CN103001729A - Code modulation method and device - Google Patents
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- CN103001729A CN103001729A CN2011102717725A CN201110271772A CN103001729A CN 103001729 A CN103001729 A CN 103001729A CN 2011102717725 A CN2011102717725 A CN 2011102717725A CN 201110271772 A CN201110271772 A CN 201110271772A CN 103001729 A CN103001729 A CN 103001729A
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Abstract
An embodiment of the invention discloses code modulation method and device. The code modulation method and device are used to avoid misjudgment caused by high CRC (cyclic redundancy check) error rate. The method includes: encoding and modulating data packets, and similarly modulating VHT-SIG-B (very high throughput signal B) fields and CRC fields corresponding to the VHT-SIG-B fields in the data packets. The invention further discloses a device related to the method.
Description
Technical field
The present invention relates to the communications field, especially design a kind of code modulating method and relevant apparatus.
Background technology
Because the existence of interference and noise in the channel circumstance is so that often there is certain error probability in transfer of data.In order to reduce as much as possible this transmission error probability, usually can carry out chnnel coding and add cyclic redundancy check (CRC) code (CRC, Cyclic Redundancy Check) protection operation at transmitter.
Chnnel coding refers to add certain redundant bit in data bit, so that can be by decoded operation so that the raising of the reception correct probability of data at receiving terminal.Receiving terminal recovers the information bit of transmission by decoding.Add redundant what in the code check reflection cataloged procedure, code check=information bit/(information bit+redundant bit number), the lower then error correcting capability of code check is stronger, but expense is larger.
Add the CRC protection and refer to behind information bit, increase some bits, these bits are related according to the rule generation that the sending and receiving end consults with information bit before, again produce CRC according to rule at receiving terminal according to the information bit that receives, compare with the actual CRC that receives, if the two is in full accord, then think this packet separate fully right; Otherwise this packet is thought the reception mistake.
In the packet of prior art WLAN (wireless local area network), take 802.11ac as example, at the superelevation of the packet B signaling (VHT-SIG-B that handles up, Very high throughput signal B) field adopts binary phase shift keying (BPSK, Binary Phase Shift Keying) modulation, 1/2 code check convolutional encoding.Data (Data) field adopts variable coding and modulation system, and modulation system can be from BPSK to 256 quadrature amplitude modulation (QAM, Quadrature Amplitude Modulation), code check from 1/2 to 5/6.In 802.11ac, the CRC that VHT-SIG-B is corresponding has been placed on service (SERVICE) field, with the CRC check position of 8 bits in the SERVICE field as VHT-SIG-B.
When receiving terminal is separated mediation decoding to packet, if the solution of VHT-SIG-B field is in harmonious proportion decoding correctly, when crc field being carried out demodulation or decoding appearance mistake, then the CRC check of VHT-SIG-B field can't be passed through, and because what carry is the necessary code modulation mode of demodulation Data and data length in the VHT-SIG-B field, therefore, in case think that the CRC check of VHT-SIG-B field can't pass through, go the Data field of demodulation back also can make mistakes with the wrong information such as code modulation mode so, so as long as the CRC check of VHT-SIG-B is failed, just stop the receiving course of whole packet.
But because prior art is VHT-SIG-B field and its corresponding crc field are encoded respectively and to modulate, the VHT-SIG-B field adopts BPSK modulation, 1/2 code check convolutional encoding.And crc field and Data field adopt the same-code modulation system, and the coded modulation exponent number of Data field (coded modulation exponent number and code modulated accuracy are inversely proportional to) will be higher than VHT-SIG-B usually, even the demodulation coding of the CRC check of VHT-SIG-B therefore may occur makes mistakes, and the Data field of back is correct situation, in this case, abandoning all data in back is very large wastes.
Summary of the invention
The embodiment of the invention provides a kind of code modulating method and relevant apparatus, for the erroneous judgement problem of avoiding causing owing to the crc error rate is higher.
Code modulating method provided by the invention, comprise: in the process of packet being encoded and modulating, the handle up cyclic redundancy check (CRC) code crc field of B signaling VHT-SIG-B field and described VHT-SIG-B Related fields of the superelevation in the described packet is used identical modulation system.
Demodulation coding method provided by the invention comprises: the receive data bag; When described packet being separated mediation decoding, ignore in the described packet function with the crc field of VHT-SIG-B Related fields, so that the no matter demodulation of described crc field or decoding correctness, the solution of all proceeding the data DATA field in the described packet is in harmonious proportion decoding.
