CN103986684B - Frame scrambling and descrambling method in MIMO wireless communication system and communication device thereof - Google Patents
Frame scrambling and descrambling method in MIMO wireless communication system and communication device thereof Download PDFInfo
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- CN103986684B CN103986684B CN201410240504.0A CN201410240504A CN103986684B CN 103986684 B CN103986684 B CN 103986684B CN 201410240504 A CN201410240504 A CN 201410240504A CN 103986684 B CN103986684 B CN 103986684B
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Abstract
The invention discloses a frame scrambling and descrambling method in an MIMO wireless communication system. The frame scrambling and descrambling method in the MIMO wireless communication system includes the following steps that a frame containing a training sequence, a signaling field and a data part is generated, the signaling field and the data part are respectively input into a scrambler to be scrambled, wherein the signaling field contains an subfield in the initialized state of the scrambler; a transmitter transmits the frame to a receiver, and the signaling field and the data part are descrambled by the receiver according to the subfield in the initialized state in the received signaling field. The invention further provides a communication device using the frame scrambling and descrambling of a single-user MIMO communication system or a multi-user MIMO communication system in the MIMO wireless communication system. Through the frame scrambling and descrambling method and the communication device, the peak-to-average power ratio of baseband signals can be effectively decreased, so that the design difficulty of a power amplifier is reduced, the linear output power is increased, and the coverage of the wireless communication system is expanded.
Description
Technical field
The invention belongs to wireless communication technology field, the frame scrambling in more particularly to a kind of mimo wireless communication system is conciliate
Disturb method and its communicator.
Background technology
Wireless communication spectrum resource is increasingly rare and demand of very high-speed data transfer speed, millimeter wave frequency band ultrahigh speed without
Line communication technology increasingly attracts attention, as one of technology most potential in future wireless system technology.
45GHz frequency ranges MIMO (Multiple Input Multiple Output, MIMO) wireless communication technology belongs to milli
The metric wave communication technology, towards the application such as ultrahigh speed wireless access, can realize that the ultrahigh speed of equipment room 10Gbps is wirelessly transferred.In the least
Compared with low-frequency range, its feature includes metric wave：One is that available spectral range is wide, and channel capacity is big；Two is easily to realize narrow ripple
The antenna of beam and high-gain, thus high resolution, good in anti-interference performance.
The transmission letter of OFDM (Orthogonal Frequency Division Multiplexing, OFDM) communication system
Number be the superposition of multiple sub-carrier signals, when the phase of multiple sub-carrier signals is consistent, resulting superposed signal it is instantaneous
Power can be far longer than the mean power of signal, cause larger peak-to-average power ratio (Peak to Average Power occur
Ratio,PAPR).General ofdm communication system can only be inserted in data transfer between information source and forward error correction coder
One scrambler unit, its effect is to avoid the occurrence of long string of 1 or 0, and this helps to improve peak-to-average power ratio.
IEEE 802.11n can be operated in 2.4GHz and 5GHz frequency ranges, and IEEE 802.11ac are operated in 5GHz frequency ranges.IEEE
The maximum transmission power of 802.11n and IEEE 802.11ac does not allow more than 100mW.The a width of 20MHz of band of IEEE 802.11n
Or 40MHz.The bandwidth of IEEE 802.11ac has four kinds, respectively 20MHz, 40MHz, 80MHz and 160MHz.Frequency above
Limited with band width configuration and maximum transmission power so that the power efficiency problem of IEEE 802.11n and IEEE 802.11ac
It is not to protrude very much, therefore does not include in signaling field not by scrambler unit during the signaling field transmission of said system
Scrambler init state subfield.
But in millimeter wave frequency band, signal frequency of eating dishes without rice or wine is very high and bandwidth of carrying signal is very wide so that 100mW power outputs
Linear amplifier design it is extremely difficult.Therefore, in the urgent need to research further reduces baseband output signal peak-to-average power ratio
Method, to mitigate the design difficulty of power amplifier.The IEEE 802.11ad for being operated in 60GHz include scrambler in header fields
Initialization field, but IEEE 802.11ad wireless communication systems only realize beam forming technique, are not spread including many spaces of MIMO
Transferring technology, not including Single User MIMO or multiuser MIMO.
