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This paper presents the radiation performance of a modified elliptical patch microstrip antenna (EPMA) simulated on glass epoxy FR4 substrate material. For modification in patch geometry, two parallel narrow slits in the EPMA geometry parallel to its minor axis are applied. In this way, patch is divided in three patches. The two outer patches are identical in shape and size. The central patch is excited...
In the present paper, a pentagonal microstrip patch antenna is proposed to achieve compact size, broadband and dual frequency operation. It is observed that the proposed antenna is radiating at two different frequencies without much loss in its radiation performance showing broad band performance. Both these resonance frequencies lie in the median band (3.25 to 3.85 GHz) of WiMax systems, a new standard...
A circular patch antenna with a narrow slit is proposed to achieve multi frequency, dual band operation. The proposed antenna radiates at four different frequencies with sufficiently high matching with probe feed system. Among these four frequencies two frequencies 2.62 GHz and 5.82 GHz lies in lower and upper frequency band respectively of Wi-Max application created by IEEE 802.16 working group....
In this paper we propose polling based uplink scheduling schemes for TCP based applications in a multipoint- to-point fixed broadband IEEE 802.16 network. Our schemes adapt the transmission rates between subscriber stations (SSs) and the base station (BS) dynamically using adaptive modulation. We ensure fairness among the SSs via a credit-based approach in which an SS that misses a chance to transmit...
We consider the problem of centralized routing and scheduling for IEEE 802.16 mesh networks so as to provide Quality of Service (QoS) to individual real and interactive data applications. We first obtain an optimal and fair routing and scheduling policy for aggregate demands for different source- destination pairs. We then present scheduling algorithms which provide per flow QoS guarantees while utilizing...
IEEE 802.16 standards for wireless metropolitan area networks (WMANs) include a mesh mode of operation for improving the coverage and throughput of the network. In this paper, we consider the problem of routing and centralized scheduling for such networks. We first fix the routing, which reduces the network to a tree. We then present a finite horizon dynamic programming framework. Using it we obtain...
We analyze the delay performance of multi-channel MAC in point-to-multipoint wireless networks. We focus on contention based operation of nodes in such networks using a multi-channel MAC protocol adapted from Jungmin So et al., (2004). Our analysis can be extended to IEEE 802.11 DCF in PMP mode of operation and contention based IEEE 802.16 based networks. Using a slotted-time model, we derive expressions...
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