scholarly journals Energy Efficiency of a Decode-and-Forward Multiple-Relay Network with Rate Adaptive LDPC Codes

Sensors ◽  
2019 ◽  
Vol 19 (21) ◽  
pp. 4793 ◽  
Author(s):  
Bushra Bashir Chaoudhry ◽  
Syed Ali Hassan ◽  
Joachim Speidel ◽  
Haejoon Jung
Keyword(s):  
Energy Efficiency ◽  
Channel Coding ◽  
Forward Error Correction ◽  
Ldpc Codes ◽  
Maximum Energy ◽  
Cooperative Transmission ◽  
Relay Network ◽  
Decode And Forward ◽  
Forward Error ◽  
Multiple Relay

This paper presents cooperative transmission (CT), where multiple relays are used to achieve array and diversity gains, as an enabling technology for Internet of Things (IoT) networks with hardware-limited devices. We investigate a channel coding aided decode-and-forward (DF) relaying network, considering a two-hop multiple-relay network, where the data transmission between the source and the destination is realized with the help of DF relays. Low density parity check (LDPC) codes are adopted as forward error correction (FEC) codes to encode and decode the data both at the source and relays. We consider both fixed and variable code rates depending upon the quality-of-service (QoS) provisioning such as spectral efficiency and maximum energy efficiency. Furthermore, an optimal power allocation scheme is studied for the cooperative system under the energy efficiency constraint. We present the simulation results of our proposed scheme, compared with conventional methods, which show that if decoupled code rates are used on both hops then a trade-off has to be maintained between system complexity, transmission delay, and bit error rate (BER).

Improved Energy Efficiency for Optical Transport Networks by Elastic Forward Error Correction

2014 ◽  
Vol 6 (4) ◽  
pp. 397 ◽  
Author(s):  
Anders Rasmussen ◽  
Metodi P. Yankov ◽  
Michael S. Berger ◽  
Knud J. Larsen ◽  
Sarah Ruepp
Keyword(s):  
Energy Efficiency ◽  
Error Correction ◽  
Forward Error Correction ◽  
Transport Networks ◽  
Optical Transport Networks ◽  
Optical Transport ◽  
Forward Error

scholarly journals Optimized Polar Codes as Forward Error Correction Coding for Digital Video Broadcasting Systems

Electronics ◽  
2021 ◽  
Vol 10 (17) ◽  
pp. 2152
Author(s):  
Karim El-Abbasy ◽  
Ramy Taki Eldin ◽  
Salwa El Ramly ◽  
Bassant Abdelhamid
Keyword(s):  
Error Correction ◽  
Forward Error Correction ◽  
Digital Video ◽  
Ldpc Codes ◽  
Polar Codes ◽  
Optimized Design ◽  
Digital Video Broadcasting ◽  
Design Point ◽  
Video Broadcasting ◽  
Forward Error

Polar codes are featured by their low encoding/decoding complexity for symmetric binary input-discrete memoryless channels. Recently, flexible generic Successive Cancellation List (SCL) decoders for polar codes were proposed to provide different throughput, latency, and decoding performances. In this paper, we propose to use polar codes with flexible fast-adaptive SCL decoders in Digital Video Broadcasting (DVB) systems to meet the growing demand for more bitrates. In addition, they can provide more interactive services with less latency and more throughput. First, we start with the construction of polar codes and propose a new mathematical relation to get the optimized design point for the polar code. We prove that our optimized design point is too close to the one that achieves minimum Bit Error Rate (BER). Then, we compare the performance of polar and Low-Density Parity Check (LDPC) codes in terms of BER, encoder/decoder latencies, and throughput. The results show that both channel coding techniques have comparable BER. However, polar codes are superior to LDPC in terms of decoding latency, and system throughput. Finally, we present the possible performance enhancement of DVB systems in terms of decoding latency and complexity when using optimized polar codes as a Forward Error Correction (FEC) technique instead of Bose Chaudhuri Hocquenghem (BCH) and LDPC codes that are currently adopted in DVB standards.

scholarly journals Channel Coding in Optical Communication Systems

2016 ◽  
Vol 4 (2) ◽  
pp. 1-5
Author(s):  
Viktor Durcek ◽  
◽  
Michal Kuba ◽  
Milan Dado
Keyword(s):  
Error Correction ◽  
Optical Networks ◽  
Optical Communication ◽  
Channel Coding ◽  
Communication Systems ◽  
High Speed ◽  
Forward Error Correction ◽  
Error Correcting Codes ◽  
Optical Communication Systems ◽  
Forward Error

