CN108933751A - Ofdm signal gain control method, device and recording medium based on detection - Google Patents

Ofdm signal gain control method, device and recording medium based on detection Download PDF

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Publication number
CN108933751A
CN108933751A CN201810632661.4A CN201810632661A CN108933751A CN 108933751 A CN108933751 A CN 108933751A CN 201810632661 A CN201810632661 A CN 201810632661A CN 108933751 A CN108933751 A CN 108933751A
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signal
gain control
ofdm
ofdm signal
detection
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CN108933751B (en
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付林罡
闫朝星
孙亚男
李辉
焦东立
彭浪
胡学明
李旭鹏
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Aerospace Long March Launch Vehicle Technology Co Ltd
Beijing Institute of Telemetry Technology
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Aerospace Long March Launch Vehicle Technology Co Ltd
Beijing Institute of Telemetry Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2692—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

Ofdm signal gain control method based on detection includes the following steps: Step 1: the error for calculating gain control based on preset initial gain control parameter and the estimation of ofdm signal second moment signal power tracks signal EA1, while detecting ofdm signal leading symbol data yP(n) and signal y (n) is received；Step 2: according to the ofdm signal leading symbol data y obtained in step 1P(n), the error for calculating time domain gain control tracks signal EA2；Step 3: the error for calculating frequency domain gain control tracks signal E according to the reception signal y (n) obtained in step 1A3。

Description

Ofdm signal gain control method, device and recording medium based on detection
Technical field
The present invention relates to ofdm signal gain control method, device and recording mediums based on detection, belong to digital radio Communication transmission technology field.
Background technique
In Spacecraft TT&C communication system, between airborne communication terminal, between airborne communication terminal and ground control station Relative positional relationship during navigation has dynamic variation characteristic, and general TTC & DT Systems are difficult to through power control tune Whole transmission power realizes that stabilization signal receives, and often passes through automatic growth control (Automatic Gain on the receiver side Control, AGC) realize reception signal Larger Dynamic range reception.Especially in the height of the mono- dual-mode of TDD based on burst transfer In fast data transmission Unmanned Aerial Vehicle Data catenary system, needs fast and accurately to complete gain of received signal control, guarantee analog to digital conversion The validity of ADC entry data.
Meanwhile in order to effectively antagonize the multi-path jamming under low elevation angle environment, high-speed data catenary system mainly uses orthogonal frequency Divide multiplexing OFDM system.Ofdm signal has biggish dynamic range in time domain, which completes fast and accurately receiver Gain control brings challenge.It is led for using the new opplications such as OFDM system mobile communication system or Unmanned Aerial Vehicle Data catenary system Domain, ADI company develop the transceiver architecture based on Software Radio platform, typical as AD9361, AD9371, AD9375 are flat Platform etc..It is integrated with gain control module in these transceivers, mainly has automatic growth control AGC, manual gain to control two kinds of MGC Mode.Wherein, automatic growth control mode interacts control without the Base-Band Processing BBP of FPGA, and manual gain controls MGC The pointer of main control directive gain look-up table, look-up table are divided into full table and table mode.Each receiver is logical under full table schema Cross the control gain of pointer, under table mode Base-Band Processing BBP control respectively LMT (low-noise amplifier LNA, frequency mixer and Trans-impedance amplifier) and low-pass filter LPF gain.The look-up table is general to carry out AGC stepping as unit of 1dB, increases manually Under benefit control MGC mode, Base-Band Processing BBP can there are two types of control gain method: writing control gain pointer, Huo Zheyong using SPI The mobile gain pointer of " control input " pin.Automatic growth control is themselves based on the gross energy processing reception for receiving signal and noise Signal amplitude, manual gain control MGC mode need the docking receipts signal amplitude in Base-Band Processing BBP effectively to be scaled, with Conventional automatic gain control circuit is similar, Publication No. CN107302409A " a kind of base such as disclosed on October 27th, 2017 In the AGC method of oversampled signals signal-to-noise ratio (SNR) estimation " in control method, require carry out gain control processing.
