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

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3 Author(s)
Myeon-gyun Cho ; Telecommun. R&D Center, Samsung Electron., Co., Ltd., Suwon ; Woohyun Seo ; Daesik Hong

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 a 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

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Wireless Communications, IEEE Transactions on  (Volume:6 ,  Issue: 1 )