Subrahmanyam, V and Zubair, Mohammed Abdullah and Kumar, Ajay and Rajalakshmi, P
(2015)
Minimal Error IEEE 802.15.4 Communication Module for Heart Monitoring Data Transmission in IoT.
In: 18th International Symposium on Wireless Personal Multimedia Communications WPMC, 13 to 16 December 2015, Hyderabad, India.
Abstract
With an estimation of 20 billion devices being connected to the Internet in the coming years, the accuracy and the robustness of the wireless communication modules takes the center stage. The health-care scenario, due to its critical nature, calls for an error free communication. IEEE 802.15.4 is the established standard in the Internet of Things scenario that uses Direct Sequence Spread Spectrum - Offset Quadrature Phase Shift Keying (DSSS-OQPSK) modulation. In this paper, we propose a modified minimal error IEEE 802.15.4 communication system for the IoT applications in health care. The proposed architecture uses Maximum Likelihood based frequency offset estimator that can compensate upto 80ppm of the frequency offset. The detection of the symbols is achieved by the complex correlation of the spread sequence. The Bit Error Rate (BER) performance of the proposed architecture is significantly improved compared to the standard architecture. For example, at BER of 0.01, it achieves a gain of 2db over the standard. The proposed ML estimator for frequency offset performs better in terms of error variance than the existing estimators for IEEE 802.15.4.
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