CN109302366A - A kind of WCDMA signal demodulating method suitable for signal analyzer platform - Google Patents
A kind of WCDMA signal demodulating method suitable for signal analyzer platform Download PDFInfo
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- CN109302366A CN109302366A CN201711436597.4A CN201711436597A CN109302366A CN 109302366 A CN109302366 A CN 109302366A CN 201711436597 A CN201711436597 A CN 201711436597A CN 109302366 A CN109302366 A CN 109302366A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0018—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The invention discloses a kind of WCDMA signal demodulating methods suitable for signal analyzer platform, comprising: the WCDMA signal received is carried out matched filtering by step 1；Step 2, signal are synchronous；Step 3 carries out descrambling and de-spreading to Primary Common Pilot Channel, and carries out offset estimation, to calculating phase compensating factor and amplitude compensating factor after the compensation of frequency pilot sign frequency deviation；Step 4 carries out frequency deviation compensation to the signal received；Step 5 is carried out descrambling and de-spreading to each physical channel, and is compensated using compensation factor to the symbol after descrambling and de-spreading；Step 6, transmitting modulation quality measurement.The method of the present invention without channel estimation and channel equalization and etc. and Primary Common Pilot Channel need to only be handled, obtain compensation factor, eliminate influence of the transmission channel to signal, and then rapidly signal transmitting modulation quality can be measured.
Description
Technical field
The present invention relates to a kind of signal demodulating method, specifically a kind of WCDMA signal suitable for signal analyzer platform
Demodulation method.
Background technique
It requires in fields such as wireless communication, satellite communication and radars to digital baseband, intermediate frequency, radio frequency vector signal and tune
Signal processed is analyzed, therefore signal analyzer generates therewith.
WCDMA is used as can be with the 3-G (Generation Three mobile communication system) such as backward compatible GSM, GPRS and EDGE, technology maturation, quotient
With widest in area.Traditional WCDMA demodulation process mainly includes the following steps: step 1, the signal progress to receiving
With filtering to reduce influence of the noise to signal；Step 2 synchronizes filtered signal；Step 3 utilizes corresponding scrambling code
Signal is descrambled, and then Primary Common Pilot Channel is de-spread, obtains frequency pilot sign, carries out frequency using frequency pilot sign
Estimation partially；Step 4 carries out frequency deviation compensation using offset estimation value；Step 5 carries out signal estimation, obtains the estimation of transmission channel
Value；Step 6, using channel estimation value, channel equalization is carried out to the signal received, to eliminate transmission channel to the shadow of signal
It rings；Step 7 carries out descrambling and de-spreading to each physical channel；Step 8, transmitting modulation quality measurement.
As the requirement to signal analyzer processing speed is higher and higher, the requirement to WCDMA signal demodulation speed is also got over
Carry out higher therefore new we have proposed one kind WCDMA signal demodulating method.
Summary of the invention
The purpose of the present invention is to provide a kind of WCDMA signal demodulating methods suitable for signal analyzer platform, with solution
Certainly the problems mentioned above in the background art.
To achieve the above object, the invention provides the following technical scheme:
A kind of WCDMA signal demodulating method suitable for signal analyzer platform, includes the following steps: step 1, to reception
The signal arrived carries out matched filtering；Step 2 synchronizes the signal after result matched filtering；Step 3, signal are completed to disturb
After code synchronizes, Primary Common Pilot Channel is de-spread, carries out offset estimation using primary common pilot symbol, and calculate phase
Compensation factor and amplitude compensating factor: firstly, utilizing the available offset estimation value of time delay conjugate multiplication method；Secondly, to leading
Frequency symbol carries out frequency deviation compensation；And then, it calculates the angle between each I circuit-switched data and Q circuit-switched data and is compared with π/4,
Available phase compensating factor；Finally, calculate frequency pilot sign amplitude and compared with 1, available Amplitude Compensation because
Son；Step 4, using offset estimation value, frequency deviation compensation is carried out to the signal after synchronizing；Step 5, to the compensated signal of frequency deviation into
Row descrambling and de-spreading compensates the symbol after descrambling and de-spreading using phase compensating factor and amplitude compensating factor；Step 6, letter
The measurement of number launch mass.