Code modulating method provided by the invention, comprise: when packet being encoded and modulate, abandon the crc field of VHT-SIG-B Related fields in the described packet, so that when receiving terminal is separated mediation decoding, the no matter demodulation of described VHT-SIG-B field or decoding correctness, the solution of all proceeding the data DATA field in the described packet are in harmonious proportion decoding.
Coded modulation device provided by the invention, comprise: modulating unit, be used in the process that packet is encoded and modulated, use identical modulation system that the VHT-SIG-B field in the packet of needs transmission and the crc field of described VHT-SIG-B Related fields are modulated.
Demodulation coding device provided by the invention comprises: receiving element is used for the receive data bag; The demodulation coding unit, be used for described packet is separated mediation decoding, and ignore in the described packet function with the crc field of VHT-SIG-B Related fields, so that the no matter demodulation of described crc field or decoding correctness, the solution of all proceeding the data DATA field in the described packet is in harmonious proportion decoding.
Coded modulation device provided by the invention, comprise: the CRC discarding unit, be used for when packet being encoded and modulate, abandon the crc field of VHT-SIG-B Related fields in the described packet, so that when receiving terminal is separated mediation decoding, the no matter demodulation of described VHT-SIG-B field or decoding correctness, the solution of all proceeding the data DATA field in the described packet are in harmonious proportion decoding.
As can be seen from the above technical solutions, the embodiment of the invention has the following advantages: the present invention has avoided the erroneous judgement problem that causes owing to the crc error rate is higher, thereby has reduced the expense that packet is processed.
Description of drawings
Fig. 1 is a schematic flow sheet of code modulating method in the embodiment of the invention;
Fig. 2 is a data structural representation of packet in the embodiment of the invention;
Fig. 3 is another schematic flow sheet of code modulating method in the embodiment of the invention;
Fig. 4 is another schematic flow sheet of code modulating method in the embodiment of the invention;
Fig. 5 is another data structure schematic diagram of packet in the embodiment of the invention;
Fig. 6 is another data structure schematic diagram of packet in the embodiment of the invention;
Fig. 7 is another schematic flow sheet of code modulating method in the embodiment of the invention;
Fig. 8 is a structural representation of coded modulation device in the embodiment of the invention;
Fig. 9 is another structural representation of demodulation coding device in the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of code modulating method and relevant apparatus, for the erroneous judgement problem of avoiding causing owing to the crc error rate is higher.
Code modulating method embodiment comprises in the embodiment of the invention:
In the process of packet being encoded and modulating, the handle up cyclic redundancy check (CRC) code crc field of B signaling VHT-SIG-B field and this VHT-SIG-B Related fields of the superelevation in this packet is used identical modulation system.
See also Fig. 1, another embodiment of code modulating method comprises in the embodiment of the invention:
101, the coded modulation device carries out the group bag of packet;
In WLAN (wireless local area network), the coded modulation device packages to the packet that will send, include in this packet: the training sequence field, control message field and physical layer services data are in conjunction with (PSDU, Physical layer Service Data Unit) field.
This training sequence field is synchronous and channel estimating for the signal of this packet;
In actual applications, the coded modulation device can be a website of WLAN.
The concrete data content that this PSDU field comprises for this packet includes SERVICE field field and Data field; This Data field can be by a plurality of media access control protocol data unit (MPDU, Mac Protocol Data Unit) is polymerized, wherein, each MPDU can regard a relatively independent data subelement as, when error of transmission occurs 1 MPDU, can only retransmit this MPDU, and needn't retransmit all MPDU.
This control message field is used for the control message of this packet of mark, and wherein, this control message field includes the VHT-SIG-B field, and this VHT-SIG-B field kind is marked with the information such as the necessary code modulation mode of demodulation back data division and data length.
In the process of group bag, the coded modulation device need to add the CRC protection to above-mentioned VHT-SIG-B field and Data field, and the CRC check code of VHT-SIG-B Related fields can be put into the crc field of above-mentioned SERVICE field field; Concrete data structure can be with reference to figure 2.
102, the coded modulation device is encoded to the VHT-SIG-B field in the packet and is modulated;
The coded modulation device is encoded to the VHT-SIG-B field in the above-mentioned packet and is modulated, and wherein, the VHT-SIG-B field is encoded as independent encoding block and modulated; The mode of modulation can be BPSK, Quadrature Phase Shift Keying (QPSK, Quadrature Phase Shift Keying) or 16QAM; The mode of coding can be 1/2 convolutional encoding, 2/3 convolutional encoding or 3/4 convolutional encoding.
