CN109257315B - General filtering multi-carrier system based on non-orthogonal multiple access - Google Patents

General filtering multi-carrier system based on non-orthogonal multiple access Download PDF

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CN109257315B
CN109257315B CN201811235249.5A CN201811235249A CN109257315B CN 109257315 B CN109257315 B CN 109257315B CN 201811235249 A CN201811235249 A CN 201811235249A CN 109257315 B CN109257315 B CN 109257315B
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CN109257315A (en
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张明轩
缪巍巍
丁正阳
曾锃
张厦千
唐灏
党建
吴梦婷
吴亮
张在琛
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Southeast University
Information and Telecommunication Branch of State Grid Jiangsu Electric Power Co Ltd
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Information and Telecommunication Branch of State Grid Jiangsu Electric Power Co Ltd
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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
    • 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
    • H04L27/2647—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 general filtering multi-carrier system based on non-orthogonal multiple access, which comprises a transmitter and a receiver. At a transmitting end, each user simultaneously occupies two sub-bands for information transmission, namely, signals of the two users are simultaneously transmitted on the same sub-band; at a receiving end, the frequency domain receiving signals of all users are equalized simultaneously through a parallel interference elimination technology so as to recover original data information sent by all users. Compared with the conventional general filtering multi-carrier system, the invention can fully realize the frequency diversity gain of the channel bandwidth and has the advantages of excellent performance, low time delay and the like.

Description

General filtering multi-carrier system based on non-orthogonal multiple access
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a general filtering multi-carrier system based on non-orthogonal multiple access.
Background
In an energy internet, a large-scale sensor network needs to support ubiquitous acquisition and transmission tasks, and a new electric power service and transaction platform needs better network quality assurance. How to meet the requirements of various power services on higher bandwidth, extremely low delay and ubiquitous connection is an urgent problem to be solved.
As an effective implementation form in the new waveform technology, a Universal Filtered Multi-Carrier (UFMC) technology performs subband filtering on a group of continuous subcarriers, which is a popularization of an Orthogonal Frequency Division Multiplexing (OFDM) technology and a Filter Bank Multi-Carrier (FBMC) technology, and is expected to replace OFDM to become a candidate waveform of a physical layer of a future communication system. Compared with the OFDM, because the UFMC system introduces additional subband filtering, the spectral efficiency of the system can be increased by removing Cyclic Prefix (CP), and the delay is reduced. In addition, by designing the Chebyshev filter with excellent performance, the UFMC can effectively reduce sidelobe leakage of out-of-band frequency spectrum and improve the robustness of the system against inter-carrier interference. In addition, compared with the FBMC, the UFMC scheme can effectively reduce the length of the filter, making it suitable for short-distance burst communication.
The future energy Internet has the capability of acquiring, transmitting and processing large-scale, distributed and multi-type service data, and the existing power wireless private network cannot fully meet the service scene requirements of power service broadband and narrowband coexistence, massive terminal access, high reliability, low time delay, low power consumption and the like. Therefore, how to design a new waveform scheme meeting the requirements of future delay sensitive service and high-performance multi-user signal detection of the power wireless private network by using the design idea of a general filtering multi-carrier scheme and combining the inherent characteristics of power service data has important economic significance and scientific research value, and simultaneously faces a plurality of technical challenges and urgently needs to be overcome.
Disclosure of Invention
In order to solve the technical problems in the background art, the present invention aims to provide a general filtering multi-carrier system based on non-orthogonal multiple access, which reduces the time delay and improves the detection performance of the existing new waveform transmission scheme.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
a general filtering multi-carrier system based on non-orthogonal multiple access comprises a transmitter and a receiver, wherein at a transmitting end, each user simultaneously occupies two sub-bands for information transmission, namely, signals of the two users are simultaneously transmitted on the same sub-band; at a receiving end, the frequency domain receiving signals of all users are equalized simultaneously through a parallel interference elimination technology so as to recover original data information sent by all users.
Further, at the transmitting end, two subband indexes occupied by user i are represented as i and j:
Figure BDA0001838042800000021
where m represents the number of subbands, the transmitted signal x for user iiExpressed as:
Figure BDA0001838042800000022
where α represents the ratio of the transmission power allocated to the ith subband by user i, 1- α represents the ratio of the transmission power allocated to the jth subband by user i, and SiA column vector, F, formed by the transmitted signals representing the users ii、FjToeplitz matrix V composed of coefficients of the low-pass filters in the ith and jth sub-bandsi、VjRespectively representing IDFT matrixes on the ith sub-band and the jth sub-band, namely the corresponding columns of sub-carrier indexes contained in the ith sub-band in an N-point IDFT matrix, N is the total number of sub-carriers,
Figure BDA0001838042800000023
Niis the number of sub-carriers contained in the ith sub-band.
