CN114157542B - CE-OFDMA system signal transceiving method based on direct current component separation - Google Patents

CE-OFDMA system signal transceiving method based on direct current component separation Download PDF

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CN114157542B
CN114157542B CN202111432412.9A CN202111432412A CN114157542B CN 114157542 B CN114157542 B CN 114157542B CN 202111432412 A CN202111432412 A CN 202111432412A CN 114157542 B CN114157542 B CN 114157542B
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CN114157542A (en
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顾新杰
但黎琳
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University of Electronic Science and Technology of China
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    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
    • 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
    • H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
    • 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
    • H04L27/2646—Arrangements specific to the transmitter only using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
    • 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
    • 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
    • H04L27/2666—Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length
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    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits
    • H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
    • H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/03433—Arrangements for removing intersymbol interference characterised by equaliser structure
    • H04L2025/03535—Variable structures
    • H04L2025/03541—Switching between domains, e.g. between time and frequency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention belongs to the technical field of wireless communication, and particularly relates to a signal transceiving method of a CE-OFDMA system based on direct-current component separation. The method mainly comprises the steps of placing modulated signals generated after modulation according to a conjugate symmetric format, then mapping, obtaining a transmitting signal after phase modulation, wherein the mapped frequency domain data still needs to meet the conjugate symmetric format. The invention provides a signal receiving and transmitting method based on a direct current component separation CE-OFDMA system, which is applied to an uplink, and a transmitter can solve the problem that the carrier frequency power of each user is gathered at a carrier frequency point to cause the information loss of each user, thereby ensuring the final BER performance of each user.

Description

CE-OFDMA system signal transceiving method based on direct current component separation
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a method for receiving and transmitting signals of a CE-OFDMA (Constant Orthogonal Frequency Division Multiple Access) system based on direct-current component separation.
Background
Orthogonal Frequency Division Multiple Access (OFDMA) is a commonly used Multiple Access technique in wireless digital communication, and can transmit data at a high rate on a severe wireless channel with severe multipath fading. However, the main drawback of OFDMA is that the modulation waveform has high amplitude fluctuations, resulting in a large Peak to Average Power Ratio (PAPR). The high PAPR makes OFDMA very sensitive to nonlinear distortion caused by the transmitter Power Amplifier (PA), and if there is not enough Power back-off, the spectrum of the system will be broadened and thus performance will be degraded, and solving this problem by increasing the Power back-off will reduce PA efficiency. Unlike the downlink, where the transmit power of each user is affected by the total transmit power of the base station and the transmit power of other individual users, the uplink, where the transmit power of each user is affected only by the maximum transmit power of its device. The PA efficiency problem is more severe for uplinks where power consumption is a critical requirement, and efficient amplification can be seen as a key factor for future systems operating in the future ultra-high frequency band.
A constant envelope orthogonal frequency division multiple access (CE-OFDMA) system transmit side baseband signal has a constant envelope characteristic with a lowest PAPR =0dB, so that the signal can be transmitted through a saturated amplifier without amplitude distortion and spectral regeneration. In addition, compared with the OFDM signal, CE-OFDM generates correlation among subcarriers through phase modulation, can obtain certain diversity gain of multipath fading, and generates better error rate performance when the modulation index is greater than 1. However, compared to OFDMA, there is interference in subcarriers between CE-OFDMA users, and the dc components of all users are completely superimposed at the receiving end, which brings a new problem to multi-user detection.
The existing CE-OFDMA system is basically designed for downlink multi-user and mainly adopts multi-user joint detection.
Disclosure of Invention
The invention provides a signal receiving and transmitting method based on direct current component separation aiming at a CE-OFDMA system of an uplink, solves the problem that direct current components of each user of the CE-OFDMA are gathered at a carrier frequency point to cause user information loss, and improves the error rate performance of the system.
The technical scheme of the invention is as follows:
a CE-OFDMA uplink signal transceiving method based on direct current component separation sets the number of users to be U, the modulation index to be 2 pi h, the digital modulation mode to be M-QAM, and the cyclic prefix length to be N in the CE-OFDMA system CP Total number of subcarriers is N DFT The number of subcarriers of each user is N i ＝N DFT U, then each user can transmit digital modulation as N QAM ＝(N DFT U-2)/2, where i =1, 2.
