A kind of method and device for improving signaling frame transmission robustness
Technical field
The present invention relates to the signaling frame transmission of millimeter wave ultrahigh speed wireless communication, is specifically that a kind of signaling frame that improves transmits Shandong
The method and device of rod, belongs to wireless communication system technologies field.
Background technology
Wireless communication spectrum resource is increasingly rare and the demand of very high-speed data transfer speed, millimeter wave frequency band ultrahigh speed without
Line communication technology increasingly attracts attention, and becomes one of technology most potential in future wireless system technology.
45GHz frequency ranges multiple-input and multiple-output (Multiple Input Multiple Output, MIMO) wireless communication skill
Art belongs to millimetre-wave attenuator technology, is applied towards ultrahigh speed wireless access etc., can realize the ultrahigh speed of equipment room 10Gbps without
Line transmits.Compared with low-frequency range, its feature includes millimeter wave:First, available spectral range is wide, channel capacity is big;It is second, easy
Realize narrow beam and the antenna of high-gain, thus high resolution, good in anti-interference performance.
Being operated in the signaling frame of 2.4GHz or 5.8GHz frequency ranges IEEE802.11n includes HT-SIG1 and HT-SIG2, HT-
The length of SIG1 and HT-SIG2 is all 24 bits, and the forward error correction BCC coding inputs of the system are also 24 bits, and signaling frame is
Map directly to the input terminal of BCC (Binary Convolutional Code, BCC) codings.
The signaling frame for being operated in 5.8GHz frequency range IEEE802.11ac single users (Single User, SU) mimo system is
VHT-SIG-A1 and VHT-SIG-A2, their length are all 24 bits, and the forward error correction BCC coding inputs of the system are also 24
Bit, signaling frame are the input terminals for mapping directly to BCC codings.
Being operated in the signaling frame of 5.8GHz frequency ranges IEEE802.11ac multi-user (Multi-user, MU) mimo system includes
VHT-SIG-A and VHT-SIG-B, its VHT-SIG-A is identical with Single User MIMO system, VHT-SIG-B length under 20MHz bandwidth
For 26 bits, VHT-SIG-B length is 27 bits under 40MHz bandwidth, 80MHz, 160MHz and 80+80MHz VHT-SIG-B long
Spend for 29 bits.They are all the input terminals for mapping directly to BCC codings.
One OFDM of above-mentioned signaling frame occupancy (Orthogonal Frequency Division Multiplexing,
OFDM symbol), the length of signaling frame and the input length of forward error correction coding are essentially the same, and signaling frame all maps directly to
The input terminal of BCC codings, it is relatively poor without mapping code gain or diversity gain, reliability.
The frame head for the OFDM physical layers being operated in 60GHz frequency range IEEE802.11ad standards is by using single
OFDM symbol encodes, its signaling message length is 64 bits, forward error correction LDPC (Low-density Parity-check
Codes, LDPC) input of code is 672 bits.Sequence q is produced after these signaling frame bit sequence b scramblers, sequence q passes through embedding
Enter 440 0 come obtain the sequence of 504 bits altogether for [q, 01×440],LDPC coding, then produce
Raw three combined sequences go out the LDPC code word sequence of 672 bits, and this method cannot give full play to the code correction of corresponding code length
Ability, performance is bad, the poor reliability of signaling frame transmission.
The length of the signaling frame A (SIG-A) of IEEE802.11aj (45GHz) Single User MIMO system is 72 bits,
When SIG-A is sent, the input of the forward error correction coding LDPC of its transmitter is 336 bits.
The signaling frame of IEEE802.11aj (45GHz) multi-user MIMO system includes SIG-A and signaling frame B (SIG-B),
SIG-A is as Single User MIMO system, the length of its SIG-B is 40 bits, when SIG-B is sent, before its transmitter
Input to Error Correction of Coding LDPC is 336 bits.
The length of above-mentioned signaling frame is much smaller than the input bit digit of forward error correction coding, and signaling frame is mapped to forward error correction
If coding is using the method being operated in 60GHz frequency range IEEE802.11ad standards, it is impossible to utilizes corresponding code length well
Coding gain or diversity gain.
