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http://dx.doi.org/10.5515/KJKIEES.2012.23.1.038

Decision Feedback Equalizer Based on LDPC Code for Fast Processing and Performance Improvement  

Kim, Do-Hoon (Department of Electronic Engineering, Chungbuk National University)
Choi, Jin-Kyu (Department of Electronic Engineering, Chungbuk National University)
Ryu, Heung-Gyoon (Department of Electronic Engineering, Chungbuk National University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.23, no.1, 2012 , pp. 38-46 More about this Journal
Abstract
In this paper, we propose a decision feedback equalizer based on LDPC(Low Density Parity Check) code for the fast processing and performance improvement in OFDM system. LDPC code has good error correcting capability and its performance approaches the Shannon capacity limit. However, it has longer parity check matrix and needs more iteration numbers. In our proposed system, MSE(Mean Square Error) of signal between decision device and decoder is fed back to equalizer. This proposed system can improve BER performance because it corrects estimated channel response more accurately. In addition, the proposed system can reduce complexity because it has a lower number of iterations than system without feedback at the same performance. Simulation results evaluate and show the performance of OFDM system with the CFO and phase noise in multipath channel.
Keywords
LDPC; Decision Feedback Equalizer; MSE; CFO; Phase Noise; OFDM;
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