一种基于恒包络的IEEE802.15.4节能收发机

Efficient transmission has always been a major issue for wireless sensor networks (WSN) due to the fact that the nodes are usually battery-powered. Wireless communication accounts for a strikingly large proportion of the total power consumption of a node. In this paper, we reduce the power consumption in the physical layer by designing a low-power transceiver. IEEE 802.15.4 is a popular communication protocol with many good features that can be used for power-saving. We design a simple energy efficient transceiver for IEEE 802.15.4. It utilizes the constant-envelope feature of the offset quadrature phase shift keying (O-QPSK) signal with half-sine shaping defined in the protocol to simplify the structure of the transceiver. Compared with conventional transceivers, the proposed transceiver uses a hard-limiter (inverter) to replace the digital-to-analog converter (DAC) and the analog-to-digital converter (ADC), which results in a much simpler structure and lower power consumption. Furthermore, the correlation operation could be efficiently implemented just by a reversible counter. The performance of the proposed transceiver is effectively demonstrated by both computer simulations and hardware tests.