CN107979558A - A kind of iteration detection method of the double fluid CE-OFDM systems based on width phase demodulator - Google Patents
A kind of iteration detection method of the double fluid CE-OFDM systems based on width phase demodulator Download PDFInfo
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- CN107979558A CN107979558A CN201711226031.9A CN201711226031A CN107979558A CN 107979558 A CN107979558 A CN 107979558A CN 201711226031 A CN201711226031 A CN 201711226031A CN 107979558 A CN107979558 A CN 107979558A
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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
- H04L27/2614—Peak power aspects
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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
- H04L27/2649—Demodulators
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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
- H04L27/2649—Demodulators
- H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
Abstract
The invention discloses a kind of iteration detection method of the double fluid CE ofdm systems based on width phase demodulator, belong to wireless communication field；The bit data flow of transmitting terminal is modulated into two-way CE ofdm signals first, is superimposed and sent using phase shift；Receiving terminal calculates two estimation real-valued signals by frequency domain equalizer and width phase demodulator and stores, and obtains reconstruct through DFT, hard decision, IDFT conversion and phase-modulation after and sends signal, and is overlapped using phase shift multiplexing method；Signal after superposition is calculated to the mean square error for receiving signal, and is stored into final storage variable SE；Signal combination width phase demodulator is sent using reconstruct at the same time and be iterated detection, made decisions with the value in final storage variable SE, demodulate final two paths of signals.Method of the present invention is on the basis of signal low peak average ratio is maintained, and transmitting terminal recovers double-current symbol by the method that phase shift is superimposed using 2N+2 sub- 2N complex data symbols of carrier-wave transmission, receiving terminal so that receiving terminal can have better performance when big phase-modulation.
Description
Technical field
The present invention relates to wireless communication field, CE-OFDM systems (the permanent envelope orthogonal frequency applied to broadband wireless communications
Multiplex system) the demodulation of baseband signal receiving terminal, be specifically that a kind of iteration of double fluid CE-OFDM systems based on width phase demodulator is examined
Survey method.
Background technology
In a broadband wireless communication system, information reaches receiver by the electromagnetic wave modulated in space propagation.Due to
Complicated communication environment influences electromagnetic wave reflected in space propagation, diffusion and scattering etc., can be produced at receiver
The reception signal of multichannel different delay and signal strength, makes communication channel have the frequency selective fading characteristic of time-varying.
In order to effectively eliminate the frequency selective fading of broadband communication channel, broad-band channel is divided into by multi-carrier modulation technology
More sub-channels, are modulated using a subcarrier on each of the sub-channels, and each subcarrier parallel transmission.In this way, to the greatest extent
Managing total channel is non-flat forms and has frequency selectivity, but is relatively flat per sub-channels.
Orthogonal Frequency Division Multiplexing (OFDM) is one kind of multi-carrier modulation technology, mutually orthogonal between its subcarrier, is had very high
The availability of frequency spectrum；And multicarrier can be replaced using inverse discrete fourier transform/discrete Fourier transform (IDFT/DFT)
Modulation and demodulation, are realized efficient.But in ofdm system send data IFFT processing make composite signal be possible to produce it is bigger
Peak power so that the power peak of ofdm signal with average ratio (PAPR) greatly, cause the power efficiency of radio frequency amplifier compared with
It is low, it is therefore desirable to study the multi-transceiver technology of low PAPR, such as permanent envelope Orthogonal Frequency Division Multiplexing (CE-OFDM) technology.
CE-OFDM technologies can reduce PAPR, its signal has constant envelope, be conducive to transmitter using non-linear big
Power power amplifier.Current this modulator approach will be carried out at IDFT after being built into center conjugate symmetric data by will send signal
Reason, obtains purely real sequence, and carrying out phase-modulation with the sequence obtains permanent envelope transmission signal.But since conjugate pair claims step
Presence, transmitting N number of complex symbol (such as quadrature amplitude modulation (QAM)) in CE-OFDM systems needs 2N+2 subcarrier, therefore
Its spectrum efficiency is less than the 50% of ofdm system, and therefore, it is difficult to meet the message transmission rate demand of broadband connections.
