The Constraints Satisfied to Suppress the Interferences Caused by MB-OFDM UWB Based Cognitive Radio Systems; One Type of Low Density Parity Check(LDPC)-like Modulation Scheme

2008 ◽  
Author(s):  
Cheng Yang ◽  
Zheng Zhou ◽  
Yabin Ye
Keyword(s):  
Cognitive Radio ◽  
Modulation Scheme ◽  
Low Density ◽  
Parity Check ◽  
Low Density Parity Check ◽  
Cognitive Radio Systems ◽  
Radio Systems

scholarly journals LDPC-Coded CAP with Spatial Diversity for UVLC Systems over Generalized-Gamma Fading Channel

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3378
Author(s):  
Hongyan Jiang ◽  
Hongbing Qiu ◽  
Ning He ◽  
Zhonghua Zhao ◽  
Wasiu Popoola ◽  
...  
Keyword(s):  
Characteristic Function ◽  
Bit Error Rate ◽  
Fading Channel ◽  
Visible Light Communication ◽  
Spatial Diversity ◽  
Modulation Scheme ◽  
Low Density ◽  
Parity Check ◽  
Generalized Gamma ◽  
Low Density Parity Check

In this paper, low-density parity-check (LDPC)-coded carrierless amplitude and phase (CAP) modulation with spatial diversity is proposed to mitigate turbulence-induced fading in an underwater visible-light communication (UVLC) channel. Generalized-gamma (GG) distribution was used to model the fading, as this model is valid for weak- and strong-turbulence regimes. On the basis of the characteristic function (CHF) of GG random variables, we derived an approximated bit-error rate (BER) for the CAP modulation scheme with spatial diversity and equal-gain combining (EGC). Furthermore, we simulated the performance of the CAP system with diversity and LDPC for various turbulence conditions and validated the analysis. Obtained results showed that the combination of LDPC and spatial diversity is effective in mitigating turbulence-induced fading, especially when turbulence strength is strong.

Achievable Capacity of Closed/Open-Access Cognitive Radio Systems Coexisting with a Macro Cellular Systems

2012 ◽  
Vol E95-B (4) ◽  
pp. 1190-1197
Author(s):  
Hiromasa FUJII ◽  
Hiroki HARADA ◽  
Shunji MIURA ◽  
Hidetoshi KAYAMA
Keyword(s):  
Cognitive Radio ◽  
Open Access ◽  
Cellular Systems ◽  
Cognitive Radio Systems ◽  
Radio Systems ◽  
Macro Cellular

New rapid algorithm for detecting girth of low-density Parity-check codes

2013 ◽  
Vol 32 (11) ◽  
pp. 3100-3101
Author(s):  
Jiong-cheng LI ◽  
Gui-yu LI ◽  
Heng-hui XIAO ◽  
Hai-yi HUANG
Keyword(s):  
Low Density ◽  
Parity Check ◽  
Low Density Parity Check ◽  
Parity Check Codes
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