Radio propagation simulation tools are important for prediction and verification of the radio signal coverage by individual transmitters or transmitter networks such as mobile phone cellular networks. In the case of a large geographic area with a relative high resolution, the simulation can become computationally demanding, taking a considerable amount of time to accomplish. Parallel processing...

Nowadays, cognitive radio is one of the most promising paradigms in the arena of wireless communications, as it aims at the proficient use of radio resources. Proper utilization of the radio spectrum requires dynamic spectrum accessing. To this end, spectrum sensing is undoubtedly necessary. In this chapter, various approaches for dynamic spectrum access scheme are presented, together with a su...

In this paper, fast and reliable identification of radio transmitters based on an analysis of their turn-on transients is presented. Since the transients are unique, they are called the fingerprints of the corresponding radio transmitters. Major tasks in a radio transmitter identification system are: (i) separating a transient from the channel noise, (ii) extracting important features contained...

Measurements of 82 Hz radio signals from a Russian ELF transmitter located on the Kola Peninsula are described. The measurements were made at several locations around the world, including Dunedin, New Zealand, and Arrival Heights, Antarctica, which are close to the antipodal point for the transmitter. This is the first time man-made ELF signals have been observed over such long distances and th...

This paper examines power–controlled modulation schemes for fixed–rate transmission over fading radio channels. We are primarily interested in transmitter diversity schemes for multiple–block (slot) transmission on narrowband time–division duplex systems such as DECT and PHS. We consider transmitter power control over one and two independently–faded blocks using variable (coded) modulation sche...

Transmitter diversity at the base station of a cellular mobile radio system provides a means to achieve performance gains similar to those obtained with mobilestation receiver diversity, but without the complexity of a mobile-station receiver antenna array. We investigate Selective Transmit Diversity (STD) in the downlink of the Wideband Code Division Multiple Access (WCDMA) mobile radio channe...

This paper presents development of passive channel sounder using software defined radio based receivers and commercial transmitter operating in cellular network. Accuracy developed is verified by over-the-air path gain measurement outdoor open space. For evaluation, line-of-sight estimated correlation method compared with theoretical gain.