Further, at the receiving end, the DFT operation is performed on the time domain received signals of all users to obtain frequency domain received signals:
Figure BDA0001838042800000031
wherein Y is a frequency domain received signal, Y is a time domain received signal, and W represents the first N + L in the 2N-point DFT matrixf+Lh-2 columns, wherein LfRepresenting the length, L, of the subband filterhIndicating the length of the multipath channel, HiThe Toeplitz matrix formed by the channel coefficients of the ith user is expressed, H is formed by connecting the channel matrixes of all the users in series, namely H ═ H1H2...Hm]，Fa、Fb、Va、VbEach representing a block diagonal matrix, i.e.
Figure BDA0001838042800000032
Figure BDA0001838042800000033
S is formed by the parallel connection of the transmitted signals of all users, i.e.
Figure BDA0001838042800000034
Further, at the receiving end, after obtaining the frequency domain received signal, the initial pre-equalization is performed through the multi-user detection technology, and then the initially detected data is simultaneously fed back to the interference cancellers of all users for secondary equalization, that is, for a certain user, the detected signals of other users are simultaneously reconstructed and cancelled, and then single-user demodulation is respectively performed, so as to realize the secondary estimation of the signals of all users, and by taking the secondary estimation as a cycle, the accurate estimation of the transmitted signals of all users is finally obtained.
Further, the demodulation step at the receiving end is as follows:
(1) setting a maximum iteration time T, and enabling the iteration time T to be 0;
(2) initial pre-equalization, MMSE estimation is performed on the transmit signals S of all users:
Figure BDA0001838042800000041
where the superscript H denotes the conjugate transpose, σ2Representing the variance of the noise, INRepresenting an N-order identity matrix;
(3) for the obtained estimated signal
Figure BDA0001838042800000042
QPSK demodulation is carried out, and then QPSK modulation is carried out to obtain
Figure BDA0001838042800000043
(4) For the k user, the frequency domain received signal Y after parallel interference eliminationkComprises the following steps:
Figure BDA0001838042800000044
wherein the content of the first and second substances,
Figure BDA0001838042800000045
to represent
Figure BDA0001838042800000046
The signal is sent to the ith user;
(5) estimation of new transmitted signal for kth user
Figure BDA0001838042800000047
Comprises the following steps:
Figure BDA0001838042800000048
wherein the content of the first and second substances,
Figure BDA0001838042800000049
(6) estimating new transmission signals of all users
Figure BDA00018380428000000410
Are combined into a new
Figure BDA00018380428000000411
Let t be t + 1;
(7) and (5) repeating the steps (3) to (6) until T reaches the maximum iteration number T.
Adopt the beneficial effect that above-mentioned technical scheme brought:
(1) the invention simultaneously sends the data information of different users on the same sub-band, and can fully utilize the frequency diversity gain of the channel bandwidth, thereby improving the transmission performance of the system;
(2) in the technical scheme of the invention, the receiving end simultaneously carries out equalization processing on the frequency domain receiving signals of all users by means of a parallel interference elimination technology, and finally recovers the original data information sent by all users, thereby effectively reducing the processing time delay of the system and improving the detection performance of the system while sacrificing the complexity of the system.
Drawings
FIG. 1 is a system flow diagram of the present invention;
fig. 2 is a simulation comparison graph of the change of the symbol error rate curve with the signal-to-noise ratio of the system of the present invention and the existing UFMC system in the embodiment.
Detailed Description
The technical scheme of the invention is explained in detail in the following with the accompanying drawings.
The invention designs a general filtering multi-carrier system based on non-orthogonal multiple access, and the working process of the general filtering multi-carrier system is shown in figure 1. At a transmitting end, each user simultaneously occupies two sub-bands for information transmission, namely, signals of the two users are simultaneously transmitted on the same sub-band; at a receiving end, the frequency domain receiving signals of all users are equalized simultaneously through a parallel interference elimination technology so as to recover original data information sent by all users.
