  Next-generation wireless networks aim to deliver data speeds much faster than
5G. This requires base stations with lots of antennas and a large operating
bandwidth. These advanced base stations are expected to serve several
multiantenna user-equipment (UEs) simultaneously on the same time-frequency
resources on both the uplink and the downlink. The UE data rates are affected
by the following three main factors: UE rank, which refers to the number of
data layers used by each UE, UE frequency allocation, which refers to the
assignment of slices of the overall frequency band to use for each UE in an
orthogonal frequency-division multiplexing (OFDM) system, and UE power
allocation/control, which refers to the allocation of power by the base station
for data transmission to each UE on the downlink or the power used by each UE
to send data on the uplink. Since multiple UEs are to be simultaneously served,
the type of precoder used for downlink transmission and the type of receiver
used for uplink reception predominantly influence these three aforementioned
factors and the resulting overall UE throughput. This paper addresses the
problem of jointly selecting these three parameters specifically when
zero-forcing (ZF) precoders are used for downlink transmission and linear
minimum mean square error (LMMSE) receivers are employed for uplink reception.
