CN106789803B - Data communications method, device and base station - Google Patents
Data communications method, device and base station Download PDFInfo
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- CN106789803B CN106789803B CN201610664828.6A CN201610664828A CN106789803B CN 106789803 B CN106789803 B CN 106789803B CN 201610664828 A CN201610664828 A CN 201610664828A CN 106789803 B CN106789803 B CN 106789803B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- 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
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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Abstract
A kind of data communications method, device and base station, data communications method include：The cascade quantity N of OFDM symbol is determined according to coverage area, receiver process performance and current sub-carrier interval, wherein N is positive integer；The length of the corresponding cyclic prefix in the current sub-carrier interval is determined according to the current sub-carrier interval and the cascade quantity N of the OFDM symbol；The cascade quantity N of the OFDM symbol and the length of the cyclic prefix are sent to the user terminal, so that including N number of OFDM symbol and single loop prefix when with the user terminal communication, in the OFDM sequences of use.Technical solution of the present invention improves data transmission efficiency.
Description
Technical field
The present invention relates to a kind of communications field more particularly to data communications method, device and base stations.
Background technology
In long term evolution (Long Term Evolution, LTE) system, each orthogonal frequency division multiplexing (Orthogonal
Frequency Division Multiplexing, OFDM) symbol include a cyclic prefix (Cyclic Prefix, CP).
By adding CP can be to avoid the interference between OFDM symbol, while it be dry to eliminate signal between the subcarrier in each OFDM symbol
It disturbs, to realize simple channel equalization operations.The selection of CP length often covers demand to be defined according to system.Existing
Long term evolution LTE network in, there are normal cyclic prefix (Normal Cyclic Prefix, NCP) and enhancing cyclic prefix
Two kinds of (Extended Cyclic Prefix, ECP).It needs to be supported with ECP when MPS process area is very big.
In the prior art, since subcarrier spacing is fixed as 15KHz, the length of OFDM symbol is also fixed.Therefore CP
The value of length be also relatively fixed, two kinds of values of only NCP and ECP.Wherein, the symbol sebolic addressing with NCP usually has 7
The CP length of OFDM symbol, the 1st OFDM symbol is 5.21 μ s, and the CP length of the 2nd to the 7th OFDM symbol is 4.69 μ s.Make
The protection of the anti-multipath within the scope of the delay spread of 1.4km may be implemented with the symbol sebolic addressing with NCP, be suitable for urban district, suburb
Area, rural area and radius of society are less than the mountain area environment of 5km.Symbol sebolic addressing with ECP is by there is 6 OFDM symbols, each
The CP length of OFDM symbol is 16.67 μ s.Symbol sebolic addressing with ECP can provide anti-within the scope of the delay spread of 10km
Multipath protective capability, the sea and desert for being suitable for mountain area environment of the coverage distance more than 5km and overlength distance being needed to cover
Equal environment.With the increase of network traffic types, for example, at the 5th third-generation mobile communication technology (fifth-generation, 5G)
In, for more flexible support multiple business, there is the ofdm system of a variety of different configurations (numerology).Difference configuration
Ofdm system subcarrier spacing it is different, therefore OFDM symbol length also can be different.
But in the case of being coexisted there are many subcarrier spacing in same subframe, due under different sub-carrier interval
The length of OFDM symbol is different, and the OFDM symbol under all subcarrier spacings uses the CP of equal length, then for length
The shorter OFDM symbol of degree, the time scale that CP is occupied is with regard to relatively high, and CP is not used to transmission data, therefore can increase
Pin is increased, efficiency of transmission is reduced.
Invention content
Present invention solves the technical problem that being how to improve data transmission efficiency.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of data communications method, data communications method includes：
The cascade quantity N of OFDM symbol is determined according to coverage area, receiver process performance and current sub-carrier interval,
Wherein, N is positive integer；The current son is determined according to the cascade quantity N of the current sub-carrier interval and the OFDM symbol
The length of the corresponding cyclic prefix in carrier wave interval；The length of the cascade quantity N of the OFDM symbol and the cyclic prefix is sent out
Send to user terminal so that when with the user terminal communication, in the OFDM sequences of use comprising N number of OFDM symbol and
Single loop prefix.
Optionally, described that the OFDM is determined according to coverage area, receiver process performance and current sub-carrier interval
The cascade quantity N of symbol includes：The cyclic prefix is determined according to the coverage area and the receiver process performance most
Small length；Calculate the multiple at the current sub-carrier interval and minimum subcarrier spacing；It is long according to the minimum of the cyclic prefix
Degree calculates the interval of the cascade quantity N of the OFDM symbol with the multiple；Described in being chosen in the interval
The value of the cascade quantity N of OFDM symbol.