The content of the invention
Goal of the invention：The purpose of the present invention is to solve the shortcomings of the prior art, there is provided one kind can be reduced effectively
Frame scrambling in the mimo wireless communication system of baseband signal peak-to-average power ratio and de-scrambling method in mimo wireless communication system.
Technical scheme：The invention provides the frame scrambling in a kind of mimo wireless communication system and de-scrambling method, including with
Lower step：Generation includes the frame of training sequence, signaling field and data division, and the signaling field and data division difference is defeated
Enter and scrambled in scrambler, wherein, signaling field includes the init state subfield of scrambler；Emitter sends out frame
Receiver is given, receiver enters according to the init state subfield received in signaling field to signaling field and data division
Row descrambling,
When the mimo wireless communication system is Single User MIMO communication system, signaling field is signaling field A；It is described
When mimo wireless communication system is multi-user MIMO communication system, signaling field is signaling field A and signaling field B.
Wherein, in for the wireless communication system of Single User MIMO, the signaling field and data division are scrambled
Method be：
Step 101：The 8th input scrambler of signaling field A, scrambler randomly generates init state, described random
Produce the scrambler initialization subfield in the value write-in signaling field A of init state；
Step 102：After signaling field A scramblings terminate, scrambler break-off, and current state is preserved, after sending scrambling
Signaling field A；
Step 103：Insertion millimeter wavelength training sequence is sent, and the millimeter wavelength training sequence is not scrambled；
Step 104：After having sent millimeter wavelength training sequence, continued to data portion according to the scrambler state for preserving before
Divide and scrambled, and send generated scrambled data.
Further, in for the wireless communication system of multiuser MIMO, the signaling field and data division are added
The method disturbed is：
Step 201：The 8th input scrambler of signaling field A, scrambler randomly generates init state, described random
Produce the scrambler initialization subfield in the value write-in signaling field A of init state；
Step 202：After signaling field A scramblings terminate, scrambler is stopped, and does not preserve current state, after sending scrambling
Signaling field A；
Step 203：Insertion millimeter wavelength training sequence is sent, and the millimeter wavelength training sequence is not scrambled；
Step 204：After sending millimeter wavelength training sequence, the 8th the input scrambler, scrambler of the signaling field B
Init state is randomly generated, scrambler initialization of the scrambler initialization state value write-in signaling field B for randomly generating
Field；
Step 205：Signaling field B scrambling terminate after, scrambler continue data portion scrambled, and send scrambling after
Signaling field B and data division.
Further, in for the wireless communication system of Single User MIMO, signaling field and data division are descrambled
Method is：
Step 301：, from the 8th input descrambler, the init state of descrambler is according to reception signaling field for signaling field A
7 scrambler initialization fields are produced before A；
Step 302：After signaling field A descramblings terminate, descrambler break-off, and preserve current state；
Step 303：Millimeter wavelength training sequence is received, the millimeter wavelength training sequence does not descramble；
Step 304：After having received millimeter wavelength training sequence, continued to data portion according to the descrambler state for preserving before
Divide and descrambled, and receive generated descrambling data.
Further, in for the wireless communication system of multiuser MIMO, signaling field and data division are descrambled
Method is：
Step 401：, from the 8th input descrambler, the init state of descrambler is according to reception signaling field for signaling field A
Preceding 7 scrambler initialization fields of A are produced；
Step 402：After signaling field A descramblings terminate, descrambler is stopped, and does not preserve current state；
Step 403：Receive millimeter wavelength training sequence；
Step 404：After having received millimeter wavelength training sequence, the 8th input descrambler of signaling field B, at the beginning of descrambler
Beginning state is produced according to the preceding 7 scrambler initialization fields for receiving signaling field B；
Step 405：After signaling field B descramblings terminate, descrambler is not stopped, and continues data portion and is descrambled,
And receive generated descrambling data.
