The trend of inter-connection among a multitude of different wireless access networks presents the great and bright potential business opportunities for communication operators. However, such a trend also creates a huge challenge for the network designers to manage the different radio access technologies in a cooperative mode. Therefore, this paper proposes two advanced functional architectures...

Radio fingerprinting is the process which identifies a cellular phone / other radio transmitter by the unique "fingerprint" which characterizes the signal transmission. Location fingerprinting determines receiver position with the help of database of RSS measurements from different sources .Location fingerprinting a positioning method that explores existing infrastructures e.g. cellular network...

In a radio-wave shield, a method of blocking radio waves in which a space is surrounded by a high loss dielectric material, some waves leak through the long and slender gap between the walls. We analyzed the losses in the gap section and in the gap aperture. The former was analyzed by using an equivalent parallel board transmission line, the latter by using an aperture field method. Here we des...

|In mobile radio communications, for a given system bandwidth the number of supported mobile terminals and the o ered data rates per mobile terminal should be maximized. The enhancement of the air interfaces plays an important role when pursuing this goal. In the paper various possibilities of air interface enhancements suited for 3G and beyond-3G mobile radio systems are discussed. The conside...

The convolutional interleaver technique is used in telecommunication applications such as SDH and PDH radio systems, GSM and UMTS mobile communication systems, and point-tomultipoint radio systems to protect transmission channels from noise. On the transmit side, the convolutional interleaver parallelizes serial input data into N-bit words and shifts the data word through N delay lines. The del...

A large portion of radio energy in smartphones is wasted during a special waiting period, known as the tail time, after a transmission is completed. In order to save the wasted energy during the tail time, it is important to accurately predict whether a subsequent transmission will occur in the tail period. In this paper, we propose a novel general-purpose predictive dormancy technique, called ...

In a tactical field, wireless communication is prevailed among military agents and vehicles, but it is fragile by jamming attack from an adversary because of the wireless shared medium. Jamming attack is easily achieved by emitting continuous radio signal and it can interfere with other radio communications within the network. Channel switching over multiple channels or route detouring have bee...

The cognitive radio network (CRN) is a promising solution to the problem of spectrum scarcity. To achieve efficient spectrum utilization, cognitive radio requires a robust spectrum sensing and spectrum sharing scheme. Therefore, spectrum sharing scheme plays a key role in achieving the optimal utilization of the available spectrum. The spectrum sharing in CRN is more challenging than traditiona...

Introduction Recent progress in transmission capacity of dense wavelength-division multiplexed (DWDM) signals in a trunk optical fiber line now allows transmission of data beyond 10 Tbit/s over more than 100 km [1], [2]. The DWDM technology has to be applied to future millimeter-wave fiber-radio systems in order to take the capability to deal with the large amount of data capacity. There have b...

Visible Light Communication (VLC) is an embryonic form of wireless communication. Visible light communication uses light waves instead of radio waves for data transmission. Visible light communication provides higher capacity, greater efficiency, better security and availability than radio frequency communication. Light Emitting diodes (LEDs) are used as transmitters as they are more cost effec...