In this paper, an overview of various types of error-correcting codes is present. Three generations of forward error correction methods used in optical communication systems are listed and described. Forward error correction schemes proposed for use in future high-speed optical networks can be found in the third generation of codes.

scholarly journals Robust IPTV Delivery with Adaptive Rateless Coding over a Mobile WiMAX Channel

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
Laith Al-Jobouri ◽  
Martin Fleury ◽  
Mohammad Ghanbari
Keyword(s):  
Channel Coding ◽  
Forward Error Correction ◽  
Content Management ◽  
Mobile Wimax ◽  
Application Layer ◽  
Ieee 802.16E ◽  
Coding Schemes ◽  
Redundant Data ◽  
Trade Offs ◽  
Forward Error

As intelligent content management of IPTV moves popular material nearer to the end-user, application-layer channel coding schemes, involving the retransmission of extra redundant data, become attractive as a result of the reduced latency. Application-layer, adaptive rateless channel coding is exploited in this paper's scheme to reconstruct streamed video across an IEEE 802.16e (mobile WiMAX) channel. The paper concentrates on the trade-offs in implementing the scheme, showing that exact calculation of the redundant data has the potential to reduce the forward error correction bit-rate overhead. To reduce delay, an appropriate compression rate should also be selected.

scholarly journals Performance Analysis of Coherent Atmospheric Optical Communications with Soft-Decision Forward Error Correction

2013 ◽  
Vol 347-350 ◽  
pp. 1856-1859
Author(s):  
Jin Jing Tao ◽  
Jin Nan Zhang ◽  
Yang An Zhang ◽  
Yong Qing Huang ◽  
Xue Guang Yuan ◽  
...  
Keyword(s):  
Forward Error Correction ◽  
Ldpc Codes ◽  
Ldpc Code ◽  
Coherent Detection ◽  
Heterodyne Detection ◽  
Soft Decision ◽  
Power Requirement ◽  
Received Power ◽  
Forward Error ◽  
Atmospheric Channel

Performance of coherent atmospheric optical communication system with heterodyne detection and LDPC codes was evaluated over atmospheric channel attenuations of which are about 20-30 dB/km. To reduce bit error and enhance the system performance LDPC code was implemented in system. Combining coherent detection and LDPC codes could reduce the received power requirement ~4 dBm at the BER of 10-9.

scholarly journals Error Resilient Coding Techniques for Video Delivery over Vehicular Networks

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3495 ◽  
Author(s):  
Pablo Piñol ◽  
Miguel Martinez-Rach ◽  
Pablo Garrido ◽  
Otoniel Lopez-Granado ◽  
Manuel Malumbres
Keyword(s):  
Error Correction ◽  
Channel Coding ◽  
Vehicular Networks ◽  
Forward Error Correction ◽  
Error Resilience ◽  
Video On Demand ◽  
Video Delivery ◽  
Extensive Evaluation ◽  
Forward Error ◽  
Resilience Capabilities

Nowadays, more and more vehicles are equipped with communication capabilities, not only providing connectivity with onboard devices, but also with off-board communication infrastructures. From road safety (i.e., multimedia e-call) to infotainment (i.e., video on demand services), there are a lot of applications and services that may be deployed in vehicular networks, where video streaming is the key factor. As it is well known, these networks suffer from high interference levels and low available network resources, and it is a great challenge to deploy video delivery applications which provide good quality video services. We focus our work on supplying error resilience capabilities to video streams in order to fight against the high packet loss rates found in vehicular networks. So, we propose the combination of source coding and channel coding techniques. The former ones are applied in the video encoding process by means of intra-refresh coding modes and tile-based frame partitioning techniques. The latter one is based on the use of forward error correction mechanisms in order to recover as many lost packets as possible. We have carried out an extensive evaluation process to measure the error resilience capabilities of both approaches in both (a) a simple packet error probabilistic model, and (b) a realistic vehicular network simulation framework. Results show that forward error correction mechanisms are mandatory to guarantee video delivery with an acceptable quality level , and we highly recommend the use of the proposed mechanisms to increase even more the final video quality.

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