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Joint carrier recovery and multimodulus blind decision-feedback equalization under high-order QAM

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2 Author(s)
Kun-Chien Hung ; Dept. of Electron. Eng. & Center for Telecommun. Res., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Lin, D.W.

The multimodulus algorithm (MMA) for blind equalization has good performance, but can only tolerate small carrier frequency offsets under high-order QAM. We propose a structure for joint carrier recovery (CR) and blind decision-feedback equalization (DFE), where the DFE is MMA-based. It turns out that a key point is the design and analysis of reduced-constellation phase detectors (PD) that can facilitate a wide frequency lock range and make the CR loop converge in severe intersymbol interference and noise. Based on this, we design a multistage startup procedure for joint blind DFE and CR. Simulations show that the procedure can yield fast convergence in large carrier frequency errors under high-order QAM.

Published in:

Global Telecommunications Conference, 2004. GLOBECOM '04. IEEE  (Volume:4 )

Date of Conference:

29 Nov.-3 Dec. 2004