A comparison of bidimensional RLS and LMS equalizers for OFDM/DS transmission in an indoor environment

Author

Van de Wiel, O. ; Vandendorpe, L.

Author_Institution

Telecommun. & Remote Sensing Lab., Katholieke Univ., Leuven, Belgium

fYear

1994

fDate

28 Nov- 2 Dec 1994

Firstpage

71

Lastpage

75

Abstract

The combination of multitone transmission (also known as orthogonal frequency division multiplexing (OFDM)) with direct sequence spread spectrum (DS/SS) is suitable for the design of a multiuser system robust against channel impairments. For high bit rate applications in indoor channels, the need for equalization is high, because guard intervals cannot be used due to the CDMA feature introduced in the system. The paper presents a comparison between a recursive least square (RLS) scheme and a least mean square (LMS) algorithm, both extended for the equalization of OFDM/DS systems, implemented in linear or DFE modes

Keywords

code division multiple access; decision feedback equalisers; frequency division multiplexing; indoor radio; least mean squares methods; pseudonoise codes; recursive estimation; spread spectrum communication; telecommunication channels; DFE mode; DS/SS; OFDM/DS transmission; bidimensional LMS equalizer; bidimensional RLS equalizer; channel impairments; direct sequence spread spectrum; guard interval; high bit rate application; indoor channels; least mean squares; linear mode; multitone transmission; multiuser system; orthogonal frequency division multiplexing; recursive least squares; Bit rate; Equalizers; Intersymbol interference; Least squares approximation; Least squares methods; MIMO; Multiaccess communication; OFDM; Resonance light scattering; Robustness;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 1994. Communications Theory Mini-Conference Record, 1994 IEEE GLOBECOM., IEEE

Conference_Location

San Francisco, CA

Print_ISBN

0-7803-1820-X

Type

conf

DOI

10.1109/CTMC.1994.512579

Filename

512579