The content of the invention
Goal of the invention:For problems of the prior art and deficiency, the present invention is a kind of to improve signaling frame transmission robust
Property method and device, for forward error correction coding input length at least 2 times of signaling message lengths when, preferably utilize short bit
The signaling frame of position is mapped to the diversity gain that the forward error correction coding input tape of long bit comes, and improves the reliable of signaling frame transmission
Property.
Technical solution:It is a kind of improve signaling frame transmission robustness method, first, before forward error correction coding to scrambling after
Signaling frame repeated, or carry out repeat plus negate, or repeat after change wherein filling 0 position, can also repeat plus take
Change the position of wherein filling 0 after anti-, so as to generate new signaling frame;Then, send and generate new signaling frame.
The above method is described in detail as follows:The length of the signaling frame of wireless communication system is L, forward error correction coding it is defeated
It is N, N >=2L to enter digit,
INT () represents round numbers part (formula 1)
I.e. M isInteger part,
F=N-LM (formula 2)
(1) signaling frame bit bit sequence b,
B=[b1,b2,...,bL] (formula 3)
Wherein L is the length of signaling frame, scrambled according to consensus standard signaling frame, since the 8th bit.Scramble postorder
It is as follows to arrange q:
Q=[q1,q2,...,qL] (formula 4)
(2) sequence D1It is the sequence that 0 acquisition N number of bit altogether is filled out after being repeated M times by sequence q:
D1=[X1,X2,...,Xi,...,XM,01×F] (formula 5)
Xi=q=[q1,q2,...,qL] 1≤i≤M (formula 6)
Wherein 01×FRepresent 1 × F 0;
(3) sequence c is to negate generation by sequence q:
C=[c1,c2,...,cL] (formula 7)
Wherein in formula 71≤i≤L (formula 8)
(4) sequence D2It is to be produced by the following formula:
D2=[X1,X2,...,Xi,...,XM,01×F] (formula 9)
1≤i≤M (formula 10)
(5) sequence D3It is by varying sequence D1The position of afterbody filling 0, between being distributed in sequence q by the 0 of filling,G=E+ (F-EM), the sequence of generation:
D3=[X1,01×E,X2,01×E,...,Xi,01×E,...,XM-1,01×E,XM,01×G] (formula 11)
Xi=q=[q1,q2,...,qL] 1≤i≤M (formula 12)
(6) sequence D4It is by varying sequence D2Afterbody fills out 0 position, and X is distributed in by the 0 of fillingiAnd Xi+1Between, produce
Sequence D4For:
D4=[X1,01×E,X2,01×E,...,Xi,01×E,...,XM-1,01×E,XM,01×G] (formula 13)
1≤i≤M (formula 14)
The forward error correction coder list entries D produced by above-mentioned steps1、D2、D3Or D4Digits long be N, so that it may
To directly input forward error correction coder.
The signaling frame includes the signaling frame A (SIG-A) of Single User MIMO wireless communication system.
The signaling frame includes the signaling frame A (SIG-A) and signaling frame B (SIG-B) of multiuser MIMO wireless communication system.
Described send includes by channel sending the signaling frame, wherein, the bandwidth of the channel be 540MHz or
1080MHz。
Described send includes sending the signaling frame by channel, wherein, the bandwidth of the channel is 540MHz, and its
In, the quantity of the subcarrier is 179.
Include 8 pilot sub-carriers, 3 direct current subcarriers and 168 numbers for the quantity of the subcarrier of the signaling frame
According to subcarrier.
Described send includes sending the signaling frame by channel, wherein, the bandwidth of the channel is 1080MHz, and
Wherein, the quantity of the subcarrier is 355.
Include 16 pilot sub-carriers, 3 direct current subcarriers and 336 numbers for the quantity of the subcarrier of the signaling frame
According to subcarrier.
