Enhanced performance for an approximately MAI-free multiaccess OFDM transceiver by code selection

Author

Tsai, Shang-Ho ; Lin, Yuan-Pei ; Kuo, C. C Jay

Author_Institution

Dept. of Electr. Eng., Univ. of Southern California, Los Angeles, CA, USA

Volume

6

fYear

2004

fDate

26-29 Sept. 2004

Firstpage

4335

Abstract

A new code selection scheme is proposed to reduce the MAI of the approximately MAI-free OFDM transceiver that is known as repetitively coded multicarrier CDMA (RCMC-CDMA). If we use M/2 symmetric codewords or anti-symmetric codewords of the M Hadamard-Walsh codes, then the MAI of the system can be greatly reduced. With this code selection scheme, the requirement of a sufficiently large number of subchannels to achieve the MAI-free property can be relaxed so that the approximately MAI-free property still holds when the number of subchannels is relatively small.

Keywords

Hadamard codes; OFDM modulation; code division multiple access; radiofrequency interference; transceivers; Hadamard-Walsh codes; MC-CDMA; antisymmetric codewords; approximately MAI-free OFDM transceiver; approximately MAI-free multiaccess OFDM transceiver; code selection; multiaccess interference; repetitively coded multicarrier CDMA; symmetric codewords; Error correction; Error correction codes; Frequency division multiaccess; Intersymbol interference; Multiaccess communication; Multicarrier code division multiple access; Multiple access interference; Multiuser detection; OFDM; Transceivers;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th

ISSN

1090-3038

Print_ISBN

0-7803-8521-7

Type

conf

DOI

10.1109/VETECF.2004.1404897

Filename

1404897