The content of the invention
The present invention causes the message transmission rate of broadband connections since spectrum efficiency is low to solve in CE-OFDM systems
Demand is difficult to meet, it is proposed that a kind of iteration detection method of the double fluid CE-OFDM systems based on width phase demodulator.
Comprise the following steps that：
Step 1: being directed to system of broadband wireless communication, two-way bit data flow is modulated to two-way CE- by transmitting terminal respectively
Ofdm signal；
Comprise the following steps that：
Step 101, by two-way bit data flow d1,mAnd d2,mAs double-current signal, it is changed into after carrying out symbol mapping respectivelySignal；N is symbol numbers waiting for transmission.
Step 102, to symbol map afterSignal constructs conjugate sequence S respectivelyi,n；
0Nidft-2-2NIt is that a length is Nidft0 sequence of -2-2N, NidftFor the length of IDFT conversion；N=0,1 ...,
Nidft-1。
Step 103, by conjugate sequence Si,nAfter making IDFT conversion respectively, frequency-region signal is respectively converted into time-domain signal
si,n；
Step 104, to time-domain signal si,nPhase-modulation is carried out respectively, obtains two-way CE-OFDM signals xi,n；
xi,n=Ai exp(j2πhisi,n)
AiRepresent the amplitude of road CE-OFDM signals；hiRepresent the phase modulation factor of road CE-OFDM signals.
Step 2: to two-way CE-OFDM signals xi,nIt is superimposed using phase shift, obtains double-current CE-OFDM signalsAnd add guarantor
Shield interval is sent to receiving terminal；
First via CE-OFDM signals are made into real part, the second road CE-OFDM signals make imaginary part construction double fluid CE-OFDM signals
A number removal protection interval Step 3: receiving terminal docking is collected mail, by double-current CE-OFDM signalsIt is sent to frequency domain equalizer
Obtain signal yn；
A represents double fluid CE-OFDM signals real part and the carrier-signal amplitude of imaginary part, and 2 π h represent two-way CE-OFDM signals
Phase modulation coefficient, wnIt is that average is 0, variance σ2White Gauss noise.
Signal y is received Step 4: being calculated using width phase demodulatornCorresponding two estimations real-valued signal
First, the reception signal y after frequency domain equalizer is calculatednReal and imaginary parts；
Then, using receiving signal ynReal and imaginary parts further calculate the amplitude of the signalAnd phase
For the amplitude influences of the noise docking collection of letters number；υnFor the phase effect of the noise docking collection of letters number.
Finally, by amplitudeAnd phaseIn channel white noise influence ignore after, calculate receiving terminal estimation two realities
Value signal
Step 5: two real-valued signals by estimationIt is respectively stored into final output variableWithIn；
Step 6: by two real-valued signalsHard decision is carried out after DFT to obtainIt is and rightIt is laggard to make IDFT conversion
Row phase-modulation obtains reconstruct and sends signal
Wherein,
Step 7: utilize two current reconstruction signalsIt is overlapped by the phase shift multiplexing method of transmitting terminal；
Step 8: utilize the signal after superpositionThe mean square error for receiving signal is calculated, and is stored to final storage variable
In SE.
Step 9: send signal using reconstructDetection is iterated with reference to width phase demodulator, demodulates final two-way
Signal；
Comprise the following steps that：
Step 901, initial setting up iterations are p=1, maximum iteration Iter；
The signal y of step 902, input after frequency domain equalizernThe transmission signal currently reconstructedTwo are calculated to connect
The collection of letters number
The transmission signal currently reconstructedInitial value is the result of step 6.
Step 903, judge whether iterations reaches maximum, if so, terminating iterative process, enters step 909；It is no
Then, 904 are entered step；
Step 904, calculate reception signal using width phase demodulatorCorresponding two estimations real-valued signal
Step 905, by two real-valued signalsHard decision is carried out after DFT to obtainIt is and rightMake IDFT conversion
Phase-modulation is carried out afterwards obtains reconstruct transmission signal
Wherein,
Step 906, utilize two current reconstruction signalsIt is overlapped by the phase shift multiplexing method of transmitting terminal；
Step 907, utilize the signal after superpositionThe mean square error for receiving signal is calculated, and stores and arrives intermediate storage variable
SEtempIn.
