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High throughput satellites have proven to be an excellent solution to provide Internet services to white spots or to complement other existing infrastructures. With the use of multi-beam antennas, the same frequency may be reused dozens of times across a single satellite coverage area, increasing the system capacity and profitability. Legacy frequency reuse patterns such as uncoordinated 4-color scheme...
Dense small-cell deployments of 5G networks require a wireless backhaul to efficiently connect the small cells to the macro base station (BS). We envision a wireless backhaul architecture where cells are grouped into clusters. One small cell per cluster plays the role of a cluster head connecting the rest of the small cells to the macro cell via a mmWave MIMO link. We formulate the problem of jointly...
This paper proposes a novel indoor-outdoor caching relay system (CRS) and develops the corresponding caching mechanism, which can improve the utilization of wireless resources. It operates in two phases periodically. In Phase I, spectrum resources of the established links between MBS and user equipment (UE) are extracted to support data caching. In Phase II, caching relay system can directly serve...
Broadband technologies are playing a very significant role in the information exchange world. There is a growing trend toward bandwidth-hungry applications driven by data/ video consumption and continuous availability of service. Applications in different areas like in-flight entertainment, maritime connectivity, industrial communications, cellular backhaul via satellite, Internet access to end user,...
The inter-cell interference problem is a key challenge for the planning of OFDMA-based cellular networks. This paper shows the possible gains that can be obtained by employing a static Inter-Cell Interference Coordination (ICIC) scheme in the downlink. A simplified simulation-based capacity analysis study is performed investigating the correlation between system capacity and the distributions of power...
In this work, we revisit the issue of fair resource allocation in relay-enhanced wireless networks. Our focus this time is on Type-1a relays as proposed for LTE-Advanced. The latter operate as out-band relays, i.e., the backhaul and relay access link use separate carrier frequencies. If carrier aggregation is applied at the macro base station, the backhaul carrier may also contain part of the macro...
In this work, we investigate the issue of interference coordination in relay-enhanced networks. We focus on Type 1 in-band relays as proposed for LTE-Advanced, where the base station and the relay nodes share the same frequency for the backhaul and relay access link. While using full-buffer traffic for the downstream, we propose a centralized interference coordination algorithm to mitigate interference...
To further increase the experienced data rate per user, and to overcome the poor indoor penetration and the presence of dead-spots, the network architectures with relays, picocells and femtocells underlaying the macrocell network which are commonly referred as heterogeneous networks have drawn more and more researching interests. One of the main challenges of heterogeneous networks is the severe inter-cell...
Local, and Metropolitan Wireless Networks are often used to provide basic connectivity services, especially in areas where wired solutions are not yet implemented or not applicable. Unlicensed wireless networks have attracted a large interest, thanks to their low realization cost, with several limitations caused by regulatory, power restrictions and the presence of interferences. The paper analyses...
Along with Popularization of WLAN, The importance of Network Planning is given prominence to designer gradually. The paper give analyzing and research from requirement of user, coverage capability, load capability, interference issue, test of WLAN etc. and offer reference about deployment of WLAN.
Long Term Evolution (LTE) has been introduced by 3GPP (3rd Generation Partnership Project) and is poised to dominate the 4th generation (4G) of mobile telecommunication networks. In this article, we present an in-depth analysis of the LTE physical layer's characteristics and its performance. Our work is unique in providing a detailed performance study based on Release 8 of the 3GPP standard. Several...
The 3GPP (Third Generation Partnership Project) LTE (Long Term Evolution) activity towards the evolved UMTS (Universal Mobile Telecommunications System) Terrestrial Radio Access, which is known as E-UTRA, was started in November 2004 and recently culminated in the Release 8 of the 3GPP technical specifications, cf. e.g. the technical specifications 3GPP TS 36.101 and 3GPP TS 36.201. In the case of...
Summary form only given. The 802.11ac standard will push wireless LAN throughputs over the gigabit-per-second barrier in the coming years. Rather than only improving single link throughput by using more bandwidth and 256 QAM, 802.11ac also improves network throughput by adding MU MIMO capability. MU-MIMO makes it possible to achieve large throughputs cost effectively by having relatively simple client...
In this paper, we report on a mobile broadband wireless access (MBWA) system field trial with Fast Low-latency Access with Seamless Handoff Orthogonal Frequency Division Multiplexing (FLASH-OFDM). This paper describes coverage estimates of an uplink 64 quadrature amplitude modulation (QAM) signal under the condition of constant terminal output power when the signal bandwidth is up to 20 MHz. The estimates...
With the increase in the channel bandwidth to satisfy data rate requirements, the saturation of unlicensed bands quickly becomes a source of difficulty. The collisions that result from the ineluctable frequency reuse will then seriously hinder MAC layer performance. In this paper, we propose a new cross-layer aggregation scheme that increases throughput as a result of compromise between robustness...
This paper focuses on the performance evaluation of LTE uplink in presence of bursty data traffic. First, the performance of different power control (PC) strategies in different load conditions is evaluated. It is shown that the optimal PV policy depends on the load in the network and/or in the own cell. Simulation results demonstrate that in low load conditions applying no PC (or alternatively using...
In this paper, we report on a mobile broadband wireless access (MBWA) system field trial with Fast Low-latency Access with Seamless Handoff Orthogonal Frequency Division Multiplexing (FLASH-OFDM), which was carried out at Sendai city in Japan. This paper describes coverage estimates of an uplink 16 quadrature amplitude modulation (QAM) signal under the condition of constant terminal output power when...
The 3GPP (Third Generation Partnership Project) LTE (Long Term Evolution) activity towards the evolved UMTS (Universal Mobile Telecommunications System) Terrestrial Radio Access, which is known as E-UTRA, was started in November 2004 and recently culminated in the Release 8 of the 3GPP technical specifications, cf. e.g. the technical specifications 3GPP TS 36.101 and 3GPP TS 36.201. In the case of...
This paper addresses broadband radio access techniques for the long-term evolution (LTE) specified as the Release 8 specifications (Rel. 8 LTE) and LTE-Advanced in the 3rd Generation Partnership Project (3GPP). We first briefly describe the system requirements for the Rel. 8 LTE and LTE-Advanced. Then, we describe wider transmission bandwidths around 100 MHz to satisfy the peak data rate of 1 Gbps...
This paper studies the downlink closed loop transmission in the 3G long term evolution (LTE) system. We propose a precoding matrix selection algorithm from a finite codebook. The precoding, antenna selection, adaptive modulation and coding (AMC) require the channel information fed back from receiver to optimize the system performance. We study the codebook design and precoding matrix selection in...
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