Jamjareegulgarn, Punyawi
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Preferred name
Jamjareegulgarn, Punyawi
Alternative Name
Jamjareegulgarn, P.
Main Affiliation
Email
punyawi.ja@kmitl.ac.th
18 results
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Item type:Publication, Detection of data symbol in a massive MIMO systems for 5G wireless communication(2017-10-19); The massive MIMO technique has played the most important role in 5G wireless communication. It is anticipated that the new techniques employed in massive MIMO will not only improve peak service data rates significantly, but also enhance capacity, coverage, low-latency, efficiency flexibility, compatibility and convergence, thus meeting the focusing demands imposed by optimal detection. This paper presents the optimal detection of data symbol in massive MIMO for 5G wireless communication. Based on the frequency non-selective fading MIMO channel, we consider three difference detectors for recovering the transmitted data symbols and evaluate their performance for Rayleigh fading and additive white Gaussian noise (AWGN). At the results, we show that the probability of error rate (PER) performance of the detectors are significantly discussed. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Positioning Comparison Using GIM, Klobuchar, and IRI-2016 Models During the Geomagnetic Storm in 2021(2022-01-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Identifying Geomagnetic Storms with Ionospheric Storm Scale for GNSS and Disaster Prevention(2020-03-01); ; ; ; Tangtrakunphaisan, UdomsitThis paper proposes an ionospheric storm scale (I-scale) for identifying the impact of geomagnetic or ionospheric storms in the Ionosphere for GNSS (global navigation satellite system) service and disaster prevention. The I-scale in this work is computed based on the observed foF2 at Chumphon station (10.72°N, 99.37°E) over equatorial latitude from January 2004 to July 2018. The results report that the severe geomagnetic storms, i.e., IP3 and IN3, seldom occur at Chumphon with the probabilities of 0.02% and 0.07%, respectively. The probability of quiet ionospheric condition is the maximum value of 70.73%. Meanwhile, the other I-scales sometimes occur and range from 0.60% to 13.97%. The benefits of the foF2-based I-scale are to indicate the violence level of geomagnetic storms and to announce the ionospheric irregularities in practice. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Development of Geomatics Technology Curriculum for Associate Degree Programs within Project-Based Learning (PBL)(2025-01-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Statistical Analysis of Scintillation Index and ROTI based on Multi-GNSS Data at Chumphon, Thailand(2021-06-27); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Evaluating cooperative diversity-based WBAN by using STBC with pre-coding and relay selection(2014-01-01)The main objective of this paper is to evaluate the network performance of a cooperative diversity-based wireless body area network (WBAN) by using (2,2) Alamouti's space-time block code (STBC) with pre-coding scheme (STBC-PC) and a relay selection procedure (RSP). The considered WBAN model is served for healthcare service in order to mitigate the undesired effects of WBAN due to high path loss and fading as well as to keep a low transmit power while meeting to the desired WBAN quality of services. In this paper, the pre-coding scheme is taken to be employed in conjunction with the STBC, since a single antenna of each wireless sensor node in healthcare service can be exploited possibly as well as the high gain can still be achieved without loss of transmission rate. A channel model CM3 B is considered for computing the actual path loss of each WBAN link and the network performance is evaluated in terms of bit error rate (BER). The simulation results confirm that at each BER value, SNRs of STBC-PC without direct link (line-of-sight or LOS) scheme are the lowest which is compared with direct link, receive diversity and MRC, and (2,2) Alamouti's STBC. BER values of DQPSK-based STBC-PC are higher than those of DBPSK-based STBC-PC. Moreover, although any WBAN sensor nodes are chosen as a relay or any type of modulations are employed in STBC-PC with LOS, all of BER values have surprisingly the same trend. © 2014 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Analysis of Bottomside Thickness Parameter-Based TEC at Equatorial and Low Latitude Stations for Global Navigation Satellite Systems(2018-07-02); ; Tangtrakunphaisan, UdomsitThis paper studies the total electron content (TEC) at equatorial and low latitude stations which is computed using an equation of bottomside thickness parameter with correction factor (B2botP-new) during the solar maximum of 24th solar cycle. The computed TEC is used to compute the ionospheric time delay subsequent-tially. The ionospheric stations in this work include Ramey, Ascension Island, and Jicamarca. The results show that the diurnal and seasonal variations of B2botP-new have the same trends as that of B0-obs as well as the B2botP-new values are close to the BO-obs values clearly for all three stations. The electron density diffuses from the equator toward the EIA region (15°N and 15°S) during the period of 14-23 LT. The proposed TEC (TEC-P) are computed using the B2botP-new, and then the ionospheric delay is also computed using the TEC-P. The computed TEC-P and Id-P are close to the TEC-obs and Id-obs, but they should be further studied for a solar cycle (11 years). - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Performance evaluation for cooperative diversity-based wireless body area network(2013-01-01)This paper proposes cooperative diversity-based wireless body area network (WBAN) for healthcare service in order to mitigate the undesired effects of WBAN due to high path loss and fading as well as to keep a low transmit power while meeting to the desired WBAN quality of services, i.e., low outage probability and low bit error rate. In this paper, we consider all of the sensors which are placed on the human body, so CM3 B channel model is taken into account for computing the path loss of each WBAN link. Three well-known schemes for proactive relay selection have been addressed and applied in WBAN so as to compare the performance with the direct communication. The performance is evaluated in terms of outage probability (P<inf>out</inf>) and bit error rate (BER). The simulation results confirm that P<inf>out</inf> of cooperative diversity-based WBAN can be reduced higher 99.68% than that of direct communication at SNR of 0 dB and can be achieved below 4.5*10<sup>-4</sup> at the low SNR of 0 - 6 dB. Moreover, BER of cooperative diversity-based WBAN can also be significantly decreased higher 99.89% than that of direct communication at all SNRs of 0 - 10 dB. © 2013 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A new expression for computing topside scale height for satellite-based communications(2017-10-19); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A Study of Air Pollution Smart Sensors LPWAN via NB-IoT for Thailand Smart Cities 4.0(2018-08-06);