Ubiquitous connectivity requirements and stringent quality-of-services (QoS)
in recent wireless communications demand new revolutionary wireless network
technologies to support the exponentially increasing traffic growth.
Massive multiple-input-multiple-output (MIMO) with the capability of high
spectral efficiency achieved by large multiplexing and diversity gains grabbed
a lot of attention as a promising solution for future cellular networks. Achieving
ultra-reliable and low latency communication is very challenging without
increasing the network infrastructure cost, or extra processing complexity.
Adapting space-time-block-codes (STBC) can improve the reliability of
the system, but this increases the downlink pilot overhead. Two precoders
are devised to exploit full spatial diversity with the blind combining process
to avoid downlink pilot overhead.