Description: 随着无线mesh网络的普及，其规模和复杂程度持续发展。然而多跳的mesh网络遇到越来越多的难题，比如带宽降低，无线干扰以及网络时延等。譬如，在网络中的每一跳吞吐量会下降多达50％，连续多跳情况下吞吐量下降得更迅速，其结果将导致网络性能的严重降低。在语音和视频应用大量运行的极端情况下，时延和RF干扰将达到不可接受的程度，而导致连接完全中断-wireless mesh network with the popularity of its size and complexity of sustainable development. However, multi-hop mesh networks encountered more and more problems, such as lower bandwidth, wireless interference and network delay, and so on. For example, in each of the network throughput would drop jump up to 50%, for a number of cases jumped more rapid decline in throughput, The results will lead to serious network performance lower. In voice and video applications running of a large number of extreme cases, delay and RF interference will reach an unacceptable level. which led to the link severed Platform: |
Size: 209493 |
Author:wolfguy |
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Description: 随着无线mesh网络的普及，其规模和复杂程度持续发展。然而多跳的mesh网络遇到越来越多的难题，比如带宽降低，无线干扰以及网络时延等。譬如，在网络中的每一跳吞吐量会下降多达50％，连续多跳情况下吞吐量下降得更迅速，其结果将导致网络性能的严重降低。在语音和视频应用大量运行的极端情况下，时延和RF干扰将达到不可接受的程度，而导致连接完全中断-wireless mesh network with the popularity of its size and complexity of sustainable development. However, multi-hop mesh networks encountered more and more problems, such as lower bandwidth, wireless interference and network delay, and so on. For example, in each of the network throughput would drop jump up to 50%, for a number of cases jumped more rapid decline in throughput, The results will lead to serious network performance lower. In voice and video applications running of a large number of extreme cases, delay and RF interference will reach an unacceptable level. which led to the link severed Platform: |
Size: 225996 |
Author:wolfguy |
Hits:
Description: 随着无线mesh网络的普及，其规模和复杂程度持续发展。然而多跳的mesh网络遇到越来越多的难题，比如带宽降低，无线干扰以及网络时延等。譬如，在网络中的每一跳吞吐量会下降多达50％，连续多跳情况下吞吐量下降得更迅速，其结果将导致网络性能的严重降低。在语音和视频应用大量运行的极端情况下，时延和RF干扰将达到不可接受的程度，而导致连接完全中断-wireless mesh network with the popularity of its size and complexity of sustainable development. However, multi-hop mesh networks encountered more and more problems, such as lower bandwidth, wireless interference and network delay, and so on. For example, in each of the network throughput would drop jump up to 50%, for a number of cases jumped more rapid decline in throughput, The results will lead to serious network performance lower. In voice and video applications running of a large number of extreme cases, delay and RF interference will reach an unacceptable level. which led to the link severed Platform: |
Size: 208896 |
Author:wolfguy |
Hits:
Description: 随着无线mesh网络的普及，其规模和复杂程度持续发展。然而多跳的mesh网络遇到越来越多的难题，比如带宽降低，无线干扰以及网络时延等。譬如，在网络中的每一跳吞吐量会下降多达50％，连续多跳情况下吞吐量下降得更迅速，其结果将导致网络性能的严重降低。在语音和视频应用大量运行的极端情况下，时延和RF干扰将达到不可接受的程度，而导致连接完全中断-wireless mesh network with the popularity of its size and complexity of sustainable development. However, multi-hop mesh networks encountered more and more problems, such as lower bandwidth, wireless interference and network delay, and so on. For example, in each of the network throughput would drop jump up to 50%, for a number of cases jumped more rapid decline in throughput, The results will lead to serious network performance lower. In voice and video applications running of a large number of extreme cases, delay and RF interference will reach an unacceptable level. which led to the link severed Platform: |
Size: 225280 |
Author:wolfguy |
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Description: In this paper, we address the problem of gateway
placement for throughput optimization in multi-hop wireless
mesh networks. Assume that each mesh nodes in the mesh
network has a traffi c demand. Given the number of gateways
to deploy (denoted by k) and the interference model in the
network, we study how to place exactly k gateways in the
mesh network such that the total throughput that can be
supported is maximized while it also ensure a certain fairness
among all mesh nodes. We propose a novel grid-based gateway
deployment method using a cross-layer throughput optimization.
