CN108900459A - GFDM/CDMA mixing multiple access radio switch-in method - Google Patents
GFDM/CDMA mixing multiple access radio switch-in method Download PDFInfo
- Publication number
- CN108900459A CN108900459A CN201810516418.6A CN201810516418A CN108900459A CN 108900459 A CN108900459 A CN 108900459A CN 201810516418 A CN201810516418 A CN 201810516418A CN 108900459 A CN108900459 A CN 108900459A
- Authority
- CN
- China
- Prior art keywords
- gfdm
- user
- sub
- cdma
- data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002156 mixing Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000001228 spectrum Methods 0.000 claims abstract description 54
- 239000000969 carrier Substances 0.000 claims abstract description 19
- 230000000631 nonopiate Effects 0.000 claims abstract description 6
- 230000009977 dual effect Effects 0.000 claims abstract description 5
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims description 24
- 238000004891 communication Methods 0.000 claims description 15
- 238000013468 resource allocation Methods 0.000 claims description 7
- 238000012790 confirmation Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 239000012141 concentrate Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000010295 mobile communication Methods 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 23
- 230000008901 benefit Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 241000283014 Dama Species 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- JNSGIVNNHKGGRU-JYRVWZFOSA-N diethoxyphosphinothioyl (2z)-2-(2-amino-1,3-thiazol-4-yl)-2-methoxyiminoacetate Chemical compound CCOP(=S)(OCC)OC(=O)C(=N/OC)\C1=CSC(N)=N1 JNSGIVNNHKGGRU-JYRVWZFOSA-N 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/0022—PN, e.g. Kronecker
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a kind of GFDM/CDMA mixing multiple access radio switch-in methods, and the inter-sub-carrier interference of GFDM can be cleared up using the present invention.The technical scheme is that：The present invention is directed to the user using adjacent sub-carrier, interference is had to each other, the problem of being difficult to realize, in the wireless access system of multicarrier transmitter broad sense frequency division multiplexing GFDM/ CDMA CDMA mixing multiple access, introduce spread spectrum slotted ALOHA, after user completes to base station Time and Frequency Synchronization, each user sends the upstream data for reaching that the base station moment is each time slot initial time at random；Use sub-carrier number for K, each subcarrier can carry the broad sense frequency division multiplexing GFDM system sub-carrier that symbolic number is M and be numbered；When user sends data, PN sequence is added between adjacent sub-carrier and is spread, i.e., the same PN1 is used to odd number sub-carriers, dual numbers sub-carriers use the same PN2, offset the interference between nonopiate subcarrier with this.
Description
Technical field
The present invention relates to one kind to be based on broad sense frequency division multiplexing GFDM (Generalized Frequency Division
Multiplexing wireless communication multiple access technology field) especially combines broad sense frequency division multiplexing multiple access and spread spectrum time slot
The mixing multiple access technology of Aloha.
Background technique
In recent years, super broad band radio communication system generallys use duration extremely short impulse waveform to the data transmitted
It is modulated, modulation bandwidth is extended on several GHz magnitudes, so that system be made to have low in energy consumption, message transmission rate pole
Height, a series of advantage for uniquenesses such as anti-multipath and narrowband interference performance are strong, and user capacity is big.In multi-user system, receiver
Other than by ambient noise interference, also by the interference of other transmitting users.Interference due to other transmitting users to receiver
The phase of pulse, time delay etc. is all random, so the interference that the output that calculate pulse pair receiver generates.With satellite
The continuous renewal of the communication technology and being increasing for type of service, the prior art propose fixed slot assignment protocol (FAMA),
On-demand request distributorship agreement (DAMA), random access protocol (RA), free access protocol (FA) and CDMA slotted ALOHA agreement etc. are a variety of
The fundamental type of multiple access protocol.Mainly there is distribution according to need at present and freely distributes the CFDAMA agreement combined, fixed point
Match and the CRDAMA agreement and other that CFDAMA agreement, random access and the distribution according to need combined combines of distributing according to need
The hybrid protocol of type.CDMA slotted ALOHA is also applied in satellite communication and radio digital communication net.ALOHA agreement is divided into pure
ALOHA and two kinds of CDMA slotted ALOHA.The thought of ALOHA agreement is very simple, as long as user has data to send, although allowing them