Optionally, the interval of the cascade quantity N of the OFDM symbol is calculated using following formula：
Wherein, Tmin is the minimum length of the cyclic prefix, and M is the current sub-carrier interval
With the multiple of the minimum subcarrier spacing, T (cp, 0) is the length of the corresponding cyclic prefix of the minimum subcarrier spacing.
Optionally, determine that the length of the corresponding cyclic prefix in the current sub-carrier interval includes using following formula：
Wherein, Tcp is the length of the corresponding cyclic prefix in the current sub-carrier interval, and M is described
The multiple at current sub-carrier interval and minimum subcarrier spacing, before T (cp, 0) is the corresponding cycle of the minimum subcarrier spacing
The length sewed.
Optionally, the cyclic prefix is derived from first OFDM symbol that the OFDM sequences are arranged according to time sequencing
The end for the n-th OFDM symbol that end or the OFDM sequences are arranged according to time sequencing.
Optionally, it is derived from first OFDM symbol that the OFDM sequences are arranged according to time sequencing in the cyclic prefix
End when, the user terminal demodulates OFDM symbol one by one according to the waterfall sequence of the OFDM sequences.
Optionally, it when the user terminal demodulates OFDM symbol one by one, since second OFDM symbol, calculates previous
The interference that OFDM symbol forms previous OFDM symbol demodulates the previous OFDM symbol after eliminating the interference.
In order to solve the above technical problems, the embodiment of the invention also discloses a kind of data communication equipment, data communication equipment
Including：Quantity determination unit is cascaded, is suitable for being determined according to coverage area, receiver process performance and current sub-carrier interval
The cascade quantity N of OFDM symbol, wherein N is positive integer；Length determination unit, be suitable for according to the current sub-carrier interval with
The cascade quantity N of the OFDM symbol determines the length of the corresponding cyclic prefix in the current sub-carrier interval；Transmission unit is fitted
Be sent to the user terminal in by the cascade quantity N of the OFDM symbol and the length of the cyclic prefix so that with it is described
Include N number of OFDM symbol and single loop prefix when user terminal communication, in the OFDM sequences of use.
Optionally, the cascade quantity determination unit includes：Minimum length determination subelement is suitable for according to the covering model
Enclose the minimum length that the cyclic prefix is determined with the receiver process performance；Multiple determination subelement is suitable for described in calculating
The multiple at current sub-carrier interval and minimum subcarrier spacing；Section determination subelement is suitable for according to the cyclic prefix most
Small length calculates the interval of the cascade quantity N of the OFDM symbol with the multiple；Quantity determination subelement is cascaded, is suitable for
The value of the cascade quantity N of the OFDM symbol is chosen in the interval.
Optionally, the section determination subelement calculates taking for the cascade quantity N of the OFDM symbol using following formula
It is worth section：Wherein, Tmin is the minimum length of the cyclic prefix, and M is the current sub-carrier
The multiple at interval and the minimum subcarrier spacing, T (cp, 0) are the length of the corresponding cyclic prefix of the minimum subcarrier spacing
Degree.
Optionally, before the length determination unit determines the corresponding cycle in the current sub-carrier interval using following formula
The length sewed includes：Wherein, Tcp is the length of the corresponding cyclic prefix in the current sub-carrier interval
Degree, M are the multiple at the current sub-carrier interval and minimum subcarrier spacing, and T (cp, 0) is the minimum subcarrier spacing pair
The length for the cyclic prefix answered.
Optionally, the cyclic prefix is derived from first OFDM symbol that the OFDM sequences are arranged according to time sequencing
The end for the n-th OFDM symbol that end or the OFDM sequences are arranged according to time sequencing.
Optionally, it is derived from first OFDM symbol that the OFDM sequences are arranged according to time sequencing in the cyclic prefix
End when, the user terminal demodulates OFDM symbol one by one according to the waterfall sequence of the OFDM sequences.
Optionally, it when the user terminal demodulates OFDM symbol one by one, since second OFDM symbol, calculates previous
The interference that OFDM symbol forms previous OFDM symbol demodulates the previous OFDM symbol after eliminating the interference.
In order to solve the above technical problems, the embodiment of the invention also discloses a kind of base station, the base station includes the data
Communication device.
