International Journal of Engineering Research

Sawadogo Moumouni ¹, Zougmore Francois ¹, Doumounia Ali ¹, Sanou Serge Roland ¹, Kebre B. Marcel ¹

Affiliations
1 Laboratoire de Materiaux et Environnement (LAME), UFR-SEA, Universite Ouaga 1 Pr Joseph Ki-Zerbo, Ouagadougou, BF

Abstract

This paper presents an optimization methodology for fixed service microwave link. To obtain high throughput on the microwave link, the possibility to use wideband channel and low modulation or the reverse are possible. We present a methodology to obtain high speed and best performance for microwave links based on modulation and frequency channel choice. In the first time we present a microwave design parameters, the performances of an Additive White Gaussian Noise channel (AWGN) and we propose a methodology for the ITU-RF adjacent channels arrangement optimization to obtain a high speed transmission with a best fade margin (99.9998% of annual availability) . In the second time, we present an experimental design using a microwave link design tool and measurements on physical link.

Keywords

Optimization, Frequency, Performance, Microwave, High Speed.

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Sanou Serge Roland ¹, Zougmore Francois ¹, Kebre Marcel ¹, Koalaga Zacharie ¹, Doumounia Ali ¹

Affiliations
1 Laboratoire de Materiaux et Environnement (LAME), UFR-SEA, Universite de Ouagadougou, Ouagadougou, BF

Abstract

This paper presents a comparison of the performances of coded OFDM (Orthogonal Frequency Division Multiplexing) for optical broadband transmission using Random Neural Network (RNN), a variant of RNN, Soft Decision Decoding (SDD) and LDPC channel decoding techniques. The performance evaluation is based firstly on the Error Vector Magnitude (EVM) to assess the effects of imperfections in the optical channel, and secondly on the estimated Bit Error Rate (BER) based on OSNR. The simulations are performed at a rate of 10Gb/s over 1000 km using VPI software co-simulation environment. The results show that the error correcting codes, particularly LDPC codes, are well suited and efficient for broadband.These codes provide satisfactory solutions for OFDM, reducing the effects of chromatic dispersion (CD), polarization mode dispersion (PMD), Intersymbol Interference(ISI) and non-linearities.

Keywords

OFDM, BER, EVM, Optical Fiber, Decoder, Neural Network, SDD, LDPC, Broadband.

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