Acta Metallurgica Sinica(English letters) ›› 2013, Vol. 20 ›› Issue (4): 34-38.doi: 10.1016/S1005-8885(13)60066-7

• Wireless • Previous Articles     Next Articles

Analytical evaluation of hybrid feedback scheme for OFDMA system


  1. 1. Electronic and Information Engineering Department, Beijing City University, Beijing 100083, China 2. College of Electronic Information Engineering, Inner Mongolia University, Hohhot 010021, China
  • Received:2013-01-16 Revised:2013-04-15 Online:2013-08-31 Published:2013-08-30
  • Contact: SUN Qiao-Yun
  • Supported by:
    This work was supported by Key Laboratory of Universal Wireless Communications (KFKT-2010104), the National Natural Science Foundation of China (61001124), BCU (JYB201120), and Beijing City Special Finance Fund (PXM2012_014202_000201).

Abstract: This paper first introduces the performance analysis of two classical channel quality indicator (CQI) feedback schemes which are best-n feedback and the threshold based feedback and derives the mathematical expressions of average capacity which is described by Theorem 1 and 2. Then, a reduced feedback scheme is designed for multiple traffics and multi-channel. The novel scheme combines the best-n feedback and the threshold based feedback together to reduce the feedback overhead. The proposed scheme can not only guarantee the quality of service (QoS) requirement of real time (RT) traffic but also reduce feedback overhead at the cost of a marginal increased downlink overhead. Simulation results demonstrated the good performance of the proposed feedback scheme.

Key words: opportunistic scheduling, CQI, reduced feedback, proportional fairness (PF)