Reduction of Feedback Based-on User Traffic Rate in OFDM Relay System | Zendy

Qian Bin Chen | Zendy; Guang Jian Jiang | Zendy; Lun Tang | Zendy

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Reduction of Feedback Based-on User Traffic Rate in OFDM Relay System

Author(s) -

Qian Bin Chen,

Guang Jian Jiang,

Lun Tang

Publication year - 2011

Publication title -

international journal of wireless and microwave technologies

Language(s) - English

Resource type - Journals

eISSN - 2076-9539

pISSN - 2076-1449

DOI - 10.5815/ijwmt.2011.05.05

Subject(s) - relay , reduction (mathematics) , orthogonal frequency division multiplexing , computer science , real time computing , electronic engineering , computer network , engineering , mathematics , physics , power (physics) , channel (broadcasting) , quantum mechanics , geometry

In order to reduce feedback while maintaining user performance in multiuser orthogonal frequency division multiplexing (OFDM) relay system, feedback mechanism based on user traffic rate is proposed. From the aspects of feedback outage probability, user weighted channel gain related to user traffic rate is compared with the system threshold. The higher user traffic rate is, the bigger the user traffic weight becomes. So the high traffic rate user has greater probability to be fed back, which can support different traffic rate. Simulation results show that the proposed feedback mechanism can bring more feedback sub-carriers to the user with high traffic rate

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