This paper concerns power allocation in relay-assisted wireless channels for two-hop transmission. First, the transmitter sends the information to both the relay and receiver parts. Next, in the second hop, the transmitter cooperates with the relay to increase the received signal to noise ratio (SNR), assuming the relay makes use of the Amplify and Forward (AF) strategy. Moreover, it is assumed...

— Providing space diversity at mobile devices such as handsets, personal digital assistants (PDA), etc is costly and problematic, due to their strict space limitation. Recent studies, however, have revealed that extraordinary diversity gain, which results in the remarkable bene ts of an increased achievable transmission code-rate and a reduced information outage probability, can be obtained fro...

Nano-electro-mechanical(NEM) relay technology has been proposed efficiently for ultra-lowpower digital integrated circuit applications [1], [2]. This is because the relay is an ideal switch, and that it exhibits abrupt on/off switching behavior and zero offstate leakage current (IOFF), so that its operating voltage (VDD) can be reduced to be close to zero, in principle. Hence, NEM relay technol...

The decision of digital distance relay is very important for making the protection scheme in the transmission system more reliable. As the current signal is taken from the output of the current transformer, the distortion introduced by the saturation in it affects the performance of the distance relay. In this context proper nonlinear modeling of current transformer is necessary and a suitable ...

The modern power system is equipped with protection based on advanced technology through the use of digital multifunction relay, control and intelligent selectivity, whose purpose to ensure maximum security service continuity relay in presence various fault currents. Distance an important required high voltage transmission lines. In this paper, experimental platform tests have been performed pr...

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An optimal algorithm is presented for tracking the phase of a slowly modulating signal by means of digital sampling of its sign. Error bounds and a numerical illustration are given.

The reliable operation of protection systems depends on the correct setting of protective devices. Due to the increasing network complexity and the large number of protective devices (and their associated setting parameters), it is extremely laborious for engineers to manually validate the settings. Existing model-based (MB) systems that are capable of performing the validation task require sig...