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Doppler shift causes loss of orthogonality in Orthogonal Frequency Division Multiplexing (OFDM), which in turn may severely degrade receiver performance. In high data rate underwater acoustic communication (UAC), the effect of Doppler varies considerably over OFDM subcarriers. This paper will propose an algorithm to estimate the varying effects of Doppler shift over subcarriers and to avoid/mitigate...
This paper introduces a new multicarrier system that uses a low computational complexity transform developed by Boussakta to combine the Walsh-Hadamard Transform (WHT) and Discrete Fourier Transform (DFT) into a single orthogonal transform or as a transition from one transform domain to another. The proposed transform is used in a new orthogonal frequency division multiplexing (T-OFDM) system, across...
Broadband Wireless Access (BWA) is a promising technology which can offer high speed voice, video and internet connection. The leading candidate for BWA is WiMAX, a technology that complies with the IEEE 802.16 family of standards. This paper is focused towards the hardware Implementation of WirelessMAN-OFDM Physical Layer of IEEE Std 802.16d Transmitter on FPGA. The RTL coding style of Verilog HDL...
In this paper, we consider out-of-band radiations caused by high sidelobes in orthogonal frequency division multiplexing (OFDM) system. Suppression of sidelobes in OFDM system allows higher spectral efficiency and less interference with existing legacy systems in OFDM based overlay system. We combine different sidelobe suppression techniques to suppress the sidelobes in OFDM system. The multiple-choice...
Frequency offset and Doppler effect cause loss of orthogonality in orthogonal frequency division multiplexing (OFDM), which in turn may severely degrade receiver performance. Traditionally, most of the literature dealt with non-varying Doppler effect over OFDM subcarriers. However, in terrestrial ultra-wideband (UWB) OFDM radio frequency (RF) and in high data rate underwater acoustic communication...
In a multi-path channel an orthogonal frequency division multiplexing (OFDM) system is very robust to frequency selective fading, but it is sensitive to the time selective fading of the mobile channel. Time selectivity of the channel causes inter-carrier-interference (ICI) in OFDM, thereby degrading the performance significantly and increasing the computational complexity of the receiver. On the other...
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