CN109286588A - A kind of binary phase shift keying signal initial phase estimation method - Google Patents

A kind of binary phase shift keying signal initial phase estimation method Download PDF

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Publication number
CN109286588A
CN109286588A CN201710598645.3A CN201710598645A CN109286588A CN 109286588 A CN109286588 A CN 109286588A CN 201710598645 A CN201710598645 A CN 201710598645A CN 109286588 A CN109286588 A CN 109286588A
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shift keying
initial phase
phase shift
module
keying signal
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CN109286588B (en
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段云鹏
王平
朱智明
何靖
王百涛
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Beijing Institute of Remote Sensing Equipment
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Beijing Institute of Remote Sensing Equipment
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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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

The invention discloses a kind of binary phase shift keying signal initial phase estimation methods, the method of the present invention constructs binary phase shift keying signal initial phase estimation platform first, constructed system includes: signal sampling module, FFT module, carrier frequency estimation module and initial phase estimation module, binary phase shift keying signal is sampled by signal sampling module, form sample sequence, FFT module carries out FFT processing to sample sequence, carrier frequency estimation module is according to FFT processing result, estimate carrier frequency, initial phase estimation module estimates the initial phase of binary phase shift keying signal.The method of the present invention can estimate the initial phase of binary phase shift keying signal, and estimated initial phase precision is high, can satisfy requirement.

