Browse > Article

Performance of a Coded Frequency Hopping OFDMA System with an Iterative Receiver in Uplink Cellular Environments  

Kim, Yun-Hee (경희대학교 전자정보학부 전자공학전공 디지털통신연구실)
Kang, Sung-Kyo (경희대학교 전자정보학부 전자공학전공 디지털통신연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.11C, 2005 , pp. 1108-1115 More about this Journal
Abstract
In this paper, we propose a practical iterative channel estimation and decoding method for an LDPC-coded frequency hopping OFDMA system in the uplink of a packet-based cellular system. In the method, the channel gain and noise variance are iteratively estimated with both pilot symbols and LDPC decoder outputs to provide more reliable decoding metrics in intercell interference (ICI) environments. In addition, the channel correlation coefficient is also estimated to select proper filter coefficients according to the channel variation rate. Through simulations under the various channel conditions and different receiver configurations, it is shown that the proposed iterative receiver improves the performance without boosting the pilot power and mitigates the adverse effects of the non-uniform ICI.
Keywords
OFDMA; iterative receiver; channel estimation; frequency hopping; uplink;
Citations & Related Records
연도 인용수 순위
  • Reference
1 P.Hoeher, S.Kaiser, and P. Robertson, 'Twodimensional pilot-symbol-aided channel estimation by Wiener filtering,' IEEE ICASSP, 3, pp.21-24, Apr. 1997
2 IEEE Std $802.16^{TM}$-2004, Air interface for fixed broadband wireless access systems, Oct. 2004
3 K.S. Kim, S.H. Lee, Y.H. Kim, and J.Y. Ahn, 'Design of a good binary LDPC code using cyclic shift matrices,' lEE Electr. Letters, 40(5), pp. 325-326, Mar. 2004   DOI   ScienceOn
4 TTA PG302 표준, 2.3 GHz 휴대 인터넷 표준-물리 계층, 2004년 12월.
5 Y. Li, L.J. Cimini, Jr., and N.R. Sollenberger, 'Robust channel estimation for OFDM systems with rapid dispersive fading channels.' IEEE Trans. Comm., 46 (7), pp. 902-915, July 1998   DOI   ScienceOn
6 Y. Li, 'Pilot-symbol-aided channel estimation of OFDM in wirelees systems,' IEEE Trans. Vehic. Techn., 49(4), pp. 1207-1215, July 2000   DOI   ScienceOn
7 M.C. Valenti and B.D. Woerner, 'Iterative channel estimation and decoding of pilot symbol assisted turbo codes over flat-fading channels,' IEEE J. Select. Areas Comm., 19(9), pp. 1697-1705, Sep. 2001   DOI   ScienceOn
8 D.J.C. MacKay, 'Good error correcting codes based on very sparse matrices,' IEEE Trans. Inform. Theory, 45(2), pp. 399-431, Mar. 1999   DOI   ScienceOn