CN108737317B - Generalized mixed carrier frequency-selective channel transmission method - Google Patents
Generalized mixed carrier frequency-selective channel transmission method Download PDFInfo
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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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
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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
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Abstract
A generalized mixed carrier frequency selection channel transmission method relates to the field of wireless communication and aims to solve the problem that a classic mixed carrier system based on weighted fractional Fourier transform only has performance advantages under time-frequency double-selection channels, but the performance is inferior to that of a single carrier system under channels mainly based on frequency selective fading. The transmission method comprises the following steps: the method comprises the steps of firstly selecting four angle parameters meeting the transmission conditions of a generalized mixed carrier frequency selection channel, and respectively calculating forward and inverse transformation weighting coefficients of a time domain component and a time domain inverse component by utilizing a generalized mixed carrier system time domain component and time domain inverse component forward and inverse transformation weighting coefficient calculation method. And then, the time domain component and the time domain reversal component of the modulated signal are subjected to weighted forward transformation at a transmitting end by using a forward transformation coefficient, and the signal after the forward transformation is transmitted through an antenna. After receiving the signal, the receiving end performs weighted inverse transformation on the time domain component and the time domain reverse component of the received signal by using the inverse transformation coefficient, and judges the inverse transformation result, thereby obtaining the original sending signal. The invention is suitable for the wireless communication process.
Description
Technical Field
The present invention relates to the field of wireless communications.
Background
The classical mixed carrier system is realized based on a four-item weighted fractional Fourier transform theory. Under the time-frequency double-dispersion channel, the classical mixed carrier system can obtain the error code performance superior to the traditional single carrier system and multi-carrier system. However, in a frequency selective fading channel with large multipath delay and small doppler effect, the frequency domain component in the mixed carrier is not adapted to the frequency selective channel, so that the error code performance of the mixed carrier system in the frequency selective channel is not as excellent as that of the single carrier system. This limits, to a certain extent, the use of mixed carriers in communication systems.
Disclosure of Invention
The invention provides a generalized mixed carrier frequency selection channel transmission method in order to solve the problem that a classical mixed carrier system is poor in performance under a frequency selection channel.
The generalized mixed carrier frequency-selective channel transmission method is characterized in that: it comprises the following steps:
step one, selecting four angle parameters theta meeting generalized mixed carrier frequency selection channel transmission conditions0、θ1、θ2And theta3(ii) a Theta is described0,θ1,θ2,θ3∈[0,2π)；
Step two, according to the method for calculating the forward conversion weighting coefficient of the time domain component and the time domain reversal component of the generalized mixed carrier system, the forward conversion weighting coefficient w of the time domain component and the time domain reversal component is calculated by utilizing the four angle parameters selected in the step one0And w1；
Step three, according to the inverse transformation weighting coefficient calculation method of the time domain component and the time domain reversal component of the generalized mixed carrier system, the inverse transformation weighting coefficient of the time domain component and the time domain reversal component is calculated by utilizing the four angle parameters selected in the step one
And
modulating a signal to be transmitted, and dividing the signal into data blocks with the length of N, wherein each data block is called a frame; n is a positive integer;
step five, using the forward transform weighting coefficient calculated in the step two, the transmitting end carries out weighted forward transform on each frame data in the step four according to a generalized mixed carrier system time domain signal and time domain reversal signal weighted forward transform method, and transmits the transformed signal through an antenna;
sixthly, by using the inverse transformation weighting coefficient calculated in the third step, the receiving end carries out inverse weighting transformation on the received data according to the inverse weighting transformation method of the time domain signal and the time domain reversal signal of the generalized mixed carrier system;
and step seven, the receiving end judges the signals subjected to the weighting inverse transformation in the step six, so that the information sent by the sending end is obtained.
Step one, four angle parameters theta meeting the transmission condition of the generalized mixed carrier frequency selection channel are selected0、θ1、θ2And theta3The generalized mixed carrier frequency-selective channel transmission conditions are specifically as follows:
The method for calculating the forward transform weighting coefficients of the time domain component and the time domain reversal component of the generalized mixed carrier system in the second step specifically comprises the following steps:
where i is the unit of imaginary number and e is the base of the natural logarithm.
