Abstract
This work concerns the receiver design for light emitting diode (LED) communications, where the LED nonlinearity can severely degrade the system performance. The LED nonlinearity makes high speed LED communications more challenging when it is time-varying (e.g., due to temperature drifting) and/or combined with time-varying channels (due to the relative movement between the transmitter and the receiver). In this work, we use adaptive neural network techniques to address this issue. We first propose a new adaptive extreme learning machine (AELM) with a variable forgetting factor for adaptive learning in dynamic scenarios. Then, an AELM based (turbo) receiver is designed to handle the time-varying LED nonlinearity and memory effects jointly. It is demonstrated that the proposed AELM based receiver can efficiently mitigate the dynamic nonlinearity and memory effects, and outperform the state-of-the-art adaptive techniques significantly.
Abstract
Visible light communications (VLC) employ visible light for communication within the frequency spectrum from 430 THz to 790 THz. The ultra-wide bandwidth resolves the spectrum exhaustion in radio frequency communications. Light-fidelity (LiFi) takes VLC further to achieve high speed, bi-directional and fully networked wireless communications. Light-emitting diode (LED) is the major light source employed by LiFi as LED is energy efficient for illumination, and at the same time can achieve high speed data transmission thanks to the LED fast switching capability. Now, LED communications, one of the major application scenarios of LiFi, have attracted huge attention and research interests. A variety of advantages are offered including the unregulated wide bandwidth, energy efficiency, safety, etc., which makes LED communications a promising supplement to the fifth generation (5G) communications. LED is the major source of nonlinearity in LED communications and LED also exhibits
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Elections for two positions on the Gloucester Township Fire District No. 5 take place April 20. (Patch Graphics)
GLOUCESTER TOWNSHIP, NJ While candidates are lining up to run for mayor and council in Gloucester Township, there is another election taking place next week. Fire district elections take place on Tuesday, April 20.
Gerard Sprinitis and Dan Carosiello are running for the board of commissioners in District 5, where voting will take place from 2 p.m. to 9 p.m. at Gloucester Township Fire District #5, 1781 Sicklerville Road in Sicklerville. They submitted the following information about their candidacies:
The Lambs Terrace Fire Company is a combination Career and Volunteer department which serves the southern end of town. We are two individuals who truly care about our community and feel we can contribute positive changes within the district. Families and neighbors need the assurance that their firehouse is running proficiently, allocation of funds are being procu
linkedin V-Mart has appointed Poppy Seed Communications to handle its branding and creative strategy across traditional and digital media. The Delhi-based start-up won the account after a presentation made to the brand for its strategy for the future. Poppy Seed Communications has been founded by Ashwani Dhingra. V-Mart Retail was founded in 2002. The retail chain offers a range of apparel, footwear and accessories for women, men and kids. It also offers home furnishing, merchandise, and home utility items. Vineet Jain, COO, V-Mart Retail, said, Poppy Seed, though is a recently born agency, it is led by competent professionals with extensive experience, that is just what is needed. The brand is very positive about this alliance and is all set to uncover what the agency’s expertise has in store, for the 19-years old fashion retail chain.
what happens next. saudi arabia claims that the crown prince, known as mbs, knew nothing about any of this. but according to the new york times, the cia is convinced mbs is culpable in mr. khashoggi s death. the nsa on the other hand reportedly collected smoo eed communications of saudi officials discussing a plan to lure mr. khashoggi back to saudi arabia and detain him. the times say it does not reveal whether mbs directly ordered the killing of mr. khashoggi. and then there is what s happening in congress. we re learning the trump administration, quote, clamped down on sharing any intelligence surrounding the khashoggi case earlier this week, including cancelling an intel briefing for members of congress. senate foreign relations chairman bob corker said he was told no additional intelligence would be shared with the senate for now. so that s where we standing, with the saudi government