It sends.Certainly, conflict can be generated in this way to cause the destruction of frame.In slotted ALOHA system, computer is not in user
Data are just sent immediately after pressing enter key, but just to be sent until next timeslice starts.In this way, continuous pure
ALOHA reforms into discrete CDMA slotted ALOHA.Since the impact zone of conflict is averagely reduced to the half of pure ALOHA, time slot
The channel utilization of ALOHA can achieve 36.8% (1/e), be twice of pure ALOHA agreement.But it for CDMA slotted ALOHA, uses
The average transmission time of user data is higher than pure ALOHA system.A variety of multiplex protocols be exactly a system many users it
Between share a common channel, this agreement must be controlled by requiring user to follow a determining principle user access
The mode of channel, this agreement want the distribution capability of control channel.User transmits communication method and is called agreement, is distinguished with channel
Communication object, a channel only accommodates a user and converses, and the user of many calls simultaneously comes area mutually with channel
Point, here it is multiple access.It is accessed when multiple users are called multiple access with a common medium transmission.Therefore multiple access protocol is exactly
One is used to be used in conjunction with the principle for being delivered successfully information between the user of the same transmission medium, when resource is exceeded one solely
Vertical user using when just need multiple access protocol.If without this agreement, when multiple user's access transport resources are same
One time will collide, therefore multiple access protocol will at least solve these collision problems.Multiple access protocol technology
Effect is that the terminal in the same network is made to share the same transfer resource.Multiple access protocol is used in shared channel resources
In Transmission system, in this case, the main reason for shared resource is the connectivity of system environments, is wanted in wireless transmitting system
There is efficient resource utilization, when multiple users are used in conjunction with a transmission medium, there are many point-to-point for this transmission network
Link composition.When one of link is used by multiple users simultaneously, it is necessary to which frequency multiplexing technique, frequency multiplexing technique are exactly not
Same transmission information uses the same physical link.It is connect when establishing multiple access distinguishing channel to transmit the carrier frequency difference of signal
It is fashionable, referred to as Frequency Division Multiple Access (FDMA)；It distinguishes channel when to transmit time difference existing for signal and establishes multiple access access
When, referred to as time division multiple access way (TDMA)；When establishing multiple access access to transmit the pattern difference of signal to distinguish channel, referred to as
CDMA mode (CDMA).The multi-access mode applied in mobile communications at present has：Frequency division multiple access FDMA, time division multiple acess
TDMA, CDMA CDMA and their mixing application mode etc..The connection for establishing the wireless channel between user is multiple access
The problem of access way.Solve the problems, such as the method for multiple access access multiple access technique.Multiple access technique is satellite communication
One of key technology has important influence to the user capacity of system, complexity, economy etc..The choosing of multiple access protocol
Take the availability of frequency spectrum, power system capacity, network structure, the service quality of communication, the complexity of equipment of the system of directly influencing.It passes
The multiple access technology of system quadrature divide principle signal-based realizes the service signal separation of multi-user, as the time-division, frequency division, code point,
Space division etc., wherein frequency division multiple access technology maturation, stabilization, easy to accomplish and cost is relatively low, but its availability of frequency spectrum is lower, each
User's (remote station) will occupy certain guard band.Time division multiple acess is to be divided into periodic frame the time, each frame
Be sub-partitioned into several time slots to base station send signal, meet timing with it is synchronous under conditions of, base station can be respectively when each
The signal that each mobile terminal is received in gap is disturbed without mixed.TDMA has communication signal quality good compared with FDMA, and secrecy preferably, is
The advantages that system capacity is big, and the availability of frequency spectrum is high, is widely adopted in broadband wireless access field.Code Division Multiple Access is to difference
User distribute a different coded sequence to share same channel, use different codings to distinguish different users.In reality
In the environment of border, due to various multiple access technology functional limitations, often a variety of multiple access technologies are used in mixed way.
