M-FSK in Multi Coding and Channel Environments
Fatima Faydhe AL-Azzawi1, Saleim Hachem Farhan2, Maher Ibraheem Gamaj3
1Fatima Faydhe AL-Azawi, Department of Electronic Technique, Institute of Technology, Baghdad, Iraq.
2Saleim Hachem Farhan, Department of Electronic Technique, Institute of Technology, Baghdad, Iraq.
3Maher Ibraheem Gamaj, Department of Electronic Technique, Institute of Technology, Baghdad, Iraq.
Manuscript received on June 18, 2015. | Revised Manuscript received on June 29, 2015. | Manuscript published on July 05, 2015. | PP: 92-96 | Volume-5 Issue-3, July 2015. | Retrieval Number: C2658075315/2015©BEIESP
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©The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/
Abstract: Frequency-shift keying (FSK) is a frequency modulation scheme in which digital information is transmitted through discrete frequency changes of a carrier wave currently used by manufacturers of low power low data rate data transmission equipment. The power efficiency of this modulation increases as the signal alphabet increases at the expense of increased complexity and reduced bandwidth efficiency. Most early telephone-line modems used frequency-shift keying (FSK) to send and receive data at rates up to about 1200 bits per second. In this paper M-FSK have been tested under multi-channel environments AWGN, Rayliegh fading and Risian fading channels in term of BER with coherent and non- coherent demodulation and deferent Size of modulation constellation, Improving techniques used to enhanced the performance of the system under AWGN where convolutional code with hard and soft decision, extended Golay code and Reed-Solomon code, the ratio of energy in the specular component to the energy in the diffuse component (linear scale) and diversity used to improve the performance under Rayliegh and Risian fading channels.
Keywords: M-FSK, FSK with matlab, M-FSK coding, multi-channel.