CN108270607A - A kind of method and device of microwave communication - Google Patents
A kind of method and device of microwave communication Download PDFInfo
- Publication number
- CN108270607A CN108270607A CN201710001226.7A CN201710001226A CN108270607A CN 108270607 A CN108270607 A CN 108270607A CN 201710001226 A CN201710001226 A CN 201710001226A CN 108270607 A CN108270607 A CN 108270607A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Transmission System (AREA)
Abstract
The invention discloses a kind of method and devices of microwave communication, by the present invention in that composition XPIC groups in the equipment of multiple-input multiple-output microwave transport equipment, equipment room forms MIMO groups, when interfering or decaying initiation business Transmission, the period carries out active recovery to failure business unit at preset timed intervals, that is, the present invention can be all the way or in the case of the failure of a few road business unit, the active for carrying out failure business unit restores, to restore failure business after fault recovery normal transmission ability, so as to avoid, certain is all the way in the prior art or multi-channel service unit breaks down and leads to other not available problems of road business.
Description
Technical field
The present invention relates to field of communication technology, more particularly to a kind of method and device of microwave communication.
Background technology
Microwave communication is widely used now as a kind of means of communication, due to increasing sharply for business and bandwidth, frequency point
Resource seems more and more wellr sold and in short supply, and a frequency point can be applied to polarization direction using the polarization interference cancellation techniques of XPIC and MIMO
Four different tunnel business simultaneous transmissions avoid interfering with each other, and increase channel capacity while improving frequency point service efficiency.
XPIC cross polarization interference cancellations are a kind of technologies that CCDP is coordinated to use.CCDP utilizes the orthogonal polarization of two-way
Wave transmission signal realizes that transmission capacity doubles, and XPIC is then used for eliminating the cross jamming between two-way polarized wave.Ideally,
2 of CCDP are orthogonal signalling with frequency microwave signal, no matter will not be interfered therebetween, but under the conditions of Practical Project
How is the orthogonality of two signals, always to be influenced by antenna XPD and transmission deterioration, unavoidable meeting presence signal
Between interference.In order to offset these interference, it is necessary to use XPIC technologies.The basic principle of XPIC technologies is from horizontal and vertical
Signal is received in straight two polarization directions, and the two is subjected to certain processing so as to recover original letter from disturbed signal
Number.
Fig. 1 is the principle schematic of CCDP and XPIC, and Modem Horizontal and Modem Vertical are sent respectively
Two-way is identified as the two-way business of solid line and dotted line, and two-way business is transmitted by CCDP using orthogonal two paths of signals, to termination
Receive be isolated by filtration out after interference signal after the two paths of signals of doping interference with recovered after another way signal cancellation it is original
Two-way business.
MIMO technique (Multiple-Input Multiple-Output, MIMO) refers in transmitting terminal and connects
Receiving end uses multiple transmitting antennas and reception antenna, and signal is made to pass through the mutiple antennas transmission of transmitting terminal and receiving terminal and receive,
So as to improve communication quality.It can make full use of space resources, and multiple-input multiple-output is realized by mutiple antennas, not increase frequency spectrum money
In the case of source and antenna transmission power, system channel capacity can be increased exponentially.MIMO technology is broadly divided into two classes：It is empty
Between diversity and spatial reuse, this system use space diversity method.
Fig. 2 is the principle schematic of MIMO, and transmitting terminal is mapped to more antennas by the signal that space and time mapping will be sent
On send, signal that each antenna receives is carried out performing space-time decoding so as to recover the letter of transmitting terminal transmission by receiving terminal
Number.
In MIMO+XPIC networkings, each channel of eating dishes without rice or wine all receives the component from four polarized signals in opposite end, is applying
When the method for MIMO+XPIC is transmitted, if (either two-way or three tunnels) business unit breaks down or because of weather all the way
Reason, which receives signal variation, to be caused to receive exception and can be led in the case of providing offseting signal without the another three roads business unit of normal direction
Cause all not available situation of four road business unit.
Invention content
The present invention provides a kind of method and device of microwave communication, to solve in the prior art, certain is all the way or multi-channel service
Unit breaks down and leads to other not available problems of road business.
One aspect of the present invention provides a kind of method of microwave communication, including：
At least two multiple-input multiple-output microwave transport equipments are set, make to form in the equipment of multiple-input multiple-output microwave transport equipment
XPIC groups, equipment room composition MIMO groups；
In business Transmission, at preset timed intervals the period to failure business unit carry out active recovery, if business is extensive
Multiple success, then terminate, otherwise wait for subsequent time period and continue to attempt to restore, until business recovery success；
The failure business unit is primary polarization direction business unit, the primary polarization direction business unit in space, secondary use
One or more of polarization direction business unit and space time polarization direction business unit.
Further, when the failure business unit is one, the period is to the progress of failure business unit at preset timed intervals
Actively restore, specifically include：
Close the failure business unit, and close the failure business unit XPIC cancel functions business unit and
MIMO cancel function business unit；
According to the preset period of time that time series generating algorithm generates, opening failure service transmitting unit is timed extensive
It is multiple, until business recovery success.
Further, the closing fault business unit, specifically includes：When the business of the failure business unit is persistently lost
After locking for the first predetermined time, the failure business unit is closed；
The preset period of time generated according to time series generating algorithm is opened failure service transmitting unit and is determined
Shi Huifu is specifically included：
According to time series generating algorithm generate preset period of time, preset period of time then after, by failure industry
Radio frequency transmitting element where business unit opened for the second predetermined time, notified that partner's transmission unit of the failure business unit will
The out-of-lock detection time is adjusted to the third predetermined time, the second predetermined time then after, if partner's transmission unit is lock-out state,
Failure business recovery success, removes timer, if the second predetermined time then after, partner's transmission unit is out-of-lock condition
Failure business recovery fails, and closes the failure business unit, otherwise waits for after lower certain preset period of time arrives, continuing to attempt to
Restore, until business recovery success；
Wherein, the third predetermined time was more than for the second predetermined time；
When the failure business unit is the business unit of MIMO cancel functions, partner's transmission unit is another
The business unit of MIMO cancel functions, when the business unit that the failure business unit is XPIC cancel functions, the partner passes
Defeated unit is the business unit of another XPIC cancel function.
