Error Correction Based on LDPC Codes in Wireless Optical Communication

2013 ◽  
Vol 380-384 ◽  
pp. 3811-3814
Author(s):  
Xiao Rong Gao ◽  
Pei Wang ◽  
Jian Qiang Guo ◽  
Jin Long Li ◽  
Kai Yang ◽  
...  
Keyword(s):  
Error Correction ◽  
Optical Communication ◽  
Error Rate ◽  
Error Control ◽  
Channel Model ◽  
Ldpc Codes ◽  
Atmospheric Environment ◽  
Atmospheric Scattering ◽  
Wireless Optical Communication ◽  
Beam Expander

Complex atmospheric environment seriously affect the quality of wireless of information transmission. In order to improve the wireless optical communication quality, and reduce the influence of attenuation, flicker, angle misalignment caused by atmospheric scattering, absorption, turbulence, beam expander, mismatch, atmospheric channel model is established while coding techniques for error control in wireless optical communication was researched into.The improvement result of error rate by error correction coding in different SNR situations was obtained. The results showed that the LDPC coding can significantly reduce the BER. For Gaussian channel, SNR can be reduced 8 dB when BER is 10-6; For wireless optical communication , LDPC codes can make the error rate reduced by 4-5 orders of magnitude.

Hamming Product Code Based Multiple Bit Error Correction Coding Scheme Using Keyboard Scan Based Decoding for on Chip Interconnects Links

2012 ◽  
Vol 241-244 ◽  
pp. 2457-2461 ◽  
Author(s):  
Murali Maheswari ◽  
Gopalakrishnan Seetharaman
Keyword(s):  
Error Correction ◽  
Error Rate ◽  
Iterative Decoding ◽  
Error Control ◽  
Low Complexity ◽  
Hardware Complexity ◽  
Error Correction Coding ◽  
Product Code ◽  
Coding Scheme ◽  
On Chip

In this paper, we present multiple bit error correction coding scheme using extended Hamming product code combined with type II HARQ and keyboard scan based error flipping to correct multiple bit errors for on chip interconnect. The keyboard scan based error flipping reduces the hardware complexity of the decoder compared to the existing three stages iterative decoding method for on chip interconnects. The proposed method of decoding achieves 86% of reduction in area and 23% of reduction in decoder delay with only small increase in residual flit error rate compared to the existing three stage iterative decoding scheme for multiple bit error correction. The proposed code also achieves excellent improvement in residual flit error rate and up to 66% of links power consumption compared to the other error control schemes. The low complexity and excellent residual flit error rate make the proposed code suitable for on chip interconnection links.

scholarly journals Effect of Receiver’s Tilted Angle on the Capacity for Underwater Wireless Optical Communication

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2072
Author(s):  
Meiyan Ju ◽  
Ping Huang ◽  
Yueheng Li ◽  
Hongqiang Shi
Keyword(s):  
Optical Communication ◽  
Channel Model ◽  
Ocean Water ◽  
Pointing Error ◽  
Tilted Angle ◽  
Wireless Optical Communication ◽  
Double Exponential ◽  
Capacity Bounds ◽  
Receiver Plane ◽  
Close Form

This paper focuses on the effect of the receiver’s tilted angle on the capacity of a clear ocean water Underwater Wireless Optical Communication (UWOC) system. To achieve this goal, the relationship between the channel capacity and the receiver’s tilted angle is investigated. First, we propose a double-exponential fading model with pointing error which can more accurately depict the channel of clear ocean water UWOC instead of the traditional Beer’s law model. Based on this channel model, we present the close-form expression of the capacity bounds of the UWOC system. Then, an optimization problem is formulated to improve the capacity by tilting the receiving plane. Both theoretical analyses and simulation results verify that the capacity bounds of UWOC can be enhanced dramatically by tilting the receiver plane at an optimal angle. Thus, in practice, we can provide an effective design strategy for a UWOC system.

scholarly journals Unified Statistical Channel Model for Turbulence-Induced Fading in Underwater Wireless Optical Communication Systems

2019 ◽  
Vol 67 (4) ◽  
pp. 2893-2907 ◽  
Author(s):  
Emna Zedini ◽  
Hassan Makine Oubei ◽  
Abla Kammoun ◽  
Mounir Hamdi ◽  
Boon S. Ooi ◽  
...  
Keyword(s):  
Optical Communication ◽  
Communication Systems ◽  
Channel Model ◽  
Wireless Optical Communication ◽  
Optical Communication Systems
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