Present invention also offers the frame scrambling in a kind of use mimo wireless communication system and the communicator of de-scrambling method,
Including：Processing system, transmitter and receiver, wherein,
The processing system is divided into the processing system of transmitter terminal and the processing system of receiver end；Wherein described emitter
The processing system at end is used to generate includes the frame of training sequence, signaling field and data division, and by the signaling field sum
It is separately input to be scrambled in scrambler according to part；The processing system of the receiver end be used for will receive signaling field and
Data division is separately input to be descrambled in descrambler；
The emitter, for scrambled frame to be sent into the receiver by channel；
The receiver, for receiving the frame that the emitter sends；
Further, the scrambler includes 7 bit shift registers and two XOR modules.
Further, the method for scrambling of the scrambler is：Scrambler randomly generates the initialization of 7 bit shift registers first
State, the init state subfield of the scrambler in 7 value write-in signaling fields of original state；Then 7 bit shifts deposit
The 4th and the 7th in device init state carries out XOR, the 1st, the data input shift register of generation, and and input
Other fields of signaling field or data division produce after XOR other fields or data portion of the signaling field after scrambling
Point.
Beneficial effect：Compared with prior art, the present invention can effectively reduce baseband signal peak-to-average power ratio, so as to reduce work(
The design difficulty of rate amplifier simultaneously increases linear power output, expands the coverage of wireless communication system.
Brief description of the drawings
Fig. 1 is the schematic diagram of mimo wireless communication network；
Fig. 2 is access point and two structural representations of user terminal in mimo systems；
Fig. 3 by scrambled to signaling field A use scrambler transmission block diagram；
Fig. 4 by scrambled to signaling field B use scrambler transmission block diagram；
Fig. 5 is the structural representation of the preamble portion of Single User MIMO system；
Fig. 6 is the structural representation of the preamble portion of multi-user MIMO system；
Fig. 7 is the structural representation of signaling field A in the present invention；
Fig. 8 is the structural representation of signaling field B in the present invention；
Fig. 9 is the structural representation of the scrambler that the present invention is used；
Figure 10 is the flow chart that the present invention is scrambled and descrambled in Single User MIMO communication system；
Figure 11 is the flow chart that the present invention is scrambled and descrambled in multi-user MIMO communication system.
Specific embodiment
Technology of the invention can be used for various system of broadband wireless communication, and the example of this communication system includes millimeter wave
Wireless MIMO communication systems etc..
The method of the present invention may be implemented in various wired or wireless communication devices, what the method in the present invention was realized
Radio node can include access point or access terminal.
Access point (Access Point, AP) can include, be implemented as or be base station transceiver, base station, transceiver
Function, wireless router, transceiver, Basic Service Set (Basic Service Set, BSS), extended service set
(Extended Service Set, ESS) or some other terms.
User terminal (User Terminal, UT) can include, be implemented as or be access terminal, subscriber station, use
Family unit, movement station, user terminal, user's set, user equipment or some other terms.In some implementations, access
Terminal can including possess wireless connection capability phone, mobile phone, etc. computer
As shown in figure 1, the multiple-access MIMO system with access point and user terminal.When any given, access point
Can be communicated with one or more user terminals on the downlink and uplink.Downlink be from access point to
The communication link of family terminal, up-link is the communication link from user terminal to access point.User terminal can also with it is another
User terminal communicates point-to-pointly.System access controller is connected to access point, and provides coordination to access point and control.
System can be using multiple transmitting antennas and multiple reception antennas for number on the downlink and uplink
According to transmission.User terminal can be furnished with one or more antennas.
Mimo system can be time division duplex (Time Division Duplexing, TDD) system or FDD
(Frequency Division Duplexing, FDD) system.For TDD system, downlink and up-link share identical
Frequency band.For FDD system, downlink and up-link use different frequency bands.Mimo system can also utilize single carrier
Or multicarrier is transmitted.
As shown in Fig. 2 access point and two structural representations of user terminal in mimo systems, access point is equipped with N
Individual antenna, user terminal 1 is furnished with N number of antenna, and user terminal 2 is furnished with N number of antenna.Access point is directed to the transmitting reality of downlink
Body and the receiving entity for up-link." transmitting entity " is can to send data by wireless channel as used in this article
Independent operation device or equipment, " receiving entity " be can by wireless channel receive data independent operation device or
Equipment.
