Title :
Adaptive noncoherent linear minimum ISI equalization for MDAPSK signals
Author :
Schober, Robert ; Gerstacker, Wolfgang H. ; Huber, Johannes B.
Author_Institution :
Lab. fur Nachrichtentech., Erlangen-Nurnberg Univ., Germany
Abstract :
A novel noncoherent linear equalization scheme is introduced and analyzed. 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) and 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) algorithm is proposed. Simulations confirm the good performance of the considered noncoherent equalization scheme and its robustness against frequency offset
Keywords :
adaptive equalisers; amplitude shift keying; differential detection; differential phase shift keying; digital simulation; feedback; intersymbol interference; least mean squares methods; M-ary differential amplitude/phase-shift keying; M-ary differential phase-shift keying; MDAPSK signals; adaptive noncoherent linear minimum ISI equalization; decision-feedback differential detector; eigenvalue problem; equalizer output signal; frequency offset robustness; intersymbol interference; modified LMS algorithm; modified least-mean-square algorithm; optimum equalizer coefficients; performance; recursive adaptation; simulations; Adaptive equalizers; Decision feedback equalizers; Ear; Frequency; Intersymbol interference; Laboratories; Least squares approximation; Robustness; Signal analysis; World Wide Web;
Conference_Titel :
Communications, 2000. ICC 2000. 2000 IEEE International Conference on
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-6283-7
DOI :
10.1109/ICC.2000.853780
