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We consider an Ad-hoc network operating in multicast transmission mode in this work. To achieve a better transmission performance, especially in network capacity, transmission delay and their tradeoff, we propose to apply network coding and infrastructure mode respectively in two network models. In the model applying network coding, we introduce two-hop relaying algorithms with and without destination...
IEEE1588 is a Precise Time Protocol (PTP), which is of potentially wide application in control and measurement networks. Stamping PTP messages accurately in physical layer taking advantage of hardware circuits, it is one of important key technologies to achieve the object of high precision time synchronization of IEEE1588. This paper analyzes the content of IEEE1588 standard in detail, and proposes...
With the development of digital substation, the devices of the substation put forward higher demands on clock synchronization. The standard of the IEEE1588 provides a protocol that enables precise synchronization of clocks in measurement and control systems, and the precision of its network is sub-microsecond level which can satisfy the need of clock synchronization of the substation. This paper makes...
Enhanced Multimedia Broadcast/Multicast Service (EMBMS) is a new function defined in 3GPP specification, which supports download delivery and streaming delivery to group users in LTE mobile networks. In 3GPP Release 8 specification, the EMBMS transmission is classified into single-cell transmission and MBSFN (Multicast Broadcast Single Frequency Network transmission). In MBSFN, the statistical multiplexing...
In IEEE 802.11, multicast protocol is based on the basic access procedure of Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA). This protocol does not provide any recovery mechanism for multicast frames. As a result, transmitted multicast frames may be lost due to collisions or errors. Recently, several reliable multicast protocols at MAC layer have been proposed for 802.11. They can...
This paper is concerned with a leader-follower problem of cooperative multiple agents with a switching interconnection topology and communication delay. Distributed observers are designed for the second-order follower-agents to track a moving target (regarded as an active leader) with unmeasurable velocity and unknown constant input. Dynamic neighbor-based rules, consisting of distributed controllers...
The oscillatory and non-oscillatory behavior of solutions of the second-order quasi-linear neutral delay differential equation [a(t)|(x(t)+p(t)x(t−τ))′|α−1(x(t)+p(t)x(t−τ))′]′+q(t)f(x(t−σ))g(x′(t))=0, where t≥t0,α>0,τ≥0, and σ≥0 are constants, a,q∈C([t0,∞);R),p∈C1([t0,∞);R),f,g∈C(R;R), are studied. Our results generalize and improve some known results of neutral delay differential equations.
This work studies the performance of a data-driven reduced rank scheme for rapid timing acquisition in multiple access communications. Our results show that when only a limited amount of preamble bits are available, instead of the true second-order statistics (SOS), the reduced rank scheme provides reliable timing information. Exploiting the structure of the multiple access interference, the data...
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