  We apply a multi-phase transport (AMPT) model to study two-particle angular
correlations in $pp$ collisions at $\sqrt{s}= 7$ TeV. Besides being able to
describe the angular correlation functions of meson-meson pairs, a large
improvement for the angular correlations of baryon-baryon and
antibaryon-antibaryon is achieved. We further find that the AMPT model with new
quark coalescence provides an even better description on the anti-correlation
feature of baryon-baryon correlations observed in the experiments. We also
extend the study to p-Pb collisions at $\sqrt{s}= 5.02$ TeV and obtained
similar results. These results help us better understand the particle
production mechanism in $pp$ and p-Pb collisions at LHC energies.
