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The conventional differential phase shifter configurations usually require different reference lines to provide constant phase shifts over a certain bandwidth. This results in high design complexity, especially for the multiway and poly-phase applications. To solve this problem effectively, a new differential phase shifter configuration based on the parallel stubs loaded transmission line is proposed...
Software-Defined Networking (SDN) is an emerging network architecture that enables network programmability. Recent research activities on SDN make it important to develop an emulator that accurately emulates OpenFlow-enabled SDN networks. However, existing emulators and simulators focus on either data plane performance or software switches. This motivates us to develop a network emulator that provides...
The relative timing between the injection and slave pulses is found to be the key factor to achieve sub-fs timing jitter (0.87 fs, 1.9 MHz bandwidth) between Yb-fiber and Er-fiber fs lasers with hybrid synchronization.
We present an "opportunistic" scheduling policy with the objective of improving delay performance for time-sensitive users in wireless networks. Since packet delay depends on both resource allocation and time-varying capacity of wireless channels, we introduce a search radius (SR) into the framework of packet fair queueing (PFQ) and employ maximum relative SNR (Max-rSNR) as scheduling rule...
A QoS constrained scheduling framework is presented and evaluated for VoIP traffic. QoS factors such as frame error rate, delay, codec related quality factors are added to the proportional fair scheduler in different manners to enhance the scheduler support for real-time traffic, like VoIP. Simulations show that the new scheduler improves the link level quality/fairness and the system capacity.
A new rate adaptation protocol EARF (enhanced ARF) is proposed for IEEE 802.11 based on ACK frame statistical information. The main idea is to assign each transmission rate a unique success threshold, which is controlled by a delay factor to quantify the responsiveness of a link adaptation, and dynamically updated along with channel condition. The proposed protocol needs no modification to the current...
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