PT-CMA and PT-MMA for OFDM in Wireless Communication

In this paper we introduce a new blind adaptive per tone equalization scheme in OFDM systems. The proposed equalizer scheme consists of a (complex) equalizer per tone. In this scheme, we compare the performance of the per tone multimodulus algorithm (PT-MMA) with the per tone constant modulus algorithm (PT-CMA). The PT-CMA for blind equalization requires a separate carrier-recovery system for phase recovery, but the PT-MMA performs joint blind equalization and carrier recovery without the need for a separate carrier-recovery system for QAM signal constellations. The PT-MMA compensates for an additional carrier frequency offset (CFO). The results of our simulations indicate that the PT-MMA can correct the phase error, because it implicitly incorporates a phase-tracking loop, which automatically recovers carrier phase.

[1]  Marc Moonen,et al.  Per-tone equalization for MIMO-OFDM systems , 2003, IEEE International Conference on Communications, 2003. ICC '03..

[2]  Vinko Erceg,et al.  Channel Models for Fixed Wireless Applications , 2001 .

[3]  Philip Schniter,et al.  Blind equalization using the constant modulus criterion: a review , 1998, Proc. IEEE.

[4]  Ian J. Wassell,et al.  Frequency scaled time domain equalization for OFDM in broadband fixed wireless access channels , 2002, 2002 IEEE Wireless Communications and Networking Conference Record. WCNC 2002 (Cat. No.02TH8609).

[5]  Kil Nam Oh,et al.  Modified constant modulus algorithm: blind equalization and carrier phase recovery algorithm , 1995, Proceedings IEEE International Conference on Communications ICC '95.

[6]  Jian Yang,et al.  The multimodulus blind equalization and its generalized algorithms , 2002, IEEE J. Sel. Areas Commun..

[7]  Richard K. Martin,et al.  Blind, Adaptive, Per Tone Equalization for Multicarrier Receivers , 2002 .