Title :
New decision-directed equalization algorithm for QAM communication systems
Author :
Xu, Jinbiao ; Wan, Yumin
Author_Institution :
Xidian Univ., Xi´´an, China
Abstract :
A new decision-directed (NDD) algorithm based on a new cost function is proposed for equalization of QAM channels. It can be seen as a variable step-size algorithm of the conventional DD algorithm, whose adaption step-size is changed according to the region in which the equalized signal lies in the constellation plane. The reasonableness of the new decision-directed algorithm is illustrated from the DD algorithm. The new algorithm can accomplish blind equalization and carrier phase recovery simultaneously and can achieve faster convergence speed and small residual ISI. Simulation results confirm the effectiveness of the proposed algorithm
Keywords :
convergence of numerical methods; decision theory; equalisers; intersymbol interference; pulse amplitude modulation; quadrature amplitude modulation; telecommunication channels; ISI; PAM; QAM channels equalization; QAM communication systems; adaption step-size; blind equalization; carrier phase recovery; constellation plane; convergence speed; cost function; decision-directed equalization algorithm; equalized signal; simulation results; variable step-size algorithm; Blind equalizers; Cost function; Decision feedback equalizers; Delay; Finite impulse response filter; Frequency; Quadrature amplitude modulation; Stochastic processes; Switches; White noise;
Conference_Titel :
Global Telecommunications Conference, 1996. GLOBECOM '96. 'Communications: The Key to Global Prosperity
Conference_Location :
London
Print_ISBN :
0-7803-3336-5
DOI :
10.1109/GLOCOM.1996.587662
