CN111064684A - Uplink spatial modulation single carrier frequency domain joint equalization method - Google Patents

Uplink spatial modulation single carrier frequency domain joint equalization method Download PDF

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CN111064684A
CN111064684A CN201911422425.0A CN201911422425A CN111064684A CN 111064684 A CN111064684 A CN 111064684A CN 201911422425 A CN201911422425 A CN 201911422425A CN 111064684 A CN111064684 A CN 111064684A
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于启月
张翼鹏
孟维晓
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Harbin Institute of Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/361—Modulation using a single or unspecified number of carriers, e.g. with separate stages of phase and amplitude modulation
    • 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
    • H04L25/03891—Spatial equalizers

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Abstract

The invention discloses a single carrier frequency domain combined equalization method for uplink space modulation, belongs to the technical field of communication signal detection, and aims to solve the problem that the existing space modulation technology has limitation at a receiver end. The transmitter user adopts a space modulation method to add the information to be transmitted into the cyclic prefix and then passes through NTOne of the root antennas transmits; information on different antennas is sent to a receiver user through different frequency selective fading channels; the receiver user performs fast Fourier transform on the received information and performs N in the frequency domainRJoint equalization of root antennas; and the receiver user adopts inverse fast Fourier transform to carry out maximum likelihood detection, thereby realizing the joint equalization process. The invention is used for spatial modulation of the uplink.