103, the coded modulation device uses the modulation system identical with the VHT-SIG-B field that the crc field in the packet is modulated.
The coded modulation device is encoded to the crc field among the above-mentioned SERVICE field and is modulated, and wherein, when this crc field was modulated, the modulation system that the coded modulation device uses was identical with the modulation system of above-mentioned VHT-SIG-B field.
Optionally, for fear of the physical layer architecture of available data bag is made too many change, the embodiment of the invention is when encoding to crc field and modulating, although use the identical modulation system with above-mentioned VHT-SIG-B field, but, can be the same with existing 802.11ac, Data field in crc field and the packet is placed on encodes in the one and same coding piece and modulate, this crc field uses identical code check to encode with the Data field, and namely VHT-SIG-B field and its corresponding crc field are independently encoded respectively and modulated.
Because the embodiment of the invention is used identical modulation system to the VHT-SIG-B field in the packet of WLAN (wireless local area network) with the crc field of VHT-SIG-B Related fields, therefore, the recipient is when carrying out demodulation coding to VHT-SIG-B field and this crc field, accuracy is close, so that when the demodulation coding of the CRC check of VHT-SIG-B is made mistakes, the probability that the demodulation coding of the Data field of back is also made mistakes increases, and has improved the practicality of crc field.
In order further to improve the similarity of VHT-SIG-B field and its corresponding crc field success rate when the demodulation coding, the invention provides corresponding technical scheme, specifically see also Fig. 3, another embodiment of code modulating method comprises in the embodiment of the invention:
301, the coded modulation device carries out the group bag of packet;
In WLAN (wireless local area network), the coded modulation device is packaging to the packet that will send, and includes in this packet: training sequence field, control message field and PSDU field.
SERVICE field field includes the crc field of reservation (Reserved) field, scrambler initialization (Scrambler Init) field and VHT-SIG-B Related fields in embodiments of the present invention.
This Scrambler Init field is used for the initial condition position of mark scrambler, so that receiving terminal can use this initial condition position to carry out descrambling in follow-up descrambling process.
Optionally; in the process that this packet is packaged; in order to guarantee that further receiving terminal carries out the accuracy of demodulation coding to this packet, the coded modulation device of transmitting terminal can also use above-mentioned crc field that this Scrambler Init field is added the CRC protection.
302, the coded modulation device is encoded to the VHT-SIG-B field in the packet and is modulated;
The content of the step 302 in the present embodiment is identical with the content of step 102 among the aforementioned embodiment shown in Figure 1, repeats no more herein.
303, the coded modulation device uses the coding identical with the VHT-SIG-B field and modulation system the crc field in the packet is encoded and to modulate.
The coded modulation device is encoded to the crc field among the above-mentioned SERVICE field and is modulated, wherein, when carrying out this crc field coding and modulation, the coding that the coded modulation device uses is identical with modulation system with the coding of modulation system and above-mentioned VHT-SIG-B field.
In embodiments of the present invention, the VHT-SIG-B field is not only used identical modulation system with its corresponding crc field, and use identical coded system, so that the code modulated process of two parts is more approaching, thereby further improved the similarity of VHT-SIG-B field and its corresponding crc field success rate when demodulation coding.
The present invention can also so that VHT-SIG-B field and its corresponding crc field in same encoding block, encode, so that VHT-SIG-B field and its corresponding crc field success rate when demodulation coding is consistent, specifically see also Fig. 4, another embodiment of code modulating method comprises in the embodiment of the invention:
401, the coded modulation device carries out the group bag of packet;
In WLAN (wireless local area network), the coded modulation device is packaging to the packet that will send, and includes in this packet: training sequence field, control message field and PSDU field.
In the process that this packet is packaged, for the ease of the coded modulation device with the VHT-SIG-B field with and corresponding crc field put into the one and same coding district and encode and modulate, the coded modulation device can be put into the VHT-SIG-B field with the crc field of VHT-SIG-B Related fields, and concrete data structure can be with reference to figure 5;
Optionally, can also be further original VHT-SIG-B and the two-part field of SERVICE field being merged into a field operates, be about to original SERVICE field field also as the part of control message, concrete data structure can be with reference to figure 6.In the data structure of Fig. 5 and Fig. 6, Tail is the tail bit field, as the latter end of a field.
