排序方式: 共有33条查询结果,搜索用时 15 毫秒
31.
In this paper we propose a novel semiblind scheme based on second and fourth order statistics of Space–Time data in time varying
MIMO channels. This scheme combines a new blind estimator of frequency offsets and an iterative decoder. Space–Time Codes
have a periodic property which is used to find a simple and efficient blind estimator of carrier offsets. The iterative decoder
is a data aided decoder which provides the best estimates of channel, noise co-variance and S–T data in its category. As a
result of this the new semiblind scheme performs very efficiently in time-selective channels and is able to reduce the training
overhead required by the data-aided estimators to a large extent, and increase the effective throughput.
相似文献
Manav R. BhatnagarEmail: |
32.
Sayali Ashok Patil Pallavi Bhaktapralhad Jagdale Ashish Singh Ravindra Vikram Singh Ziyauddin Khan Akshaya Kumar Samal Manav Saxena 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(14):2206063
Zinc oxide (ZnO) is a thermally stable n-type semiconducting material. ZnO 2D nanosheets have mainly gained substantial attention due to their unique properties, such as direct bandgap and strong excitonic binding energy at room temperature. These are widely utilized in piezotronics, energy storage, photodetectors, light-emitting diodes, solar cells, gas sensors, and photocatalysis. Notably, the chemical properties and performances of ZnO nanosheets largely depend on the nano-structuring that can be regulated and controlled through modulating synthetic strategies. Two synthetic approaches, top–down and bottom–up, are mainly employed for preparing ZnO 2D nanomaterials. However, owing to better results in producing defect-free nanostructures, homogenous chemical composition, etc., the bottom–up approach is extensively used compared to the top–down method for preparing ZnO 2D nanosheets. This review presents a comprehensive study on designing and developing 2D ZnO nanomaterials, followed by accenting its potential applications. To begin with, various synthetic strategies and attributes of ZnO 2D nanosheets are discussed, followed by focusing on methodologies and reaction mechanisms. Then, their deliberation toward batteries, supercapacitors, electronics/optoelectronics, photocatalysis, sensing, and piezoelectronic platforms are further discussed. Finally, the challenges and future opportunities are featured based on its current development. 相似文献
33.
Certain cancers exhibit upregulation of DNA interstrand crosslink repair pathways, which contributes to resistance to crosslinking chemotherapy drugs and poor prognoses. Inhibition of enzymes implicated in interstrand crosslink repair is therefore a promising strategy for improving the efficacy of cancer treatment. One such target enzyme is SNM1A, a zinc co-ordinating 5’–3’ exonuclease. Previous studies have demonstrated the feasibility of inhibiting SNM1A using modified nucleosides appended with zinc-binding groups. In this work, we sought to develop more effective SNM1A inhibitors by exploiting interactions with the phosphate-binding pocket adjacent to the enzyme's active site, in addition to the catalytic zinc ions. A series of nucleoside derivatives bearing phosphate moieties at the 5’-position, as well as zinc-binding groups at the 3’-position, were prepared and tested in gel-electrophoresis and real-time fluorescence assays. As well as investigating novel zinc-binding groups, we found that incorporation of a 5’-phosphate dramatically increased the potency of the inhibitors. 相似文献