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Slide rectangular window structure for QC-LDPC codes (SRW-QC-LDPC) with flexible code lengths and code rates is proposed, which aim to eliminate the cycles of length 4 without computer search. The parity-check matrix would have different extension factors and structures by using the slide rectangular window in the base matrix, the degree distribution is optimized by the optimal diagonal method. Because...
In this paper, we devise an efficient joint source-channel coding scheme for robust image transmission over noisy channels. We firstly present a novel interleaver, named unequal row column cyclic cross interleaver, which could improve the error correction capability of turbo codes effectively. Secondly, we devise two types of asymmetric turbo codes which consist of the parallel concatenated turbo...
The rapid development of social networking has been observed in recent years. Social networking provides an online platform for building relationships, sharing some interested things, and interaction with other people. Due to these characteristics of social networking, this also brings a great chance for the interactive learning, which will be called micro-learning in this paper. After briefly introducing...
In this paper, we firstly present a novel interleaver to improve the error correction performance of turbo codes. Secondly, we devise two types of asymmetric turbo codes to optimize the bit error rate of both water fall and error floor. Finally, we propose an efficient joint source-channel coding scheme based on unequal error protection technology using asymmetric turbo codes. The proposed scheme...
In the paper, blind MVDR detector is implemented using a simplified cascaded modular structure. A vector filter is introduced for adaptive interference cancellation in each module of the structure and the weight vector is determined based on a maximum magnitude cross correlation criterion which maximizes the magnitude of the cross correlation between the output of the nonadaptive filter and that of...
Network utility maximization provides an important method for network architecture and distributed algorithm design. This method is often used in previous work as a determining utility model, but in practice the utility model of users in networks is stochastic. In this paper, stochastic network utility maximization is transform into determining model by optimizing time averages, then it is easy to...
Two types of asymmetric turbo codes are proposed, i.e., the parallel concatenated turbo codes that use the non-identical component encoder with different constraint lengths and mixed types of generator polynomials. The proposed schemes can optimize the BER performance of both water-fall region at low SNR and error-floor region at high SNR. The simulation results show the presented asymmetric turbo...
Multicast support is critical and a desirable feature of wireless mesh networks (WMNs). In this paper, we propose an approach to joint optimizing rate allocation of flows and power consumption of links for forwarding data flows for overlay multicast in WMNs. We develop a distributed algorithm based on pricing scheme by using dual decomposition technique. The "price" is associated with each...
Existence of multiple paths between any pair of source and destination nodes make multi-path transport suitable for Courseware-on-Demand (CoD) services over Wireless Mesh Networks (WMNs). Due to the limitation of mesh client upload capacities, the optimal mesh client selection to construct high-quality streaming topology represents a major challenge in WMNs. This paper proposes a fully distributed...
Due to the thriving of mobile network and portable device, distance learning is evolved from desktop computer to mobile device. Real-time handover is a very important capability for mobile learning devices since the interruptions caused by handover make learners feel frustrated and lose their interests, which in turn resulting in less engagement in mobile learning. In this paper, we propose a collaborative...
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