Description

Uplink spatial modulation single carrier frequency domain joint equalization method
Technical Field
The invention relates to a spatial modulation single carrier frequency domain joint equalization method for an uplink, belonging to the technical field of communication signal detection.
Background
The spatial modulation is a novel modulation technology, and fully utilizes the channel state information contained in different antenna resources to transmit information, so that compared with the traditional modulation technology, the channel capacity of the system is increased.
At present, most of the research on spatial modulation systems is performed in a flat fading channel, and in a Frequency selective fading channel, spatial modulation and an OFDM (Orthogonal Frequency division multiplexing) technology are mostly combined, but in an actual communication process, the OFDM modulation technology is difficult to synchronize and only suitable for downlink information transmission, and most of the combination of the spatial modulation and the OFDM technology is simply cascaded at a system level, and a joint design is not performed at a receiver end.
Disclosure of Invention
The invention aims to solve the problem that the existing spatial modulation technology has limitation at a receiver end, and provides an uplink spatial modulation single carrier frequency domain joint equalization method.
The invention relates to an uplink space modulation single carrier frequency domain joint equalization method, wherein a transmitter user of the joint equalization method comprises NTRoot antenna, receiver user NRRoot antenna, NR＝NTThe specific process comprises the following steps:
s1, the transmitter user adds the information to be transmitted into the cyclic prefix by adopting the space modulation method and then passes through NTOne of the root antennas transmits;
s2, the information on different antennas is sent to the user of the receiver through different frequency selective fading channels;
s3, the receiver user carries out fast Fourier transform to the received information and carries out N in the frequency domainRJoint equalization of root antennas;
and S4, carrying out maximum likelihood detection on the result obtained in S3 by the user of the receiver through inverse fast Fourier transform, and realizing a joint equalization process.
Preferably, S1 the transmitter user adds the cyclic prefix to the information to be transmitted and then passes through N by using a spatial modulation methodTThe specific method for transmitting by one of the root antennas is as follows:
s1-1, wherein the data sequence of the information to be transmitted is { xn}, data sequence { xnN is more than or equal to 0 and less than or equal to N-1, and N is more than or equal to L; the L represents the length of the cyclic prefix CP,
Figure BDA0002348570330000025
indicating the number of resolvable paths of the information received by the receiver; k is a radical ofTThe antenna representing the information transmitted by the user of the transmitter is the kth antennaTRoot antenna, kT＝1,2,…,NT；
Data sequence u with cyclic prefix CP addedmSatisfy:
um＝x(N-L+m)mod(N),0≤m≤N+L-1；
s1-2, data sequence { umPerforming spatial modulation to obtain modulated information V:
Figure BDA0002348570330000021
v is to bemTransmitting through an antenna:
Figure BDA0002348570330000022
preferably, the receiver user performs fast fourier transform on the received information and performs N in the frequency domain in S3RThe specific method of the root antenna joint equalization is as follows:
s2-1, the information r received by the receiver user is:
Figure BDA0002348570330000023
wherein V (: k) represents the k column vector of V,
nkis a Gaussian white noise vector of (N + L-1) x 1,
Figure BDA0002348570330000026
Figure BDA0002348570330000024
the matrix of the frequency selective fading channel is:
Figure BDA0002348570330000031
Figure BDA0002348570330000032
for the kth user from the transmitterTK-th arrival of a root antenna at a receiver userRThe multi-path channel gain coefficient vector of the root antenna has the length of L +1,
Figure BDA0002348570330000033
for the kth user from the transmitterTK-th arrival of a root antenna at a receiver userRChannel gain coefficients on the nth resolvable path among the multipath channel gains of the root antenna,
kRthe antenna indicating the reception of information by the user of the receiver is the kth antennaRRoot antenna, kR＝1,2,…,NR；
S2-2, receiving the signal r with the length of N + L by the user of the receiverkDo the cyclic prefix removal processing, i.e. delete { rmGet the first L data of N length sequence y to be equalizedkTo y forkIs obtained by fast Fourier transform
Figure BDA0002348570330000034
By
Figure BDA0002348570330000035
Forming a new received vector yFFT：
Figure BDA0002348570330000036
S2-3, k is more than or equal to any 1R≤NR,1≤kT≤NT，
Figure BDA0002348570330000037
Is obtained by fast Fourier transform
Figure BDA0002348570330000038
Forming a frequency domain channel state information matrix HFFT：
Figure BDA0002348570330000039
S2-4, using frequency domain channel state information matrix HFFTFor yFFTPerforming multi-antenna combined frequency domain equalization:
Figure BDA00023485703300000310
when zero-forcing equalization is used, W ═ HFFT)-1，
When the minimum mean square error technique is employed,
Figure BDA0002348570330000041
wherein N is0Is the noise single-side power spectral density, and I is the unit matrix.
Preferably, the specific method for performing maximum likelihood detection on the result obtained in S3 by the receiver user using inverse fast fourier transform in S4 is as follows: for vector
Figure BDA0002348570330000042
Each element of (a) is subjected to maximum likelihood detection to obtain an output:
Figure BDA0002348570330000043
