In this paper we investigate the action of ambient turbulence on thermohaline interleaving using both theory and numerical calculations in combination with observations from Meddy Sharon and the Faroe Front. We improve upon the highly simplified models of ambient turbulence used previously by allowing turbulent diffusivities of momentum, heat and salt to depend on background gradients and to ev...

This paper proposes the interleaving gain in two different distributed turbo-coding schemes: Distributed Turbo Codes (DTC) and Distributed Multiple Turbo Codes (DMTC) for half-duplex relay system as an extension of our previous work on turbo coding interleaver design for direct communication channel. For these schemes with half-duplex constraint, the source node transmits its information with t...

In the past, digital transmission of video and audio has required a broader frequency bandwidth than analog transmission to transmit the same information. Recent progress in source coding technology for video and audio, however, has made it possible to reduce the bit rate while keeping the quality deterioration to a minimum. The frequency bandwidth required for digital transmission has conseque...

Center for Wireless Communications, University of California San Diego, 9500 Gilman Dr. La Jolla, CA 92093-0407, USA – fax: +1-619-534-2486 – e-mail: fzorzi,[email protected] Abstract— The requirements of emerging new communications services differ in many critical ways from traditional voice applications. The effect of errors on voice transmission and techniques to overcome them are relatively...

--In OFDM systems, Fast Fourier transform (FFT) is used for frequency translation, and recently Discrete Wavelet Transform (DWT) has replaced FFT for frequency translation. 16-QAM (Quadrature amplitude modulation) scheme has been used in the OFDM system for both DWT and FFT based models. This work presents a modified OFDM system that is based on a low complexity interleaving process which is ap...

In this work, the design of a -bit (scalar and vector) soft-decision demodulator for Gaussian channels with binary phase-shift keying modulation is investigated. The demodulator is used in conjunction with a soft-decision channel-optimized vector quantization (COVQ) system. The COVQ is constructed for an expanded ( 1) discrete channel consisting of the concatenation of the modulator, the Gaussi...

The key issue of applying Turbo codes is to find an efficient implementation of turbo decoder. This paper addresses the implementation of a simplified and efficient turbo decoder in field programmable gate array (FPGA) technology. A simplified and efficient implementation of a Turbo decoder with minor performance loss has been proposed. An integer Turbo decoder based on the standard 2’s complem...

Transmission By: R. Hoshyar, S. H. Jamali, and A. R. Bahai Dept. of Elect. & Computer Eng., University of Tehran Email: [email protected] and [email protected] Abstract: In transmission of the packets using OFDM (Orthogonal Frequency Division Multiplexing) system recommended by IEEE.802.11 [1] there is a constraint on the interleaving depth due to the maximum allowable packet size and proce...

In this paper, we investigate the costs and benefits of implementing memory interleaving in software. As our main contribution, we compare software memory interleaving to row-major allocation and logarithmic broadcasting. Our analysis demonstrates the clear superiority of software interleaving over row-major allocation in the presence of memory contention. Our analysis also indicates that the c...

Due to high power consumption and other problems, it is unlikely that orthogonal frequency-division multiplexing (OFDM) would be included in the uplink of future 6G standard. High OFDM systems motivated by peak-to-average ratio (PAPR) introduced inverse Fourier transform (IFFT) processing kernel time domain. Linear precoding symbols frequency domain using discrete Hartley (DHT) could used minim...