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Titolo:
Power control in feedback communications over a fading channel
Autore:
Saarinen, I; Mammela, A; Jarvensivu, P; Ruotsalainen, K;
Indirizzi:
VTT Elect, Infotech Oulu, FIN-90571 Oulu, Finland VTT Elect Oulu FinlandFIN-90571 Infotech Oulu, FIN-90571 Oulu, Finland Univ Oulu, Telecommun Lab, FIN-90014 Oulu, Finland Univ Oulu Oulu Finland FIN-90014 Telecommun Lab, FIN-90014 Oulu, Finland Univ Oulu, Div Math, FIN-90401 Oulu, Finland Univ Oulu Oulu Finland FIN-90401 Oulu, Div Math, FIN-90401 Oulu, Finland
Titolo Testata:
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
fascicolo: 5, volume: 50, anno: 2001,
pagine: 1231 - 1239
SICI:
0018-9545(200109)50:5<1231:PCIFCO>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
CDMA SYSTEM; RECEPTION; CAPACITY;
Keywords:
channel estimation; closed-loop method; feedback communications; pilot symbol assisted modulation; power control;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Saarinen, I VTT Elect, Infotech Oulu, FIN-90571 Oulu, Finland VTT Elect Oulu Finland FIN-90571 lu, FIN-90571 Oulu, Finland
Citazione:
I. Saarinen et al., "Power control in feedback communications over a fading channel", IEEE VEH T, 50(5), 2001, pp. 1231-1239

Abstract

Pilot symbol assisted modulation and a minimum mean-square error (MMSE) channel predictor are used to employ feedback MMSE power control over a frequency nonselective slow Rayleigh fading channel. Feedback is assumed to be noiseless and delayless. First, the performance of the pilot symbol system using MMSE power control is derived in the case of the frame size of two. Lag error is noticed to cause severe performance degradation, even when the channel is very slowly fading. In order to decrease the lag error and to geta good system performance, the number of estimator coefficients is found to become quite large. Operating strategy of MMSE power control is studied by Monte Carlo simulations and compared to various strategies presented in the literature. Spectral efficiency of the pilot symbol system is increased by transmitting more than one data symbol in a given frame. Finally, the performance of the pilot symbol system using MMSE power control is derived inthe case of an optimal frame size.

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Documento generato il 13/08/20 alle ore 13:59:33