The system comprises:
transmitting end, as shown in fig. 1:
s1, modulation and mapping:
ith user bit data b i (n),n＝1,2,...,N QAM log 2 M generates a modulation signal X after being modulated by M-QAM i [k],k＝1,2,...,N QAM Then placed according to the following conjugate symmetry format:
X i [k]＝[0,X[1],X[2],…,X[N QAM ],0,X * [N QAM ],…,X * [2],X * [1]]
then sub-carrier mapping is carried out on the modulated data; then through N DFT IFFT transformation of point length is carried out, and time domain signals are generated after parallel/serial transformation:
Figure BDA0003380575930000021
wherein
Figure BDA0003380575930000022
Is a normalization factor;
s2, phase modulation:
multiplying the time domain signal by the modulation index 2 pi h for modulation, and generating a phase modulation signal s of the user i through phase modulation i ：
s i (n)＝Aexp[j2πhx i (t)]
Where A is the amplitude parameter of the CE-OFDM signal. Finally, inserting the phase modulation signal into a protection prefix to obtain:
s CP_i (n)＝[s i (N DFT -N CP ),s i (N DFT -N CP +1),...,s i (N DFT -1),s i (0),s i (1),...,s i (N DFT -1)]
then the signal s CP_i And (n) sending.
Receiving end, as shown in fig. 2:
s3, setting time domain receiving signal y CP (n) is:
y CP (n)＝[y CP (0),y CP (1),...,y CP (N DFT +N CP -1)]
removing cyclic prefix and serial-to-parallel conversion to obtain y (n):
y(n)＝[y(0),y(1),...,y(N DFT -1)]
s4, channel equalization:
and the signal is changed into a frequency domain signal Y through an FFT module:
Figure BDA0003380575930000031
and then carrying out channel equalization on the signals, wherein the equalization method is zero-forcing equalization or minimum mean square error equalization. The equalized signal is represented as
Figure BDA0003380575930000032
S5, multi-user signal separation:
separating user signals according to sub-carrier mapping position
Figure BDA0003380575930000033
Converting the frequency domain signal into a time domain signal through an IFFT module to obtain a time domain signal->
Figure BDA0003380575930000034
Calculating user signals
Figure BDA0003380575930000035
Is greater than or equal to>
Figure BDA0003380575930000036
Figure BDA0003380575930000037
Calculating a power change factor λ:
Figure BDA0003380575930000038
according to
Figure BDA0003380575930000039
And lambda, calculating the DC component C of each user i ：
Figure BDA00033805759300000310
Updating the time domain signal according to the direct current component:
Figure BDA0003380575930000041
s6, phase demodulation:
the time domain updating signal passes through a phase demodulator to obtain phase information:
Figure BDA0003380575930000042
wherein
Figure BDA0003380575930000043
And &>
Figure BDA0003380575930000044
Are respectively>
Figure BDA0003380575930000045
The real and imaginary components of (a).
S7, acquiring transmission bits:
the signal after phase demodulation is processed by an FFT module to obtain a frequency domain signal
Figure BDA0003380575930000046
And finally, carrying out M-QAM demodulation on the data subjected to digital modulation to obtain bit data transmitted by each user.
The invention has the beneficial effects that the signal receiving and transmitting method based on the direct current component separation CE-OFDMA system applied to the uplink is provided, and the transmitter can solve the problem that the carrier frequency power of each user is gathered at the carrier frequency point to cause the information loss of each user, thereby ensuring the final BER performance of each user.
Drawings
Fig. 1 is a block diagram of a transmitting end of an uplink CE-OFDMA system.
Fig. 2 is a block diagram of a receiving end of an uplink CE-OFDMA system.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples.
Examples
In this example, the number of users is U =2, and the modulation index is 2 pi h =0.5, the digital modulation mode is QPSK (4-QAM), the length of the cyclic prefix is N CP =3, total number of subcarriers N DFT =64, number of subcarriers per user N 1 ＝N 2 =32, the number of digital modulation symbols transmittable by each user is N QAM =15, the channel parameter is EVA channel, MMSE equalization is adopted, ideal channel estimation is taken as an example.