Compared with prior art, the technical solution of the embodiment of the present invention has the advantages that：
The embodiment of the present invention can determine OFDM according to coverage area, receiver process performance and current sub-carrier interval
The cascade quantity N of symbol, wherein N is positive integer；According to the cascade quantity at the current sub-carrier interval and the OFDM symbol
N determines the length of the corresponding cyclic prefix in the current sub-carrier interval；The cascade quantity N of the OFDM symbol is followed with described
The length of ring prefix is sent to the user terminal, so that including N when with the user terminal communication, in the OFDM sequences of use
A OFDM symbol and single loop prefix.It is determined based on coverage area, receiver process performance and current sub-carrier interval
The cascade quantity N of OFDM symbol, and N number of cascade OFDM symbol shares single loop prefix.Technical solution of the present invention is realized
The cascade quantity of OFDM symbol under different sub-carrier interval and the flexible selection of circulating prefix-length, and take into account covering
Complexity is handled with receiving；Meanwhile resource can be reduced by using above-mentioned OFDM sequences when with the user terminal communication
Expense improves efficiency of transmission.
Further, cyclic prefix is derived from the end for first OFDM symbol that the OFDM sequences are arranged according to time sequencing
The end for the n-th OFDM symbol that tail or the OFDM sequences are arranged according to time sequencing, is furthermore achieved cyclic prefix
Flexible selection.
Description of the drawings
Fig. 1 is a kind of flow chart of data communications method of the embodiment of the present invention；
Fig. 2 is a kind of schematic diagram of OFDM sequences of the embodiment of the present invention；
Fig. 3 is the schematic diagram of another kind OFDM sequences of the embodiment of the present invention；
Fig. 4 is a kind of schematic diagram of OFDM sequences in first embodiment of the invention；
Fig. 5 is a kind of schematic diagram of OFDM sequences in second embodiment of the invention；
Fig. 6 is a kind of schematic diagram of OFDM sequences in third embodiment of the invention；
Fig. 7 is a kind of structural schematic diagram of data communication equipment of the embodiment of the present invention.
Specific implementation mode
As described in the background art, in the case that the prior art coexists in same subframe there are many subcarrier spacing, by
The length of OFDM symbol under different sub-carrier interval is different, and the OFDM symbol under all subcarrier spacings uses identical
The CP of length, then for the shorter OFDM symbol of length, the time scale that CP is occupied is with regard to relatively high, and CP is to be not used to
Transmission data, therefore expense can be increased, reduce efficiency of transmission.
Inventor has carried out following analysis to the prior art, in LTE system, needs to be added before each ofdm symbol
Cyclic prefix.As long as the sum of the multidiameter delay of each diameter and timing error are no more than the length of CP, so that it may to ensure that receiver integrates
Integer waveform of each subcarrier for including in section under each diameter, to eliminate between the intersymbol interference and subcarrier that multipath is brought
Interference (Inter-Channel Interference, ICI).In general, the signal in cyclic prefix and OFDM symbol tail portion portion
Split-phase is same.In systems in practice, OFDM symbol is before being sent into channel, first has to that cyclic prefix is added, be then fed into channel into
Row transmission.
Currently, to ensure the compatibility at different sub-carrier interval, it is desirable that subcarrier spacing fsc follows following rule：Fsc=
F0 × M or fsc=f0 × 2m；Wherein, fsc is subcarrier spacing, and f0 is minimum subcarrier spacing, and M and m are positive integer.Accordingly
Ground, in order to ensure that the OFDM symbol length at different sub-carrier interval can be aligned, the length Tcp of cyclic prefix is also in compliance with following rule
Restrain Tcp=(Tcp, 0)/M or Tcp=(Tcp, 0)/2m；Wherein, Tcp is the length of the corresponding cyclic prefix of subcarrier spacing,
(Tcp, 0) is the length of the corresponding CP of minimum subcarrier spacing.
It should be noted that it will be understood by those skilled in the art that minimum subcarrier spacing is preset constant, such as can
To be 15KHz.Correspondingly, the length (Tcp, 0) of the corresponding cyclic prefix of minimum subcarrier spacing is also constant.
It is main to consider under different sub-carrier interval but in above-mentioned technical proposal in the length for determining cyclic prefix
The alignment of OFDM symbol.As subcarrier spacing increases, the length of CP shortens therewith.Since the length of CP is longer, symbol sebolic addressing
Acceptable multipath delay is bigger, and the propagation distance of signal is bigger.That is, the length of CP is longer, downlink covering
Range is bigger.Conversely, the shortening of the length of CP will influence the coverage area of cell, to reduce the space utilization of cellular cell
Rate increases density of building a station.
