L. Smoczynski

Bio: L. Smoczynski is an academic researcher. The author has contributed to research in topics: Mobile broadband & The Internet. The author has an hindex of 1, co-authored 2 publications receiving 16 citations.

A comparison of different radio over fibre system concepts with regard to applications in mobile Internet and multimedia

Abstract: The paper presents a comparison of different radio over fibre system concepts with regard to applications in broadband services transmission. Several concepts of radio over fibre systems have been studied around the world, and each of them seems to be very attractive because of low loss and extremely wide bandwidth necessary for mobile broadband services. Commercial deployment of the millimeter-wave optical links for future mobile broadband services depends on the expected full costs of the systems. The paper discusses an impact of development of new technologies on possibility of commercial deployment of the systems.

COST Action 273 at the National Institute of Telecommunications

Abstract: The COST Action 273, "Towards Mobile Broadband Multimedia Networks", is a framework of research efforts at the European level in the mobile broadband area. The paper overviews topics in the framework of the action proposed for investigation in joint research at the National Institute of Telecommunications in Warsaw and the University of Modena and Reggio Emilia.

Standard Propagation Channel Models for MIMO Communication Systems

Abstract: The field of wireless communication networks has witnessed a dramatic change over the last decade due to sophisticated technologies deployed to satisfy various demands peculiar to different data-intensive wireless applications. Consequently, this has led to the aggressive use of the available propagation channels to fulfill the minimum quality of service (QoS) requirement. A major barometer used to gauge the performance of a wireless communication system is the spectral efficiency (SE) of its communication channels. A key technology used to improve SE substantially is the multiple input multiple output (MIMO) technique. This article presents a detailed survey of MIMO channel models in wireless communication systems. First, we present the general MIMO channel model and identified three major MIMO channel models, viz., the physical, analytical, and standardized models. The physical models describe the MIMO channel using physical parameters. The analytical models show the statistical features of the MIMO channel with respect to the measured data. The standardized models provide a unified framework for modern radio propagation architecture, advanced signal processing, and cutting-edge multiple access techniques. Additionally, we examined the strengths and limitations of the existing channel models and discussed model design, development, parameterization, implementation, and validation. Finally, we present the recent 3GPP-based 3D channel model, the transitioning from 2D to 3D channel modeling, discuss open issues, and highlight vital lessons learned for future research exploration in MIMO communication systems.

RoF Networks : A comprehensive study

Abstract: We present a comparative study of different Fiber-Wireless networks with regards to their applications, architecture, hardware complexity, development costs, offered services and allocated bandwidths. While spectral resources and high data-rates are incessantly requested, these radio over fiber (RoF) networks have been proposed to overcome limitation in bandwidth. They take advantage of the spectral potential of millimeter-waves bands. Due to their flexibility, RoF links may be designed for a transparent transport of analog or digital signals. Several applications, based on point to point or point to multi points links, are here reviewed. Trends and prospects for these networks are also explored.

Optical Generation of Modulated Millimeter Waves Based on a Gain-Switched Laser

Abstract: We propose and demonstrate two configurations for optical millimeter-wave (mm-wave) generation and transmission of 3-Gb/s downstream data based on a gain-switched laser (GSL). The first configuration generates an optical comb spectrum from a GSL that can be appropriately filtered to generate two optical sidebands with 60-GHz separation. These sidebands are modulated with baseband data by using an external intensity modulator and then transmitted via optical fiber to the remote antenna unit (RAU). The second configuration produces a modulated optical frequency comb by driving the laser with both RF local oscillator and data streams coupled together and then followed by the same optical filters to generate two modulated optical sidebands. At the RAU, these two sidebands are heterodyned using a photodetector to generate the electrical modulated mm-wave signal. We investigate the distribution of these two methods over 3-km fiber with 2-m wireless link and demonstrate the system simplicity and cost efficiency for mm-wave over fiber systems. Both configurations are simulated to verify our obtained results and show system performance at higher bit rates.

Towards broadband global optical and wireless networking

Abstract: We present a novel non-conventional approach to the future optical and wireless hybrid transport network that is capable of supporting the dominating kinds of traffic, i.e., voice/real-time, wireless and packet traffic, in a single transport network. The proposed model combines different technologies as connection and connectionless networks, optical cable and wireless (microwave/millimetre wave or optical wireless) and it is suitable for a variety of purposes and services in order to achieve global broadband networking features. Our new networking model contains an extension to the wireless world in order to achieve mobility and personalisation of the connection. It consists of an upgrade of real-time traffic with a microwave modulated optical wave, in order to carry out conventional mobile wireless via optical fibres though long distances and without a significant distortion. The whole available bandwidth can be fully exploited in the hybrid network. In the IP part of the network, quality of service can be differentiated for various classes of packets and network reliability/survivability can be categorised for the whole hybrid network. This substitutes the complete and revolutionary shifting to packet traffic, that many promote, with smooth evolutionary upgrades.

Towards broadband global optical and wireless networking

Abstract: We present a novel non-conventional approach to the future optical and wireless hybrid transport network that is capable of supporting the dominating kinds of traffic, i.e., voice/real-time, wireless and packet traffic, in a single transport network. The proposed model combines different technologies as connection and connectionless networks, optical cable and wireless (microwave/millimetre wave or optical wireless) and it is suitable for a variety of purposes and services in order to achieve global broadband networking features. Our new networking model contains an extension to the wireless world in order to achieve mobility and personalisation of the connection. It consists of an upgrade of real-time traffic with a microwave modulated optical wave, in order to carry out conventional mobile wireless via optical fibres though long distances and without a significant distortion. The whole available bandwidth can be fully exploited in the hybrid network. In the IP part of the network, quality of service can be differentiated for various classes of packets and network reliability/survivability can be categorised for the whole hybrid network. This substitutes the complete and revolutionary shifting to packet traffic, that many promote, with smooth evolutionary upgrades.