A Joint Feedback Reduction Scheme Using Δ Modulation for Dynamic Channel Allocation in OFDMA Systems

Conference: PIMRC 2005 - 16th Annual IEEE International Symposium on Personal Indoor and Mobile Radio Communications
09/11/2005 - 09/14/2005 at Berlin, Germany

Proceedings: PIMRC 2005

Pages: 4Language: englishTyp: PDF

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Cho, Myeon-gyun; Kim, Youngsoo (Comm. & Network Lab., Samsung AIT, P.O. Box 111, Suwon, Korea)
Seo, Woohyun; Hong, Daesik (Center for Information Technology of Yonsei University (CITY), Information and Telecommunication Lab, 134 Shinchondong Seodaemungu, Seoul, Korea)

A novel feedback-reduction scheme is proposed for dynamic channel allocation (DCA) in OFDMA systems. Applying this δ-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.