PN synchronization is the precondition that spread spectrum communication system works normally, and acquiring pseudo code is the premise of PN synchronization
Condition.In order to realize the concealment of communication system, it will usually by the way of mixing multiple access, such as frequency division multiple access (FDMA), when
Divide the mixing multi-access mode of multiple access (TDMA) and CDMA (CDMA).Under this multi-access mode, call duration time is extremely short, initial
Frequency difference is larger, dynamic range of signals is big, carrier-to-noise ratio is low, and may be accompanied by high reject signal.Currently, mixing multiple access technology
Have：MF-TDMA, TD-CDMA etc., these belong to the scope of single carrier orthogonal multiple access technology, single carrier orthogonal multiple access technology, often
A user only uses a carrier wave in synchronization, and spectrum utilization efficiency is lower.For this problem of the availability of frequency spectrum, existing skill
Art proposes some solution routes, such as uses multi-carrier orthogonal multiple access technology, the orthogonal multiple access scheme of multicarrier system.It can see
Do the combination of orthogonal/quasi- orthogonal multiple access scheme in multi-carrier modulation symbol and time, frequency, code domain, the orthogonal multiple access of multicarrier system
Opposite single carrier system, spectrum efficiency improve a lot, and can greatly improve the service rate of user.However OFDM multicarrier skill
Art due to its out-of-band radiation is big, papr is higher and to frequency deviation it is very sensitive the features such as, make it in some applications
Applicability is not strong under scene.When the same time slot of different user's random access, as long as they do not utilize identical subcarrier,
System remains to distinguish different users, but here the problem is that use is adjacent if user has chosen adjacent subcarrier
The user of subcarrier has interference, it is difficult to realize to each other.Adjacent subcarrier is chosen for the above user, then to each other
The shortcomings that having interference d, industry proposes improvement skill of broad sense frequency division multiplexing (GFDM) technology as orthogonal frequency division multiplex OFDM
Art.Broad sense frequency division multiplexing GFDM is that a kind of availability of frequency spectrum is high, sends and receives fairly simple, out-of-band power leakage very little, respectively
It, can be with the multi-carrier transmission waveform scheme of flexible modulation without synchronizing between subband.Most of research concentrates on GFDM wave at present
Shape realizes the directions such as self-interference inhibition.Although GFDM can be by Data expansion at time-frequency two-dimensional block structure, each piece comprising multiple
Subcarrier and subsymbol, according to different transmitting scenes, the quantity of subcarrier and subsymbol flexibly be can configure, but by this multicarrier
There is also certain difficulty in conjunction with time, frequency, code domain mixing multiple access technology for technology.From Fig. 3 it is apparent that in receiving end
Each subcarrier will receive the interference of two neighboring subcarrier, just because of the presence of self-interference between nonopiate subcarrier, connect
Receiving end needs that preferable bit error rate performance could be obtained using the very high receiving algorithm of complexity.
The present invention is that purpose is in view of the problems of the existing technology, on the basis of GFDM, to be carried out using CDMA slotted ALOHA
The system of random access, the method for extending neighboring carrier spectrum improve GFDM inter-sub-carrier interference, propose that one kind can be improved
Spectrum efficiency and the mixing multiple access technology for increasing power system capacity.
Summary of the invention
Technical problems to be solved by the invention purpose is, provides one kind and can be improved access efficiency and increase and wirelessly connects
Enter power system capacity, improves the GFDM/CDMA mixing multiple access radio switch-in method of GFDM inter-sub-carrier interference.
Above-mentioned purpose of the invention can be reached by the following measures, a kind of GFDM/CDMA mixing multiple access wireless access
Method, it is characterised in that include the following steps：It is mixed in multicarrier transmitter broad sense frequency division multiplexing GFDM/ CDMA CDMA more
In the wireless access system of location, spread spectrum slotted ALOHA is introduced, after user completes to base station Time and Frequency Synchronization, each user is random
Send the upstream data for reaching that the base station moment is each time slot initial time；Use sub-carrier number for K, each subcarrier can carry
Symbolic number is that the broad sense frequency division multiplexing GFDM system sub-carrier of M is numbered；When user sends data, between adjacent sub-carrier
PN sequence is added to be spread, i.e., the same PN1 is used to odd number sub-carriers, dual numbers sub-carriers use same
PN2 offsets the interference between nonopiate subcarrier with this.It is random to occupy broad sense frequency division multiplexing GFDM when each user sends data
The subcarrier ci of symbol, and the character position of its remaining sub-carriers is carried out to set 0, by the modulation feature of broad sense frequency division multiplexing GFDM with
The intrinsic spread spectrum nature of spread spectrum slotted ALOHA combines, and different pseudo-random sequence spread spectrums are added between adjacent sub-carrier；Each user
It is transmitted after carrying out GFDM modulation to subcarrier data after spread spectrum；Receiving end is received by different time-gap, when to transmitting after GFDM modulation
Mixed signal carries out matched filtering detection removal filters affect in gap ALOHA, then using corresponding PN sequence sets respectively to surprise
Even sub-carrier frequency domain data are de-spread, and using spread spectrum come extending neighboring subcarrier spectrum, pass through Fast Fourier Transform Inverse
IFFT demodulates multi-user's time domain data；It detects whether to have selected same subcarrier and same CDMA communication there are user
The PN code of system CDMA, and same time slot is selected to send situation, default collision abandons crash data, and collision user is waiting
By random delay after confirmation character ACK time-out, random sub carrier wave, PN code is selected to be retransmitted；Collision situation if it does not exist connects
Receiving end sends confirmation character ACK and resource allocation information to user on same time-frequency code resource block, and user receives confirmation character
After ACK, associated traffic channel resource transmission data can be occupied according to resource allocation information.
