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Channel Estimation and LDPC Code Puncturing Schemes Based on Incremental Pilots for OFDM
Sung-Yoon Jung, and Sunghwan Kim
Abstract :	In this letter, we propose a channel estimation algorithm based on incremental pilots. These are pilots additionally inserted after puncturing the modulated orthogonal frequency division multiplexing (OFDM) symbols to enhance channel estimation performance without lowering bandwidth efficiency. A low-density parity-check code puncturing scheme is also proposed to prevent the performance degradation due to the codeword bit loss caused by punctured OFDM symbols.
Key word :	Channel estimation, low-density parity-check (LDPC) code, incremental pilots.
DOI :	http://dx.doi.org/10.4218/etrij.10.0210.0101
Cite this :	Sung-Yoon Jung, and Sunghwan Kim, "Channel Estimation and LDPC Code Puncturing Schemes Based on Incremental Pilots for OFDM," ETRI Journal, vol. 32, no. 4, Aug. 2010, pp. 603-606. http://dx.doi.org/10.4218/etrij.10.0210.0101
References :	1. M. Morelli and U. Mengali, "A Comparison of Pilot-Aided Channel Estimation Methods for OFDM Systems," IEEE Trans. Signal Process., vol. 49, no. 12, Dec. 2001, pp. 3065-3073. 2. S. Adireddy, L. Tong, and H. Viswanathan, "Optimal Placement of Training for Frequency-Selective Block-Fading Channels," IEEE Trans. Info. Theory, vol. 48, no. 8, Aug. 2002, pp. 2338-2353. 3. S. Kim et al., "Quasi-Cyclic Low-Density Parity-Check Codes with Girth Larger than 12," IEEE Trans. Inform. Theory, vol. 53, no. 8, Aug. 2007, pp. 2885-2891. 4. J. Kim, A. Ramamoorthy, and S.W. Mclaughlin, "Design of Efficiently-Encodable Rate-Compatible Irregular LDPC Codes," Proc. of ICC, June 2006, pp. 1131-1136. 5. V. Erceg et al., "IEEE P802.11 Wireless LANs: TGn Channel Models," IEEE 802.11-03/940r4, 2004.
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