OFDM Performance of Ultra Wideband in Wireless Body Area Network Channel

Abstract

Data transfer for health monitoring can be highly critical because of life dependency transmitted data. IEEE 802.15.6 is a standard for wireless body area network published in 2012 to satisfy the reliability which is required by health monitoring systems. Ultra wideband is one of proposed physical layer technologies specified in the wireless body area network standard which offers high bandwidth, low power, and low interference with other devices. Orthogonal frequency-division multiplexing is commonly used to transmit the data in many wireless communication standards due to its high spectral efficiency and immunity to the inter symbol interference. In this study, bit-error rate performance for orthogonal frequency-division multiplexing with different interpolation based least square channel estimation is given for wireless body area network channel model. OFDM symbol length and pilot length used in OFDM symbol is investigated in bit error rate -signal to noise ratio graphs.

QPSK-dual carrier modulation for ultra-wideband communication in body area network channels

“…An average multipath number is chosen as one hundred for CM4 [11]. The same channel models were studied in [12,13] to analyze equalizer and OFDM performances in BAN channels.…”

“…In the OFDM receiver, the received signal contains the destructive transmitted signal, channel effect, and AWGN. A zero forcing equalizer [12,14] as in Eqs. (10) and ( 11) is applied in the OFDM receiver to avoid the channel effect.…”

“…Here, the AWGN is neglected. The output of the filter is interpolated by linear interpolation method to estimate the channel at data subcarriers [12].…”

“…Therefore, the sums of the absolute difference of the received symbol and modulation symbols are calculated as in Eq. (12), and the smallest one is chosen as the received modulation symbol:…”