CN103001729B - A kind of code modulating method and relevant apparatus - Google Patents
A kind of code modulating method and relevant apparatus Download PDFInfo
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Abstract
The embodiment of the invention discloses a kind of code modulating method and relevant apparatus, for avoiding the erroneous judgement problem caused owing to crc error rate is higher. The method comprise the steps that in process packet being encoded and modulate, the modulation system that B signaling VHT-SIG-B field that the superelevation in described packet the is handled up CRC crc field use corresponding with described VHT-SIG-B field is identical; Additionally, present invention also offers the relevant apparatus realizing said method.
Description
Technical field
The present invention relates to the communications field, especially a kind of code modulating method of design and relevant apparatus.
Background technology
Due to the existence of interference and noise in channel circumstance so that data transmission often exists certain error probability. In order to reduce this transmission error probability as much as possible, it will usually carry out chnnel coding at transmitter and add CRC (CRC, CyclicRedundancyCheck) protection operation.
Chnnel coding refers to and adds certain redundant bit in data bit so that by decoded operation, the reception correct probability of data can be improved at receiving terminal. Receiving terminal is by decoding the information bit recovering to send. Code check reflection cataloged procedure in add redundancy number, code check=information bit/(information bit+redundant bit number), the more low then error correcting capability of code check is more strong, but expense is more big.
Add CRC protection to refer to after information bit, increase some bits, these bits produce to associate according to the rule that sending and receiving end consults with information bit before, again CRC is produced according to rule according to the information bit received at receiving terminal, contrast with the CRC being an actually-received, if the two is completely the same, then it is assumed that it is right that this packet solves completely; Otherwise this packet thinks reception mistake.
In the packet of prior art WLAN, for 802.11ac, superelevation at packet is handled up B signaling (VHT-SIG-B, VeryhighthroughputsignalB) field adopts binary phase shift keying (BPSK, BinaryPhaseShiftKeying) modulation, 1/2 code check convolutional encoding. Data (Data) field adopts variable coding and modulation system, and modulation system can from BPSK to 256 quadrature amplitude modulation (QAM, QuadratureAmplitudeModulation), and code check is from 1/2 to 5/6. In 802.11ac, CRC corresponding for VHT-SIG-B is placed on service (SERVICE) field, with the CRC check position as VHT-SIG-B of 8 bits in SERVICE field.
When packet is demodulated and decodes by receiving terminal, if the solution of VHT-SIG-B field is in harmonious proportion decoding correctly, when crc field is demodulated or decodes appearance mistake, then the CRC check of VHT-SIG-B field cannot be passed through, and be code modulation mode and data length necessary to demodulation Data due to what VHT-SIG-B field was carried, therefore, once think that the CRC check of VHT-SIG-B field cannot be passed through, so go the Data field demodulated below also can make mistakes by information such as the code modulation modes of mistake, as long as so the CRC check of VHT-SIG-B is failed, just terminate the reception process of whole packet.
But, owing to prior art is that the crc field of VHT-SIG-B field He its correspondence is encoded respectively and is modulated, VHT-SIG-B field adopts BPSK modulation, 1/2 code check convolutional encoding. And crc field adopts identical code modulation mode with Data field, and the coded modulation exponent number of Data field (coded modulation exponent number and code modulated accuracy are inversely proportional to) is generally higher than VHT-SIG-B, even if the demodulation coding being therefore likely to occur the CRC check of VHT-SIG-B is made mistakes, and Data field below is correct situation, in this case, abandoning all of data below is very big waste.
Summary of the invention
Embodiments provide a kind of code modulating method and relevant apparatus, for avoiding the erroneous judgement problem caused owing to crc error rate is higher.
Code modulating method provided by the invention, including: in process packet being encoded and modulate, the modulation system that B signaling VHT-SIG-B field that the superelevation in described packet the is handled up CRC crc field use corresponding with described VHT-SIG-B field is identical.
Demodulation coding method provided by the invention, including: receive packet; When described packet is demodulated and decodes, ignore the function of crc field corresponding with VHT-SIG-B field in described packet, make demodulation or the decoding correctness of no matter described crc field, all proceed the solution of the data DATA field in described packet and be in harmonious proportion decoding.
Code modulating method provided by the invention, including: when packet being encoded and modulating, abandon the crc field that in described packet, VHT-SIG-B field is corresponding, make when receiving terminal is demodulated and decodes, the no matter demodulation of described VHT-SIG-B field or decoding correctness, all proceeds the solution of the data DATA field in described packet and is in harmonious proportion decoding.
