A joint feedback reduction scheme using delta modulation for dynamic channel allocation in OFDMA systems

Author

Cho, Myeon-gyun ; Seo, Woohyun ; Kim, Youngsoo ; Hong, Daesik

Author_Institution

Comm. & Network Lab., Samsung AIT, Suwon

Volume

4

fYear

2005

fDate

11-14 Sept. 2005

Firstpage

2747

Abstract

A novel feedback-reduction scheme is proposed for dynamic channel allocation (DCA) in OFDMA systems. Applying this delta-modulation (DM)-based scheme to the channel gain of adjacent subcarriers reduces the feedback information to 1 bit per subcarrier. Since this reduced feedback information can lead to performance degradation in the form of an increased bit error rate (BER), a modified amplitude craving greedy (ACG) method and improved DM are jointly adopted to minimize the loss. Simulation results verify that the proposed scheme can decrease feedback information by a factor of 1/M while retaining performance comparable to the full feedback case, which requires M bits per subcarrier as feedback information

Keywords

OFDM modulation; channel allocation; delta modulation; error statistics; feedback; frequency division multiple access; ACG; BER; DCA; OFDMA system; adjacent subcarrier; amplitude craving greedy method; bit error rate; delta-modulation-based scheme; dynamic channel allocation; feedback information; feedback-reduction scheme; orthogonal frequency division multiple access; Bit error rate; Channel allocation; Degradation; Delta modulation; Feedback; Frequency conversion; Information technology; Intelligent networks; Performance loss; Transmitters; dynamic channel allocation (DCA); feedback- information reduction; orthogonal frequency division multiple access (OFDMA);

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.2005.1651942

Filename

1651942