The use of adaptive mesh refinement (AMR) techniques is crucial for accurate and efficient simulation of higher dimensional spacetimes. In this work we develop an adaptive algorithm tailored to the integration of finite difference discretizations of wave-like equations using characteristic coordinates. We demonstrate the algorithm by constructing a code implementing the Einstein-Klein-Gordon sy...

We propose a simple speech compression algorithm using subband division and ADPCM (Adaptive Differential Pulse Code Modulation) algorithm. Although speech data are stored in a semiconductor memory device, its capacity and the available network capacity are limited. Therefore, it is necessary to compress the data as much as possible. The first is that the reconstructed datum must be understood c...

GENVIEW: and GENCODE: are tools for testing the adaptive nature of a genetic code under different assumptions about patterns of genetic error and the nature of amino acid similarity. GENVIEW: provides a user friendly, point-and-click interface by which a user may reproduce and extend analysis of the adaptive properties of the standard genetic code or any of its secondary derivatives. GENVIEW: i...

This paper deals with the problem of blind interference suppression in Direct-Sequence Code Division Multiple Access (DS/CDMA) channels. We investigate the incorporation of linear constraints to the Constant Modulus (CM) criterion to obtain a new blind adaptive receiver that only requires chip synchronization and acquisition of the desired user code. An analysis is presented that shows how line...

Toll Quality Voice-32 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM) MIME Sub-type Registration Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state an...

Abstract— In this paper the higher-order statistics (HOS) specified in terms of partial triple correlation function (TCF) of Gold code is studied. Detection of Gold code is presented using fixed and adaptive threshold techniques and a triple correlation Gold code channelized receiver is proposed. The receiver takes advantage of the TCF and use it for selfsynchronization. The effect of changing ...

Orthogonal Frequency Division Multiplexing (OFDM) is one of recent years multicarrier modulation used in order to combat the Inter Symbol Interference (ISI) introduced by frequency selective mobile radio channel. The circular extension data symbol, commonly referred as cyclic prefix key elements an OFDM transmission scheme. This paper study influence duration on BER performance OFDM-VCPL (Ortho...

In this paper we argue that self-modifying code can become a better strategy for realizing long-lived autonomous software systems than static code, regardless how well it was validated and tested. We base our discussion on three facets – self-repairing software, adaptive software and networked systems – for which we point out ongoing and related work before presenting a roadmap towards a contro...