Code modulation device provided by the invention, including: modulating unit, for, in process packet being encoded and modulate, using identical modulation system that the crc field that the VHT-SIG-B field in the packet needing transmission is corresponding with described VHT-SIG-B field is modulated.
Demodulation coding device provided by the invention, including: receive unit, be used for receiving packet; Demodulation coding unit, for described packet is demodulated and decodes, and ignore the function of crc field corresponding with VHT-SIG-B field in described packet, make demodulation or the decoding correctness of no matter described crc field, all proceed the solution of the data DATA field in described packet and be in harmonious proportion decoding.
Code modulation device provided by the invention, including: CRC discarding unit, for when packet being encoded and modulating, abandon the crc field that in described packet, VHT-SIG-B field is corresponding, make when receiving terminal is demodulated and decodes, the no matter demodulation of described VHT-SIG-B field or decoding correctness, all proceeds the solution of the data DATA field in described packet and is in harmonious proportion decoding.
As can be seen from the above technical solutions, the embodiment of the present invention has the advantage that and present invention, avoiding the erroneous judgement problem caused owing to crc error rate is higher, thus decreasing the expense that packet is processed.
Accompanying drawing explanation
Fig. 1 is a schematic flow sheet of code modulating method in the embodiment of the present invention;
Fig. 2 is a data structural representation of packet in the embodiment of the present invention;
Fig. 3 is another schematic flow sheet of code modulating method in the embodiment of the present invention;
Fig. 4 is another schematic flow sheet of code modulating method in the embodiment of the present invention;
Fig. 5 is another data structure schematic diagram of packet in the embodiment of the present invention;
Fig. 6 is another data structure schematic diagram of packet in the embodiment of the present invention;
Fig. 7 is another schematic flow sheet of code modulating method in the embodiment of the present invention;
Fig. 8 is a structural representation of code modulation device in the embodiment of the present invention;
Fig. 9 is another structural representation of demodulation coding device in the embodiment of the present invention.
Detailed description of the invention
Embodiments provide a kind of code modulating method and relevant apparatus, for avoiding the erroneous judgement problem caused owing to crc error rate is higher.
In the embodiment of the present invention, an embodiment of code modulating method includes:
In process packet being encoded and modulate, the modulation system that B signaling VHT-SIG-B field that the superelevation in this packet the is handled up CRC crc field use corresponding with this VHT-SIG-B field is identical.
Referring to Fig. 1, in the embodiment of the present invention, another embodiment of code modulating method includes:
101, code modulation device carries out the group bag of packet;
In a wireless local area network, the packet that will send is packaged by code modulation device, this packet includes: training sequence field, control message field and Physical Layer Service Data combines (PSDU, PhysicallayerServiceDataUnit) field.
This training sequence field synchronizes and channel estimating for the signal of this packet;
In actual applications, code modulation device can be a website of WLAN.
This PSDU field is the concrete data content that this packet comprises, and includes SERVICEfield field and Data field; This Data field can by multiple media access control protocol data unit (MPDU, MacProtocolDataUnit) it is polymerized, wherein, each MPDU is considered as a relatively independent data sub-element, when error of transmission occurs 1 MPDU, only this MPDU can be retransmitted, retransmit without to all MPDU.
This control message field is for the control message of this packet of labelling, and wherein, this control message field includes VHT-SIG-B field, and this VHT-SIG-B field kind is marked with the information such as code modulation mode and data length necessary to demodulation subsequent data part.
In the process of group bag, code modulation device needs above-mentioned VHT-SIG-B field and Data field are added CRC protection, and CRC check code corresponding to VHT-SIG-B field can be put in the crc field of above-mentioned SERVICEfield field; Concrete data structure is referred to Fig. 2.
102, the VHT-SIG-B field in packet is encoded and modulates by code modulation device;
VHT-SIG-B field in above-mentioned packet is encoded and modulates by code modulation device, and wherein, VHT-SIG-B field is encoded as independent encoding block and modulates; The mode of modulation can be: BPSK, QPSK (QPSK, QuadraturePhaseShiftKeying) or 16QAM; The mode of coding can be: 1/2 convolutional encoding, 2/3 convolutional encoding or 3/4 convolutional encoding.
103, code modulation device uses the modulation system identical with VHT-SIG-B field that the crc field in packet is modulated.
