Coolpad (China)

Passive Optical Networks (PON) have advantages such as stable performance, convenient installation, high bandwidth, and resource saving, making them a mainstream network access technology with broad application prospects. The development of such as 8K video, digital twins, VR and other technologies causes explosive growth of network traffic and drives the next generation of PON to evolve towards higher rates, which results in the use of forward error correction (FEC) coding with higher coding gain to improve the power budget of PON. Quasi-cyclic low density parity check (QC-LDPC) codes are widely utilized in PON systems due to high coding gain and parallel encoding and decoding capabilities. However, the application of turbo-decode message passing (TDMP) decoding method is inevitably equated with high hardware complexity of the decoder caused by storing and processing massive information, which is one of the obstacles to PON evolution. Reducing the quantization word length is effective to reduce hardware complexity, but it also leads to saturation of decoding information, causing errors and affecting decoding performance. This work proposes an nonlinear mapping method which utilizes adaptive compression of decoding information through node saturation state monitoring during the decoding process, in order to ensure that the probability density of node information has a reasonable distribution. The simulation results indicate that the method can effectively mitigate the decline in decoding performance under low-word-length conditions.

Abstract A complete and accurate statistical analysis of cases of contraction with SARS-CoV-2 are given under the conditions of strict mandatory quarantine and isolation and of a high rate of full vaccination. SARS-CoV-2 is still new, and little is known about either its direction of variation or its propagation laws. China has been attacked by its largest outbreaks of COVID-19 since March. Pervasive arguments arose among people in China and around the world. Here we reveal the essential reasons why China has been and will be adhering to its “dynamic zero-COVID policy” which stands in contrast to a global trend towards easing restrictions and attempting to co-exist with the circulating virus, including the choice uniqueness, morbidity differences in different cities, unpredictability, worries of sudden impact to medical system, successful reducing to zero the number of each active chain of transmission and outstanding economy achievements, etc. This study provides first-hand valuable information for further research on similar epidemics in the future. It may bring new thoughts for correction of present epidemiological theory and mathematical models, as well as new theoretical supports for the prevention policy making. It may also give other countries time to be better prepared for the coming 6th wave driven by Omicron BA.2.

A Complementary Low‐temperature Poly‐Crystalline Silicon and Oxide (LTPO) technology based on p‐type Low‐temperature Poly‐Crystalline Silicon (LTPS) and n‐type oxide Thin‐Film Transistors (TFTs) was developed and demonstrated. New pixel circuits and Gate‐on‐Array (GOA) circuits were designed and fabricated using this technology. By combining the superior driving capability of LTPS and ultra‐low leakage of oxide semiconductor, all the pixel circuits and GOA circuits can operate between 1 Hz and 120 Hz, which enables both high refresh rate and low standby power display applications.

A compact wide-band antipodal Vivaldi antenna (AVA) is designed in this work. First, the traditional exponentially tapered edge of the radiator is replaced by an arc curve that makes the AVA compact. Second, the AVA is loaded with a “director” and a “convex lens” that improve its high-frequency performance. The proposed antenna is fabricated and its dimensions measured. It occupies a small volume of 34 × 16 × 0.8 mm3 and provides an operating frequency range from 3.01 to 10.6 GHz with a higher gain in the low frequency region than that of reference antennas. The measured results perfectly coincide with the simulated ones, which demonstrates the feasibility of the novel AVA design.

Deployment of Long Term Evolution (LTE) on unlicensed bands has been discussed recently in the 3rd Generation Partnership Project (3GPP) Release 13, which is also called LTE Licensed-Assisted Access (LAA) to unlicensed bands. Due to the unlicensed feature, other systems such as Wi-Fi and radar would operate on these bands. In order to avoid the interference, some management mechanism needs to be considered. In this paper, we propose a novel approach in interference detection, introduce DFS in UE and make the implementation of DFS both in BS and UE. Furthermore, the performance of LAA is studied via a detailed system level simulate with 3GPP simulation parameters and test scenarios. The Simulation results show that DFS in BS can obtain the higher gain in throughput and latency.