402, the coded modulation device is encoded to VHT-SIG-B field and its corresponding crc field simultaneously and is modulated.
The coded modulation device with the crc field of VHT-SIG-B Related fields with and the data protected (in the group packet procedures; if the coded modulation device is not included Scrambler Init field in this crc field protection; then " data that it is protected " only are the VHT-SIG-B field; if have, then " data that it is protected " are VHT-SIG-B field and Scrambler Init field).
Concrete, the data that the coded modulation device is protected crc field, crc field and Tail field are placed on encodes in the encoding block and modulates, and the data in this encoding block are all used identical modulation system and coded system.Modulation system can comprise BPSK, QPSK or 16QAM; Coded system can comprise 1/2 convolutional encoding, 2/3 convolutional encoding or 3/4 convolutional encoding.CRC adopts the N bit, and the N value can be 4,8 or 16.The length of VHT-SIG-B may be M orthogonal frequency division multiplexi (OFDM, Orthogonal frequency-division multiplexing) symbol, and M can be 1 or 2.
Optionally, if the process of above-mentioned group of bag is merged into a field with original VHT-SIG-B and the two-part field of SERVICE field and is operated, then the coded modulation device can be with the putting into an encoding block in conjunction with field and encode and modulate of the VHT-SIG-B after merging and SERVICE field (comprising the crc field that Reserved field, Scrambler Init field and VHT-SIG-B Related fields are arranged), and the data in this encoding block are all used identical modulation system and coded system.
The above processes VHT-SIG-B field and its corresponding crc field inconsistent problem of success rate when the demodulation coding from the angle of transmitting terminal, the below proposes corresponding scheme from the angle of receiving terminal, see also Fig. 7, another embodiment of code modulating method comprises in the embodiment of the invention:
Be received in the packet that transmits in the WLAN (wireless local area network); When this packet being separated mediation decoding, ignore in this packet the function with the crc field of VHT-SIG-B Related fields, so that the no matter demodulation of this crc field or decoding correctness, the solution of all proceeding the data DATA field in this packet is in harmonious proportion decoding.
701, the demodulation coding device is received in the packet that transmits in the WLAN (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, control message field and PSDU field.
In actual applications, the demodulation coding device can be a website of WLAN.
This control message field is used for the control message of this packet of mark, and wherein, this control message field includes the VHT-SIG-B field, and this VHT-SIG-B field kind is marked with the information such as the necessary code modulation mode of demodulation back data division and data length; Wherein, the VHT-SIG-B field adds the crc field of CRC protection in the SERVICE of PSDU field field field.
702, the demodulation coding device is separated to be in harmonious proportion to the VHT-SIG-B field in the packet and is deciphered;
The demodulation coding device is separated to be in harmonious proportion to the VHT-SIG-B field in the packet and is deciphered, after decoding is finished, the demodulation coding device receives the data symbol part in this packet, and judge by the decoding correctness of confirming the VHT-SIG-B field whether the packet that receives is effective, if invalid, then this packet takes defeat; Separate mediation decoding if effectively, then continue to trigger step 703 pair SERVICE field field.
703, the demodulation coding device is separated to be in harmonious proportion to the SERVICE field field in the packet and is deciphered;
The demodulation coding device is separated to be in harmonious proportion to the SERVICE field field in the packet and is deciphered, in separating mediation decoding ground process, ignore in this packet the function with the crc field of VHT-SIG-B Related fields, so that the no matter demodulation of this crc field or decoding correctness, the solution that all continues to trigger the Data field in step 704 pair this packet is in harmonious proportion to be deciphered.
704, the demodulation coding device is separated to be in harmonious proportion to the Data field in the packet and is deciphered.
The demodulation coding device is separated to be in harmonious proportion to the Data field in the packet and is deciphered, after the solution mediation decoding of Data field ground is finished, data after the demodulation coding device is deciphered out to this Data field by the CRC check code of Data Related fields are again proofreaded, confirm errorless after, the reception of this packet success.
In embodiments of the present invention, for fear of the situation because of VHT-SIG-B field and its corresponding crc field inconsistent packet discard that leads to errors of success rate when the demodulation coding, when SERVICE field field being separated mediation decoding, directly ignore the wherein effect of the CRC word of VHT-SIG-B Related fields, so that the no matter demodulation of this crc field or decoding correctness, all continue solution to the Data field in this packet and be in harmonious proportion decoding.In embodiments of the present invention, sacrificed at the measuring ability of SERVICE field field being separated when being in harmonious proportion decoding follow-up Data field, with check Data field whether the correct task CRC check code of entirely giving the Data Related fields finish.
