Distributed Wireless Communication System Research Articles

중첩 융합 네트워크 환경을 고려한 STTC기반 이중 셀 시스템 분석 모델

The newly introduced model of a STTC-based Distributed Wireless Communication System (DWCS) can provide the capability of joint control of the signals at multiple cells. This paper has considered the virtual cell systems: the Dual Virtual Cell (DVC), and also proposes DVC employment strategy based on DWCS network. The considered system constructs DVC by using antenna selection method. Also, for multi-user high-rate data transmission, the proposed system introduces multiple antenna technology to get a spatial and temporal diversity gain and exploits space-time trellis codes known as STTC to increase a spectral efficiency.

중첩 융합 네트워크 환경에서 STTC기반 이중 셀 시스템의 성능분석

인지 기반 중첩 융합 네트워크 환경 하에서의 서비스 성능이 중요한 이슈로 떠오르는 가운데 단말기의 기능성이 좋아짐에 따라 스마트한 지능을 기반으로 자원의 효과적 활용에 적합한 개별 이종네트워크의 특성분석과 특성을 반영하는 시스템측면의 최적화가 매우 중요하게 되었다. 본 논문에서는 기지국의 소형화와 지능화가 진행되는 가운데 기지국 hotelling과 같은 기지국 집중화를 통한 통합적 최적화가 가능하므로 이에 대응한 이중 가상 셀 시스템의 특성에 대해 살펴보고 활용도 측면의 성능을 분석하였다. 또한 채널정보의 부정확성으로 인한 오류의 영향에 대해서 시뮬레이션을 통하여 정량적인 분석을 진행하고 의미하는 바를 논의하였다. In order to achieve high capacity and reliable link quality of the overlay convergent networks with the cognitive networking based on the advanced capability of the mobile terminal, a Distributed Wireless Communication System (DWCS) can provide the capability of enhancing the link quality. This paper has considered virtual cell: the Dual Virtual Cell (DVC), and also proposes DVC employment strategy based on radio resource monitering. The considered system constructs DVC for multi-user high-rate data transmission, and the DWCS system exploits space-time trellis codes i.e., STTC to improve a spectral efficiency. The effects of imperfect CSI(channel state information) on the system performance has also been investigated.

인지 네트워킹 기반 중첩 융합 네트워크에서 이중 가상 셀 운영방안의 성능분석

데이터 트래픽의 증가와 더불어 인지 기반 중첩 융합 네트워크 환경 하에서의 서비스 성능이 중요한 이슈로 떠오르고 있다. 이에 따라 다양한 이종 네트워크(HetNet)가 결합된 환경 하에서 주변상황의 인지 기능을 활용하는 이중 가상 셀의 구성과 특징에 대해 살펴보고 자원의 효과적 활용에 적합한 개별 이종 네트워크의 특성분석과 특성을 반영하는 시스템측면의 최적화를 고려하여 성능측면의 분석을 다루고자 한다. 이를 위해 가상 이중 셀 시스템의 구성과 운영이 필수적으로 요구된다. 본 논문에서는 기지국의 소형화와 지능화가 진행됨에 따른 활용도 측면의 성능을 분석하였다. 고려하는 시스템은 유용한 가상의 신호를 찾을 수 있는 능력을 활용하여 가상의 이중 셀을 구성하고 고속이동에 따른 무선링크에서의 성능열하를 방지하고 고속의 데이터 전송을 위한 시-공간 트렐리스 코드를 적용한 시스템의 성능을 분석하여 그 유용성에 대해서 시뮬레이션을 통하여 정량적인 분석결과를 얻었다. 이를 바탕으로 다양한 파라메터가 주어진 환경 하에서 전체 시스템에 어떤 영향를 미치는지를 해석하고 고려하는 시스템의 특징을 고찰하였다. With the fast growing data traffic, the performance of the convergent overlay network environment under the cognitive networking environment is crucial for the implementation of the efficient network structure. In order to achieve high capacity and reliable link quality in wireless communication of the overlay convergent networks with the cognitive networking based on the advanced capability of the mobile terminal, a Distributed Wireless Communication System (DWCS) can provide the capability of ambient-aware dual cell system's operation. This paper has considered virtual cell: the Dual Virtual Cell (DVC), and also proposes DVC employment strategy based on DWCS network. One is the Active Virtual Cell which exists for user's actual data traffic and the other is the Candidate Virtual Cell which contains a set of candidate antennas to protect user's link quality from performance degradation or interruption. The considered system constructs DVC by using cognitive ability of finding useful virtual signals. Also, for multi-user high-rate data transmission, the DWCS system exploits Space-Time Trellis Codes. The effects of changing environments on the system performance has been investigated thereafter.

The Way of Selection Antenna in Distributed Wireless Communication System

Distributed Wireless Communication System(DWCS) is a new communication system, which adapts to the future communication. In this system, antenna selection scheme plays a significant role in the communication quality which will influence the communication system performances. In this paper, the antenna selection method of DWCS is presented, and then makes detailed theoretical analysis. By selecting the number of antenna and dynamic formation of virtual cells, and then performance analysis results are in good agreement with simulation results, which verifies the validity of the method. The simulation shows that the antenna selection method of DWCS with dynamic virtual cells is better than the antenna selection method without dynamic virtual cells.

Adaptive transmission mode selection scheme for distributed wireless communication systems

The open architecture of distributed wireless communication systems (DWCS) provides the potential to increase capacity. In this letter, we develop an adaptive transmission mode selection (ATMS) scheme for the DWCSs, where the mobile stations (MS) could follow a separate serving, diversity, or data splitting transmission mode, based on the received signal to noise ratio (SNR) from each access point and the required quality-of-service (QoS) of the MSs. The proposed ATMS scheme increases the efficiency and the flexibility of radio resource management for the DWCSs.

Adaptive transmission mode selection scheme for distributed wireless communication systems

The open architecture of distributed wireless communication systems (DWCS) provides the potential to increase capacity. In this letter, we develop an adaptive transmission mode selection (ATMS) scheme for the DWCSs, where the mobile stations (MS) could follow a separate serving, diversity, or data splitting transmission mode, based on the received signal to noise ratio (SNR) from each access point and the required quality-of-service (QoS) of the MSs. The proposed ATMS scheme increases the efficiency and the flexibility of radio resource management for the DWCSs.

Capacity Analysis and Simulations of Distributed Wireless Communication System

The information theoretic capacity of a single user distributed wireless communication system (DWCS) is investigated and compared to that of traditional cellular MIMO system. Simulation results show that, DWCS always outperforms traditional MIMO system, and the capacity gain increase with the incremental number of the fixed antennas. Moreover, the use of distributed antennas in DWCS can average the shadowing effect and solve the near-far problem efficiently.

Distributed wireless communication system: a new architecture for future public wireless access

The distributed wireless communication system (DWCS) is a new architecture for a wireless access system with distributed antennas, distributed processors, and distributed control. With distributed antennas, the system capacity can be expanded through dense frequency reuse, and the transmission power can be greatly decreased. With distributed processors control, the system works like a software or network radio, so different standards can coexist, and the system capacity can be increased by coprocessing of signals to and from multiple antennas.