To solve the shortage defects of wireless spectrum source of Internet of things, an idle spectrum resources and immune sorting selection method based on the subjective and objective weight is proposed by using cognitive radio network technology. Firstly, the radio cognitive idle spectrum system is relied on to make the spectrum system modeling of Internet of things for the generation of objecti...

The recent growth in personal multimedia communication devices being used for image transmission, have poised a challenge to protect such data against loss over mobile radio channels. This paper investigates several error protection schemes for robust transmission of JPEG2000 compressed imagery over mobile radio channels affected by various amounts of fading degradation. The nature of JPEG2000 ...

Live network tests are often used to obtain performance metrics associated with the transmission of data using TCP and UDP over packet radio networks. However, only individuals who hold an amateur radio license issued by the United States Federal Communications Commission, as specified by Title 47, Code of Federal Regulations, Part 97, are permitted to operate an amateur station. For this reaso...

This paper introduce the concept of cognitive UWB radio, a wireless system based on UWB transmission able to self adapt to the characteristics of the surrounding environment. UWB is an promising underlying method for coexistence among different systems. However, the performance may not be as good as expected due to the changing spectrum environment. Thus, cognitive UWB radio is proposed by taki...

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...

In future mobile radio systems, interference cancellation is a very challenging issue. The decentralized iterative joint detection (JD) / joint transmission (JT) signal processing considering only partial channel state information (CSI) for intercell interference cancellation is a promising candidate for future time division duplex (TDD) based orthogonal frequency division multiplexing (OFDM) m...

Australia is contributing to the next generation radio telescope, the Square Kilometre Array (SKA), which will have a collecting area of one million square metres. The SKA will be a digital radio telescope that will rely on high-speed data communications for routine global electronic transmission of VLBI data and some traditional analog stages will be replaced by software-defined blocks on fast...

Not so long ago, specific services and the associated networks were closely intertwined. Telecommunications networks delivered voice telephony. Broadcast systems delivered radio and television. The introduction of cable television and satellite transmission resulted in only a marginal increase in complexity. Today, one can no longer say that the service and the network are inextricably intertwi...

This article proposes a hybrid algorithm for spectrum allocation in cognitive radio networks based on the algorithms Analytical Hierarchical Process (AHP) and Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) to improve the performance of the spectrum mobility of secondary users in cognitive radio networks. To calculate the level of performance of the proposed algorithm...