Title :
A joint feedback reduction scheme using delta modulation for dynamic channel allocation in OFDMA systems
Author :
Cho, Myeon-gyun ; Seo, Woohyun ; Hong, Daesik
Author_Institution :
Telecommun. R&D Center, Samsung Electron., Co., Ltd., Suwon
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 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
Keywords :
channel allocation; delta modulation; error statistics; feedback; frequency division multiple access; greedy algorithms; OFDMA systems; bit error rate; channel gain; delta modulation; dynamic channel allocation; joint feedback reduction scheme; modified amplitude craving greedy method; performance degradation; reduced feedback information; Bit error rate; Channel allocation; Channel state information; Degradation; Delta modulation; Feedback; Frequency conversion; Performance loss; Signal processing; Transmitters;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2007.05107