As a further solution of the present invention: the synchronization in the step 2 includes that slot synchronization, frame synchronization and scrambling code are same
Step.
As further scheme of the invention: the slot synchronization utilizes sliding correlation method by local Primary Synchronisation Code
Time slot head is found, and it is cumulative to carry out time slot；Frame synchronization is by local secondary synchronization code, using time slot head as initial position, believes receiving
It is related number to carry out sliding to 16 local secondary synchronization codes, so that it is determined that block number, and determination frame head position；Determining code character
After number, Primary Common Pilot Channel descrambling is carried out using 8 in code character main scrambling codes, the data after 8 groups of descramblings are de-spread, are utilized
The mode of contest score selects scrambling code number.
Compared with prior art, the beneficial effects of the present invention are: the method for the present invention is equal without channel estimation and channel
Weighing apparatus and etc. and Primary Common Pilot Channel need to only be handled, obtain compensation factor, eliminate influence of the transmission channel to signal,
And then rapidly signal transmitting modulation quality can be measured.
Detailed description of the invention
Fig. 1 is the flow chart of the method for the present invention.
Fig. 2 is the flow chart of the prior art in background technique.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Please refer to Fig. 1~2, in the embodiment of the present invention, a kind of WCDMA signal demodulation side suitable for signal analyzer platform
Method includes the following steps: step 1, carries out matched filtering to the signal received, and then reduces the influence of noise.
Step 2 synchronizes the signal after result matched filtering, including slot synchronization, frame synchronization and scrambling code
It is synchronous:
Slot synchronization is needed by local Primary Synchronisation Code, by WCDMA frame structure it is found that in the preceding 2560+256 for receiving signal
It must include Primary Synchronisation Code in a chip, time slot head can be found using sliding correlation method.It, can be to phase in order to ensure accuracy
It is cumulative to close result progress time slot；Frame synchronization need by local secondary synchronization code, using time slot head as initial position, will receive signal with
16 local secondary synchronization codes carry out sliding correlation, so that it is determined that block number, and it is known that frame head position；Determining code character
After number, Primary Common Pilot Channel descrambling is carried out using 8 in code character main scrambling codes, the data after 8 groups of descramblings are de-spread, are utilized
The mode of contest score selects scrambling code number.
Step 3, signal de-spread Primary Common Pilot Channel after completing scrambling code synchronization.It is accorded with using primary common pilot
Number offset estimation is carried out, and calculates phase compensating factor and amplitude compensating factor:
Firstly, utilizing the available offset estimation value of time delay conjugate multiplication method；Secondly, carrying out frequency deviation benefit to frequency pilot sign
It repays；And then, it calculates the angle between each I circuit-switched data and Q circuit-switched data and is compared with π/4, available phase compensation
The factor；Finally, calculating the amplitude of frequency pilot sign and being compared with 1, available amplitude compensating factor.
Step 4, using offset estimation value, frequency deviation compensation is carried out to the signal after synchronizing.
Step 5 carries out descrambling and de-spreading to the compensated signal of frequency deviation, utilizes phase compensating factor and amplitude compensating factor pair
Symbol after descrambling and de-spreading compensates.
Step 6, the measurement of signal launch mass.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (3)
1. a kind of WCDMA signal demodulating method suitable for signal analyzer platform, which comprises the steps of:
Step 1 carries out matched filtering to the signal received；Step 2 synchronizes the signal after matched filtering；Step 3,
Signal de-spreads Primary Common Pilot Channel after completing scrambling code synchronization, carries out offset estimation using primary common pilot symbol,
And calculate phase compensating factor and amplitude compensating factor: firstly, using the available offset estimation of time delay conjugate multiplication method
Value；Secondly, carrying out frequency deviation compensation to frequency pilot sign；And then, calculate the angle between each I circuit-switched data and Q circuit-switched data and with
π/4 compare, available phase compensating factor；Finally, calculating the amplitude of frequency pilot sign and being compared with 1, can obtain
To amplitude compensating factor；Step 4, using offset estimation value, frequency deviation compensation is carried out to the signal after synchronizing；Step 5 mends frequency deviation
Signal after repaying carries out descrambling and de-spreading, is mended using phase compensating factor and amplitude compensating factor to the symbol after descrambling and de-spreading
It repays；Step 6, the measurement of signal launch mass.
