The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The paper proposes an efficient data transmission protocol for multiple isolated power supplies based on multi-resolution feedback method (MRFM). Adopting the nonlinear sampling method and the digital control technology, the MRFM can reduce the data bits of controlled variables without affecting the control accuracy and dynamic response, and can greatly improve the data transmission rate. In this...
Fault isolation and reconfiguration are very important aspects of distribution network automation. When there is a fault in the distribution system, the loads connected with the fault zone should be separated and the operation pattern can be found by changing the status of the section switches or contact switches. A method of using different fault isolation and reconfiguration measures to deal with...
To achieve high data rate Multi-Carrier Code Division Multiple Access (MC-CDMA) is one suitable choice for next generation wireless communication system. MC-CDMA is the combination of CDMA and OFDM schemes, resulting into getting the advantages of both the schemes. Capacity planning is one of the major issues in designing of wireless communication system. In wireless communication system capacity...
The BP decoding terminates frequently during the early stage for LT codes with the robust Soliton distribution. Generally, more than 90% of undecoded input symbols result from decoding termination within the range 0 ≤ n ≤ k/2, where n and k are the decoded and total number of input symbols, respectively. This study focuses on reducing the symbol loss probability by preventing early decoding termination...
The arithmetic coding is known as a highly efficient entropy coding. However, its encoding and decoding are time-consuming due to the symbol-by-symbol arithmetic operations. Several approaches have been proposed to reduce the computation time by replacing the multiplication with the addition, subtraction or shift operation. However, these approximations cause a loss of the coding efficiency. In this...
We present a study of on the goal-oriented modeling of RE processes executed by a practicing systems development team. The research combines an empirical case study of RE practices with the evaluation and simulation capability of i* modeling. Our analysis focuses on a system implementation project at a mid-size U.S. university and applies the theory of distributed cognition to generate a range of...
This paper is concerned with the multiplication of Ternary numbers using Booth Algorithm. A new encoding table for Ternary input is developed. The Multiplier is encoded using the new approach to perform multiplication of both signed and unsigned Ternary numbers. The proposed encoding reduces the number of adders required compared to the conventional Ternary array multiplier. Simulation results are...
This paper provides analytical derivation for the average pairwise error probability (PEP) of un-coded multiband orthogonal frequency division multiplexing (MB-OFDM) system for Ultra wideband (UWB) communications. To capture the behaviour of UWB channels in terms of cluster arrival rate, ray arrival rate, cluster and ray decay factors, the Saleh and Valenzuela model is employed. It is shown clearly...
Routing is a critical problem in networking technology. The basic problem of QoS routing is to satisfy some network parameters constrained of many conditions which is not only a NP-complete problem but also QoS parameters are nondeterministic even fuzzy. Some practical heuristic algorithms are researched to solve such a problem. Based on Partheno-GA with Binary Coding, the network model and mathematical...
We consider a multiuser multi-way relay channel where all the users need to communicate with the help of a single relay terminal. All the links experience quasi-static Rayleigh fading and there is no CSI available at the transmitters. We propose a half-duplex rateless coded relaying protocol for this model and identify its benefits over fixed-rate relaying strategies. Using outage probability and...
We consider wireless multicasting over lossy links and explore the benefit of cooperative strategies in which multicast receivers exchange messages. A key feature of the problem considered here is that the source downlink channel has a higher loss rate than the channels between pairs of receivers; this feature implies that completion time may be reduced by offloading transmissions to receiver-receiver...
A new technique for constructing the Quasi Cyclic Low density Parity Check (QC-LDPC) codes based on splitting rows into sub rows method is proposed. The proposed QC-LDPC code, at BER of 10−6 achieves 0.1dB coding gain over the PEG-LDPC codes. Moreover, in the high Eb / N0 region, the proposed code with girths 16 and 20 respectively, achieve 0.056 dB and 0.27 dB at a BER of 10−5 over the randomly constructed...
In AVS and H.264/AVC, Lagrangian Rate distortion (RD) optimization techniques are widely adopted for coding mode selection and displacement vector estimation. The optimal Lagrange multipliers in these two cases are both floating-point values. If RD optimized video encoder is implemented on computation-constrained fixed-point platform such as FPGA and ASIC, fixed-point Lagrange multiplier selection...
Coefficient scanning plays an important role in block-based image and video coding standards, such as JPEG, MPEG, and the latest H.264/AVC. In these coding standards, the zigzag scanning method is used for image / frame coding and the field scanning method is used for field coding. Although these scanning methods can achieve acceptable coding efficiency, they do not take the statistical properties...
Wireless sensor networks (WSN) is becoming large-scale. It's meaningful to gather sensor data quickly and efficiently. In this paper, we present a new approach to collect sensor data by distributed rateless coding. Rateless codes, such as Luby Transform (LT) codes have been proved possessing a very good property that receivers can decode all k original packets from arbitrary k(1+ε) encoded packets...
A multi-edge framework for unequal error protecting (UEP) LT codes is derived by distinguishing between the edges connected to each protection class. Under the framework introduced, two existing techniques for the design of unequal error protecting LT codes can be evaluated and explained in a unified way. Furthermore, a simple and flexible design technique is proposed for UEP LT codes with good performance.
Serial link interconnection has generated a lot of attention in on-chip bus design due to its advantages over multibit parallel interconnection in terms of crosstalk, skew, and area cost. However, serializing a multi-bit parallel bus tends to increase the bit transition and power dissipation. This paper proposes an embedded transition inversion (ETI) coding scheme that uses the phase difference between...
This paper considers maximum a posteriori (MAP) decoding of the maximum transition run (MTR) codes, over two-head digital magnetic recording system. Decoding is based on Bayesian algorithm and computes a posteriori log-likelihood ratios (LLR) from codewords of the MTR code. In this paper we present simulation results for performance of the joint soft detection-decoding of a concatenation of MTR code...
In this work, we propose a novel algorithm to combat the clipping noise in Interleave-division multiple access (IDMA) which inherits a peak-to-average power ratio (PAPR) problem especially in large number of multiple accesses. Clipping transmission is efficiently applied to reduce the PAPR to cause the clipping noise which is a weak tradeoff [1][2] to its performance. The proposed algorithm consists...
Wireless Mesh Networks (WMNs) have become an important networking infrastructure for providing cost-efficient broadband wireless connectivity. WMNs are showing their applicability in deployment of medical, transport and surveillance applications in urban areas, metropolitan, neighboring communities and municipal area networks. In this paper, we deal with connectivity and coverage problem of WMN. Because...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.