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.
In this paper, we study the design and the delay-exponent of anytime codes over a three terminal relay network. We propose a bilayer anytime code based on anytime spatially coupled low-density parity-check (LDPC) codes and investigate the anytime characteristics through density evolution analysis. By using mathematical induction technique, we find analytical expressions of the delay-exponent for the...
LDPC (Low Density Parity Check) is a channel coding technique is used to correct errors so that the validity of a data transmission on the noise transmission channel guaranteed for accuracy. LDPC is suitable for applications that require a large bandwidth, high reliability, and high noise channel like DVB-S2 (Digital Video Broadcast-Satellite) application. Despite the high level of complexity, LDPC...
The algorithm of choice an optimal combination of multiposition keying and antinoise code is proposed in this paper. The criterion for selecting the optimal combination is the maximal productivity in base station coverage area of mobile communication.
In this paper, we present two variations on a linear physical-layer security code for the binary erasure wiretap channel, and examine their performance using small blocklength LDPC codes at rates above the secrecy capacity. We consider the maximum-likelihood attack, along with a message-passing attack, and show how the proposed codes enhance security in each case. Unique security metrics are employed...
A scaling technique is proposed to maintain the decoding failure probability of Vector Symbol Decoding (VSD) with the increase in data rate. Specifically, the symbol size must be increased in the same ratio as the data rate. VSD is attractive since it allows for a very flexible scaling. This paper also presents a way to compute the optimal maximum number of syndromes to minimize the complexity of...
Low-Density Parity-Check (LDPC) codes with linear time encoding complexity and low hardware storage are a hot issue recently. We propose a general method for constructing LDPC codes with quasi-cyclic (QC) structure and improved zigzag pattern to obtain both linear time encoding and low hardware storage. We call it irregular repeat accumulate like (IRA-like) codes for its similarity with irregular...
In this decade, WBAN plays vital role in health care monitoring environment. It has been used more intensively in wider applications. This paper proposes error control coding applied to WBAN. LDPC codes with the block size of 255 bytes are particularly of interest. Patterned information such as MIT-BIH's arrhythmia datasets extracted from Electrocardiography (ECG) of the patients who encountered heart...
We review single parity check based bit-interleaved coded modulation with iterative decoding in fiber optic systems. Coded modulation achieves high SNR sensitivity and large Euclidean distance and can remove phase ambiguity which allows approaching nonlinear Shannon limit.
In this paper, we discuss and present some recent advances in the field of error correcting codes and discuss their applicability for lightwave transmission systems. We compare polar codes and spatially coupled codes and present recent modifications of the latter.
Non-orthogonal multiple access improves spectral efficiency through sharing the same frequency resource with multiple wireless terminals. In previous researches, it has been shown that a log likelihood ratio (LLR) calculated from a signal on the sharing spectrum should be masked to zero if the power of an interference signal is stronger than that of a desired signal. This implies that the spectrum...
In the field of communication, coding the data is the most crucial part. Since transmission channel is very much susceptible to noise, it becomes imperative to channel code the data to be transmitted. This paper presents an improved and faster Low Density Parity Check (LDPC) based algorithm, for channel coding grayscale images of 'n*n' dimension. It constructs the encoded image, by arranging bits...
In this paper, we present an extension of the semi-definite programming formulation of the optimal rate code design in single link Binary Erasure Channel (BEC) proposed by the authors to the Binary Erasure Multiple Access Channel (BE-MAC) with two sources correlation. This new way can be easily extended to the multiple access senders. Simulation results show the efficiency and effectiveness of the...
In this paper, we provide a general form for sparse generator matrices of several families of Quasi-Cyclic Low-Density Parity-Check codes. Codes of this kind have a prominent role in literature and applications due to their ability to achieve excellent performance with limited complexity. While some properties of these codes (like the girth length in their associated Tanner graphs) are well investigated,...
Low-density generator matrix (LDGM) codes can be generated through instantaneous network topology with XOR operation at each node in original adaptive network coded cooperation (ANCC). Regular LDGM codes exhibit tradeoff nature between error floor and convergence threshold due to the low weight columns in the resulting parity check matrix. In this paper, we propose a scheme called serially-concatenated...
Error Correcting Output Coding (ECOC) is a widely used and successful technique that implements a classification system by splitting a multiclass problem into a set of dichotomies according to a coding matrix. In this paper we propose a new approach for the ECOC systems based on a well-known family of error correcting codes in the Coding Theory: the Low Density Parity Check (LDPC) codes. The goal...
The low-density parity-check (LDPC) codes are used to achieve excellent performance with low encoding and decoding complexity. One major criticism concerning LDPC codes has been their apparent high encoding complexity and memory inefficient nature due to large parity check matrix. More generally, we consider the encoding problem for codes specified by sparse parity-check matrices. We show how to exploit...
Storing multiple bits in a flash memory cell is a primary technique to linearly increase flash memory capacity, but memory endurance is tremendously sacrificed. This paper presents a multilevel fault tolerance technique for MLC flash memories. The main idea is to explore multi-level forward error correction (FEC) for multiple bits in a flash cell. The associated practical implementation issues are...
Erasure codes with different parameters provide a wide range tradeoff between the reliability and spatial redundancy to the distributed storage. This paper proposes a technique to auto-configure the parameters of the erasure codes based on the users' requirements and the current status of the distributed storage system. The basic principle behind this technique is to incorporate the requirements of...
This paper investigates the achievable very high throughput (VHT) of the emerging IEEE 802.11ad standard operating at 60 GHz ISM band. The specified modulation and coding schemes are evaluated in a 60 GHz conference room channel. Two IEEE 802.11ad physical layers were considered namely, orthogonal frequency division multiplex (OFDM) physical layer and single carrier (SC). Evaluation was conducted...
This paper proposes an architecture for structured low density parity check encoder. The proposed architecture supports the limitation of input/output pins of field programmable gate array using division of information bits. The division of information bits generates latency of encoding. The proposed architecture does not store the required matrix for bit-wise multiplication and does not use cyclic...
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.