Our proposed method can also be extended to work with
multi-channel and multi-radio mesh networks. Our extensive
evaluation demonstrates that our method can effectively exploit
the resources available and it performs much better than random
deployment and fi xed deployment methods. Platform: |
Size: 189440 |
Author:Dinh Huu Nghia |
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Description: An innovative gateway placement scheme is
proposed for wireless mesh networks (WMNs) in this paper. It
determines the location of a gateway based on a new
performance metric called multi-hop traffic-flow weight
(MTW). The MTW computation takes into account many
factors that impact the throughput of WMNs, i.e., the number
of mesh routers, the number of mesh clients, the number of
gateways, traffic demand from mesh clients, locations of
gateways, and possible interference among gateways. Thus, the
proposed gateway placement scheme provides a framework of
significantly improving throughput of WMNs through proper
placement of gateways. To evaluate the performance of the new
gateway placement scheme, a non-asymptotic throughput of
WMNs is derived by considering TDMA scheduling. The
derivations also provide a guideline for designing scheduling
schemes of WMNs. Numeric results show that the proposed
gateway placement scheme constantly outperforms other
schemes by a large margin. -An innovative gateway placement scheme is
proposed for wireless mesh networks (WMNs) in this paper. It
determines the location of a gateway based on a new
performance metric called multi-hop traffic-flow weight
(MTW). The MTW computation takes into account many
factors that impact the throughput of WMNs, i.e., the number
of mesh routers, the number of mesh clients, the number of
gateways, traffic demand from mesh clients, locations of
gateways, and possible interference among gateways. Thus, the
proposed gateway placement scheme provides a framework of
significantly improving throughput of WMNs through proper
placement of gateways. To evaluate the performance of the new
gateway placement scheme, a non-asymptotic throughput of
WMNs is derived by considering TDMA scheduling. The
derivations also provide a guideline for designing scheduling
schemes of WMNs. Numeric results show that the proposed
gateway placement scheme constantly outperforms other
schemes by a large margin. Platform: |
Size: 202752 |
Author:Dinh Huu Nghia |
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Description: An Empirical Interference Modeling for Link Reliability Assessment in Wireless Networks-Abstract—In recent years, it has been widely believed in the community that the link reliability is strongly related to received signal strength indicator (RSSI) [or signal-to-interference-plus-noise
ratio (SINR)] and external interference makes it unpredictable,which is different from the previous nderstanding that there is no tight relationship between the link reliability and RSSI (or
SINR), but multipath fading causes the unpredictability. However,both cannot fully explain why the unpredictability appears in the link state. In this aper, we unravel the following questions: 1)
What causes frame losses that are directly related to intermediate
link states? 2) Is RSSI or SINR a right criterion to representthe link reliability? 3) Is there a better easure to assess the link reliability? We fi rst confi gured a testbed for performing a real measurement study to identify the causes of frame losses,
and observed that link reliability depends on an intraframe SINR
distribut Platform: |
Size: 2442240 |
Author:gu |
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Description: In this paper, we address a new unexplored problem
- what are the optimal patterns to achieve connected coverage in
wireless networks with directional antennas. As their name implies,
directional antennas can focus their transmission energy in
a certain direction. This feature leads to lower cross-interference
and larger communication distance. It has been shown that with
proper scheduling mechanisms, directional antennas may substantially
improve networking performance in wireless networks.
In this paper, we propose a set of optimal patterns to achieve
full coverage and global connectivity under two different antenna
models, i.e., the sector model and the knob model. We also
introduce with detailed analysis several fundamental theorems
and conjectures. Finally, we examine a more realistic sensor
model, where sensing range and communication range may both
vary randomly. Results show that our designed patterns work
well even in unstable and fickle physical environment. Platform: |
Size: 1462272 |
Author:fahim68 |
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Description: A topology control approach for utilizing multiple channels in multi-radio wireless mesh networks We consider the channel assignment problem in a multi-radio wireless mesh network that
involves assigning channels to radio interfaces for achieving efficient channel utilization.
We present a graph–theoretic formulation of the channel assignment guided by a novel
topology control perspective, and show that the resulting optimization problem is NP-complete.
We also present an ILP formulation that is used for obtaining a lower bound for the
optimum. We then develop a new greedy heuristic channel assignment algorithm (termed
CLICA) for finding connected, low interference topologies by utilizing multiple channels.
Our uations show that the proposed CLICA algorithm exhibits similar behavior and
comparable performance relative to the optimum bound with respect to interference
and capacity measures.-A topology control approach for utilizing multiple channels in multi-radio wireless mesh networks We consider the channel assignment problem in a multi-radio wireless mesh network that
involves assigning channels to radio interfaces for achieving efficient channel utilization.
We present a graph–theoretic formulation of the channel assignment guided by a novel
topology control perspective, and show that the resulting optimization problem is NP-complete.
We also present an ILP formulation that is used for obtaining a lower bound for the
optimum. We then develop a new greedy heuristic channel assignment algorithm (termed
CLICA) for finding connected, low interference topologies by utilizing multiple channels.