The present invention has following good effect compared with the prior art：
The present invention is directed to the user using adjacent sub-carrier, has interference to each other, it is difficult to the problem of realizing, using in adjacent son
Different pseudo-random sequence spread spectrums are added in intercarrier, counteract this interference.It is good to take full advantage of adjacent sub-carrier frequency expansion sequence
Autocorrelation and cross correlation greatly improve wireless access system so that the probability that user is correctly distinguished greatly improves
System access efficiency and power system capacity.In the system for carrying out random access using CDMA slotted ALOHA, extending neighboring carrier frequency is utilized
The method of spectrum improves GFDM inter-sub-carrier interference, increases the optional signal freedom degree of user.In the item for increasing multiple frequency expansion sequences
Under part, the modulation feature of GFDM is combined with the intrinsic spread spectrum nature of spread spectrum slotted ALOHA, is added between adjacent sub-carrier
Different pseudo-random sequence spread spectrums, have cleared up the inter-sub-carrier interference of GFDM.The thought that spread spectrum is utilized carrys out extending neighboring subcarrier
Frequency spectrum, so that the user using adjacent sub-carrier is successfully distinguished.And make when the different same time slots of user's random access
When, user, which has chosen adjacent subcarrier and interferes to each other, to be offset.
The present invention introduces traditional spread spectrum slotted ALOHA on the basis of multi-transceiver technology GFDM, and the modulation of GFDM is special
Point is combined with the intrinsic spread spectrum nature of spread spectrum slotted ALOHA, when this mixing multiple access technology substantially intact remains spread spectrum
All advantages (such as system is realized simple) of gap ALOHA, and on this basis, introduce Multicarrier Transmission Technology GFDM
The advantages of, at the same by GFDM transmission technology and the spread spectrum in spread spectrum slotted ALOHA carried out it is perfect merge, greatly mention
The high access efficiency of user.Compared with orthogonal frequency division multiplex OFDM, GFDM has lower the broad sense frequency division multiplexing GFDM of use
Peak-to-average power ratio (PAPR) and out of band spectrum leakage.Compared with other multicarrier waveform schemes, broad sense frequency division multiplexing GFDM tool
There are stronger flexibility and adaptability.
The present invention is added PN sequence creatively between adjacent sub-carrier and spreads, i.e., uses odd number sub-carriers same
One PN1, dual numbers sub-carriers use the same PN2, the interference between nonopiate subcarrier are offset with this, without will increase
Too many complexity, this is also exactly maximum innovative point of the invention.
Detailed description of the invention
Fig. 1 is the functional block diagram of the multicarrier transmitter of broad sense frequency division multiplexing GFDM system of the present invention.
Fig. 2 is CDMA slotted ALOHA random access multi-access mode schematic diagram.
Fig. 3 is the frequency response curve schematic diagram of GFDM adjacent sub-carrier filter.
The course of work of the invention is just further described in conjunction with attached drawing below.
Specific embodiment
Refering to fig. 1.According to the present invention, it is mixed in multicarrier transmitter broad sense frequency division multiplexing GFDM/ CDMA CDMA more
In the wireless access system of location, spread spectrum slotted ALOHA is introduced, after user completes to base station Time and Frequency Synchronization, each user is random
Send the upstream data for reaching that the base station moment is each time slot initial time；Use sub-carrier number for K, each subcarrier can carry
Symbolic number is the broad sense frequency division multiplexing GFDM system of M, and sub-carrier is numbered：C1, c2 ..., ck；When user sends data,
PN sequence is added between adjacent sub-carrier to be spread, i.e., the same PN1, dual numbers sub-carriers are used to odd number sub-carriers
Using the same PN2, the interference between nonopiate subcarrier is offset with this.It is random to occupy GFDM symbol when each user sends data
Number subcarrier ci, and the character position of its remaining sub-carriers is carried out to set 0, by the modulation feature and spread spectrum slotted ALOHA of GFDM
Intrinsic spread spectrum nature combines, and different pseudo-random sequences are added between adjacent sub-carrier and are spread；After each user is to spread spectrum
Subcarrier data transmits after carrying out GFDM modulation；Receiving end is received by different time-gap, to mixed signal progress in CDMA slotted ALOHA
Removal filters affect is detected with filtering, then odd even sub-carrier frequency domain data are solved respectively using corresponding PN sequence sets
Expand, using spread spectrum come extending neighboring subcarrier spectrum, multi-user's time domain data is demodulated by Fast Fourier Transform Inverse IFFT；
It detects whether the PN code for having selected same subcarrier and same code division multiple address communication system CDMA there are user, and selects same
One time slot sends situation, and default collision abandons crash data, and collision user is after waiting character ACK time-out to be confirmed by random
Time delay selects random sub carrier wave, PN code to be retransmitted；Collision situation if it does not exist, receiving end is on same time-frequency code resource block
It sends and confirms that character ACK and resource allocation information, can be according to resource allocation informations after user receives confirmation character ACK to user
Occupy associated traffic channel resource transmission data.