The method for calculating the inverse transformation weighting coefficient of the time domain component and the time domain reversal component of the generalized mixed carrier system in the third step specifically comprises the following steps:
where i is the unit of imaginary number and e is the base of the natural logarithm.
The weighted forward transformation method of the time domain signal and the time domain reversal signal of the generalized mixed carrier system in the step five specifically comprises the following steps:
F(X0)＝ω0X0+ω1X1
in the formula, X0Is an original signal; x1Is X0Inversion of the sequence; f (X)0) Is the result of the forward transform.
The method for inverse weighting of the time domain signal and the time domain reversal signal of the generalized mixed carrier system comprises the following steps:
in the formula, X0Is an original signal; x1Is X0Inversion of the sequence; f-1(X0) Is the result after inverse transformation.
The invention expands the classical mixed carrier system into the generalized mixed carrier system by a new weighting coefficient calculation method. In a generalized mixed carrier system, the invention restrains the frequency domain component of the mixed carrier by limiting parameter selection, and only reserves the time domain component and the time domain reversal component which are suitable for a frequency selection channel, thereby ensuring that the mixed carrier system can also obtain the error code performance which is not weaker than that of a single carrier system in the frequency selection channel.
Drawings
Fig. 1 is a schematic flow chart of a generalized mixed carrier system time domain signal and time domain inverse signal weighted forward transform implementation.
Fig. 2 is a schematic flow chart of an implementation of inverse weighted transform of a time domain signal and a time domain inversion signal of a generalized mixed carrier system.
Detailed Description
In the first embodiment, the generalized mixed carrier frequency-selective channel transmission method according to the first embodiment is described with reference to fig. 1 and fig. 2, and is characterized in that: it comprises the following steps:
step one, selecting four angle parameters theta meeting generalized mixed carrier frequency selection channel transmission conditions0、θ1、θ2And theta3(ii) a Theta is described0,θ1,θ2,θ3∈[0,2π)；
Step two, according to the method for calculating the forward conversion weighting coefficient of the time domain component and the time domain reversal component of the generalized mixed carrier system, the forward conversion weighting coefficient w of the time domain component and the time domain reversal component is calculated by utilizing the four angle parameters selected in the step one0And w1；
Step three, according to the inverse transformation weighting coefficient calculation method of the time domain component and the time domain reversal component of the generalized mixed carrier system, the inverse transformation weighting coefficient of the time domain component and the time domain reversal component is calculated by utilizing the four angle parameters selected in the step one
And
modulating a signal to be transmitted, and dividing the signal into data blocks with the length of N, wherein each data block is called a frame; n is a positive integer;
step five, using the forward transform weighting coefficient calculated in the step two, the transmitting end carries out weighted forward transform on each frame data in the step four according to a generalized mixed carrier system time domain signal and time domain reversal signal weighted forward transform method, and transmits the transformed signal through an antenna;
sixthly, by using the inverse transformation weighting coefficient calculated in the third step, the receiving end carries out inverse weighting transformation on the received data according to the inverse weighting transformation method of the time domain signal and the time domain reversal signal of the generalized mixed carrier system;
and step seven, the receiving end judges the signals subjected to the weighting inverse transformation in the step six, so that the information sent by the sending end is obtained.
Step one, four angle parameters theta meeting the transmission condition of the generalized mixed carrier frequency selection channel are selected0、θ1、θ2And theta3The generalized mixed carrier frequency-selective channel transmission conditions are specifically as follows:
The method for calculating the forward transform weighting coefficients of the time domain component and the time domain reversal component of the generalized mixed carrier system in the second step specifically comprises the following steps:
where i is the unit of imaginary number and e is the base of the natural logarithm.
The method for calculating the inverse transformation weighting coefficient of the time domain component and the time domain reversal component of the generalized mixed carrier system in the third step specifically comprises the following steps:
where i is the unit of imaginary number and e is the base of the natural logarithm.
The weighted forward transformation method of the time domain signal and the time domain reversal signal of the generalized mixed carrier system in the step five specifically comprises the following steps:
F(X0)＝ω0X0+ω1X1
in the formula, X0Is an original signal; x1Is X0Inversion of the sequence; f (X)0) Is the result of the forward transform.
