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A Low Cost Direct Channel Feedback Method in OFDMA Systems |
Xu Dao-feng;Huang Yong-ming; Yang L -xi |
School of Information Science and Engineering, Southeast University, Nanjing 210096, China |
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Abstract A low cost, real-time CSI feedback method is proposed. The analog DownLink Channel State Information (DL-CSI) obtained at receivers is spreaded and then superimposed upon UpLink User Sequences (UL-US) before transmitting, thus avoiding DL-CSI from exclusive occupation of system resources. Using interference cancellation, iterative UL-US detection and DL-CSI estimation is carried out at base station. Due to spreading, DL-CSI can be accurately recovered even with little allocated energy. Simulations results demonstrate the practicability of the proposed method.
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Received: 27 November 2006
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