When a file is loaded into a direct access storage device using key-to-address transformations, the number and size of storage blocks can be selected. In this study, a selection that minimizes the combined cost of storage space and accesses to the storage device is determined for the case where no record additions or deletions occur after loading. The analysis is based on the assumption that fo...

In this paper interleaver design for bit-interleaved coded modulation and systems with channel-state information at the transmitter is investigated. Based on the bit level capacities of an equivalent channel model an advantageous interleaver design is proposed. Understanding the varying level capacities as the result of a “fading” process, suited bit metric arrangements in the decoder can signi...

The jointly optimum noncoherent multiuser detector is obtained for nonlinear nonorthogonal modulation over the frequency nonselective Rayleigh-fading multiple-access channel. Upper and lower bounds on average bit-error probability are derived. While these bounds are numerically computable, they are too complicated to give insight into the relative influence of system parameters on the essential...

A LECCS-I/O model of a multi-bit drive IC was devised for reducing electromagnetic interference. An equivalent power circuit model of the IC (74LVC04) was derived from measured power impedances by measuring four test boards. Each board consisted of a single layer, a powerimpedance measurement port, and two output ports from the six IC drivers. The power impedance was measured for various combin...

In recent years, use of biodegradable polymers based nanoparticles has received highinterest in the development of vaccines delivery vehicles. The aim of study was to preparechitosan nanoparticles (CS NPs) for loading Echis carinatus (EC) venom and evaluate theirpotential as an adjuvant and antigen delivery system on a pilot scale. CS NPs were preparedusing ionic gelation method, and their char...

This paper analyzes the bit-error rate performance of a dual transmission-multiple reception antenna system in conjunction with a rotated trellis-coded modulation scheme over Nakagami fading channels. A simple way to combine the exact calculation of the pairwise error event probability with the transfer function bounding techniques is described. This approach allows us to evaluate an extremely ...

Subarray configuration is not a trivial problem in array signal processing. A proper subarray configuration is important to improve the detectability of an array. A new searching algorithm, which is based on Genetic Algorithms (GA), for the optimum subarray configuration is proposed in this paper. Our preliminary application to a seismic array has indicated that the new algorithm can search a p...

We analytically obtain the exact fundamental limit of 4-level amplitude shifted keying formats (4ASK) with direct detection optically preamplified receivers. The optimum multilevel spacing and the corresponding decision thresholds, which depend both on the signal to noise ratio and optical bandwidth, are obtained numerically considering the Chi-squared distribution of each level. The quantum li...