Consider a multi-source network coding problem with correlated sources. While the fundamental limits are known, achieving them, in general, involves a computational burden due to the complex decoding process. Efficient solutions, on the other hand, are by large based on source and network coding separation, thus imposing strict topological constraints on the networks which can be solved. In thi...

In practice, interlaced video sequences are typically coded with either a frame-only or fieldonly structure, irrespective of the content. However, coding in this way will not provide the best coding efficiency. This paper proposes an adaptive picture-level field/frame coding scheme with corresponding rate control. First, a two-pass field/frame decision scheme is proposed. In this scheme, we for...

A new class of two-channel lter banks having integer lter coeecients is proposed. The integer lter coeecients are obtained by maximizing for subband coding gain. The number of bits required to represent the subband samples are kept low through eecient nonlinear implementation techniques. Several integer coeecient lter banks are tested for lossless image compression. An octave-band (dyadic) freq...

Video compression with improved visual quality and with temporal redundancy reduction is a challenging task. Video coding standards such as H.261/3, MPEG-1/2/4 and H.264/AVC use motion estimation (ME) scheme to remove temporal redundancy which significantly improves the coding efficiency. However, the peak signal-to-noise ratio is less. A new video coding method is proposed based on Singular Va...

A joint scheme combining error-control coding (ECC) with complex-field coding (CFC) is proposed for space-time communications through flat or frequency-selective fading multiple-input multiple-output (MIMO) channels. It is shown that the diversity gain of this joint coding scheme is the product of the free distance of the ECC, the complex-field block encoder size, and the number of receive ante...

Recently, an MPEG2 AAC [1] based lossless audio codec with the Integer MDCT (IntMDCT) was proposed [2]. The IntMDCT was constructed by lifting scheme [3] to hold the perfect reconstruction(PR). In this paper, we will evaluate the IntMDCT implemented by fixed-point arithmetic with quantized lifting coefficients in the MPEG2 AAC based lossless audio coding. The results indicate that there exists ...

In this paper we propose a joint source-channel coding scheme for transmission of images over noisy channels. In this scheme, the interaction between the source coding and the channel coding is through a small number of parameters. A robust source coder based on classiication of coeecients of Discrete Wavelet Transform of the image is coupled with a exible error control scheme which uses a bank...

To reduce delay and network congestions caused by traditional network coding techniques, in this paper, we propose a Partial Network Coding based Real-time Multicast (PNCRM) scheme for supporting real-time multicast services in Mobile Ad-hoc Networks. This scheme combines the idea of partial network coding with the meshbased real-time multicast scheme together. It can not only reduce the end-to...

The H.264/AVC video coding standard supports motion-compensated prediction with quarter-pel accuracy of motion vectors. In the case of fractional-pel motion vector, pixels at fractional positions have to be interpolated. In an interpolation scheme, the two most important criteria are computational complexity and coding efficiency. In order to enhance both the computational complexity and coding...

This tutorial paper describes a general adaptive coded modulation scheme for airlinks in urban wireless networks. Each airlink is degraded by shadowed Nakagami multipath fading, interference from other airlinks, and signal path loss. An instance of the adaptive coding scheme utilizes a set of trellis codes originally designed for additive white Gaussian noise channels. A model of the worst and ...