We propose frequency-domain interleaver for discrete Fourier transform spread orthogonal division multiplexing (DFT-s-OFDM) based on a linear-or quadratic permutation polynomial (LPP/QPP). Interleaving the coefficients (i.e., DFT precoder output) implies that modulation symbols become transmitted over both time-and frequency domain, which is beneficial time-frequency selective channels. Despite...

111 www.ijeas.org  Abstract— This work is focused to carry out investigation of WDM Free Space Optical transmission when even and odd channels are orthogonally polarized. In this work 8 independent channels each having capacity of 1.56Gbps are transmitted over free space optical link of 15 kilometer at different beam divergence angles. Systems with and without polarization interleaving are com...

BACKGROUND Digital watermarking is a technique of hiding specific identification data for copyright authentication. This technique is adapted here for interleaving patient information with medical images, to reduce storage and transmission overheads. METHODS The patient information is encrypted before interleaving with images to ensure greater security. The bio-signals are compressed and subs...

The space-time bit-interleaved coded modulation (ST-BICM) is an efficient technique to obtain high diversity and coding gain on a block-fading MIMO channel. Its maximum-likelihood (ML) performance is computed under ideal interleaving conditions, which enables a global optimization taking into account channel coding. Thanks to a diversity upperbound derived from the Singleton bound, an appropria...

—In this paper, MIMO (Multiple-Input-Multiple Output) system based on turbo equalization techniques which LDPC (Low Density Parity Check) codes were outer code and STTC (Space Time Trellis Code) were employed as an inner code are studied. LDPC decoder and STTC decoder are connected through the interleaving and de-interleaving that updates each other's information repeatedly. On the receiver si...

A novel turbo equalization arrangement is proposed, which is constituted by a serially concatenated systematic convolutional codec and a systematic space time trellis code (CC-SSTTC) assisted scheme. The BER performance of this scheme using various interleaving sizes was characterised over an equal-power twopath Rayleigh fading channel. After eight turbo equalization iterations, an interleaving...

Interleaver design for bit-interleaved coded modulation in highly bandwidth-efficient transmission is investigated. Based on an equivalent channel model with parallel binary input channels, the variation of the so-called bit level capacities is identified as an additional source of “fading” that has to be taken into account for interleaver design. We assess the more appropriate approach of intr...

This paper presents a half-selected robust 12T bitcell with built-in write-assist for sub-threshold SRAM. The proposed is enough in bit-interleaving architecture to enhance soft-error immunity combined error correction code. read stability of the improved by decoupled. writability data-dependent supply-cutoff write-assist. Both row and column f-selected bitcells can hold data stably during writ...

Superdense coding promises increased classical capacity and communication security but this advantage may be undermined by noise in the quantum channel. We present a numerical study of how forward error correction (FEC) applied to the encoded classical message can be used to mitigate against quantum channel noise. By studying the bit error rate under different FEC codes, we identify the unique ...

The performance analysis of a system employing co-ordinate interleaving and constellation rotation, over Nakagami-m fading channels, in the presence of phase noise as well as additive white Gaussian noise, is presented. An upper bound for the average probability of bit error for M-ary phase shift keying is derived. It is shown that the derived upper bound is tight for high signal-to-noise ratio...