KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Settings

Access type: UnknownSubject: search.filters.subject.Gaussian pulse

Search Results

Now showing 1 - 3 of 3
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Optimized Gaussian Pulse Design for UWB System Using Particle Swarm Optimization Based-on Generalized Bessel Polynomials
    (2022-01-01)
    Chutchavong, Vanvisa
    ;
    Anuwongpinit, Thanavit
    ;
    Purahong, Boonchana
    ;
    Archevapanich, Tuanjai
    ;
    Janchitrapongvej, Kanok
    The ultrawideband system operates a very short pulse with enormous bandwidth to provide high data rates for data transmission. To design the UWB pulse, considering the pulse shape is very necessary, and a spectral emission mask of the designed pulse should meet the FCC spectral mask requirement between frequency range 3.1 GHz to 10.6 GHz. The traditional UWB pulse design is based on the Gaussian derivative. However, the frequency spectrum is not satisfied the FCC spectral mask requirement. In this study, the Gaussian pulse can be designed from the mathematical characteristic of the generalized Bessel polynomial. The spectral efficiency of the proposed pulse can be improved by the combination of the derivative of Gaussian pulse with a weight coefficient optimization with particle swarm optimization (PSO). PSO is a population-based optimization algorithm inspired by animal behavior. PSO is applied with generalized Bessel polynomial transfer function to gain the best weight coefficient, we proposed to optimize its weight vector to design a pulse that exceeds to FCC spectral mask. The results were found in MATLAB software show that generalized Bessel polynomials can approximate the proposed pulse with combination method and PSO. The spectral efficiency is improved to 89.30% and the spectrum is greater close to the FCC spectral mask requirement. To confirm an improved spectral efficiency compared to the previous works.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Molecular transistor manipulation controlled by light within a PANDA microring resonator
    (2011-12-01)
    Panruansan, C.
    ;
    Mitatha, S.
    ;
    Yupapin, P. P.
    A novel design of Molecular Transistor using a microring resonator called a PANDA microring resonator is proposed. A molecular transistor can control its output in proportion to the input signal; that is, it can act as an amplifier. Alternatively, it can be used to turn current on or off in a circuit as an electrically controlled switch. By using the optic tweezers, the trapped molecule can be used to form in the same way of photonic transistor, in which the increasing in magnitude of force can increase the trapped molecules. The trapping probe can be adjusted to fit for the molecules size of 10 nm to 15 nm by control ring's parameters. The molecules can be transport at the through port and storage at the drop port. In application, the number of molecules can be controlled to perform the constant and amplification characteristics, which will be suitable for molecular transistor performance. © 2011 IEEE.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    A 0.18 μm CMOS Gaussian monocycle pulse circuit design for UWB
    (2006-12-01)
    Hidayat, Risanuri
    ;
    Dejhart, Kobchai
    ;
    Moungnoul, Phichet
    ;
    Miyanaga, Yohikazu
    This paper proposes a new method of monocycle pulse generation by generating the Gaussian pulse, and generate first derivative of the pulse to get a Scholtz's monocycle pulse. The simulation result of the generation is based on 0.18 μn CMOS technology which achieved using HSPICE (Level 49). The Gaussian pulse is generated by using CMOS inverter of which is applied the delay time to perform the Gaussian pulse. ©2006 IEEE.