A kind of device for improving signaling frame transmission robustness, including:
Processing system, for repeating the signaling frame after scrambling before forward error correction coding, or repeat plus take
Instead, or after repeating change the position of wherein filling 0, the position of wherein filling 0 can also be repeated plus change after negating, so as to generate
New signaling frame, is transferred to the coding module of transmitter;
Transmitter, for sending signaling frame to receiver;
Receiver, receiving signaling frame will first decode, and the output K of N number of bit is produced after decoding, then be adopted according to when sending
Repetition or the method for repeating plus negating and the position for filling 0, it is extensive as follows according to cyclic redundancy check mechanism
Appear again the signaling frame b of L:
(1) D is produced using the method for repetition when sending1, preceding L of the output K of N number of bit will be produced after decoding first
Data input descrambler carry out descrambling and produce signaling frame b, verified according to check field, if verification is correct, produced
Correct signaling frame b has been given birth to, the subsequent data of K has not been reprocessed;If verification is incorrect, by the data of the 2nd section L of K
Input descrambler carries out descrambling and produces signaling frame b, is verified according to check field, if verification is correct, generates just
True signaling frame b, does not reprocess the subsequent data of K;According to verification situation, the above process repeats M times;
(2) D is produced using the method for repeating plus negating when sending2, the output K of N number of bit will be produced after decoding first
The input descrambler of the data of preceding L carry out descrambling and produce signaling frame b, verified according to check field, if verification is just
Really, then correct signaling frame b is generated, the subsequent data of K is not reprocessed;If verification is incorrect, to the 2nd section L of K
Data first negate, then input descrambler and carry out descrambling and produce signaling frame b, verified according to check field, if school
Test correctly, then subsequent data is not reprocessed;According to verification situation, the above process repeats M times, when wherein M is odd number, M
The data of section L directly input descrambler;When M is even number, descrambler is inputted after the data-conversion of M sections L;
(3) using change sequence D when sending1The location method of afterbody filling 0 produces D3, it recovers the process of signaling frame b
It is similar with step (1), unlike, simply need to get rid of the 0 of filling, no longer specifically describe.
(4) using change sequence D when sending2The location method of afterbody filling 0 produces D4, it recovers the process of signaling frame b
It is similar with step (2), unlike, simply need to get rid of the 0 of filling, no longer specifically describe.
Beneficial effect:Compared with prior art, it is provided by the invention it is a kind of improve signaling frame transmission robustness method and
Device, by being repeated before forward error correction coding to the signaling frame after scrambling, or repeats plus negates, can also change filling
The method of the raising signaling frame transmission robustness of 0 position, can be mapped to long bit using the signaling frame of short bit well
The diversity gain that the forward error correction coding input tape of position comes, then according to the repetition used when sending or the method for repeating plus negating
And the position of filling 0, with reference to cyclic redundancy check mechanism, the signaling frame b of L is recovered, side that can be than IEEE802.11ad
Method preferably improves signaling frame transmission reliability, at the same can allow the transmission of signaling frame use than IEEE802.11n and
The QPSK modulation of IEEE802.11ac complexity.
Brief description of the drawings
Fig. 1 is the schematic diagram of the cordless communication network of application of the embodiment of the present invention;
Fig. 2 is the exemplary transmitter block diagram of the SIG-A of IEEE802.11aj (45GHz) system OFDM physical layers;
Fig. 3 is the exemplary transmitting of the SIG-B of IEEE802.11aj (45GHz) multi-user MIMO system OFDM physical layers
Machine frame figure;
Fig. 4 is the exemplary plot that IEEE802.11aj (45GHz) systems SIG-A is mapped to forward error correction coding LDPC inputs;
Fig. 5 is the exemplary plot that IEEE802.11aj (45GHz) systems SIG-B is mapped to forward error correction coding LDPC inputs;
Fig. 6 is the example arrangement form of SIG-A;
Fig. 7 is the example arrangement form of SIG-B.
Embodiment
With reference to specific embodiment, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate the present invention
Rather than limit the scope of the invention, after the present invention has been read, various equivalences of the those skilled in the art to the present invention
The modification of form falls within the application appended claims limited range.
