Noise analysis of DMT

Author

Tauböck, Georg

Author_Institution

Telecommun. Res. Center Vienna, Austria

Volume

4

fYear

2003

fDate

1-5 Dec. 2003

Firstpage

2136

Abstract

We consider discrete multitone (DMT, baseband OFDM) modulation and perform a detailed noise analysis which takes into account dependencies and power differences of the real and imaginary parts after the complex valued discrete Fourier transform (DFT). We show that for colored noise, rotated rectangular symbol constellations are more appropriate than the common (quadratic) QAM symbol constellations with respect to capacity and symbol error probability, and we derive formulas for the rotation angles and constellation sizes/densities.

Keywords

OFDM modulation; covariance matrices; discrete Fourier transforms; error statistics; quadrature amplitude modulation; random noise; DFT; DMT modulation; QAM symbol constellations; baseband OFDM modulation; capacity; colored noise; constellation densities; constellation sizes; discrete Fourier transform; discrete multitone modulation; noise analysis; pseudo-covariance matrix; rotated rectangular symbol constellations; rotation angles; symbol error probability; Baseband; Colored noise; Covariance matrix; Discrete Fourier transforms; Equalizers; Image analysis; OFDM modulation; Performance analysis; Random processes; Symmetric matrices;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 2003. GLOBECOM '03. IEEE

Print_ISBN

0-7803-7974-8

Type

conf

DOI

10.1109/GLOCOM.2003.1258613

Filename

1258613