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http://dx.doi.org/10.1109/JCN.2013.000108

Efficient Channel State Feedback Scheme for Opportunistic Scheduling in OFDMA Systems by Scheduling Probability Prediction  

Ko, Soomin (Telecommunication Systems Business, Samsung Electronics Co., Ltd.)
Lee, Jungsu (School of Electrical Engineering and INMC, Seoul National University)
Lee, Byeong Gi (School of Electrical Engineering and INMC, Seoul National University)
Park, Daeyoung (School of Information and Communication Engineering, Inha University)
Publication Information
Journal of Communications and Networks / v.15, no.6, 2013 , pp. 589-600 More about this Journal
Abstract
In this paper, we propose a new feedback scheme called mode selection-based feedback by scheduling probability prediction (SPP-MF) for channel state feedback in OFDMA downlink system. We design the scheme such that it determines the more desirable feedback mode among selective feedback by scheduling probability prediction (SPP-SF) mode and bitmap feedback by scheduling probability prediction (SPP-BF) mode, by calculating and comparing the throughputs of the two modes. In both feedback modes, each user first calculates the scheduling probability of each subchannel (i.e., the probability that a user wins the scheduling competition for a subchannel) and then forms a feedback message based on the scheduling probability. Specifically, in the SPP-SF mode, each user reports the modulation and coding scheme (MCS) levels and indices of its best S subchannels in terms of the scheduling probability. In the SPP-BF mode, each user determines its scheduling probability threshold. Then, it forms a bitmap for the subchannels according to the scheduling probability threshold and sends the bitmap along with the threshold. Numerical results reveal that the proposed SPP-MF scheme achieves significant performance gain over the existing feedback schemes.
Keywords
Feedback reduction; mode selection; OFDMA; opportunistic scheduling; scheduling probability; wireless communication;
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