CN105119644B - Single User MIMO system space division mode switching method based on SWIPT - Google Patents

Single User MIMO system space division mode switching method based on SWIPT Download PDF

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CN105119644B
CN105119644B CN201510582706.8A CN201510582706A CN105119644B CN 105119644 B CN105119644 B CN 105119644B CN 201510582706 A CN201510582706 A CN 201510582706A CN 105119644 B CN105119644 B CN 105119644B
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CN105119644A (en
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徐玉滨
冯雨晴
马琳
崔扬
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Harbin Institute of Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
    • H04B7/0808—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching comparing all antennas before reception
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Single User MIMO system space division mode switching method based on SWIPT, belongs to mimo system space division pattern switching field.Existing mimo system space division mode switching method can not be between energy mobile phone and information decoding both of which the problem of any switching laws.A kind of Single User MIMO system space division mode switching method based on SWIPT, the best user of user's condition is selected to carry out information transfer first, according to power water-filling algorithm distribution power and computing system and speedBy itself and the minimum transmission rate request R of systemminIt is compared, being unsatisfactory for system requirements then increases antenna computing system and speed again, untill meeting system requirements；Remaining all antenna is used for collection of energy, carries out energy distribution and transmission according to energy beam formation algorithm, the final receiving terminal that calculates collects energy summationThe mode of operation that the present invention is applied to the Single User MIMO system based on SWIPT technologies switches.

Description

Single-user MIMO system space division mode switching method based on SWIPT
Technical Field
The invention relates to a space division working strategy of an SWIPT system, in particular to a working mode switching strategy under the condition that a receiving end user has a plurality of antennas.
Background
The SWIPT receiving end is provided with two working modes of an Information receiving end (IR) and an Energy receiving End (ER) at the same time, and is respectively used for finishing two functions of Information Decoding (ID) and Energy collection (EH). Common mode switching algorithms include a time domain matching mode (TS), a frequency domain division mode (PS), a periodic switching mode, and the like.
The multiple input multiple output technology, namely the MIMO technology, can multiply the sum rate of a system and improve the utilization rate of frequency spectrum. For the condition that a receiving end of the system has a plurality of antennas, different antennas can work in two different working modes of information receiving and energy collection respectively through a space diversity method, and a zero forcing beam forming (ZBF) technology and an energy beam forming technology are combined respectively, so that a single-user MIMO system based on an SWIPT technology has higher energy efficiency on the premise of meeting the minimum transmission rate of the system.
However, the space division mode switching method of the existing MIMO system cannot switch between an energy mobile phone mode and an information decoding mode at will.
Disclosure of Invention
The invention aims to solve the problem that the space division mode switching method of the existing MIMO system can not be switched between an energy mobile phone mode and an information decoding mode at will, and provides a space division mode switching method of a single-user MIMO system based on SWIPT.
A space division mode switching method of a single-user MIMO system based on SWIPT is realized by the following steps:
step one, setting signal energy sent by a sending end as P, dividing the signal energy into two parts according to a coefficient alpha and respectively assigning the two parts to an IR part and an ER part of a receiving end, wherein the IR part refers to an information receiving end working mode, the ER part refers to an energy receiving end working mode, and the receiving energy of the IR part and the ER part is respectively expressed as:
P IR ＝αζP (1)
P ER ＝(1-α)ζP (2)
wherein the constant α represents the ratio of the IR part received energy in the total energy, and α = N ID /N，0<α&1; the constant ζ represents an energy attenuation coefficient, and ζ =1/| d- μ ，0<ζ&1,d denotes the distance between the transmitting end and the receiving end, mu denotes the attenuation factor; n is a radical of hydrogen ID The number of antennas representing the IR part for information reception; n represents the total number of antennas; let N ER Representing the number of antennas used by the ER portion for energy harvesting, N ER ＝N-N ID ；
Step two, setting the number of sending antennas of a sending end to be M, wherein M is less than or equal to N ID &N, each transmitting antenna adopts a multiplexing mode to transmit different information, a receiving antenna with the best receiving end channel condition is defined as an antenna 1 of an energy receiving end, power distribution is carried out through a power water injection method, and under an AWGN channel, a receiving signal of an information receiving antenna k is represented as:
wherein H represents a channel state matrix; x represents a transmission signal; k represents an antenna serial number; the first term represents the useful signal of the user antenna k; the second item represents multi-user interference information; z is a radical of k Representing white gaussian noise; p k Representing the transmission signal power of the transmitting end antenna k; h is k Representing the k row vector in the H matrix; w is a k Representing a weight vector; s k Represents the signal transmitted by antenna k; p j Representing a multi-user interference signal allocated power; w is a j Representing a weight vector; s j Represents the signal transmitted by antenna j;