Further, when business unit of the failure business unit for two MIMO cancel functions, period at preset timed intervals
Active recovery is carried out to failure business unit, is specifically included：
The failure business unit of MIMO cancel functions first to break down is closed, by the MIMO cancel functions of rear failure
Failure business unit open, and the MIMO cancel function business unit of closing fault business unit；
The preset period of time generated according to time series generating algorithm is timed recovery, opens the MIMO of failure
The failure business unit of cancel function is attempted actively to restore, if business recovery success, terminates, otherwise waits for future time week
Phase continues to attempt to restore, until business recovery success；
When business unit of the failure business unit for two XPIC cancel functions, the period is to failure business at preset timed intervals
Unit carries out active recovery, specifically includes：
The failure business unit of XPIC cancel functions first to break down is closed, by the XPIC cancel functions of rear failure
Failure business unit open, and the XPIC cancel function business unit of closing fault business unit；
The preset period of time generated according to time series generating algorithm is timed recovery, opens the XPIC of failure
The failure business unit of cancel function is attempted actively to restore, if business recovery success, terminates, otherwise waits for future time week
Phase continues to attempt to restore, until business recovery success.
When failure business unit is the business unit of XPIC cancel function and the business sheet of a MIMO cancel function
When first, at preset timed intervals the period to failure business unit carry out active recovery, specifically include：
The failure business sheet of the failure business unit of the XPIC cancel functions of closing fault and the MIMO cancel functions of failure
Member, and the XPIC cancel functions business unit of the failure business unit of the XPIC cancel functions of closing fault and failure
The MIMO cancel function business unit of the failure business unit of MIMO cancel functions；
The preset period of time generated according to time series generating algorithm is timed recovery, opens the XPIC of failure
The failure business unit of the failure business unit of cancel function and the MIMO cancel functions of failure is attempted actively to restore, if business
It is successfully recovered, then terminates, otherwise wait for subsequent time period and continue to attempt to restore, until business recovery success.
Further, the failure business unit for opening the XPIC cancel functions to break down and the MIMO of failure are offset
The failure business unit of function is attempted actively to restore, and specifically includes：
By the failure business unit of the XPIC cancel functions of failure and the failure business unit of the MIMO cancel functions of failure
It opens, and the failure business unit of the MIMO cancel functions of the failure business unit and failure of the XPIC cancel functions of failure carries out
It is synchronous to restore.
Another aspect of the present invention provides a kind of device of microwave communication, including：
Setting unit sets at least one multiple-input multiple-output microwave transport equipment, makes setting for multiple-input multiple-output microwave transport equipment
Standby interior composition XPIC groups, equipment room composition MIMO groups；
Recovery unit, in business Transmission, the period to be actively extensive to the progress of failure business unit at preset timed intervals
It is multiple, if business recovery success, terminates, otherwise wait for subsequent time period and continue to attempt to restore, until business recovery success；
The failure business unit is primary polarization direction business unit, the primary polarization direction business unit in space, secondary use
One or more of polarization direction business unit and space time polarization direction business unit.
Further, the recovery unit is additionally operable to, and when the failure business unit is one, closes the failure industry
Business unit, and close the XPIC cancel functions business unit of the failure business unit and MIMO cancel function business unit；It presses
According to the preset period of time that time series generating algorithm generates, open failure service transmitting unit and be timed recovery, until industry
Business is successfully recovered.
Further, the recovery unit is additionally operable to, and is made a reservation for when the business of the failure business unit continues losing lock first
After time, the failure business unit is closed；According to the preset period of time that time series generating algorithm generates, in preset time
Period then after, by where failure business unit radio frequency transmitting element open the second predetermined time, notify the failure business
The out-of-lock detection time is adjusted to the third predetermined time by partner's transmission unit of unit, the second predetermined time then after, if partner
Be lock-out state with transmission unit, timer is removed in failure business recovery success, if the second predetermined time then after,
Partner's transmission unit fails for out-of-lock condition failure business recovery, closes the failure business unit, otherwise waits for lower certain pre-
If after the time cycle arrives, continuing to attempt to restore, until business recovery success；Wherein, the third predetermined time is more than the second pre- timing
Between；When the failure business unit is the business unit of MIMO cancel functions, partner's transmission unit is another MIMO
The business unit of cancel function, when the business unit that the failure business unit is XPIC cancel functions, the partner is transmitted single
Member is the business unit of another XPIC cancel function.
Further, the recovery unit is additionally operable to, when business sheet of the failure business unit for two MIMO cancel functions
When first, the failure business unit of MIMO cancel functions first to break down is closed, by the MIMO cancel functions of rear failure
Failure business unit is opened, and the MIMO cancel function business unit of closing fault business unit；It generates and calculates according to time series
The preset period of time that method generates is timed recovery, and the failure business unit for opening the MIMO cancel functions of failure is attempted
Actively restore, if business recovery success, terminates, otherwise wait for subsequent time period and continue to attempt to restore, until business is extensive
Multiple success；When business unit of the failure business unit for two XPIC cancel functions, close the XPIC first to break down and offset
The failure business unit of function is opened the failure business unit of the XPIC cancel functions of rear failure, and closing fault industry
The XPIC cancel function business unit of business unit；The preset period of time generated according to time series generating algorithm is timed extensive
Multiple, the failure business unit for opening the XPIC cancel functions of failure is attempted actively to restore, if business recovery success, is tied
Beam otherwise waits for subsequent time period and continues to attempt to restore, until business recovery success.When failure business unit is an XPIC
During the business unit of the business unit of cancel function and MIMO cancel function, the failure of the XPIC cancel functions of closing fault
The failure business unit of business unit and the MIMO cancel functions of failure, and the failure business of the XPIC cancel functions of closing fault
The MIMO cancel functions of the failure business unit of the XPIC cancel functions business unit of unit and the MIMO cancel functions of failure
Business unit；The preset period of time generated according to time series generating algorithm is timed recovery, opens failure
The failure business unit of the failure business unit of XPIC cancel functions and the MIMO cancel functions of failure is attempted actively to restore, if
Business recovery success, then terminate, otherwise wait for subsequent time period and continue to attempt to restore, until business recovery success.
