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Soft constraint satisfaction multimodulus blind equalization algorithms

IEEE SIGNAL PROCESSING LETTERS 2005年第9期12卷 637-640页

作者： Abrar, S Zerguine, A Deriche, M COMSATS Inst Informat Technol Dept Elect Engn Islamabad Pakistan King Fahd Univ Petr & Minerals Dept Elect Engn Dhahran 31261 Saudi Arabia

In this letter, a new multimodulus algorithm for blind equalization of complex communication channels is derived by solving a constrained optimization problem with relaxation. The intersymbol interference (ISI) optimization and phase-recovery capabilities of the proposed algorithm are analyzed. It is shown from computer simulations that superior performance for the derived algorithm over Lin's algorithm is obtained.

关键词： adaptive equalizers blind equalization multi-modulus algorithm reduced constellation algorithm soft-constraint satisfaction

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Compact constellation algorithm for blind equalization of QAM signals

Compact constellation algorithm for blind equalization of QA...

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International Networking and Communications Conference (INCC 2004)

作者： Abrar, S King Fahd Univ Petr & Minerals Dept Comp Engn Dhahran 31261 Saudi Arabia

ISBN: (纸本)0780383257

In this work, a new algorithm is presented for the blind equalization of complex signals. This algorithm combines the benefits of the well-known reduced-constellation algorithm (RCA) and decision-directed algorithm (DDA). The contribution lies in the technique to incorporate the sliced symbols (outcomes of decision device) in the weight adaptation process. Unlike the RCA, where the reduced constellation contains only four symbol points, the proposed algorithms uses all symbols of the signal constellation by compacting them in some statistical manner. The steady-state characteristic of the proposed algorithm is demonstrated by way of simulations and are compared to those of RCA. It is observed that the new algorithm has better steady-state performance than that of RCA.

关键词： blind equalization reduced constellation algorithm RCA decision-directed adaptive equalizer

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A new multimodulus blind equalization algorithm

A new multimodulus blind equalization algorithm

引用

International Networking and Communications Conference (INCC 2004)

作者： Abrar, S Zerguine, A King Fahd Univ Petr & Minerals Dept Comp Engn Dhahran 31261 Saudi Arabia

ISBN: (纸本)0780383257

In this work, a new algorithm is presented for the blind equalization of complex signals. This algorithm can be considered as a variant of well-known reduced constellation algorithm (RCA). The proposed algorithm is obtained by removing the discontinuity found in the RCA cost function. The steady-state performance of the proposed algorithm is demonstrated by way of simulations. In addition, closed form expressions are obtained for the dispersion constants and the minimum of the cost functions. The phase-recovery and inter-symbol interference optimization properties, exhibited by the proposed algorithm, are also discussed.

关键词： blind equalization reduced constellation algorithm RCA soft constraint satisfaction adaptive equalizer

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