This paper introduces a preallocation-based multiple access protocol for wavelength-division multiplexed (WDM) optically interconnected passive star-coupled networks. The objective is to combine the strengths of two other preallocation-based strategies, interleaved slotted ALOHA (I-SA) and interleaved time division multiple access with multiple buffers (I-TDMA*), while minimizing their inherent...

Current SONET/SDH metro ring networks create the so–called metro gap which prevents high– speed clients from tapping into the vast amounts of bandwidth available in the backbone. To bridge this gap we propose and investigate by means of analysis and simulation a novel arrayed– waveguide grating (AWG) based single–hop wavelength division multiplexing (WDM) network with a physical star topology. ...

In wireless communication networks, when the workload increases, sources become more aggressive at the equilibrium in the game setting in comparison with the team problem by using slotted Aloha mechanism. Consequently, more packets are in collision and are lost. To reduce these phenomena and to enhance the performance of the networks, we propose to combine ZigZag decoding approach with non coop...

The paper compares the performance of two channelaccess schemes suitable for the cellular environment, which, in particular, allow the packet capture and can deal with inter-cell interference. The first scheme is the well known S-ALOHA while the second one is the Capture Division Packetized Access, recently proposed. The comparison is analytically performed over a common system with a common an...

Aloha-type random-access protocols have been employed as access control protocols in wireline and wireless, stationary and mobile, multiple-access communications networks. They are frequently employed by the control and signaling subsystem of demand-assigned multiple access protocols for regulating the sharing of a control channel. The latter is used for the transport of reservation packets req...

This paper addresses altogether time and frequency synchronization in IEEE 802.11a orthogonal frequency division multiplexing (OFDM) wireless communication systems. The proposed algorithms have two main features: (i) they make use of an additional source of information available at IEEE 802.11a physical layer, on top of the usual ones typically adopted for synchronization such as training seque...

Deployment of wireless relay nodes can enhance system capacity, extend wireless service coverage, and reduce energy consumption in wireless networks. Network coding enables us to mix two or more packets into a single coded packet at relay nodes and improve performances in wireless relay networks. In this paper, we succeed in developing analytical models of the throughput and delay on slotted AL...

We perform stability analysis of a recently proposed MAC protocol, hybrid ALOHA, based on the multipacket reception (MPR) model. Hybrid ALOHA distinguishes from conventional slotted ALOHA by allowing conditional collision-free channel estimation and simultaneous transmissions, and hence improves the MPR capability of the system. The stability analysis of the two-user case (N = 2) has been condu...

this paper argues that a risk averse of workers after-tax reservation wage the difference between her reservation wage and the tax needed to fund the unemployment insurance system when liquidity constraint binds exists and it is unique. the optimality of unemployment insurance based on the responsiveness of reservation wage to unemployment benefit shows the disincentive effect, i.e. higher unem...