Further, the recovery unit is additionally operable to, by the failure business unit and failure of the XPIC cancel functions of failure
The failure business unit of MIMO cancel functions open, and the failure business unit of the XPIC cancel functions of failure and failure
The failure business unit of MIMO cancel functions synchronizes recovery.
The present invention has the beneficial effect that：
By the present invention in that composition XPIC groups in the equipment of multiple-input multiple-output microwave transport equipment, equipment room composition MIMO groups,
Interfere or decay initiation business Transmission when, at preset timed intervals the period to failure business unit carry out active recovery, also
It is to say, the present invention can be all the way or in the case of the failure of a few road business unit, and the active for carrying out failure business unit restores,
To restore failure business after fault recovery normal transmission ability, so as to avoid in the prior art, certain is all the way or multi-channel service unit
It breaks down and leads to other not available problems of road business.
Description of the drawings
Fig. 1 is the operation principle schematic diagram of existing CCDP and XPIC；
Fig. 2 is the operation principle schematic diagram of existing MIMO；
Fig. 3 is the flow diagram of the method that microwave communication is carried out using XPIC and MIMO technology of the embodiment of the present invention；
Fig. 4 is the practical application scene schematic diagram of the MIMO+XPIC technologies of the present invention；
Fig. 5 be the present invention MIMO+XPIC networkings eat dishes without rice or wine a jump interference signal transmission schematic diagram；
Fig. 6 is that failure triggers losing lock flow chart under MIMO；
Fig. 7 is that MIMO+XPIC linkages restore flow chart；
Fig. 8 is the structure diagram of the device that microwave communication is carried out using XPIC and MIMO technology of the embodiment of the present invention.
Specific embodiment
In order to solve, certain is all the way in the prior art or multi-channel service unit breaks down and causes other road business unavailable
The problem of, the present invention provides a kind of application cross polarization interference canceler (Cross-polarisation Interference
Counteracter, XPIC) and MIMO technique (Multiple-Input Multiple-Output, MIMO) progress
The method and device of microwave communication, by the present invention in that composition XPIC groups, equipment in the equipment of multiple-input multiple-output microwave transport equipment
Between form MIMO groups, interfere or decay initiation business Transmission when, at preset timed intervals the period to failure business unit carry out
Actively restore, that is to say, that the present invention can be avoided all the way or in the case of the failure of a few road business unit to Ling Ji roads industry
Business unit interferes, and ensures the normal transmission of remaining link business unit, ensures transmission capacity to the maximum extent, and can be in event
Barrier restores failure business after restoring normal transmission ability, and so as to avoid, certain is all the way in the prior art or event occurs in multi-channel service unit
Hinder and lead to other not available problems of road business.Below in conjunction with attached drawing and embodiment, the present invention is carried out further detailed
Explanation.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, the present invention is not limited.
Embodiment of the method
An embodiment of the present invention provides a kind of methods of microwave communication, and referring to Fig. 3, this method includes：
S301, at least two multiple-input multiple-output microwave transport equipments of setting, in the equipment for making multiple-input multiple-output microwave transport equipment
Form XPIC groups, equipment room composition MIMO groups；
S302, in business Transmission, at preset timed intervals the period to failure business unit carry out active recovery, if industry
Business is successfully recovered, then is terminated, and is otherwise waited for subsequent time period and is continued to attempt to restore, until business recovery success；
The failure business unit is primary polarization direction business unit, the primary polarization direction business unit in space, secondary use
One or more of polarization direction business unit and space time polarization direction business unit.
That is, by the present invention in that XPIC groups, equipment room group are formed in the equipment of multiple-input multiple-output microwave transport equipment
Into MIMO groups, when interfering or decaying initiation business Transmission, the period is to the progress active of failure business unit at preset timed intervals
Restore, that is, the present invention can be all the way or in the case of the failure of a few road business unit, and the active for carrying out failure business unit is extensive
Multiple, to restore failure business after fault recovery normal transmission ability, so as to avoid in the prior art, certain is all the way or multi-channel service
Unit breaks down and leads to other not available problems of road business.
Fig. 4 is the practical application scene schematic diagram of the MIMO+XPIC technologies of the present invention, as shown in figure 4, the present invention uses two
A 2T2R (i.e. two hairs two are received) microwave transport equipment, the interior composition XPIC groups of equipment, equipment room composition MIMO groups form MIMO+
XPIC networkings.It is dual polarized antenna per surface antenna, two collection optical fiber distributing unit (Oracle Database is connected with combiner
Unloader, ODU) complete outdoor full outdoor unit (All Outdoor Unit, an AOU) equipment can also be connected, it can be with
Cross polarization isolation (Cross Polarization Isolation) XPI values are adjusted manually ensures the normal work of XPIC group links
Make.Two surface antennas of the same end show that a best distance forms MIMO groups by theoretical calculation formula, can adjust antenna
Distance adjust suitable ETA values and ensure that MIMO groups link works normally.
In MIMO+XPIC networkings, each channel of eating dishes without rice or wine all receives the component from four polarized signals in opposite end, is applying
When the method for MIMO+XPIC is transmitted, such as have been found that the veneer of (either two-way or three tunnels) business all the way breaks down
Or be deteriorated because weather reason receives signal, and in the case of causing reception abnormal and providing offseting signal without another three tunnel of normal direction,
It can lead to all not available situation of four tunnel business.