A transmitting end:
step 1-1: determining parameters of a system to be selected, namely determining the number of users as U =2, the modulation index as 2 pi h =0.5, the digital modulation mode as QPSK, the total number of subcarriers as N DFT =64, number of subcarriers per user N 1 ＝N 2 =32, then each user can transmit digital modulation symbol with number of N QAM =15, signal amplitude parameter a =1. And then calculating the bit number required to be transmitted by each user according to a formula.
Step 1-2: and (4) OFDM modulation. Firstly, QPSK modulation is carried out on bit information of two users, and then the bit information is mapped to corresponding subcarrier positions according to a conjugate symmetric format and a centralized distribution mode:
user 1: x 1 [k]＝[0,X 1 [1],X 1 [2]…,X 1 [15],0 1×32 ,0,X 1 * [15],…,X 1 * [1]],k＝1,2,...,64
And (4) a user 2: x 2 [k]＝[0 1×16 ,X 2 [1],X 2 [2]…,X 2 [15],0,X 2 * [15],…,X 2 * [2],X 2 * [1],0 1×16 ],k＝1,2,...,64
Then, after IFFT conversion with the length of 64 points, generating a time domain signal after parallel/serial conversion:
Figure BDA0003380575930000051
wherein
Figure BDA0003380575930000052
Step 1-3: and (4) phase modulation. Multiplying a time domain signal byModulation index 2 pi h =0.5 modulation, and generating phase modulation signal s of user i through phase modulation i Assume that user 1 and user 2 are transmitting at equal power:
Figure BDA0003380575930000053
finally, inserting the phase modulation signal into a protection prefix to obtain:
s CP_i (n)＝[s i (61),s i (62),s i (63),s i (0),s i (1),...,s i (63)]
then the signal s CP_i And (n) sending.
Receiving end:
step 2-1: time domain setting of received signal y CP (n) is:
y CP (n)＝[y CP (0),y CP (1),...,y CP (N DFT +N CP -1)]
step 2-2: and (4) channel equalization. Removing cyclic prefix and serial-to-parallel conversion to obtain y (n):
y(n)＝[y(0),y(1),...,y(N DFT -1)]
and the signal is changed into a frequency domain signal Y through an FFT module:
Figure BDA0003380575930000061
then estimating the obtained channel parameters according to the ideal channel
Figure BDA0003380575930000062
Figure BDA0003380575930000063
And then carrying out channel equalization on the signals, wherein the equalization method is zero-breaking equalization. The equalized signal is represented as
Figure BDA0003380575930000064
Figure BDA0003380575930000065
Wherein { } H Is a conjugate symmetric transpose transform.
Step 2-3: and (4) separating multi-user signals. Separating user signals according to sub-carrier mapping position
Figure BDA0003380575930000066
User 1:
Figure BDA0003380575930000067
and (4) a user 2:
Figure BDA0003380575930000068
then, the frequency domain signal is converted into a time domain through an IFFT module to obtain a time domain signal
Figure BDA0003380575930000069
/>
Calculating user signals
Figure BDA00033805759300000610
Is greater than or equal to>
Figure BDA00033805759300000611
P 1 ＝P 2 ＝1
Calculating a power change factor λ:
λ＝1.77
according to
Figure BDA00033805759300000612
And lambda, calculating the DC component C of each user i ：
C 1 ＝C 2 ＝0.885e -1/8
Updating the time domain signal according to the DC component:
Figure BDA0003380575930000071
Figure BDA0003380575930000072
step 4-1: and (4) phase demodulation. The time domain updating signal passes through a phase demodulator to obtain phase information:
Figure BDA0003380575930000073
Figure BDA0003380575930000074
wherein
Figure BDA0003380575930000075
And &>
Figure BDA0003380575930000076
Are respectively>
Figure BDA0003380575930000077
Is in plural form->
Figure BDA0003380575930000078
The real and imaginary components of (a).
Step 4-2: the transmission bits are obtained. The signal after phase demodulation is processed by an FFT module to obtain a frequency domain signal
Figure BDA0003380575930000079
And
Figure BDA00033805759300000710
and finally, carrying out M-QAM demodulation on the data subjected to digital modulation to obtain bit data sent by each user.
