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In this paper, we examine an enhancement of pulsed Multiband Orthogonal Frequency Division Multiplexing (pulsed MB-OFDM) systems for Synthetic Aperture Radar (SAR) Ultra-Wide Band (UWB) applications. The pulsed MB-OFDM system offers an efficient option for fulfilling the UWB high bandwidth channel requirements. This system combines the two major implementations of UWB, namely the impulse radio and...
Optical Orthogonal Frequency Division Multiplexing (O-OFDM) provides major advantages in mitigating Group-Velocity Dispersion (GVD) in Single-Mode Fiber (SMF). Unfortunately, substantial dispersion is accumulated in long-haul transmission, leading to a longer Cyclic Prefix (CP). This effect sets some limitations on the overall throughput and the spectral efficiency. On the other hand, if the CP length...
The Performance of Orthogonal Frequency Division Multiplexing (OFDM) combined with Quadrature Amplitude Modulation (QAM) has been analyzed in presence of fiber optic dispersion. The influence of dispersion on the (OFDM) spectrum is investigated with fiber lengths, bit rates, no. of channels and source line widths. The inter-channel interference occurs due to dispersion-induced broadening of OFDM spectrum...
OFDMA is the preferred multiple access technique to provide high data rate services in mobile environment due its resilience against multipath propagation impairment and flexibility to provide multi-rate data services. However, it also has issue with susceptibility to ICI (inter-carrier interference) caused by frequency offset and Doppler spread due to mobility. Thus, OFDMA with certain number of...
Orthogonal Frequency Division Multiplexing (OFDM) is predicted to be implemented in future broadcasting and Wireless Local Area Network (WLAN) systems due to its robustness in transmitting a high data rate. Some examples of current applications using OFDM include ETSI BRAN in Europe, IEEE802.11 in United States, and ARIB MMAC in Japan have adopted the OFDM transmission technology as a physical layer...
A new approach of an optimal 16-QAM modulation has been introduced to be used for both Fourier and wavelet based OFDM. The comparison between circular and square 16-QAM is included. It is shown that the power consumption of circular is better than the square by 0.5359 W or -2.71 dB for the same minimum distance 2d. Simulation works for Fourier and wavelet based OFDM have been performed. In Fourier...
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