Crc field in above-mentioned SERVICEfield is encoded and modulates by code modulation device, and wherein, when this crc field is modulated, the modulation system that code modulation device uses is identical with the modulation system of above-mentioned VHT-SIG-B field.
Optionally, in order to avoid the physical layer architecture of available data bag is made too many change, the embodiment of the present invention is when being encoded crc field and modulating, although using the modulation system identical with above-mentioned VHT-SIG-B field, but, can be the same with existing 802.11ac, it is placed in one and same coding block by crc field with the Data field in packet be encoded and modulate, this crc field uses identical code check to be encoded with Data field, and namely the crc field of VHT-SIG-B field and its correspondence is independently encoded and modulates.
Due to the modulation system that the crc field use that the VHT-SIG-B field in the embodiment of the present invention packet to WLAN is corresponding with VHT-SIG-B field is identical, therefore, recipient is when being demodulated VHT-SIG-B field and this crc field decoding, accuracy is close, make when the demodulation coding of the CRC check of VHT-SIG-B is made mistakes, the probability that the demodulation coding of Data field below is also made mistakes increases, and improves the practicality of crc field.
In order to improve crc field similarity of success rate when demodulation coding of VHT-SIG-B field and its correspondence further, the invention provides corresponding technical scheme, specifically refer to Fig. 3, in the embodiment of the present invention, another embodiment of code modulating method includes:
301, code modulation device carries out the group bag of packet;
In a wireless local area network, the packet that will send is being packaged by code modulation device, includes in this packet: training sequence field, controls message field and PSDU field.
SERVICEfield field includes the crc field that reserved (Reserved) field, scrambler initialization (ScramblerInit) field are corresponding with VHT-SIG-B field in embodiments of the present invention.
This ScramblerInit field is for the original state position of labelling scrambler so that receiving terminal can use this original state position to unscramble in follow-up descrambling procedure.
Optionally; in the process that this packet is packaged; in order to further ensure that this packet is demodulated the accuracy of decoding by receiving terminal, the code modulation device of transmitting terminal can also use above-mentioned crc field that this ScramblerInit field adds CRC protection.
302, the VHT-SIG-B field in packet is encoded and modulates by code modulation device;
The content of the step 302 in the present embodiment is identical with the content of step 102 in the embodiment shown in earlier figures 1, repeats no more herein.
303, code modulation device uses the coding identical with VHT-SIG-B field and modulation system the crc field in packet is encoded and modulates.
Crc field in above-mentioned SERVICEfield is encoded and modulates by code modulation device, wherein, when carrying out this crc field coding and modulation, the coding that code modulation device uses is identical with modulation system with the coding of above-mentioned VHT-SIG-B field with modulation system.
In embodiments of the present invention, the crc field of VHT-SIG-B field and its correspondence not only uses identical modulation system, and use identical coded system, make the code modulated process of two parts more close, thus further improve crc field similarity of success rate when demodulation coding of VHT-SIG-B field and its correspondence.
The present invention is it is also possible that the crc field of VHT-SIG-B field and its correspondence is encoded in same encoding block, make VHT-SIG-B field consistent with the crc field of its correspondence success rate when demodulation coding, specifically referring to Fig. 4, in the embodiment of the present invention, another embodiment of code modulating method includes:
401, code modulation device carries out the group bag of packet;
In a wireless local area network, the packet that will send is being packaged by code modulation device, includes in this packet: training sequence field, controls message field and PSDU field.
In the process that this packet is packaged, for the ease of code modulation device, the crc field of VHT-SIG-B field and its correspondence is put into one and same coding district be encoded and modulate, crc field corresponding for VHT-SIG-B field can be put into VHT-SIG-B field by code modulation device, and concrete data structure is referred to Fig. 5;
Optionally, further two-part for original VHT-SIG-B and SERVICEfield field can also be merged into a field to be operated, also serve as the part controlling message by original SERVICEfield field, concrete data structure is referred to Fig. 6. In the data structure of Fig. 5 and Fig. 6, Tail is tail bit field, as the latter end of a field.
402, the crc field of VHT-SIG-B field and its correspondence is encoded simultaneously and modulates by code modulation device.
Code modulation device by crc field corresponding for VHT-SIG-B field and its data protected (in group packet procedures; if ScramblerInit field is not included in the protection of this crc field by code modulation device; then " its data protected " are only VHT-SIG-B field; if having, then " its data protected " are VHT-SIG-B field and ScramblerInit field).