Step 908, judge whether SE ＞ SEtemp, if so, by SEtempValue storage into final storage variable SE, together
When by SEtempCorresponding two estimations real-valued signalIt is respectively stored into final output variableWithIn；Otherwise, repeatedly
Generation number adds 1, return to step 902；
The final output variable of step 909, outputWithIn value be iteration final result.
Step 910, to iteration final resultWithDFT transform is done, is obtainedWith
Step 911, by after DFT transformWithIn useful signal partWithTake out；
Step 912, to taking-upWithSignal does hard decision and obtains final transmission signal respectively.
Beneficial effects of the present invention are as follows：
The high PAPR problems present in the existing multi-transceiver technology, it is proposed that one kind is based on permanent envelope orthogonal frequency division multiplexing
With the data multiplexing technique of modulator approach, launch signal by being constructed in transmitting terminal, the method in receiving terminal using iterative detection,
So that having more preferable system performance in big phase-modulation compared to the receiving terminal using Taylor series expansion, can effectively improve
Receiving terminal performance.
Brief description of the drawings
Fig. 1 is the transmitting terminal process chart of single antenna double fluid CE-OFDM systems of the present invention；
Fig. 2 is the receiving terminal process chart of single antenna double fluid CE-OFDM systems of the present invention；
Fig. 3 is a kind of iteration detection method flow chart of the double fluid CE-OFDM systems based on width phase demodulator of the present invention；
Fig. 4 is the method flow diagram that the present invention sends signal combination width phase demodulator iterative detection using reconstruct.
Embodiment
The specific implementation method of the present invention is described in detail below in conjunction with the accompanying drawings.
The present invention proposes a kind of single antenna double fluid data sink design method based on CE-OFDM systems
(Iterative Detection With Amplitude-Phase Demodulator for Dual streams CE-
OFDM)；On the basis of signal low peak average ratio is maintained, transmitting terminal is carried this method by the method that phase shift is superimposed using 2N+2 son
Ripple transmits 2N complex data symbols, and signal is recovered double-current symbol by receiving terminal using the iterative detection based on width phase demodulator
Number so that receiving terminal can have better performance when big phase-modulation.
As shown in figure 3, comprise the following steps that：
Step 1: being directed to system of broadband wireless communication, two-way bit data flow is modulated to two-way CE- by transmitting terminal respectively
Ofdm signal；
As shown in Figure 1, comprise the following steps that：
Step 101, by two-way bit data flow d1,mAnd d2,mAs double-current signal, it is changed into after carrying out symbol mapping respectivelySignal；
I ∈ { 1,2 },N is symbol numbers waiting for transmission.
Step 102, to symbol map afterSignal constructs conjugate sequence S respectivelyi,n；
It is real-valued signal to make the signal that phase-modulator receives, constructs conjugate sequence as the following formula,
It is that length is Nidft0 sequence of -2-2N, NidftFor the length of IDFT conversion；N=0,1 ..., Nidft-
1.Zero padding does over-sampling after IDFT equivalent to time-domain signal in high frequency subcarriers, does not interfere with spectrum efficiency and symbol
Duration.Therefore 2N+2 subcarrier is taken on frequency domain per road signal it can be seen from formula (1) and sends N number of symbol, therefore
The 50% of OFDM technology is will be less than per spectrum efficiency all the way.
At this time, the over-sampling multiple F of systemOS=Nidft/(2N+2)。
Step 103, by conjugate sequence Si,nAfter making IDFT conversion respectively, frequency-region signal is respectively converted into time-domain signal
si,n；
Step 104, to time-domain signal si,nPhase-modulation is carried out respectively, obtains two-way CE-OFDM signals xi,n；
xi,n=Ai exp(j2πhisi,n) (3)
AiRepresent the amplitude of road CE-OFDM signals；hiRepresent the phase modulation factor of road CE-OFDM signals.For convenience
For the sake of, it is assumed that the amplitude of two paths of signals is identical with phase modulation factor.