Our uations show that the proposed CLICA algorithm exhibits similar behavior and
comparable performance relative to the optimum bound with respect to interference
and capacity measures. Platform: |
Size: 702464 |
Author:kader |
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Description: To fully exploit wireless radio resource and, thus,
increase spectrum efficiency, cognitive radios shall sense wire-
less environments and identify interference to allow opportunis-
tic transmissions for secondary systems. Based on Chen et al.
in their work about a terminal architecture for cognitive radio
networks, by further obtaining transmission information with a
rate–distance nature that is extended an overlay concept,
secondary systems can even leverage busy duration of primary
systems to enhance the opportunity to use spectrum under de-
rived tolerable interference to the primary orthogonal frequency-
division multiple access (OFDMA) system.-To fully exploit wireless radio resource and, thus,
increase spectrum efficiency, cognitive radios shall sense wire-
less environments and identify interference to allow opportunis-
tic transmissions for secondary systems. Based on Chen et al.
in their work about a terminal architecture for cognitive radio
networks, by further obtaining transmission information with a
rate–distance nature that is extended an overlay concept,
secondary systems can even leverage busy duration of primary
systems to enhance the opportunity to use spectrum under de-
rived tolerable interference to the primary orthogonal frequency-
division multiple access (OFDMA) system. Platform: |
Size: 970752 |
Author:Donna Loudoe |
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Description: Today’s wireless networks are characterized by fixed spectrum assignment policy. The limited available spectrum and the inefficiency in the spectrum usage necessitate a new communication paradigm to exploit the existing wireless spectrum opportunistically. Cognitive radio is a paradigm for wireless communication in which either a network or a wireless node changes its transmission or reception parameters to communicate efficiently avoiding interference with licensed or unlicensed users. It can capture best available spectrum to meet user communication requirements (spectrum management). Platform: |
Size: 1096704 |
Author:deena |
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Description: Intelligent reflecting surface (IRS) is a promising
technology to enhance the coverage and performance of wireless
networks. We consider the application of IRS to non-orthogonal
multiple access (NOMA), where a base station transmits superposed signals to multiple users by the virtue of an IRS. The
performance of an IRS-assisted NOMA networks with imperfect
successive interference cancellation (ipSIC) and perfect successive
interference cancellation (pSIC) is investigated by invoking 1-
bit coding scheme. In particular, we derive new exact and
asymptotic expressions for both outage probability and ergodic
rate of the m-th user with ipSIC/pSIC. Based on analytical
results, the diversity order of the m-th user with pSIC is in
connection with the number of reflecting elements and channel
ordering. The high signal-to-noise radio (SNR) slope of ergodic
rate for the m-th user is obtained. The throughput and energy
efficiency of IRS-NOMA networks are discussed both in delaylimited and delay-tolerant transmission modes. Additionally, we
derive new exact expressions of outage probability and ergodic
rate for IRS-assisted orthogonal multiple access (IRS-OMA).
Numerical results are presented to substantiate our analyses and
demonstrate that: i) The outage behaviors of IRS-NOMA are
superior to that of IRS-OMA and relaying schemes; ii) The M-th
user has a larger ergodic rate than IRS-OMA and benchmarks.
However, the ergodic performance of the m-th user exceeds
relaying schemes in the low SNR regime; and iii) The IRS-assisted
NOMA networks have ability to achieve the enhanced energy
efficiency compared to conventional cooperative communications Platform: |
Size: 340469 |
Author:dipfr@yahoo.fr |
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Description: To address the ever increasing high data rate and
connectivity requirements in the next generation 5G wireless
network, novel radio access technologies (RATs) are actively
explored to enhance the system spectral efficiency and connectivity. As a promising RAT for 5G cellular networks, nonorthogonal multiple access (NOMA) has attracted extensive
research attentions. Compared with orthogonal multiple access
(OMA) that has been widely applied in existing wireless communication systems, NOMA possesses the potential to further
improve system spectral efficiency and connectivity capability.
This paper develops analytical frameworks for NOMA downlink
and uplink multi-cell wireless systems to evaluate the system
outage probability and average achievable rate. In the downlink
NOMA system, two different NOMA group pairing schemes are
considered, based on which theoretical results on outage and
achievable data rates are derived. In the uplink NOMA, revised
back-off power control scheme is applied and outage probability
and per UE average achievable rate are derived. As wireless
networks turn into more and more densely deployed, inter-cell
interference has become a dominant capacity limiting factor but
has not been addressed in most of the existing NOMA studies.
In this paper a stochastic geometry approach is used to model a
dense wireless system that supports NOMA on both uplink and
downlink, based on which analytical results are derived either in
pseudo-closed forms or succinct closed forms and are further
validated by simulations. Numerical results demonstrate that
NOMA can bring considerable system-wide performance gain
compared to OMA on both uplink and downlink when properly
designed Platform: |
Size: 6695586 |
Author:dipfr@yahoo.fr |
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Search - interference in Wireless Networks