Preferably, at the transmitting end, the two subband indexes occupied by user i are represented as i and j:
Figure BDA0001838042800000051
where m represents the number of subbands, the transmitted signal x for user iiExpressed as:
Figure BDA0001838042800000052
where α represents the ratio of the transmission power allocated to the ith subband by user i, 1- α represents the ratio of the transmission power allocated to the jth subband by user i, and SiA column vector, F, formed by the transmitted signals representing the users ii、FjToeplitz matrix V composed of coefficients of the low-pass filters in the ith and jth sub-bandsi、VjRespectively representing IDFT matrixes on the ith sub-band and the jth sub-band, namely the corresponding columns of sub-carrier indexes contained in the ith sub-band in an N-point IDFT matrix, N is the total number of sub-carriers,
Figure BDA0001838042800000053
Niis the number of sub-carriers contained in the ith sub-band.
Preferably, at the receiving end, the DFT operation is performed on the time domain received signals of all users to obtain frequency domain received signals:
Figure BDA0001838042800000061
wherein Y is a frequency domain received signal, Y is a time domain received signal, and W represents the first N + L in the 2N-point DFT matrixf+Lh-2 columns (wherein, LfRepresenting the length, L, of the subband filterhRepresenting the length of the multipath channel), HiThe Toeplitz matrix formed by the channel coefficients of the ith user is expressed, H is formed by connecting the channel matrixes of all the users in series, namely H ═ H1H2...Hm]，Fa、Fb、Va、VbEach representing a block diagonal matrix, i.e.
Figure BDA0001838042800000062
Figure BDA0001838042800000063
S is formed by the parallel connection of the transmitted signals of all users, i.e.
Figure BDA0001838042800000064
At a receiving end, after a frequency domain receiving signal is obtained, initial pre-equalization is carried out through a multi-user detection technology, then initially detected data are simultaneously fed back to interference cancellers of all users for secondary equalization, namely, for a certain user, detection signals of other users are simultaneously reconstructed and eliminated, single-user demodulation is respectively carried out, so that secondary estimation of signals of all users is realized, and accurate estimation of sending signals of all users is finally obtained by taking the secondary estimation as circulation.
The demodulation steps at the receiving end are as follows:
(1) setting a maximum iteration time T, and enabling the iteration time T to be 0;
(2) initial pre-equalization, MMSE estimation is performed on the transmit signals S of all users:
Figure BDA0001838042800000071
where the superscript H denotes the conjugate transpose, σ2Representing the variance of the noise, INRepresenting an N-order identity matrix;
(3) for the obtained estimated signal
Figure BDA0001838042800000072
QPSK demodulation is carried out, and then QPSK modulation is carried out to obtain
Figure BDA0001838042800000073
(4) For the k user, the frequency domain received signal Y after parallel interference eliminationkComprises the following steps:
Figure BDA0001838042800000074
wherein the content of the first and second substances,
Figure BDA0001838042800000075
to represent
Figure BDA0001838042800000076
The signal is sent to the ith user;
(5) estimation of new transmitted signal for kth user
Figure BDA0001838042800000077
Comprises the following steps:
Figure BDA0001838042800000078
wherein the content of the first and second substances,
Figure BDA0001838042800000079
(6) estimating new transmission signals of all users
Figure BDA00018380428000000710
Are combined into a new
Figure BDA00018380428000000711
Let t be t + 1;
(7) and (5) repeating the steps (3) to (6) until T reaches the maximum iteration number T.
Example 1:
assume that the channel used in this embodiment is a 6-tap normalized rayleigh fading channel. For the sake of fairness comparison, the modulation modes of the UFMC system and the general filtering multi-carrier system based on non-orthogonal multiple access provided by the present invention are all Quadrature Phase Shift Keying (QPSK), the number of subcarriers is N ═ 128, the number of users is 8, and the subband filters all use Dolph-Chebyshev filters with length of 16 and sidelobe attenuation of 22 dB.
Fig. 2 is a simulation curve comparing the Symbol Error Rate (SER, Symbol Error Rate) of the generic filtering multi-carrier system based on non-orthogonal multiple access and the conventional UFMC system in the above embodiment 1 with the Signal-to-Noise Ratio (SNR). In this embodiment, the snr is defined as the ratio of the average received signal power and the noise power at the receiving end. In this embodiment, each user simultaneously occupies two subbands for information transmission (i.e., user 1 occupies subbands 1 and 5, user 2 occupies subbands 2 and 6, user 3 occupies subbands 3 and 7, user 4 occupies subbands 4 and 8, and user 5 occupies subbands 5 and 1, etc.), and the power ratio allocated to user i on subbands i and j is α:1- α. The results in fig. 2 show that by allocating appropriate transmit power (α ═ 0.8, 0.9) to users on different sub-bands at the transmitting end, the SER performance of the system proposed by the present invention is superior to that of the existing UFMC system, and this advantage is that the system proposed by the present invention introduces the non-orthogonal idea, and further utilizes the frequency diversity gain of the channel bandwidth, thereby improving the system performance.
