Method for estimating signal quality of MSK and O-QPSK signals

Abstract

The invention relates to a method for estimating the signal quality of MSK and O-QPSK signals. Firstly, the signal quality of MSK and O-QPSK signals is estimated based on the statistical characteristics of a chip. Secondly, the chip synchronization is established, and the establishment of the chip synchronization is before the synchronization of spread spectrum code phases and the synchronization of frames. Thirdly, with the assistant of a chip symbol synchronization signal, the simple nonlinear operation of a baseband signal and the simplified linear average of an operation result are carried out, and the high resolution estimation of the current signal quality can be rapidly obtained. The signal quality can be accurately estimated in a short time, an estimation value is subjected to delicate quantitative classification, and the accurate use of the estimation value by an upper application is facilitated.

Description

Technical field [0001] The invention relates to an efficient estimation method for the signal quality of MSK and O-QPSK signals, and belongs to the technical field of wireless local area network transmission. Background technique [0002] MSK and O-QPSK modulation methods are a popular modulation scheme for wireless communication. They have good power utilization and are convenient for modulation and demodulation and are increasingly used in wireless network communication transmission schemes. Zigbee is a wireless transmission technology that has adopted this modulation technology in recent years. [0003] ZigBee is a two-way wireless communication technology with close range, low complexity, low power consumption, low data rate and low cost. The basis of ZigBee is IEEE 802.15.4, which is a standard of the IEEE wireless personal area network (Personal Area Network, PAN) working group, and is called the IEEE 802.15.4 (ZigBee) technical standard. The ZigBee Alliance adopted IEEE 80...

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Problems solved by technology

[0004] The low complexity, low power consumption, and low cost of ZigBee devices are undoubtedly one of its advantages that can be widely used, but its low data rate two-way communication has become his preferred choice in foreseeable future applications. A key factor restricting its development, the IEEE organization is also aware of this, and has successively added modulation methods to increase data rates in subsequent supplementary versions of the specification (such as 2450MHz chirp spread spectrum PHY in IEEE 802.15.4a-2007 ) as an optional supplement, but the newly added modulation method is quite different from the widely used modulation technology before, so it cannot be effectively compatible with the previous standard, which brings a sharp increase in complexity and cost and functional The response of power consumption is increased, thus sacrificing its original advantages

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