" one kind is used for ofdm system to the patent that the notification number of China's authorization on July 28th, 2017 is 104954033 B of CN Speed automatic gain control circuit and method " in disclose ofdm signal level be calculated and compared；On August 5th, 2015 The notification number of China's authorization is the patent of 102273164 B of CN " to the automatic increasing of the transmission based on OFDM in cordless communication network It is disclosed in benefit control (AGC) " and initial receiver gain is adjusted based on cyclic prefix；The public affairs of the China's authorization on the 18th of September in 2013 It accuses number patent " a kind of suitable for the auto gain control method of ofdm system and control circuit " for being 101964774 B of CN It discloses and calculates signal energy in window using slide window processing and be averaged；The notification number of the China's authorization on the 26th of August in 2015 is CN It is disclosed in the patent " AGC and DC calibration method and system for OFDM/OFDMA system " of 102057568 B based on circulation Prefix realizes AGC and DC calibration.
In document " design method [J] Sichuan war industry journal of the Zhao Xing based on the relevant AGC of intermediate frequency digital that FPGA is realized 2014,35 (2): the amplitude of signal is tracked in 94-96. " using the single order ring after demodulation.In document " Liang Ji；Jiang Zhi base In ofdm system digital AGC algorithm for design [J] modern electronic technology of ring feedback, 2014,37 (3): used in 52-54 " The front and back double loop of signal second moment general power." respect burst signal detection and agc circuit in auspicious monitoring receiver to set in document Meter with realize University of Electronic Science and Technology, it is automatic that the base band that speed third gear is adjustable, is suitable for a variety of baseband bandwidths is had studied in 2014. " Gain control system.In document " estimation of Jiang Chao .OFDM system channel and AGC technical research and its realization University of Electronic Science and Technology One kind is studied in 2013 " based on delay counter and double factor convergence scheme.In document " Wang Tao；Guo Hong；Li Ou；Liu Luo a kind of jade mono- Kind is suitable for adaptive AGC improved method [J] the information engineering college journal of ofdm system, 2011,12 (5): 550-554. " In AGC realized by the controlling mechanism of variable signal compensation coefficient and inertia counter quickly adjust and stable convergence.In text Offer " Wang Xiaoqin；It is black brave；A kind of adaptive automatic growth control strategy [J] electronic letters, vol of all fine jade towards OFDM receiver, 2008,36 (8): the mean absolute error automatic growth control structure of hybrid gain penalty coefficient is devised in 1642-1645. ".
Document above mainly passes through the estimation of signal second moment power and carries out feedforward or feedback power control, uses different controls Step-length, mixed coefficint or multistage adjustment structure processed, do not carry out corresponding power control for ofdm signal time-domain signal characteristic and change Into, these methods under multi-path jamming or when low signal-to-noise ratio cannot effective adjustment signal level, will cause base in OFDM receiver In the demodulating algorithm performance loss of Threshold detection.
Summary of the invention
The technical problem to be solved by the present invention is having overcome the deficiencies of the prior art and provide the ofdm signal based on detection Gain control method, device and recording medium, this method are primarily based on traditional second moment signal power estimation and increase with initial control Benefit is handled, and is then based on the leading symbol that OFDM receiver detects and is extracted the control of precise signal power versus gain in time domain It is modified adjustment, while being based on virtual subnet carrier extract signal power estimated value from data segment and carrying out further gain control tune Whole, to complete the quick and precisely gain control for receiving signal in OFDM data catenary system, this method can be with lower complexity reality Effective promotion of existing gain control accuracy.
The object of the invention is achieved by the following technical programs:
Ofdm signal gain control method based on detection, includes the following steps:
Step 1: calculating gain based on preset initial gain control parameter and the estimation of ofdm signal second moment signal power The error of control tracks signal EA1, while detecting ofdm signal leading symbol data yP(n) and signal y (n) is received；
Step 2: according to the ofdm signal leading symbol data y obtained in step 1P(n), time domain gain control is calculated Error tracks signal EA2；
Step 3: the error for calculating frequency domain gain control tracks signal according to the reception signal y (n) obtained in step 1 EA3。
The above-mentioned ofdm signal gain control method based on detection, the error of gain control tracks signal in the step 1 EA1Are as follows:
In formula
Y (n)=ej[2πvn/N+θ]s(n)+z(n)
Wherein, n is the first ordinal number, and n is integer, 0≤n≤N-1；ArefFor target signal level；N is the length of OFDM symbol Degree, and be positive integer；Y (n) is to receive signal；Z (n) is the noise of channel；θ is channel skew；V is channel frequency deviation；S (n) is Transmitter sends signal；EsFor signal power；H (k) is OFDM symbol channel frequency domain response experienced；K is the second ordinal number, k For integer；X (k) is the frequency-domain expression of ofdm signal modulated signal.
