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Simultaneous Transmission of Biomedical Signals Using DS-CDMA

Telemedicine system requires high speed and secured data transmission. Recent studies in transmission of biomedical signals are mostly based on Bluetooth devices that use Frequency-hopping spread spectrum (FHSS) where the transmission range (10-100 m) and speed (1-3 Mbps) are limited. However, IEEE 802.11 Wireless LAN or wireless fidelity (Wi-Fi) uses direct sequence spread spectrum (DSSS) in physical layer that offers high speed simultaneous transmission of several leads of biomedical signals. In this paper, we have simulated DS-CDMA for transmission of several biosignals in Additive white Gaussian noise (AWGN) environment. As all the signals are spread over the entire bandwidth in DS-CDMA, it facilitates security of information to the end user. Furthermore, Walsh code which is a linear and mutually orthogonal code, is assigned to several leads of biosignals that minimizes the signal interference. To estimate the performance of the system, error calculating parameters like RMSE, STD and PRD are measured. For 12 lead ECG data average PRD is obtained 0.6% when SNR is 8 dB (out of scale 10). Likewise, for EEG and stress data the errors are also very low. The simulated results depict better performance of the system even in presence of dominant noise.