Concrete, data, crc field and Tail field that crc field is protected by code modulation device are placed in an encoding block and are encoded and modulate, and the data in this encoding block all use identical modulation system and coded system. Modulation system can include BPSK, QPSK or 16QAM; Coded system can include 1/2 convolutional encoding, 2/3 convolutional encoding or 3/4 convolutional encoding. CRC adopts N-bit, and N value can be 4,8 or 16. The length of VHT-SIG-B is likely M orthogonal frequency division multiplexi (OFDM, Orthogonalfrequency-divisionmultiplexing) symbol, and M can be 1 or 2.
Optionally, if two-part for original VHT-SIG-B and SERVICEfield field is merged into a field and is operated by the process of above-mentioned group of bag, then code modulation device can putting into VHT-SIG-B and the SERVICEfield (including there being Reserved field, the ScramblerInit field crc field corresponding with VHT-SIG-B field) after merging an encoding block in conjunction with field and be encoded and modulate, the data in this encoding block all use identical modulation system and coded system.
The above is the crc field problem that success rate is inconsistent when demodulation coding processing VHT-SIG-B field and its correspondence from the angle of transmitting terminal, from the angle of receiving terminal, corresponding scheme is proposed below, referring to Fig. 7, in the embodiment of the present invention, another embodiment of code modulating method includes:
Receive the packet transmitted in a wireless local area network; When this packet is demodulated and decodes, ignore the function of crc field corresponding with VHT-SIG-B field in this packet, make demodulation or the decoding correctness of no matter this crc field, all proceed the solution of the data DATA field in this packet and be in harmonious proportion decoding.
701, demodulation coding device receives the packet transmitted in a wireless local area network;
The packet that the demodulation coding device of demodulation coding device receiving end/sending end sends, includes in this packet: training sequence field, controls message field and PSDU field.
In actual applications, demodulation coding device can be a website of WLAN.
This control message field is for the control message of this packet of labelling, and wherein, this control message field includes VHT-SIG-B field, and this VHT-SIG-B field kind is marked with the information such as code modulation mode and data length necessary to demodulation subsequent data part; Wherein, VHT-SIG-B field adds the crc field of CRC protection in the SERVICEfield field of PSDU field.
702, the VHT-SIG-B field in packet is demodulated and decodes by demodulation coding device;
VHT-SIG-B field in packet is demodulated and decodes by demodulation coding device, after decoding completes, demodulation coding device receives the data symbol part in this packet, and by confirming that the decoding correctness of VHT-SIG-B field judges that whether received data bag effective, if invalid, then this packet reception failure; If effectively, then continuing triggered step 703 SERVICEfield field is demodulated and is decoded.
703, the SERVICEfield field in packet is demodulated and decodes by demodulation coding device;
SERVICEfield field in packet is demodulated and decodes by demodulation coding device, it is in harmonious proportion in decoding ground process solving, ignore the function of crc field corresponding with VHT-SIG-B field in this packet, make demodulation or the decoding correctness of no matter this crc field, all continues the triggered step 704 solution to the Data field in this packet and be in harmonious proportion and decode.
704, the Data field in packet is demodulated and decodes by demodulation coding device.
Data field in packet is demodulated and decodes by demodulation coding device, Data field solve mediation decoding complete after, demodulation coding device decoded out to this Data field again through the CRC check code that Data field is corresponding after data proofread, confirm errorless after, the reception of this packet success.
In embodiments of the present invention, in order to avoid the situation of the packet discard that leads to errors because crc field success rate when demodulation coding of VHT-SIG-B field He its correspondence is inconsistent, when SERVICEfield field is demodulated and decodes, directly ignore the effect of CRC word corresponding to wherein VHT-SIG-B field, make demodulation or the decoding correctness of no matter this crc field, all continue the solution to the Data field in this packet and be in harmonious proportion decoding. In embodiments of the present invention, sacrifice the detection function to follow-up Data field when SERVICEfield field is demodulated and is decoded, the CRC check code that task whether correct for inspection Data field gives Data field corresponding entirely is completed.
