MSS. intended for publication and books, etc., intended for review should be senit to Professor J. McKeen Cattell, Garrisonon-Hudson, N. Y. RADIO-ACTIVITY AND THE PERIODIC SYSTEM' THE periodic system of the elements has for nearly half a century proved a most puzzling and absorbing problem to chemists. It has been called a law, but while there is undoubtedly an underlying law or laws, I doubt w...

Cognitive radio is an emerging and fascinating technology for the opportunistic use of under-utilized spectrum that promises to change the future technological trends forever if employed properly. This work focuses on the practical implementation of a cognitive radio network.

This paper covers the concept, architecture, development and demonstration of a Smart Antenna Software Radio Test System (SASRATS). SASRATS was designed and developed as a functional and flexible system to facilitate the field testing of space-time processing architectures and algorithms. It also facilitates the correlation between theoretical, simulated and measured performance. The SASRATS ar...

Proposed is a novel space-shape coding scheme with multiple antennas and multiple orthonormal waveforms for UWB-IR systems. Since the proposed coding scheme can be applied for every frame, the spatial diversity can be achieved even without the invariant channel condition over frames. Furthermore, the proposed scheme can provide an additional power gain to enhance BER performance while the FCC s...

Radio Frequency (RF) channels and networks are often used to carry information whose existence may be necessary for organizational operation, or whose content must remain inaccessible to third parties. Cryptographic solutions are commonly employed to render the information on RF links unintelligible to unauthorized recipients, though the existence and nature of the links themselves may assist a...

A software-defined radio consists of a programmable communication system where functional changes can be made by merely updating software. In this paper, a software-defined radio 4-QAM (Quadrature Amplitude Modulation) modem system is implemented in LabVIEW. LabVIEW is a widely used graphical programming environment which allows designing systems in an intuitive block-based manner in shorter ti...

Cognitive radio is considered as one of the main enablers for provisioning dynamic and flexible spectrum/channel allocation in wireless communications. The reliable data transmission over cognitive radio should employ modulation, coding etc. and thus the performance of such a new communication system should be realized. In this paper, we provide the performance analysis of adaptive modulation o...

Recent requirements and evolution of personal communications systems will tend to increase the number of applications that will run over the same hardware/software. While an option is providing this platform with all the algorithms needed, a more suitable one is providing such a platform with the capacity to evolve, along time, from one function to another. Here we present a hardware platform w...