Using digital distortion, the Mach-Zehnder modulator nonlinearity is pre-compensated for direct detection OFDM system. The experiment and simulation results show that the method can extend the modulation index, improv...
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A new type of efficient and unidirectional optical coupler composed of periodic nanoslits is proposed for hybrid plasmonic waveguide. The operation principle and performance were analyzed and discussed. The coupling e...
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Offset Shuffle networks(OSNs) interleave a-posterior probability messages in the Block Row-Layered Decoder(BRLD) of QuasiCyclic Low-Density Parity-Check(QC-LDPC)***,OSNs usually consume a significant amount of computa...
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Offset Shuffle networks(OSNs) interleave a-posterior probability messages in the Block Row-Layered Decoder(BRLD) of QuasiCyclic Low-Density Parity-Check(QC-LDPC)***,OSNs usually consume a significant amount of computational resources and limit the clock frequency,particularly when the size of the Circulant Permutation Matrix(CPM)is *** simplify the architecture of the OSN,we propose a Simplified Offset Shuffle Network Block Progressive Edge-Growth(SOSNBPEG) algorithm to construct a class of QCLDPC *** SOSN-BPEG algorithm constrains the shift values of CPMs and the difference of the shift values in the same column by progressively appending check *** results indicate that the error performance of the SOSN-BPEG codes is the same as that of the codes in WiMAX and *** SOSNBPEG codes can reduce the complexity of the OSNs by up to 54.3%,and can improve the maximum frequency by up to 21.7%for various code lengths and rates.
We study the effect of radio signal shadowing dynamics, caused by vehicles and by buildings, on the performance of beaconing protocols in Inter-Vehicular communication (IVC). Recent research indicates that beaconing, ...
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Android is one of the most popular smart phone and tablet platforms;Zigbee is the standard for home automation and will play an important role on future WPAN. Enabling the Zigbee communication on Android can exploit t...
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This paper presents the design and implementation of the naming mechanism (NAME), a resource discovery and service location approach for Delay/Disruption-Tolerant Network (DTN). First discuss the architecture of NAME ...
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ISBN:
(纸本)9783319009506
This paper presents the design and implementation of the naming mechanism (NAME), a resource discovery and service location approach for Delay/Disruption-Tolerant Network (DTN). First discuss the architecture of NAME mainly including Name Knowledge Base, Name Dissemination, Name Resolution and Name-based Routing. In the design and implementation of NAME, we introduce the simple name-specifiers to describe name, the name-tree for name storage and the efficient predicate-based routing algorithm. Future work is finally discussed for completing NAME and providing APIs for abundant applications.
We propose a method of entangling two spinor Bose-Einstein condensates using a geometric phase gate. The scheme relies upon only the ac Stark shift and a common controllable optical mode coupled to the spins. Our sche...
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We propose a method of entangling two spinor Bose-Einstein condensates using a geometric phase gate. The scheme relies upon only the ac Stark shift and a common controllable optical mode coupled to the spins. Our scheme allows for the creation of an SzSz-type interaction where Sz is the total spin. The geometric phase gate can be executed in times of the order of 2πℏ/G, where G is the magnitude of the Stark shift. In contrast to related schemes which relied on a fourth-order interaction to produce entanglement, this is a second-order interaction in the number of atomic transitions. Closed expressions for the entangling phase are derived and the effects of decoherence due to cavity decay, spontaneous emission, and incomplete de-entangling of the light to the Bose-Einstein condensates are analyzed.
Globally, electric energy systems are faced with great challenges due to the massive growth of electricity generated by renewable energy sources. The situation in Germany is even more pronounced because of the planned...
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Globally, electric energy systems are faced with great challenges due to the massive growth of electricity generated by renewable energy sources. The situation in Germany is even more pronounced because of the planned phase-out of nuclear energy. The high penetration of volatile decentralized renewables such as wind and solar energy contributes to a shift of the electric energy system. The present legally guaranteed priority over conventional power plants leads to a change of the characteristics of the residual load - defined as the difference between electricity demand and the amount supplied by renewables. In order to predict various system aspects with adequate accuracy, we developed a flexible, validated, and efficient simulation model. In this paper, we describe our model and apply it to investigate the properties of the residual load based on the electric energy system of the German federal state Bavaria. The simulation results show that the mean of the residual load will decline whereas the hours of negative residual load will increase over the next ten years.
Polarization-interleaved OFDM-PON with double sideband modulation is presented for high speed next generation optical access network. 40-Gb/s OFDM-PON based on polarization interleaving and double sideband is experime...
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Opportunistic, mobility-assisted, or encounter networking is a method based on ad hoc networking and introduced to disseminate data in a store-and-forward manner by means of spontaneously connecting mobile devices. Al...
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Opportunistic, mobility-assisted, or encounter networking is a method based on ad hoc networking and introduced to disseminate data in a store-and-forward manner by means of spontaneously connecting mobile devices. Although, in many networked systems, mobility is treated as a challenge requiring additional management, in opportunistic networks, movement facilitates networking as it creates additional contacts between devices. These new networking opportunities can be exploited in addition to traditional wireless infrastructure networks or in absence of these networks. Hereby, algorithms for opportunistic data dissemination make use of information about social ties, regularities in movement, and the future path of mobile entities. The availability of this information is reasonable for areas such as campuses or conference venues, where social or professional ties are strong or when traveling by, for example, public transport lines or vehicles following a navigation system. Other movement activities of humans in larger areas often lack this information, and new techniques are required to derive similar useful movement information. By observing movement characteristics of network users such as average velocities or revisiting patterns, estimates about the likelihood of getting in contact with other devices can be estimated. Our approach goes one step further by introducing users' movement activities derived from movement patterns typical in, for example, tourist movement, shopping activities, or evening activities. Movement activities are notions summarizing a particular movement situation that is meaningful to users and can be used to further estimate user needs and user-generated network traffic. In case movement patterns are uncertain or fragmentary, knowledge about activities may help to faster estimate average movement characteristics. The main objective of this paper is to detail the approach of relating activities to observed multivariate mobility characteristics
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