Wherein, optionally, when SERVICEfield field is demodulated and decodes by above-mentioned steps 703, if the demodulation of crc field or decoding failure, then trigger and judge the coded modulation (MCS that in packet, SERVICEfield field adopts, ModulationandCodingScheme) exponent number whether step more than N, if this coded modulation exponent number is more than N, just triggering the step of the function ignoring crc field corresponding with VHT-SIG-B field in packet, N is any integer between 0 to 8; If this coded modulation exponent number is less than or equal to N, then as existing 802.11ac, the CRC check failure of confirmation VHT-SIG-B field above, terminate the process that packet receives.
MCS exponent number has 10 kinds, and MCS exponent number is more high, then, under identical SNR (signal to noise ratio, Signal-noiseratio), bit signal to noise ratio (Eb/No) is more low.
For SNR=0dB (dB: decibel):
For MCS=0, now corresponding coded modulation is have 1 (BPSK) �� 1/2 (R)=1/2 information bit in 1/2, BPSK, 1 symbol, then Eb/No=0-10*log10(1/2)=3dB.
For MCS=1, now corresponding coded modulation is have 2 (QPSK) �� 1/2 (R)=1 information bit in 1/2, QPSK, 1 symbol, then Eb/No=0-10*log10(1)=0dB.
For MCS=6, now corresponding coded modulation is have 6 (64QAM) �� 3/4 (R)=4.5 information bit in 1/2, QPSK, 1 symbol, then Eb/No=0-10*log10(4.5)=-6.5dB.
It will be seen that due to Eb/No=SNR-10*log10(N), N is the information bit comprised in each modulation symbol, and owing to MCS exponent number is more high, then N value is more big, and bit signal to noise ratio is more low, and the accuracy now transmitted is also more low.
Adjustable according to practical situation, in the present invention, the exponent number N of MCS could be arranged to 0 to 8 (9 kinds) any one value.
In the embodiment of the present invention, another embodiment of code modulating method includes:
When the packet of WLAN is encoded and modulates, abandon the crc field that in described packet, VHT-SIG-B field is corresponding, make when receiving terminal is demodulated and decodes, the no matter demodulation of VHT-SIG-B field or decoding correctness, all proceeds the solution of the data Data field in this packet and is in harmonious proportion decoding.
Below the embodiment of the code modulation device of the present invention for performing above-mentioned code modulating method being illustrated, its logical structure refer to Fig. 8, and in the embodiment of the present invention, an embodiment of code modulation device includes:
Modulating unit 801, for, in process packet being encoded and modulate, using identical modulation system that the crc field that the VHT-SIG-B field in the packet needing transmission is corresponding with VHT-SIG-B field is modulated.
Website in the embodiment of the present invention can further include:
Coding unit 802, for using identical coded system that the crc field that the VHT-SIG-B field in the packet needing transmission is corresponding with described VHT-SIG-B field is encoded.
CRC generation unit 803, for when using CRC that above-mentioned packet is protected, also using crc field to protect the ScramblerInit field in this packet.
Encoding block allocation units 804, it is combined into an encoding block for described crc field is closed described VHT-SIG-B field, or the SERVICEfield field in described VHT-SIG-B field and described packet is combined into an encoding block, and after completing encoding block distribution, trigger described coding unit 802.
The interaction that in embodiment of the present invention code modulation device, unit is concrete is as follows:
In a wireless local area network, the packet that will send is packaged by code modulation device, includes in this packet: training sequence field, controls message field and PSDU field.
This training sequence field synchronizes and channel estimating for the signal of this packet;
This PSDU field is the concrete data content that this packet comprises, and includes SERVICEfield field and Data field; This Data field can by multiple media access control protocol data unit (MPDU, MacProtocolDataUnit) it is polymerized, wherein, each MPDU is considered as a relatively independent data sub-element, when error of transmission occurs 1 MPDU, only this MPDU can be retransmitted, retransmit without to all MPDU.
This control message field is for the control message of this packet of labelling, and wherein, this control message field includes VHT-SIG-B field, and this VHT-SIG-B field kind is marked with the information such as code modulation mode and data length necessary to demodulation subsequent data part.
In the process of group bag, code modulation device needs above-mentioned VHT-SIG-B field and Data field are added CRC protection, and CRC check code corresponding to VHT-SIG-B field can be put in the crc field of above-mentioned SERVICEfield field; Concrete data structure is referred to Fig. 2.
Optionally, in the process adding CRC protection, CRC generation unit 803 uses crc field that the ScramblerInit field in this packet and VHT-SIG-B field are protected.
