Partitioning method for observation space in BPSK demodulating space and application

Abstract

The invention relates to a partitioning method for an observation space in the BPSK demodulating process. The observation space is a complex plane displayed by a BPSK signal constellation picture. The partitioning method comprises the following steps of: S1, uniformly partitioning the integral observation space into (with reference to the specification) sector observation domains according to an anticlockwise direction, wherein (with reference to the specification) is a random finite positive even number and is used for representing the number of the observation domains; S2, enabling an angular bisector of a first observation domain to be coincided with positive half axis of a real axis; and S3, determining an angle value of the angular bisector of each observation domain as an observation quantity of the observation domain. Application of the partitioning method for the observation space in the BPSK demodulating process is applicable to an incoherent BPSK receiver in an IEEE802.15.4 protocol. The invention provides the partitioning method for the observation space in the BPSK demodulating process and the application thereof to the IEEE802.15.4 protocol. By carrying out reasonable partitioning on the observation space, reliability of the information transmission process is improved; the more the partitioned observation domains are, the higher the reliability is; and by reasonably selecting the number of the observation domains, low-energy-consumption signal transmission can also be implemented.

Description

technical field [0001] The invention relates to the technical field of communication signal waveform detection and statistical estimation, in particular to the division method and application of the observation space in the BPSK demodulation process. Background technique [0002] As one of the hotspots of the Internet of Things access network technology, the low-power short-range Internet of Things covers a variety of different network types, and Low-rate Wireless Personal Area Network (Low-rate Wireless Personal Area Network, LR-WPAN) is one of the most important types. At present, the specific implementation methods of LR-WPAN emerge in endlessly, showing a diversified development trend (there are seven types such as Zigbee, 6LowPAN, and Thread), and the application fields are also extremely wide, but they all adopt a unified architecture at the perception layer, namely IEEE 802.15. 4 agreement. The IEEE 802.15.4 protocol describes the physical layer and media access cont...

AI Technical Summary

Problems solved by technology

As mentioned above, the shortcomings of traditional typical non-coherent receivers are: from the formula (4), we need to obtain the frequency offset Nω through division operation and complex arctangent operation in step 3 0 T c estimated value of For 802.15.4 network terminal nodes with strictly limited energy supply, the calculation complexity is relatively large, the energy consumption is large, and the implementation cost is also high

It is well known that on the constellation diagram of the BPSK signal, the two constellation points are distributed on the positive half axis and the negative half axis of the horizontal axis, because the range of 0-2π needs to be divided into two parts, and the frequency offset of all signals The values ​​at two constellation points are estimated, so if the frequency offset is estimated with the angle value corresponding to the constellation point, it will cause a serious deviation

At the same time, the disadvantage of the traditional typical low-complexity non-coherent receiver is that this scheme also needs to extract the frequency offset Nω from Y in advance 0 T c estimated value of Then compensate A[m]

If the amount of data is huge, the communication process of multiple retransmissions will also consume huge energy, which will reduce the service life of the 802.15.4 network with insufficient energy supply

Images