On uplink, selected each user terminal, transmitting baseband signal transacting are being transmitted for up-link
Device receives the business datum from data source and the control data from controller.Transmitting baseband signal processor is based on and is directed to
The associated coding of the selected speed of user terminal and modulation scheme the business datum of user terminal is processed (for example,
Scrambler, coding interweaves and modulates), and data symbol stream is provided, spatial manipulation then is performed to data symbol stream, and be N number of day
Line provides N number of transmitting symbol stream.Digital to analog converter is converted to analog baseband signal by symbol stream data signal is launched, each
The transmitter unit of millimeter-wave transceiver is received and processes (for example, amplification, filtering and frequency up-converted, power amplification) respectively
From transmitting symbol stream generating uplink signal.
At receiving point, N number of antenna receives the uplink signal that all of user terminal is launched on uplink, often
The signal of reception is supplied to individual antenna the receiver unit of respective millimeter-wave transceiver.Each receiver unit perform with
The process of the process complementation performed by user terminal transmitter unit, the signal of reception is by providing reception after analog-digital converter
Stream of digital symbol.The symbol stream of the baseband signal processor to receiving that receive of access point performs receiver space treatment, and
The uplink channel symbols stream of N number of recovery is provided.Inverted according to channel correlation matrix, Minimum Mean Square Error, soft rot bacteria or some
Other technologies come perform receiver space treatment.Each uplink data signals symbol stream recovered is to by corresponding user
The estimation of the data symbol stream that terminal sends.Then the speed for being used according to the uplink data symbols stream for each recovery
The stream is processed, to obtain decoding data.Can by for each user terminal decoding data be supplied to data sink with
For storage and/or controller for further treatment.
On the uplink, at access point, transmitting baseband signal processor is received from for downlink transmission
The business datum of the data source of the user terminal of scheduling and the control data from controller.Can be on different transport channels
Send various types of data.The speed that transmitting baseband signal processor is based on being selected for each user terminal is processed
The business datum of (for example, scrambler, coding, interweave and modulate) user terminal.Transmitting baseband signal processor provides descending chain
Circuit-switched data symbol stream, then performs spatial manipulation to data symbol stream, and for N number of antenna provides N number of transmitting symbol stream.Digital mould
Intend converter and be converted to analog baseband signal by symbol stream data signal is launched, the transmitter unit of each millimeter-wave transceiver
(for example, amplification, filtering and frequency up-converted, power amplification) respective transmitting symbol stream is received and processed to generate descending chain
Road signal.
At each user terminal, N number of antenna receives down link signal from access point.The signal that each antenna will be received
It is supplied to the receiver unit of respective millimeter-wave transceiver.The signal of receiver unit output is by analog-digital converter
The stream of digital symbol of reception is provided afterwards.The symbol stream of the baseband signal processor to receiving that receive of user terminal performs receiver sky
Between process, and the downlink symbols stream of N number of recovery is provided for user terminal.Inverted according to channel correlation matrix, it is minimum
Variance, soft rot bacteria or some other technologies come perform receiver space treatment.Receive baseband signal processor extensive to each
The speed that multiple down link data symbol stream is used is processed the stream (for example, demodulation, deinterleaving and decoding) to obtain
For the decoding data of user terminal.
At each user terminal, receive baseband signal processor and include channel estimator, channel estimator is estimated descending
Link channel is responded and provides Downlink channel estimation, and Downlink channel estimation can include channel gain estimation, noise
Compared estimate, noise variance etc..Similarly, access point receives baseband signal processor and includes channel estimator, and channel estimator is estimated
Meter uplink channel responses simultaneously provide uplink channel estimation.Controller is also controlled at access point and at user terminal respectively
Make the operation of each processing unit.