The above-mentioned ofdm signal gain control method based on detection detects OFDM leading symbol data in the step 1 Method are as follows:
In formula
Wherein,For leading symbol initial position estimated value, argmax { } indicates the position of maximizing, and M (d) is detection Measurement, d are third ordinal number, and d is positive integer, and N is the length of OFDM symbol, M2For the second moment of ofdm signal；N is the first sequence Number, n is integer, 0≤n≤N-1；Y (n) is to receive signal；y*(n) conjugation for being y (n)；X (n) is ofdm signal modulated signal Time-domain expression, x*(n) conjugation for being x (n).
The above-mentioned ofdm signal gain control method based on detection, the ofdm signal leading symbol data yP(n) it is divided into The first data segment of ofdm signal leading symbol yP0(n) and the second data segment of ofdm signal leading symbol yP1(n), before ofdm signal Lead the first data segment of symbol yP0(n) and the second data segment of ofdm signal leading symbol yP1(n) identical.
The above-mentioned ofdm signal gain control method based on detection, the error tracking of time domain gain control in the step 2 Signal EA2Are as follows:
Wherein, N is the length of OFDM symbol, and n is the first ordinal number, and n is integer, 0≤n≤N-1；ArefFor echo signal electricity It is flat；yP0It (n) is the first data segment of ofdm signal leading symbol, yP1It (n) is the second data segment of ofdm signal leading symbol.
The above-mentioned ofdm signal gain control method based on detection, the error tracking of the step 3 frequency domain gain control Signal EA3Are as follows:
Wherein, M2For the second moment of ofdm signal；ArefFor target signal level；YvIt (k) be length is NvVirtual subnet carry Wave, k are the second ordinal number, and k is integer.
The above-mentioned ofdm signal gain control method based on detection, the ofdm signal are used for data link system.
The above-mentioned ofdm signal gain control method based on detection, the ofdm signal gain control method based on detection Gain for receiver end controls.
A kind of recording medium has recorded computer-readable program in the recording medium, when which is executed by processor Realize following steps:
Step 1: calculating gain based on preset initial gain control parameter and the estimation of ofdm signal second moment signal power The error of control tracks signal EA1, while detecting ofdm signal leading symbol data yP(n) and signal y (n) is received；
Step 2: according to the ofdm signal leading symbol data y obtained in step 1P(n), time domain gain control is calculated Error tracks signal EA2；
Step 3: the error for calculating frequency domain gain control tracks signal according to the reception signal y (n) obtained in step 1 EA3。
Ofdm signal gain control based on detection, using the ofdm signal gain control method based on detection.
The present invention has the following beneficial effects: compared with the prior art
(1) the present invention is based on the ofdm signal gain control methods of detection, are based on conventional gain control method, joint-detection Time domain preamble signal power afterwards carries out gain control adjustment, improves data link system relative to conventional method and receives signal electricity Flat accuracy；
(2) the present invention is based on the ofdm signal gain control methods of detection, in virtual subcarrier of the frequency domain based on data segment Power carries out gain control adjustment, can obtain more accurate gain control performance with lower complexity；
(3) the present invention is based on the ofdm signal gain control methods of detection, extract from the lead-in cable after detection with data segment Information carries out gain control adjustment, suitable for the dynamic characteristic environment of data link system, ensures in software radio transceiver Validity of the burst signal in Base-Band Processing.
Detailed description of the invention
Fig. 1 is that the present invention is based on the ofdm signal gain control methods of detection in software radio transceiver application block diagram；
Fig. 2 is that the present invention is based on the gain control error performances of the ofdm signal gain control method of detection.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to implementation of the invention Mode is described in further detail.
