Spatial transmit diversity techniques for broadband OFDM systems

Author

Kaiser, Stefan

Author_Institution

Inst. for Commun. & Navigation, German Aerosp. Center (DLR), Oberpfaffenhofen, Germany

Volume

3

fYear

2000

fDate

2000

Firstpage

1824

Abstract

In this paper, we investigate different spatial transmit diversity concepts for orthogonal frequency division multiplexing (OFDM) systems. The idea is to artificially increase the frequency and time selectivity of the resulting channel transfer function at the receiver antenna by specific time-variant phase rotations of the signal at the transmit antennas. The achievable performance gains with the proposed transmit diversity concepts are presented for convolutionally coded OFDM systems in typical indoor and outdoor environments. The new concepts can be implemented in already standardized and existing OFDM systems like DAB and DVB-T or HIPERLAN/2, IEEE 802.11 and MMAC, without changing the standards and the receivers. Moreover, we show further performance improvements by combining the spatial transmit diversity concepts for OFDM with code division multiplexing (CDM)

Keywords

OFDM modulation; broadband networks; indoor radio; land mobile radio; receiving antennas; transfer functions; transmitting antennas; DAB; DVB-T; HIPERLAN/2; IEEE 802.11; MMAC; broadband OFDM systems; channel transfer function; code division multiplexing; convolutionally coded OFDM system; frequency selectivity; indoor environment; orthogonal frequency division multiplexing; outdoor environment; performance gains; receiver antenna; spatial transmit diversity techniques; time selectivity; time-variant phase rotations; Code division multiplexing; Convolution; Convolutional codes; Digital video broadcasting; Diversity reception; OFDM; Performance gain; Receiving antennas; Transfer functions; Transmitting antennas;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 2000. GLOBECOM '00. IEEE

Conference_Location

San Francisco, CA

Print_ISBN

0-7803-6451-1

Type

conf

DOI

10.1109/GLOCOM.2000.891949

Filename

891949