  The first detection of a gravitational-wave signal of a coalescence of two
black holes marked the beginning of the era of gravitational-wave astronomy,
which opens exciting new possibilities in the fields of astronomy, astrophysics
and cosmology. The currently operating detectors of the LIGO and Virgo
collaborations are sensitive at relatively high frequencies, from 10 Hz up to
about a kHz, and are able to detect gravitational waves emitted in a short time
frame of less than a second (binary black holes) to minutes (binary neutron
stars). Future missions like LISA will be sensitive in lower frequency ranges,
which will make it possible to detect gravitational waves emitted long before
these binaries merge. In this article, we investigate the possibilities for
parameter estimation using the Fisher-matrix formalism with combined
information from present and future detectors in different frequency bands. The
detectors we consider are the LIGO/Virgo detectors, the Einstein Telescope
(ET), the Laser Interferometer Space Antenna (LISA), and the first stage of the
Deci- Hertz Interferometer Gravitational wave Observatory (B-DECIGO). The
underlying models are constructed in time domain, which allows us to accurately
model long-duration signal observations with multiband (or broadband) detector
networks on parameter estimation. We assess the benefit of combining
information from ground-based and space-borne detectors, and how choices of the
orbit of B-DECIGO influence parameter estimates.
