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Soft Estimates for Doubly Iterative Decoding with 8-PSK and 16-PSK Modulations

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Rotopanescu, A.M.; Trifina, L.; Tarniceriu, D.

Editorial: Frequenz, 3-4, p.101-107, 2012.


The paper addresses the doubly iterative decoding of space-time turbo codes with a large number of transmit and receive antennas. In the doubly iterative scheme, the decoder uses preliminary soft values of the coded symbols and the soft estimates only for Quadratic-Phase-Shift-Keying (QPSK) modulation have been determined. In this paper we propose and explain the soft estimates related to the signal constellations for 8-PSK and 16-PSK modulations. The coding gains, given in dB, have been determined through simulations for two situations: without double iterations and for doubly iterative decoding for a number of 1 and 4 iterations, using 16 transmit and receive antennas, respectively, showing the compromise between the spectral efficiency and the coding gain.

Cuvinte cheie: coduri turbo spatio-temporale, decodor dublu iterativ, estimati soft, modulatii 8PSK si 16PSK, performante BER/FER // space-time turbo codes, doubly iterative decoder, sot estimates, 8 PSK and 16 PSK modulations, BER/FER performances