Improve channel signal quality using adaptive filters

A channel can be modelled by trying to calculate the physical processes which modify the transmitted signal. In this article we simulated the adaptive equalization of some communication channels. A system of data transmission in the basic band will be considered in order to illustrate the principle...

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Bibliographic Details
Published in:Scientific Bulletin ("Mircea cel Bătrân" Naval Academy) 2020, Vol.XXIII (1), p.90-96
Main Author: Travediu, Ana-Maria
Format: Article
Language:English
Subjects:
Adaptation
Adaptive filters
Adaptive systems
Bandwidths
Broadband
Channels
Communication
Communication channels
Communications systems
Computer simulation
Data transmission
Distortion
Equalization
Linear filters
Low pass filters
Marconi, Guglielmo (1874-1937)
Sequencing
Signal processing
Signal quality
Tesla, Nikola
Training
Transfer functions
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Summary:A channel can be modelled by trying to calculate the physical processes which modify the transmitted signal. In this article we simulated the adaptive equalization of some communication channels. A system of data transmission in the basic band will be considered in order to illustrate the principle of adaptive equalization. In such a system, the data sequence is applied, upon emission, to a formation filter( low pass filter), with the purpose of limiting the occupied bandwidth. A relatively wide band noise is also introduced on the communication channel. The transmission channel can also be modelled as a linear filter, this is represented by the distortion filter. We used another filter to avoid the distortion introduced by the channel, with the role of equalizer. This should compensate for the distortion introduced by the channel. The channel transfer function is not generally known, and in addition, it may vary slowly over time. Therefore, the need for this filter appears to be adaptive. In order to perform the adaptation initially, a training sequence, known at the reception, can be transmitted first and the output of the filter is compared with a locally generated reference signal, but identical to the one emitted. After this initial adaptation phase, the transmitter transmits the information symbols, the useful signal, thus the application can be used to improve the signal quality of maritime communications channels.
ISSN:2392-8956
1454-864X
1454-864X
2392-8956
DOI:10.21279/1454-864X-20-I1-012