http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Jeng-Shin Sheu (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
On Antenna Orientation for Inter-Cell Interference Coordination in Cellular Network MIMO Systems
Sheu, Jeng-Shin,Lyu, Shin-Hong,Huang, Chuan-Yuan The Korea Institute of Information and Commucation 2016 Journal of communications and networks Vol.18 No.4
Next-generation (4G) systems are designed to support universal frequency reuse (UFR) to achieve best use of valuable spectra. However, it leads to undesirable interference level near cell borders. To control this, 4G systems adopt techniques, such as network multiple-input multiple-output (MIMO) and inter-cell interference coordination (ICIC), to improve cell-edge throughput. Network MIMO aims at mitigating inter-cell interference towards cell-edge users (CEUs) through multi-cell cooperation, where each collaborative base station serves both cell-center users (CCUs) and CEUs, including other cells' CEUs, under a power constraint. The present ICIC strategies cannot be directly applied to network MIMO because they were designed in absence of multi-cell coordination. In the presence of network MIMO, this paper investigates antenna orientations in ICIC and the method of power management. Results show that a proper antenna orientation can improve the cell-edge capacity and meantime lower the interference to CCUs. Capacity inconsistency between CCUs and CEUs is detrimental to mobile communications. Simulation results show that the proposed power management for ICIC in network MIMO systems can achieve a uniform data rate regardless users' position.
-
On Antenna Orientation for Inter-Cell Interference Coordination in Cellular Network MIMO Systems
Jeng-Shin Sheu,Shin-Hong Lyu,Chuan-Yuan Huang 한국통신학회 2016 Journal of communications and networks Vol.18 No.4
Next-generation (4G) systems are designed to supportuniversal frequency reuse (UFR) to achieve best use of valuablespectra. However, it leads to undesirable interference level nearcell borders. To control this, 4G systems adopt techniques, suchas network multiple-input multiple-output (MIMO) and inter-cellinterference coordination (ICIC), to improve cell-edge throughput. Network MIMO aims at mitigating inter-cell interference towardscell-edge users (CEUs) through multi-cell cooperation, where eachcollaborative base station serves both cell-center users (CCUs) andCEUs, including other cells’ CEUs, under a power constraint. The present ICIC strategies cannot be directly applied to networkMIMO because they were designed in absence of multi-cell coordination. In the presence of network MIMO, this paper investigatesantenna orientations in ICIC and the method of power management. Results show that a proper antenna orientation can improvethe cell-edge capacity and meantime lower the interferenceto CCUs. Capacity inconsistency between CCUs and CEUs is detrimentaltomobile communications. Simulation results show that theproposed power management for ICIC in network MIMO systemscan achieve a uniform data rate regardless users’ position.
-
Hybrid Digital and Analogue Beamforming Design for Millimeter Wave Relaying Systems
Jeng Shin Sheu 한국통신학회 2017 Journal of communications and networks Vol.19 No.5
Millimeter-wave (mm-wave) communication has beenconsidered as a potential technology for next-generation mobile cellularnetworks because of the vast amount of underutilised spectrumin these frequency bands. The very short wavelength enablesthe use of a massive number of antenna arrays to obtain sufficientbeamforming gains and received power. In practice, mm-wavecommunications adopt a hybrid radio frequency (RF) and baseband(BB) beamforming design to avoid allocating a dedicated RFchain for each antenna. In this paper, we propose hybrid beamformingschemes for multiuser mm-wave relaying systems. In particular,the RF and BB beamforming designs are separated to avoidthe intractable searching problem in a joint optimization. Simulationresults show that the proposed hybrid beamforming can usea small number of RF chains to approach the performance of conventionaldigital beamforming, in which each antenna is assigned toan individual RF chain. Results also demonstrate that the proposeddesign outperforms the conventional joint RF/BB design. Finally,the proposed hybrid beamforming method is further validated byintroducing channel estimation error, to which it is shown to berobust.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