Wherein, optionally, when 703 couples of SERVICE field of above-mentioned steps field is separated mediation decoding, if the demodulation of crc field or decoding failure, then trigger the coded modulation (MCS that judges that SERVICE field field adopts in the packet, Modulation and Coding Scheme) whether exponent number is greater than the step of N, if this coded modulation exponent number is greater than N, just trigger the step ignore in the packet with the function of the crc field of VHT-SIG-B Related fields, N is the arbitrary integer between 0 to 8; If this coded modulation exponent number is less than or equal to N, then as existing 802.11ac, confirm the CRC check failure of the VHT-SIG-B field of front, stop the process that packet receives.
The MCS exponent number has 10 kinds, and the MCS exponent number is higher, and then under identical SNR (signal to noise ratio, Signal-noise ratio), (Eb/No) is lower for the bit signal to noise ratio.
Take SNR=0dB (dB: decibel) as example:
For MCS=0, this moment, corresponding coded modulation was 1/2, BPSK, and 1 (BPSK) * 1/2 (R)=1/2 information bit, so Eb/No=0-10*log arranged in 1 symbol
10(1/2)=3dB.
For MCS=1, this moment, corresponding coded modulation was 1/2, QPSK, and 2 (QPSK) * 1/2 (R)=1 information bit, so Eb/No=0-10*log are arranged in 1 symbol
10(1)=0dB.
For MCS=6, this moment, corresponding coded modulation was 1/2, QPSK, and 6 (64QAM) * 3/4 (R)=4.5 information bit, so Eb/No=0-10*log are arranged in 1 symbol
10(4.5)=-6.5dB.
Can see, because Eb/No=SNR-10*log
10(N), the information bit of N for comprising in each modulation symbol, because the MCS exponent number is higher, then the N value is larger, and the bit signal to noise ratio is lower, and this moment, the accuracy of transmission was also lower.
Adjustable according to actual conditions, the exponent number N of MCS can be set to 0 to 8 (9 kinds) any one value among the present invention.
Another embodiment of code modulating method comprises in the embodiment of the invention:
When the packet of WLAN (wireless local area network) being encoded and modulates, abandon the crc field of VHT-SIG-B Related fields in the described packet, so that when receiving terminal is separated mediation decoding, the no matter demodulation of VHT-SIG-B field or decoding correctness, the solution of all proceeding the data Data field in this packet are in harmonious proportion decoding.
The below describes the embodiment for the coded modulation device of the present invention of carrying out above-mentioned code modulating method, and its logical construction please refer to Fig. 8, and the coded modulation device embodiment comprises in the embodiment of the invention:
Website in the embodiment of the invention can further include:
Encoding block allocation units 804, be used for that described crc field is closed described VHT-SIG-B field and be combined into an encoding block, or the SERVICE field field in described VHT-SIG-B field and the described packet is combined into an encoding block, and after finishing the encoding block distribution, trigger described coding unit 802.
The concrete reciprocal process of unit is as follows in the embodiment of the invention coded modulation device:
In WLAN (wireless local area network), the coded modulation device packages to the packet that will send, and includes in this packet: training sequence field, control message field and PSDU field.
This training sequence field is synchronous and channel estimating for the signal of this packet;
The concrete data content that this PSDU field comprises for this packet includes SERVICE field field and Data field; This Data field can be by a plurality of media access control protocol data unit (MPDU, Mac Protocol Data Unit) is polymerized, wherein, each MPDU can regard a relatively independent data subelement as, when error of transmission occurs 1 MPDU, can only retransmit this MPDU, and needn't retransmit all MPDU.
This control message field is used for the control message of this packet of mark, and wherein, this control message field includes the VHT-SIG-B field, and this VHT-SIG-B field kind is marked with the information such as the necessary code modulation mode of demodulation back data division and data length.
In the process of group bag, the coded modulation device need to add the CRC protection to above-mentioned VHT-SIG-B field and Data field, and the CRC check code of VHT-SIG-B Related fields can be put into the crc field of above-mentioned SERVICE field field; Concrete data structure can be with reference to figure 2.
