CN103888198B - The method of estimation of the signal quality of MSK and O-QPSK signal - Google Patents
The method of estimation of the signal quality of MSK and O-QPSK signal Download PDFInfo
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- CN103888198B CN103888198B CN201410010092.1A CN201410010092A CN103888198B CN 103888198 B CN103888198 B CN 103888198B CN 201410010092 A CN201410010092 A CN 201410010092A CN 103888198 B CN103888198 B CN 103888198B
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Abstract
The present invention relates to the method for estimation of the signal quality of MSK and O-QPSK signal, based on the statistical nature of chip to the estimation of the signal quality of MSK and O-QPSK signal; The foundation of chip synchronization, the foundation of chip synchronization is synchronous prior to the synchronous of spreading code phase place and frame; Chip symbol synchronizing signal auxiliary under simple nonlinear operation is carried out to baseband signal and and can obtain fast estimating the high-resolution of current signal quality to the linear averaging that operation result simplifies.Accurately can estimate signal quality in the short period of time, finer and smoother quantization modulation is carried out to estimated value, contribute to upper layer application and use this estimated value more accurately.
Description
Technical field
The present invention relates to a kind of efficient method of estimation of signal quality of MSK and O-QPSK signal, belong to WLAN (wireless local area network) transmission technique field.
Background technology
MSK and O-QPSK modulation system is a kind of popular modulation scheme for radio communication, there is good power utilization and be convenient to modulation and demodulation characteristic and by increasing for wireless communication transmission plan.Zigbee is exactly a kind of Radio Transmission Technology adopting this modulation technique in recent years.
ZigBee be a kind of closely, low complex degree, low-power consumption, low data rate, low cost two-way wireless communication technology.The basis of ZigBee is IEEE802.15.4, and this is a standard of IEEE wireless personal local area network (PersonalAreaNetwork, PAN) working group, is referred to as IEEE802.15.4 (ZigBee) technical standard.ZigBee alliance, when formulating ZigBee standard, have employed IEEE802.15.4 as its physical layer and Medium Access Layer specification.On its basis, ZigBee Leagues enact data link layer (DLL), network layer (NWK) and API (APl) specification, and the work being responsible for the aspects such as higher layer applications, test and marketing.ZigBee technology will mainly be embedded in the equipment such as consumer electronics device, family and building automation equipment, industrial control device, computer peripheral equipment, medical energy converter, toy and game machine, support the application in the fields such as the control based on radio communication among a small circle and automation, also support geographic positioning functionality simultaneously.ZigBee has very wide application prospect.
The low complex degree of the device of ZigBee, low-power consumption, low cost feature is undoubtedly it can one of the advantage of extensive use, but the characteristic of its low data rate two-way communication becomes again key factor of his in the application in the predictable future obtained one its development of restriction, IEEE organizes and also appreciates this point, and the modulation system (2450MHzchirpspreadspectrumPHY as in IEEE802.15.4a-2007) adding raising data transfer rate in the specification of supplementary version thereafter is successively supplemented as selectable, but there is very big-difference in newly-increased modulation system and before widely used modulation technique, therefore the standard before effective compatibility cannot be accomplished, this just brings being increased sharply of complexity and cost and to increase with the response of power consumption thus to sacrifice its original advantage.How can improve the cost that its availability of frequency spectrum maintains existing complexity simultaneously and become a current communications field green science and technology focus received much concern of industry.
ZigBee physical layer send/receive, and in the physical layer specification of IEEE802.15.4-2006, halfsineO-QPSK and 16-aryOrthogonalDSSS is combined into the modulation system used on 868/915/2450MHz.According to the length of DSSS frequency expansion sequence used and the data rate difference supporting 100kb/s and 250kb/s respectively of spreading rate.For 2450MHz physical layer specification, IEEE802.15.4-2006 has done following regulation to its modulation system: 2450MHz physical layer modulation and spread spectrum can be divided into following several step: 1) bit is to sign map (Bit-to-symbolmapping), needs the data of transmission to be mapped as a symbol according to every 4 bits one group last layer; 2) symbol maps (Symbol-to-chipmapping) to chip, be 16 length is the chip sequence of 32bit by 16 possible sign map; 3) Q-QPSK modulation (O-QPSKmodulation), is mapped on the orthogonal coordinate of I-phase and Q-phase two by each chip sequence, the constellation point of the corresponding chip of every a pair I/Q value, and Tc is chip period; 4) Half-sine is shaping, and why halfsineO-QPSK and 16-aryOrthogonalDSSS can become a kind of leading modulation technique in ZigBee is because the feature of itself is applicable to the applied environment of ZigBee.The signal can finding out HalfsineO-QPSK on a complex plane its track strictly drops on unit circle, and this illustrates that its time domain signal envelope is constant.This characteristic is that this power utilization for radio-frequency (RF) power amplification helps, and also reduces the requirement of the linearity of radio frequency device simultaneously, is equivalent to and reduces implementation complexity because the I of O-QPSK signal and Q component can not pass zero point simultaneously.ZiBee is made to use being designed in order to possibility of simple low cost low-power consumption.The application of 16-aryOrthogonalDSSS brings the signal-to-noise performance gain of more than 9dB, for the multi-path propagation effects reduced in the impact of noise and various interference in channel and channel and improve receiving sensitivity and have positive effect.
Summary of the invention
The object of the invention is the deficiency overcoming prior art existence, a kind of method of MSK and O-QPSK signal being carried out to the estimation of quick high accuracy signal quality is provided.
