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A novel structure for an analog linear variable gain amplifier (VGA) fabricated in CMOS 0.35μm technology is proposed in this paper. In order to increase noise performance and linearity, the VGA is designed based on differential topology. The pseudo-exponential gain is altered following the control of a current source supplied to a differential source-coupled pair with diode-connected loads. This...
In wireless multimedia sensor networks (WMSNs), multimedia contents from remote areas are captured by camera sensors (CSs) and sent to data center via cluster heads (CHs) and base stations (BSs) for the purpose of monitoring. The problem in WMSNs is that enabling multimedia streaming, e.g., video streaming, demands high quality and consumes considerable bandwidth and energy resources, meanwhile, the...
In HTTP adaptive streaming, the length of each video segment is not strictly specified; choosing segment duration is an implementation-specific decision. In this paper, we evaluate the effects of segment duration to video streaming performance in various network conditions. By carrying out experiments we realize that the choice of segment duration has a profound impact on several aspects including...
This paper studies the delay-quality tradeoff of variable bitrate (VBR) videos in multi-bitrate adaptive streaming. A novel method is presented that provides an adapted video with the best possible quality while still meeting the constraints of bandwidth and delay.
Cache compression has largely focused on improving single-stream application performance. In contrast, this work proposes utilizing cache compression to improve application throughput for manycore processors while potentially harming single-stream performance. The growing interest in throughput-oriented manycore architectures and widening disparity between on-chip resources and off-chip bandwidth...
Mobile WiMAX is a promising broadband access technology providing wireless last mile connectivity. In the Time Division Duplex (TDD) mode, a WiMAX frame is divided into two parts: downlink and uplink subframes. The subframe division ratio is normally set to a fixed value, resulting in under-utilization of the downlink or uplink subframes. In this paper, we propose a dynamic downlink and uplink subframe...
Fresnel beamforming is a beamforming method that has a delay profile with a shape similar to a physical Fresnel lens. With 4-8 transmit channels, 2 receive channels and a network of single-pole/single-throw switches, Fresnel beamforming can reduce the size, cost and complexity of a beamformer. The performance of Fresnel beamforming is highly dependent on focal errors due to phase wraparound and quantization...
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