2. the WCDMA signal demodulating method according to claim 1 suitable for signal analyzer platform, which is characterized in that
Synchronization in the step 2 includes slot synchronization, frame synchronization and scrambling code synchronization.
3. the WCDMA signal demodulating method according to claim 2 suitable for signal analyzer platform, which is characterized in that
The slot synchronization finds time slot head by local Primary Synchronisation Code, using sliding correlation method, and it is cumulative to carry out time slot；Frame synchronization is borrowed
Local secondary synchronization code is helped, using time slot head as initial position, receiving signal, with 16 local secondary synchronization codes to carry out sliding related, from
And determine block number, and determine frame head position；After determining block number, descrambled using 8 main scrambling codes in code character, it is right
Data after 8 groups of descramblings carry out Primary Common Pilot Channel despreading, select scrambling code number in the way of contest score.
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| CN201711436597.4A CN109302366B (en) | 2017-12-26 | 2017-12-26 | WCDMA signal demodulation method suitable for signal analyzer platform |
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Citations (7)
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|---|---|---|---|---|
| CN1362800A (en) * | 2001-01-02 | 2002-08-07 | 华为技术有限公司 | Signal/interference ratio (SIR) measuring method |
| CN1773978A (en) * | 2004-11-09 | 2006-05-17 | 华为技术有限公司 | Method for realizing orthogonal frequency division multiplexing precision time synchronization |
| CN1972137A (en) * | 2006-10-25 | 2007-05-30 | 北京北方烽火科技有限公司 | A receiving signal frequency offset estimation and compensation method for WCDMA |
| CN101902425A (en) * | 2009-05-27 | 2010-12-01 | 北京威讯紫晶科技有限公司 | Method for synchronizing time and carrier frequency in short-range wireless network |
| CN102546484A (en) * | 2010-12-17 | 2012-07-04 | 上海明波通信技术有限公司 | Signal channel training method and signal channel training receiver device based on beacon frame |
| CN104717172A (en) * | 2015-03-06 | 2015-06-17 | 东南大学 | IQ imbalance compensation method and device in transmitter |
| CN106856463A (en) * | 2017-01-20 | 2017-06-16 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | MSK/GMSK coherent demodulation processing systems |
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2017
- 2017-12-26 CN CN201711436597.4A patent/CN109302366B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1362800A (en) * | 2001-01-02 | 2002-08-07 | 华为技术有限公司 | Signal/interference ratio (SIR) measuring method |
| CN1773978A (en) * | 2004-11-09 | 2006-05-17 | 华为技术有限公司 | Method for realizing orthogonal frequency division multiplexing precision time synchronization |
| CN1972137A (en) * | 2006-10-25 | 2007-05-30 | 北京北方烽火科技有限公司 | A receiving signal frequency offset estimation and compensation method for WCDMA |
| CN101902425A (en) * | 2009-05-27 | 2010-12-01 | 北京威讯紫晶科技有限公司 | Method for synchronizing time and carrier frequency in short-range wireless network |
| CN102546484A (en) * | 2010-12-17 | 2012-07-04 | 上海明波通信技术有限公司 | Signal channel training method and signal channel training receiver device based on beacon frame |
| CN104717172A (en) * | 2015-03-06 | 2015-06-17 | 东南大学 | IQ imbalance compensation method and device in transmitter |
| CN106856463A (en) * | 2017-01-20 | 2017-06-16 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | MSK/GMSK coherent demodulation processing systems |
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