In multicarrier transmitter, the symbolic number of each subcarrier transmission is M, k-th sub-carrierData indicate
For the data of M × 1, M × 1 sub-carrierVector is adopted on L by Fast Fourier Transform (FFT) FFT with up-sampling multiple
Sample is through 1 { PN of sequence sets1, PN3..., PN2n+1And 2 { PN of PN sequence sets2, PN4..., PN2nSpread, formed two puppets with
The odd number sub-carriers or even number sub-carriers LM × 1 and set vector that machine sequence sets PN is selected for user, chosen odd number PN sequence
Any PN sequence carries out Direct Sequence Spread Spectrum to its frequency domain data in column collection or even number PN sequence sets, and spread results pass through LM × 1
Filter, then carry out cyclic shift and obtain exporting KM through Fast Fourier Transform (FFT) FFT after the vector of KM × 1, the summation of the vector of KM × 1
× 1 signal phasor, wherein K is number of sub carrier wave.The specific steps for completing above-mentioned task include：
Step 1：After user completes to base station Time and Frequency Synchronization, each user sends upstream data at random, guarantees to reach the base station moment
For each time slot initial time.
Step 2：When each user sends data, broad sense frequency division multiplexing GFDM system is K with even subcarriers number, every height
The carry-on odd number symbols number M of carrier wave, and each power power of value K=2, sub-carrier are numbered as c1, c2..., ck,
The random subcarrier c for occupying GFDM symboli, and the character position of its remaining sub-carriers is carried out to set 0.
Step 3：There are two pseudo-random sequence collection { PN1, PN3..., PN2n+1, { PN2, PN4..., PN2n, auto-correlation
Property, cross correlation are good.If user has selected odd number symbols subcarrier, in { PN in previous step1, PN3..., PN2n+1}
Pseudo-random sequence is concentrated, and any PN sequence in odd number PN sequence sets is selected to carry out Direct Sequence Spread Spectrum to its frequency domain data；If
Even number symbols subcarrier is selected, then in { PN2, PN4..., PN2nPseudo-random sequence concentrate it is any in selection even number PN sequence sets
PN sequence carries out Direct Sequence Spread Spectrum to its frequency domain data.
Step 4：Block diagram is transmitted according to Fig. 1, and each user passes after carrying out GFDM modulation to subcarrier data after spread spectrum
It is defeated.
Step 5：Receiving end is received by different time-gap, carries out matched filtering detection removal filtering to mixed signal in time slot
Device influences, and is then de-spread respectively to odd even sub-carrier frequency domain data using corresponding PN sequence sets, and pass through fast Fourier
Inverse transformation IFFT demodulates multi-user's time domain data.
Step 6：Then it detects whether to have selected same subcarrier and same PN code there are user and select with for the moment
Gap sends situation, and default collision abandons crash data, and for collision user by random delay after waiting ACK time-out, selection is random
Subcarrier, PN code are retransmitted.Collision situation if it does not exist, receiving end send ACK and resource on same time-frequency code resource block
Information is distributed to user, after user receives ACK, associated traffic channel resource transmission data can be occupied according to resource allocation information.
Refering to Fig. 2.Mixing multiple access technology based on broad sense frequency division multiplexing can divide situation discussion.Following explanation is based on puppet
Random sequence collection is { PN1}、{PN2This special circumstances.Assuming that having U1, U2, U3 in a mobile communication system ...,
Ui..., ULA respectively to send the user of data in the initial position of each time slot by CDMA slotted ALOHA mode, L is natural number, they
Next specific working mode of point situation to the invention is described in detail.
The first situation is, whithin a period of time only one user U1Produce data d to be sent(i), then next
The time slot initial time of data can be sent, which carries out data transmission along the interval slots of channel by initial time, retransmits
It retransmits again, receiving end normally receives retransmission data, will not clash.
Second situation is that whithin a period of time, there is user UiSubcarrier is selected, while producing data to be sent, and
The subcarrier of each user's selection is different, and initiates data in the same time slot and send, and retransmitted.
The third situation is that have multiple users to select same subcarrier and same PN code, and same time slot is selected to send out
It gives a present condition, K user, and 1<K<L carries out data transmission along the interval slots of channel by initial time, and collision user is waiting
After ACK time-out, by random delay, random sub carrier wave, PN code is selected to be retransmitted or retransmitted, default collision abandons Collision Number
According to K is integer.
