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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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A non-binary LDPC Code in WBAN: Patterned data transmission
(2016-01-25)
Timakul, Sekson
;
Sansoda, Buncha
;
Choomchuay, Somsak
This paper details the application of a PEG originated non-binary LDPC codes designed to fit the pay load size of MAC frame of IEEE 802.15.6 Wireless Body Area Network. The resulted codes are with the block size is 255 bytes. Codes with the rate of 0.5 and 0.9 are investigated for their performance. The symbol error rate and block error rate performance given by the system simulation has confirmed that the non-binary LDPC code can yield better performance when compared with hard decision Reed Solomon codes.
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Performance evaluation of LDPC codes on patterned WBAN data
(2015-01-26)
Sansoda, Buncha
;
Choomchuay, Somak
;
Timakul, Sekson
;
Khattiya, Wannarit
In this decade, WBAN plays vital role in health care monitoring environment. It has been used more intensively in wider applications. This paper proposes error control coding applied to WBAN. LDPC codes with the block size of 255 bytes are particularly of interest. Patterned information such as MIT-BIH's arrhythmia datasets extracted from Electrocardiography (ECG) of the patients who encountered heart disease. To measure the system performance, random data are also examined. The system was simulated on Rician channel where severe noise are quite nature to WBAN compared to AWGN channel. Rician channel with some K-factors was investigated. The obtained result shows that both patterned data and random data can be recovered well when Eb/N0 equals 3 dB and above. While the code rates were made varied from 0.50 to 0.75, we can obtain the gain of 3 dB, 5 dB, and 6 dB respectively.
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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.
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Performance evaluation of concatenate coding for body area network applications
(2014-01-01)
Sansoda, Buncha
;
Choomchuay, Somsak
In digital communications, since it is of importance that the receiving data is identical to the transmitted data, the error correcting code is one good solution to maintaining the information accuracy between the transmitter and the receiver. This research paper proposes the application of the error correcting code to Wireless Body Area Network (WBAN). The error correcting code in this research work is the concatenate code of the Reed-Solomon code (RS) and the convolutional code (CC). Information data in WBAN with the Rician channel condition is modulated with the Binary Phase Shift Keying (BPSK) scheme. In addition, the path loss of WBAN is examined. The Additive White Gaussian Noise (AWGN) and Rayleigh fading channels are employed for comparison purposes to illustrate the effects on bit error performance of different channel environments. The RS code is an outer code while the convolutional code an inner code. The findings show that the concatenate code performs better than the single codes, i.e. RS and CC. At BER 10<sup>-3</sup>, the concatenate code {RS(255,223)+CC(171,133)} is better than either RS(255,223) at 5dB or CC(171,133) at 1.5dB. If the inner code is changed to CC(7,5) at BER 10<sup>-3</sup>, the performance is reduced by approximately 0.6dB. Thus, the coding complexity can be tailored according to the desired error correcting capability. © (2014) Trans Tech Publications, Switzerland.
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Performance comparison of convolutional codes for UWB-WBAN applications
(2013-12-01)
Sansoda, Buncha
;
Khattiya, Wannarit
;
Choomchuay, Somsak
A wireless body area network is a radio-frequency-based wireless networking technology that interconnects tiny nodes with sensor or actuator capabilities in, on, or around a human body. WBANs provide promising applications in medical monitoring systems to measure specified physiological data and also provide location-based information, if required. This paper we propose the preliminary investigation of the application of error control code to MAC layer data. Convolutional codes and punctured codes have been considered. The punctured codes are used to step up the code rate from its mother code rate. In our investigation, ECG data from MIT-BIH Arrhythmia databases are chosen as input data. The coding performance comparison is selected to various parameters such as constrain length and code rate. The result will be a compromise between errors correcting capability and needed to reduce the number of data bits in the channel. © 2013 IEEE.

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