For the present invention by by four different tunnel business of polarization direction, being configured to four Logical Transmission Units, each transmission is single
The corresponding business all the way of member.Four polarization directions are called primary polarization direction business unit Primary, secondary polarization direction industry respectively
Cell S of being engaged in econdary, the primary polarization direction business unit Spatial Primary in space and space time polarization direction industry
Be engaged in cell S patial Secondary, based on hardware and physics realization, primary polarization direction business unit and secondary polarization direction
The primary polarization direction business unit of business unit and space and space time are XPIC signal interferences with polarization direction business unit
It offsets, the primary polarization direction business unit of primary polarization direction business unit and space.And secondary polarization direction business unit
Time with polarization direction business unit it is MIMO signal Interference Cancellation with space, includes mutually between them and independent mutually, Fig. 5
The transmission schematic diagram for the interference signal of a jump of eating dishes without rice or wine for MIMO+XPIC networkings.Assuming that primary polarization direction business unit detects
When current business breaks down, service transmitting unit can be automatically closed in primary polarization direction business unit, prevent its interference time from using
The normal work in the primary polarization direction business unit direction in polarization direction business unit direction and space, while secondary use polarization direction
The MIMO cancel functions in the primary polarization direction business unit direction of the XPIC cancel functions in business unit direction and space are closed, main
After closing service transmitting unit with polarization direction business unit, business can be opened according to the time series that special algorithm generates and sent
Unit is attempted to restore, if business recovery success Flow ends, if restoring unsuccessfully closing transmitting element waits for future time point
It continues to attempt to restore until business recovery success.
After setting up, each business unit has with properties：
Polarization properties：Polarization properties include four kinds of primary polarization direction business unit, secondary polarization direction business unit, sky
Between primary polarization direction business unit and space time use polarization direction business unit；
Partner's attribute：The location information of the transmission unit of partner's attribute another way business different for polarization direction, is used for
Communication between transmission unit, there are two types of partner's attributes for office of the present invention：XPIC partners attribute and MIMO partner's attributes；
Business health attribute：The business health attribute of the present invention includes health and unhealthy two states.
When it is implemented, when the failure business unit is one, the period at preset timed intervals is to failure business sheet
Member carries out active recovery, specifically includes：
Close the failure business unit, and close the failure business unit XPIC cancel functions business unit and
MIMO cancel function business unit；
According to the preset period of time that time series generating algorithm generates, opening failure service transmitting unit is timed extensive
It is multiple, until business recovery success.
Further, closing fault business unit of the present invention, specifically includes：When the business of the failure business unit
After continuing the first predetermined time of losing lock, the failure business unit is closed；
When it is implemented, the present invention is after the business of failure business unit continues losing lock 2 seconds, the failure business is closed
Unit.
The preset period of time generated according to time series generating algorithm is opened failure service transmitting unit and is determined
Shi Huifu is specifically included：
According to time series generating algorithm generate preset period of time, preset period of time then after, by failure industry
Radio frequency transmitting element where business unit opened for the second predetermined time, notified that partner's transmission unit of the failure business unit will
The out-of-lock detection time is adjusted to the third predetermined time, the second predetermined time then after, if partner's transmission unit is lock-out state,
Failure business recovery success, removes timer, if the second predetermined time then after, partner's transmission unit is out-of-lock condition
Failure business recovery fails, and closes the failure business unit, otherwise waits for after lower certain preset period of time arrives, continuing to attempt to
Restore, until business recovery success；
Wherein, the third predetermined time was more than for the second predetermined time；
For example, when the medium frequency reception unit where transmission unit detects that the road business continues losing lock 2s for a period of time
After (continuing for the first predetermined time always as out-of-lock condition, transmission unit thinks current business failure), it is single to close corresponding transmission
The radio frequency transmitting element of member.Time { the 10*1000,30*1000,60*1000,2*60* generated according to time series generating algorithm
1000,5*60*1000,12*60*1000,30*60*1000,72*60*1000,2*60*60* 1000 } start Timed Recovery.
It should be noted that restore wasted energy to save, one of the present invention it is gradually incremental when
Between sequence be timed recovery.
It attempts to open the radio frequency transmitting element 5s (the second predetermined time) where transmission unit after when being timed to, notifies partner
The out-of-lock detection time is adjusted to 10s with transmission unit and (continues the third predetermined time always for out-of-lock condition, transmission unit is thought
Current business failure), if then rear partner's transmission unit is lock-out state to 5s, failure business recovery successfully removes timer,
If then if rear partner's transmission unit is that out-of-lock condition failure business recovery fails to 5s, radio frequency transmitting element is closed, according to
Time series restarting timing waits for trial next time to restore, and opening radio frequency after transmission unit detects locking when opposite end sends list
Member.
When the failure business unit is the business unit of MIMO cancel functions, partner's transmission unit is another
The business unit of MIMO cancel functions, when the business unit that the failure business unit is XPIC cancel functions, the partner passes
Defeated unit is the business unit of another XPIC cancel function.
Further, the present invention is when business unit of the failure business unit for two MIMO cancel functions, by default
Time cycle carries out active recovery to failure business unit, specifically includes：
The failure business unit of MIMO cancel functions first to break down is closed, by the MIMO cancel functions of rear failure
Failure business unit open, and the MIMO cancel function business unit of closing fault business unit；Specifically, the present invention is real
It is in business unit of the failure business unit for two MIMO cancel functions to apply example, then closes the MIMO cancel functions of first failure
Business unit opens the business unit of the MIMO cancel functions of rear failure, meanwhile, closing fault business unit (failure industry
Business unit include above-mentioned two be assumed to be failure MIMO cancel functions failure business unit) MIMO cancel function business sheets
Member.Then, the preset period of time generated according to time series generating algorithm is timed recovery, opens the MIMO of failure
The failure business unit of cancel function is attempted actively to restore, if business recovery success, terminates, otherwise waits for future time week
Phase continues to attempt to restore, until business recovery success；
When business unit of the failure business unit for two XPIC cancel functions, the period is to failure business at preset timed intervals
Unit carries out active recovery, specifically includes：
The failure business unit of XPIC cancel functions first to break down is closed, by the XPIC cancel functions of rear failure
Failure business unit open, and the XPIC cancel function business unit of closing fault business unit；Specifically, the present invention is real
It is in business unit of the failure business unit for two XPIC cancel functions to apply example, then closes the XPIC cancel functions of first failure
Business unit opens the business unit of the MIMO cancel functions of rear failure, meanwhile, closing fault business unit (failure industry
Business unit include above-mentioned two be assumed to be failure XPIC cancel functions failure business unit) XPIC cancel function business sheets
Member.Then, the preset period of time generated according to time series generating algorithm is timed recovery, opens the XPIC of failure
The failure business unit of cancel function is attempted actively to restore, if business recovery success, terminates, otherwise waits for future time week
Phase continues to attempt to restore, until business recovery success.