the invention has the advantages that: the uplink spatial modulation single carrier frequency domain joint equalization method provided by the invention combines an uplink frequency selective channel (SM) system with a single carrier frequency domain equalization technology by establishing an SM system model, and provides a joint SM-SC-FDE equalization technology. The single carrier frequency domain equalization technology is adopted, the difficulty of uplink synchronous receiving is reduced, and meanwhile, the receiver adopts a joint demodulation algorithm, so that the complexity of the receiver is reduced while the performance of a spatial modulation system under a frequency selective fading channel is improved.
Drawings
Fig. 1 is a schematic block diagram of a method for uplink spatial modulation single carrier frequency domain joint equalization according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
The first embodiment is as follows: the following describes the present embodiment with reference to fig. 1, and the transmitter user of the present embodiment includes NTRoot antenna, receiver user NRRoot antenna, NR＝NTThe specific process comprises the following steps:
s1, the transmitter user adds the information to be transmitted into the cyclic prefix by adopting the space modulation method and then passes through NTOne of the root antennas transmits;
s2, the information on different antennas is sent to the user of the receiver through different frequency selective fading channels;
s3, the receiver user carries out fast Fourier transform to the received information and carries out N in the frequency domainRJoint equalization of root antennas;
and S4, carrying out maximum likelihood detection on the result obtained in S3 by the user of the receiver through inverse fast Fourier transform, and realizing a joint equalization process.
Further, S1, the transmitter user adds the cyclic prefix to the information to be transmitted and then passes through N by using a spatial modulation methodTOne of the root antennas performsThe specific method for sending comprises the following steps:
s1-1, wherein the data sequence of the information to be transmitted is { xn}, data sequence { xnN is more than or equal to 0 and less than or equal to N-1, and N is more than or equal to L; the L represents the length of the cyclic prefix CP,
Figure BDA0002348570330000054
indicating the number of resolvable paths of the information received by the receiver; k is a radical ofTThe antenna representing the information transmitted by the user of the transmitter is the kth antennaTRoot antenna, kT＝1,2,…,NT；
Data sequence u with cyclic prefix CP addedmSatisfy:
um＝x(N-L+m)mod(N),0≤m≤N+L-1；
s1-2, data sequence { umPerforming spatial modulation to obtain modulated information V:
Figure BDA0002348570330000052
v is to bemTransmitting through an antenna:
Figure BDA0002348570330000053
still further, the receiver user performs fast fourier transform on the received information and performs N in the frequency domain in S3RThe specific method of the root antenna joint equalization is as follows:
s2-1, the information r received by the receiver user is:
Figure BDA0002348570330000061
wherein V (: k) represents the k column vector of V,
nkis a Gaussian white noise vector of (N + L-1) x 1,
Figure BDA0002348570330000068
Figure BDA0002348570330000062
the matrix of the frequency selective fading channel is:
Figure BDA0002348570330000063
Figure BDA0002348570330000064
for the kth user from the transmitterTK-th arrival of a root antenna at a receiver userRThe multi-path channel gain coefficient vector of the root antenna has the length of L +1,
Figure BDA0002348570330000065
for the kth user from the transmitterTK-th arrival of a root antenna at a receiver userRChannel gain coefficients on the nth resolvable path among the multipath channel gains of the root antenna,
kRthe antenna indicating the reception of information by the user of the receiver is the kth antennaRRoot antenna, kR＝1,2,…,NR；
S2-2, receiving the signal r with the length of N + L by the user of the receiverkDo the cyclic prefix removal processing, i.e. delete { rmGet the first L data of N length sequence y to be equalizedkTo y forkIs obtained by fast Fourier transform
Figure BDA0002348570330000066
By
Figure BDA0002348570330000067
Forming a new received vector yFFT：
Figure BDA0002348570330000071
S2-3, k is more than or equal to any 1R≤NR,1≤kT≤NT，
Figure BDA0002348570330000072
Is obtained by fast Fourier transform
Figure BDA0002348570330000073
Forming a frequency domain channel state information matrix HFFT：
Figure BDA0002348570330000074
S2-4, using frequency domain channel state information matrix HFFTFor yFFTPerforming multi-antenna combined frequency domain equalization:
Figure BDA0002348570330000075
when zero-forcing equalization is used, W ═ HFFT)-1，
When the minimum mean square error technique is employed,
Figure BDA0002348570330000076
wherein N is0Is the noise single-side power spectral density, and I is the unit matrix.
Still further, in S4, the specific method for performing maximum likelihood detection on the result obtained in S3 by the receiver user using inverse fast fourier transform includes: for vector
Figure BDA0002348570330000077
Each element of (a) is subjected to maximum likelihood detection to obtain an output:
Figure BDA0002348570330000078
in the invention, the combined SM-SC-FDE equalization technology is adopted to equalize signals. The core idea of SC-FDE detection is to transform a complex deconvolution process that needs to be performed in the time domain to the frequency domain when a signal reaches a receiver end through a frequency selective fading channel for channel equalization through fast fourier transform, and to simplify operations through fast fourier transform. The combined SM-SC-FDE detection technology combines fast Fourier transform and spatial modulation, improves the performance of the spatial modulation under a frequency selective fading channel, and reduces the complexity of a receiver.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.

