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IEEE 802.15.4 takes a center stage in IoT as Low- Rate Wireless Personal AreaNetworks(LR-WPANs). The standard specifies Offset Quadrature Phase Shift KeyingPhysical Layer (O-QPSK PHY) with half-sine pulse shaping which can be eitheranalyzed under the class of M-ary PSK signals (QPSK signal with offset) or asMinimum Shift Keying (MSK) signal. M-ary PSK demodulation is requires perfectcarrier and has minimal error. MSK signals which falls under Continuous PhaseFrequency Shift Keying can be demodulated non-coherently but error performanceis not as good. In our paper, this dual nature of IEEE 802.15.4 PHY isexploited to propose a dual mode receiver comprising of QPSK demodulator chainand MSK demodulator chain as a single system on chip. The mode can beconfigured manually depending on the type of application or based on thefeedback from a Signal to Noise (SNR) indicator employed in the proposedreceiver. M-ary PSK chain is selected for lower SNRs and MSK for higher SNRs.Each of these properties are analyzed in detail for both demodulator chains andwe go on to prove that MSK detection can be used for low power, low complex andlow latency while QPSK detection is employed for minimal error.

Reconfigurable Dual Mode IEEE 802.15.4 Digital Baseband Receiver for Diverse IoT Applications