When failure business unit is the business unit of XPIC cancel function and the business sheet of a MIMO cancel function
When first, at preset timed intervals the period to failure business unit carry out active recovery, specifically include：
The failure business sheet of the failure business unit of the XPIC cancel functions of closing fault and the MIMO cancel functions of failure
Member, and the XPIC cancel functions business unit of the failure business unit of the XPIC cancel functions of closing fault and failure
The MIMO cancel function business unit of the failure business unit of MIMO cancel functions；
The preset period of time generated according to time series generating algorithm is timed recovery, opens the XPIC of failure
The failure business unit of the failure business unit of cancel function and the MIMO cancel functions of failure is attempted actively to restore, if business
It is successfully recovered, then terminates, otherwise wait for subsequent time period and continue to attempt to restore, until business recovery success.
That is, MIMO groups main path signal and interference signal intensity are essentially the same, a direction failure can cause another
Direction is interrupted simultaneously substantially, in order to prevent influence of the direction failure to another direction, when a direction failure continues
Between first reach 2s after can first close PA, another direction would not close PA, while the MIMO cancel functions of both direction are closed
It closes, prevents from interfering with each other, as shown in Figure 6.
Specifically, when primary polarization direction business unit failure, the primary polarization direction business in space will necessarily be caused
Unit interrupts, so the present invention is used after primary polarization direction business unit trouble duration reached for the first predetermined time,
Primary polarization direction business unit is first closed, but the primary polarization direction business unit in space can be opened, while by primary polarization
Direction business unit and the MIMO cancel functions of the primary polarization direction business unit both direction in space are closed, and are prevented mutually relevant
It disturbs.
As an example it is assumed that losing lock occurs for primary polarization direction business unit direction failure, and then it is primary to cause space
The losing lock in polarization direction business unit direction when primary polarization direction business unit direction losing lock reaches 2s, can close PA
The interference to partner is prevented, when primary polarization direction business unit direction losing lock reaches 2s when space, finds primary polarization
Direction business unit direction has been switched off PA, then the PA of oneself is kept to be detected simultaneously by oneself with partner all in mistake to open
Lock status for the ease of restoring, MIMO cancel functions is closed, the interference signal for preventing partner from coming.
When it is implemented, opened described in the embodiment of the present invention XPIC cancel functions of failure failure business unit and
The failure business unit of the MIMO cancel functions of failure is attempted actively to restore, and specifically includes：
By the failure business unit of the XPIC cancel functions of failure and the failure business unit of the MIMO cancel functions of failure
It opens, and the failure business unit of the MIMO cancel functions of the failure business unit and failure of the XPIC cancel functions of failure carries out
It is synchronous to restore.
MIMO and XPIC exception flows are mutual indepedent, when some direction is broken down, MIMO module and XPIC module meetings
PA is closed simultaneously, and MIMO the and XPIC offseting signals of respective partner are closed, in order to ensure link energy after failure vanishes
Fast quick-recovery, MIMO and XPIC needs are carried out at the same time and actively restore, the mechanism that the present invention restores using linkage, when XPIC moulds
Block is done when actively restore, and MIMO module monitors XPIC modules and synchronizes recovery, and link is enable quickly to restore normal,
As shown in fig. 7, MIMO+XPIC linkages restore to include：
Assuming that as XPIC and MIMO, all in automatic mode and primary polarization direction business unit direction, losing lock has been very
After long a period of time, the fault recovery in primary polarization direction business unit direction at this time, and attempt to open PA；When XPIC modules are opened
When beginning to attempt to open PA, MIMO module linkage begins attempt to open PA, and secondary tasted with polarization direction business unit direction
Examination restores XPIC cancel functions, and the primary polarization direction business unit direction in space begins attempt to restore MIMO cancel functions, restore
Successful then flow terminates, if recovery is unsuccessful, XPIC modules continue to restore, and MIMO module continues linkage and restores.
It should be noted that each predetermined time of the present invention and time cycle can all be appointed according to actual needs
Meaning setting.
In the MIMO+XPIC technologies of the present invention, XPIC and MIMO mode can be respectively configured, and XPIC is forced in actual measurement
Faster resume speed can be reached under MIMO automatic modes, MIMO can realize synchronous recovery with XPIC.
For synthesis, the present invention can avoid making Ling Ji roads business all the way or in the case of the failure of a few road business
Into interference, ensure the normal transmission of remaining link traffic, ensure transmission capacity to the maximum extent, and can normally be passed in fault recovery
Restore failure business after Movement Capabilities.
Device embodiment
The embodiment of the present invention provides a kind of device of microwave communication, and referring to Fig. 8, which includes：Setting unit, setting is extremely
Few two multiple-input multiple-output microwave transport equipments make composition XPIC groups, equipment room group in the equipment of multiple-input multiple-output microwave transport equipment
Into MIMO groups；Recovery unit, in business Transmission, the period to be actively extensive to the progress of failure business unit at preset timed intervals
It is multiple, if business recovery success, terminates, otherwise wait for subsequent time period and continue to attempt to restore, until business recovery success；
The failure business unit is primary polarization direction business unit, the primary polarization direction business unit in space, secondary use
One or more of polarization direction business unit and space time polarization direction business unit.
That is, the present invention makes to form XPIC groups in the equipment of multiple-input multiple-output microwave transport equipment by setting unit,
Equipment room forms MIMO groups, when interfering or decaying initiation business Transmission, passes through recovery unit period pair at preset timed intervals
Failure business unit carries out active recovery, that is, the present invention can be carried out all the way or in the case of the failure of a few road business unit
The active of failure business unit restores, to restore failure business after fault recovery normal transmission ability, so as to avoid existing skill
Certain in art is all the way or multi-channel service unit breaks down and leads to other not available problems of road business.
