Close-loop decision-directed pre-equalization for OFDM systems

Yujun Kuang; Keping Long; Yanjun Wang; Xiaolong Yang; Qianbin Chen; Yun Li

doi:10.1117/12.691668

28 September 2006 Close-loop decision-directed pre-equalization for OFDM systems

Yujun Kuang, Keping Long, Yanjun Wang, Xiaolong Yang, Qianbin Chen, Yun Li

Proceedings Volume 6354, Network Architectures, Management, and Applications IV; 635420 (2006) https://doi.org/10.1117/12.691668
Event: Asia-Pacific Optical Communications, 2006, Gwangju, South Korea

Abstract

The paper proposes a close-looped decision-directed pre-equalization scheme for OFDM systems, which can be divided into two stages: i) initialization stage; ii) calibrating and tracking stage. At the first stage, the transmitter set the pre-load information to all ones, and the receiver estimates the real channel information and returns it to the transmitter; after that the receiver would view an almost-flat fading channel and directly decode the constellations, and when no error found, it remap the data to constellation to create a local pilot to obtain a better estimation of apparent channel for the transmitter to repeatedly adjust its pre-load information. Simulation results show that the performance of iterative pre-equalization is better than that of conventional pre-equalization and post-equalization in the receiver and will be much better at high SNR.

Citation Download Citation

Yujun Kuang, Keping Long, Yanjun Wang, Xiaolong Yang, Qianbin Chen, and Yun Li "Close-loop decision-directed pre-equalization for OFDM systems", Proc. SPIE 6354, Network Architectures, Management, and Applications IV, 635420 (28 September 2006); https://doi.org/10.1117/12.691668

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KEYWORDS

Orthogonal frequency division multiplexing

Receivers

Transmitters

Error analysis

Signal to noise ratio

Systems modeling

Calibration

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