CN110856261A - Inter-code crosstalk considered MIMO-PLC system subcarrier allocation method - Google Patents

Inter-code crosstalk considered MIMO-PLC system subcarrier allocation method Download PDF

Info

Publication number
CN110856261A
CN110856261A CN201911125429.2A CN201911125429A CN110856261A CN 110856261 A CN110856261 A CN 110856261A CN 201911125429 A CN201911125429 A CN 201911125429A CN 110856261 A CN110856261 A CN 110856261A
Authority
CN
China
Prior art keywords
mimo
power
plc system
intersymbol interference
matrix
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911125429.2A
Other languages
Chinese (zh)
Inventor
李国成
陆俊
蔡鹏�
徐志强
龚钢军
王赟
刘向军
李映雪
肖振锋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
North China Electric Power University
Original Assignee
North China Electric Power University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by North China Electric Power University filed Critical North China Electric Power University
Priority to CN201911125429.2A priority Critical patent/CN110856261A/en
Publication of CN110856261A publication Critical patent/CN110856261A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • 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
    • H04B7/0413—MIMO systems
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Radio Transmission System (AREA)

Abstract

The invention provides a subcarrier distribution method of an MIMO-PLC system considering intersymbol interference. Under the condition that different subcarriers share the same input or output end to generate intersymbol interference, the method collects the signal-to-noise ratio information and the resource information to be distributed of each subchannel, calculates the MIMO-PLC power matrix weighted by the bit error rate threshold, distributes the subcarriers bit by bit based on the power minimum criterion considering inhibiting the intersymbol interference, and distributes the subcarriers according to a single-input single-output distribution method, thereby effectively improving the intersymbol interference resistance of the MIMO-PLC system.