Step 2: to two-way CE-OFDM signals xi,nIt is superimposed using phase shift, obtains double-current CE-OFDM signalsAnd add guarantor
Shield interval is sent to receiving terminal；
Using as shown in following formula (4) phase shift be superimposed data multiplexing method, by first via CE-OFDM signals make real part,
Second road CE-OFDM signals make imaginary part construction double fluid CE-OFDM signals
It can be seen from the above that the signal that sends of transmitting terminal is superimposed for the phase shift of two paths of signals, 2N+2 son is taken on frequency domain and is carried
Ripple, have sent 2N symbol, and spectrum efficiency is doubled compared to single channel CE-OFDM, the basic phase of spectrum efficiency with OFDM
Together.But the PAPR that OFDM sends signal is related with the number of sub carrier wave N taken, theoretic highest PAPR is 10log10(N)
DB, and the superposition that signal is two-way CE-OFDM signals is sent in the present invention, the PAPR per road signal is 0dB, then sends signal
PAPR is up to 3dB, unrelated with the number of sub carrier wave that every road signal takes.
A number removal protection interval Step 3: receiving terminal docking is collected mail, by double-current CE-OFDM signalsIt is sent to frequency domain equalizer
Obtain signal yn；
As illustrated in fig. 2, it is assumed that preferable channel condition information can be obtained, then the signal crossed after frequency domain equalizer can state
For：
A represents double fluid CE-OFDM signals real part and the carrier-signal amplitude of imaginary part, and 2 π h represent two-way CE-OFDM signals
Phase modulation coefficient, wnIt is that average is 0, variance σ2White Gauss noise.
Signal y is received Step 4: being calculated using width phase demodulatornCorresponding two estimations real-valued signal
First, the reception signal y after frequency domain equalizer is calculatednReal and imaginary parts；
Then, using receiving signal ynReal and imaginary parts further calculate the amplitude of the signalAnd phase
For the amplitude influences of the noise docking collection of letters number；υnFor the phase effect of the noise docking collection of letters number.
Finally, by amplitude ρynAnd phaseynIn channel white noise influence ignore after, calculate receiving terminal estimation two
Real-valued signal
First, the influence of noise in formula (7) is ignored, then formula (7) is changed into：
Then, the real-valued signal of receiving terminal estimation is calculatedCan be in the hope of：
Step 5: two real-valued signals by estimationIt is respectively stored into final output variableWithIn；
Step 6: by two real-valued signalsHard decision is carried out after DFT to obtainIt is and rightIt is laggard to make IDFT conversion
Row phase-modulation obtains reconstruct and sends signal
Wherein,
Step 7: utilize two current reconstruction signalsIt is overlapped by the phase shift multiplexing method of transmitting terminal；
Step 8: utilize the signal after superpositionThe mean square error for receiving signal is calculated, and is stored to final storage variable
In SE.
Step 9: send signal using reconstructDetection is iterated with reference to width phase demodulator, demodulates final two-way
Signal；
As shown in figure 4, comprise the following steps that：
Step 901, initial setting up iterations are p=1, maximum iteration Iter；
The signal y of step 902, input after frequency domain equalizernThe transmission signal currently reconstructedTwo are calculated to connect
The collection of letters number
The transmission signal currently reconstructedInitial value is the result of step 6.
In formula,WithIt is expressed as：
Step 903, judge whether iterations reaches maximum, if so, terminating iterative process, enters step 909；It is no
Then, 904 are entered step；
Step 904, calculate reception signal using width phase demodulatorCorresponding two estimations real-valued signal
Step 905, by two real-valued signalsHard decision is carried out after DFT to obtainIt is and rightMake IDFT conversion
Phase-modulation is carried out afterwards obtains reconstruct transmission signal
Wherein,
Step 906, utilize two current reconstruction signalsIt is overlapped by the phase shift multiplexing method of transmitting terminal；
Step 907, utilize the signal after superpositionThe mean square error for receiving signal is calculated, and stores and arrives intermediate storage variable
SEtempIn.
