121 research outputs found
On the Performance of Downlink MIMO-ISAC
This letter analyzes the performance of sensing and communications (S\&C)
achieved by a multiple-input multiple-output downlink integrated S\&C (ISAC)
system. Three typical ISAC scenarios are studied, including the sensing-centric
design, communications-centric design, and Pareto optimal design. For each
scenario, diversity orders and high signal-to-noise ratio slopes of the sensing
rate and communication rate are derived to gain further insights. It is found
that ISAC can provide more degrees of freedom and a broader rate region than
existing frequency-division S\&C (FDSAC) techniques.Comment: 5 page
Sum-Rate Optimization for RIS-Aided Multiuser Communications with Movable Antenna
Reconfigurable intelligent surface (RIS) is known as a promising technology
to improve the performance of wireless communication networks, which has been
extensively studied. Movable antenna (MA) is a novel technology that fully
exploits the antenna position for enhancing the channel capacity. In this
paper, we propose a new RIS-aided multiuser communication system with MAs. The
sum-rate is maximized by jointly optimizing the beamforming, the reflection
coefficient (RC) values of RIS and the positions of MAs. A fractional
programming-based iterative algorithm is proposed to solve the formulated
non-convex problem, considering three assumptions for the RIS. Numerical
results are presented to verify the effectiveness of the proposed algorithm and
the superiority of the proposed MA-based system in terms of sum-rate.Comment: 5 page
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