KMITL

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

Browse

Settings

Author: search.filters.author.Manyanon, A.

Search Results

Now showing 1 - 4 of 4
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Indirect detection of multi-wave length for infrared wireless communications in the room and public area services
    (2003-01-01)
    Sudkaew, S.
    ;
    Sartthong, J.
    ;
    Noppanakeepong, S.
    ;
    Manyanon, A.
    In this paper, optical multi-wavelength modulation is proposed to reduce the effects of intersymbol interference (ISI) on the artificial light noise and multi path channels. The noise model in the room is the Additive White Gaussian Noise (AWGN), and multi wavelength optical modulation schemes are used for On Off Keying (OOK). An infrareds link in the room or public area services used Intensity Modulation and Direct Detection ( MD ). The normal room and some interior in this case are used to study the obstruction and the reflex effect to the communications speed rate at 10-100Mbps. Finally each performance of BER per Transmitted light power of Multi-wavelength Infiared system is compared. The carrier characteristic of Multi-wavelength wiIl be improved to be same as RF- carriers on mobiles applications.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Analysis performance of L-PPM infrared wireless communications for indoor LOS and diffuse links.
    (2003-01-01)
    Sartthong, J.
    ;
    Wonghoon, S.
    ;
    Noppahceepong, S.
    ;
    Manyanon, A.
    In this paper, we present the efficiency and performance of Pulse Position Modulation (L-PPM) for indoor wireless infrared communication system. By physical characteristic of infrared channels using intensity modulation with direct detection (IM/DD). Noise in the channel .wilt be considered as Additive White Gaussian Noise. We evaluate power and 'bandwidth efficiency compared with On Off Keying (OOK). We have computed the path loss versus horizontal separation between transmitter and receiver in LOS and D i m e lmk, and our results show the best average power efficiency among the modulation techniques, which are presented for 2, 4, 8, 16, 32, and 64 PPM at bit rates of 10 Mb/s to 100 Mb/s, Finally, we present Monte Carlo Simulation results to Bit Error Probability and the best Signal to Noise Ratio that LPulse Position Modulation requirement.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Analysis performance of L-PPM infrared wireless communications for indoor LOS and diffuse links
    (2003-01-01)
    Sahthong, J.
    ;
    Wonghoori, S.
    ;
    Noppanakeepong, S.
    ;
    Manyanon, A.
    In this paper, we present the efficiency and performance of Pulse Position Modulation (L-PPM) for indoor wireless infrared communication system. By physical characteristic of mfrared channels using intensity modulation with direct detection (IMIDD). Noise in the channel will be considered as Additive - White Gaussian Noise. We evaluate power and bandwidth efficiency compared with On Off Keying (OOK). We have computed the path loss versus horizontal separation between transmitter and receiver in LOS and Diffise link, and our results show the best average . power efficiency among the modulation techniques, which art presented for 2, 4, 8, 16, 32, and 64 PPM at bit rates of 10 Mb/s to 100 Mb/s. Finally, we present Monte Carlo Simulation results to Bit Error Probability and the best Signal to Noise Ratio that LPulse Position Modulation requirement.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Effect of multipath fading on the Erlang capacity of imperfect power control in cellular CDMA system
    (2002-01-01)
    Omsin, S.
    ;
    Manyanon, A.
    ;
    Kimpan, C.
    ;
    Pin-Ngern, O.
    ;
    Noppanakeepong, S.
    This paper presents an approach to the evaluation of the reverse link capacity of a cellular CDMA system, which is based on using Gaussian and lognormal approximations. We include the fading channel multipath intensity profile (MIP) shape factor in the Erlang capacity formula. Imperfect power control and Rayleigh multipath fading channels are considered.