Title :
MLSE of shaped BPSK in bandlimited nonlinear channels
Author :
Ziemer, Rodger E. ; Turcotte, Randy
Author_Institution :
Electr. & Comput. Eng. Dept., Colorado, Univ., Colorado Springs, CO, USA
Abstract :
The application of the Viterbi algorithm (VA) to perform maximum-likelihood sequence estimation (MLSE) of shaped biphase-shift keyed (SBPSK) modulation is presented, and its performance characterized in channels typical of UHF military satellite communications by computer simulation. The channel models utilized consist of five-pole Chebyshev and 16 two-pole cascaded Butterworth filters followed, in some cases, by a nonlinear model for a traveling-wave tube (TWT) amplifier proposed by A. A. M. Saleh (1981). The VA detector is compared with integrate-and-dump (I&D) detection and a simplified metric calculation for the VA. The results show that even in severely bandlimited channels with the nonlinearity, VA detection gives improved performance. Without the nonlinearity, VA detection provides an Eb /No gain over I&D detection from two to three dB, depending on the amount of bandlimiting
Keywords :
Butterworth filters; Chebyshev filters; estimation theory; maximum likelihood estimation; military communication; phase shift keying; satellite communication; telecommunication channels; travelling wave amplifiers; MLSE; TWT amplifier; UHF military satellite communications; Viterbi algorithm; bandlimited nonlinear channels; five-pole Chebyshev filter; integrate-and-dump detection; maximum-likelihood sequence estimation; performance; shaped BPSK; two-pole cascaded Butterworth filters; Application software; Binary phase shift keying; Chebyshev approximation; Computer simulation; Detectors; Filters; Maximum likelihood detection; Maximum likelihood estimation; Military satellites; Viterbi algorithm;
Conference_Titel :
Military Communications Conference, 1993. MILCOM '93. Conference record. Communications on the Move., IEEE
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-0953-7
DOI :
10.1109/MILCOM.1993.408626
