Konferensartikel

Estimation of Phase Noise for QPSK Modulation over AWGN Channels

Florent Munier
Dept. of Signals and Systems (S2) and Microtechnology Centre at Chalmers (MC2) Chalmers University of Technology, Sweden

Eric Alpman
Dept. of Signals and Systems (S2) and Microtechnology Centre at Chalmers (MC2) Chalmers University of Technology, Sweden

Thomas Eriksson
Dept. of Signals and Systems (S2) and Microtechnology Centre at Chalmers (MC2) Chalmers University of Technology, Sweden

Arne Svensson
Dept. of Signals and Systems (S2) and Microtechnology Centre at Chalmers (MC2) Chalmers University of Technology, Sweden

Herbert Zirath
Dept. of Signals and Systems (S2) and Microtechnology Centre at Chalmers (MC2) Chalmers University of Technology, Sweden

Ladda ner artikelhttp://www.ep.liu.se/ecp_article/index.en.aspx?issue=008;article=030

Ingår i: GigaHertz 2003. Proceedings from the Seventh Symposium

Linköping Electronic Conference Proceedings 8:30, s.

Visa mer +

Publicerad: 2003-11-06

ISBN:

ISSN: 1650-3686 (tryckt), 1650-3740 (online)

Abstract

Every oscillator used in bandpass communication suffers from an instability of their phase (a.k.a. phase noise) that; if left unaddressed; can lead to great degradation of the system performance. In this paper; we tackle the problem of minimising the effect of oscillator phase noise on the coherent detection of a quadrature phase shift keying (QPSK) modulation operating on an Additive White Gaussian Noise (AWGN) channel. The phase noise process is modeled as a Wiener-Levy (random walk) process. Our approach uses maximum likelihood (ML) estimation of phase noise. Thorough analysis and derivation for Decision Directed (DD); Non-Data Aided (NDA); used with and without symbol differential encoding; and pilot based estimators are presented. We compare these estimators with respect to their main features and evaluate their bit error rate (BER) performances throught simulations. Results show that for low signal to noise ratio (SNR) applications; the use of differential encoding along with the proposed DD or NDA estimator yields performances with an SNR penalty below the two dB imposed by the non coherent detection methods; while pilot based estimation using wiener interpolation makes it possible to detect a QPSK modulation with SNR penalty around two dB.

Nyckelord

Inga nyckelord är tillgängliga

Referenser

[1] Herbert Zirath; “Afront end chipset for a 60 GHz radio receiver;” in Proc. of the GigaHertz Symposium on Gigahertz Electronics. Chalmers; Mar. 2001.

[2] Christian Fager; MMIC FET Frequency Doublers and FMCW radar Transceivers; Licenciate thesis; Chalmers University of Technology; Goteborg; Sweden; Mar. 2001.

[3] G.J. Foschini and G Vannucci; “Characterizing filtered light waves corrupted by phase noise;” in IEEE Transactions on Information Theory. IEEE; nov 1988; vol. 34; pp. 1437–1448.

[4] L. Tomba; “On the effect of wiener phase noise in ofdm systems;” in IEEE Transactions on Communications. IEEE; May 1998; vol. 46; pp. 580–583.

[5] M. Moeneclaey H. Meyr and S.A. Fechtel; Digital Communication Receivers; John Wiley and sons; 1998.

[6] S.M Kay; Fundamentals of Statistical Signal Processing; Prentice Hall International; 1993.

[7] J. Roychowdhury A. Demir; A. Mehrotra; “Phase noise in oscillators: a unifying theory and numerical methods for characterization;” in IEEE Transactions on Circuits and Systems. IEEE; May 2000; vol. 47; pp. 655–674.

[8] J. G. Proakis; Digital Communications; McGraw Hill; 1995.

Citeringar i Crossref