The method for improving signaling frame transmission robustness, first, carries out the signaling frame after scrambling before forward error correction coding
Repeat, or repeat plus negate, or change the position of wherein filling 0 after repeating, can also repeat plus change wherein after negating
The position of filling 0, so as to generate new signaling frame;Then, send and generate new signaling frame.
The device of signaling frame transmission robustness is improved, including:
Processing system, for repeating the signaling frame after scrambling before forward error correction coding, or repeat plus take
Instead, or after repeating change the position of wherein filling 0, the position of wherein filling 0 can also be repeated plus change after negating, so as to generate
New signaling frame, is transferred to the coding module of transmitter;
Transmitter, for sending signaling frame to receiver;
Receiver, receiving signaling frame will first decode, and the output K of N number of bit is produced after decoding, then be adopted according to when sending
Repetition repeats plus the method that negates and the position for filling 0, with reference to cyclic redundancy check mechanism, recovers the letter of L
Make frame b.
Methods and apparatus of the present invention is preferably mapped to the forward error correction of long bit using the signaling frame of short bit
The diversity gain that coding input is brought, improves the reliability of signaling frame transmission.Below in conjunction with the accompanying drawings, the embodiment of the present invention is carried out
Detailed elaboration.
The technology of the present invention can be used for various system of broadband wireless communication, and the example of this communication system includes millimeter wave
Ultrahigh speed wireless communication system etc..
The method of the present invention may be implemented in various wired or wireless devices, the wireless section that the method according to the invention is realized
Point can include access point or access terminal.
Access point (Access Point, AP) can include, be implemented as or for 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 for access terminal, subscriber station, use
Family unit, movement station, user terminal, user apparatus, user equipment or some other terms.In some implementations, access
Terminal can include possessing phone, mobile phone, computer of wireless connection capability etc..
As shown in Figure 1, the multiple-access MIMO system with access point and user terminal.Any given at the time of, access point
It can communicate on the downlink and uplink with one or more user terminals.Downlink be from access point to
The communication link of family terminal, uplink are the communication links 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 is provided to access point and coordinate and control.
System can use 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 (TDD) system or frequency division duplex (FDD) system.For TDD system, downlink chain
Road and uplink share identical frequency band.For FDD system, downlink and uplink use different frequency bands.MIMO
System can also be transmitted using single carrier or multicarrier.
As shown in Fig. 2, in the communication system SIG-A of OFDM physical layers transmitter block diagram, it includes following 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 multiple540MHz for1080MHz 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 are inserted into protection interval and adding window
10) Analog and RF simulations and radio-frequency module
As shown in figure 3, in multi-user MIMO system the SIG-B of OFDM physical layers transmitter block diagram, it includes such as lower die
Block:
1) PHY padding physical layers zero padding
2) Scrambler scramblers
3) Replicate over multiple540MHz for1080MHz 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 are inserted into protection interval and adding window
12) Analog and RF simulations and radio-frequency module
Above-mentioned SIG-A transmitters are mapped to forward error correction LDPC coding inputs after scrambler module can use such as lower section
Method, its mapping process can be shown according to Fig. 4.
The SIG-A of the OFDM physical layers of IEEE802.11aj (45GHz) Single User MIMO wireless communication system is by making
Encoded with 2 OFDM symbols, the bit bit sequence b=[b of SIG-A1,b2,...,bL], length is 72 bits, L=72, its
The input of the forward error correction coding LDPC of transmitter is 336 bits, according to above formula, N=336, M=4, F=48.Through
Sequence q=[the q produced are crossed after scrambling module1,q2,...,q72], to q sequences negate the sequence c=[c of generation1,
c2,...,c72], ciIt is to qiNegate, such as qi=0, then ci=1;qi=1, then ci=0.So reflected by what is repeated plus negate
Shooting method produce forward error correction coding list entries D be:
D=[q, c, q, c, 01×48] (formula 15)
SIG-A is first decoded after receiver receives signaling frame, and the output K of 336 bits is produced after decoding, first to decoding
The input descrambler of the data of first 72 of the output K of 336 bits of generation carries out descrambling and produces signaling frame b afterwards, according to school
Test field to be verified, if verification is correct, generates correct signaling frame b, the subsequent data of K is not reprocessed;If
Verify incorrect, then the data of the 2nd section 72 of K first negated, then input descrambler and carry out descrambling and produce signaling frame b,
Verified according to check field, if verification is correct, generates correct signaling frame b, the subsequent data of K is no longer located
Reason;According to verification situation, the above process repeats 4 times.