As shown in figure 3, what is used in mimo wireless communication system in the present invention carries out scrambling institute to the signaling field A in frame
The transmission block diagram of the scrambler of use, wherein comprising such as lower module：
1) PHY padding physical layers zero padding；
2) Scrambler scramblers；
3) FEC (LDPC) encoders forward error corrections (low density parity check code) encoder；
4) Constellation mapper planispheres mapper；
5) LDPC tone mapping low-density parities test code subcarrier maps；
6) Replicate over multiple 540MHz for 1080MHz spectral band replications；
7) Inverse discrete Fourier transform (IDFT) inverse discrete Fourier transform；
8) Cyclic shift diversity (CSD) per STS insertion insertions are per empty time stream cyclic shift point
Collection；
9) Guard interval (GI) insertion and window insertions protection interval and adding window；
10) Analog and RF simulations and radio band；
As shown in figure 4, what is used in mimo wireless communication system in the present invention carries out scrambling institute to the signaling field B in frame
The transmission block diagram of the scrambler of use, it is as follows that it includes module：
1) PHY padding physical layers zero padding；
2) Scrambler scramblers；
3) Replicate over multiple 540MHz for 1080MHz spectral band replications；
4) FEC (LDPC) encoders forward error corrections (low density parity check code) encoder；
5) Constellation mapper planispheres mapper；
6) LDPC tone mapping low-density parities test code subcarrier maps；
7) Multiple the first column of P multiply P matrix first rows；
8) Cyclic shift diversity (CSD) per STS insertion insertions are per empty time stream cyclic shift point
Collection；
9) Spatial mapping space reflections；
10) Inverse discrete Fourier transform (IDFT) inverse discrete Fourier transform；
11) Guard interval (GI) insertion and window insertions protection interval and adding window；
12) Analog and RF simulations and radio band.
Frame method for scrambling in a kind of mimo wireless communication system provided by the present invention, mainly includes the following steps that：It is raw
Into the signaling field including training sequence, signaling field and data division, the signaling field and data division are input into respectively
Scrambled in scrambler, wherein, signaling field includes that the init state subfield of scrambler is used to store scrambler number
According to,；Frame is sent to receiver by emitter, and receiver sends into descrambler according to the initialization subfield received in signaling field
In signaling field and data division are descrambled.In Fig. 1 in shown mimo system, system is from access point to user terminal
Send training sequence and signaling field.Wherein, training sequence and signaling field are in the mimo system of single user and multi-user
Structure in mimo system is different.
Wherein, emitter is configured to pass channel and sends the signaling field, wherein, a width of 540MHz of band of the channel
Or 1080MHz.During a width of 540MHz of the band of the channel, the quantity of the subcarrier is 179, including 8 pilot sub-carriers, 3
Individual direct current subcarrier and 168 data subcarriers.
Emitter is configured to pass channel and sends the signaling field, wherein, the bandwidth of the channel can also be
1080MHz, and wherein, the quantity of the subcarrier is 355, including 16 pilot sub-carriers, 3 direct current subcarriers and 336
Individual data subcarrier.
As shown in figure 5, the structure of Single User MIMO preamble structure, as training sequence and signaling field, it can be wrapped
Short training sequence containing millimeter wave (Millimeter Wave Short Train Field, referred to as MSTF) field, signaling field
A, millimeter wavelength training sequence (referred to as MBTF) field, wherein signaling field A is 72 bits, takes 2 OFDM symbols.
As shown in fig. 6, the structure of multiuser MIMO preamble structure, as training sequence and signaling field, it can be wrapped
Field containing MSTF, signaling field A, MBTF field, wherein signaling field B, signaling field A are 72 bits, take 2 OFDM
Symbol.Wherein signaling field B is 48 bits, takes 2 OFDM symbols.
