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快时变信道下基于LSQR算法的ICI均衡 被引量：1

LSQR-based ICI equalization over rapidly time-varying channels
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摘要 为了尽量消除正交频分复用(OFDM)系统中由于信道快时变导致的子载波间干扰(ICI),确保快时变信道下的可靠通信,提出了一种低复杂度LSQR(least square QR)判决反馈均衡器(DFE).该均衡算法充分利用了带状矩阵特性和时域LSQR迭代计算的特点,在计算复杂度和性能之间取得了良好的折中.仿真结果表明,在快时变信道下与已有的块判决反馈均衡(BDFE)算法比较,在计算复杂度相当的条件下,所提出的算法可有效改善带状矩阵近似误差导致的性能损耗,在高信噪比情况下有效地克服了"地板效应",在保持低复杂度的同时获得了更好的性能. A novel low complexity least square QR decision feedback equalizer（LSQR-DFE） is proposed in order to eliminate inter-carrier interference（ICI） caused by rapidly time-varying channels and to enable reliable communications over rapidly time-varying channels in orthogonal frequency division multiplexing（OFDM） systems.The proposed equalization algorithm obtains a tradeoff between computations and performance by exploiting banded matrix properties and time-domain LSQR iterative computation.Compared with existing block decision feedback equalizer（BDFE） algorithms,simulation results show that,at the same computation complexity,the proposed equalization algorithm can effectively improve the performance loss by banded-matrix approximation errors and overcome error floor with high signal to noise ratios（SNR） over rapidly time-varying channels.The proposed algorithm obtains better performance while preserving low complexity.
作者 韩华 吴乐南
机构地区 东南大学信息科学与工程学院
出处 《东南大学学报（自然科学版）》 EI CAS CSCD 北大核心 2010年第2期231-234,共4页 Journal of Southeast University：Natural Science Edition
基金 国家自然科学基金资助项目(60872075) 国家高技术研究发展计划(863计划)资助项目(2008AA01Z227)
关键词 正交频分复用 载波间干扰 判决反馈均衡器 快时变信道 orthogonal frequency division multiplexing（OFDM） inter-carrier interference（ICI） decision feedback equalizer（DFE） rapidly time-varying channels
分类号 TN92 [电子电信—通信与信息系统]
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参考文献12

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同被引文献20

  • 1Zoltowski M D, Thomas T A. Novel zero-forcing, MMSE, and DFE equalizer structures employing oversam- piing and multiple receiver antennas [ J ]. IEEE Signals, Systems & Computers, 2002,2( 1 ) : 1111 - 1116.
  • 2Yi J, Varanasi M K, Jian L. Performance analysis of ZF and MMSE equalizers for MIMO Systems: An In-depth study of the high SNR regime[ J]. IEEE Information The- ory Society, 2011,57: 2008-2026.
  • 3Rugini L, Banelli P, Leus G. Simple equalization of time-varying channels for OFDM [ J ]. IEEE Communica- tion Letter, 2005, 9(7) : 619 -621.
  • 4Schniter P. Low-complexity equalization of OFDM in double selective channels [ J]. IEEE Transactions Signal Processing, 2004,52(4) : 1002 - 1011.
  • 5Rugini L, Banelli P. Performance analysis of banded e- qualizers for OFDM systems in Time-varying channels [ C ] //IEEE 8th workshop on signal processing advances in wireless communications. Helsinki,Finland, 2007 : 1 - 5.
  • 6Yu Y, Leung S, Lu F. Iterative frequency domain equali- zation for OFDM over. doubly selective channels [ C ] // IEEE ICASSP III. Florence, Italy,2007 : 453 -456.
  • 7Rugini L, Banelli P, Lens G. Block DFE and windowing for doppler-affected OFDM systems [ C ]//IEEE 6th work- shop on signal processing advances in wireless communi- cations. Paris, France,2005 : 470 - 474.
  • 8Kim K, Park H. A low complexity ICI cancellation meth- od for high mobility OFDM systems[ C]//IEEE Vehicular technology conference. Melbourne, Australia, 2006 : 2528 - 2532.
  • 9Andreas F M, Sameer V. Iterative methods for cancella- tion of intercarrier interference in OFDM systems [ J ]. IEEE Transactions on vehicular technology,2007,56(4) : 2158 - 2166.
  • 10Ma J Z, Tomonori S, Hideki F. ICI Cancellation method for OFDM systems using compressed sensing based chan- nel estimation [C ] //International symposium on intelli- gent signal processing and communication systems (IS- PACS). Chiang Mai, Thailand, 2011.

引证文献1

东南大学学报（自然科学版）
2010年 第2期

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