Low complexity space-frequency MLSE for multi-user COFDM

Author

Speth, Michael ; Senst, Andreas ; Meyr, Heinrich

Author_Institution

ISS, Tech. Hochschule Aachen, Germany

Volume

5

fYear

1999

fDate

1999

Firstpage

2395

Abstract

The possibility of multi-user detection with receiver diversity has gotten a lot of attention lately. In this paper we show how this technique can be realized using OFDM together with bit interleaved coded modulation (BICM) as coding scheme. We present an optimum MLSE based metric for the decoding in such systems. Since the optimum metric proves to be rather complex we develop an alternative approach based on the ML estimation of the transmission symbols. Following this approach, with very little additional receiver-complexity, a true multi-user detection of bandwidth efficient QAM schemes in extremely selective environments becomes possible.

Keywords

OFDM modulation; Viterbi decoding; computational complexity; dispersive channels; diversity reception; interleaved codes; maximum likelihood detection; maximum likelihood sequence estimation; modulation coding; quadrature amplitude modulation; ML estimation; MLSE based decoding; OFDM; Viterbi decoder; bandwidth efficient QAM; bit interleaved coded modulation; coding; decoding; dispersive channels; low complexity space-frequency MLSE; multi-user COFDM; multi-user detection; optimum MLSE based metric; receiver diversity; receiver-complexity; selective environments; transmission symbols; Bandwidth; Fading; Interleaved codes; Maximum likelihood decoding; Maximum likelihood estimation; Modulation coding; Multiuser detection; OFDM modulation; Signal processing; Space technology;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 1999. GLOBECOM '99

Print_ISBN

0-7803-5796-5

Type

conf

DOI

10.1109/GLOCOM.1999.831731

Filename

831731