In this paper, an enhancement design of communication system using optical radio frequency (RF) waves in free space optical communication (FSO) system is presented. To our knowledge, it is the first time that the effect of Gamma-Gamma turbulent channel model on the performance of the proposed system is analyzed and simulated. To obtain an optical communication system with good performance and h...

Vanu Software Radio is a software architecture, implementation, and system design that has been used to implement a variety of waveforms, including voice and data standards for cellular and public safety systems. VSR applies modern software engineering to the high-speed signal processing code of a radio. The goal of the design is to combine software modularity, portability, and rapid developmen...

Using the Velcro approach of including separate silicon for each system can be.Software-based approaches enable engineers to build wireless system radios that are easier to manufacture, more flexible, and more cost-effective. Software.Department of Electrical Engineering. Is the first portable software radio built primarily using. 371, like most modern computers, can boot from almost. Approach ...

Cognitive Radio is a novel method of radio communication which enables more efficient use of the frequency spectrum. This efficiency is achieved by dynamically allocating frequency bands within the spectrum to different users. Within the field of Cognitive Radio, many different aspects of the system must be considered in order to achieve an optimal system. This includes methods for sensing whet...

With the need for mobility and wireless communications now being motivated by the commercial sector, more attention must be given towards IP QOS in the wireless infrastructure, if existing or emerging services are to be commercialized over it. In this work, we investigate and propose a system approach to balance time-varying, space-varying (usage) wireless and mobile channel conditions against ...

The advance of wireless communications brings in various schemes of wireless digital communication technology. Analog communication and broadcasting services convert into digital services in many countries. The IBOC (InBand On-Channel) system has been developed to work in the same band with the conventional analog radio and broadcasting digital signal simultaneously. HDR (HD-Radio) standard of ...

Yuichi Baba Atsushi Hiratsuka Eiji Sasaki Osamu Yamamoto Masakazu Miyamoto OVERVIEW: Railways must operate safely and in accordance with their timetables, and the signalling systems responsible for ensuring safety have been progressively improved in response to demand for greater safety, reliability, and efficiency. Drawing on technology built up through its experience with signals and safety s...