We investigate practical methods of distributed interference avoidance where users iteratively adapt their codewords in response to global feedback from the receiver. In turn, the receiver adaptively tracks user codewords and offers a reasonable alternative to feeding back codewords. We introduce variants of standard interference avoidance procedures which produce more easily tracked incrementa...

We present first results obtained with a 3+1 dimensional adaptive mesh code in numerical general relativity. The adaptive mesh is used in conjunction with a standard ADM code for the evolution of a dynamically sliced Schwarzschild spacetime (geodesic slicing). We argue that adaptive mesh is particularly natural in the context of general relativity, where apart from adaptive mesh refinement for ...

Adaptive mesh refinement (AMR) is a state-of-the-art technique for the efficient numerical solution of partial differential equations (PDE) exhibiting multiple widely differing spatial scales. Recently, spacetree-based AMR has been established as a promising approach to structured AMR (see for example [1]). In the talk the integration of the two software modules PyClaw [2] and Peano [4] is pres...

centroid, 19, 25, 30 circular displacement, 102 code convolutional, 36, 58 Elias, 256 Gallager-vanVoorhis, 255 Golomb, 218, 254 Golomb–Rice, 188 Levenstein, 256 monotonic, 254 prefix-free, 239 terminated convolutional, 37 trellis, 38 unary, 254 zero-tail terminated convolutional, 37 codebook, 26, 27 adaptive, 154 adaptive gain, 155 stochastic, 156 stochastic gain, 156 codec ACELP, 158 code exci...

A cell by cell adaptive mesh technique is described and implemented to solve the Euler equations. The adaptive mesh scheme builds upon a staggered grid Lagrangian code similar to the AWE code CORVUS. The mesh is automatically refined in a cell by cell manner using a solution gradient refinement criteria. The method has the automatic response of adaptive mesh refinement but without storing and s...

This paper presents an adaptive forward error correction (AFEC) protocol that provides a reliable communication service for real-time trafflc over low-earth orbit (LEO) satellite networks. In time-varying wireless links, such as LEO satellite networks, a reliable channel estimation scheme with an appropriate code selection technique is essential for adaptive error-control systems. This paper pr...

We consider interference suppression for direct sequence code division multiple access systems when long codes are used for spreading. In particular, we evaluate the performance of a Least Mean Square (LMS) type adaptive receiver on AWGN and correlated Rayleigh fading channels. The receiver uses a chip matched filter followed by an adaptive equalizer structure which performs despreading and int...

This paper represents a comparative Study of filter algorithms Least Mean Square (LMS), Normalized Least Mean Square (NLMS) and Recursive Least Square (RLS) by considering a Quasi Orthogonal Space Time Block Code (QOSTBC) encoded Multiple Input Multiple output (MIMO) Code Division Multiple Access (CDMA) system. MIMO-CDMA system has been currently acknowledged as one of the most competitive tech...

Future mobile communication requires 100 Mbps data rate, video and audio streaming, asymmetric, multiple access, adaptive modulation and code rate, dynamic packet arrangement, adaptive antenna and IPv6 utilization facility to enhance lossless communication. We propose an Adaptive Modulation and Rate Coding Multi Carrier Code Division Multiple Access (AMRC-MC-CDMA) technique is a promising way t...

Recently, a smart antenna, i.e., a blind adaptive antenna array, has attracted much attention to improve the capacity of a future code-division multiple-access wireless communications system. It has been demonstrated (Tanaka et al., 2000) that there is significant improvement in data demodulation through lab simulations and field experiments by employing a smart antenna of multiple elements. Ho...