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This paper treats the digital design of a probabilistic energy equalizer for impulse radio (IR) UWB receiver in high data rate (100 Mbps). The aim of this study is to bypass certain complex mathematical function as a chi-squared distribution and reduce the computational complexity of the equalizer for a low cost hardware implementation. As in Sub-MAP algorithm, the max* operation is investigated for...
Network coding has recently attracted a lot of interest from the research community, mainly due to its simplicity of application and the large number of applications it can be suited for. Research in network coding started on wired networks, but the researchers soon came to realize that the inherent properties of the wireless medium render it a fertile ground for the application of network coding,...
Multiple-input multiple-output (MIMO) techniques have been incorporated in all of the recently developed wireless communications systems standards including the IEEE 802.11 n standard for local area networks and the IEEE 802.16 e standard on which mobile WiMAX systems are based. The main criteria in conventional space-time code (STC) design for MIMO systems are the code rate, diversity order, and...
The Fourier-based unitary space-time modulation (USTM) originally proposed for multiple co-located transmit antennas is applied to wireless relay networks. The scheme allows the relays cooperate with each other, emulate a virtual array of transmit antennas, and perform distributed USTM (DUSTM) of the source signals. It is assumed that the relays have no information of all the channels, while the destination...
For LDPC decoding, bit-flipping (BF) algorithms are much simpler than the min-sum algorithms (MSA). However, BF algorithms have the disadvantages of poorer performances and higher iteration counts than MSA. To increase the BF performances, this paper presents a novel BF algorithm, called Low-Correlation Multibit-flipping (LCMBF) algorithm, which flips more than one bit in each iteration. High performances...
A wireless sensor network (WSN) consists of a large number of small sensor nodes that collect data and send it to a base station, with the help of other nodes. Securing unattended WSNs is a challenging task as networks can be subjected not only to the traditional attacks on wireless networks including eavesdropping and jamming, but also new attacks due to physical insecurity of the nodes. Providing...
Structured LDPC codes enable low-complexity decoding as well as efficient implementation of encoder reducing the complexity down to the order of the number of parity-check bits. Construction of structured LDPC codes is based on combinatorial approaches such as balanced-incomplete block-design (BIBD) and finite fields to design quasi-cyclic LDPC (QC-LDPC) codes. Well designed QC-LDPC codes can perform...
Quality assessment of mobile and wireless multimedia services including image and video applications has gained increased attention in recent years as a means of facilitating efficient radio resource management. In particular, approaches that utilize perceptual-based metrics are becoming more dominant, as conventional fidelity metrics such as the peak signal-to-noise ratio (PSNR) may not correlate...
In this paper, we consider a 2-hop wireless relay network where more than one relay is available. We explore optimal relay selection for decode-and-forward cooperative protocol to minimize the outage probability under a short-term power constraint. We first investigate the impact of power control on relay selection from a capacity point-of-view. Assuming the knowledge of channel gain magnitudes, we...
The bit-error-rate (BER) performance of an LDPC decoding algorithm will be seriously degraded when the algorithm is realized with fixed-point implementation in practical applications, due to the introduced quantization errors and rounding errors. To remedy the problem, this paper proposes an improved min-sum algorithm (MSA), called CMVP algorithm. It achieves better performances than the popular min-sum...
A combination of MIMO and network coding for one dimensional (1D) topology in wireless mesh network has been proposed in recent literature. The technique supplies higher network capacity compared to that of conventional schemes. In this paper, the authors extend MIMO network coding to two dimensional (2D) topology. Owing to the efficient sharing of frequency of network coding and co-channel interference...
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