Hybrid LISA for Wideband Multiuser Millimeter-Wave Communication Systems Under Beam Squint

This paper jointly addresses user scheduling and precoder/combiner design in the downlink of a wideband millimeter-wave communications system. We consider the orthogonal frequency-division multiplexing modulation to overcome the channel frequency selectivity and obtain a number of equivalent narrowb...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2019-02, Vol.18 (2), p.1277-1288
Main Authors: Gonzalez-Coma, Jose P., Utschick, Wolfgang, Castedo, Luis
Format: Article
Language:English
Subjects:
Bandwidths
beam squint
Broadband
Communications systems
Frequency division multiplexing
Frequency modulation
hybrid precoding and combining
Interference
linear successive allocation (LISA)
Mathematical analysis
Millimeter wave
Millimeter waves
MIMO
multiuser
Narrowband
OFDM
Orthogonal Frequency Division Multiplexing
Precoding
Selectivity
Steering
Vectors (mathematics)
Wideband
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Summary:This paper jointly addresses user scheduling and precoder/combiner design in the downlink of a wideband millimeter-wave communications system. We consider the orthogonal frequency-division multiplexing modulation to overcome the 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 steering vectors has to be taken into account to design the hybrid precoders and combiners. The proposed algorithmic solution is based on the linear successive allocation, 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. The numerical experiments show that the proposed method exhibits excellent performance with reasonable computational complexity.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2018.2890667