Refering to Fig. 3.GFDM introduces Pulse shaped filter to system transmission subcarrier, although the calculating for increasing system is multiple
Miscellaneous degree, but band outward leakage can also be reduced simultaneously, and can increase flexibility.The frequency of GFDM adjacent sub-carrier filter is rung
It answers in curve graph, the Raised-Root Cosine Pulse formed filter that wireless access system is 0.5 using rolloff-factor configures 3 PN1、
PN2、PN1Amplitude intersection subcarrier curve, forms the spectrum curve of each subcarrier.
It is the description to the present invention and its embodiment provided to the engineers and technicians in familiar field of the present invention above,
These descriptions should be considered to be illustrative and not restrictive.Engineers and technicians can be accordingly in invention claims
Thought is done specific operation and is implemented, without prejudice to the spirit and scope of the invention as defined in the appended claims, can be right
It makes a variety of changes in the form and details.Above-mentioned these are regarded as coverage of the invention.
Claims (10)
1. a kind of GFDM/CDMA mixing multiple access radio switch-in method, it is characterised in that include the following steps：In multicarrier transmitter
In the wireless access system of broad sense frequency division multiplexing GFDM/ CDMA CDMA mixing multiple access, introduce spread spectrum slotted ALOHA, with
After family is completed to base station Time and Frequency Synchronization, each user sends the upper line number for reaching that the base station moment is each time slot initial time at random
According to；Use sub-carrier number for K, each subcarrier can carry the broad sense frequency division multiplexing GFDM system sub-carrier that symbolic number is M
It is numbered；When user sends data, PN sequence is added between adjacent sub-carrier and is spread, i.e., odd number sub-carriers are used
The same PN1, dual numbers sub-carriers use the same PN2, offset the interference between nonopiate subcarrier with this.
2. GFDM/CDMA mixing multiple access radio switch-in method as described in claim 1, it is characterised in that：Each user sends number
According to when, the random subcarrier ci for occupying broad sense frequency division multiplexing GFDM symbol, and the character position of its remaining sub-carriers is carried out to set 0,
The modulation feature of broad sense frequency division multiplexing GFDM is combined with the intrinsic spread spectrum nature of spread spectrum slotted ALOHA, in adjacent sub-carrier
Between different pseudo-random sequences spread spectrum is added, each user is transmitted after carrying out GFDM modulation to subcarrier data after spread spectrum.
3. GFDM/CDMA mixing multiple access radio switch-in method as described in claim 1, it is characterised in that：Receiving end is by difference
Time slot receives, and carries out matched filtering detection removal filters affect to mixed signal in transmission time slot ALOHA after GFDM modulation, so
Odd even sub-carrier frequency domain data are de-spread respectively using corresponding PN sequence sets afterwards, using spread spectrum come extending neighboring subcarrier frequency
Spectrum, demodulates multi-user's time domain data by Fast Fourier Transform Inverse IFFT；It detects whether to have selected there are user same
The PN code of subcarrier and same code division multiple address communication system CDMA, and same time slot is selected to send situation, default collision abandons
Crash data, collision user, by random delay, select random sub carrier wave, PN code to carry out after waiting character ACK time-out to be confirmed
It retransmits；Collision situation if it does not exist, receiving end send confirmation character ACK and resource allocation information on same time-frequency code resource block
To user, after user receives confirmation character ACK, associated traffic channel resource transmission data are occupied according to resource allocation information.
4. GFDM/CDMA mixing multiple access radio switch-in method as described in claim 1, it is characterised in that：In multi-carrier transmission
In machine, the symbolic number of each subcarrier transmission is M, k-th sub-carrierData are expressed as the data of M × 1, and M × 1 carries
Wave symbolVector by Fast Fourier Transform (FFT) FFT, with up-sample multiple for L up-sampling through 1 { PN of sequence sets1, PN3...,
PN2n+1And 2 { PN of PN sequence sets2, PN4..., PN2nSpread, form the surprise that two pseudo-random sequence collection PN are selected for user
Number sub-carriers or even number sub-carriers LM × 1 and set vector.
5. GFDM/CDMA mixing multiple access radio switch-in method as described in claim 1, it is characterised in that：Select odd number PN sequence
Any PN sequence carries out Direct Sequence Spread Spectrum to its frequency domain data in column collection or even number PN sequence sets, and spread results pass through LM × 1
Filter, then carry out cyclic shift and obtain exporting KM through Fast Fourier Transform (FFT) FFT after the vector of KM × 1, the summation of the vector of KM × 1
× 1 signal phasor, wherein K is number of sub carrier wave.
6. GFDM/CDMA mixing multiple access radio switch-in method as described in claim 1, it is characterised in that：User completes to base
After Time and Frequency Synchronization of standing, each user sends upstream data at random, guarantees that reaching the base station moment is each time slot initial time.