Technical solution of the present invention may be implemented to take into account covering and receive processing complexity；Meanwhile with the user terminal
Resource overhead can also be reduced when communication, improve efficiency of transmission.
To make the above purposes, features and advantages of the invention more obvious and understandable, below in conjunction with the accompanying drawings to the present invention
Specific embodiment be described in detail.
Fig. 1 is a kind of flow chart of data communications method of the embodiment of the present invention.
Data communications method shown in Fig. 1 can be used for base station side.The data communications method may comprise steps of：
Step S101：OFDM symbol is determined according to coverage area, receiver process performance and current sub-carrier interval
Cascade quantity N；
Step S102：It is determined according to the cascade quantity N at the current sub-carrier interval and the OFDM symbol described current
The length of the corresponding cyclic prefix of subcarrier spacing；
Step S103：The cascade quantity N of the OFDM symbol and the length of the cyclic prefix are sent to the user terminal.
In specific implementation, in order to realize multiple OFDM symbol common recycle prefixes without cyclic prefix, in step S101
The cascade quantity N of cascade OFDM symbol is wanted in middle determination, wherein N is positive integer.Cascade quantity N can according to coverage area, connect
Receipts machine process performance and current sub-carrier interval determine.
Specifically, step S101 may include：Institute is determined according to the coverage area and the receiver process performance
State the minimum length Tmin of cyclic prefix；Calculate the multiple M at the current sub-carrier interval and minimum subcarrier spacing；According to institute
State cyclic prefix minimum length Tmin and the multiple M calculate the OFDM symbol cascade quantity N interval；Institute
State the value for the cascade quantity N that the OFDM symbol is chosen in interval.
Wherein, coverage area can be that base station needs the range covered, be typically to predefine according to the design needs
Constant；Receiver process performance can be processing capacity of the user terminal receiver to data.For specific user terminal,
What its receiver performance was usually fixed.Specifically, receiver process performance is better, the cascade quantity N's of OFDM symbol takes
Value is bigger；Conversely, the value of the cascade quantity N of OFDM symbol is smaller.
Specifically, have an impact to the coverage area of cell due to the length of cyclic prefix, so determining cyclic prefix
When length, it can be determined according to the coverage area of cell.To ensure to cover, before the corresponding cycle in current sub-carrier interval
The length Tcp sewed needs to meet Tcp >=Tmin, wherein Tmin is the minimum length of cyclic prefix.That is, Tmin can be with
It is the length for the minimum cyclic prefix for meeting system ovelay range, which can be by MPS process area and wireless transmission ring
Border determines.For example, MPS process area is bigger, the length of cyclic prefix is longer；Wireless channel scattering environments are more complicated, before cycle
The length sewed is longer.
Specifically, as shown in Fig. 2, Fig. 2 is a kind of schematic diagram of OFDM sequences of the embodiment of the present invention.Per N number of OFDM symbol
A CP is mixed after cascade.In order to not influence the transmission using the same carrier wave at different sub-carrier interval to data, need to ensure
It can be with boundary alignment using the OFDM symbol at different sub-carrier interval.So, the length Tcp of the corresponding CP in current sub-carrier interval
Following formula need to be met：Wherein, (Tcp, 0) indicates the corresponding cyclic prefix of minimum subcarrier spacing f0
Length, M is the multiple of current sub-carrier interval fsc and minimum subcarrier spacing f0, i.e. fsc=f0 × M.
By upper, the length of the corresponding cyclic prefix in current sub-carrier interval meetsAnd Tcp >=
Tmin；Then there is N × (Tcp, 0)/M >=Tmin.It is hereby achieved that it is necessary to meet following condition by cascade quantity N：N≥M×Tmin/
(Tcp,0).Meanwhile the cascade quantity N of OFDM symbol is no more than maximum value M, that is to say, that at most M OFDM symbol cascade, with
Ensure that the boundary under different sub-carrier interval can be with the boundary alignment under minimum subcarrier spacing f0.
By upper, it may be determined that the interval of the cascade quantity N of OFDM symbol isIn the value
When choosing the value of the cascade quantity N of the OFDM symbol in section, complexity and coverage area can be handled according to receiver
To determine the cascade quantity N of OFDM symbol.Specifically, the value of cascade quantity N is bigger, coverage area is bigger, OFDM symbol
Demodulation it is more complicated.The cascade quantity of the OFDM symbol under different sub-carrier interval may be implemented in the embodiment of the present invention as a result,
Flexibly selection, and take into account coverage area and receive processing complexity.