The invention provides a signal transceiving method based on a direct current component separation CE-OFDMA system, which is applied to an uplink, and is applied to the uplink according to the advantage of 0dB PAPR of a CE-OFDM signal baseband, and a transmitter can solve the problem that the carrier frequency power of each user is gathered at a carrier frequency point to cause the loss of information of each user, thereby ensuring the final BER performance of each user.

Claims (1)

1. A CE-OFDMA system signal transceiving method based on direct current component separation is disclosed, in the CE-OFDMA system, the number of users is U, the modulation index is 2 pi h, the digital modulation mode is M-QAM, the length of cyclic prefix is N CP Total number of subcarriers is N DFT The number of subcarriers of each user is N i ＝N DFT U, then each user can transmit digital modulation order of N QAM ＝(N DFT U-2)/2, where i =1, 2.., U, representing the ith user; it is characterized by comprising the following steps:
s1, modulation and mapping:
ith user bit data b i (n),n＝1,2,...,N QAM log 2 M generates a modulation signal X after being modulated by M-QAM i [k],k＝1,2,...,N QAM M is the modulation order, and then placed according to the following conjugate symmetry format:
X i [k]＝[0,X[1],X[2],…,X[N QAM ],0,X * [N QAM ],…,X * [2],X * [1]]
then sub-carrier mapping is carried out on the modulated data; then through N DFT IFFT transformation of point length is carried out, and time domain signals are generated after parallel/serial transformation:
Figure FDA0004073313800000011
wherein
Figure FDA0004073313800000012
Is a normalization factor;
s2, phase modulation:
multiplying the time domain signal obtained in the step S1 by a modulation index 2 pi h, and generating a phase modulation signal S of the user i through phase modulation i ：
s i (n)＝Aexp[j2πhx i (t)]
Wherein A is an amplitude parameter of the CE-OFDM signal; inserting the phase modulation signal into the cyclic prefix to obtain a transmitting signal:
s CP_i (n)＝[s i (N DFT -N CP ),s i (N DFT -N CP +1),...,s i (N DFT -1),s i (0),s i (1),...,s i (N DFT -1)]
then will transmit signal s CP_i (n) transmitting;
s3, setting time domain receiving signal y CP (n) is:
y CP (n)＝[y CP (0),y CP (1),...,y CP (N DFT +N CP -1)]
removing cyclic prefix and serial-to-parallel conversion to obtain y (n):
y(n)＝[y(0),y(1),...,y(N DFT -1)]
s4, channel equalization:
and changing Y (n) into a frequency domain signal Y through an FFT module:
Figure FDA0004073313800000021
then, the signal is subjected to channel equalization, and the equalized signal is represented as
Figure FDA0004073313800000022
S5, multi-user signal separation:
separating user signals according to sub-carrier mapping position
Figure FDA0004073313800000023
Converting the frequency domain signal into a time domain signal through an IFFT module to obtain a time domain signal->
Figure FDA0004073313800000024
Calculating user signals
Figure FDA0004073313800000025
Is greater than or equal to>
Figure FDA0004073313800000026
Figure FDA0004073313800000027
Calculating a power change factor λ:
Figure FDA0004073313800000028
according to
Figure FDA0004073313800000029
And lambda, calculating the DC component C of each user i ：
Figure FDA00040733138000000210
Updating the time domain signal according to the direct current component:
Figure FDA0004073313800000031
s6, phase demodulation:
the time domain updating signal passes through a phase demodulator to obtain phase information:
Figure FDA0004073313800000032
wherein
Figure FDA0004073313800000033
And &>
Figure FDA0004073313800000034
Are respectively>
Figure FDA0004073313800000035
The real and imaginary components of (a);
s7, acquiring transmission bits:
the signal after phase demodulation is processed by FFT to obtain a frequency domain signal
Figure FDA0004073313800000036
And finally, carrying out M-QAM demodulation on the data subjected to digital modulation to obtain bit data sent by each user. />
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CN107181706A (en) * 2017-05-31 2017-09-19 北京邮电大学 Offset estimation based on leading symbol and compensation method in a kind of permanent envelope ofdm system
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