Tariq Jamil Saifullah Khanzada

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Single carrier transmission (SCT) is a competing technique for orthogonal frequency division multiplexing (OFDM) in broadband wireless systems (BWS). Recent developments in frequency domain equalization (FDE) using decision feedback equalization (DFE) have greatly improved the system based on the single carrier (SC) technique. This paper presents the(More)
The orthogonality between the sub-carriers of orthogonal frequency division multiplexing (OFDM) systems is lost in case of time-variant channels, and thus, the system performance is degraded because of the resulting inter-carrier interference (ICI) phenomenon. In such case, a complete estimation of the channel matrix is required to cancel the effect of ICI.(More)
One of the orthogonal frequency division multiplexing (OFDM) system disadvantages is its sensitivity to frequency offset and phase noise, which lead to losing the orthogonality between the subcarriers and thereby degrade the system performance. In this paper a joint scheme for frequency offset and pilot-based channel estimation is introduced in which the(More)
Symbol length is an important factor that can affect the spectrum efficiency and the performance of Orthogonal Frequency Division Multiplexing OFDM system. However, the symbol length is usually fixed in conventional OFDM systems, which decreases the spectrum efficiency considerably, especially in a mobile environment. This paper introduces an adaptive OFDM(More)
This paper presents the utilization of super resolution algorithms for the indoor positioning applications in order to estimate Time Difference of Arrival (TDOA) and distances using Orthogonal Frequency Division Multiplexing (OFDM) transceiver. Optimal reduction in Distance Measurement Error (DME) is achieved. We have utilized OFDM/Single Carrier-Decision(More)
User authentication through textual passwords is very common in computer systems due to its ease of use. However textual passwords are vulnerable to different kinds of security attacks, such as spyware and dictionary attacks. In order to overcome the deficiencies of textual password scheme, many graphical password schemes have been proposed. The proposed(More)
This paper introduces an adaptive time interpolator for orthogonal frequency division multiplexing (OFDM) systems in time-variant channels. The off-diagonals of the channel matrix, which represent the inter-carrier interference (ICI) coefficients, are estimated by approximating the channel over few successive symbols making use of Taylor and Lagrange(More)
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