Fig. 1 is that the present invention is based on the ofdm signal gain control methods of detection in software radio transceiver application block diagram, Radio frequency inputs ofdm signal after gain control module, and baseband output signal enters digital baseband processing unit, by error After the gain control module for tracking signal driving, gain table is controlled by gain pointer, is realized to gain control module State modulator.Wherein, gain control module includes LMT (low-noise amplifier LNA, frequency mixer and trans-impedance amplifier TIA), low pass Filter LPF and digital auto-gain compensative；Gain table respectively corresponds LNA, frequency mixer, TIA, LPF and several parts of number.Using Second order moments estimation gain control error (i.e. the error of gain control tracks signal), error (the i.e. time domain gain of time domain modified gain The error of control tracks signal), frequency domain modified gain error (i.e. the error of frequency domain gain control tracks signal) is common completes to increase Benefit control.
Ofdm signal gain control method based on detection, includes the following steps:
Step 1: calculating gain based on preset initial gain control parameter and the estimation of ofdm signal second moment signal power The error of control tracks signal EA1, while detecting ofdm signal leading symbol data yP(n) and signal y (n) is received.
The error of gain control tracks signal EA1Are as follows:
In formula
Y (n)=ej[2πvn/N+θ]s(n)+z(n)
Wherein,For signal power estimation, M2For the second moment of ofdm signalN is the first ordinal number, n For integer, 0≤n≤N-1；ArefFor target signal level；N is the length of OFDM symbol, and is positive integer；Y (n) is to receive letter Number；Z (n) is the noise of channel；θ is channel skew；V is channel frequency deviation；S (n) is that transmitter sends signal；EsFor signal function Rate；H (k) is OFDM symbol channel frequency domain response experienced；K is the second ordinal number, and k is integer；X (k) is ofdm signal modulation The frequency-domain expression of signal.
The ofdm signal leading symbol data yP(n) it is divided into the first data segment of ofdm signal leading symbol yP0(n) and The second data segment of ofdm signal leading symbol yP1(n), the first data segment of ofdm signal leading symbol yP0(n) and before ofdm signal Lead the second data segment of symbol yP1(n) identical.
The method for detecting OFDM leading symbol data are as follows:
In formula
Wherein,For leading symbol initial position estimated value, argmax { } indicates the position of maximizing, and M (d) is detection Measurement, d are third ordinal number, and d is positive integer, and N is the length of OFDM symbol, M2For the second moment of ofdm signal；N is the first sequence Number, n is integer, 0≤n≤N-1；Y (n) is to receive signal；y*(n) conjugation for being y (n)；X (n) is ofdm signal modulated signal Time-domain expression, x*(n) conjugation for being x (n).According to leading symbol initial position estimated valueIt can be obtained leading symbol to rise Beginning position dPAnd corresponding leading symbol data yP(n)。
Step 2: according to the ofdm signal leading symbol data y obtained in step 1P(n), time domain gain control is calculated Error tracks signal EA2。
The error of time domain gain control tracks signal EA2Are as follows:
Wherein, N is the length of OFDM symbol, and n is the first ordinal number, and n is integer, 0≤n≤N-1；ArefFor echo signal electricity It is flat；yP0It (n) is the first data segment of ofdm signal leading symbol, yP1It (n) is the second data segment of ofdm signal leading symbol.It utilizes The error of time domain gain control tracks signal EA2Realize received signal level adjustment.
Step 3: y (n) transforms to frequency domain by N point Fourier transformation according to the reception signal y (n) obtained in step 1 Y (k), 0≤k≤N-1 are obtained, wherein YvIt (k) be length is NvVirtual subcarrier, YuIt (k) be length is NuModulated signal son Carrier wave, N=Nv+Nu, calculate the error tracking signal E of frequency domain gain controlA3。
The error of frequency domain gain control tracks signal EA3Are as follows:
Wherein, M2For the second moment of ofdm signal；ArefFor target signal level；YvIt (k) be length is NvVirtual subnet carry Wave, k are the second ordinal number, and k is integer.Signal E is tracked using the error of frequency domain gain controlA3Realize received signal level adjustment.
The present invention is based on the ofdm signal gain control methods of detection to track signal E using the error of gain controlA1, time domain The error of gain control tracks signal EA2, frequency domain gain control error track signal EA3It is common to complete gain control.
Ofdm signal gain control method based on detection of the invention, the receiver end that can be used for data link system are realized Gain control.