Object of the present invention is achieved through the following technical solutions:
The method of estimation of the signal quality of MSK and O-QPSK signal, based on the statistical nature of chip to the estimation of the signal quality of MSK and O-QPSK signal; The foundation of chip synchronization, the foundation of chip synchronization is synchronous prior to the synchronous of spreading code phase place and frame; Chip symbol synchronizing signal auxiliary under simple nonlinear operation is carried out to baseband signal and and can obtain fast estimating the high-resolution of current signal quality to the linear averaging that operation result simplifies.
Further, the method of estimation of the signal quality of above-mentioned MSK and O-QPSK signal, enter radio-frequency module at the input MSK of receiver or O-QPSK radiofrequency signal to be transferred to zero intermediate frequency and to become baseband signal, baseband signal is converted to digital sampled signal r (n) by analogue-to-digital converters after low pass filter; Under the control of symbol timing recovery module, digital sampled signal r (n) is converted into signal rs (k) of character rate sampling, and k is sampling instant corresponding to the center of each symbol; The signal rs (k-1) in signal rs (k) and a upper moment was carried out conjugate multiplication, and asks again after real part computing is got to this product and thoroughly deserve s1 (k):
S1(k)=abs{real[rs(k)rs*(k-1)]}
Wherein, real () is for get real part computing to plural number; Abs () is the computing that takes absolute value;
Then, carry out segmentation to s1 (k) to be averaging, section length is decided to be the integral number power of 2, the result on average obtained is the estimated result of signal quality, estimated value numerical value is larger, shows that signal quality is poorer, otherwise represents that signal quality is better, when this estimated value numerical value is zero, represent that signal quality reaches peak.
The substantive distinguishing features that technical solution of the present invention is outstanding and significant progress are mainly reflected in:
The inventive method can accurately be estimated signal quality in the short period of time, carries out finer and smoother quantization modulation to estimated value, contributes to upper layer application and uses this estimated value more accurately.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, technical solution of the present invention is described further:
Fig. 1: schematic flow sheet of the present invention.
Embodiment
The method of estimation of the signal quality of MSK and O-QPSK signal, first, the estimation of statistical nature to the signal quality of MSK and O-QPSK signal based on chip is, instead of based on the statistical nature after spreading code solution spread spectrum, neither based on the error rate statistic feature of the physical frame of transmission; Then, estimation due to signal quality is the statistical nature based on chip, therefore phase locked auxiliary without the need to setting up spreading code when carrying out signal quality and estimating, also the foundation without the need to frame synchronization is assisted, only need the foundation of chip synchronization, and synchronous necessarily prior to the synchronous of spreading code phase place and frame of the foundation of chip synchronization; Finally, chip symbol synchronizing signal auxiliary under simple nonlinear operation is carried out to baseband signal and and can obtain fast estimating the high-resolution of current signal quality to the linear averaging that this operation result simplifies.
As shown in Figure 1, enter radio-frequency module at the input MSK of receiver or O-QPSK radiofrequency signal to be transferred to zero intermediate frequency and to become baseband signal, baseband signal is converted to digital sampled signal r (n) by analogue-to-digital converters after low pass filter; Under the control of symbol timing recovery module, digital sampled signal r (n) is converted into signal rs (k) of character rate sampling, and k is sampling instant corresponding to the center of each symbol; The signal rs (k-1) in signal rs (k) and a upper moment was carried out conjugate multiplication, and asks again after real part computing is got to this product and thoroughly deserve s1 (k):
S1(k)=abs{real[rs(k)rs*(k-1)]}
Wherein, real () is for get real part computing to plural number; Abs () is the computing that takes absolute value;
Then, carry out segmentation to s1 (k) to be averaging, section length is decided to be the integral number power of 2, the result on average obtained is the estimated result of signal quality, estimated value numerical value is larger, shows that signal quality is poorer, otherwise represents that signal quality is better, when this estimated value numerical value is zero, represent that signal quality reaches peak.
In sum, the inventive method can accurately be estimated signal quality in the short period of time, carries out finer and smoother quantization modulation to estimated value, contributes to upper layer application and uses this estimated value more accurately.
It is to be understood that: the above is only the preferred embodiment of the present invention; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (1)
- The method of estimation of the signal quality of 1.MSK and O-QPSK signal, is characterized in that: based on the statistical nature of chip to the estimation of the signal quality of MSK and O-QPSK signal; The foundation of chip synchronization, the foundation of chip synchronization is synchronous prior to the synchronous of spreading code phase place and frame; Chip symbol synchronizing signal auxiliary under to baseband signal carry out simple nonlinear operation and and can obtain fast estimating the high-resolution of current signal quality to the linear averaging that operation result simplifies;Enter radio-frequency module at the input MSK of receiver or O-QPSK radiofrequency signal to be transferred to zero intermediate frequency and to become baseband signal, baseband signal is converted to digital sampled signal r (n) by analogue-to-digital converters after low pass filter; Under the control of symbol timing recovery module, digital sampled signal r (n) is converted into signal rs (k) of character rate sampling, and k is sampling instant corresponding to the center of each symbol; The signal rs (k-1) in signal rs (k) and a upper moment was carried out conjugate multiplication, and asks again after real part computing is got to this product and thoroughly deserve s1 (k):s1(k)＝abs{real[rs(k)rs*(k-1)]}Wherein, real () is for get real part computing to plural number; Abs () is the computing that takes absolute value;Then, carry out segmentation to s1 (k) to be averaging, section length is decided to be the integral number power of 2, the result on average obtained is the estimated result of signal quality, estimated value numerical value is larger, shows that signal quality is poorer, otherwise represents that signal quality is better, when this estimated value numerical value is zero, represent that signal quality reaches peak.
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