Browsing by Author "Fang, Chun-Hao"

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Joint Interference Cancellation and Resource Allocation for Full-Duplex Cloud Radio Access Networks
(2019-06-01)
Fang, Chun-Hao
;
Li, Pei-Rong
;
Feng, Kai-Ten
;
電機工程學系
;
Department of Electrical and Computer Engineering
In this paper, we study joint interference cancellation and resource allocation for full-duplex (FD) cloud radio access networks (C-RANs) with antenna correlation. The target is to maximize the capacity of downlink (DL) user equipments (UEs) with guaranteed quality of service (QoS) of uplink (UL) UEs under the constraints of DL and UL transmit power. Intractability of the considered problem involves non-convexity and coupling between postcoding and remote radio head (RRH) selection. To deal with the high coupling between system variables, an estimation-free self-interference (SI) cancellation (EFSC) scheme with merit of significantly reducing signaling overhead for channel estimation is proposed. The reduced signaling overhead is also derived in closed-form expression. Furthermore, we propose a generalized Bender's decomposition-based resource allocation (GRA) algorithm, which separates the continuous and discrete variables to solve the optimization problem. With the design of a flexible utility function, the tradeoff between DL capacity and co-channel interference (CCI) can be achieved. Moreover, we identify the scenario in which antenna correlation will be beneficial for both the UL and DL communications in FD C-RAN with the implementation of EFSC scheme. The effectiveness of the proposed methods and theorems are verified via simulation results.
Oblique Projection-Based Interference Cancellation in Full-Duplex MIMO Systems
(2016)
Fang, Chun-Hao
;
Li, Pei-Rong
;
Feng, Kai-Ten
;
電機工程學系
;
Department of Electrical and Computer Engineering
Full-duplex (FD) wireless communication systems have become an important research issue since it can increase spectral efficiency through higher spectrum utilization. The main challenge in achieving FD is the cancellation of strong interference at the received interface from the transmitted interface of a node, namely, self-interference (SI). Therefore, a technique for SI cancellation using an oblique projection-based postcoding (OPP) scheme is proposed in this paper. The major merit of the proposed OPP method is the non-necessity of SI channel estimation, which can reduce the signaling overhead and can be adopted even when the SI channel distribution is unknown. Simulation results show that the proposed OPP scheme can achieve significant performance gain in terms of signal-to-interference-plus-noise ratio (SINR) compared to conventional method.
QoE-Oriented Admission Control and Resource Allocation for Functional Split Millimeter-Wave Fronthaul Networks
(2019-01-01)
Huang, Tun-Ping
;
Fang, Chun-Hao
;
Li, Pei-Rong
;
Feng, Kai-Ten
;
電機工程學系
In this paper, a quality of experience (QoE)-oriented beam management and admission control (AC) problem is investigated with consideration of time-varying channels and delay requirement for different functional split (FS) millimeter (mm)-wave fronthaul networks. The original problem aims to maximize time-averaged QoE of distributed units (DUs) with coexistence of short-term and long-term constraints, which makes the considered problem intractable. By leveraging Lyapunov optimization technique, the formulated problem is converted into a series of AC and beam allocation (BA) problems. Two AC and BA (ACBA) algorithms are proposed to solve the converted problem based on whether it is implemented at central unit (CU-ACBA) or DU (DU-ACBA). Simulation results demonstrate technical insights and applicability of the proposed algorithms by indicating the appropriate scenario for each FS option (FSO).
Queue-Aware Beam Assignment and Rate Control for Time-Varying mm-Wave-Based Full-Duplex Small Cell Networks
(2020-01-01)
Fang, Chun-Hao
;
Feng, Kai-Ten
;
電機工程學系
;
Department of Electrical and Computer Engineering
This letter focuses on the resource management problem for uplink (UL) of millimeter wave based full-duplex small cell networks with consideration of user equipments' (UEs') queue backlog and time-varying channels. The original problem aims to maximize UL UEs' long-term quality of experience (QoE) under queue stability constraint. To solve the intractability caused by the long-term functions, the considered problem is converted into a series of beam assignment (BA) and rate control (RC) problems in each time slot by leveraging Lyapunov method. Furthermore, novel closed-form solutions (CFSs) for BA and RC policies are derived by considering beam usage constraints; whereas an iterative algorithm is proposed based on the CFSs. Simulation results verify the superiority of the proposed algorithm based on its performance on system delay and QoE.