The method for inverse weighting of the time domain signal and the time domain reversal signal of the generalized mixed carrier system comprises the following steps:
in the formula, X0Is an original signal; x1Is X0Inversion of the sequence; f-1(X0) Is the result after inverse transformation.
Claims (1)
1. The generalized mixed carrier frequency-selective channel transmission method is characterized in that: it comprises the following steps:
step one, selecting four angle parameters theta meeting generalized mixed carrier frequency selection channel transmission conditions0、θ1、θ2And theta3(ii) a Theta is described0,θ1,θ2,θ3∈[0,2π)；
The carrier frequency selection channel transmission conditions are specifically as follows:
Step two, according to the method for calculating the forward conversion weighting coefficient of the time domain component and the time domain reversal component of the generalized mixed carrier system, the forward conversion weighting coefficient w of the time domain component and the time domain reversal component is calculated by utilizing the four angle parameters selected in the step one0And w1(ii) a Forward transform weighting factor w0And w1The calculation method specifically comprises the following steps:
wherein i is an imaginary unit and e is the base of the natural logarithm;
step three, according to the inverse transformation weighting coefficient calculation method of the time domain component and the time domain reversal component of the generalized mixed carrier system, the inverse transformation weighting coefficient of the time domain component and the time domain reversal component is calculated by utilizing the four angle parameters selected in the step one
And
the calculation method specifically comprises the following steps:
wherein i is an imaginary unit and e is the base of the natural logarithm;
modulating a signal to be transmitted, and dividing the signal into data blocks with the length of N, wherein each data block is called a frame; n is a positive integer;
step five, using the forward transform weighting coefficient calculated in the step two, the transmitting end carries out weighted forward transform on each frame data in the step four according to a generalized mixed carrier system time domain signal and time domain reversal signal weighted forward transform method, and transmits the transformed signal through an antenna;
sixthly, by using the inverse transformation weighting coefficient calculated in the third step, the receiving end carries out inverse weighting transformation on the received data according to the inverse weighting transformation method of the time domain signal and the time domain reversal signal of the generalized mixed carrier system;
and step seven, the receiving end judges the signals subjected to the weighting inverse transformation in the step six, so that the information sent by the sending end is obtained.
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| CN109450599B (en) * | 2018-11-20 | 2021-01-12 | 沈阳理工大学 | Compatible scanning method for Fourier regeneration transformation of multi-term fractional domain |
| CN110048974B (en) * | 2019-04-24 | 2021-09-10 | 哈尔滨工业大学 | Half code block inversion diversity method of mixed carrier system |
| CN110602005A (en) * | 2019-06-26 | 2019-12-20 | 哈尔滨工业大学 | Method for realizing signal time-frequency domain energy averaging by two time-domain component equipower weighting transformation |
| CN112714090B (en) * | 2020-12-23 | 2022-07-19 | 哈尔滨工业大学 | Transmission method of weighted fractional Fourier transform extended hybrid carrier |
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| CN104836772A (en) * | 2015-06-02 | 2015-08-12 | 哈尔滨工业大学 | Signal transmission and reception method capable of performing combined suppressing on peak-to-average power ratio and out-of-band power based on mixed carrier system |
| CN104994051A (en) * | 2015-06-02 | 2015-10-21 | 哈尔滨工业大学 | IAPR-based linear scaling change signal transmitting and receiving method for improving PA efficiency of hybrid carrier system |
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| EP0828239A2 (en) * | 1996-09-04 | 1998-03-11 | HE HOLDINGS, INC. dba HUGHES ELECTRONICS | High-accuracy, low-distortion time-frequency analysis of signals using rotated-window spectrograms |
| CN104836772A (en) * | 2015-06-02 | 2015-08-12 | 哈尔滨工业大学 | Signal transmission and reception method capable of performing combined suppressing on peak-to-average power ratio and out-of-band power based on mixed carrier system |
| CN104994051A (en) * | 2015-06-02 | 2015-10-21 | 哈尔滨工业大学 | IAPR-based linear scaling change signal transmitting and receiving method for improving PA efficiency of hybrid carrier system |
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