… training process may find the best or relatively suboptimal communication beam pair, the
beamforming gain under the same channel conditions is mainly related to the …

… Therefore, they proposed a scheme for recovering wireless links through sub-optimal paths.
… new codebook design scheme for fast beam searching in millimeter-wave communications[J…

… beams, called a codebook, a transmitter-receiver can do a cell-level beam search, which is
also referred to as beam … codebook size will be sub-optimal in terms of the outage probability. …

… Millimeter-wave (mmWave) communications have emerged as a … beam search strategy
[12] founded on multi-resolution … to suboptimal beam selection due to the narrowing search …

… the best and the exploration of currently suboptimal configurations, so as to avoid missing
good … Dayoub, “Channel estimation techniques for millimeter-wave communication systems: …

… so as to reduce the beam search space for the future training … transmitting beam is chosen
from a predefined codebook c of … 7The beams found via exhaustive search may be sub-optimal…

… )-based online learning algorithm to solve the mmWave codebook selection problem under
… vehicular communication settings. In [6], a multi-level beam search strategy was designed by …

… core is to reduce the beam search space within the training … becomes sub-optimal and even
interrupts the communication link … , “Codebook design for beam alignment in millimeter wave …

… spectrum in higher frequencies, millimeter wave (mmWave) bands … beams, they can also
facilitate the beam search. A … Although suboptimal, an efficient algorithm to find F from c is OMP. …

… beam. In [40], a suboptimal codebook design and beam search algorithm with a hierarchical
scheme is proposed… The codebook design has two types of sub-codebooks ie coarse …