In Cyclix Prefix OFDM (CP) systems, synchronization to the maximal multipath signal generally causes no problem, however, inter carrier interference (ICI) will be introduced in Zero-padding OFDM (ZP-OFDM) systems, e.g, multiband OFDM UWB (MB-OFDM) systems. In this paper, based on the overlap-and-add (ZP-OFDM-OLA) method typically applied in MB-OFDM, we analyze the cause of the ICI and the perfo...

FAST MULTIPLICATION AND ITS APPLICATIONS DANIEL J. BERNSTEIN Abstra t. This survey explains how some useful arithmeti operations an be sped up from quadrati time to essentially linear time. x2. Produ t: the FFT ase x13. Sum of fra tions x3. Produ t: extension x11. Matrix produ t x14. Fra tion from ontinued fra tion x4. Produ t: zero-padding and lo alization 55 k k k k k k k k k k k k k x12. Pro...

Multiple description coding (MDC) by sequence undersampling can be implemented by preand post-processing, so it can be associated to most standards for image/video communications. Unfortunately, this method suffers from high side distortion when only one description is received. In order to overcome this limitation, over sampling of sequence via zero padding in the DFT domain has been proposed ...

OFDM forms the basis for all the 4G wireless technologies which ensures multi carrier modulation. Fading nature of a wireless channel due to constructive/destructive interference degrades the performance of the system. The spectral efficiency and performance gain can be improved by adapting data rate/modulation schemes. We introduce Adaptive Bit-interleaved coded modulation (ABICM) in OFDM usin...

Fresnel transform implementation methods using numerical preprocessing techniques are investigated in this paper. First, it is shown that up-sampling dramatically reduces the minimum reconstruction distance requirements and allows maximal signal recovery by eliminating aliasing artifacts which typically occur at distances much less than the Rayleigh range of the object. Second, zero-padding is ...

In this paper, we discuss a new method for detecting anchor shots in broadcast news video. Our approach makes use of face information that includes the position, the size and the number of faces detected in the image frame. To alleviate the adverse effects caused by occasional face detection errors, we propose two new ideas based on multiple queries and zero face padding. Our experiments over T...

In this paper, we focus our attention on blind demodulation for multi-carrier modulation in the context of radio surveillance and military applications. We present a blind demodulation technique for CP-OFDM and ZP-OFDM transmission over frequency selective channels. The technique exploits the cyclic prefix or zero padding structure of the transmitted signal to estimate the parameters and to dem...

We propose a modification of the dynamic neural field model of Amari [1], aiming at reducing the simulation effort by employing spaceand frequency representations of the dynamic state in parallel. Additionally, we show how the correct treatment of boundary conditions (wraparound, zero-padding) can be ensured, which is of particular importance for, e.g., vision processing. We present theoretical...

Convolutions are used in data and image analysis and form the crux of the pseudospectral method for direct numerical simulations of fluids. Their calculation is a computationally expensive task that is facilitated by the use of FFTs at the expense of increased memory, which is required for the removal of aliased terms. Here, we present a multithreaded version of the method of implicit dealiasin...

OFDM (Orthogonal Frequency Division Multiplexing) system is the high bandwidth efficient technique mainly used for high data transmission over the multipath fading environment. The major challenges faced by OFDM/OFDMA systems are sensitivity to frequency selective fading and ICI due to Doppler shift and CFO when subcarrier spacing becomes smaller. So we implement the zero padded conjugate techn...