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Author: search.filters.author.Choomchuay, SomsakSubject: search.filters.subject.WBAN

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    An Investigation of UWB Path Loss for Body Area Network
    (2018-12-24)
    Sansoda, Buncha
    ;
    Choomchuay, Somsak
    This paper presents the investigation of body area communication channel and provide path loss evaluation by measurement compared with channel model of IEEE 802.15.6 standard. The measurement performs in ultra-wideband frequency range and setup the body in different body poster. The receive antenna is mounted on waist while transmit antenna is placed on wrist and ankle. We found trend of path loss similar as model. The results shows that transmission between the two antenna are highly attenuated when the radio wave propagates across the body. However, if the wave direction propagates along the body as waist to ankle, the path loss would slowly increase. Thus the suitable position of antenna would certainly be important with measurement result to reduce the body effect.
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    Performance evaluation of concatenated coding with diversity reception for body area network
    (2016-03-11)
    Sansoda, Buncha
    ;
    Choomchuay, Somsak
    In wireless communication, it is of significance that the receiving information should be identical to the transmitted information. With this regards, an application of error correction coding (ECC) is one suitable method for maintaining the information precision between the transmission channels. With similar objectives, the diversity techniques are used to moderate the devaluation in the error performance due to the fading impairment by using multiple communication branches. This paper, we propose the application of concatenate codes combined with space diversity technique as maximal ratio combining. We focused on the bit error rate (BER) performance and the impact of Rician fading channel on wireless body area network (WBAN). The finding shows that the proposed scheme can provide considerable improvement on the BER performance compared with that of the traditional system. The concatenate code with MRC outperformed conventional ones, either RS or convolutional codes. At 10-4 of BER, the designed scheme is better than RS code by1.3 dB and convolutional code by2.2dB.
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    An application of rate-adaptive RS-codes in wireless Body Area Network
    (2015-08-17)
    Khattiya, Wannarit
    ;
    Choomchuay, Somsak
    This paper proposes the preliminary investigation of rate adaptive error correction coding applied to MAC layer of Body Area Network (WBAN). Health monitoring is a crucial part of proactive patient treatment. As a nature to WBAN communication, there appears severe noise level surrounding the human body. The transmission quality is deterred according to the present of noise. The issue can be improved by appending Error Correction Code (ECC) to the communication message. However, such an effort can cause the packet overhead, latency, and more energy consumption. To mitigate these disadvantages, the rate adaptive of ECC is proposed. The Reed-Solomon (RS) code designed in GF256 has been employed in this study. It fits well the maximum MAC length which is 255 bytes. In our investigation, several MIT-BIH Arrhythmia databases are chosen as input data to represent the patient monitoring condition. The Rician fading channel model is involved as its quite nature to WBAN characteristic. The codes performances are measured in Bit Error Rate (BER) and energy consumption unit.
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    Performance evaluation of error correction code in MIMO scheme for WBAN channel
    (2014-01-27)
    Sansoda, Buncha
    ;
    Choomchuay, Somsak
    In most communications, the error correction code (ECC) is one good solution to maintaining the information accuracy between the transmitter and the receiver. Multiple-input-multiple-output (MIMO) technology is further adopted to increase the link quality and capacity for the same transmission power. This paper proposes the application of convolutional code (CC) combined with MIMO scheme to reduce the bit error probability in WBAN channel where binary Phase Shift Keying (BPSK) is assumed in channel modulation. The findings show that the combination scheme performs better than the conventional scheme particularly when the constraint length is increases.