and precoding by using a ZBF method, removing interference information in a received signal of the information receiving antenna k represented by the formula (3), and rewriting the formula (3) as follows under the condition of satisfying zero forcing constraint:
and the sum capacity calculation formula is as follows:
meanwhile, formula (5) satisfies:
in the formula, P k Denotes the transmission signal distribution power of the transmission antenna k at the transmitting end, Ω denotes the set of users participating in the communication, w k Representing a weight vector, d k Indicating the transmission of information; n is k Representing white noise;
step three, setting the minimum transmission rate required by the system as R min Comparing the sum capacity R calculated in the formula (5) in the second step ZFBF With the lowest transmission rate R min And determines whether to perform power allocation:
if R is ZEBF >R min If so, performing the operation of the step four, and then ending the power distribution of the IR part;
if R is REBF ≤R min Selecting the antenna with the best channel condition in the receiving end information receiving antennas to transmit information together with the information receiving antennas of the IR part in the step two, and traversing all N ID Repeating the process of the second step to carry out power distribution according to the information receiving antenna, and further calculating the information transmission rate until R ZEBF >R min Until the end;
step four, the receiving end utilizes the residual N ER Collecting energy from the energy collecting antenna, and collecting N ER Root energy harvesting antenna markers 1-N ER Then the energy collecting antenna j, j belongs to [ 1-N ] ER ]The received signals of (a) are:
the energy collected by the receiving end is as follows:
wherein E is the mathematical operator of the meanNumber P i The distribution power of a transmission signal of a transmission antenna j of a transmitting end is represented; h is j Representing the jth row vector in the H matrix; w is a i An ith column vector representing the weight matrix W; d i Representing the data sent by user i.
The invention has the beneficial effects that:
the space division mode switching algorithm of the single-user MIMO system based on the SWIPT technology provides a space division mode switching algorithm for a receiving end which can realize energy collection and information transmission at the same time and is provided with a plurality of antennas. Firstly, selecting a user with the best user condition for information transmission, distributing power according to a power water injection algorithm, calculating a system and a rate, comparing the power with the lowest transmission rate required by the system, and increasing an antenna to calculate the system and the rate again if the system requirement is not met until the system requirement is met; and all other antennas are used for energy collection, energy distribution and transmission are carried out according to an energy beam forming algorithm, and the sum of the collected energy of the receiving end is finally calculated.
Compared with the traditional switching mode, the method of the invention can flexibly select the receiving end antenna between the two modes of energy collection and information decoding, flexibly arrange the proper number of antennas with better channel conditions for information transmission according to the requirement of the system on the transmission rate, and collect the energy of the other antennas by utilizing the beam forming technology to supplement the energy for the receiving end. Compared with the traditional ZBF precoding method, the method has the advantages that on the premise of not reducing the system throughput, the surplus energy is utilized for energy collection, the energy utilization rate is improved, and the purpose of green communication is achieved.
Drawings
Fig. 1 is a diagram of a typical single-user MIMO downlink architecture;
FIG. 2 is a flow chart of a space division mode switching method of a single-user MIMO system based on SWIPT according to the present invention;
Detailed Description
The first embodiment is as follows:
the method for switching space division modes of a single-user MIMO system based on SWIPT according to the embodiment is implemented by the following steps, as shown in fig. 1:
step one, setting signal energy sent by a sending end as P, dividing the signal energy into two parts according to a coefficient alpha and respectively assigning the two parts to an IR part and an ER part of a receiving end, wherein the IR part refers to an information receiving end working mode, the ER part refers to an energy receiving end working mode, and the receiving energy of the IR part and the ER part is respectively expressed as:
P IR ＝αζP (1)
P ER ＝(1-α)ζP (2)
wherein the constant α represents the ratio of the IR part received energy in the total energy, and α = N ID /N，0<α&1; the constant ζ represents an energy attenuation coefficient, and ζ =1/| d- μ ，0<ζ&1,d represents the distance between the transmitting end and the receiving end, the energy attenuation coefficient zeta is inversely proportional to the distance d, mu represents the attenuation factor, and the smaller the attenuation factor, the larger the attenuation is; n is a radical of ID Indicating the number of antennas used by the IR part for information reception; n represents the total number of antennas; let N ER Representing the number of antennas used by the ER portion for energy harvesting, N ER ＝N-N ID ；
