scholarly journals Dispersion Tolerance of 40 Gbaud Multilevel Modulation Formats with up to 3 bits per Symbol

2006 ◽  
Author(s):  
Jesper Bevensee Jensen ◽  
Torger Tokle ◽  
Yan Geng ◽  
Palle Jeppesen ◽  
Murat Serbay ◽  
...  
Keyword(s):  
Modulation Formats ◽  
Multilevel Modulation ◽  
Dispersion Tolerance

BER estimation for multilevel modulation formats

2009 ◽  
Author(s):  
Hadrien Louchet ◽  
Konstantin Kuzmin ◽  
Igor Koltchanov ◽  
André Richter
Keyword(s):  
Modulation Formats ◽  
Multilevel Modulation

Performance evaluation of multilevel modulation formats using partial response for capacity upgrade in access network with limited electronic bandwidth

2016 ◽  
Vol 31 ◽  
pp. 168-171 ◽  
Author(s):  
Peter Madsen ◽  
Lau Frejstrup Suhr ◽  
Juan Sebastian Rodriguez ◽  
Idelfonso Tafur Monroy ◽  
Juan José Vegas Olmos
Keyword(s):  
Performance Evaluation ◽  
Partial Response ◽  
Access Network ◽  
Modulation Formats ◽  
Multilevel Modulation

scholarly journals Generation of 100+++ Gbit/s signals using multilevel modulation formats

2007 ◽  
Author(s):  
Torger Tokle ◽  
Murat Serbay ◽  
Jesper Bevensee Jensen ◽  
Werner Rosenkranz ◽  
Palle Jeppesen
Keyword(s):  
Modulation Formats ◽  
Multilevel Modulation

scholarly journals High-order UWB pulses scheme to generate multilevel modulation formats based on incoherent optical sources

2013 ◽  
Vol 21 (23) ◽  
pp. 28914 ◽  
Author(s):  
Mario Bolea ◽  
José Mora ◽  
Beatriz Ortega ◽  
José Capmany
Keyword(s):  
High Order ◽  
Modulation Formats ◽  
Multilevel Modulation

scholarly journals Improving the performance of BICM-ID and MLC systems with different FEC codes

2013 ◽  
Vol 11 ◽  
pp. 87-93 ◽  
Author(s):  
T. Arafa ◽  
W. Sauer-Greff ◽  
R. Urbansky
Keyword(s):  
Turbo Codes ◽  
Channel Coding ◽  
Communication Systems ◽  
Forward Error Correction ◽  
Convolutional Codes ◽  
Coded Modulation ◽  
Modulation Formats ◽  
Coding Schemes ◽  
Multilevel Modulation ◽  
Exit Charts

Abstract. In bandwidth limited communication systems, the high data rate transmission with performance close to capacity limits is achieved by applying multilevel modulation schemes in association with powerful forward error correction (FEC) coding, i.e. coded modulation systems. The most important practical approaches to coded modulation systems are multilevel coding with multistage decoding (MLC/MSD) and bit interleaved coded modulation with iterative demapping and decoding (BICM-ID). Multilevel modulation formats such as M-QAM, which can be used as a part of coded modulation systems, have the capability of multilevel protection. Based on this fact, we investigate the methods to improve the performance of BICM-ID using multiple interleavers with different binary channel coding schemes such as convolutional codes, turbo codes and low-density parity-check (LDPC) codes. Moreover, an MLC system with parallel decoding on levels (PDL) at the receiver is considered. In our contribution, we propose to design the individual coding schemes using the extrinsic information transfer (EXIT) charts for individual bit levels in the constellation. Our simulation results show that the BICM-ID systems, taking into account different bit-level protections, can provide an improvement of 0.65 dB, 1.2 dB and 1.5 dB for 256-QAM with turbo, LDPC and convolutional codes, respectively. On the other hand, MLC systems with PDL designed using EXIT charts for individual bit levels can slightly improve the performance and eliminate the error floor compared to the systems with MSD.

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