Description

A kind of binary phase shift keying signal initial phase estimation method
Technical field
The present invention relates to a kind of signal initial phase estimation method, especially a kind of binary phase shift keying signal initial phase Position estimation method.
Background technique
After band spread receiver work, need to carry out initial phase parameter to the binary phase shift keying signal received to estimate Meter, to carry out subsequent signal processing work.Binary phase shift keying signal belongs to phase-modulation, and the phase of modulated signal is straight It connects and is controlled by digital baseband signal, amplitude and frequency remain unchanged.Common signal initial phase estimation method are as follows: to two into Phase shift keyed signal processed is sampled, and sample sequence is formed；Carrier frequency estimation and initial position estimation are carried out to sample sequence；It uses Orthogonal digital vibration carries out digital quadrature mixing processing to sample sequence, is formed with phase and orthogonal data；It is first according to what is estimated Beginning position carries out initial phase estimation using same phase and orthogonal data.Since the method is to the first of binary phase shift keying signal Beginning position estimation accuracy be not it is very high, cause initial phase estimation performance decline.
Time domain data can be converted to frequency domain data by Fast Fourier Transform abbreviation FFT.
Summary of the invention
It is an object of that present invention to provide a kind of binary phase shift keying signal initial phase estimation methods, solve common letter The poor problem of number initial phase estimation method estimation performance.
A kind of binary phase shift keying signal initial phase estimation method, the specific steps are that:
The first step builds initial phase estimation platform
Initial phase estimates platform, comprising: signal sampling module, FFT module, carrier frequency estimation module and initial phase estimation Module.It is described:
The function of signal sampling module are as follows: binary phase shift keying signal is sampled, sample sequence is formed；
The function of FFT module are as follows: FFT processing is carried out to sample sequence；
The function of carrier frequency estimation module are as follows: according to FFT processing result, estimate carrier frequency；
The function of initial phase estimation module are as follows: estimate the initial phase of binary phase shift keying signal.
Second step signal sampling module samples binary phase shift keying signal, forms sample sequence
Signal sampling module samples binary phase shift keying signal x (t), is formed sample sequence x (n), and sample frequency is fs, sampling time interval Ts, Ts=1/fs；T is time parameter, and n is time domain points index value, and n=0,1 ..., N-1, N is to adopt The length of sample sequence x (n).
Third step FFT module carries out FFT processing to sample sequence
FFT module carries out FFT processing to sample sequence x (n), and sample sequence x (n) is transformed from the time domain to frequency domain, is obtained FFT processing result X (k):
Wherein k is frequency domain points index value, k=0,1 ..., N-1；J is imaginary unit, is indicatede‐j2πkn/NFor plural number Representation indicates cos (- 2 π kn/N)+jsin (- 2 π kn/N).
4th step carrier frequency estimation module estimates carrier frequency according to FFT processing result
Carrier frequency estimation module filters out the maximum value in FFT processing result X (k), so that it is determined that frequency corresponding to maximum value Count index value k in domain0, according to formula: f0=k0/(NTs), determine k0The corresponding frequency f of point0。
5th step initial phase estimation module estimates the initial phase of binary phase shift keying signal
Initial phase estimation module estimates the initial phase of binary phase shift keying signal
So far, the estimation of binary phase shift keying signal initial phase is realized.
More preferably, wherein in second step sample sequence length N=1024.
More preferably, in the 5th step binary phase shift keying signal initial phaseIt is obtained by following formula:
Wherein angle { } indicates to take the angle of plural number,For complex representation form, indicate: cos (- 4 π f0nTs) +jsin(‐4πf0nTs)。
The method of the present invention solves the problems, such as that common signal initial phase estimation method estimation performance is poor.It can estimate The initial phase of binary phase shift keying signal out, estimated initial phase precision is high, can satisfy requirement.
Specific embodiment
A kind of binary phase shift keying signal initial phase estimation method, the specific steps are that:
The first step builds initial phase estimation platform
Initial phase estimates platform, comprising: signal sampling module, FFT module, carrier frequency estimation module and initial phase estimation Module.It is described:
The function of signal sampling module are as follows: binary phase shift keying signal is sampled, sample sequence is formed；
The function of FFT module are as follows: FFT processing is carried out to sample sequence；
The function of carrier frequency estimation module are as follows: according to FFT processing result, estimate carrier frequency；
The function of initial phase estimation module are as follows: estimate the initial phase of binary phase shift keying signal.
Second step signal sampling module samples binary phase shift keying signal, forms sample sequence
Signal sampling module samples binary phase shift keying signal x (t), is formed sample sequence x (n), and sample frequency is fs, sampling time interval Ts, Ts=1/fs；T is time parameter, and n is time domain points index value, and n=0,1 ..., N-1, N is to adopt The length of sample sequence x (n), N=1024.
Third step FFT module carries out FFT processing to sample sequence
FFT module carries out FFT processing to sample sequence x (n), and sample sequence x (n) is transformed from the time domain to frequency domain, is obtained FFT processing result X (k):
Wherein k is frequency domain points index value, k=0,1 ..., N-1；J is imaginary unit, is indicatede‐j2πkn/NFor plural number Representation indicates cos (- 2 π kn/N)+jsin (- 2 π kn/N).
4th step carrier frequency estimation module estimates carrier frequency according to FFT processing result
Carrier frequency estimation module filters out the maximum value in FFT processing result X (k), so that it is determined that frequency corresponding to maximum value Count index value k in domain0, according to formula: f0=k0/(NTs), determine k0The corresponding frequency f of point0。
5th step initial phase estimation module estimates the initial phase of binary phase shift keying signal
Initial phase estimation module uses formula:
Estimate the initial phase of binary phase shift keying signalWherein angle { } indicates to take the angle of plural number,For complex representation form, indicate: cos (- 4 π f0nTs)+jsin(‐4πf0nTs)。
So far, the estimation of binary phase shift keying signal initial phase is realized.

Claims (3)

