Differential Coding

2010 ◽  
pp. 135-158
Keyword(s):  
Differential Coding

Differential coding scheme based FSO channel for optical coherent DP-16 QAM transceiver systems

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Shabana Urooj ◽  
Norah Muhammad Alwadai ◽  
Vishal Sorathiya ◽  
Sunil Lavadiya ◽  
Juveriya Parmar ◽  
...  
Keyword(s):  
Simulation Model ◽  
Channel Model ◽  
Optical Signal ◽  
Performance Parameters ◽  
Free Space Optical ◽  
Simulation Performance ◽  
Coding Scheme ◽  
Simulation Results ◽  
Systems Simulation ◽  
Differential Coding

Abstract This article has indicated optical coherent differential polarization (DP) 16 quadrature amplitude modulation (QAM) transceiver systems with free-space optical (FSO) channel in the presence of differential coding scheme. The optical coherent DP 16-QAM receiver executes the reverse process conversion of the optical signal into an electrical one that is detected to the users. The proposed optical coherent DP-16 QAM transceiver systems based FSO channel model with differential coding has been presented and compared with the previous model. However, the simulation results have confidence realization about the superiority of the proposed simulation model. Hence the proposed optical coherent DP-16 QAM transceiver systems simulation model with differential coding is verified and validated the enhancement performance based on simulation performance parameters.

Single and Double-Differential Coding in Cooperative Communications

2010 ◽  
pp. 321-351 ◽  
Author(s):  
Manav R. Bhatnagar ◽  
Are Hjørungnes
Keyword(s):  
Cooperative Communication ◽  
Communication System ◽  
Cooperative Communications ◽  
Base Station ◽  
Amplify And Forward ◽  
Decode And Forward ◽  
Probability Of Error ◽  
Active User ◽  
Downlink Channels ◽  
Differential Coding

In this chapter, we discuss single and double-differential coding for a two-user cooperative communication system. The single-differential coding is important for the cooperative systems as the data at the destination/relaying node can be decoded without knowing the channel gains. The double-differential modulation is useful as it avoids the need of estimating the channel and carrier offsets for the decoding of the data. We explain single-differential coding for a cooperative system with one relay utilizing orthogonal transmissions with respect to the source. Next, we explain two single-differential relaying strategies: active user strategy (AUS) and passive users relaying strategy (PURS), which could be used by the base-station to transmit data of two users over downlink channels in the two-user cooperative communication network with decode-and-forward protocol. The AUS and PURS follow an improved time schedule in order to increase the data rate. A probability of error based approach is also discussed, which can be used to reduce the erroneous relaying of data by the regenerative relay. In addition, we also discuss how to implement double-differential (DD) modulation for decode-and-forward and amplify-and-forward based cooperative communication system with single source-destination pair and a single relay. The DD based systems work very well in the presence of random carrier offsets without any channel and carrier offset knowledge at the receivers, where the single differential cooperative scheme breaks down. It is further shown that optimized power distributions can be used to improve the performance of the DD system.

Experimental Demonstration of Differential Coding Gain for Dual Polarization Two-Eigenvalue Signals

2019 ◽  
Vol 31 (24) ◽  
pp. 1913-1916 ◽  
Author(s):  
Ken Chan ◽  
Alexander Geisler ◽  
Jochen Leibrich ◽  
Christian G. Schaeffer
Keyword(s):  
Experimental Demonstration ◽  
Dual Polarization ◽  
Coding Gain ◽  
Differential Coding

scholarly journals Differential Coding Strategies in Glutamatergic and GABAergic Neurons in the Medial Cerebellar Nucleus

2019 ◽  
Vol 40 (1) ◽  
pp. 159-170 ◽  
Author(s):  
Orçun Orkan Özcan ◽  
Xiaolu Wang ◽  
Francesca Binda ◽  
Kevin Dorgans ◽  
Chris I. De Zeeuw ◽  
...  
Keyword(s):  
Gabaergic Neurons ◽  
Cerebellar Nucleus ◽  
Coding Strategies ◽  
Differential Coding
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