Claims (4)

1. Uplink spatial modulation single carrier frequency domain joint equalization method, characterized in that a transmitter user of the joint equalization method comprises NTRoot antenna, receiver user NRRoot antenna, NR＝NTThe specific process comprises the following steps:
s1, the transmitter user adds the information to be transmitted into the cyclic prefix by adopting the space modulation method and then passes through NTOne of the root antennas transmits;
s2, the information on different antennas is sent to the user of the receiver through different frequency selective fading channels;
s3, the receiver user carries out fast Fourier transform to the received information and carries out N in the frequency domainRJoint equalization of root antennas;
and S4, carrying out maximum likelihood detection on the result obtained in S3 by the user of the receiver through inverse fast Fourier transform, and realizing a joint equalization process.
2. The method for uplink spatial modulation single-carrier frequency-domain joint equalization according to claim 1, characterized in that said transmitter user employs S1Spatial modulation method, adding information to be transmitted into cyclic prefix and passing through NTThe specific method for transmitting by one of the root antennas is as follows:
s1-1, wherein the data sequence of the information to be transmitted is { xn}, data sequence { xnN is more than or equal to 0 and less than or equal to N-1, and N is more than or equal to L; the L represents the length of the cyclic prefix CP,
Figure FDA0002348570320000011
Figure FDA0002348570320000012
indicating the number of resolvable paths of the information received by the receiver; k is a radical ofTThe antenna representing the information transmitted by the user of the transmitter is the kth antennaTRoot antenna, kT＝1,2,…,NT；
Data sequence u with cyclic prefix CP addedmSatisfy:
um＝x(N-L+m)mod(N),0≤m≤N+L-1；
s1-2, data sequence { umPerforming spatial modulation to obtain modulated information V:
Figure FDA0002348570320000013
v is to bemTransmitting through an antenna:
Figure FDA0002348570320000014
3. the method for uplink spatial modulation single-carrier frequency-domain joint equalization according to claim 2, wherein S3 said receiver user performs a fast fourier transform on the received information, performs N in the frequency domainRThe specific method of the root antenna joint equalization is as follows:
s2-1, the information r received by the receiver user is:
Figure FDA0002348570320000021
wherein V (: k) represents the k column vector of V,
nkis a Gaussian white noise vector of (N + L-1) x 1,
Figure FDA0002348570320000022
Figure FDA0002348570320000023
the matrix of the frequency selective fading channel is:
Figure FDA0002348570320000024
Figure FDA0002348570320000025
for the kth user from the transmitterTK-th arrival of a root antenna at a receiver userRThe multi-path channel gain coefficient vector of the root antenna has the length of L +1,
Figure FDA0002348570320000026
for the kth user from the transmitterTK-th arrival of a root antenna at a receiver userRChannel gain coefficients on the nth resolvable path among the multipath channel gains of the root antenna,
kRthe antenna indicating the reception of information by the user of the receiver is the kth antennaRRoot antenna, kR＝1,2,…,NR；
S2-2, receiving the signal r with the length of N + L by the user of the receiverkDo the cyclic prefix removal processing, i.e. delete { rmGet the first L data of N length sequence y to be equalizedkTo y forkIs obtained by fast Fourier transform
Figure FDA0002348570320000027
By
Figure FDA0002348570320000028
Forming a new received vector yFFT：
Figure FDA0002348570320000031
S2-3, k is more than or equal to any 1R≤NR,1≤kT≤NT，
Figure FDA0002348570320000032
Is obtained by fast Fourier transform
Figure FDA0002348570320000033
Forming a frequency domain channel state information matrix HFFT：
Figure FDA0002348570320000034
S2-4, using frequency domain channel state information matrix HFFTFor yFFTPerforming multi-antenna combined frequency domain equalization:
Figure FDA0002348570320000035
when zero-forcing equalization is used, W ═ HFFT)-1，
When the minimum mean square error technique is employed,
Figure FDA0002348570320000036
wherein N is0Is the noise single-side power spectral density, and I is the unit matrix.
4. The method of claim 3, wherein the receiver users of S4 employ inverse fast Fourier transform for maximum likelihood detection of the result obtained at S3The specific method comprises the following steps: for vector
Figure FDA0002348570320000037
Each element of (a) is subjected to maximum likelihood detection to obtain an output:
Figure FDA0002348570320000038
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