  Common signals in public channels of cellular systems are usually transmitted
omnidirectionally from the base station (BS). In recent years, both discrete
and consecutive omnidirectional space-time block codings (STBC) have been
proposed for massive multiple-input multiple-output (MIMO) systems with a
uniform linear array (ULA) configuration to ensure cell-wide coverage. In these
systems, constant received signal power at discrete angles, or constant
received signal sum power in a few consecutive time slots at any angle is
achieved. In addition, equal-power transmission per antenna and full spatial
diversity can be achieved as well. In this letter, by utilizing the property of
orthogonal complementary codes (OCCs), a new consecutive omnidirectional
quasi-orthogonal STBC (QOSTBC) design is proposed, in which constant received
sum power at any angle can be realized with equal-power transmission per
antenna through one STBC transmission, and a higher diversity order of 4 can be
achieved. In addition, the proposed design can be further extended to the
uniform planar array (UPA) configuration with the two-dimensional OCCs.
