Equalization for OFDMA Systems Exploiting Unused Subchannels

Author

Kim, Jaekwon ; Lee, Ye Hoon ; You, Cheolwoo ; Kim, Dong Ho

Author_Institution

Lab. of Commun. & Network, Samsung Adv. Inst. of Techonol., Kyeonggido

Volume

1

fYear

2005

fDate

11-14 Sept. 2005

Firstpage

372

Lastpage

376

Abstract

In orthogonal frequency division multiple access (OFDMA) systems, the cyclic prefix (CP) length needs to be no less than the longest channel delay spread of many users, reducing bandwidth efficiency more significantly than in single user OFDM systems. We propose a novel receiver for OFDMA systems with an insufficient CP, exploiting the unused subchannels for a user. With the aid of computer simulations, we demonstrate that the proposed equalization method is superior to the conventional equalization method using a time domain channel shortening filter in terms of the achievable SNR and the error performance

Keywords

OFDM modulation; equalisers; filtering theory; frequency division multiple access; telecommunication channels; time-domain analysis; OFDMA systems; cyclic prefix; equalization method; orthogonal frequency division multiple access; time domain channel shortening filter; unused subchannels; Bandwidth; Computer errors; Computer simulation; Data communication; Delay; Finite impulse response filter; Frequency conversion; Intersymbol interference; OFDM; Resource management; OFDMA; equalization;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal, Indoor and Mobile Radio Communications, 2005. PIMRC 2005. IEEE 16th International Symposium on

Conference_Location

Berlin

Print_ISBN

9.7838007291e+012

Type

conf

DOI

10.1109/PIMRC.2005.1651461

Filename

1651461