Dynamic resource allocation based on the current channel state is a promising strategy to increase the capacity of wireless links. In this paper, the optimum accessing and resource allocation scheme for fading multiple–access channels with partial CSI at the transmitters are found. Partial knowledge of the fading states is a reasonable assumption for systems which provide a low rate feedback ch...

As mobile and wearable technology has evolved, an increasing need for indoor positioning has arisen. In particular, the use of ultrasonics provides a cheap way to fulfil this need. However, current ultrasonic location systems have to be calibrated manually by providing information about the exact positions of the transmitters used. Where systems are to be deployed over a large number of rooms i...

Long-term records of nesting numbers, or proxies to nesting numbers, show a precipitous decline in the size of many sea turtle populations. Population declines are most frequently attributed to fisheries bycatch, although direct quantification of this level of mortality is rare. We used satellite-tracking records for turtles in the Mediterranean Sea and Pacific, Atlantic and Indian Oceans to id...

identifying the chain of transmitters mentioned in the sanads for the verification of the sanad is necessary for employment of ḥadīth. one of the problems observed in the chains of transmission is the repetition of the names applicable to two or more transmitters. on the other hands, some transmitters have been referred to by various names and titles in chains of transmission; various titles th...

We present a prototype system for a simple version of electro-magnetic wave propagation prediction in rural areas, using a real-time exploration environment for very large topographic scenes. The wave propagation prediction algorithm is based on a simple line-of-sight approach, realized with a modified hidden surface removal algorithm. The system serves as a transmitter management tool, for int...

Types of Modulation. Figure 7.1 illustrates two alternative ways to generate a modulated optical signal. In Fig. 7.1 (a), the laser is turned on and off by modulating its current; this method is known as direct modulation. In Fig. 7.l(b), the laser is on at all times, a so-called continuous wave (CW) laser, and the light beam is modulated with a kind of optoelectronic shutter, a so-called modul...

1. The integrative behavior of lamprey central neurons was analyzed by white noise frequency domain methods and simulated with a minimal, non-linear neuronal model consisting of two voltage-dependent processes: (i) a depolarizing inwardly directed conductance carrying calcium and monovalent ions and (ii) a repolarizing outwardly directly conductance representing a generalized potassium conducta...