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This paper proposes a predictive power control for a converter connected to the grid. The power references are sent by a wireless channel with the focus to control renewable sources. The three-phase converter controls the power injected to the grid using a predictive control technique. Simulation results are presented to validate the system operation.
Recent simulation results have shown that serial concatenation with outer codes such as cyclic redundancy check (CRC) or parity check (PC) codes can boost the error correcting performance of polar codes. A theoretical analysis for further explaining where the performance gain comes from is in order. In this paper, we try to provide such an analysis for concatenated polar codes from the distance spectrum...
Data traffic volume including video transmission is increasing exponentially over the past decade. The demand for ultra-high speed wired and wireless communication systems is also growing in an unprecedented pace. In providing ultra-high data transmission rate as well as reliable communications, error correction codes are playing an ever important role. They can ensure received data being highly reliable...
For practical applications in forward error correction, the importance of a systematic codeword cannot be overemphasized. Thus, this paper proposes the construction of a systematic quasi-cyclic (QC) LDPC code. This systematic structure is achieved by a row reduction technique different from the conventional Gaussian elimination method. This row reduction technique has the advantage of being easier...
In order to improve the signal transmission performance of the TSV array transmission, TSV arrays are seen as transmission channels. And a communication channel model with high noise and high crosstalk is established for TSV array transmission. In this paper, a channel concatenated coding transmission scheme is proposed to apply the concatenated code to the TSV array transmission model. Its purpose...
As a form of urban rail transit, medium-low speed maglev transportation system also requires safety-critical design in its operation and control system (OCS), for the OCS system relates to not only operation efficiency, but system reliability and safety as well. The train positioning system, which is the most important component in OCS, counts the real-time train position and helps OCS to give the...
Medium-low speed maglev, as a form of urban rail transportation system, has already drawn a lot of attention from researchers and engineers for its advantages of low noise, strong climbing ability and flexible route planning. The train positioning system, as a matter of fact, is a very important part in operation and control system (OCS) of medium-low speed maglev transportation, for it collects real-time...
In this invited paper, we describe a rate-adaptive FEC scheme based on LDPC codes together with its software reconfigurable unified FPGA architecture. By FPGA emulation, we demonstrate that this class of rate-adaptive LDPC codes based on shortening with an overhead from 25% to 42.9% provides a coding gain ranging from 13.08 dB to 14.28 dB at a post-FEC BER of 10−15 for BPSK transmission. In addition,...
In this invited paper, both binary and nonbinary LDPC codes suitable for optical transmission systems are described. The corresponding FPGA implementation has been discussed as well. The use of adaptive LDPC coding to deal with time-varying optical channel conditions is described as well.
In this paper, we mainly focus on the optimization of multi-level coded modulation scheme in terms of sub-channel code rate optimal assignment and irregular QC-LDPC code construction with the aid of EXIT chart analysis. Simulation results show that the proposed MLCM scheme can achieve additional 0.1dB NCG compared with the UEP coded modulation scheme.
Several types of insertion/deletion/substitution error correction codings have been proposed for channels with imperfect synchronization. Most of the conventional coding schemes assume insertion/deletion errors of bit granularity, while in some applications, e.g. bit patterned media recording, insertion/deletion errors occur as a result of accumulation of small synchronization errors. This paper considers...
This paper presents channel model and error correction coding for correlated insertion/deletion errors in high-density magnetic recording media. Simulation results show that the bit error rate can be lowered by the presented coding.
We introduce a model of a combination of particular low density parity check (LDPC) code and quadrature-quadrature phase shift keying (Q2PSK) constellation for the application of the downlink of the unmanned aerial vehicle (UAV) data chain. This model is a modification of the combination of LDPC code and constant envelope Q2PSK (CEQ2PSK) constellation. It achieves higher bandwidth efficiency of 4/3...
Low-density parity-check (LDPC) codes are known for superior performance over a wide range of codes for communication and memory systems. In many practical scenarios, adaptive ECC system is preferred that can adapt to various codes with varying channel conditions since the behavior of errors changes with time and space. This paper presents two architectural designs for efficient encoding of LDPC codes...
Modern communication and computation systems consist of large networks of unreliable nodes. Yet, it is well known that such systems can provide aggregate reliability via information redundancy, duplicating paths, or replicating computations. While redundancy may increase the load on a system, it can also lead to major performance improvements through the judicious management of additional system resources...
Owing to their capacity-achieving performance and low encoding and decoding complexity, polar codes have drawn much research interests recently. Successive cancellation decoding (SCD) and belief propagation decoding (BPD) are two common approaches for decoding polar codes. SCD is sequential in nature while BPD can run in parallel. Thus BPD is more attractive for low latency applications. However BPD...
We study potential enhancement of the read access speed in high-performance solid-state drives (SSDs) by coding, given speed variations across the multiple flash interfaces and assuming occasional local memory failures. Our analysis is based on a queuing model that incorporates both read request failures and node failures. It provides a clear picture on the coding-overhead and read-access-time trade-offs...
In this paper, we propose a design of spatially coupled repeat-accumulate (SC-RA) codes over a three-phase bidirectional relay. The channels between the nodes are assumed binary input additive white Gaussian noise (BIAWGN) channels, while decode-and-forward (DF) relaying is considered at the relay. We present low complexity density evolution analysis for the proposed bidirectional relay code, which...
In this paper, we propose new Raptor codes suitable for uplink Internet of Things using single carrier transmission technique (SC-IoT) with low density parity check (LDPC) codes as the precode, called LDPC-Raptor codes. The utilization of LDPC as the precode is to guarantee high capability of error correction for better Raptor codes performance while keeping the computational complexity low. Raptor...
Mojette Transform (MT) based erasure correction coding possesses extremely efficient encoding/decoding algorithms and demonstrate promising burst erasure recovery performance. MT codes are based on discrete geometry and provide redundancy through creating projections. Projections are made of smaller data structures called bins and are generated from a two dimensional convex-shaped data. For exact...
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