We consider a secure integrated sensing and communication (ISAC) scenario, where signal is transmitted through state-dependent wiretap channel with one legitimate receiver which the transmitter communicates honest-but-curious target that wants to sense. The ISAC modeled as two fast-fading channels correlated Rayleigh fading coefficients independent additive Gaussian noise components. Delayed outputs are fed back improve performance estimate state sequence. establish illustrate an achievable...

The tradeoff between average transmission rate and delay is important for the system design of future wireless communication systems. In double-correlated multiple antenna channels, spatial degrees freedom allow to optimize transmit strategy under throughput/delay priority. this work, we maximize effective capacity a MIMO with covariance feedback. Interestingly, larger requirement is, more are used avoid low instantaneous rates. This fact shown analytically by deriving closed-form expression...

In this paper a highly flexible and scaleable multiband impulse radio UWB architecture for high data rates is described evaluated. The investigations are mainly focused on on-off-keying modulation combined with low-complexity non-coherent energy detection receiver. Various representative system configurations defined examined by simulation, studying effects of pulse generation, filtering, synchronization, demodulation channel coding.

We derive a parameterization of positive definite matrices using the Cholesky decomposition in combination with hyperspherical coordinates. Based on we develop simple and efficient method to randomly generate constant or bounded trace according uniform distribution. Further, present an implementation inversion either rejection sampling transforming beta The matrix might be independent interest, whereas random algorithm finds applications Monte Carlo simulations, testing algorithms,...

The objective of the reported study is to investigate impact cumulative interference from multiple UWB systems a narrowband victim receiver. investigations are restricted cellular receivers, in particular downlink GSM-900, GSM-1800, and UMTS voice service. Since indoor environments considered, three-dimensional geometry for spatial distribution devices assumed. To obtain realistic scenario, model describing transmission activity taken into account. outcome this statistical model, i.e.,...

The optimal transmit strategies of single-user multi-antenna systems with respect to average capacity maximization are well understood. However, the performance measure does neglect delay aspects which important for higher layer design. Therefore, we consider effective in a system covariance knowledge. strategy is derived and properties as function decay-rate requirement buffer occupancy analyzed. In particular, show that larger requirement, smaller beamforming optimality range, i.e., more...

In this paper, ergodic capacities of fading Gaussian multi-user channels with only statistical channel state information at the transmitter are considered. The main contributions twofold: First, we introduce a framework to classify random solely based on their joint distributions, such that can construct equivalent in order directly make use existing capacity results. To attain goal, leverage three schemes: maximal coupling, and copulas addition usual stochastic same marginal property....

In this paper, fast fading Gaussian multiuser channels are considered. If the channel state information (CSI) is perfectly known to transmitter, capacities have been derived for many cases in which satisfy certain information-theoretic orders such as degradedness, or strong/very strong interference. We study case when only statistics of CSI at an open problem general. The main contributions paper following: First, we derive a sufficient condition construct equivalent (having same capacity...

In this paper, fading Gaussian multiuser channels are considered. If the channel is perfectly known to transmitter, capacity has been established for many cases in which may satisfy certain information theoretic orders such as degradedness or strong/very strong interference. Here, we study case when only statistics of at transmitter an open problem general. The main contribution paper following: First, introduce a framework classify random based on their joint distributions by leveraging...

We study the ergodic capacity of a frequency-selective Rayleigh fading channel with correlated scattering, which finds application in area UWB. Under an average power constraint, we consider single-user, single-antenna transmission. Coherent reception is assumed full CSI at receiver and no transmitter. distinguish between continuous- discrete-time channel, modeled either as random process or vector generic covariance. As practically relevant example, examine exponentially attenuated...

We consider a discrete-time frequency- selective block-fading channel with Rayleigh fading and correlated scattering. This is relevant in the area of UWB if transceiver filters are included capacity analysis. Under an average power constraint, we assume single-user, single-antenna transmission full CSI at receiver no transmitter. For employed model, analyze variance random outage capacity. The together ergodic adequate means to estimate basically characterize behavior via Chebyshev's...

We investigate the application of copulas for characterizing channel orders, e.g., degradedness or strong/very strong interference, Gaussian multiuser channels with statistical state information at transmitter (CSIT). When there is solely CSIT, identifying such orders much more involved and, thus, capacity remains unknown in general. use maximum copula to construct equivalent by modifying joint distributions that these newly constructed possess certain orders. also derive sufficient...

For channels with time structure we introduce a condition that characterizes infinite, asymptotically decreasing output memory called information regularity. We show this is strictly weaker than asymptotic output-memorylessness, property was used to prove coding theorem for continuous-time in case of infinite capacity. further the still holds regular channels. Gaussian output-memoryless have fact finite memory. This demonstrates output-memorylessness quite restrictive. consider discrete- and...

We consider a secure integrated sensing and communication (ISAC) scenario, in which signal is transmitted through state-dependent wiretap channel with one legitimate receiver the transmitter communicates honest-but-curious target that wants to sense. The ISAC modeled as two fast-fading channels correlated Rayleigh fading coefficients independent additive Gaussian noise components. Delayed outputs are fed back improve performance estimate state sequence. establish illustrate an achievable...

A coding theorem and converse are proved for a large-class of abstract stationary channels with time structure including the result by Kadota Wyner (1972) on continuoustime real-valued as special cases. As main contribution, is significantly weaker condition channel output memory - called total ergodicity respect to finite alphabet block-memoryless input sources under crucial relaxation measurability requirement channel. These improvements achieved introducing suitable characterization...

The characterization of secrecy capacities Gaussian wiretap channels depends on the knowledge channel state information at transmitter (CSIT). When there is only statistical CSIT, capacity unknown in general. In this paper we investigate relation between usual multivariate stochastic order and degradedness among legitimate receiver's eavesdropper's under fast fading with CSIT. considered has multiple antennas receiver eavesdropper both have antennas. Based technique coupling derive criteria...

A coding theorem and converse are proved for abstract channels with time structure that contain continuous-time continuous-valued the result by Kadota Wyner from 1972 as special cases. As main contribution is a significantly weaker condition on channel output memory without imposing extra measurability requirements to channel. These improvements achieved introducing suitable characterization of information rate capacity. It shown Gaussian previously used ψ-mixing equivalent finite...

Correlated scattering occurs naturally in frequency-selective fading channels and its impact on the performance needs to be understood. In particular, we answer question whether uncorrelated model leads an optimistic or pessimistic estimation of actual average capacity. paper, use majorization for functions show that rate with perfectly informed receiver is largest if transmitter uninformed. If knows channel statistics, it can exploit this knowledge. We small SNR, behavior opposite, a lower...

Based on the canonical correlation analysis we derive series representations of probability density function (PDF) and cumulative distribution (CDF) information arbitrary Gaussian random vectors as well a general formula to calculate central moments. Using results give closed-form expressions PDF CDF explicit formulas moments for important special cases. Furthermore, recurrence tight approximations representations, which allow very efficient numerical calculations with an arbitrarily high...

The capacity regions of Gaussian broadcast channels depends on the knowledge channel state information (CSI). When there is only statistical CSI at transmitter and full receiver, ergodic region unknown in general. In this paper we investigate relation between degradedness stochastic orders among from to different receivers. We derive criteria identify for single multiple-antenna cases when belong usual order or increasing convex order. Examples illustrate usage derived criteria. also show a...