Step two, setting the number of sending antennas of a sending end to be M, wherein M is less than or equal to N ID &N, each transmitting antenna adopts a multiplexing mode to transmit different information, a receiving antenna with the best receiving end channel condition is defined as an antenna 1 of an energy receiving end, power distribution is carried out through a power water injection method, and under an AWGN channel, a receiving signal of an information receiving antenna k is represented as:
wherein, the AWGN channel is an additive white Gaussian noise channel; h represents a channel state matrix; x represents a transmission signal; k represents an antenna serial number; first item representationUseful signals of the user antenna k; the second item represents multi-user interference information; z is a radical of k Representing white gaussian noise; p k The sending signal power of a sending end antenna k is represented and obtained through a power water filling algorithm; h is k Representing the k row vector in the H matrix; representing a weight vector; s k Represents the signal transmitted by antenna k; p j Representing a multi-user interference signal allocated power; w is a j Representing a weight vector; s j Represents the signal transmitted by antenna j;
and precoding by using a ZBF method, removing interference information in a received signal of the information receiving antenna k represented by the formula (3), and rewriting the formula (3) as follows under the condition of satisfying zero forcing constraint:
and the sum capacity calculation formula is as follows:
meanwhile, equation (5) satisfies:
in the formula, the ZFBF method is called zero-shaping beamforming, and the chinese meaning zero-forcing beam forming algorithm is a precoding algorithm; p k Denotes the transmission signal distribution power of a transmission antenna k at the transmitting end, Ω denotes the set of users participating in communication, w k Representing a weight vector, d k Indicating the transmission of information; n is k Representing white noise;
step three, setting the minimum transmission rate required by the system as R min Comparing the sum capacity R calculated in the formula (5) in the second step ZFBF With the lowest transmission rate R min And determines whether to perform power allocation:
if R is ZEBF >R min If so, performing the operation of the step four, and then ending the power distribution of the IR part;
if R is REBF ≤R min Selecting the antenna with the best channel condition in the receiving end information receiving antennas to transmit information together with the information receiving antennas of the IR part in the step two, and traversing all N ID Repeating the process of the second step to carry out power distribution according to the information receiving antenna, and further calculating the information transmission rate until R ZEBF >R min Until the end;
step four, the receiving end utilizes the residual N ER Collecting energy from the energy collecting antenna, and collecting N ER Root energy harvesting antenna markers 1-N ER Then the energy collecting antenna j, j belongs to [ 1-N ] ER ]The received signals of (a) are:
the energy collected by the receiving end is as follows:
wherein E is a mathematical operation symbol of taking an average value, P i The distribution power of a transmission signal of a transmission antenna j of a transmitting end is represented; h is j Representing the jth row vector in the H matrix; w is a i An ith column vector representing the weight matrix W; d i Representing the data sent by user i.
The second embodiment is as follows:
different from the first specific embodiment, in the method for switching space division mode of single-user MIMO system based on SWIPT of the present embodiment, the second step is to perform precoding by using ZFBF method, remove the interference information in the received signal of the information receiving antenna k represented by the formula (3), and rewrite the formula (3) under the condition of satisfying the zero forcing constraint,
firstly, a receiving end simply takes multi-user interference as white noise, and the maximum sum capacity achieved by the BF pre-coding method is as follows:
wherein the content of the first and second substances,
secondly, precoding by using ZBF, if zero forcing constraint conditions are met:
in the case of (3), the formula is rewritten as:
and solving a user signal matrix H (omega) pseudo-inverse matrix mode under the condition of zero forcing constraint, and obtaining a beam forming weight vector W to give the weight vector W mentioned above:
the third concrete implementation mode:
different from the first or second specific embodiments, in the space division mode switching method for the single-user MIMO system based on SWIPT of the present embodiment, the process of performing power distribution by the power water injection method in the second step is that the better the channel condition of the power water injection method is, the smaller the influence of channel noise is, the more power is distributed; conversely, the worse the channel condition, the more affected the channel noise, the less power is allocated, and if the channel condition is too bad, the power is not allocated.
First, the desired average power distribution line is represented by water injection line μ, which is:
and the transmission signal distribution power of the transmission antenna k of the transmitting end is as follows:
secondly, power distribution is carried out:
if there is a negative value in the power allocation, the allocated power is zero, and the first step is repeated until each power allocated to the IR portion has a positive value, and the present invention can be applied to other embodiments, and those skilled in the art can make various changes and modifications according to the present invention without departing from the spirit and the spirit of the present invention, and these changes and modifications should fall within the scope of the appended claims.

