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This paper proposes an experimental design of an asymmetric Y-shaped slit loaded microstrip antenna (MSA) which can yield wider bandwidth in dual-band applications in wireless communication. The antenna consists of a rectangular patch with four asymmetric Y-shaped slits at the patch corners and a double thickness of FR4 substrate. The experimental results show that the bandwidths are increased up...
This paper describes the design and implementation of a 2.4-GHz fully-differential logarithmic amplifier for RF signal power detection. A novel self-bias wideband amplifier without on-chip inductor is employed as a limiting amplifier stage. The proposed logarithmic amplifier is realized and fabricated in a 0.35-mum CMOS technology. Measurement results showed that the circuit achieved 43-dB voltage...
This paper presents microstrip-fed slot antenna with rectangular-shaped tuning stub for WLAN application. The characteristics of antenna are proposed and analyzed for instance return loss, bandwidth, and far field radiation patterns. The measured results of the impedance matching for the proposed antenna show the impedance bandwidth, determined by -10 dB return loss, larger than 104% (2.0-6.35 GHz)...
Recently, SLAs become an important issue considered in the next generation telecommunication services. The subscriberspsilas perspective drives ISPs eager to support their requirements by offering SLAs across domains. Under deregulatory environment, this paper has adopted a path-classification scheme in order to capture the freedom of policy selection. To prevent selfish path provisioning in the interdomain...
This paper concerns an approach for solving multi-objective analog circuit design problems, which is based on formulating the problem as a geometric program (GP). Multiple objectives are combined into a scalar objective thru certain convex functions and thus can be solved using GP. In contrast to single-objective optimization, simultaneous consideration of all objectives yields a compromising solution...
The fundamental characteristics of VoIP are constant rate, delay sensitivity, and loss tolerance. VoIP over packet-switched networks including the Internet poses problems because the network service is not guaranteed to meet such requirements, i.e. the available bandwidth as well as the delay and loss bounds. Adaptive rate VoIP is a solution that can mitigate the problem. Adaptive rate VoIP has the...
A co-allocation strategy in data grids uses parallel data transfer from multiple servers to improve the transfer completion time. A co-allocation strategy has good performance when every available server can fully utilize the connection between the server and the client to transfer data. In existing co-allocation strategies, the time which is not spent in data transmission is constituted of (1) the...
Multicast-encouraging explicit rate adjustment (MeERA) and packet-pair receiver-driven cumulative layer multicast (PLM) are two of the recently proposed receiver-driven layered multicast congestion control protocols. Both have used explicit rate adjustment techniques in detecting and controlling congestion. Both have also been evaluated by their authors and claim a few advances. However, there is...
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