After completing the group bag of packet, fields different in this packet is encoded the distribution of block by encoding block allocation units 804. Optionally, crc field can be combined into an encoding block in conjunction with this VHT-SIG-B field by encoding block allocation units 804, or the SERVICEfield field in VHT-SIG-B field and described packet is combined into an encoding block, and after completing encoding block distribution, trigger described coding unit 802 and use identical coded system that the crc field that the VHT-SIG-B field in the packet needing transmission is corresponding with described VHT-SIG-B field is encoded. After completing coding, modulating unit 801 uses identical modulation system that the crc field that the VHT-SIG-B field in the packet needing transmission is corresponding with VHT-SIG-B field is modulated.
Below the embodiment of the demodulation coding device of the present invention for performing above-mentioned demodulation coding method being illustrated, its logical structure refer to Fig. 9, and in the embodiment of the present invention, an embodiment of demodulation coding device includes:
Receive unit 901, for receiving the packet transmitted in a wireless local area network;
Demodulation coding unit 902, for described packet is demodulated and decodes, and ignore the function of crc field corresponding with VHT-SIG-B field in described packet, make demodulation or the decoding correctness of no matter this crc field, all proceed the solution of the data DATA field in this packet and be in harmonious proportion decoding.
Demodulation coding device in the embodiment of the present invention can further include:
Judging unit 903, for ignore crc field corresponding with VHT-SIG-B field in packet at demodulation coding unit function before, judge that whether coded modulation exponent number that in described packet, SERVICEfield field adopts is more than N, if, then triggering the step of the function ignoring crc field corresponding with VHT-SIG-B field in packet described in demodulation coding unit, described N is any integer between 0 to 8; If it is not, then stop the mediation decoding of the solution to described packet.
The interaction that in embodiment of the present invention demodulation coding device, unit is concrete is as follows:
The packet that the demodulation coding device receiving unit 901 receiving end/sending end of demodulation coding device sends, includes in this packet: training sequence field, controls message field and PSDU field. This control message field is for the control message of this packet of labelling, and wherein, this control message field includes VHT-SIG-B field, and this VHT-SIG-B field kind is marked with the information such as code modulation mode and data length necessary to demodulation subsequent data part; Wherein, VHT-SIG-B field adds the crc field of CRC protection in the SERVICEfield field of PSDU field.
After receiving above-mentioned packet, VHT-SIG-B field in packet is demodulated and decodes by demodulation coding unit 902, after decoding completes, demodulation coding device receives the data symbol part in this packet, and by confirming that the decoding correctness of VHT-SIG-B field judges that whether received data bag effective, if invalid, then this packet reception failure; If effectively, then continuing SERVICEfield field is demodulated and is decoded. Decode in ground process SERVICEfield field solution is in harmonious proportion, ignore the function of crc field corresponding with VHT-SIG-B field in this packet, make demodulation or the decoding correctness of no matter this crc field, all continue the solution to the Data field in this packet and be in harmonious proportion decoding.
Wherein, optionally, above-mentioned SERVICEfield field is demodulated and decodes time, if the demodulation of crc field or decoding failure, then trigger judging unit 903 and judge MCS exponent number that in packet, SERVICEfield field adopts whether step more than N, if this coded modulation exponent number is more than N, just triggering the step of the function ignoring crc field corresponding with VHT-SIG-B field in packet, N is any integer between 0 to 8; If this coded modulation exponent number is less than or equal to N, then as existing 802.11ac, the CRC check failure of confirmation VHT-SIG-B field above, terminate the process that packet receives.
Below the embodiment of the code modulation device of the present invention for performing above-mentioned demodulation coding method being illustrated, in the embodiment of the present invention, an embodiment of code modulation device includes:
CRC discarding unit, for when packet being encoded and modulating, abandon the crc field that in this packet, VHT-SIG-B field is corresponding, make when receiving terminal is demodulated and decodes, the no matter demodulation of this VHT-SIG-B field or decoding correctness, all proceeds the solution of the data DATA field in packet and is in harmonious proportion decoding.
In several embodiments provided herein, it should be understood that disclosed apparatus and method can realize by another way. Such as, device embodiment described above is merely schematic, such as, the division of described unit, being only a kind of logic function to divide, actual can have other dividing mode when realizing, for instance multiple unit or assembly can in conjunction with or be desirably integrated into another system, or some features can ignore, or do not perform. Another point, shown or discussed coupling each other or direct-coupling or communication connection can be through INDIRECT COUPLING or the communication connection of some interfaces, device or unit, it is possible to be electrical, machinery or other form.
