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Orthogonal Frequency Division Multiplexing, together with Multiple-Input Multiple-Output, is a pillar technique for new generation mobile networks, i.e., for the mobile networks in direction of 5G. Its crucial properties of robustness against fading and Inter-symbol Interference make it a great choice for the demanding data rates of future mobile networks. This paper presents a technique for additional...
Polar codes under cyclic redundancy check-aided successive cancellation list (CA-SCL) decoding can outperform the turbo codes and the LDPC codes at the cost of high complexity and decoding delay. In order to reduce the decoding complexity, in this paper we propose a hybrid parity-check and CRC aided SCL decoding scheme for polar codes. Simulation results under the binary input additive white Gaussian...
UnionPay's inter-bank transaction settlement platform (ITSP) generates a huge amount of bankcard transaction data everyday, recording different bankcard activities. In order to unleash the business value of these data, UnionPay has built a customized data warehouse based on Hadoop to manage and query the massive data imported from ITSP. However, the original system suffers from low storage utilization...
The Resource Description Framework (RDF) data model, is used on the Web to express billions of structured statements in a wide range of topics, including government, publications, life sciences, etc. Consequently, processing and storing this data requires the provision of high specification systems, both in terms of storage and computational capabilities. On the other hand, cloud-based big data services...
Recent advances in rateless codes facilitate the utilization of dense constellation. By exploiting more constellation points with controlled symbol distance, they ensure higher transmission date rate and better diversity gain against fading. In this paper, we observe that there exists certain redundancy in the existing dense constellation diagram. With proper design, such redundancy can be can be...
We propose a joint list decoder and language decoder that exploits the redundancy of language- based sources during polar decoding. By judging the validity of decoded words in the decoded sequence with the help of a dictionary, the polar list decoder constantly detects erroneous paths after the decoding of every few bits. This path-pruning technique based on joint decoding has advantages over stand-alone...
Coded packet networks allow for proactive injection of redundant packets to compensate for packet loss. Link metrics are usually based on the estimated transmission counter (ETX). This metric is used to determine the expected number of coded packets needed, but does not make guarantees for a specific decoding probability. In this paper we show that relying on the ETX metric leads to a surprisingly...
In volatile network environments, node connectivity and availability changes rapidly. This poses a challenge to efficient repair of failed nodes in distributed storage with erasure-correcting code. The commonly considered bandwidth-efficient data regenerating schemes either rely on availability of specific storage nodes in the network, or require a substantial number of repair nodes. We propose a...
We propose two rate selection methods in wireless multicast systems where an incremental redundancy type hybrid automatic repeat request (HARQ-IR) scheme is employed under Rayleigh block-fading channels. We aim at maximizing the long-term average transmission rate (LATR) while the maximum number of retransmissions is limited to L − 1 and the probability that at least one user fails to decode a message...
This paper proposes an efficient rateless low-density parity check (LDPC) codes for satellite broadcasting system. The proposed scheme uses the conventional LDPC codes specified in recent digital video broadcasting via satellite (DVB-S) standards, and concatenate them with Luby transform (LT)-like codes in order to form systematic rateless codes. In this way, redundant parities can be made at the...
In modern communication systems, there is content redundancy inside the transmitted data no matter what source codes are adopted. This paper introduces machine learning method to utilize content redundancy and perform content recognition, in order to provide side information for error control coding (ECC) and improve performing. It shows that content recognition for English text, based on Trie and...
This paper presents an implementation of a colored 2D-barcode which is based on the structure of the CQR Code (Colored Quick Response Code). While the first version of the CQR Code (CQR Code-5) is a 2-D barcode of 5 colors, this new version (CQR Code-9) has 9 colors. In this paper we describe the implementation details of this new CQR Code. This new version of the CQR Code can store up to 2,048 information...
We propose a forward error correction scheme for asynchronous sensor communication where the dominant errors consist of pulse deletions and insertions, and where encoding is required to take place in an instantaneous fashion. The presented scheme consists of a combination of a systematic convolutional code, an embedded marker code, and power-efficient frequency-shift keying (FSK) modulation at the...
For the next generation mobile video broadcasting, especially in-band solutions that serves the mobile devices, a limited feedback scheme via cellular channel polling is feasible to give accurate real-time information on the broadcast receivers' channel erasure rate, and decoding buffer status. In this work, we propose an AL-FEC coding degree scheme based on this feedback, to achieve a better decode...
We propose a practicable rate-adaptive FEC scheme defeating degradation due to high baud rate and increase of circuit complexity. The preferable coding gains of 13.0–17.5 dB are obtained for 25.5–149.5% redundancies.
Light field imaging is a promising new technology that allows the user not only to change the focus and perspective after taking a picture, as well as to generate 3D content, among other applications. However, light field images are characterized by large amounts of data and there is a lack of coding tools to efficiently encode this type of content. Therefore, this paper proposes the addition of two...
With the rapid shift from end-to-end communications to content-based data retrieval, there are increasing interests in exploiting Content-centric Networks (CCN) to deliver data. As the special characteristics of CCN, in-network caching and naming-based routing make traditional TCP-like transmission control protocol unsuitable. Although there are some existing efforts on improving the congestion control...
Many techniques have been proposed to improve the reliability of on-chip memories (e.g., caches). These techniques can be broadly characterized as being based on either errorcorrecting codes, side-information from built-in self test (BIST) routines, or hybrid combinations of the two. Although each proposal has been shown to be favorable under a certain set of assumptions and parameters, it is difficult...
Mixed-excitation linear prediction (MELP) is a United States department of defense speech coding standard used mainly in military applications and satellite communications, secure voice, and secure radio devices. MELP vocoder could provide an acceptable voice quality over prone erroneous channels in various environments by exploiting redundancy statistics of voice data. This paper explains performance...
In joint source-channel arithmetic coding, a forbidden symbol (FS) is added to the symbol set to make it more robust against transmission errors. By splitting the interval occupied by the FS into subintervals, various configurations are possible. In this paper, the delay probability function (DPF), the probability of the number of bits required to detect an error, is calculated for various FS configurations...
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