Decentralized control across bit-limited communication channels: an example

2005 ◽  
Author(s):  
Ling Shi ◽  
Chih-Kai Ko ◽  
Zhipu Jin ◽  
D. Gayme ◽  
V. Gupta ◽  
...  
Keyword(s):  
Decentralized Control ◽  
Communication Channels ◽  
Limited Communication

scholarly journals OPTIMIZATION OF THE STRUCTURE OF A MULTI-FREQUENCY MODEM

T-Comm ◽  
2021 ◽  
Vol 15 (6) ◽  
pp. 10-19
Author(s):  
Andrey V. Alyoshintsev ◽  
Keyword(s):  
Energy Efficiency ◽  
Spectral Efficiency ◽  
Data Transmission ◽  
High Speed ◽  
Communication Channels ◽  
Digital Transmission ◽  
Transmission System ◽  
Limited Communication ◽  
High Speed Data ◽  
Speed Data Transmission

The paper considers the solution to the problem of increasing the spectral efficiency of a digital transmission system with multifrequency modulation and optimal finite signals that do not cause intersymbol interference in various channels of a multifrequency modem. Applying the method of multi-frequency data transmission based on two-dimensional signal processing, high-speed data transmission is organized over frequency-limited communication channels based on wired technologies of the xDSL standard. The well-known and new modem, which is superior in efficiency to similar modems, are presented. In this paper, the modernization of a multifrequency modem with optimal finite signals based on quadrature amplitude modulation (QAM) is considered. The peculiarity of this structure is as follows: the use of new, synthesized optimal finite OFS-2 signals with increased noise immunity; in the application of the new structure of the multi-frequency modem MFM3; in the use of a frequency-limited GCS in the UEP DCS at the reception in order to compensate for the amplitude and phase distortions introduced by it. Comparative results of calculations of the spectral-energy efficiency of the considered multi-frequency modulated modem MFM3 with OFS-2 and narrow-band subcarriers are illustrated by the graphs in Fig. and presented in Table . Implementation of the new modem in digital telecommunications systems will significantly increase their spectral efficiency. The proposed approach can be used to organize high-speed data transmission over frequency-limited communication channels based on wired technologies of the xDSL standard. For the first time, an adaptive multi-channel digital transmission system with a new multi-frequency modem and new optimal second-type finite signals with increased spectral and energy efficiency has been developed, taking into account optimal estimates of the parameters of the direct communication channel transmitted via the feedback channel and used both in transmission (in the modulator) and reception (in the demodulator).

Decentralized Control of Satellite Clusters Under Limited Communication

2006 ◽  
Vol 29 (1) ◽  
pp. 134-145 ◽  
Author(s):  
Gene M. Belanger ◽  
Slava Ananyev ◽  
Jason L. Speyer ◽  
David F. Chichka ◽  
J. Russell Carpenter
Keyword(s):  
Decentralized Control ◽  
Limited Communication ◽  
Satellite Clusters
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