Sequence detection in nonlinear channels: a convenient alternative to analog predistortion

A. Vannucci, R. Raheli
2002 IEEE Transactions on Communications  
A new maximum-likelihood sequence detection receiver for spectrally efficient linear modulations on bandlimited bandpass nonlinear channels is proposed. The receiver is based on oversampling the received signal corrupted by noise and nonlinear distortion. Contrary to other solutions in the literature, in the proposed technique there is no need for a bank of matched filters, and the receiver front end reduces to a single lowpass filter. For a given peak power level, a performance gain can be
more » ... eved over more traditional approaches to transmission on nonlinear channels, such as those based on predistortion, if a moderate spectral expansion is allowed. To analyze the receiver performance, the concept of distance spectrum is employed, since the minimum distance alone cannot account for a reliable performance evaluation. Both analysis and simulation are carried out for realistic narrowband nonlinear channels, possibly employing reduced-state sequence detection. Appreciable gain margins are confirmed to be possible in these realistic cases. Index Terms-Distance spectrum, maximum-likelihood sequence detection, nonlinear channels. partment, University of Roma, Rome, Italy, doing research activity in the field of acoustic phonetics. Since 1995, he has been with the Dipartimento di Ingegneria dell'Informazione, University of Parma, conducting research in the field of nonlinear radio channels from 1995 to 1998. Since 1999, his research interests have been in the field of optical transmission and optical communication systems. Riccardo Raheli (M'87) received the Dr. Ing. degree (Laurea) in electrical engineering (summa cum laude) from the University of Pisa, Pisa, Italy in 1983, the M.S. degree in electrical and computer engineering from the University of Massachusetts at Amherst in 1986, and the Ph.D. degree (Perfezionamento) in electrical engineering (summa cum laude) from the
doi:10.1109/tcomm.2002.802567 fatcat:qyiieioclbggldjsnqdqpzt55u