J. Semicond. > 2008, Volume 29 > Issue 12 > 2353-2358

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A Novel High-Speed Equalizer for QAM Signals

Jiang Zhixiang, Zhang Meng and Li Zichuang

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Abstract: A high-speed equalizer based on a new algorithm:stop-and-go-DD-LMS CMA (SGLMS-CMA) for quadrature amplitude modulation (QAM) signals is presented.It integrates conventional constant modulus algorithm (CMA) and decision-direct least-mean-square (DD-LMS) under stop-and-go principle.Matlab simulations indicate that,compared with conventional CMA,the new algorithm performs five times faster in convergence speed, 3~5dB improved in rudimental mean square error (MSE), 82% decreased in operation complexity and can correct a final phase ambiguity.As to the equalizer block in the system,synthesis results show that the SGLMS-CMA+DD-LMS equalizer's hardware consumption is only 5% greater than the CMA+DD-LMS equalizer's.Finally by using SMIC 0.18μm library to synthesis,the new equalizer is embedded into QAM demodulation chip,and test results show that the new equalizer acts better.

Key words: CMADD-LMSequalizer convergence speed phase ambiguity

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    Received: 18 August 2015 Revised: 06 August 2008 Online: Published: 01 December 2008

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      Jiang Zhixiang, Zhang Meng, Li Zichuang. A Novel High-Speed Equalizer for QAM Signals[J]. Journal of Semiconductors, 2008, In Press. Jiang Z X, Zhang M, Li Z C. A Novel High-Speed Equalizer for QAM Signals[J]. J. Semicond., 2008, 29(12): 2353.Export: BibTex EndNote
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      Jiang Zhixiang, Zhang Meng, Li Zichuang. A Novel High-Speed Equalizer for QAM Signals[J]. Journal of Semiconductors, 2008, In Press.

      Jiang Z X, Zhang M, Li Z C. A Novel High-Speed Equalizer for QAM Signals[J]. J. Semicond., 2008, 29(12): 2353.
      Export: BibTex EndNote

      A Novel High-Speed Equalizer for QAM Signals

      • Received Date: 2015-08-18
      • Accepted Date: 2008-04-23
      • Revised Date: 2008-08-06
      • Published Date: 2008-12-09

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