Orthogonal frequency division multiplexing-interleave division multiple access (OFDM-IDMA) systems may suffer from serious inter-carrier interference (ICI) in time-and frequency-selective (doubly selective) channels. In such case, the conventional OFDM-IDMA detection algorithm for quasi-static channels will result in significantly performance degradation. In this paper, signal detection is inve...

We investigate point-to-point transmission over dispersive multiple-input/multiple-output channels (MIMO ISI channels). MIMO orthogonal frequency-division multiplexing decomposes the frequency-selective channel into a set of independent flat-fading MIMO channels. Remaining spatial interference has to be treated in each carrier individually by means of MIMO equalization/precoding. We combine sev...

New analytical upper bounds are derived for the performance of symbol-by-symbol maximum-likelihood (ML) Abend– Fritchman-type detectors for multi-amplitude/phase-modulated digital sequences transmitted over time-dispersive (generally) time-variant linear channels introducing finite Intersymbol Interference (ISI) and additive white Gaussian noise (AWGN). The proposed bounds are obtained starting...

Discord, originally notable as a signature of bipartite quantum correlation, in fact can be nonzero classically, i.e. arising from noisy measurements by one the two parties. Here we redefine classical discord to quantify channel distortion, contrast previous restriction state, and then show monotonic relationship between (channel) distortion. We that is equivalent (doubly stochastic) distortion...

Conflicting evidence has been obtained regarding whether transient receptor potential cation channels (TRPC) are store-operated channels (SOCs) or receptor-operated channels (ROCs). Moreover, the Ca/Na permeability ratio differs depending on whether the current-voltage (I-V) curve has a doubly rectifying shape or inward rectifying shape. To investigate the calcium permeability of TRPC4 channels...

The title compound, 2C(5)H(14)N(2) (2+)·P(4)O(12) (4-)·2Te(OH)(6), involves doubly protonated homopiperazinium cations, cyclo-tetra-phosphate anions and telluric acid mol-ecules. The framework possesses very large channels wherein the organic cations reside. A network of O-H⋯O, N-H⋯O and C-H⋯O hydrogen bonds consolidates the crystal packing.

Abstract: A particular property of the cellebrated MDIR receiver is introduced in this communication, namely, the fact that full exploitation of the diversity is obtained with multiple beamformers when the channel is spatially and timely dispersive. Therefore a new structure is developped which provides better performance. The hardware need for this new receiver may be obtained through reconfig...

The paper investigates adaptive equalization of timedispersive mobile ratio fading channels and develops a robust high performance Bayesian decision feedback equalizer (DFE). The characteristics and implementation aspects of this Bayesian DFE are analyzed, and its performance is compared with those of the conventional symbol or fractional spaced DFE and the maximum likelihood sequence estimator...