It in step s 102, can be according to formula after determining the cascade quantity N of OFDM symbol
Calculate the length of the corresponding cyclic prefix in current sub-carrier interval.
It is arranged according to time sequencing specifically, the corresponding cyclic prefix in current sub-carrier interval is derived from the OFDM sequences
First OFDM symbol end or the end of n-th OFDM symbol that is arranged according to time sequencing of the OFDM sequences.
In step s 103, the length of the cascade quantity N of the OFDM symbol and the cyclic prefix is sent to user
Terminal, so that including N number of OFDM symbol and single loop when with the user terminal communication, in the OFDM sequences of use
Prefix.Specifically, user can be sent to the length of the cascade quantity N of OFDM symbol and the cyclic prefix by signaling
Terminal.Base station may be used OFDM sequences and send signal；User terminal may be used OFDM sequences according to the instruction of signaling and send
Upstream data or the reception demodulation for carrying out downlink data.
It is accorded with according to first OFDM that time sequencing arranges specifically, being derived from the OFDM sequences in the cyclic prefix
Number end when, the user terminal demodulates OFDM symbol one by one according to the waterfall sequence of the OFDM sequences.More specifically, institute
When stating user terminal and demodulating OFDM symbol one by one, since second OFDM symbol, previous OFDM symbol is calculated to current OFDM
The interference that symbol is formed demodulates the previous OFDM symbol after eliminating the interference.
It is understood that the mode for calculating interference can be arbitrary enforceable algorithm or method, the embodiment of the present invention
It is without limitation.
Specifically, when cyclic prefix is derived from the end for the n-th OFDM symbol that OFDM sequences are arranged according to time sequencing
When, then user terminal can carry out frequency domain list tap equalization to N number of OFDM symbol, carry out linear process and obtain demodulated signal.
More specifically, place's frequency domain list tap equalization can be the multiplication operation of frequency domain, by the way that N number of OFDM symbol is transformed to frequency-region signal
Afterwards, frequency-region signal is multiplied with equalizing coefficient.
It is understood that equalizing coefficient can be determined according to different application environments.
The embodiment of the present invention determines OFDM symbol based on coverage area, receiver process performance and current sub-carrier interval
Cascade quantity N, and N number of OFDM symbol shares single loop prefix.Technical solution of the present invention realizes between different sub-carrier
The cascade quantity of OFDM symbol under and the flexible selection of circulating prefix-length, and take into account covering and receive processing complexity
Between degree；Meanwhile resource overhead can be reduced by using above-mentioned OFDM sequences when with the user terminal communication, it improves and passes
Defeated efficiency.
Fig. 3 is the schematic diagram of another kind OFDM sequences of the embodiment of the present invention.
It can be with boundary alignment using the OFDM sequences at different sub-carrier interval in the embodiment of the present invention.
As shown in figure 3, being divided into 2f0 between current sub-carrier, when cascade quantity N is 1, current sub-carrier interval 2f0 is corresponding
Length Tcp2=1/2 × T (cp, 0) of cyclic prefix.3f0 is divided between current sub-carrier, when cascade quantity N is 3, current son carries
Length Tcp3=3/3 × T (cp, 0)=T (cp, 0) of the corresponding cyclic prefix of wave spacing 3f0.That is, current sub-carrier
Between when being divided into 2f0,1 OFDM symbol and the cyclic prefix that length is Tcp2=1/2 × T (cp, 0) form an OFDM sequence；
When being divided into 3f0 between current sub-carrier, 3 OFDM symbols and the cyclic prefix that length is Tcp3=T (cp, 0) form an OFDM
Sequence.
As a result, in data transmission, the OFDM sequences that 2 sub- intercarriers are divided into 2f0 can be divided into 1 sub- intercarrier
The OFDM sequences of 3f0 can reach the boundary alignment of OFDM sequences.
Fig. 4 is a kind of schematic diagram of OFDM sequences in real first embodiment of the invention.
