Comparision of frequency and time domain differential modulation in an OFDM system for wireless ATM

Author

Lott, Matthias

Author_Institution

Commun. Network, Tech. Hochschule Aachen, Germany

Volume

2

fYear

1999

fDate

36342

Firstpage

877

Abstract

Wireless ATM systems at 5.2 GHz will use OFDM as the transmission scheme to combat the frequency selective radio channel. Differential modulation, e.g. DQPSK, is proposed in combination with OFDM to provides a cost-effective solution without the need for equalization. Depending on whether the differential modulated symbols are placed on the same sub-carrier of adjacent OFDM symbols or on different sub-carriers of the same OFDM symbol time domain and frequency domain modulation can be distinguished. Based on new closed-form BER expressions for OFDM/DQPSK transmission schemes with frequency and time domain differential modulation the performance with regard to the radio channel characteristic and the protocols for wireless ATM at 5.2 GHz are investigated

Keywords

OFDM modulation; asynchronous transfer mode; differential phase shift keying; error statistics; frequency-domain analysis; protocols; subcarrier multiplexing; time-domain analysis; wireless LAN; 5.2 GHz; DQPSK; Differential modulation; OFDM; OFDM/DQPSK transmission; closed-form BER expressions; differential modulated symbols; frequency domain differential modulation; frequency selective radio channel; performance; protocols; sub-carrier; time domain differential modulation; transmission scheme; wireless ATM; Bit error rate; Communication networks; Frequency domain analysis; Frequency modulation; Intelligent networks; Local area networks; OFDM modulation; Quality of service; Radio frequency; Wireless application protocol;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1999 IEEE 49th

Conference_Location

Houston, TX

ISSN

1090-3038

Print_ISBN

0-7803-5565-2

Type

conf

DOI

10.1109/VETEC.1999.780469

Filename

780469