As shown in fig. 7, in the present invention signaling field A (referred to as SIG-A) structure, signaling field A can include scrambler
Device init state subfield, 7 bits.SC/OFDM fields can be included, 1 bit indicates single carrier transmission still
OFDM transmission.Can include bandwidth indication field, 1 bit, indicate system air interface transmission bandwidth be 540MHz or
1080MHz.Dynamic Bandwidth (dynamic bandwidth) field can be included, 1 bit indicates whether to allow dynamic band
Width is set；Sub-Band (subband is wide) field can be included, 2 bits in the case of dynamic bandwidth is allowed, use master
540MHz channels then could be arranged to 10, and 01 is then set to using secondary 540MHz channels；11 are then set to using whole bandwidth；It is no
Then it is set to 00.Length (length) field can be included, 18 bits indicate PSDU to carry the maximum length of data.Can
So that including STBC fields, 1 bit indicates whether system uses Space Time Coding.GroupID (packet number) word can be included
Section, 6 bits, it is Single User MIMO or multi-user to indicate PPDU (physical layer protocol data unit, referred to as PPDU)
MIMO.Aggregation (polymerization) field can be included, 1 bit indicates whether the data PPDU in packet includes A-
MPDU.NSTS/PartialAID (space-time fluxion and local association indications) field, 11 bits, multi-user can be included
8 bits indicate the spatial flow number of each user before during MIMO, behind 3 bits reserve；Before during Single User MIMO
2 bits in face indicate spatial flow number, behind 9 bits indicate PAID.Can include SU MCS fields, 3 bits,
MCS indexes during instruction Single User MIMO.Precoded (precoding) field can be included, 1 bit indicates Single User MIMO
Whether system PPDU has carried out corresponding wave beam precoding to sending data.TXOP_PS_NOT_ALLOWED (power can be included
Save) field, 1 bit indicates whether to allow non-AP-STA to enter sleep state in TXOP power save mode.Can wrap
Include HCS fields, 16 bits, the verification sequence of signaling field A.Its B70-B71,2 bits are reserved.Total signaling field
The length of A is 72 bits.
As shown in figure 8, in the present invention signaling field B (referred to as SIG-B) structure, signaling field B can include scrambler
7 bits of device init state.18 bits of MCS field lengths can be included, the value of MCS is indicated.Can include
18 bits of Length field lengths, indicate the byte number of PSDU, scope 1-162143.In signaling field B 28 to 31 it is pre-
Stay.16 bits of HCS field lengths, the verification sequence of signaling field B can be included.The length of total signaling field B is 48
Individual bit.
Exemplary signaling field scrambler initialization field, Single User MIMO system signaling field A emitters is described below
Scrambler initialization state is randomly generated, the state value write-in signaling field A scrambler initialization fields after generation, takes 7
Bit.
The signaling field A emitter scrambler initialization fields of multi-user MIMO communication system are randomly generated, after generation
State value writes signaling field A scrambler initialization fields, takes 7 bits.
Multi-user MIMO communication system signaling field B emitter scrambler initialization fields are randomly generated, the shape after generation
State value writes signaling field B scrambler initialization fields, takes 7 bits.
As shown in figure 9, the scrambler that invention is used includes 7 bit shift registers and two XOR modules.It is random first to produce
Raw 7 bit shift register init states, 7 values of original state can write the scrambler initialization field of signaling field.Then
4th and the 7th carries out XOR, the 1st, the data input shift register of generation, and and the signaling field of input other words
Section or data division produce other fields of signaling field or data division after scrambler after carrying out XOR.
As shown in Figure 10, the present invention is scrambled in Single User MIMO communication system and the specific method of descrambling is：
Step 10：Signaling field A the 8th is input into scrambler and is scrambled first, and the original state of scrambler is randomly generated,
The value write-in signaling field A scrambler initialization fields of generation；
Step 11：Signaling field A scramblings terminate rear scrambler break-off, preserve scrambler current operating state, that is, protect
The value of 7 bit shift registers is deposited, the signaling field A after scrambler is sent；
Step 12：Emitter insertion MBTF fields are transmitted；
Step 13：After having sent MBTF fields, data division is input into scrambler, 7 bit shift registers of scrambler
It is worth the value to preserve before, data are scrambled according to the value, then sends data after scrambling；
Step 14：Receiver descrambling module is initial according to the signaling field A scramblers for receiving when signaling field A is received
Change field to be descrambled；
Step 15：After having descrambled signaling field A, descrambler break-off preserves descrambler current operating state；
Step 16：MBTF fields are received, the field starts to receive data portion without descrambler after having received MBTF fields
Point, data division input descrambler, the state of descrambler is the working condition for preserving before, after thus receiving descrambling
Data.