For the present invention by by four different tunnel business of polarization direction, being configured to four Logical Transmission Units, each transmission is single
The corresponding business all the way of member.Four polarization directions are called primary polarization direction business unit Primary, secondary polarization direction industry respectively
Cell S of being engaged in econdary, the primary polarization direction business unit Spatial Primary in space and space time polarization direction industry
Be engaged in cell S patial Secondary, based on hardware and physics realization, primary polarization direction business unit and secondary polarization direction
The primary polarization direction business unit of business unit and space and space time are XPIC signal interferences with polarization direction business unit
It offsets, the primary polarization direction business unit of primary polarization direction business unit and space.And secondary polarization direction business unit
Time with polarization direction business unit it is MIMO signal Interference Cancellation with space, includes mutually between them and independent mutually, Fig. 5
The transmission schematic diagram for the interference signal of a jump of eating dishes without rice or wine for MIMO+XPIC networkings.Assuming that primary polarization direction business unit detects
When current business breaks down, service transmitting unit can be automatically closed in primary polarization direction business unit, prevent its interference time from using
The normal work in the primary polarization direction business unit direction in polarization direction business unit direction and space, while secondary use polarization direction
The MIMO cancel functions in the primary polarization direction business unit direction of the XPIC cancel functions in business unit direction and space are closed, main
After closing service transmitting unit with polarization direction business unit, business can be opened according to the time series that special algorithm generates and sent
Unit is attempted to restore, if business recovery success Flow ends, if restoring unsuccessfully closing transmitting element waits for future time point
It continues to attempt to restore until business recovery success.
After setting up, each business unit has with properties：
Polarization properties：Polarization properties include four kinds of primary polarization direction business unit, secondary polarization direction business unit, sky
Between primary polarization direction business unit and space time use polarization direction business unit；
Partner's attribute：The location information of the transmission unit of partner's attribute another way business different for polarization direction, is used for
Communication between transmission unit, there are two types of partner's attributes for office of the present invention：XPIC partners attribute and MIMO partner's attributes；
Business health attribute：The business health attribute of the present invention includes health and unhealthy two states.
Further, recovery unit of the present invention is additionally operable to, when the failure business unit is one, described in closing
Failure business unit, and close the XPIC cancel functions business unit of the failure business unit and MIMO cancel function business sheets
Member；According to the preset period of time that time series generating algorithm generates, open failure service transmitting unit and be timed recovery, directly
To business recovery success.
When it is implemented, recovery unit of the present invention is additionally operable to, when the business of the failure business unit continues losing lock
After first predetermined time, the failure business unit is closed；According to time series generating algorithm generate preset period of time,
Preset period of time then after, the radio frequency transmitting element where failure business unit was opened into for the second predetermined time, described in notice
The out-of-lock detection time is adjusted to the third predetermined time by partner's transmission unit of failure business unit, and the second predetermined time is then
Afterwards, if partner's transmission unit is lock-out state, timer is removed in the failure business recovery success, if the second pre- timing
Between then after, partner's transmission unit be out-of-lock condition failure business recovery failure, close the failure business unit, otherwise wait for
It after certain preset period of time arrives down, continues to attempt to restore, until business recovery success；Wherein, the third predetermined time is more than the
Two predetermined times；When the failure business unit is the business unit of MIMO cancel functions, partner's transmission unit is another
The business unit of one MIMO cancel function, as the business unit that the failure business unit is XPIC cancel functions, the partner
With the business unit that transmission unit is another XPIC cancel function.
For example, when the medium frequency reception unit where transmission unit detects that the road business continues losing lock 2s for a period of time
After (continuing for the first predetermined time always as out-of-lock condition, transmission unit thinks current business failure), it is single to close corresponding transmission
The radio frequency transmitting element of member.Time { the 10*1000,30*1000,60*1000,2*60* generated according to time series generating algorithm
1000,5*60*1000,12*60*1000,
30*60*1000,72*60*1000,2*60*60*1000 } start Timed Recovery.
It should be noted that restore wasted energy to save, one of the present invention it is gradually incremental when
Between sequence be timed recovery.
It attempts to open the radio frequency transmitting element 5s (the second predetermined time) where transmission unit after when being timed to, notifies partner
The out-of-lock detection time is adjusted to 10s with transmission unit and (continues the third predetermined time always for out-of-lock condition, transmission unit is thought
Current business failure), if then rear partner's transmission unit is lock-out state to 5s, failure business recovery successfully removes timer,
If then if rear partner's transmission unit is that out-of-lock condition failure business recovery fails to 5s, radio frequency transmitting element is closed, according to
Time series restarting timing waits for trial next time to restore, and opening radio frequency after transmission unit detects locking when opposite end sends list
Member.
Further, recovery unit of the present invention is additionally operable to, when failure business unit is two MIMO cancel functions
During business unit, the failure business unit of MIMO cancel functions first to break down is closed, the MIMO of rear failure is offset
The failure business unit of function is opened, and the MIMO cancel function business unit of closing fault business unit；According to time series
The preset period of time that generating algorithm generates is timed recovery, opens the failure business sheet of the MIMO cancel functions of failure
Member is attempted actively to restore, if business recovery success, terminates, otherwise waits for subsequent time period and continue to attempt to restore, until
Business recovery success；When business unit of the failure business unit for two XPIC cancel functions, close what is first broken down
The failure business unit of the XPIC cancel functions of rear failure is opened, and closed by the failure business unit of XPIC cancel functions
Close the XPIC cancel function business unit of failure business unit；According to time series generating algorithm generate preset period of time into
Row Timed Recovery, the failure business unit for opening the XPIC cancel functions of failure is attempted actively to restore, if business recovery
Success, then terminate, otherwise wait for subsequent time period and continue to attempt to restore, until business recovery success.When failure business unit
For XPIC cancel function business unit and MIMO cancel function business unit when, the XPIC of closing fault is offset
The failure business unit of the failure business unit of function and the MIMO cancel functions of failure, and the XPIC cancel functions of closing fault
Failure business unit XPIC cancel functions business unit and failure MIMO cancel functions failure business unit
MIMO cancel function business unit；The preset period of time generated according to time series generating algorithm is timed recovery, opens
The failure business unit of the failure business unit of the XPIC cancel functions of failure and the MIMO cancel functions of failure attempts master
It is dynamic to restore, if business recovery success, terminates, otherwise waits for subsequent time period and continue to attempt to restore, until business recovery
Success.