Step 908, judge whether SE ＞ SEtemp, if so, by SEtempValue storage into final storage variable SE, together
When by SEtempCorresponding two estimations real-valued signalIt is respectively stored into final output variableWithIn；Otherwise, repeatedly
Generation number adds 1, return to step 902；
The final output variable of step 909, outputWithIn value be iteration final result.
Step 910, to iteration final resultWithDFT transform is done, is obtainedWith
Step 911, by after DFT transformWithIn useful signal partWithTake out；
Step 912, to taking-upWithSignal does hard decision and obtains final transmission signal respectively.
In above-mentioned flow, it is not difficult to find out, in formula (13), contains noise item and the residual error as caused by noise,
And these residual errors are continued using carrying out undated parameter in the circulating cycle, meanwhile, mean square error can also be regarded as comprising noise
And residual error energy synthesis, under the decision method of lowest mean square, while reducing its influence produced.
Claims (3)
1. a kind of iteration detection method of the double fluid CE-OFDM systems based on width phase demodulator, it is characterised in that specific steps are such as
Under：
Step 1: be directed to system of broadband wireless communication, transmitting terminal is by two-way bit data flow d1,mAnd d2,mTwo-way is modulated to respectively
CE-OFDM signals x1,nAnd x2,n；
Step 2: being superimposed to two-way CE-OFDM signals using phase shift, double-current CE-OFDM signals x is obtainednAnd add protection interval hair
Give receiving terminal；
First via CE-OFDM signals are made into real part, the second road CE-OFDM signals make imaginary part construction double fluid CE-OFDM signals
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The index of modulation, wnIt is that average is 0, variance σ2White Gauss noise；si,nFor two-way time-domain signal, i ∈ { 1,2 }.
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Comprise the following steps that：
Step 901, initial setting up iterations are p=1, maximum iteration Iter；
The signal y of step 902, input after frequency domain equalizernThe transmission signal currently reconstructedCalculate two and receive letter
Number
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<mrow>
<msub>
<mi>s</mi>
<mrow>
<mn>2</mn>
<mo>,</mo>
<mi>n</mi>
</mrow>
</msub>
<mo>-</mo>
<msub>
<mover>
<mi>s</mi>
<mo>&OverBar;</mo>
</mover>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mi>n</mi>
</mrow>
</msub>
</mrow>
<mo>)</mo>
<mo>)</mo>
</mrow>
<mo>+</mo>
<mfrac>
<mn>1</mn>
<mi>A</mi>
</mfrac>
<msub>
<mover>
<mi>w</mi>
<mo>&OverBar;</mo>
</mover>
<mi>n</mi>
</msub>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mo>=</mo>
<mi>exp</mi>
<mrow>
<mo>(</mo>
<mi>j</mi>
<mn>2</mn>
<msubsup>
<mi>&pi;h&eta;</mi>
<mrow>
<mn>1</mn>
<mo>,</mo>
<mi>n</mi>
</mrow>
<mrow>
<mo>(</mo>
<mi>i</mi>
<mo>)</mo>
</mrow>
</msubsup>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mi>j</mi>
<mi>exp</mi>
<mrow>
<mo>(</mo>
<mi>j</mi>
<mn>2</mn>
<msubsup>
<mi>&pi;h&eta;</mi>
<mrow>
<mn>2</mn>
<mo>,</mo>
<mi>n</mi>
</mrow>
<mrow>
<mo>(</mo>
<mi>i</mi>
<mo>)</mo>
</mrow>
</msubsup>
<mo>)</mo>
</mrow>
<mo>+</mo>
<mfrac>
<mn>1</mn>
<mi>A</mi>
</mfrac>
<msub>
<mover>
<mi>w</mi>
<mo>&OverBar;</mo>
</mover>
<mi>n</mi>
</msub>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
