TY - JOUR
T1 - MIMO-OFDM-based Wireless-Powered Relaying Communication with an Energy Recycling Interface
AU - Nasir, Ali A.
AU - Tuan, Hoang D.
AU - Duong, Quang
AU - Poor, H. Vincent
PY - 2020/2/1
Y1 - 2020/2/1
N2 - This paper considers wireless-powered relaying
multiple-input-multiple-output (MIMO) communication, where
all four nodes (information source, energy source, relay, and
destination) are equipped with multiple antennas. Orthogonal
frequency division multiplexing (OFDM) is applied for information processing to compensate the frequency selectivity of
communication channels between the information source and the
relay and between the relay and the destination as these nodes are
assumed to be located far apart each other. The relay is equipped
with a full-duplexing interface for harvesting energy not only
from the wireless transmission of the dedicated energy source
but also from its own transmission while relaying the source
information to the destination. The problem of designing the
optimal power allocation over OFDM subcarriers and transmit
antennas to maximize the overall spectral efficiency is addressed.
Due to a very large number of subcarriers, this design problem
poses a large-scale nonconvex optimization problem involving
a few thousand variables of power allocation, which is very
computationally challenging. A novel path-following algorithm
is proposed for computation. Based on the developed closed-form
calculation of linear computational complexity at each iteration,
the proposed algorithm rapidly converges to an optimal solution.
Compared to the best existing solvers, the computational complexity of the proposed algorithm is reduced at least 105
times,
making it really efficient and practical for online computation
while that existing solvers are impotent. Numerical results for a
practical simulation setting show promising results by achieving
high spectral efficiency.
AB - This paper considers wireless-powered relaying
multiple-input-multiple-output (MIMO) communication, where
all four nodes (information source, energy source, relay, and
destination) are equipped with multiple antennas. Orthogonal
frequency division multiplexing (OFDM) is applied for information processing to compensate the frequency selectivity of
communication channels between the information source and the
relay and between the relay and the destination as these nodes are
assumed to be located far apart each other. The relay is equipped
with a full-duplexing interface for harvesting energy not only
from the wireless transmission of the dedicated energy source
but also from its own transmission while relaying the source
information to the destination. The problem of designing the
optimal power allocation over OFDM subcarriers and transmit
antennas to maximize the overall spectral efficiency is addressed.
Due to a very large number of subcarriers, this design problem
poses a large-scale nonconvex optimization problem involving
a few thousand variables of power allocation, which is very
computationally challenging. A novel path-following algorithm
is proposed for computation. Based on the developed closed-form
calculation of linear computational complexity at each iteration,
the proposed algorithm rapidly converges to an optimal solution.
Compared to the best existing solvers, the computational complexity of the proposed algorithm is reduced at least 105
times,
making it really efficient and practical for online computation
while that existing solvers are impotent. Numerical results for a
practical simulation setting show promising results by achieving
high spectral efficiency.
U2 - 10.1109/TCOMM.2019.2952897
DO - 10.1109/TCOMM.2019.2952897
M3 - Article
SN - 0090-6778
JO - IEEE Transactions on Communications
JF - IEEE Transactions on Communications
ER -