Further, recovery unit of the present invention is additionally operable to, by the failure business unit of the XPIC cancel functions of failure
It is opened with the failure business unit of the MIMO cancel functions of failure, and the failure business unit of the XPIC cancel functions of failure and event
The failure business unit of the MIMO cancel functions of barrier synchronizes recovery.
Related content in the embodiment of the present invention can refer to device embodiment and embodiment of the method part is understood, herein
It repeats no more.
The present invention can at least reach following advantageous effect：
By the present invention in that composition XPIC groups in the equipment of multiple-input multiple-output microwave transport equipment, equipment room composition MIMO groups,
Interfere or decay initiation business Transmission when, at preset timed intervals the period to failure business unit carry out active recovery, also
It is to say, the present invention can be all the way or in the case of the failure of a few road business unit, and the active for carrying out failure business unit restores,
To restore failure business after fault recovery normal transmission ability, so as to avoid in the prior art, certain is all the way or multi-channel service unit
It breaks down and leads to other not available problems of road business.
Although for example purpose, the preferred embodiment of the present invention is had been disclosed for, those skilled in the art will recognize
Various improvement, increase and substitution are also possible, and therefore, the scope of the present invention should be not limited to the above embodiments.
Claims (10)
- A kind of 1. method of microwave communication, which is characterized in that including：At least two multiple-input multiple-output microwave transport equipments are set, make composition XPIC in the equipment of multiple-input multiple-output microwave transport equipment Group, equipment room composition MIMO groups；In business Transmission, at preset timed intervals the period to failure business unit carry out active recovery, if business recovery into Work(then terminates, and otherwise waits for subsequent time period and continues to attempt to restore, until business recovery success；The failure business unit is primary polarization direction business unit, the primary polarization direction business unit in space, secondary polarization One or more of direction business unit and space time polarization direction business unit.
- 2. according to the method described in claim 1, it is characterized in that, when the failure business unit be one when, by it is default when Between the period to failure business unit carry out active recovery, specifically include：The failure business unit is closed, and closes the XPIC cancel functions business unit of the failure business unit and MIMO is supported Disappear function service unit；According to the preset period of time that time series generating algorithm generates, open failure service transmitting unit and be timed recovery, Until business recovery success.
- 3. according to the method described in claim 2, it is characterized in that,The closing fault business unit, specifically includes：When the business of the failure business unit continues the pre- timing of losing lock first Between after, close the failure business unit；The preset period of time generated according to time series generating algorithm, opening failure service transmitting unit are timed extensive It is multiple, it specifically includes：According to time series generating algorithm generate preset period of time, preset period of time then after, by failure business sheet Radio frequency transmitting element where first opened for the second predetermined time, notified partner's transmission unit of the failure business unit by losing lock Detection time is adjusted to the third predetermined time, the second predetermined time then after, it is described if partner's transmission unit is lock-out state Failure business recovery success, remove timer, if the second predetermined time then after, partner's transmission unit be out-of-lock condition failure Business recovery fails, and closes the failure business unit, otherwise waits for after lower certain preset period of time arrives, continuing to attempt to extensive It is multiple, until business recovery success；Wherein, the third predetermined time was more than for the second predetermined time；When the failure business unit is the business unit of MIMO cancel functions, partner's transmission unit is another MIMO The business unit of cancel function, when the business unit that the failure business unit is XPIC cancel functions, the partner is transmitted single Member is the business unit of another XPIC cancel function.
- 4. according to the method described in claim 1, it is characterized in that,When business unit of the failure business unit for two MIMO cancel functions, the period is to failure business unit at preset timed intervals Active recovery is carried out, is specifically included：The failure business unit of MIMO cancel functions first to break down is closed, by the event of the MIMO cancel functions of rear failure Hinder business unit to open, and the MIMO cancel function business unit of closing fault business unit；The preset period of time generated according to time series generating algorithm is timed recovery, and the MIMO for opening failure is offset The failure business unit of function is attempted actively to restore, if business recovery success, terminates, otherwise wait for subsequent time period after It is continuous to attempt to restore, until business recovery success；When business unit of the failure business unit for two XPIC cancel functions, the period is to failure business unit at preset timed intervals Active recovery is carried out, is specifically included：The failure business unit of XPIC cancel functions first to break down is closed, by the event of the XPIC cancel functions of rear failure Hinder business unit to open, and the XPIC cancel function business unit of closing fault business unit；The preset period of time generated according to time series generating algorithm is timed recovery, and the XPIC for opening failure is offset The failure business unit of function is attempted actively to restore, if business recovery success, terminates, otherwise wait for subsequent time period after It is continuous to attempt to restore, until business recovery success.When failure business unit for XPIC cancel function business unit and MIMO cancel function business unit when, The period carries out active recovery to failure business unit at preset timed intervals, specifically includes：The failure business unit of the failure business unit of the XPIC cancel functions of closing fault and the MIMO cancel functions of failure, and The XPIC cancel functions business unit of the failure business unit of the XPIC cancel functions of closing fault and the MIMO of failure are offset The MIMO cancel function business unit of the failure business unit of function；The preset period of time generated according to time series generating algorithm is timed recovery, and the XPIC for opening failure is offset The failure business unit of the failure business unit of function and the MIMO cancel functions of failure is attempted actively to restore, if business recovery Success, then terminate, otherwise wait for subsequent time period and continue to attempt to restore, until business recovery success.
- 5. the according to the method described in claim 4, it is characterized in that, failure for opening the XPIC cancel functions to break down The failure business unit of business unit and the MIMO cancel functions of failure is attempted actively to restore, and specifically includes：The failure business unit of the failure business unit of the XPIC cancel functions of failure and the MIMO cancel functions of failure is opened, And the failure business unit of the MIMO cancel functions of the failure business unit and failure of the XPIC cancel functions of failure synchronizes Restore.
