In this letter, we show how to compute optimal constellations which maximize the capacity of M -PAM input AWGN (MIAWGN) channels with non-equiprobable symbols. We find for binary signaling that the optimal constellations, which minimize the bit error rate, will also maximize the capacity. The rate capacity of MIAWGN channels with non-equiprobable symbols and optimal constellations approaches to...

In quantum information theory, a basic question often presented is how efficiently can one transmit classical information over a quantum channel.[1, 2, 3] Because of the non-orthogonality of quantum states, the channel capacity is different from that of the classical channel discussed in [4, 5] . Recently, this question has attracted new attention due to the rapid progress in quantum informatio...

We show the equivalence of two different notions of quantum channel capacity: that which uses the entanglement fidelity as its criterion for success in transmission, and that which uses the minimum fidelity of pure states in a subspace of the input Hilbert space as its criterion. As a corollary, any source with entropy less than the capacity may be transmitted with high entanglement fidelity. W...

It is shown that no source encoding is needed in the definition of the capacity of a quantum channel for transmitting entanglement. This capacity bounds the “protected subspace” capacity. We find the capacity of the quantum erasure channel using these results, without relying on an unproven assumption as in an earlier paper. Typeset using REVTEX 1

Thirty three patients with definite ankylosing spondylitis (AS) were examined to establish the relation between restriction of chest expansion, limitation of lung function, and working capacity or exercise tolerance. As in previous studies there was a significant association between chest expansion and lung vital capacity. There was also a significant association between vital capacity and exer...

The capacity of a random-phase additive white Gaussian noise (AWGN) channel, referred to as noncoherent channel, is investigated in the case of a transmission of N information symbols. The non-Gaussianity of the capacity-achieving distribution is shown and a lower bound on the channel capacity is derived. For increasing values of the number of transmitted symbols N , the capacity of a noncohere...

BACKGROUND Vital capacity is a key parameter in the determination of lung function, usually assessed by means of a forced expiration maneuver. This maneuver can be exhausting, and patients often cannot complete it. OBJECTIVES This study evaluates a method to estimate forced vital capacity (FVC) based on the extrapolation of volume-time curves from forced expiration. METHODS The algorithm wa...

The serum transferrin concentration is usually overestimated when assessed as total iron binding capacity, because iron binds not only to transferrin but also, non-specifically, to other serum proteins [l-3]. Transferrin concentration can be measured directly by immunochemical methods including: radial immunodiffusion [ 1,2,4-61, immunonephelometric assay [6,7] and immunoturbidimetric assay [8,...

We introduce a proper framework of coding problems for a quantum memoryless channel and derive an asymptotic formula for the channel capacity, based upon the philosophy that any information theory shall be constructed in terms of observable quantities. Some general lower and upper bounds for the quantum channel capacity are also derived.

using the electrostatic capacity of a condenser, the existence of a distance function on a finsler space is discussed. this distance function divides finsler spaces into the two classes, denoted here by i and ii. the topology generated by this distance on the finsler spaces of class ii coincides with its intrinsic topology. this work provides a natural extension of mathematical analysis tools n...