A kind of recording medium has recorded computer-readable program in the recording medium, when which is executed by processor Realize following steps:
Step 1: calculating gain based on preset initial gain control parameter and the estimation of ofdm signal second moment signal power The error of control tracks signal EA1, while detecting ofdm signal leading symbol data yP(n) and signal y (n) is received.
The error of gain control tracks signal EA1Are as follows:
In formula
Y (n)=ej[2πv/nN+θ]s(n)+z(n)
Wherein,For signal power estimation, M2For the second moment of ofdm signalN is the first ordinal number, n For integer, 0≤n≤N-1；ArefFor target signal level；N is the length of OFDM symbol, and is positive integer；Y (n) is to receive letter Number；Z (n) is the noise of channel；θ is channel skew；V is channel frequency deviation；S (n) is that transmitter sends signal；EsFor signal function Rate；H (k) is OFDM symbol channel frequency domain response experienced；K is the second ordinal number, and k is integer；X (k) is ofdm signal modulation The frequency-domain expression of signal.
The ofdm signal leading symbol data yP(n) it is divided into the first data segment of ofdm signal leading symbol yP0(n) and The second data segment of ofdm signal leading symbol yP1(n), the first data segment of ofdm signal leading symbol yP0(n) and before ofdm signal Lead the second data segment of symbol yP1(n) identical.
The method for detecting OFDM leading symbol data are as follows:
In formula
Wherein,For leading symbol initial position estimated value, argmax { } indicates the position of maximizing, and M (d) is detection Measurement, d are third ordinal number, and d is positive integer, and N is the length of OFDM symbol, M2For the second moment of ofdm signal；N is the first sequence Number, n is integer, 0≤n≤N-1；Y (n) is to receive signal；y*(n) conjugation for being y (n)；X (n) is ofdm signal modulated signal Time-domain expression, x*(n) conjugation for being x (n).According to leading symbol initial position estimated valueIt can be obtained leading symbol to rise Beginning position dPAnd corresponding leading symbol data yP(n)。
Step 2: according to the ofdm signal leading symbol data y obtained in step 1P(n), time domain gain control is calculated Error tracks signal EA2。
The error of time domain gain control tracks signal EA2Are as follows:
Wherein, N is the length of OFDM symbol, and n is the first ordinal number, and n is integer, 0≤n≤N-1；ArefFor echo signal electricity It is flat；yP0It (n) is the first data segment of ofdm signal leading symbol, yP1It (n) is the second data segment of ofdm signal leading symbol.It utilizes The error of time domain gain control tracks signal EA2Realize received signal level adjustment.
Step 3: y (n) transforms to frequency domain by N point Fourier transformation according to the reception signal y (n) obtained in step 1 Y (k), 0≤k≤N-1 are obtained, wherein YvIt (k) be length is NvVirtual subcarrier, YuIt (k) be length is NuModulated signal son Carrier wave, N=Nv+Nu, calculate the error tracking signal E of frequency domain gain controlA3。
The error of frequency domain gain control tracks signal EA3Are as follows:
Wherein, M2For the second moment of ofdm signal；ArefFor target signal level；YvIt (k) be length is NvVirtual subnet carry Wave, k are the second ordinal number, and k is integer.Signal E is tracked using the error of frequency domain gain controlA3Realize received signal level adjustment.
Ofdm signal gain control based on detection, using the ofdm signal gain control method based on detection.
Embodiment 1:
Fig. 2 show the simulation performance of the ofdm signal gain control method the present invention is based on detection, using N=512 long FFT signal, QPSK modulation, emulation is using the gain control error of gain control method of the present invention and using traditional second moment method Gain control error under the awgn channel of SNR=﹣ 10dB~20dB the unitary mismatch, the longitudinal axis be deviation percentage, from Analysis of simulation result promotes 18dB than traditional second moment gain control method it is found that gain of the present invention controls method of adjustment, in SNR Gain control is still accurately carried out when=﹣ 10dB, and traditional second moment gain control method can be only achieved together in SNR > 10dB Etc. performances.
The above, optimal specific embodiment only of the invention, but scope of protection of the present invention is not limited thereto, In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art, It should be covered by the protection scope of the present invention.