7. GFDM/CDMA mixing multiple access radio switch-in method as described in claim 1, it is characterised in that：Each user sends number
According to when, broad sense frequency division multiplexing GFDM system is K with even subcarriers number, each carry-on odd number symbols number M of subcarrier, and
Each power power of value K=2, sub-carrier are numbered as c1, c2..., ck, the random subcarrier c for occupying GFDM symboli, and
The character position of its remaining sub-carriers is carried out setting 0.
8. GFDM/CDMA mixing multiple access radio switch-in method as described in claim 1, it is characterised in that：If user selects
Odd number symbols subcarriers, then in { PN1, PN3..., PN2n+1Pseudo-random sequence concentration, select any PN in odd number PN sequence sets
Sequence carries out Direct Sequence Spread Spectrum to its frequency domain data；If even number symbols subcarrier has been selected, in { PN2, PN4...,
PN2nPseudo-random sequence concentrates any PN sequence in selection even number PN sequence sets to carry out Direct Sequence Spread Spectrum, n to its frequency domain data
For natural number.
9. GFDM/CDMA mixing multiple access radio switch-in method as described in claim 1, it is characterised in that：Based on pseudorandom sequence
Column collection is { PN1}、{PN2This special circumstances, being set in a mobile communication system has U1, U2, U3 ..., Ui..., ULIt is a
Respectively the user of data is sent in the initial position of each time slot by CDMA slotted ALOHA mode；Whithin a period of time, if only one
User U1Data d to be sent is produced, then in next time slot initial time that can send data, which presses initial time
Data transmission is carried out along the interval slots of channel, retransmits and retransmits again, receiving end normally receives retransmission data, will not rush
Prominent, wherein L is natural number.
10. GFDM/CDMA mixing multiple access radio switch-in method as claimed in claim 9, it is characterised in that：In a period of time
It is interior, there is user UiSubcarrier is selected, while producing data to be sent, and the subcarrier of each user selection is different, and
Data are initiated in the same time slot to send, and are retransmitted；If there are multiple users to select same subcarrier and same PN code, and
And the same time slot transmission situation of selection, K user, and 1<K<L, the interval slots by initial time along channel carry out data hair
It send, collision user by random delay, selects random sub carrier wave, PN code to be retransmitted or retransmitted, write from memory after waiting ACK time-out
Recognize collision, abandons crash data, K is integer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810516418.6A CN108900459A (en) | 2018-05-25 | 2018-05-25 | GFDM/CDMA mixing multiple access radio switch-in method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810516418.6A CN108900459A (en) | 2018-05-25 | 2018-05-25 | GFDM/CDMA mixing multiple access radio switch-in method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108900459A true CN108900459A (en) | 2018-11-27 |
Family
ID=64343264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810516418.6A Pending CN108900459A (en) | 2018-05-25 | 2018-05-25 | GFDM/CDMA mixing multiple access radio switch-in method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108900459A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109347773A (en) * | 2018-11-30 | 2019-02-15 | 南京邮电大学 | A kind of receiver design method of multi-user's uplink broad sense frequency division multiple access system |
| CN111010360A (en) * | 2019-12-20 | 2020-04-14 | 南开大学 | Mixed carrier modulation method based on precoding |
| CN111542090A (en) * | 2020-04-30 | 2020-08-14 | 北京邮电大学 | Method and device for accessing polarized timeslot ALOHA for resisting partial data packet deletion |
| CN113972968A (en) * | 2021-11-19 | 2022-01-25 | 中国电子科技集团公司第三十八研究所 | Periodic short message transmission method and system based on active delay spread spectrum Aloha protocol |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1463097A (en) * | 2003-05-13 | 2003-12-24 | 武汉汉网高技术有限公司 | Random access method utilized in orthographic frequency division multiple access (OFDM) system |
| US20150172010A1 (en) * | 2013-12-12 | 2015-06-18 | Vodafone Gmbh | Gfdm radio transmission using a pseudo circular preamble |
| CN106507497A (en) * | 2015-09-08 | 2017-03-15 | 华为技术有限公司 | For the method for transmitting uplink data, terminal unit and the network equipment |
| CN106792739A (en) * | 2016-11-17 | 2017-05-31 | 北京邮电大学 | Network dicing method, device and equipment |
| CN107343321A (en) * | 2016-04-29 | 2017-11-10 | 中兴通讯股份有限公司 | Up-link access method and device, emitter, receiver, terminal |
| CN108055221A (en) * | 2017-11-22 | 2018-05-18 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | CPFSK signal(-) carrier frequency catching methods |
-
2018
