It has been recognized by Zehavi (1992) that the performance of coded modulation over a Rayleigh fading channel can be improved bit-wise interleaving at encoder output, and using an appropriate soft-decision metric as input to Viterbi (1990) decoder. The paper presents in comprehensive fashion theory underlying bit-interleaved modulation, provides tools for evaluating its performance, gives guidelines design.

It has been shown by Zehavi (1992) that the performance of coded modulation with a Rayleigh fading channel can be improved bit-wise interleaving at encoder output, and using an appropriate soft-decision metric as input to Viterbi decoder. In this paper we present unified theory bit-interleaved modulation, provide tools for analysis give guidelines its design.

In this paper we review the most peculiar and interesting information-theoretic communications features of fading channels. We first describe statistical models channels which are frequently used in analysis design communication systems. Next, focus on information theory channels, by emphasizing capacity as important performance measure. Both single-user multiuser transmission examined. Further, how structure impacts code design, finally overview equalization multipath

We study optimal constant-rate coding schemes for a block-fading channel with strict transmission delay constraint, under the assumption that both transmitter and receiver have perfect channel-state information. show information outage probability is minimized by concatenating standard "Gaussian" code an power controller, which allocates transmitted dynamically to symbols. solve minimum problem different constraints on we derive corresponding power-allocation strategies. In addition, propose...

In this paper, we model M × N orthogonal time frequency space modulation (OTFS) over a P-path doubly dispersive channel with delays less than τ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">max</sub> and Doppler shifts in the range (ν xmlns:xlink="http://www.w3.org/1999/xlink">min</sub> ,ν ). We first derive simple matrix form input-output relation delay-Doppler domain for practical (e.g., rectangular) pulse-shaping waveforms, next generalize...

We derive the performance limits of a radio system consisting transmitter with t antennas and receiver r antennas, block-fading channel additive white Gaussian noise (AWGN), delay transmit-power constraints, perfect channel-state information available at both receiver. Because constraint, transmission codeword is assumed to span finite (and typically small) number M independent realizations; therefore, relevant are outage probability "delay-limited" (or "nonergodic") capacity. coding scheme...

Conventional techniques attempting to compensate for the influence of linear and nonlinear distortion in digital satellite channels include optimization channel filtering. With conventional filtering it has been experienced that there is still room considerable improvement, so appears reasonable investigate some forms an attempt cope with those distortions. In this paper a equalizer structure proposed, its performance analyzed. It shown, by examples Of application 4-phase PSK channel, can...

An analytical solution to the problem of modeling bandpass nonlinear channels and evaluating performance digital communication systems operating on them is presented. A method based a Volterra series representation overall channel first proposed, which allows one extend nonlinearities with memory well-known concepts complex envelope signals low-pass equivalent linear systems. The general results previously mentioned are then applied satellite over channels. effect amplifier located in...

Designing a system able to cope with hostile channel is typical challenge for data communication engineers. High-data-rate over power lines an exemplar case: while are potentially convenient and inexpensive "no new wire" medium transmission, their features make it very difficult design simple modem. In this article we illustrate the main of line channel, some solutions advocated modem design.

Under the assumption of a frequency-flat slow Rayleigh fading channel with multiple transmit and receive antennas, we examine effects imperfect estimation parameters on error probability when known pilot symbols are transmitted among information data. Three different receivers considered. The first one derives an estimate [by using either maximum-likelihood (ML) or minimum mean square (MMSE) criterion], then uses this in same metric that would be applied if were perfectly known. second...

We focus on full-rate, fast-decodable space-time block codes (STBCs) for 2 times and 4times2 multiple-input multiple-output (MIMO) transmission. first derive conditions design criteria reduced-complexity maximum-likelihood (ML) decodable 2times2 STBCs, we apply them to two families of that were recently discovered. Next, a novel STBC, show it outperforms all previously known with certain constellations.

Two related cancellation techniques based on "tentative" decisions are proposed for removing intersymbol interference, due to channel nonlinearities, voiceband data transmission. Cancellation of interference avoids the need equalizing or "inverting" analog nonlinear operations as in decision-feedback method previously by Falconer. The approach removes terms without excessive noise enhancement and allows effective implementation with ROM's generate needed signal variables that be weighted...

Currently, 4-PSK is the prevalent modulation format in use for digital satellite communications. To improve bandwidth efficiency, 8PSK could be used instead, but a higher power would needed; to error-correcting codes used, at expense of larger bandwidth. Recently, Ungerboeck [1] has proposed class which constellation <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2M</tex> signals transmit information rate...

Fairness in non-orthogonal multiple access (NOMA) may be defined different ways, taking into account the physical layer alone or also including process of radio resource management. The latter has been frequently used recent literature, implying a significant advantage this technique compared with conventional orthogonal (OMA). In letter, we look at fairness issue from another angle and introduce fundamental definition fairness, which measures difference between rates that can achieved by...

Orthogonal time frequency space (OTFS) modulation, which encodes information symbols in the delay-Doppler domain, offers a promising solution to problem of high Doppler sensitivity orthogonal division multiplexing (OFDM) transmission. In this letter we study diversity OTFS assuming rectangular waveforms and channel with two paths. After introducing concept effective (ED), argue be more significant than "standard" case large number transmitted symbols, examine conditions under achieves full...

Soluble factors and cell-derived extracellular vesicles (EVs) are crucial tissue repair mediators in cell-based therapy. In the present study, we investigate therapeutic impact of EVs released by adipose tissue-derived stem cells (ASCs) recovered from obese subjects' visceral subcutaneous tissues. ASCs were 10 (oASCs) 6 non-obese (nASCs) participants characterized. selected experiments, nASCs oASCs cultured with palmitic acid (PA) or high glucose (HG), respectively. (oEVs) (nEVs) collected...

We study the asymptotic behavior of space-time codes when number transmit and receive antennas grows to infinity. Specifically, we determine pairwise error probabilities with maximum-likelihood (ML) decoding three types receiver interfaces: ML interface, linear zero-forcing (ZF) minimum-mean-square-error (MMSE) interface. Two situations are studied: receiving infinity while transmitting is finite, both numbers grow but their ratio remains constant. show that or interfaces performance...

We describe a simple technique for the numerical calculation, within any desired degree of accuracy, pairwise error probability (PEP) space-time codes over fading channels. This method applies also to calculation E[Q(/spl radic//spl xi/)] nonnegative random variable /spl xi/ whose moment-generating function Phi//sub xi//(s)=E[exp(-s/spl is known. Its application multiple antenna independent Rayleigh-fading channel and Rayleigh block discussed, illustrated by two examples.

The evaluation of error probabilities in digital communication systems is often amenable to computing a probability the form P(Δ ≤ 0), where Δ random variable whose distribution known. As an example, pairwise coded modulations can be expressed this form. authors advocate exceedingly general numerical method for calculation 0) based on Gauss-Chebyshev quadratures, which combines simplicity with accuracy.