The described unit illustrated as separating component can be or may not be physically separate, and the parts shown as unit can be or may not be physical location, namely may be located at a place, or can also be distributed on multiple NE. Some or all of unit therein can be selected according to the actual needs to realize the purpose of the present embodiment scheme.
It addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it is also possible to be that unit is individually physically present, it is also possible to two or more unit are integrated in a unit. Above-mentioned integrated unit both can adopt the form of hardware to realize, it would however also be possible to employ the form of SFU software functional unit realizes.
If described integrated unit is using the form realization of SFU software functional unit and as independent production marketing or use, it is possible to be stored in a computer read/write memory medium.Based on such understanding, part or all or part of of this technical scheme that prior art is contributed by technical scheme substantially in other words can embody with the form of software product, this computer software product is stored in a storage medium, including some instructions with so that a computer equipment (can be personal computer, server, or the network equipment etc.) perform all or part of step of method described in each embodiment of the present invention. And aforesaid storage medium includes: USB flash disk, portable hard drive, read only memory (ROM, Read-OnlyMemory), the various media that can store program code such as random access memory (RAM, RandomAccessMemory), magnetic disc or CD.
The above; being only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; change can be readily occurred in or replace, all should be encompassed within protection scope of the present invention. Therefore, protection scope of the present invention should described be as the criterion with scope of the claims.
Claims (10)
1. a code modulating method, it is characterised in that including:
In process packet being encoded and modulate, service-domain SERVICEfield field superelevation in described packet handled up in B signaling VHT-SIG-B field and described packet is combined into an encoding block, uses identical modulation system and coded system are encoded and modulate;
Described SERVICEfield field includes: the CRC crc field corresponding with described VHT-SIG-B field.
2. method according to claim 1, it is characterised in that described method also includes:
The coded system that the crc field use that VHT-SIG-B field in described packet and VHT-SIG-B field are corresponding is identical.
3. method according to claim 2, it is characterised in that described method also includes:
When described VHT-SIG-B field and described crc field are encoded, use different code checks, and described crc field is encoded in one and same coding block with the data Data field in described packet and modulates.
4. method according to claim 2, it is characterised in that described method also includes:
Described crc field and described VHT-SIG-B field are combined into an encoding block, are encoded and modulate.
5. the method according to Claims 1-4 any one, it is characterised in that
Described SERVICEfield field also includes: scrambler initialization ScramblerInit field;
Described method also includes: when using CRC that described packet is protected, also use crc field to protect the described ScramblerInit field in described packet.
6. the method according to Claims 1-4 any one, it is characterised in that described code modulation mode includes:
Modulation system: binary phase shift keying BPSK, QPSK QPSK or 16 quadrature amplitude modulation QAM;
Coded system: 1/2 convolutional encoding, 2/3 convolutional encoding or 3/4 convolutional encoding.
7. a code modulation device, it is characterised in that including:
Modulating unit, for in process packet being encoded and modulate, service-domain SERVICEfield field superelevation in described packet handled up in B signaling VHT-SIG-B field and described packet is combined into an encoding block, uses identical modulation system and coded system are encoded and modulate;
Described SERVICEfield field includes: the CRC crc field corresponding with described VHT-SIG-B field.
8. device according to claim 7, it is characterised in that described device also includes:
Coding unit, for using identical coded system that the crc field that the VHT-SIG-B field in the packet needing transmission is corresponding with described VHT-SIG-B field is encoded.
9. device according to claim 7, it is characterised in that described device also includes:
CRC generation unit, for when using CRC that described packet is protected, also using crc field to protect the ScramblerInit field in described packet.
10. device according to claim 8, it is characterised in that described device also includes:
Encoding block allocation units, it is combined into an encoding block for described crc field is closed described VHT-SIG-B field, or the SERVICEfield field in described VHT-SIG-B field and described packet is combined into an encoding block, and after completing encoding block distribution, trigger described coding unit.
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| US10153868B2 (en) * | 2015-06-12 | 2018-12-11 | Apple Inc. | Hybrid automatic repeat request (H-ARQ) for a wireless local area network |
| CN109428672B (en) * | 2017-08-25 | 2021-06-29 | 中国电信股份有限公司 | Information coding and decoding method and device and information processing system |
| CN112019298B (en) * | 2019-05-31 | 2021-11-19 | 华为技术有限公司 | Coding modulation method, demodulation decoding method, device and equipment |
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