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학술지 Precoding Design for Multi-User MISO Systems With Delay-Constrained and -Tolerant Users
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김민수, 박정훈, 이제민
IEEE Transactions on Wireless Communications, v.21 no.7, pp.5090-5105
22HH1900, 3차원 공간 이동통신 기술 개발, 이문식
In both academia and industry, multi-user multiple-input single-output (MU-MISO) techniques have shown enormous gains in spectral efficiency by exploiting spatial degrees of freedom. So far, an underlying assumption in most of the existing MU-MISO design has been that all the users use infinite blocklength, so that they can achieve the Shannon capacity. This setup, however, is not suitable considering delay-constrained users whose blocklength tends to be finite. In this paper, we consider a heterogeneous setting in MU-MISO systems where delay-constrained users and delay-tolerant users coexist, called a DCTU-MISO network. To maximize the sum spectral efficiency in this system, we present the spectral efficiency for delay-tolerant users and provide a lower bound of the spectral efficiency for delay-constrained users. We consider an optimization problem that maximizes the sum spectral efficiency of delay-tolerant users while satisfying the latency constraint of delay-constrained users, and propose a generalized power iteration (GPI) precoding algorithm that finds a principal precoding vector. Furthermore, we extend a DCTU-MISO network to the multiple time slots scenario and propose a recursive GPI precoding algorithm. In simulation results, we validate proposed methods outperform baseline schemes and present the effect of network parameters on the average sum spectral efficiency.
KSP 제안 키워드
Degrees of freedom(DOF), Delay-Tolerant, Delay-constrained, Latency Constraint, Lower bound, MISO systems, Multiple-input single-output(MISO), Network Parameters, Optimization problem, Power iteration, Precoding Vector