A non-coherent bpsk receiving method suitable for ieee802.15.4

Abstract

The invention provides an incoherent BPSK receiver for IEEE802.15.4. A received data frame is composed of a preamble with four bytes, a start frame delimiter with a byte, a physical frame header with a byte and a physical layer service data unit with a plurality of bytes, wherein the preamble and the start frame delimiter are used for conducting bit synchronization and byte synchronization of data respectively, and the physical frame header is used for representing the length of the physical layer data service unit. Firstly, the receiver processes the preamble of the received data frame to acquire frequency deviation information; secondly, the physical layer service data unit is positioned according to the start frame delimiter and the physical frame header and then processed to be used for detection and judgment; and finally, the processed physical layer data service data unit is detected and judged by means of the frequency deviation information extracted from the preamble. The incoherent BPSK receiver for IEEE802.15.4 works in 868 / 915 / 950-MHz frequency bands and has the advantages of low computing complexity and high reliability.

Description

technical field [0001] The invention relates to the technical field of communication signal detection, in particular to a non-coherent BPSK receiving method suitable for IEEE802.15.4. Background technique [0002] IEEE 802.15.4 is the basis of ZigBee, WirelessHART and other specifications, and describes the physical layer and medium access control protocol of low-rate wireless personal area network. It initially works on the ISM frequency band of 868 / 915MHz and 2.4GHz, and the data transmission rate can reach up to 250kbps. The advantages of low power consumption and low cost make it widely used in many fields such as data acquisition, processing and analysis, remote control precision agriculture automation, environmental protection and monitoring. In the latest standard published in 2011, 314–316MHz, 430–434MHz, 779–787MHz and 950–956MHz working frequency bands were added. [0003] like figure 1 As shown, the 802.15.4 protocol uses different modulation methods and data t...

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Problems solved by technology

[0015] As mentioned above, the disadvantages of the existing complex baseband non-coherent receivers are: since the frequency offset information is extracted by formula (1), and the channel received data of PSDU is differentially processed by formula (2), so Y 0 and A 0 The frequency offsets contained in [m] are all Therefore, in formula (3), Y must first be 0 Take the conjugate operation (that is, Y 0 Useful information in becomes ) to A 0 [m] Perform frequency frequency compensation

If the amount of data is huge, a large number of conjugate operations caused by multiple retransmissions will also consume considerable energy, which will reduce the service life of the 802.15.4 network with insufficient energy supply

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