Compression is desirable for network applications as it saves bandwidth; however, when data is compressed before being encrypted, the amount of compression leaks information about the amount of redundancy in the plaintext. This side channel has led to successful CRIME and BREACH attacks on web traffic protected by the Transport Layer Security (TLS) protocol. The general guidance in light of the...

A method for improving the contrast resolution of B-mode images is proposed by combining the speckle reduction technique of frequency compounding (FC), and the coded excitation and pulse compression technique called resolution enhancement compression (REC). FC suppresses speckle but at the expense of a reduction in axial resolution. Using REC the axial resolution and bandwidth of the imaging sy...

Today’s hardware graphics accelerators incorporate techniques to antialias edges and minimize geometry-related sampling artifacts. Two such techniques, brute force supersampling and multisampling, increase the sampling rate by rasterizing the triangles in a larger antialiasing buffer that is then filtered down to the size of the framebuffer. The sampling rate is proportional to the number of su...

A serious bottleneck in multimedia E-learning is the non-availability of required bandwidth. While much research has been done on Multimedia compression and network resource optimization, multimedia delivery is still a big concern especially for scarce resource networks. The virtues of network aware video coding and application of domain specific compression techniques have not yet been fully e...

The JPEG compression algorithm is widely used in communications technology for multimedia data transmission. This algorithm is also very efficient for mobile applications since it can achieve compression ratios more than 100:1, thus greatly facilitating the storage and transmission processes for images. Though lossless JPEG compression is an ideal solution, the compression ratio achieved with t...

The calculation of antenna has been an interesting and a controversial topic for years. In this paper, we first give a rigorous study of antenna by introducing a complete description of the complex power balance relation for an antenna system. Using the complex Poynting theorem, we have shown that the antenna is essentially equivalent to a one port lossy network. The Foster reactance theorem is...

This article presents the theoretical relationship between signal power, distortion, and bandwidth for several source and channel models. It is intended as a reference for the evaluation of the performance of specific data compression algorithms.

The paper is motivated by the need to develop low bandwidth virtual humans capable of delivering audio-visual speech and sign language at a quality comparable to high bandwidth video. The number of bits required for animating a virtual human is significantly reduced by using an appearance model combined with parameter compression. A new perceptual method is introduced and used to evaluate the q...

The impact of carrier pulling on the modulation characteristics of a transistor laser is discussed. The results of a theoretical analysis of modulation bandwidth and damping effect show that the carrier transport effect obtained by using a transistor laser allows for a gain compression factor of about one-tenth that of a conventional laser (0.7×1017 cm3), as well as for a maximum modulation ban...

In conventional radar systems the receiver bandwidth is designed to be similar to be bandwidth of the transmit pulse. For a given range sample estimates are averaged over time to improve the estimation accuracy. A number of methods have been proposed in the past for improving the quality of estimates without sacrificing range resolution (Mudukutore et al, 1998). Schemes using shorter pulsewidth...