1. a kind of binary phase shift keying signal initial phase estimation method, it is characterised in that specific steps are as follows:
The first step builds binary phase shift keying signal initial phase estimation platform
Binary phase shift keying signal initial phase estimates platform, comprising: signal sampling module, FFT module, carrier frequency estimation module With initial phase estimation module；It is described:
The function of signal sampling module are as follows: binary phase shift keying signal is sampled, sample sequence is formed；
The function of FFT module are as follows: FFT processing is carried out to sample sequence；
The function of carrier frequency estimation module are as follows: according to FFT processing result, estimate carrier frequency；
The function of initial phase estimation module are as follows: estimate the initial phase of binary phase shift keying signal；
Second step signal sampling module samples binary phase shift keying signal, forms sample sequence
Signal sampling module samples binary phase shift keying signal x (t), is formed sample sequence x (n), sample frequency fs, adopt Sample time interval is Ts, Ts=1/fs；T is time parameter, and n is time domain points index value, and n=0,1 ..., N-1, N is sampling sequence Arrange the length of x (n)；
Third step FFT module carries out FFT processing to sample sequence
FFT module carries out FFT processing to sample sequence x (n), and sample sequence x (n) is transformed from the time domain to frequency domain, is obtained at FFT It manages result X (k):
Wherein k is frequency domain points index value, k=0,1 ..., N-1；J is imaginary unit, is indicatede‐j2πkn/NFor complex representation Form indicates cos (- 2 π kn/N)+jsin (- 2 π kn/N)；
4th step carrier frequency estimation module estimates carrier frequency according to FFT processing result
Carrier frequency estimation module filters out the maximum value in FFT processing result X (k), so that it is determined that the point of frequency domain corresponding to maximum value Number index value k0, according to formula: f0=k0/(NTs), determine k0The corresponding frequency f of point0。
5th step initial phase estimation module estimates the initial phase of binary phase shift keying signal
Initial phase estimation module estimates the initial phase of binary phase shift keying signal
So far, the estimation of binary phase shift keying signal initial phase is realized.
2. phase estimation method as described in claim 1, it is characterised in that: the length N=of sample sequence in the second step 1024。
3. phase estimation method as described in claim 1, it is characterised in that: binary phase shift keying signal in the 5th step Initial phaseIt is obtained by following formula:
Wherein angle { } indicates to take the angle of plural number,For complex representation form, indicate: cos (- 4 π f0nTs)+jsin (‐4πf0nTs)。
CN201710598645.3A 2017-07-21 2017-07-21 Method for estimating initial phase of binary phase shift keying signal Active CN109286588B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
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CN1463084A (en) * 2003-06-18 2003-12-24 中国人民解放军理工大学通信工程学院 Method and device of iterative demodulation and decode for BPSK modulating system by Turbo encoding
CN1543088A (en) * 2003-11-07 2004-11-03 中国人民解放军理工大学通信工程学院 Iterative demodulating-decoding method and apparatus for code modulation system having output external information
CN1812295A (en) * 2005-11-28 2006-08-02 北京星河亮点通信软件有限责任公司 Method for testing 3G terminal radio frequency consistency
US20090028223A1 (en) * 2007-07-27 2009-01-29 Mediatek Inc. Signal receiver and method for estimating residual doppler frequencies of signals thereof
CN101751375A (en) * 2008-12-12 2010-06-23 普天信息技术研究院有限公司 Fast calculation method and device of discrete Fourier transformation (DFT)/inverse discrete Fourier transform (IDFT)
CN102571668A (en) * 2012-01-06 2012-07-11 合肥东芯通信股份有限公司 Phase compensation method and system in LTE (long term evolution) system
CN105099978A (en) * 2015-07-14 2015-11-25 华中科技大学 Method for removing phase modulation information

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1463084A (en) * 2003-06-18 2003-12-24 中国人民解放军理工大学通信工程学院 Method and device of iterative demodulation and decode for BPSK modulating system by Turbo encoding
CN1543088A (en) * 2003-11-07 2004-11-03 中国人民解放军理工大学通信工程学院 Iterative demodulating-decoding method and apparatus for code modulation system having output external information
CN1812295A (en) * 2005-11-28 2006-08-02 北京星河亮点通信软件有限责任公司 Method for testing 3G terminal radio frequency consistency
US20090028223A1 (en) * 2007-07-27 2009-01-29 Mediatek Inc. Signal receiver and method for estimating residual doppler frequencies of signals thereof
CN101751375A (en) * 2008-12-12 2010-06-23 普天信息技术研究院有限公司 Fast calculation method and device of discrete Fourier transformation (DFT)/inverse discrete Fourier transform (IDFT)
CN102571668A (en) * 2012-01-06 2012-07-11 合肥东芯通信股份有限公司 Phase compensation method and system in LTE (long term evolution) system
CN105099978A (en) * 2015-07-14 2015-11-25 华中科技大学 Method for removing phase modulation information

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