Title :
Experimental evaluation of voiceband fractionally-spaced blind equalizer based on the constant modulus algorithm
Author :
Kaya, Mustafa ; Cockburn, Bruce F.
Author_Institution :
Dept. of Electr. & Comput. Eng., Alberta Univ., Edmonton, Alta., Canada
Abstract :
We describe the results of simulation experiments that evaluated several alternative blind equalizers for use in a voiceband QAM constellation classifier. The test signals included simulated signals as well as recordings of real fax and V.32bis modem test signals made at a monitoring point in the public telephone network. V.32bis has five operating modes that use 4, 16, 32, 64, and 125-QAM symbol constellations to provide bit rates of 4.8, 7.2, 9.6, 12.0, and 14.4 kbits/sec, respectively. Several different timing recovery and fractionally-spaced blind equalizer configurations were considered in conjunction with Godard´s (1978) constant modulus algorithm (CMA)
Keywords :
adaptive equalisers; adaptive filters; blind equalisers; digital simulation; facsimile; filtering theory; modems; quadrature amplitude modulation; signal classification; signal sampling; synchronisation; telephone networks; voice communication; 12.0 kbit/s; 125-QAM; 14.4 kbit/s; 32-QAM; 4.8 kbit/s; 64-QAM; 7.2 kbit/s; 9.6 kbit/s; V.32bis modem test signals; adaptive blind equalizer; adaptive filter; bit rates; constant modulus algorithm; experimental evaluation; operating modes; public telephone network; real fax signals; sampling rate converters; simulated signals; simulation experiments; test signals; timing recovery; voiceband QAM constellation classifier; voiceband fractionally-spaced blind equalizer; Blind equalizers; Clocks; Computational modeling; Constellation diagram; Modems; Monitoring; Sampling methods; Telephony; Testing; Timing;
Conference_Titel :
Electrical and Computer Engineering, 2000 Canadian Conference on
Conference_Location :
Halifax, NS
Print_ISBN :
0-7803-5957-7
DOI :
10.1109/CCECE.2000.849715
