-------------------------------------------------------------------ABSTRACT-----------------------------------------------------------------In the present paper, we have proposed Radio over fiber (ROF) technology which allows radio frequency (RF) transmission directly over the optical fiber has attracted much attention due to its promising performance and operational cost reduction. The well kn...

I n 1963, the IEEE awarded its Medal of Honor to George C. Southworth (Fig. 1). He was cited for ‘‘his pioneering contributions to microwave radio physics, to radio astronomy, and to waveguide transmission.’’ He spent most of his professional career with the American Telephone and Telegraph Company (AT&T). His experiments with waveguide transmission during the 1930s helped lay the foundation fo...

Cognitive radio is an intelligent radio that can be programmed and configured dynamically to fully use the frequency resources that are not used by licensed users. It defines the radio devices that are capable of learning and adapting to their transmission to the external radio environment, which means it has some kind of intelligence for monitoring the radio environment, learning the environme...

Radio receiver, as an extensively feasible modern technology, has been widely applied in all fields of military and civil. It is mainly to demodulate all kinds of required signals with strong interference and noise. Based on intermediate frequency (IF) software radio receiver test platform, the data transmission approach combining direct memory access (DMA) and multichannel buffered serial port...

Spectrum handover is a significant topic in the cognitive radio networks to assure an efficient data transmission in the cognitive radio user’s communications. This paper proposes a comparison between three spectrum handover models: VIKOR, SAW and MEW. Four evaluation metrics are used. These metrics are, accumulative average of failed handover, accumulative average of handover performed, accumu...

Reliable detection of other radio systems is crucial for systems that share the same frequency band. In wireless communication channels, there is uncertainty in the received signal level due to multipath fading and shadowing. Cooperative sensing techniques in which radio stations share their sensing information can improve the detection probability of other systems. In this paper, a new coopera...

Besides amateur-radio satellites, the most interesting satellites for radio amateurs are weather (imaging) satellites: radio amateurs have successfully built weather-satellite image reception equipment for all known weather satellites and all known image transmission standards. Radioamateurs also pioneered satellite TV reception using small antennas much earlier than this became a mass-produced...

Performance evaluation of ultra-wide band radio signals based on multi-band (MB) orthogonal frequency division multiplexing (OFDM) system is presented. These systems are very attractive due to their capability to deliver high-speed data streams, their co-existence with the current radio standards and their suitability for transmission in fibre. In this paper, the work is focused on the simulati...

On-demand wake-up approaches typically require two channels: a data channel and a wake-up channel for waking nodes when needed. This allows for the immediate transmission of a signal on the wake-up channel, if a packet transmission is needed on the data channel. Thus, the wake-up latency can be reduced. The drawback is the additional cost for the second radio. In [2], Gu and Stankovic present a...