As shown in figure 11, the present invention is scrambled in multi-user MIMO communication system and the specific method of descrambling is：
Step 20：Signaling field A the 8th is input into scrambler and is scrambled first, and the original state of scrambler is randomly generated,
The value write-in signaling field A scrambler initialization fields of generation；
Step 21：Signaling field A scramblings terminate rear scrambler and are stopped, and scrambler current operating state are not preserved, i.e.,
The value of 7 bit shift registers is not preserved, sends the signaling field A after scrambling；
Step 22：Emitter insertion MBTF fields are transmitted；
Step 23：After having sent MBTF fields, the 8th input scrambler of signaling field B is scrambled, at the beginning of scrambler
Beginning state is randomly generated, the value write-in signaling field B scrambler initialization fields of generation；
Step 24：After signaling field B scramblings terminate, scrambler is worked on, and data division input scrambler is added
Disturb, then send data after scrambling；
Step 25：Receiver descrambling module is initial according to the signaling field A scramblers for receiving when signaling field A is received
Change field to be descrambled；
Step 26：After having descrambled signaling field A, descrambler is stopped, and descrambler current operating state is not preserved；
Step 27：Receiver receives MBTF fields, and the field is without descrambler；
Step 28：Receiver starts to receive signaling field B after having received MBTF fields, and descrambler is according to the signaling for receiving
Field B scrambler initialization fields are descrambled；
Step 29：After having descrambled signaling field B, descrambler works on reception data division, data division input descrambling
Device, can thus receive the data after descrambling.
Claims (8)
1. the frame in a kind of mimo wireless communication system is scrambled and de-scrambling method, it is characterised in that：Comprise the following steps：Generation bag
The frame of training sequence, signaling field and data division is included, the signaling field and data division are separately input in scrambler
Scrambled, wherein, signaling field includes the init state subfield of scrambler；Frame is sent to receiver by emitter,
Receiver descrambles according to the init state subfield received in signaling field to signaling field and data division；It is described
When mimo wireless communication system is Single User MIMO communication system, signaling field is signaling field A；The mimo wireless communication system
Unite during for multi-user MIMO communication system, signaling field is signaling field A and signaling field B；The signaling field A includes scrambler
Device init state subfield, SC/OFDM fields, bandwidth indication field, dynamic bandwidth field, sub- bandwidth field, length field,
STBC fields, packet number field, Aggregation field, space-time fluxion and local association indicator field, SU MCS fields, prelist code word
Section, power save field, HCS fields and reserved field；Signaling field B includes scrambler initialization mode field；MCS fields；
Length fields, reserved field and HCS fields.
2. the frame in mimo wireless communication system according to claim 1 is scrambled and de-scrambling method, it is characterised in that：In list
In user's MIMO communication system, it is to the method that signaling field and data division are scrambled：
Step 101：The 8th input scrambler of signaling field A, scrambler randomly generates init state, described to randomly generate
Scrambler initialization subfield in the value write-in signaling field A of init state；
Step 102：After signaling field A scramblings terminate, scrambler break-off, and current state is preserved, send the letter after scrambling
Make field A；
Step 103：Insertion millimeter wavelength training sequence is sent, and the millimeter wavelength training sequence is not scrambled；
Step 104：After having sent millimeter wavelength training sequence, data portion is continued according to the scrambler state for preserving before and is entered
Row scrambling, and send generated scrambled data.
3. the frame in mimo wireless communication system according to claim 1 is scrambled and de-scrambling method, it is characterised in that：Many
In user's MIMO communication system, it is to the method that the signaling field and data division are scrambled：
Step 201：The 8th input scrambler of signaling field A, scrambler randomly generates init state, described to randomly generate
Scrambler initialization subfield in the value write-in signaling field A of init state；
Step 202：After signaling field A scramblings terminate, scrambler is stopped, and does not preserve current state, sends the letter after scrambling
Make field A；
Step 203：Insertion millimeter wavelength training sequence is sent, and the millimeter wavelength training sequence is not scrambled；
Step 204：After sending millimeter wavelength training sequence, the 8th input scrambler of the signaling field B, scrambler is initial
Change state is randomly generated, the scrambler initialization subfield of the scrambler initialization state value write-in signaling field B for randomly generating；
Step 205：After signaling field B scramblings terminate, scrambler continues data portion and is scrambled, and sends the letter after scrambling
Make field B and data division.