The content that description in the present invention is not described in detail belongs to the well-known technique of those skilled in the art.

Claims (10)

1. the ofdm signal gain control method based on detection, characterized by the following steps:
Step 1: calculating gain control based on preset initial gain control parameter and the estimation of ofdm signal second moment signal power Error track signal EA1, while detecting ofdm signal leading symbol data yP(n) and signal y (n) is received；
Step 2: according to the ofdm signal leading symbol data y obtained in step 1P(n), the error of time domain gain control is calculated Track signal EA2；
Step 3: the error for calculating frequency domain gain control tracks signal E according to the reception signal y (n) obtained in step 1A3。
2. the ofdm signal gain control method according to claim 1 based on detection, it is characterised in that: the step 1 The error of middle gain control tracks signal EA1Are as follows:
In formula
Y (n)=ej[2πvn/N+θ]s(n)+z(n)
Wherein, n is the first ordinal number, and n is integer, 0≤n≤N-1；ArefFor target signal level；N is the length of OFDM symbol, and For positive integer；Y (n) is to receive signal；Z (n) is the noise of channel；θ is channel skew；V is channel frequency deviation；S (n) is transmitter Send signal；EsFor signal power；H (k) is OFDM symbol channel frequency domain response experienced；K is the second ordinal number, and k is integer； X (k) is the frequency-domain expression of ofdm signal modulated signal.
3. the ofdm signal gain control method according to claim 1 based on detection, it is characterised in that: the step 1 The method of middle detection OFDM leading symbol data are as follows:
In formula
Wherein,For leading symbol initial position estimated value, argmax { } indicates the position of maximizing, and M (d) is detection measurement, D is third ordinal number, and d is positive integer, and N is the length of OFDM symbol, M2For the second moment of ofdm signal；N is the first ordinal number, and n is Integer, 0≤n≤N-1；Y (n) is to receive signal；y*(n) conjugation for being y (n)；X (n) is the time domain of ofdm signal modulated signal Expression formula, x*(n) conjugation for being x (n).
4. the ofdm signal gain control method according to claim 1 based on detection, it is characterised in that: the OFDM letter Number leading symbol data yP(n) it is divided into the first data segment of ofdm signal leading symbol yP0(n) and ofdm signal leading symbol second Data segment yP1(n), the first data segment of ofdm signal leading symbol yP0(n) and the second data segment of ofdm signal leading symbol yP1(n) It is identical.
5. the ofdm signal gain control method according to claim 1 based on detection, it is characterised in that: the step 2 The error of middle time domain gain control tracks signal EA2Are as follows:
Wherein, N is the length of OFDM symbol, and n is the first ordinal number, and n is integer, 0≤n≤N-1；ArefFor target signal level；yP0 It (n) is the first data segment of ofdm signal leading symbol, yP1It (n) is the second data segment of ofdm signal leading symbol.
6. the ofdm signal gain control method according to claim 1 based on detection, it is characterised in that: the step 3 The error of frequency domain gain control tracks signal EA3Are as follows:
Wherein, M2For the second moment of ofdm signal；ArefFor target signal level；YvIt (k) be length is NvVirtual subcarrier, k For the second ordinal number, k is integer.
7. the ofdm signal gain control method according to claim 1 based on detection, it is characterised in that: the OFDM letter Number be used for data link system.
8. the ofdm signal gain control method according to claim 1 based on detection, it is characterised in that: described based on inspection Gain of the ofdm signal gain control method of survey for receiver end controls.
9. a kind of recording medium, it is characterised in that: have recorded computer-readable program in the recording medium, the program is processed Device realizes following steps when executing:
Step 1: calculating gain control based on preset initial gain control parameter and the estimation of ofdm signal second moment signal power Error track signal EA1, while detecting ofdm signal leading symbol data yP(n) and signal y (n) is received；
Step 2: according to the ofdm signal leading symbol data y obtained in step 1P(n), the error of time domain gain control is calculated Track signal EA2；
Step 3: the error for calculating frequency domain gain control tracks signal E according to the reception signal y (n) obtained in step 1A3。
10. the ofdm signal gain control based on detection, it is characterised in that: using any described in claim 1~8 Ofdm signal gain control method based on detection.
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