- 2018-05-25 CN CN201810516418.6A patent/CN108900459A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1463097A (en) * | 2003-05-13 | 2003-12-24 | 武汉汉网高技术有限公司 | Random access method utilized in orthographic frequency division multiple access (OFDM) system |
| US20150172010A1 (en) * | 2013-12-12 | 2015-06-18 | Vodafone Gmbh | Gfdm radio transmission using a pseudo circular preamble |
| CN106507497A (en) * | 2015-09-08 | 2017-03-15 | 华为技术有限公司 | For the method for transmitting uplink data, terminal unit and the network equipment |
| CN107343321A (en) * | 2016-04-29 | 2017-11-10 | 中兴通讯股份有限公司 | Up-link access method and device, emitter, receiver, terminal |
| CN106792739A (en) * | 2016-11-17 | 2017-05-31 | 北京邮电大学 | Network dicing method, device and equipment |
| CN108055221A (en) * | 2017-11-22 | 2018-05-18 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | CPFSK signal(-) carrier frequency catching methods |
Non-Patent Citations (1)
| Title |
|---|
| ZTE: ""Discussion on LTE-based massive connectivity techniques"", 《3GPP TSG RAN MEETING #68》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109347773A (en) * | 2018-11-30 | 2019-02-15 | 南京邮电大学 | A kind of receiver design method of multi-user's uplink broad sense frequency division multiple access system |
| CN109347773B (en) * | 2018-11-30 | 2021-02-12 | 南京邮电大学 | Receiver design method for multi-user uplink generalized frequency division multiple access system |
| CN111010360A (en) * | 2019-12-20 | 2020-04-14 | 南开大学 | Mixed carrier modulation method based on precoding |
| CN111010360B (en) * | 2019-12-20 | 2022-11-04 | 南开大学 | Mixed carrier modulation method based on precoding |
| CN111542090A (en) * | 2020-04-30 | 2020-08-14 | 北京邮电大学 | Method and device for accessing polarized timeslot ALOHA for resisting partial data packet deletion |
| CN111542090B (en) * | 2020-04-30 | 2021-08-06 | 北京邮电大学 | Method and device for accessing polarized timeslot ALOHA for resisting partial data packet deletion |
| CN113972968A (en) * | 2021-11-19 | 2022-01-25 | 中国电子科技集团公司第三十八研究所 | Periodic short message transmission method and system based on active delay spread spectrum Aloha protocol |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10491261B1 (en) | Multi carrier frequency modulation spread spectrum communication system | |
| US8149780B2 (en) | Multiplexing scheme in a communication system | |
| EP1179902B1 (en) | Transmitter, receiver, and method of data transmission | |
| US7751304B2 (en) | Apparatus and method for transmitting/receiving pilot code pattern for identification of base station in communication system using orthogonal frequency division multiplexing scheme | |
| EP0786890B1 (en) | Resource allocation in a multi-user, multicarrier mobile radio system | |
| US7468943B2 (en) | Transmission/Reception apparatus and method in a mobile communication system | |
| CN108900459A (en) | GFDM/CDMA mixing multiple access radio switch-in method | |
| Li | The perspectives of large area synchronous CDMA technology for the fourth-generation mobile radio | |
| JP3748853B2 (en) | Multi-dimensional orthogonal resource hopping multiplex communication method and apparatus | |
| RU2328821C2 (en) | Control of radio interferences for smooth transmission of servicing and broadcast servicing in wireless communication system with frequency hopping (fh) | |
| KR100960553B1 (en) | Multi-sector broadcast paging channel | |
| KR100918730B1 (en) | Apparatus for transmitting/receiving pilot pattern set for distinguish base station in communication system using orthogonal frequency division multiplexing scheme and method thereof | |
| CN102647266B (en) | Dual-mode shared OFDM methods/transmitters, receivers and systems | |
| CN101796862B (en) | Base station device, mobile station device, distributed antenna wireless communication system, pilot channel generation method, synchronization channel generation method, and antenna selection method | |
| CN102497218B (en) | Mobile station, communication system and communication method | |
| WO2010061271A2 (en) | Orthogonal reference signals with different bandwidth and overlapping spectrum | |
| WO2007122828A1 (en) | Pilot signal transmitting method and wireless communication apparatus | |
| JP2008182668A (en) | Ofdm radio communication method and radio communication apparatus | |
| US20060187887A1 (en) | Wireless multiple access system for suppressing inter-cell interference | |
| WO2008091951A2 (en) | Hybrid subcarrier mapping method and system | |
| KR101335966B1 (en) | Method for transmitting control information on the forward link of a wireless network | |
| CN101001235A (en) | Time synchronous and frequency synchronous method of weakly energy parallel PN sequence | |
| CN1889754B (en) | Method and system for using reference symbol of multi-cell system | |
| CN101340273A (en) | Multi-address access method, apparatus and system | |
| KR20080095731A (en) | Method for generating sequence and method for transmitting signal based on sequence in mobile communication system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20181127 |