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The newly developed second generations standards for digital video broadcasting (DVB-T2, DVB-S2) emerges as a significant upgrade over its first generation predecessor. Low-Density Parity-Check (LDPC) codes received a lot of attention by their superb error-correcting capability and have been adopted as main error correct coding scheme by second generation Digital Video Broadcasting standards. The...
Chinese next generation broadcast wireless (NGB-W) systems are aimed to provide high-speed, ubiquitous, and secure broadcast services and tri-play services to massive users. New terrestrial broadcast techniques are needed to support these services in NGB-W systems. In this paper, a new set of quasi-cyclic (QC) low density parity check (LDPC) codes with a moderate code length and a wide operation range...
This paper presents a link quality model for a wireless communication system with distributed turbo coding and lossy forwarding. The model maps the signal-to-interference-plus-noise ratio (SINR) of packet copies received from different links to a mutual information parameter and, in a second stage, converts it to a block error rate. We present the design and foundation of the model and validate its...
Spectrum sharing between radar and communications systems is currently under investigation because of the high demand for new wireless services and shortage of available bandwidth. To effectively design their coexistence, it is crucial to understand how current unaltered radar and communication systems would affect one another. This paper investigates the effect of radar interference on an uncoded...
We propose a low-complexity implementation architecture for turbo product code (TPC) suitable for next-generation fiber optic networks (e.g. ≳ 100 Gb/s). The proposed code makes use of expurgated Bose-Chaudhuri-Hocquenghem (BCH) codes to improve the performance and reduce implementation complexity. In comparison with existing solutions, our results show that the propos d TPC architecture is able to...
Highly reliable LDPC ECC is introduced to improve the reliability of solid-state drives (SSDs). Although conventional AEP-LDPC ECC [3] is 12x highly reliable than BCH ECC, its error-correction capability is degraded due to the burst-errors and inaccurate log- likelihood ratio (LLR). To improve the reliability of TLC NAND flash, this paper proposes the burst-error masking (BEM) and program-disturb...
This article presents a simple, less computational complexity method for constructing exponent matrix (3, K) having girth at least 8 of quasi-cyclic low-density parity-check (QC-LDPC) codes based on subtraction method. The construction of code deals with the generation of exponent matrix by three formulas. This method is flexible for any block-column length K. The simulations are shown in comparison...
In this paper, we focus on the performance imimprovement of the network coding (NC) based hybrid automatic repeat request chase combining (HARQ-CC) scheme. First, considering the joint detection method with the conventional log- likelihood ratio (LLR) calculation, we design the optimal pair of constellation mappings for bit error rate (BER) minimization. Furthermore, we propose a novel remapping-based...
In recent years, iterative receiver has been widely considered since it is able to achieve high data rates and reliable communications for coded MIMO-OFDM systems. However, such a receiver is extremely challenging in practical implementation. In this paper, we present an efficient fixed-point arithmetic of iterative receiver based on low-complexity K-Best decoder in order to reduce the hardware costs...
In this paper, we consider the performance analysis of a decode-and-forward (DF) cooperative relaying (CR) scheme over bursty impulsive noise channel. As compared to existing literature, here, we generalize the performance analysis to the multi-relay scenario with and without considering error propagation from the relays. For this scheme, we evaluate the bit error rate (BER) performance in the presence...
Besides coping with the increasing demand of broadband services, 5th Generation (5G) radio access technology is expected to support mission critical communication (MCC) services targeting very low latencies. In this paper, we investigate the feasibility of the usage of an early Hybrid Automatic Repeat reQuest (HARQ) feedback for reducing the latency of acknowledged transmissions without disregaring...
In this letter, belief propagation (BP) based approximation methods for low density parity check (LDPC) codes are adapted to the Luby transform (LT) soft decoder structure in order to reduce its computational complexity. The bit error rate (BER) performances of the algorithms over the binary input additive white Gaussian noise (BIAWGN) channel are obtained by both theoretically and simulations. For...
The privacy-protection solid-state storage (PP-SSS) system is a proposal for Internet-data's "right to be forgotten", in which data-lifetimes are specified without file-system overhead. In NAND flash memory, the data-lifetimes are controlled by intentionally injecting errors into the data during write, to accelerate retention failure. However, the previously reported PP-SSS [1] has 2 issues,...
Quadrature amplitude modulation has been widely used for high-speed data transmission in modern digital communication systems. In this work, a generalized quadrature amplitude modulation which relaxes the constraint of square lattice is suggested to improve the joint performance of modulation and coding. Bitwise log-likelihood ratios and input signal-to-noise ratios for decoder are analyzed and the...
This paper considers differential amplify-and-forward (D-AF) relaying system employing differential encoding and decoding over time-varying fading channels. A practical multiple-symbol differential sphere detection (MSDSD) is designed to overcome the error floor, which the convectional 'two-symbol' differential detection (CDD) reaches at high signal-to-noise ratio region in fast-fading channels. The...
Low density parity check codes nowadays use in modern system due to their excellent performance. There are different message passing algorithm for LDPC codes to decode. In this paper, we have mention bit flip algorithm in brief and gave its bit error performance over AWGN channel via simulation result. For this communication, we use BPSK i.e. Binary phase shift keying digital modulation technique...
In Communication Systems, signals are transmitted through channel to the Receiver. Generally Receiver are built in order to recover the original message without any error. With the wired communication, the messages are recovered from the wired channel without any errors by considering only the transmitted message from transmit antenna. But now the trends are moved from the wired to wireless communication...
Ambient noise not only influences the data transmission but also causes incorrect CSI. To overcome the low SNR problem, traditional methods usually retransmit the same packet for enough times to increase the SNR. Unfortunately, recently works only focus on the failed data retransmission, yet totally overlook the incorrect channel estimation, which are not efficient for multi-user MIMO WLAN. As long...
The recently approved IEEE 802.11ac WLAN standard has dramatically boosted Wi-Fi capabilities through supporting more data streams, larger bandwidth and more efficient frame-aggregation, leading to significantly higher data rates. The multitude of data rates and MIMO configurations to choose from has made it crucial to develop efficient algorithms for rate adaptation and MIMO mode selection (spatial...
In-band full duplex (IBFD) can theoretically double the throughput of communication systems, and its feasibility has been demonstrated in wireless radio design. It is a promising alternative for the severely bandwidth-limited underwater communication system since it exploits both the temporal and spectral efficiency to the most. Self-interference cancelation is the primary challenge in IBFD's implementation...
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