INTRODUCTION In Iowa, the geographic distribution of the population makes telemedicine connections an efficient way to deliver tertiary care services to underserved areas. We established “connections” around the State of Iowa using (1) a courier service, (2) Integrated Services Digital Network-Primary Rate Interface (ISDN-PRI) connections operating at 1.54 Mbps, and (3) DS3 links operating at 4...

1 Abstract1 DQRAP approaches the performance of an idealized M/D/1 queueing system. It provides the theoretical basis for developing practical protocols that can operate in diverse multiaccess channel environments such as LANs, MANs, WANs and satellite networks. In this paper we present DQLAN, a DQRAP based protocol that supports variable length frames in a high-speed LAN environment. The DQLAN...

Context. High-resolution observations of the solar photosphere reveal presence fine structures, in particular so-called Magnetic Bright Points (MBPs), which are small-scale features associated with strong magnetic field regions order kilogauss (kG). It is especially relevant to study these elements, extensively detected all moments during cycle, establish their contribution behavior atmosphere,...

We describe the development of a hardware turbo decoder on a field-programmable gate array for high-speed free-space laser communications. This system will be used by NASA’s Mars Laser Communications Demonstration project on the Mars Telecommunication Orbiter, the first use of high-speed laser communication from deep space. The error-correction code design has been shown to perform within 0.9 d...

Since its conception by Xerox in the mid-1970s and standardization as IEEE 802.3 in 1983, Ethernet has become the de facto standard for computer communication in the business world. Ethernet networks have evolved from coaxial cable-based systems delivering 3-Mbps performance to systems built from unshielded twisted pair (Cat5 UTP) cables that deliver high reliability, low cost, and 100-Mbps per...

This paper describes scheduling algorithms for scheduling traffic in wireless data networks with multiple channels per cell. The paper assumes that a reservation-based MAC protocol is used. The main objective of the scheduling algorithms is to reduce the computation time while maximizing the utilization of the network resources, thereby improving the system throughput. In this paper, we conside...

Multi-type branching processes (MBPs) are stochastic processes modeling populations in which the individuals of a generation produce a random number of children of different types or species in the next generation. Individuals can be elementary particles, genes, animals, or program threads [1,2]. MBPs are classified into subcritical, critical, and supercritical, depending on the spectral radius...

The bi-phase modulation (BPM) for ultra-wide bandwidth (UWB) systems has some advantages over other modulation schemes such as a smoother power spectral density and higher resistance to jitter. In this paper, we estimated the BER performance of the BPM for two different data rates, 10 Mbps and 100 Mbps, in a multipath environment through simulation and compared the results with that for the pul...

Applying a joint code and decoder design methodology, we develop a high-speed (3, k)-regular LDPC code partly parallel decoder architecture, based on which a 9216-bit, rate1/2 (3, 6)-regular LDPC code decoder is implemented on Xilinx FPGA device. When performing maximum 18 iterations for each code block decoding, this partly parallel decoder supports a maximum symbol throughput of 54 Mbps and a...