In the present embodiment, when the cell coverage area under the subcarrier spacing of system requirements all length is identical, OFDM at this time
The cascade quantity N of symbol can be determined as the multiple M at current sub-carrier interval and minimum subcarrier spacing.So, according to formulaIt can determine the length of the corresponding cyclic prefix of the subcarrier spacing of all length
As shown in figure 4, when being divided into 2f0 between current sub-carrier, the multiple M at current sub-carrier interval and minimum subcarrier spacing
It is 2, at this point, cascade quantity N is 2, the length of the corresponding cyclic prefix of current sub-carrier interval 2f0
When being divided into 3f0 between current sub-carrier, current sub-carrier interval with most
The multiple M of small subcarrier spacing is 3, at this point, cascade quantity N is 3, the length of the corresponding cyclic prefix of current sub-carrier interval 3f0
Spend Tcp3=3/3 × T (cp, 0)=T (cp, 0).When being divided into 4f0 between current sub-carrier, current sub-carrier interval is carried with most boy
The multiple M of wave spacing is 4, at this point, cascade quantity N is 4, the length of the corresponding cyclic prefix of current sub-carrier interval 4f0The length of the corresponding cyclic prefix in current sub-carrier interval of other length can
With and so on, details are not described herein again.
Fig. 5 is a kind of schematic diagram of OFDM sequences in real second embodiment of the invention.
In the present embodiment, for current sub-carrier interval fsc=f0 × 2mApplication scenarios, it is desirable that between different subcarriers
It is identical every the cascade quantity of the OFDM symbol of (in addition to minimum subcarrier spacing f0).That is, needing identical quantity
OFDM symbol mutually cascades.
As shown in figure 5, when being divided into 2f0 by taking N=2 as an example, between current sub-carrier, current sub-carrier interval and minimum subcarrier
The multiple M at interval is 2, the length of the corresponding cyclic prefix of current sub-carrier interval 2f0
When being divided into 4f0 between current sub-carrier, the multiple M of current sub-carrier interval and minimum subcarrier spacing is 4, current sub-carrier interval
Length Tcp4=2/4 × T (cp, 0)=1/2 × T (cp, 0) of the corresponding cyclic prefix of 4f0.8f0 is divided between current sub-carrier
When, the multiple M of current sub-carrier interval and minimum subcarrier spacing is 8, the corresponding cyclic prefix of current sub-carrier interval 8f0
LengthThe corresponding cycle in current sub-carrier interval of other length
The length of prefix can with and so on, details are not described herein again.
Compared with each OFDM symbol in the prior art adds a CP, before technical solution of the present invention can make single loop
The length increase sewed, so as to expand the coverage area of cell.
Fig. 6 is a kind of schematic diagram of OFDM sequences in real 3rd embodiment of the invention.
As shown in fig. 6, in the present embodiment, according to covering demand, the length of the cyclic prefix under different sub-carrier interval is not
1/2 of CP length when can be less than minimum subcarrier spacing f0, that is to say, that the length Tcp satisfaction of cyclic prefix, Tcp >=1/2
×T(cp,0)。
To meet covering demand, the OFDM sequences under different sub-carrier interval are as shown in Figure 6.It is divided between current sub-carrier
When 2f0, cascade quantity N is 1, length Tcp2=1/2 × T (cp, 0) of the corresponding cyclic prefix of current sub-carrier interval 2f0.When
When preceding subcarrier spacing is 3f0, cascade quantity N is 3, the length Tcp3=of the corresponding cyclic prefix of current sub-carrier interval 3f0
3/3 × T (cp, 0)=T (cp, 0).When being divided into 4f0 between current sub-carrier, cascade quantity N is 2,4f0 pairs of current sub-carrier interval
Length Tcp4=2/4 × T (cp, the 0)=1/2 × T (cp, 0) for the cyclic prefix answered.That is, being divided between current sub-carrier
When 2f0,1 OFDM symbol and the cyclic prefix that length is Tcp2=1/2 × T (cp, 0) form an OFDM sequence；Current son
When intercarrier is divided into 3f0,3 OFDM symbols and the cyclic prefix that length is Tcp3=T (cp, 0) form an OFDM sequence；When
When preceding subcarrier spacing is 4f0,2 OFDM symbols and the cyclic prefix that length is Tcp4=1/2 × T (cp, 0) form one
OFDM sequences.
Fig. 7 is a kind of structural schematic diagram of data communication equipment of the embodiment of the present invention.
As shown in fig. 7, data communication equipment 70 can be used for base station side.Data communication equipment 70 may include：Cascade number
Measure determination unit 701, length determination unit 702 and transmission unit 703.
Wherein, cascade quantity determination unit 701 is suitable for according to coverage area, receiver process performance and current sub-carrier
Interval determines the cascade quantity N of OFDM symbol, wherein N is positive integer；
Length determination unit 702 is suitable for true according to the current sub-carrier interval and the cascade quantity N of the OFDM symbol
Determine the length of the corresponding cyclic prefix in the current sub-carrier interval；
Transmission unit 703 is suitable for the length of the cascade quantity N of the OFDM symbol and the cyclic prefix being sent to use
Family terminal is followed comprising N number of OFDM symbol and individually so that when with the user terminal communication, in the OFDM sequences of use
Ring prefix.
