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A framework is proposed that allows for a joint description and optimization of both binary polar coding and 2 m-ary digital pulse-amplitude modulation (PAM) schemes such as multilevel coding (MLC) and bit-interleaved coded modulation (BICM). The conceptual equivalence of polar coding and multilevel coding is covered in detail. Based on an alternative(More)
Nanowire transistors with a perfect crystal structure and a well-defined Si– SiO 2 interface cannot be grown with the actual technology. The shape of the semiconducting channel varies from source to drain. By self-consistently coupling the three-dimensional Schrödinger and Poisson equations, interface roughness ͑IR͒ effects are studied in Si triple-gate(More)
—We consider the joint design of polar coding and higher-order modulation schemes for ever increased spectral efficiency. The close connection between the polar code construction and the multi-level coding approach is described in detail. Relations between different modulation schemes such as bit-interleaved coded modulation (BICM) and multi-level coding(More)
As the active dimensions of metal-oxide field-effect transistors are approaching the atomic scale, the electronic properties of these " nanowire " devices must be treated on a quantum mechanical level. In this paper, the transmission coefficients and the density of states of biased and unbiased Si and GaAs nanowires are simulated using the sp 3 d 5 s *(More)
—Multiple-symbol detection (MSD) is a powerful technique to improve the power efficiency of noncoherent receivers. In this paper, we derive the MSD metric for impulse-radio ultra-wideband for the general case of biorthogonal pulse-position modulation (bPPM) and relate it to its special cases BPSK and PPM. This unified treatment allows us to conduct a(More)
In this article, we study the coupled mode space approach to nonequilibrium Green's function ͑NEGF͒ simulation. When the lateral confinement of nanoscale devices changes abruptly and the correlation functions arising from coupled mode effects are improperly evaluated in the current and charge density calculations, it becomes difficult to solve(More)
—Matched decoding is a technique that enables the efficient maximum-likelihood sequence estimation of convolution-ally encoded PAM-transmission over ISI-channels. Recently, we have shown that the super-trellis of encoder and channel can be described with significantly fewer states without loss in Euclidean distance, by introducing a non-linear(More)
In this paper we present decision-feedback differential detection (DF-DD) schemes for autocorrelation-based detection in impulse-radio ultra-wideband (IR-UWB) systems, a signaling scheme regarded as a promising candidate in particular for low-complexity wireless sensor networks. To this end, we first discuss ideal noncoherent sequence estimation and(More)
At the nanometer scale, the computer simulation of electronic transport cannot be conceived without including quantum-mechanical effects as well as the atomic granularity of the simulation domain. In this review we present a three-dimensional quantum transport simulator based on the sp 3 d 5 s * semi-empirical tight-binding (TB) method that fulfills these(More)