The transmission signal currently reconstructedInitial value is the result of step 6；
Step 903, judge whether iterations reaches maximum, if so, terminating iterative process, enters step 909；Otherwise, into
Enter step 904；
Step 904, calculate reception signal using width phase demodulatorCorresponding two estimations real-valued signal
Step 905, by two real-valued signalsHard decision is carried out after DFT to obtainIt is and rightIt is laggard to make IDFT conversion
Row phase-modulation obtains reconstruct and sends signal
<mrow>
<msub>
<mover>
<mi>x</mi>
<mo>^</mo>
</mover>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mi>n</mi>
</mrow>
</msub>
<mo>=</mo>
<mi>A</mi>
<mi>exp</mi>
<mrow>
<mo>(</mo>
<mi>j</mi>
<mn>2</mn>
<mi>&pi;</mi>
<mi>h</mi>
<msub>
<mover>
<mi>s</mi>
<mo>&OverBar;</mo>
</mover>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mi>n</mi>
</mrow>
</msub>
<mo>)</mo>
</mrow>
</mrow>
Wherein,
Step 906, utilize two current reconstruction signalsIt is overlapped by the phase shift multiplexing method of transmitting terminal；
<mrow>
<msub>
<mover>
<mi>x</mi>
<mo>^</mo>
</mover>
<mi>n</mi>
</msub>
<mo>=</mo>
<msub>
<mover>
<mi>x</mi>
<mo>^</mo>
</mover>
<mrow>
<mn>1</mn>
<mo>,</mo>
<mi>n</mi>
</mrow>
</msub>
<mo>-</mo>
<mi>j</mi>
<msub>
<mover>
<mi>x</mi>
<mo>^</mo>
</mover>
<mrow>
<mn>2</mn>
<mo>,</mo>
<mi>n</mi>
</mrow>
</msub>
</mrow>
Step 907, utilize the signal after superpositionThe mean square error for receiving signal is calculated, and stores and arrives intermediate storage variable SEtemp
In.
<mrow>
<msub>
<mi>SE</mi>
<mrow>
<mi>t</mi>
<mi>e</mi>
<mi>m</mi>
<mi>p</mi>
</mrow>
</msub>
<mo>=</mo>
<munder>
<mo>&Sigma;</mo>
<mi>n</mi>
</munder>
<mo>|</mo>
<msub>
<mi>y</mi>
<mi>n</mi>
</msub>
<mo>-</mo>
<msub>
<mover>
<mi>x</mi>
<mo>^</mo>
</mover>
<mi>n</mi>
</msub>
<msup>
<mo>|</mo>
<mn>2</mn>
</msup>
</mrow>
Step 908, judge whether SE ＞ SEtemp, if so, by SEtempValue storage into final storage variable SE, at the same time will
SEtempCorresponding two estimations real-valued signalIt is respectively stored into final output variableWithIn；Otherwise, iteration time
Number plus 1, return to step 902；
The final output variable of step 909, outputWithIn value be iteration final result；
Step 910, to iteration final resultWithDFT transform is done, is obtainedWith
<mrow>
<msub>
<mover>
<mi>S</mi>
<mo>^</mo>
</mover>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mi>n</mi>
</mrow>
</msub>
<mo>=</mo>
<mi>D</mi>
<mi>F</mi>
<mi>T</mi>
<mo>&lsqb;</mo>
<msub>
<mover>
<mi>s</mi>
<mo>^</mo>
</mover>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mi>n</mi>
</mrow>
</msub>
<mo>&rsqb;</mo>
<mo>,</mo>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
<mo>,</mo>
<mn>2</mn>
</mrow>
Step 911, by after DFT transformWithIn useful signal partWithTake out；
<mrow>
<msub>
<mover>
<mi>Y</mi>
<mo>^</mo>
</mover>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mi>n</mi>
</mrow>
</msub>
<mo>=</mo>
<msub>
<mover>
<mi>S</mi>
<mo>^</mo>
</mover>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mi>n</mi>
<mo>+</mo>
<mn>1</mn>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
<mo>,</mo>
<mn>2</mn>
<mo>;</mo>
<mi>n</mi>
<mo>=</mo>
<mn>0</mn>
<mo>,</mo>
<mn>1</mn>
<mo>,</mo>
<mn>...</mn>
<mo>,</mo>
<mi>N</mi>
<mo>-</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
</mrow>
Step 912, to taking-upWithSignal does hard decision and obtains final transmission signal respectively.