The embodiments are only for illustrating the technical idea of the present invention, and the technical idea of the present invention is not limited thereto, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the scope of the present invention.

Claims (3)

1. A general filtering multi-carrier system based on non-orthogonal multiple access, comprising a transmitter and a receiver, characterized in that: at a transmitting end, each user simultaneously occupies two sub-bands for information transmission, and two sub-band indexes occupied by a user i are represented as i and j:
Figure FDA0002852012950000011
where m represents the number of subbands, the transmitted signal x for user iiExpressed as:
Figure FDA0002852012950000012
where α represents the ratio of the transmission power allocated to the ith subband by user i, 1- α represents the ratio of the transmission power allocated to the jth subband by user i, and SiA column vector, F, formed by the transmitted signals representing the users ii、FjToeplitz matrix V composed of coefficients of the low-pass filters in the ith and jth sub-bandsi、VjRespectively representing IDFT matrixes on the ith sub-band and the jth sub-band, namely the corresponding columns of sub-carrier indexes contained in the ith sub-band in an N-point IDFT matrix, N is the total number of sub-carriers,
Figure FDA0002852012950000013
Nithe number of sub-carriers included in the ith sub-band;
at a receiving end, after a frequency domain receiving signal is obtained, initial pre-equalization is carried out through a multi-user detection technology, then initially detected data are simultaneously fed back to interference cancellers of all users for secondary equalization, namely, for a certain user, detection signals of other users are simultaneously reconstructed and eliminated, single-user demodulation is respectively carried out, so that secondary estimation of signals of all users is realized, and accurate estimation of sending signals of all users is finally obtained by taking the secondary estimation as circulation.
2. The non-orthogonal multiple access based filtered generic multi-carrier system of claim 1, wherein: at a receiving end, firstly, performing DFT operation on time domain received signals of all users to obtain frequency domain received signals:
Figure FDA0002852012950000021
wherein Y is a frequency domain received signal, Y is a time domain received signal, and W represents the first N + L in the 2N-point DFT matrixf+Lh-2 columns, wherein LfRepresenting the length, L, of the subband filterhIndicating the length of the multipath channel, HiIs shown asThe Toeplitz matrix formed by the channel coefficients of i users, H is formed by connecting the channel matrixes of all users in series, i.e. H ═ H1 H2...Hm]，Fa、Fb、Va、VbEach representing a block diagonal matrix, i.e.
Figure FDA0002852012950000022
Figure FDA0002852012950000023
S is formed by the parallel connection of the transmitted signals of all users, i.e.
Figure FDA0002852012950000024
3. The non-orthogonal multiple access based filtered generic multi-carrier system of claim 2, wherein: the demodulation steps at the receiving end are as follows:
(1) setting a maximum iteration time T, and enabling the iteration time T to be 0;
(2) initial pre-equalization, MMSE estimation is performed on the transmit signals S of all users:
Figure FDA0002852012950000025
where the superscript H denotes the conjugate transpose, σ2Representing the variance of the noise, INRepresenting an N-order identity matrix;
(3) for the obtained estimated signal
Figure FDA0002852012950000026
QPSK demodulation is carried out, and then QPSK modulation is carried out to obtain
Figure FDA0002852012950000027
(4) For the k user, the frequency domain received signal Y after parallel interference eliminationkComprises the following steps:
Figure FDA0002852012950000031
wherein the content of the first and second substances,
Figure FDA0002852012950000032
to represent
Figure FDA0002852012950000033
The signal is sent to the ith user;
(5) estimation of new transmitted signal for kth user
Figure FDA0002852012950000034
Comprises the following steps:
Figure FDA0002852012950000035
wherein the content of the first and second substances,
Figure FDA0002852012950000036
(6) estimating new transmission signals of all users
Figure FDA0002852012950000037
Are combined into a new
Figure FDA0002852012950000038
Let t be t + 1;
(7) and (5) repeating the steps (3) to (6) until T reaches the maximum iteration number T.
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