Description

Inter-code crosstalk considered MIMO-PLC system subcarrier allocation method
Technical Field
The invention belongs to the field of modern Multiple-Input Multiple-Output-Power line Communication (MIMO-PLC), and particularly relates to a subcarrier allocation method of an MIMO-PLC system considering intersymbol interference.
Background
MIMO-PLC communication is a research hotspot in recent years, and Orthogonal Frequency Division Multiplexing (OFDM) is one of important technologies for implementing MIMO-PLC. The normal operation of the multi-user MIMO-PLC system needs to depend on a resource allocation module, which is mainly the allocation of subcarriers. Therefore, the capacity of a communication channel can be improved or the power required by communication can be reduced by optimizing the allocation method of the sub-carriers. The reasonable subcarrier allocation method can maximally stimulate the channel potential and improve the resource allocation performance of the power line communication system.
Aiming at the problems that the conventional subcarrier distribution method is mainly used for Single-input Single-Output Power line Communication (SISO-PLC) system, intersymbol interference of the MIMO-PLC system is not considered, and obvious defects exist in subcarrier distribution effect of the MIMO-PLC system, the method calculates an MIMO-PLC Power matrix weighted by an error rate threshold by collecting signal-to-noise ratio information of each subchannel and resource information to be distributed on the basis of fully considering the intersymbol interference problem of the MIMO-PLC system, distributes subcarriers bit by bit on the basis of the Power minimum criterion considering inhibiting intersymbol interference, and distributes the subcarriers according to the distribution method of the SISO-PLC system, thereby effectively improving the intersymbol interference resistance of the MIMO-PLC system.
Disclosure of Invention
The invention aims to provide a subcarrier allocation method of an MIMO-PLC system considering intersymbol interference, which specifically comprises the following steps:
s1, acquiring signal-to-noise ratio information of each sub-channel and resource information to be distributed;
s2, an MIMO-PLC power matrix weighted by an error rate threshold;
s3, allocating subcarriers bit by bit based on a power minimum criterion considering suppressing intersymbol interference;
and S4, distributing the sub-carriers according to a sub-carrier distribution method of the SISO-PLC system.
Compared with the general technology, the invention fully considers the problem of intersymbol interference in the MIMO-PLC system in the aspect of subcarrier allocation, calculates the power matrix meeting a certain bit error rate condition by acquiring the signal-to-noise ratio information of each subchannel, allocates the subcarriers bit by bit based on the power minimum criterion considering inhibiting intersymbol interference, and allocates the subcarriers according to a single-input single-output subcarrier allocation method, thereby effectively improving the subcarrier power allocation effectiveness and the resource allocation performance of the MIMO-PLC communication system.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is a diagram of a typical application scenario of the method of the present invention.
Detailed Description
The preferred embodiments will be described in detail below with reference to the accompanying drawings. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application. Referring to FIG. 1, a flow chart of the method of the present invention is shown, and the method of the present invention is further described with reference to specific examples.
A specific example application scenario is shown in fig. 2. The power line communication network comprises 3 power line carrier machine input ends and 3 power line carrier machine output ends. A certain number of sub-carriers need to be allocated to sub-channels between different inputs and outputs for transmission. Considering that intersymbol interference can be generated when different subcarriers share the input end of the same power line carrier machine or the output end of the same power line carrier machine, the distribution scheme which is easy to generate intersymbol interference is avoided through the weighting power coefficient.
The invention provides a method for distributing subcarriers of an MIMO-PLC system in consideration of intersymbol interference, which comprises the following steps:
s1, acquiring signal-to-noise ratio information of MIMO-PLC sub-channels and information of resources to be distributed
Let MIMO-PLC system contain NT(2≤NTLess than or equal to 100) inputs, NR(2≤NRLess than or equal to 100) outputs; let the sub-channel SNR between the ith input and the jth output be SNRi,j(1≤i≤NT,1≤j≤NR) (ii) a Defining a channel signal-to-noise ratio matrix as
Figure BDA0002276682730000031
And setting the number of the sub-carriers to be distributed as N (N is more than or equal to 4 and less than or equal to 128).
In an example, the MIMO-PLC system contains NT3 inputs, NR3 outputs; let the sub-channel SNR between the ith input and the jth output be SNRi,j(1≤i≤NT,1≤j≤NR) (ii) a The channel signal-to-noise ratio matrix is
Figure BDA0002276682730000032
The number of the sub-carriers to be distributed is N (N is more than or equal to 4 and less than or equal to 128).
S2, calculating the weighted MIMO-PLC power matrix of the bit error rate threshold
Setting the threshold value of error rate required by information transmission as w (w is more than 0 and less than or equal to 0.1), and setting input end Ni(1≤i≤NT) And an output terminal Nj(1≤j≤NR) The power of the unit bit subcarrier loaded under the condition of meeting the requirement of the bit error rate is Pi，j. According to the formula
Figure BDA0002276682730000033
Calculating the power matrix when the power is distributed for the kth time (k is more than or equal to 1 and less than or equal to N)
In the example, let the threshold w of the error rate required for information transmission be 0.05, and let the input terminal N beiAnd an output terminal NjThe power of loading a unit subcarrier under the requirement of meeting the threshold value of the error rate is Pi,j. According to the formula
Figure BDA0002276682730000035
Calculating power and generating a power matrix
Figure BDA0002276682730000036
S3, distributing sub-carriers bit by bit based on power minimum criterion considering restraining intersymbol interference
Setting the crosstalk coefficient between codes as lambda (1-lambda)5) (ii) a Let the allocation matrix be a. Finding a power matrix P based on a power minimization criterion1Element P with the smallest median valuei,j 1Allocating a unit subcarrier to the corresponding subchannel, for the allocation matrix a element aij(0≤aijN) update aij＝aij+ 1; considering the influence of suppressing intersymbol interference, according to the formula
Figure BDA0002276682730000041
Updating the power matrix; and repeating the steps according to the updated power matrix to continuously allocate the rest subcarriers until k is equal to N.
In the example, the inter-code crosstalk coefficient λ is 2; setting distribution matrix
Figure BDA0002276682730000042
Finding Power matrix P based on Power minimum criterion1Element P with the smallest median value3,1 1Allocating a unit subcarrier to the corresponding subchannel; the corresponding element A of the allocation matrix3,1＝A3,1+1, when the power matrix is
Figure BDA0002276682730000043
Considering the influence of suppressing intersymbol interference, according to the formula
Figure BDA0002276682730000044
Updating a power matrix, the updated power matrix
Figure BDA0002276682730000045
And repeating the steps according to the updated power matrix to continuously allocate the rest subcarriers until k is 8. Final distribution matrix obtained in the example
Figure BDA0002276682730000051
S4, distributing the sub-carriers according to the sub-carrier distribution method of the SISO-PLC system
The allocation matrix a is queried to obtain the number of sub-carriers to be allocated to each sub-channel. The system is degenerated into a SISO-PLC system, and the sub-carriers allocated between a specific input and output may be further allocated according to a method of processing the SISO-PLC system.
In an example, a query distribution matrix
Figure BDA0002276682730000052
The number of sub-carriers required to be allocated for each sub-channel can be obtained. The system degeneracy is a SISO-PLC system, and the sub-carriers allocated between a specific input and output can be further allocated according to a method of processing a single input single output system.

Claims (4)