2. a kind of iteration detection method of the double fluid CE-OFDM systems based on width phase demodulator as claimed in claim 1, its feature
It is, the step one is specially：
Step 101, by two-way bit data flow d1,mAnd d2,mAs double-current signal, it is changed into after carrying out symbol mapping respectivelyLetter
Number；
I ∈ { 1,2 },N is symbol numbers waiting for transmission.
Step 102, to symbol map afterSignal constructs conjugate sequence S respectivelyi,n；
<mrow>
<msub>
<mi>S</mi>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mi>n</mi>
</mrow>
</msub>
<mo>=</mo>
<mo>&lsqb;</mo>
<mn>0</mn>
<mo>,</mo>
<msub>
<mi>q</mi>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mn>1</mn>
</mrow>
</msub>
<mo>,</mo>
<msub>
<mi>q</mi>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mn>2</mn>
</mrow>
</msub>
<mo>,</mo>
<mn>...</mn>
<mo>,</mo>
<msub>
<mi>q</mi>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mi>N</mi>
</mrow>
</msub>
<mo>,</mo>
<msub>
<mn>0</mn>
<mrow>
<msub>
<mi>N</mi>
<mrow>
<mi>i</mi>
<mi>d</mi>
<mi>f</mi>
<mi>t</mi>
</mrow>
</msub>
<mo>-</mo>
<mn>2</mn>
<mo>-</mo>
<mn>2</mn>
<mi>N</mi>
</mrow>
</msub>
<mo>,</mo>
<mn>0</mn>
<mo>,</mo>
<msubsup>
<mi>q</mi>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mi>N</mi>
</mrow>
<mo>*</mo>
</msubsup>
<mo>,</mo>
<mn>...</mn>
<mo>,</mo>
<msubsup>
<mi>q</mi>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mn>2</mn>
</mrow>
<mo>*</mo>
</msubsup>
<mo>,</mo>
<msubsup>
<mi>q</mi>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mn>1</mn>
</mrow>
<mo>*</mo>
</msubsup>
<mo>&rsqb;</mo>
</mrow>
It is that a length is Nidft0 sequence of -2-2N, NidftFor the length of IDFT conversion；
N=0,1 ..., Nidft-1。
Step 103, by conjugate sequence Si,nAfter making IDFT conversion respectively, frequency-region signal is respectively converted into time-domain signal si,n；
<mrow>
<msub>
<mi>s</mi>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mi>n</mi>
</mrow>
</msub>
<mo>=</mo>
<mi>I</mi>
<mi>D</mi>
<mi>F</mi>
<mi>T</mi>
<mrow>
<mo>(</mo>
<msub>
<mi>S</mi>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mi>n</mi>
</mrow>
</msub>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<msqrt>
<msub>
<mi>N</mi>
<mrow>
<mi>i</mi>
<mi>d</mi>
<mi>f</mi>
<mi>t</mi>
</mrow>
</msub>
</msqrt>
</mfrac>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>k</mi>
<mo>=</mo>
<mn>0</mn>
</mrow>
<mrow>
<msub>
<mi>N</mi>
<mrow>
<mi>i</mi>
<mi>d</mi>
<mi>f</mi>
<mi>t</mi>
</mrow>
</msub>
<mo>-</mo>
<mn>1</mn>
</mrow>
</munderover>
<msub>
<mi>S</mi>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mi>k</mi>
</mrow>
</msub>
<msup>
<mi>e</mi>
<mrow>
<mi>j</mi>
<mn>2</mn>
<mi>&pi;</mi>
<mi>n</mi>
<mi>k</mi>
<mo>/</mo>
<msub>
<mi>N</mi>
<mrow>
<mi>i</mi>
<mi>d</mi>
<mi>f</mi>
<mi>t</mi>
</mrow>
</msub>
</mrow>
</msup>
</mrow>
Step 104, to time-domain signal si,nPhase-modulation is carried out respectively, obtains two-way CE-OFDM signals xi,n；
xi,n=Ai exp(j2πhisi,n)
AiRepresent the amplitude of road CE-OFDM signals；hiRepresent the phase modulation factor of road CE-OFDM signals.
