Abstract
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.
Highlights
The need of error free transmission network becomes high due to many issues related to wireless transmission and broadband and multimedia applications in which Orthogonal Frequency Division Multiplexing (OFDM) technologies is the answer to these issues
The simulation results shows that the higher the SNR in the OFDM system, the lower the Bit Error Rates (BER) as can be seen from tables 2, 3 and 4 and figures 8, 9 and 10 below which represent BPSK, QPSK, 8-PSK, 16-PSK and 32-PSK simulation results. 4-QAM, 8-QAM, 16-QAM and 32-QAM simulation results and BPSK, QPSK and QAM simulation results respectively
First the BER performance plots obtained when compared with theory and BER-Tool curve and analyzed the results, the results confirm to be succeeded where by a BER of 0.0010 is achievable at 10 dB SNR using Fast Fourier transform (FFT)-OFDM
Summary
The need of error free transmission network becomes high due to many issues related to wireless transmission and broadband and multimedia applications in which OFDM technologies is the answer to these issues. A summary of major research in significant stages are noted that used of OFDM systems to replace the used of single-carrier modulation techniques are necessary [11]. Other contributions of multi-carrier modulation techniques include the limitations of bandwidth, and the speed of the data rates or power of transmission which need significant increase. OFDM transmit different sub-carriers; between sub-carriers is guard-band to avoid interference that is to eliminate or reduce inter-symbol interference (ISI) and inter-carrier interference (ICI). The sub-carriers are designed to be orthogonal, these allows sub-carriers to overlap and saved Bandwidth, that achieving higher data rate signals and improve BER performance. Http://www.ijetmr.com©International Journal of Engineering Technologies and Management Research [14]
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