Abstract
The characterization of slow and fast fading in wireless body area networks with space diversity scheme has been presented. The analysis, based on the measurements at 2.45 GHz in an indoor environment, has shown that for all investigated configurations of receiving wearable antennas, the correlation coefficient values of the received signals’ parameters are below the assumed value of 0.5, being close to zero for the vast majority of cases. It has been shown that the slow fading component may be modelled by a lognormal distribution with zero average and the standard deviation from the range of [1.43, 1.98] dB. The fast fading component is the best modelled by a Rice distribution with the noncentrality parameter and the scale parameter being in the range [0.8125, 0.9624] and [0.5269, 0.6954], respectively.
Highlights
Nowadays, when the wireless body area networks (WBANs) become more and more popular, and the amount of the wearable sensors used by people are increasing, there is a need to model the radio channel around the human body with higher accuracy
The results of probability distribution functions (PDFs) fitting for the fast fading component are presented in Table 3(a) and Table 3(b)
It should be reminded that the χ2 test is passed when the value of χ2 statistics is below the critical value, and the lowest Akaike Information Criterion (AIC) value indicates the best-fitted PDF [15]
Summary
Nowadays, when the wireless body area networks (WBANs) become more and more popular, and the amount of the wearable sensors used by people are increasing, there is a need to model the radio channel around the human body with higher accuracy. The various diversity schemes, that can be used in off-body communications in WBANs, can significantly increase the quality of the received signals. This technique allows receiving uncorrelated replicas of the same radio signal and, in addition to one of the possible combining methods, can significantly increase the signal-to-noise ratio. The concept of the space diversity scheme in WBANs has been presented. The novelty of the article is the investigation of the influence of different mutual positions of the receiving antennas on the correlation of slow and fast fading of received signal. Received signal parameters obtained by different antennas is presented . The last part of the paper consists of the summary and concluding remarks
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