In specific implementation, cascade quantity determination unit 701 may include：Minimum length determination subelement (not shown), times
Number determination subelement (not shown), section determination subelement (not shown) and cascade quantity determination subelement (not shown).
Wherein, minimum length determination subelement is suitable for determining institute according to the coverage area and the receiver process performance
State the minimum length of cyclic prefix；
Multiple determination subelement is suitable for calculating the multiple at the current sub-carrier interval and minimum subcarrier spacing；
Section determination subelement is suitable for calculating the OFDM symbols with the multiple according to the minimum length of the cyclic prefix
Number cascade quantity N interval；
Cascade quantity determination subelement is suitable for choosing taking for the cascade quantity N of the OFDM symbol in the interval
Value.
Specifically, section determination subelement, which may be used following formula and calculate the cascade quantity N of the OFDM symbol, takes
It is worth section：Wherein, Tmin is the minimum length of the cyclic prefix, and M is between the current sub-carrier
Every the multiple with the minimum subcarrier spacing, T (cp, 0) is the length of the corresponding cyclic prefix of the minimum subcarrier spacing.
Specifically, length determination unit 702, which may be used following formula and determine that the current sub-carrier interval is corresponding, follows
The length of ring prefix：Wherein, Tcp is the length of the corresponding cyclic prefix in the current sub-carrier interval
Degree, M are the multiple at the current sub-carrier interval and minimum subcarrier spacing, and T (cp, 0) is the minimum subcarrier spacing pair
The length for the cyclic prefix answered.
The specific implementation mode of the embodiment of the present invention can refer to the embodiment of aforementioned data communication means, no longer superfluous herein
It states.
The embodiment of the invention also discloses a kind of base station, the base station may include data communication equipment 70 shown in Fig. 7.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is can
It is completed with instructing relevant hardware by program, which can be stored in computer readable storage medium, to store
Medium may include：ROM, RAM, disk or CD etc..
Although present disclosure is as above, present invention is not limited to this.Any those skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (11)
1. a kind of data communications method, which is characterized in that including：
The cascade quantity N of OFDM symbol is determined according to coverage area, receiver process performance and current sub-carrier interval,
In, N is positive integer；
Determine that the current sub-carrier interval is corresponding with the cascade quantity N of the OFDM symbol according to the current sub-carrier interval
Cyclic prefix length；
The cascade quantity N of the OFDM symbol and the length of the cyclic prefix are sent to the user terminal so that with institute
Include N number of OFDM symbol and single loop prefix when stating user terminal communication, in the OFDM sequences of use；
The cascade number that the OFDM symbol is determined according to coverage area, receiver process performance and current sub-carrier interval
Measuring N includes：
The minimum length of the cyclic prefix is determined according to the coverage area and the receiver process performance；
Calculate the multiple at the current sub-carrier interval and minimum subcarrier spacing；
The value area of the cascade quantity N of the OFDM symbol is calculated according to the minimum length of the cyclic prefix and the multiple
Between；
The value of the cascade quantity N of the OFDM symbol is chosen in the interval；
The length of the corresponding cyclic prefix in the current sub-carrier interval is determined using following formula：
Wherein, Tcp is the length of the corresponding cyclic prefix in the current sub-carrier interval, and M is described works as
The multiple of preceding subcarrier spacing and minimum subcarrier spacing, T (cp, 0) are the corresponding cyclic prefix of the minimum subcarrier spacing
Length.
2. data communications method according to claim 1, which is characterized in that calculate the OFDM symbol using following formula
Cascade quantity N interval：
Wherein, Tmin is the minimum length of the cyclic prefix, and M is the current sub-carrier interval
With the multiple of the minimum subcarrier spacing, T (cp, 0) is the length of the corresponding cyclic prefix of the minimum subcarrier spacing.
3. data communications method according to claim 1, which is characterized in that the cyclic prefix is derived from the OFDM sequences
The N arranged according to time sequencing according to the end or the OFDM sequences of first OFDM symbol of time sequencing arrangement
The end of a OFDM symbol.
4. data communications method according to claim 3, which is characterized in that be derived from the OFDM sequences in the cyclic prefix
When the end for first OFDM symbol that Leie is arranged according to time sequencing, the user terminal according to the OFDM sequences cascade
Sequence demodulates OFDM symbol one by one.