The other repetitions of SIG-A and change zero filling position mapping method and how to receive and recover correct signaling frame
Method it is similar with the above process, no longer specific example describe.
IEEE802.11aj (45GHz) multi-user MIMO system, SIG-A transmitters be mapped to after scrambler module before to
The method of error correction LDPC coding inputs and how to receive the method for recovering correct signaling frame and Single User MIMO system one
Sample, no longer specifically describes.
As shown in figure 5, the SIG-B transmitters of IEEE802.11aj (45GHz) multi-user MIMO system are in scrambler module
The method of forward error correction LDPC coding inputs is mapped to afterwards.
The SIG-B of the OFDM physical layers of multi-user MIMO system is encoded by using two OFDM symbols, SIG-B's
Bit b=[b1,b2,...,b40], length is 40 bits, L=40, the input of the forward error correction coding LDPC of its transmitter
For 336 bits, according to above formula, N=336, M=8, F=16, E=2, produce after the scrambled device modules of G=2
Sequence is q=[q1,q2,...,q40], repeat to change the forward error correction coding list entries that the mapping method for the position for filling out 0 produces
D is:
D=[q, 01×2,q,01×2,q,01×2,q,01×2,q,01×2,q,01×2,q,01×2,q,01×2] (formula 16)
Receiver first decodes after receiving signaling frame SIG-B, and the output K of 336 bits is produced after decoding, first to decoding
The input descrambler of the data of first 40 of the output K of 336 bits of generation carries out descrambling and produces signaling frame b afterwards, according to school
Test field to be verified, if verification is correct, generates correct signaling frame b, the subsequent data of K is not reprocessed;If
Verify incorrect, then the data of the 2nd section 40 are taken behind the 0 of 40 data of removal first segment to K and 2 fillings, by the data
Input descrambler carries out descrambling and produces signaling frame b, is verified according to check field, if verification is correct, generates just
True signaling frame b, does not reprocess the subsequent data of K;According to verification situation, the above process repeats 8 times.
The other repetitions of SIG-B, which add, to be negated, and can also be changed the mapping method for the position for filling out 0 and how to be received and recovers just
The method of true signaling frame is similar with the above process, and no longer specific example describes.
As shown in fig. 6, the example arrangement of the SIG-A of the communication system.SIG-A can include scrambler initialization state
7 bits, provide descrambling to receiver and use, also indicate 1 bit comprising bandwidth, instruction system air interface transmission bandwidth is
540MHz or 1080MHz, further includes the check field CRC of 16 bits, and other fields do not specifically describe herein, SIG-
A length is 72 bits.
Fig. 7 shows the example arrangement of the SIG-B of the communication system.SIG-B can include scrambler initialization state 7
Bit, provides descrambling to receiver and uses;18 bits of length field, indicate the byte number of PSDU, further include 16 ratios
The check field HCS of special position, other fields do not specifically describe herein, and the length of SIG-B is 40 bits.
Transmitter is configured to send the signaling frame by channel, wherein, the bandwidth of the channel for 540MHz or
1080MHz.When the bandwidth of the channel is 540MHz, the quantity of the subcarrier be 179, including 8 pilot sub-carriers, 3
Direct current subcarrier and 168 data subcarriers.
Transmitter is configured to send the signaling frame by channel, 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
A data subcarrier.
The signaling frame of the short bit of single carrier physical layer of IEEE802.11aj (45GHz) system is mapped to long bit
The method of forward error correction coding is similar with OFDM physical layers, and no longer specific example describes here.