systems utilizes photonic components used in optical fiber communications which demand high precision and complexity of the system. We present an analysis of the laser beam propagation in the context of fully photonic free space optical links. The experimental data is presented and used for the estimation of single-mode (SM) fiber coupling loss.

Characteristics of SPI drivers in RTOS environment

The article describes different types of SPI (Serial Peripheral Interface) drivers in RTOS (Real-Time Operating System) environment. Each driver can be appraised from various perspectives e.g. throughput, CPU usage, etc. which result in different characteristics. The advantage of dissimilarities can be used to effectively satisfy software application requirements. The article presents drivers from throughput and idle time points of view. Analysis and data is related with PK22FN512 microcontroller and FreeRTOS.

On real time VLC channel emulators

This extended abstract proposes an FPGA-based concept for real time channel emulation (CE) adapted for visible light communication (VLC) applications. Crucial insights into the optical channel modeling techniques as well as the important blocks of CE are described. Furthermore, the paper details the CE operation principle enhanced with the necessary mathematical background. Finally, the paper outlines a hardware implementation.

Retroreflective optical communication

This article deals with visible light communication (VLC) based on retroreflective principle. Visible light communication presents great potential in terms of possible communication bandwidth, transmittter localization, spectral, power and spatial effectivity and more. In the article, the retroreflective communication itself is introduced and compared to common VLC and RFID systems. Essential parts of power balance are mentioned and discussed. The last part of the article discusses benefits of retroreflective communication for Internet of Things.

Visible light communication beacon system for internet of things

The article describes an application of VLC (Visible Light Communication) for IoT (Internet of Things) nodes authentication and metadata exchange in the field of augmented reality. A practical use-case of presented communication system is provided and benefits of using such technique are explained. A smartphone camera based platform and advanced image processing is used for data reception and as a proof of concept implementation of presented communication technique. The future direction of the research is provided.

LwIP based network solution for MicroBlaze

This article deals with interfacing of Xilinx MicroBlaze (UB) softcore microprocessor to full duplex, 1 Gb/s media converter from metallic to optical interface, which is employed in experimental FSO link as a transceiver. The MicroBlaze harvests statistical data from the link and allows administration of the link via interactive web user interface. The MicroBlaze is connected to the data bus of the media converter via custom simple Ethernet switch and custom network interface. The porting of lightweight IP stack and implementation of example HTTP server is mentioned. The whole design is implemented on Xilinx XUPV5-LX110T Evaluation Platform with Virtex-5 FPGA chip.

Improvement of bit error rate in free space optical link

The article describes an innovative bit error rate reduction technique principle and its practical implementation. The design of the technique is implemented in an FPGA and is combined with other more conventional BER reduction techniques, such as Reed-Solomon coding. Experimental results are provided. The application bit rate in function of BER for both reliable (TCP) and unreliable (UDP) mode of transport is presented. The end-to-end delay of the designed transceiver is also experimentally verified and analysed.