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Adaptive noncoherent linear minimum ISI equalization for MDPSK and MDAPSK signals

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3 Author(s)
Schober, R. ; Toronto Univ., Ont., Canada ; Gerstacker, W.H. ; Huber, J.B.

A novel noncoherent linear equalization scheme is introduced and analyzed. In contrast to previously proposed noncoherent equalization schemes, the proposed scheme is not only applicable for M-ary differential phase-shift keying (MDPSK) but also for M-ary differential amplitude/phase-shift keying (MDAPSK). The novel scheme minimizes the variance of intersymbol interference (ISI) in the equalizer output signal. The optimum equalizer coefficients may be calculated directly from an eigenvalue problem. For an efficient recursive adaptation of the equalizer coefficients, a modified least-mean-square (LMS) and a modified recursive least-squares (RLS) algorithm are proposed. It is shown that the corresponding cost function has no spurious local minima that ensures global convergence of the adaptive algorithms. Simulations confirm the good performance of the proposed noncoherent equalization scheme and its robustness against frequency offset

Published in:

Signal Processing, IEEE Transactions on  (Volume:49 ,  Issue: 9 )

Date of Publication:

Sep 2001

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