Comparative Analysis of BER Performance for Direct Detection and Coherent Detection FSO Communication Systems

2015 ◽  
Author(s):  
Parmesh Kumar
Keyword(s):  
Comparative Analysis ◽  
Communication Systems ◽  
Direct Detection ◽  
Coherent Detection ◽  
Ber Performance

THE PROGRESS AND PERFORMANCE OF LONG WAVELENGTH OEIC PHOTORECEIVERS INCORPORATING HETEROJUNCTION BIPOLAR TRANSISTORS

1994 ◽  
Vol 05 (01) ◽  
pp. 45-65 ◽  
Author(s):  
S. CHANDRASEKHAR
Keyword(s):  
Integrated Circuits ◽  
Heterojunction Bipolar Transistors ◽  
Communication Systems ◽  
Direct Detection ◽  
Bipolar Transistors ◽  
Coherent Detection ◽  
Future Directions ◽  
Long Wavelength ◽  
Optoelectronic Integrated Circuits ◽  
And Performance

Long wavelength optoelectronic integrated circuits have made impressive progress in the last decade and their performance has become attractive enough to be considered as part of lightwave communication systems. This paper reviews these aspects of OEICs, with emphasis on monolithic photoreceivers which incorporate heterojunction bipolar transistors for electronic functions. We cover applications covering both direct detection as well as coherent detection, discuss implementation methodologies, compare performances with hybrid receivers, briefly look into noise issues, and speculate on future directions.

scholarly journals Accurate Power-Efficient Format-Scalable Multi-Parallel Optical Digital-to-Analogue Conversion

Photonics ◽  
2021 ◽  
Vol 8 (2) ◽  
pp. 38
Author(s):  
Moshe Nazarathy ◽  
Ioannis Tomkos
Keyword(s):  
Energy Efficiency ◽  
Direct Detection ◽  
Coherent Detection ◽  
Performance Limits ◽  
Optical Modulators ◽  
Analog To Digital ◽  
Power Efficient ◽  
Optical Signals ◽  
Digital To Analog Converters ◽  
Optical Analog

In optical transmitters generating multi-level constellations, optical modulators are preceded by Electronic Digital-to-Analog-Converters (eDAC). It is advantageous to use eDAC-free Optical Analog to Digital Converters (oDAC) to directly convert digital bitstreams into multilevel PAM/QAM optical signals. State-of-the-art oDACs are based on Segmented Mach-Zehnder-Modulators (SEMZM) using multiple modulation segments strung along the MZM waveguides to serially accumulate binary-modulated optical phases. Here we aim to assess performance limits of the Serial oDACs (SEMZM) and introduce an alternative improved Multi-Parallel oDAC (MPoDAC) architecture, in particular based on arraying multiple binary-driven MZMs in parallel: Multi-parallel MZM (MPMZM) oDAC. We develop generic methodologies of oDAC specification and optimization encompassing both SEMZM and MPMZM options in Direct-Detection (DD) and Coherent-Detection (COH) implementations. We quantify and compare intrinsic performance limits of the various serial/parallel DD/COH subclasses for general constellation orders, comparing with the scant prior-work on the multi-parallel option. A key finding: COH-MPMZM is the only class synthesizing ‘perfect’ (equi-spaced max-full-scale) constellations while maximizing energy-efficiency-SEMZM/MPMZM for DD are less accurate when maximal energy-efficiency is required. In particular, we introduce multiple variants of PAM4|8 DD and QAM16|64 COH MPMZMs, working out their accuracy vs. energy-efficiency-and-complexity tradeoffs, establishing their format-reconfigurability (format-flexible switching of constellation order and/or DD/COH).

scholarly journals Wireless Chaos-Based Communication System: Literature Review

2021 ◽  
Vol 2 (1) ◽  
pp. 46-54
Author(s):  
Siti Hadiaty Yuningsih ◽  
Sudradjat Supian ◽  
Sukono Sukono ◽  
Subiyanto Subiyanto
Keyword(s):  
Literature Review ◽  
Communication System ◽  
Communication Systems ◽  
Additive Noise ◽  
Poor Performance ◽  
Chaotic Synchronization ◽  
Coherent Detection ◽  
Energy Data ◽  
Chaotic Signals ◽  
Nonlinear Signal

Since the early 1990s, a slew of chaotic-based communication systems have been proposed, all of which take advantage of chaotic waveform properties. The inspiration stems from the substantial benefits that this form of nonlinear signal offers. Many communication schemes and applications have been specifically designed for chaos-based communication systems to achieve this goal, with energy, data rate, and synchronization awareness being taken into account in most designs. However, non-coherent chaos-based systems have recently received a lot of attention in order to take advantage of the benefits of chaotic signals and non-coherent detection while avoiding the use of chaotic synchronization, which has poor performance in the presence of additive noise. This paper provides a thorough examination of all wireless radio frequency chaos-based communication systems. It begins by describing the difficulties of chaos implementations and synchronization processes, then moves on to a thorough literature review and study of chaos-based coherent techniques and their applications.

scholarly journals COMPARATIVE ANALYSIS OF COMPACT METHODS REPRESENTATIONS OF GRAPHIC INFORMATION

2021 ◽  
Vol 1 (37) ◽  
pp. 130-143
Author(s):  
O. Gertsiy
Keyword(s):  
Comparative Analysis ◽  
Communication Systems ◽  
Video Data ◽  
Transport Infrastructure ◽  
Practical Significance ◽  
Jpeg 2000 ◽  
Advantages And Disadvantages ◽  
Graphic Information ◽  
The Cost ◽  
And Storage

The main characteristics of graphic information compression methods with losses and without losses (RLE, LZW, Huffman's method, DEFLATE, JBIG, JPEG, JPEG 2000, Lossless JPEG, fractal and Wawelet) are analyzed in the article. Effective transmission and storage of images in railway communication systems is an important task now. Because large images require large storage resources. This task has become very important in recent years, as the problems of information transmission by telecommunication channels of the transport infrastructure have become urgent. There is also a great need for video conferencing, where the task is to effectively compress video data - because the greater the amount of data, the greater the cost of transmitting information, respectively. Therefore, the use of image compression methods that reduce the file size is the solution to this task. The study highlights the advantages and disadvantages of compression methods. The comparative analysis the basic possibilities of compression methods of graphic information is carried out. The relevance lies in the efficient transfer and storage of graphical information, as big data requires large resources for storage. The practical significance lies in solving the problem of effectively reducing the data size by applying known compression methods.

Non-Coherent Detection for Diffusive Molecular Communication Systems

2018 ◽  
Vol 66 (6) ◽  
pp. 2515-2531 ◽  
Author(s):  
Vahid Jamali ◽  
Nariman Farsad ◽  
Robert Schober ◽  
Andrea Goldsmith
Keyword(s):  
Communication Systems ◽  
Coherent Detection ◽  
Molecular Communication ◽  
Molecular Communication Systems
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