Claims (3)

1. A space division mode switching method of a single-user MIMO system based on SWIPT is characterized in that: the method is realized by the following steps:
step one, setting signal energy sent by a sending end as P, dividing the signal energy into two parts according to a coefficient alpha and respectively assigning the two parts to an IR part and an ER part of a receiving end, wherein the IR part refers to an information receiving end working mode, the ER part refers to an energy receiving end working mode, and the receiving energy of the IR part and the ER part is respectively expressed as:
P IR ＝αζP (1)
P ER ＝(1-α)ζP (2)
wherein the constant alpha represents I in the total energyR part receiving energy ratio, and a = N ID /N，0<α&1; the constant ζ represents an energy attenuation coefficient, and ζ =1/| d- μ ，0<ζ&1,d represents the distance between the transmitting end and the receiving end, mu represents the attenuation factor; n is a radical of ID Indicating the number of antennas used by the IR part for information reception; n represents the total number of antennas; let N ER Representing the number of antennas used by the ER portion for energy harvesting, N ER ＝N-N ID ；
Step two, setting the number of sending antennas of a sending end to be M, wherein M is less than or equal to N ID &N, each transmitting antenna adopts a multiplexing mode to transmit different information, a receiving antenna with the best receiving end channel condition is defined as an antenna 1 of an energy receiving end, power distribution is carried out through a power water injection method, and under an AWGN channel, a receiving signal of an information receiving antenna k is represented as:
wherein H represents a channel state matrix; x represents a transmission signal; k represents an antenna serial number; the first term represents the useful signal of the user antenna k; the second item represents multi-user interference information; z is a radical of formula k Representing white gaussian noise; p is k The transmitting signal power of the antenna k at the transmitting end is represented; h is k Representing the k row vector in the H matrix; w is a k Representing a weight vector; s k Represents the signal transmitted by antenna k; p j Representing a multi-user interference signal allocated power; w is a j Representing a weight vector; s j Represents the signal transmitted by antenna j;
and precoding by using a ZBF method, removing interference information in a received signal of the information receiving antenna k represented by the formula (3), and rewriting the formula (3) as follows under the condition of satisfying zero forcing constraint:
and the sum capacity calculation formula is:
meanwhile, equation (5) satisfies:
in the formula, P k Denotes the transmission signal distribution power of a transmission antenna k at the transmitting end, Ω denotes the set of users participating in communication, w k Representing a weight vector, d k Indicating the transmission of information; n is k Representing white noise;
step three, setting the minimum transmission rate required by the system as R min Comparing the sum capacity R calculated in the formula (5) in the second step ZFBF And the lowest transmission rate R min And determines whether to perform power allocation:
if R is ZEBF >R min If so, performing the operation of the step four, and then ending the power distribution of the IR part;
if R is REBF ≤R min Selecting the antenna with the best channel condition in the receiving end information receiving antenna to transmit information together with the IR part information receiving antenna in the step two, traversing all N ID Repeating the process of the second step to carry out power distribution according to the information receiving antenna, and further calculating the information transmission rate until R ZEBF >R min Until the end;
step four, the receiving end utilizes the residual N ER Collecting energy by an energy collecting antenna, and collecting N ER Root energy harvesting antenna markers 1-N ER Then the energy collecting antenna j, j belongs to [ 1-N ] ER ]The received signals of (a) are:
the energy collected by the receiving end is as follows:
wherein E is a mathematical operation symbol of taking an average value, P i The distribution power of a transmission signal of a transmission antenna j of a transmitting end is represented; h is j Representing the jth row vector in the H matrix; w is a i An ith column vector representing the weight matrix W; d i Representing the data sent by user i.
2. The method for switching space division mode of single-user MIMO system based on SWIPT as claimed in claim 1, wherein: step two, precoding by using a ZBF method, removing interference information in a receiving signal of an information receiving antenna k represented by the formula (3), and rewriting the formula (3) under the condition of meeting zero forcing constraint,
firstly, a receiving end regards multi-user interference as white noise, and the maximum sum capacity achieved by the BF pre-coding method is as follows:
wherein the content of the first and second substances,
secondly, precoding by using ZBF, if zero forcing constraint conditions are met:
in the case of (3), the formula (3) is rewritten as:
and obtaining a beam forming weight vector W by solving a user signal matrix H (omega) pseudo-inverse matrix mode under the condition of zero forcing constraint:
3. the SWIPT-based spatial division mode switching method for the single-user MIMO system according to claim 1 or 2, wherein: step two the process of power distribution by the power water injection method is,
first, the desired average power distribution line is represented by water injection line μ, which is:
and the transmission signal distribution power of the transmission antenna k of the transmitting end is as follows:
secondly, power distribution is carried out:
and if negative values exist in the power distribution, the power distribution is zero, the first step is repeated for iteration, and the iteration is ended until each power distributed to the IR part is a positive value.
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CN108848558B (en) * 2018-05-04 2020-06-19 华南理工大学 Adaptive time slot signal receiving method of SWIPT system based on nonlinear energy collection
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CN109474297B (en) * 2018-12-28 2020-07-14 华侨大学 Full-duplex information and energy simultaneous transmission antenna mode switching transceiver and transceiving method
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