4. the frame in mimo wireless communication system according to claim 1 is scrambled and de-scrambling method, it is characterised in that：In list
In user's MIMO communication system, it is to the method that signaling field and data division are descrambled：
Step 301：, from the 8th input descrambler, the init state of descrambler is according to before reception signaling field A 7 for signaling field A
Position scrambler initialization field is produced；
Step 302：After signaling field A descramblings terminate, descrambler break-off, and preserve current state；
Step 303：Millimeter wavelength training sequence is received, the millimeter wavelength training sequence does not descramble；
Step 304：After having received millimeter wavelength training sequence, data portion is continued according to the descrambler state for preserving before and is entered
Row descrambling, and receive generated descrambling data.
5. the frame in mimo wireless communication system according to claim 1 is scrambled and de-scrambling method, it is characterised in that：Many
In user's MIMO communication system, it is to the method that signaling field and data division are descrambled：
Step 401：, from the 8th input descrambler, the init state of descrambler is according to reception signaling field A's for signaling field A
Preceding 7 scrambler initialization fields are produced；
Step 402：After signaling field A descramblings terminate, descrambler is stopped, and does not preserve current state；
Step 403：Receive millimeter wavelength training sequence；
Step 404：After having received millimeter wavelength training sequence, the 8th input descrambler of signaling field B, descrambler initialization
State is produced according to the preceding 7 scrambler initialization fields for receiving signaling field B；
Step 405：After signaling field B descramblings terminate, descrambler is not stopped, and continues data portion and is descrambled, and connects
Receive generated descrambling data.
6. the frame in a kind of mimo wireless communication system using as described in claim 1-5 any one is scrambled and de-scrambling method
Communicator, it is characterised in that：Including：Processing system, transmitter and receiver, wherein,
The processing system is the processing system of transmitter terminal and the processing system of receiver end；The place of wherein described transmitter terminal
Reason system is used to generate includes the frame of training sequence, signaling field and data division, and by the signaling field and data division
It is separately input to be scrambled in scrambler, the processing system of the receiver end is used for the signaling field and data portion that will receive
It is separately input to be descrambled in descrambler；
The emitter, for frame to be sent into the receiver by channel；
The receiver, for receiving the frame that the emitter sends.
7. frame scrambling in mimo wireless communication system according to claim 6 and the communicator of de-scrambling method, it is special
Levy and be：The scrambler includes 7 bit shift registers and two XOR modules.
8. frame scrambling in mimo wireless communication system according to claim 6 and the communicator of de-scrambling method, it is special
Levy and be：The method for scrambling of the scrambler is：At the beginning of scrambler randomly generates 7 bit shift register init states, 7 first
The init state subfield of the scrambler in the value write-in signaling field of beginning state；Then 7 bit shift registers initialize shape
The 4th and the 7th in state carries out XOR, the 1st, the data input shift register of generation, and and input signaling field
Other fields or data division produce after XOR other fields or data division of the signaling field after scrambling.
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| CN104301278B (en) * | 2014-09-28 | 2017-11-28 | 江苏中兴微通信息科技有限公司 | A kind of zero filling method and device of mixed carrier wlan system |
| CN104363192B (en) * | 2014-10-21 | 2017-10-31 | 江苏中兴微通信息科技有限公司 | A kind of method of reseptance and device of the MIMO communication system of compatible a variety of frame formats |
| CN104580053B (en) * | 2014-12-02 | 2017-09-15 | 江苏中兴微通信息科技有限公司 | The receiving/transmission method and device of OFDMA technologies are realized in wideband wireless local area network |
| CN108347293B (en) * | 2017-01-24 | 2023-10-24 | 华为技术有限公司 | Transmission method and device |
| US20190132879A1 (en) * | 2018-03-21 | 2019-05-02 | Xiaogang Chen | Scrambler initialization for multi-user clear to send transmission |
| CN110545155A (en) * | 2018-05-29 | 2019-12-06 | 中兴通讯股份有限公司 | Partial pseudo-randomization processing method, corresponding device, equipment and storage medium |
| CN113572571B (en) * | 2020-04-29 | 2023-06-27 | 华为技术有限公司 | Data transmission method and device, chip system and computer readable storage medium |
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