- 6. a kind of device of microwave communication, which is characterized in that including：Setting unit sets at least two multiple-input multiple-output microwave transport equipments, in the equipment for making multiple-input multiple-output microwave transport equipment Form XPIC groups, equipment room composition MIMO groups；Recovery unit, in business Transmission, at preset timed intervals the period active recovery is carried out to failure business unit, such as The success of fruit business recovery, then terminate, otherwise wait for subsequent time period and continue to attempt to restore, until business recovery success；The failure business unit is primary polarization direction business unit, the primary polarization direction business unit in space, secondary polarization One or more of direction business unit and space time polarization direction business unit.
- 7. device according to claim 6, which is characterized in thatThe recovery unit is additionally operable to, and when the failure business unit is one, closes the failure business unit, and close The XPIC cancel functions business unit of the failure business unit and MIMO cancel function business unit；It is generated according to time series The preset period of time that algorithm generates opens failure service transmitting unit and is timed recovery, until business recovery success.
- 8. device according to claim 7, which is characterized in thatThe recovery unit is additionally operable to, and after the business of the failure business unit continues the first predetermined time of losing lock, closes institute State failure business unit；According to time series generating algorithm generate preset period of time, preset period of time then after, will Radio frequency transmitting element where failure business unit opened for the second predetermined time, and the partner of the failure business unit is notified to transmit The out-of-lock detection time is adjusted to the third predetermined time by unit, the second predetermined time then after, if partner's transmission unit is lock Determine state, timer is removed in the failure business recovery success, if the second predetermined time then after, partner's transmission unit is Out-of-lock condition failure business recovery fails, and closes the failure business unit, otherwise waits for after lower certain preset period of time arrives, It continues to attempt to restore, until business recovery success；Wherein, the third predetermined time was more than for the second predetermined time；When the failure industry When business unit is the business unit of MIMO cancel functions, partner's transmission unit is the business sheet of another MIMO cancel function Member, when the business unit that the failure business unit is XPIC cancel functions, partner's transmission unit is supported for another XPIC The business unit for the function that disappears.
- 9. according to the method described in claim 6, it is characterized in that,The recovery unit is additionally operable to, and when business unit of the failure business unit for two MIMO cancel functions, closing first goes out The failure business unit of the MIMO cancel functions of existing failure, the failure business unit of the MIMO cancel functions of rear failure is beaten It opens, and the MIMO cancel function business unit of closing fault business unit；According to time series generating algorithm generate it is default when Between the period be timed recovery, open failure MIMO cancel functions failure business unit attempt actively restore, if Business recovery success, then terminate, otherwise wait for subsequent time period and continue to attempt to restore, until business recovery success；Work as failure During business unit of the business unit for two XPIC cancel functions, the failure business of XPIC cancel functions first to break down is closed Unit is opened the failure business unit of the XPIC cancel functions of rear failure, and the XPIC of closing fault business unit is supported Disappear function service unit；The preset period of time generated according to time series generating algorithm is timed recovery, opens and event occurs The failure business unit of the XPIC cancel functions of barrier is attempted actively to restore, if business recovery success, terminates, otherwise wait for down A period of time continues to attempt to restore, until business recovery success.When industry of the failure business unit for an XPIC cancel function Be engaged in unit and MIMO cancel function business unit when, the failure business unit of the XPIC cancel functions of closing fault and therefore The failure business unit of the MIMO cancel functions of barrier, and the XPIC of the failure business unit of the XPIC cancel functions of closing fault is supported Disappear function service unit and the MIMO cancel functions of failure failure business unit MIMO cancel function business unit；It presses The preset period of time generated according to time series generating algorithm is timed recovery, opens the XPIC cancel functions of failure The failure business unit of failure business unit and the MIMO cancel functions of failure is attempted actively to restore, if business recovery success, Then terminate, otherwise wait for subsequent time period and continue to attempt to restore, until business recovery success.
- 10. device according to claim 9, which is characterized in thatThe recovery unit is additionally operable to, by the failure business unit of the XPIC cancel functions of failure and the MIMO cancel functions of failure Failure business unit open, and the event of the MIMO cancel functions of the failure business unit and failure of the XPIC cancel functions of failure Barrier business unit synchronizes recovery.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710001226.7A CN108270607B (en) | 2017-01-03 | 2017-01-03 | Microwave communication method and device |
| PCT/CN2017/112437 WO2018126811A1 (en) | 2017-01-03 | 2017-11-22 | Method and apparatus for microwave communication |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710001226.7A CN108270607B (en) | 2017-01-03 | 2017-01-03 | Microwave communication method and device |
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| CN108270607A true CN108270607A (en) | 2018-07-10 |
| CN108270607B CN108270607B (en) | 2022-10-21 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101800678A (en) * | 2010-03-12 | 2010-08-11 | 华为技术有限公司 | Microwave transmission method, device and system applying CCDP and XPIC |
| CN103378899A (en) * | 2012-04-25 | 2013-10-30 | 中兴通讯股份有限公司 | Control method and system by application of cross-polarization interference counteracter |
| US20140198867A1 (en) * | 2013-01-16 | 2014-07-17 | Broadcom Corporation | Communication System Having Cross Polarization Interference Cancellation (XPIC) |
| WO2016072206A1 (en) * | 2014-11-05 | 2016-05-12 | 日本電気株式会社 | Communication system, transmission apparatus, and communication method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004172975A (en) * | 2002-11-20 | 2004-06-17 | Nec Corp | Both polarized wave receiver, and local phase noise reduction method therefor |
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2017
- 2017-01-03 CN CN201710001226.7A patent/CN108270607B/en active Active
- 2017-11-22 WO PCT/CN2017/112437 patent/WO2018126811A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101800678A (en) * | 2010-03-12 | 2010-08-11 | 华为技术有限公司 | Microwave transmission method, device and system applying CCDP and XPIC |
| CN103378899A (en) * | 2012-04-25 | 2013-10-30 | 中兴通讯股份有限公司 | Control method and system by application of cross-polarization interference counteracter |
| US20140198867A1 (en) * | 2013-01-16 | 2014-07-17 | Broadcom Corporation | Communication System Having Cross Polarization Interference Cancellation (XPIC) |
| WO2016072206A1 (en) * | 2014-11-05 | 2016-05-12 | 日本電気株式会社 | Communication system, transmission apparatus, and communication method |
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| WO2018126811A1 (en) | 2018-07-12 |
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