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Your search keyword '"Jaime Portugheis"' showing total 3 results
Start Over Author "Jaime Portugheis" Journal electronics letters
3 results on '"Jaime Portugheis"'

1. Capacity of blockwise noncoherent M-APSK/AWGN channel

Author

Daniel C. Cunha and Jaime Portugheis

Subjects
Channel capacity, symbols.namesake, Additive white Gaussian noise, symbols, Electronic engineering, Electrical and Electronic Engineering, Differential coding, Algorithm, Upper and lower bounds, Amplitude and phase-shift keying, Mathematics
Abstract

Capacity-achieving input distribution for the blockwise noncoherent M-APSK/AWGN channel is characterised. Upper and lower bounds on the normalised capacity, with and without the use of differential encoding, are derived. They show that the coherent channel capacity is approached with increasing channel coherence interval. Moreover, they indicate that the coherent capacity is approximated faster with differential encoding.

Published
2006
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2. New multistage decoding algorithm

Author

Jaime Portugheis, H. Hentsch, and Uwe Dettmar

Subjects
Signal-to-noise ratio, Reed–Solomon error correction, Code word, Electrical and Electronic Engineering, Algorithm, Word (computer architecture), Coding gain, Decoding methods, Mathematics, Phase-shift keying, Data transmission
Abstract

A new multistage decoding (MSD) algorithm for multilevel codes is proposed. The algorithm uses several decisions in the first stage, if the difference in distance measure between the codeword found by standard MSD (SMSD) and the received word is greater than a certain threshold. An application of the algorithm for a coded modulation system shows that more than half of the coding gain of maximum likelihood decoding (MLD) of the modulation system over SMSD is achieved, with only two decisions in the first stage.

Published
1992
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3. Linear generalised concatenated codes over ring Zq

Author

Jaime Portugheis and G. Khachatrian

Subjects
Combinatorics, Discrete mathematics, Ring (mathematics), Concatenated error correction code, Modulo, ComputingMethodologies_SYMBOLICANDALGEBRAICMANIPULATION, Concatenation, Code (cryptography), Electrical and Electronic Engineering, Information theory, Ring of integers, Linear code, Mathematics
Abstract

A method for constructing linear codes over the ring of integers modulo q, Zq, using the idea of generalised concatenated (GC) codes is presented.

Published
1992
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