Orthogonal Frequency Division Multiplexing (OFDM) is used to enhance Bit Error Rates (BER) performance for error free transmission in free space in free pace. OFDM-based systems operate in the hostile multipath radio environment, which allows efficient sharing of limited resources. This research work was designed, developed and simulated an FFT-OFDM based System using the basic blocks of Simulink in MATLAB/Simulink software, to enhance BER for error free transmission. The system was design using Fast Fourier transform (FFT) and Inverse Fast Fourier transform (IFFT). This was achieved in backing of collection and review of high-quality research papers, which reported the latest research developments in OFDM communications networks, and its applications in future wireless systems. The research mitigated the noise enhancement effect. And many critical problems associated with the error transmission in wireless communication networks in the future. An error transmission in wireless systems is global issues and challenges that are still looking for efficient solutions. This research work would overcome the global issues and challenges facing the wireless communication network.
A study was carried out to estimate the quantity of total water vapour content of the atmosphere for Sokoto area using solar radiation intensity measurements. Pyronometerwas used to record solar intensities for the month of September, 2012 on daily basis extending from 8.00 hour to 17.00 hour local time. Red and blue plastic filters were used in taking separate measurements of solar intensities in addition to no filter measurements. Total water vapour content was determined using ELSSASER square approximations law. Results indicated that highest value of water vapour content of the atmosphere of 1.458 Kgm-2 was recorded on the 20 th day of the month while the least value of 0.937 Kgm-2 was obtained on the 22 nd day of the month. Average water vapour content for the study area was found to be 1.243 Kgm-2. The procedure involved in this method gives similar result as the conventional methods used for estimating atmospheric water vapour content and the subsequent relative humidity for the study area.
Orthogonal Frequency Division Multiplexing (OFDM) is used to achieve multi-carrier signals and high- Speed data rate in free space. OFDM-based systems operate in the hostile multipath radio environment, which allows efficient sharing of limited resources. This research work was designed, developed and simulated an OFDM System using the basic blocks of Simulink in MATLAB/Simulink software, to support multi-carrier, high-speed data rates. This was achieved in backing of collection and review of high-quality research papers, which reported the latest research developments in OFDM communications networks, and its applications in future wireless systems. The research work significantly increases the speed of data rate signals, and many critical problems associated with the applications of OFDM technologies in future wireless systems are still looking for efficient solutions. This would overcome the global issues and challenges facing the limited bandwidth in wireless communication network.
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