Hybrid LISA for Wideband Multiuser Millimeter Wave Communication Systems under Beam Squint
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Date
2019
Journal Title
Journal ISSN
Volume Title
Publisher
IEEE
Abstract
This work jointly addresses user scheduling and
precoder/combiner design in the downlink of a wideband mil limeter wave (mmWave) communications system. We consider
Orthogonal frequency-division multiplexing (OFDM) modulation
to overcome channel frequency selectivity and obtain a number
of equivalent narrowband channels. Hence, the main challenge
is that the analog preprocessing network is frequency flat and
common to all the users at the transmitter side. Moreover, the
effect of the signal bandwidth over the Uniform Linear Array
(ULA) steering vectors has to be taken into account to design
the hybrid precoders and combiners. The proposed algorithmic
solution is based on Linear Successive Allocation (LISA), which
greedily allocates streams to different users and computes the
corresponding precoders and combiners. By taking into account
the rank limitations imposed by the hardware at transmission
and reception, the performance loss in terms of achievable sum
rate for the hybrid approach is negligible. Numerical experiments
show that the proposed method exhibits excellent performance
with reasonable computational complexity.