New Adaptive Data Transmission Scheme Over HF Radio

Acceptable Bit Error rate can be maintained by adapting some of the design parameters such as modulation, symbol rate, constellation size, and transmit power according to the channel state. An estimate of HF propagation effects can be used to design an adaptive data transmission system over HF l...

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Autores principales:	Khalifa Abboud Salim, Abdul-Karim A. R. Kadhim, Adil H. Ahmad
Formato:	article
Lenguaje:	EN
Publicado:	Al-Khwarizmi College of Engineering – University of Baghdad 2008
Materias:	Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/c132ca6d660440aa9407a2de420ea027
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spelling	oai:doaj.org-article:c132ca6d660440aa9407a2de420ea0272021-12-02T05:43:35ZNew Adaptive Data Transmission Scheme Over HF Radio1818-11712312-0789https://doaj.org/article/c132ca6d660440aa9407a2de420ea0272008-09-01T00:00:00Zhttp://alkej.uobaghdad.edu.iq/index.php/alkej/article/view/590https://doaj.org/toc/1818-1171https://doaj.org/toc/2312-0789 Acceptable Bit Error rate can be maintained by adapting some of the design parameters such as modulation, symbol rate, constellation size, and transmit power according to the channel state. An estimate of HF propagation effects can be used to design an adaptive data transmission system over HF link. The proposed system combines the well known Automatic Link Establishment (ALE) together with variable rate transmission system. The standard ALE is modified to suite the required goal of selecting the best carrier frequency (channel) for a given transmission. This is based on measuring SINAD (Signal plus Noise plus Distortion to Noise plus Distortion), RSL (Received Signal Level), multipath phase distortion and BER (Bit Error Rate) for each channel in the frequency list. Channel condition evaluation is done by two arrangements. In the first an FFT analysis is used where a pilot signal is transmitted over the channel, while the data itself is used in the second arrangement. Passive channel assessment is used to avoid bad channels hence limiting the frequency pool size to be used in the point to point communication and the time required for scanning and linking. An exchange of channel information between the transmitting and receiving stations is considered to select the modulation scheme for transmission. Mainly MPSK and MFSK are considered with different levels giving different data rate according to the channel condition. The results of the computer simulation have shown that when transmitting at a fixed channel symbol rate of 1200 symbol/sec, the information rate ranges from 2400 bps using 4FSK up to 3600 bps using 8PSK for SNR ranges from 11dB up to 26dB. Khalifa Abboud SalimAbdul-Karim A. R. KadhimAdil H. AhmadAl-Khwarizmi College of Engineering – University of BaghdadarticleChemical engineeringTP155-156Engineering (General). Civil engineering (General)TA1-2040ENAl-Khawarizmi Engineering Journal, Vol 4, Iss 3 (2008)
institution	DOAJ
collection	DOAJ
language	EN
topic	Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040 Khalifa Abboud Salim Abdul-Karim A. R. Kadhim Adil H. Ahmad New Adaptive Data Transmission Scheme Over HF Radio
description	Acceptable Bit Error rate can be maintained by adapting some of the design parameters such as modulation, symbol rate, constellation size, and transmit power according to the channel state. An estimate of HF propagation effects can be used to design an adaptive data transmission system over HF link. The proposed system combines the well known Automatic Link Establishment (ALE) together with variable rate transmission system. The standard ALE is modified to suite the required goal of selecting the best carrier frequency (channel) for a given transmission. This is based on measuring SINAD (Signal plus Noise plus Distortion to Noise plus Distortion), RSL (Received Signal Level), multipath phase distortion and BER (Bit Error Rate) for each channel in the frequency list. Channel condition evaluation is done by two arrangements. In the first an FFT analysis is used where a pilot signal is transmitted over the channel, while the data itself is used in the second arrangement. Passive channel assessment is used to avoid bad channels hence limiting the frequency pool size to be used in the point to point communication and the time required for scanning and linking. An exchange of channel information between the transmitting and receiving stations is considered to select the modulation scheme for transmission. Mainly MPSK and MFSK are considered with different levels giving different data rate according to the channel condition. The results of the computer simulation have shown that when transmitting at a fixed channel symbol rate of 1200 symbol/sec, the information rate ranges from 2400 bps using 4FSK up to 3600 bps using 8PSK for SNR ranges from 11dB up to 26dB.
format	article
author	Khalifa Abboud Salim Abdul-Karim A. R. Kadhim Adil H. Ahmad
author_facet	Khalifa Abboud Salim Abdul-Karim A. R. Kadhim Adil H. Ahmad
author_sort	Khalifa Abboud Salim
title	New Adaptive Data Transmission Scheme Over HF Radio
title_short	New Adaptive Data Transmission Scheme Over HF Radio
title_full	New Adaptive Data Transmission Scheme Over HF Radio
title_fullStr	New Adaptive Data Transmission Scheme Over HF Radio
title_full_unstemmed	New Adaptive Data Transmission Scheme Over HF Radio
title_sort	new adaptive data transmission scheme over hf radio
publisher	Al-Khwarizmi College of Engineering – University of Baghdad
publishDate	2008
url	https://doaj.org/article/c132ca6d660440aa9407a2de420ea027
work_keys_str_mv	AT khalifaabboudsalim newadaptivedatatransmissionschemeoverhfradio AT abdulkarimarkadhim newadaptivedatatransmissionschemeoverhfradio AT adilhahmad newadaptivedatatransmissionschemeoverhfradio
_version_	1718400256127795200

New Adaptive Data Transmission Scheme Over HF Radio

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