5. data communications method according to claim 4, which is characterized in that the user terminal demodulates OFDM symbol one by one
When, since second OFDM symbol, the interference that previous OFDM symbol forms previous OFDM symbol is calculated, by the interference
After elimination, the previous OFDM symbol is demodulated.
6. a kind of data communication equipment, which is characterized in that including：
Quantity determination unit is cascaded, is suitable for being determined according to coverage area, receiver process performance and current sub-carrier interval
The cascade quantity N of OFDM symbol, wherein N is positive integer；
Length determination unit is suitable for described in the cascade quantity N determinations according to the current sub-carrier interval and the OFDM symbol
The length of the corresponding cyclic prefix in current sub-carrier interval；
Transmission unit, suitable for the cascade quantity N of the OFDM symbol and the length of the cyclic prefix are sent to the user terminal,
So that including N number of OFDM symbol and single loop prefix when with the user terminal communication, in the OFDM sequences of use；
The cascade quantity determination unit includes：
Minimum length determination subelement, before determining the cycle according to the coverage area and the receiver process performance
The minimum length sewed；
Multiple determination subelement is suitable for calculating the multiple at the current sub-carrier interval and minimum subcarrier spacing；Section determines
Subelement, suitable for calculating according to the minimum length of the cyclic prefix and the multiple cascade quantity N of the OFDM symbol
Interval；
Cascade quantity determination subelement, the value of the cascade quantity N suitable for choosing the OFDM symbol in the interval；
The length determination unit determines the length of the corresponding cyclic prefix in the current sub-carrier interval using following formula：
Wherein, Tcp is the length of the corresponding cyclic prefix in the current sub-carrier interval, and M is described works as
The multiple of preceding subcarrier spacing and minimum subcarrier spacing, T (cp, 0) are the corresponding cyclic prefix of the minimum subcarrier spacing
Length.
7. data communication equipment according to claim 6, which is characterized in that the section determination subelement uses following public affairs
Formula calculates the interval of the cascade quantity N of the OFDM symbol：
Wherein, Tmin is the minimum length of the cyclic prefix, and M is the current sub-carrier interval
With the multiple of the minimum subcarrier spacing, T (cp, 0) is the length of the corresponding cyclic prefix of the minimum subcarrier spacing.
8. data communication equipment according to claim 6, which is characterized in that the cyclic prefix is derived from the OFDM sequences
The N arranged according to time sequencing according to the end or the OFDM sequences of first OFDM symbol of time sequencing arrangement
The end of a OFDM symbol.
9. data communication equipment according to claim 8, which is characterized in that be derived from the OFDM sequences in the cyclic prefix
When the end for first OFDM symbol that Leie is arranged according to time sequencing, the user terminal according to the OFDM sequences cascade
Sequence demodulates OFDM symbol one by one.
10. data communication equipment according to claim 9, which is characterized in that the user terminal demodulates OFDM symbols one by one
Number when, since second OFDM symbol, calculate the interference that previous OFDM symbol forms previous OFDM symbol, will be described dry
After disturbing elimination, the previous OFDM symbol is demodulated.
11. a kind of base station, which is characterized in that including such as claim 6 to 10 any one of them data communication equipment.
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| CN113660186B (en) * | 2020-05-12 | 2023-05-05 | 中国移动通信有限公司研究院 | Signal generation method, signal receiving method, device and network equipment |
| CN115189992B (en) * | 2021-04-02 | 2024-05-10 | 大唐移动通信设备有限公司 | Data processing method, device, network equipment and terminal equipment |
| WO2022206376A1 (en) * | 2021-04-02 | 2022-10-06 | 大唐移动通信设备有限公司 | Data processing method and apparatus, and network device and terminal device |
| CN115913863A (en) * | 2022-12-02 | 2023-04-04 | 深圳市汇川技术股份有限公司 | Method, device, terminal and medium for acquiring OFDM waveform parameter set |
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| CN102739594A (en) * | 2011-04-12 | 2012-10-17 | 中兴通讯股份有限公司 | Radio frame parameter configuration and signal transmission method and apparatus thereof |
| CN102857462A (en) * | 2011-07-01 | 2013-01-02 | 电信科学技术研究院 | Method and device for transmitting data |
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| CN102739594A (en) * | 2011-04-12 | 2012-10-17 | 中兴通讯股份有限公司 | Radio frame parameter configuration and signal transmission method and apparatus thereof |
| CN102857462A (en) * | 2011-07-01 | 2013-01-02 | 电信科学技术研究院 | Method and device for transmitting data |
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