1. A method for distributing subcarriers of an MIMO-PLC system in consideration of intersymbol interference comprises the following steps:
s1, acquiring signal-to-noise ratio information and resource information to be distributed of each sub-channel;
s2, calculating an MIMO-PLC power matrix weighted by an error rate threshold;
s3, allocating subcarriers bit by bit based on a power minimum criterion considering suppressing intersymbol interference;
and S4, distributing the sub-carriers according to a sub-carrier distribution method of the SISO-PLC system.
2. The method for allocating subcarriers of the MIMO-PLC system according to claim 1, wherein in step S1, the MIMO-PLC system comprises NT(2≤NTLess than or equal to 100 inputs, NR(2≤NRLess than or equal to 100) outputs; the sub-channel signal-to-noise ratio between the ith input and the jth output is SNRi,j(1≤i≤NT,1≤j≤NR) (ii) a The channel signal-to-noise ratio matrix is
Figure FDA0002276682720000011
The number of the sub-carriers to be distributed is N (N is more than or equal to 4 and less than or equal to 128).
3. The method for allocating subcarriers of an MIMO-PLC system according to claim 1, wherein in step S2, the threshold of the error rate required for information transmission is w (0 < w ≦ 0.1), and the input end N isi(1≤i≤NT) And an output terminal Nj(1≤j≤NR) The power consumed by loading the unit bit subcarrier under the condition of meeting the requirement of the error rate is Pi，j(ii) a According to the formula
Figure FDA0002276682720000012
Calculating the power matrix when the power is distributed for the kth time (k is more than or equal to 1 and less than or equal to N)
Figure FDA0002276682720000013
4. The method for allocating subcarriers of MIMO-PLC system considering intersymbol interference according to claim 1, wherein in step S3, the intersymbol interference coefficient λ (1 ≦ λ ≦ 5); the distribution matrix is A; finding a power matrix P based on a power minimization criterion1Element P with the smallest median valuei,j 1Allocating a unit subcarrier to the corresponding subchannel, for the allocation matrix a element aij(0≤aijN) update
Figure FDA0002276682720000022
Considering the influence of suppressing intersymbol interference, according to the formula
Figure FDA0002276682720000021
Adjusting the updated power matrix; and repeating the steps according to the updated power matrix to continuously allocate the rest subcarriers until k is equal to N.
CN201911125429.2A 2019-11-18 2019-11-18 Inter-code crosstalk considered MIMO-PLC system subcarrier allocation method Pending CN110856261A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911125429.2A CN110856261A (en) 2019-11-18 2019-11-18 Inter-code crosstalk considered MIMO-PLC system subcarrier allocation method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911125429.2A CN110856261A (en) 2019-11-18 2019-11-18 Inter-code crosstalk considered MIMO-PLC system subcarrier allocation method

Publications (1)

Publication Number Publication Date
CN110856261A true CN110856261A (en) 2020-02-28

Family

ID=69601781

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911125429.2A Pending CN110856261A (en) 2019-11-18 2019-11-18 Inter-code crosstalk considered MIMO-PLC system subcarrier allocation method

Country Status (1)

Country Link
CN (1) CN110856261A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112165372A (en) * 2020-08-12 2021-01-01 国网江西省电力有限公司经济技术研究院 Power distribution MIMO power line communication transmission method
CN112511194A (en) * 2020-11-23 2021-03-16 国网江西省电力有限公司经济技术研究院 Bit allocation method and device for MIMO-PLC system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112165372A (en) * 2020-08-12 2021-01-01 国网江西省电力有限公司经济技术研究院 Power distribution MIMO power line communication transmission method
CN112511194A (en) * 2020-11-23 2021-03-16 国网江西省电力有限公司经济技术研究院 Bit allocation method and device for MIMO-PLC system

Similar Documents

Publication Publication Date Title
CN100583705C (en) Multi-carrier communication with time division multiplexing and carrier-selective loading
US7440437B2 (en) Method and apparatus for scheduling downlink channels in an orthogonal frequency division multiple access system and a system using the same
US7916623B2 (en) Method of allocating wireless resources in a multi-carrier system
CN107949065B (en) A kind of adaptive bit power distribution method of NOMA
KR20050046303A (en) Apparatus and method for dynamic channel assignment and assignment of pilot channel in mimo-ofdm/ sdm system
CN102025461B (en) Frequency domain scheduling method and device
KR20050123434A (en) Resource allocation technique for multi-carrier based communication system
CN111163520A (en) Dynamic resource allocation method of low-earth-orbit satellite communication system
CN102355672A (en) Method for allocating adaptive resources in cognitive OFDM (orthogonal frequency division multiplexing) system
CN110856261A (en) Inter-code crosstalk considered MIMO-PLC system subcarrier allocation method
US20070121666A1 (en) Apparatus and method for allocating subchannel and power in communication system, and transmitting apparatus
WO2006090486A1 (en) Communications systems
KR20070000321A (en) Dynamic channel allocation method in a orthogonal frequency division multiple access mobile communication system
JP4302741B2 (en) Adaptive resource allocation apparatus and method for multi-channel communication system
CN103414675B (en) Broadband power line ofdm system single user fast bit loading method
CN109379173B (en) Subcarrier distribution method and device based on reverse channel power in OFDMA system
CN105846985A (en) Broadband power line OFDM subcarrier bit loading method based on curve fitting
CN113056015B (en) Power distribution method of NOMA downlink system under non-ideal channel state information
CN101990777B (en) Multi-carrier resource scheduling method and apparatus
CN109474413B (en) Allocation method for multiple downlink user multiple carriers of OFDMA system
CN109600858B (en) Low-complexity user scheduling method under non-orthogonal multiple access mechanism
Yu et al. Adaptive subcarrier and bit allocation in OFDMA systems supporting heterogeneous services
Seyman et al. A Novel Subcarrier Allocation Algorithm for MC–CDMA Systems
Lande et al. Adaptive subcarrier and bit allocation for downlink ofdma system with proportional fairness
CN108989012B (en) Fairness-based power distribution method for non-orthogonal multiple access technology

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20200228

WD01 Invention patent application deemed withdrawn after publication