MIMO DFE equalization for multitone DS/SS systems over multipath channels

Author

Vandendorpe, L. ; van de Wiel, O.

Author_Institution

Commun. & Remote Sensing Lab., Univ. Catholique de Louvain, Belgium

Volume

14

Issue

3

fYear

1996

fDate

4/1/1996 12:00:00 AM

Firstpage

502

Lastpage

511

Abstract

The combination of multitone modulation with direct sequence spectrum spreading (DS/SS) has been introduced in the past. The performance of a correlation receiver has been evaluated for a multipath channel and in the presence of an additional multiple access interference. We analyze the problem of decision feedback equalization (DFE) for such a system. In order to understand the potential of the system with equalization, we first study the steady-state behavior of the equalizer for a minimum mean square error (MMSE) criterion. The investigation is carried out for a receiver made of a bank of filters matched to both the symbol shape and the channel, and for a two path channel. Assuming transmission of binary phase shift keying (BPSK) symbols, an exact expression of the bit error probability is obtained in the form of an integral. Then adaptive least mean square (LMS) and recursive least square (RLS) structures are derived. The performance of the adaptive RLS algorithm is demonstrated by means of computer simulations

Keywords

MIMO systems; adaptive equalisers; band-pass filters; decision feedback equalisers; error statistics; least mean squares methods; multi-access systems; multipath channels; phase shift keying; probability; pseudonoise codes; radio receivers; radiofrequency interference; recursive estimation; spread spectrum communication; BPSK; LMS; MIMO DFE equalization; adaptive RLS algorithm; adaptive least mean square structure; binary phase shift keying; bit error probability; correlation receiver; decision feedback equalization; direct sequence spectrum spreading; exact expression; filter bank; integral; minimum mean square error criterion; multipath channels; multiple access interference; multitone DS/SS systems; multitone modulation; performance evaluation; recursive least square structure; steady-state behavior; symbol shape; two path channel; Binary phase shift keying; Channel bank filters; Decision feedback equalizers; Filter bank; MIMO; Mean square error methods; Multipath channels; Multiple access interference; Resonance light scattering; Steady-state;

fLanguage

English

Journal_Title

Selected Areas in Communications, IEEE Journal on

Publisher

ieee

ISSN

0733-8716

Type

jour

DOI

10.1109/49.490235

Filename

490235