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We compare the performance of two real-time multimedia communication systems for quality versus end-to-end delay. We develop an analytical framework for comparison when the systems use a deterministic time-varying channel. Moreover, we assess their performance for the Gilbert-Elliott channel model which alternates between a good and a bad state with time durations that are exponentially distributed...
As mobile phones increasingly become the target of propagating malware, their use of direct pair-wise communication mechanisms, such as Bluetooth and WiFi, pose considerable challenges to malware detection and mitigation. Unlike malware that propagates using the network, where the provider can employ centralized defenses, proximity malware can propagate in an entirely distributed fashion. In this...
Multiple-input multiple-output (MIMO) systems operating at frequencies in the upper VHF and lower UHF region is attractive for peer-to-peer communication applications where robustness is of high importance, e.g., in tactical networks and emergency response systems. When designing and evaluating such systems, knowledge of realistic propagation conditions is required. This paper presents results from...
The mass casualty emergency response involves logistic impediments like overflowing victims, paper triaging, extended victim wait time and transport. We propose a new system based on a location aware wireless sensor network (WSN) to overcome these impediments and assist the emergency responders (ER) in providing efficient emergency response during disasters like chemical explosions. In this paper...
A single-chip transceiver for worldwide multi-class UHF RFID readers integrates all RF and analog baseband blocks, a synthesizer, DeltaSigma DACs and ADCs, digital filters and modem functions. The output power is up to +20dBm. Sensitivities down to -85dBm can be achieved in the presence of a 0dBm self-jammer. Total power consumption is 1.5W.
The proliferation of RFID applications motivates an integrated solution to reduce the cost and physical size of readers. This paper describes the architecture and design of a world-wide regulation-compliant single-chip RFID transceiver for multiclass tags. Based on direct-conversion architecture, this chip integrates all of the RF blocks, synthesizer, analog signal conditioning, ADC/ DAC, and modulation...
A single-chip transceiver for wireless digital audio applications is realized in a 0.25 /spl mu/m BiCMOS process. To avoid the congested 2.4 GHz band and to achieve better penetration through walls, 863 and 915 MHz bands are adopted. The frame structure used in this design guarantees a low latency for streaming audio. Adaptive frequency hopping and antenna diversity ensure robust link management.
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