3. a kind of iteration detection method of the double fluid CE-OFDM systems based on width phase demodulator as claimed in claim 1, its feature
It is, the step four is specially：
First, the reception signal y after frequency domain equalizer is calculatednReal and imaginary parts；
Then, using receiving signal ynReal and imaginary parts further calculate the amplitude of the signalAnd phase
<mrow>
<msub>
<mi>&rho;</mi>
<msub>
<mi>y</mi>
<mi>n</mi>
</msub>
</msub>
<mo>=</mo>
<msqrt>
<mrow>
<msup>
<mi>A</mi>
<mn>2</mn>
</msup>
<mrow>
<mo>(</mo>
<mn>2</mn>
<mo>-</mo>
<mn>2</mn>
<mi>s</mi>
<mi>i</mi>
<mi>n</mi>
<mo>(</mo>
<mn>2</mn>
<mi>&pi;</mi>
<mi>h</mi>
<mo>(</mo>
<msub>
<mi>s</mi>
<mrow>
<mn>1</mn>
<mo>,</mo>
<mi>n</mi>
</mrow>
</msub>
<mo>-</mo>
<msub>
<mi>s</mi>
<mrow>
<mn>2</mn>
<mo>,</mo>
<mi>n</mi>
</mrow>
</msub>
<mo>)</mo>
</mrow>
<mo>)</mo>
<mo>)</mo>
<mo>+</mo>
<msub>
<mover>
<mi>A</mi>
<mo>&OverBar;</mo>
</mover>
<mrow>
<mi>w</mi>
<mo>,</mo>
<mi>n</mi>
</mrow>
</msub>
</mrow>
</msqrt>
</mrow>
<mrow>
<msub>
<mi>&phi;</mi>
<msub>
<mi>y</mi>
<mi>n</mi>
</msub>
</msub>
<mo>=</mo>
<mrow>
<mo>(</mo>
<mi>&pi;</mi>
<mi>h</mi>
<mo>(</mo>
<mrow>
<msub>
<mi>s</mi>
<mrow>
<mn>1</mn>
<mo>,</mo>
<mi>n</mi>
</mrow>
</msub>
<mo>+</mo>
<msub>
<mi>s</mi>
<mrow>
<mn>2</mn>
<mo>,</mo>
<mi>n</mi>
</mrow>
</msub>
</mrow>
<mo>)</mo>
<mo>-</mo>
<mfrac>
<mi>&pi;</mi>
<mn>4</mn>
</mfrac>
<mo>)</mo>
</mrow>
<mo>+</mo>
<msub>
<mi>&upsi;</mi>
<mi>n</mi>
</msub>
</mrow>
For the amplitude influences of the noise docking collection of letters number；υnFor the phase effect of the noise docking collection of letters number.
Finally, by amplitudeAnd phaseIn channel white noise influence ignore after, calculate receiving terminal estimation two real values letter
Number
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| CN113938207A (en) * | 2021-10-15 | 2022-01-14 | 湖南师范大学 | Signal processing method applied to optical non-Hermite symmetric OFDM receiver |
| CN114826424A (en) * | 2022-04-29 | 2022-07-29 | 广东工业大学 | Method and system for recovering multidimensional multiplexing signal based on weight decision feedback |
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Cited By (5)
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| CN109412995A (en) * | 2018-11-29 | 2019-03-01 | 北京邮电大学 | The quasi- permanent envelope multicarrier transmitting method of multithread based on variable sub carriers bandwidth |
| CN113938207A (en) * | 2021-10-15 | 2022-01-14 | 湖南师范大学 | Signal processing method applied to optical non-Hermite symmetric OFDM receiver |
| CN113938207B (en) * | 2021-10-15 | 2023-02-24 | 湖南师范大学 | Signal processing method applied to optical non-Hermite symmetric OFDM receiver |
| CN114826424A (en) * | 2022-04-29 | 2022-07-29 | 广东工业大学 | Method and system for recovering multidimensional multiplexing signal based on weight decision feedback |
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