An Improved Cooperative Technique Sharing the Channel in OFDMA-Based System

Junpyo JEON  Hyoung-Muk LIM  Hyuncheol PARK  Hyoung-Kyu SONG  

IEICE TRANSACTIONS on Information and Systems   Vol.E97-D    No.12    pp.3222-3225
Publication Date: 2014/12/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2014EDL8024
Type of Manuscript: LETTER
Category: Fundamentals of Information Systems
cooperative communication,  DF,  OFDMA,  STBC,  

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Cooperative communication has been proposed to improve the disadvantages of the multiple-input multiple-output (MIMO) technique without using extra multiple antennas. In an orthogonal frequency division multiple access (OFDMA) system, a cooperative communication that each user shares their allocated sub-channels instead of the MIMO system has been proposed to improve the throughput. But the cooperative communication has a problem as the decreased throughput because it is necessary that users send and receive the information to each other to improve reliability. In this letter, the modified cooperative transmission scheme is proposed to improve reliability in the fading channel, and it can solve the problem for BER performance that is dependent on the errors in the first phase that exchanges the information between both users during the first time.