Viterbi algorithm detection of shaped BPSK in adjacent-channel interference with bandlimiting

Author

Ziemer, Rodger E. ; Johnson, Tom

Author_Institution

Dept. of Electr. & Comput. Eng., Colorado Univ., Colorado Springs, CO, USA

fYear

1994

fDate

2-5 Oct 1994

Firstpage

443

Abstract

The effect of adjacent channel interference (ACI) in UHF satellite communications (SATCOM) narrowband channels utilizing shaped biphase-shift keyed (SBPSK) modulation with Viterbi algorithm (VA) detection is examined. The SBPSK modulator, satellite channel, and demodulator with VA detection are modeled by a Monte Carlo simulation. The degradation in energy-per-bit-to-noise-spectral-density ratio (E_b/N₀) relative to BPSK performance in Gaussian noise is determined with channel separation as a parameter. This is compared with earlier results using integrate-and-dump (I&D) detection. For VA metrics matched to the ideal non-bandlimited channel, it is found that VA detection performs considerably better than I&D detection at low ACI ratios. For ACI ratios above 3 dB, the opposite is true. It is hypothesized that VA metrics more closely matched to the channel-induced distorted signal will give improved performance

Keywords

Monte Carlo methods; Viterbi detection; adjacent channel interference; demodulation; phase shift keying; satellite communication; Monte Carlo simulation; SATCOM narrowband channels; SBPSK; UHF satellite communications; VA metrics; Viterbi algorithm detection; adjacent-channel interference; bandlimiting; channel separation; channel-induced distorted signal; degradation; demodulator; energy-per-bit-to-noise-spectral-density ratio; nonbandlimited channel; performance; shaped BPSK; shaped biphase-shift keyed modulation; Binary phase shift keying; Demodulation; Distortion; Gas detectors; Interchannel interference; Narrowband; Phase modulation; Satellite communication; Springs; Viterbi algorithm;

fLanguage

English

Publisher

ieee

Conference_Titel

Military Communications Conference, 1994. MILCOM '94. Conference Record, 1994 IEEE

Conference_Location

Fort Monmouth, NJ

Print_ISBN

0-7803-1828-5

Type

conf

DOI

10.1109/MILCOM.1994.474001

Filename

474001