White Rabbit Multi-Point Time Distribution Network

A nanosecond-accuracy, scalable, multi-point time- and frequency dissemination has been set up in an existing DWDM optical fiber network spanning approximately 200 km, using the White Rabbit (WR) Precision Time Protocol (PTP). Presented novelties in this paper are: a performance study of 5 cascaded WR switches allowing a wide fan-out; reference delay compensation ensuring that the time received by the user is synchronized with the reference timescale within a few nanosecond offset; experiments with a master clock priority algorithm for redundant operation and experimental results of hold-over performance.

White Rabbit Multi-Point Time Distribution Network

A nanosecond-accuracy, scalable, multi-point time- and frequency dissemination has been set up in an existing DWDM optical fiber network spanning approximately 200 km, using the White Rabbit (WR) Precision Time Protocol (PTP). Presented novelties in this paper are: a performance study of 5 cascaded WR switches allowing a wide fan-out; reference delay compensation ensuring that the time received by the user is synchronized with the reference timescale within a few nanosecond offset; experiments with a master clock priority algorithm for redundant operation and experimental results of hold-over performance.

Research on underwater image enhancement algorithm based on improved DCP

All for underwater images, there are some drawbacks, such as low definition, serious color bias, dark brightness, etc. On the basis of in-depth analysis of common image enhancement algorithms, This paper uses the improved dark channel priority algorithm to enhance the underwater image, Improving the contrast of underwater images and color correction of underwater images. Color correction is added based on dark channel prior algorithm; Make the image look more even, higher contrast, more acceptable. The improved algorithm model has a higher transfer rate; PSNR is more balanced and has better contrast to meet the requirements of underwater image observation.

An Adaptive Arbitration Technique with 4x4 Mesh Topology for Low Area and High Speed NOC Design

In recent days, On-Chip Communication is a major requirement in modern systems that produce efficient communication with less complexity and high throughput. Due to heavy traffic and increasing Network-On Chip (NoC) size, the routing algorithm produces poor performances. Normally, round-robin and matrix arbiters are used in NoC for high-speed switches. In this research work, three different types of arbiter algorithms are used such as priority algorithm, Time Division Multiplexed (TDM) algorithm, and Viterbi algorithm to improve the linearity of the NOC. Initially, the priority algorithm helps to minimize traffic congestion when the arbiter is in a busy mode. Second, the fairness and Quality of Service (QoS) of the NoC structure are analyzed by the TDM algorithm. Finally, the Viterbi algorithm based error prediction process is done in an NoC structure. Due to the usage of three proposed arbiter algorithms, the area of NoC can be reduced. The packet can be reached to the destination by using the arbitration process with less loss. In this research, the proposed methodology is called as Low AreaFault-Tolerant Adaptive Arbitration based NoC architecture (LAFTAA- NoC architecture). Finally, the Field Programmable Gate Array (FPGA) performance is evaluated such as LUT, flip flop, slices, and frequency in Spartan 6 hardware. In the proposed method, 2.42% of LUT, 3.1% of flip flop, and 8.63% of slices have reduced when compared to existing work.