Optionally, in the process that adds the CRC protection, CRC generation unit 803 uses crc field that the Scrambler Init field in this packet and VHT-SIG-B field are protected.
After finishing the group bag of packet, different fields is carried out the distribution of encoding block in 804 pairs of these packets of encoding block allocation units.Optionally, encoding block allocation units 804 can be combined into an encoding block in conjunction with this VHT-SIG-B field with crc field, or the SERVICE field field in VHT-SIG-B field and the described packet is combined into an encoding block, and after finishing the encoding block distribution, trigger described coding unit 802 and use identical coded system that the VHT-SIG-B field in the packet of needs transmission and the crc field of described VHT-SIG-B Related fields are encoded.After finishing coding, modulating unit 801 uses identical modulation system that the VHT-SIG-B field in the packet of needs transmission and the crc field of VHT-SIG-B Related fields are modulated.
The below describes the embodiment for the demodulation coding device of the present invention of carrying out above-mentioned demodulation coding method, and its logical construction please refer to Fig. 9, and the demodulation coding device embodiment comprises in the embodiment of the invention:
Receiving element 901 is used for being received in the packet that WLAN (wireless local area network) is transmitted;
Demodulation coding device in the embodiment of the invention can further include:
Judging unit 903, be used for before the function of packet and the crc field of VHT-SIG-B Related fields is ignored in the demodulation coding unit, judge that whether SERVICE field field adopts in the described packet coded modulation exponent number is greater than N, if, then trigger the described step of ignoring in the packet with the function of the crc field of VHT-SIG-B Related fields in demodulation coding unit, described N is the arbitrary integer between 0 to 8; If not, then stop the solution mediation of described packet is deciphered.
The concrete reciprocal process of unit is as follows in the embodiment of the invention demodulation coding device:
The packet that the demodulation coding device of receiving element 901 receiving end/sending ends of demodulation coding device sends includes in this packet: training sequence field, control message field and PSDU field.This control message field is used for the control message of this packet of mark, and wherein, this control message field includes the VHT-SIG-B field, and this VHT-SIG-B field kind is marked with the information such as the necessary code modulation mode of demodulation back data division and data length; Wherein, the VHT-SIG-B field adds the crc field of CRC protection in the SERVICE of PSDU field field field.
After receiving above-mentioned packet, VHT-SIG-B field in the 902 pairs of packets in demodulation coding unit is separated to be in harmonious proportion and is deciphered, after decoding is finished, the demodulation coding device receives the data symbol part in this packet, and judge by the decoding correctness of confirming the VHT-SIG-B field whether the packet that receives is effective, if invalid, then this packet takes defeat; If effectively, then continue SERVICE field field is separated mediation decoding.In to SERVICE field field solution mediation decoding ground process, ignore in this packet the function with the crc field of VHT-SIG-B Related fields, so that the no matter demodulation of this crc field or decoding correctness, all continue solution to the Data field in this packet and be in harmonious proportion decoding.
Wherein, optionally, above-mentioned SERVICE field field is separated when being in harmonious proportion decoding, if the demodulation of crc field or decoding failure, then trigger MCS exponent number that judging unit 903 judges that SERVICE field field adopts in the packet whether greater than the step of N, if this coded modulation exponent number is greater than N, just trigger the step of ignoring in the packet with the function of the crc field of VHT-SIG-B Related fields, N is the arbitrary integer between 0 to 8; If this coded modulation exponent number is less than or equal to N, then as existing 802.11ac, confirm the CRC check failure of the VHT-SIG-B field of front, stop the process that packet receives.
The below describes the embodiment for the coded modulation device of the present invention of carrying out above-mentioned demodulation coding method, and the coded modulation device embodiment comprises in the embodiment of the invention:
The CRC discarding unit, be used for when packet being encoded and modulate, abandon the crc field of VHT-SIG-B Related fields in this packet, so that when receiving terminal is separated mediation decoding, the no matter demodulation of this VHT-SIG-B field or decoding correctness, the solution of all proceeding the data DATA field in the packet are in harmonious proportion decoding.
In several embodiment that the application provides, should be understood that, disclosed apparatus and method can realize by another way.For example, device embodiment described above only is schematic, for example, the division of described unit, only be that a kind of logic function is divided, during actual the realization other dividing mode can be arranged, for example a plurality of unit or assembly can in conjunction with or can be integrated into another system, or some features can ignore, or do not carry out.Another point, the shown or coupling each other discussed or direct-coupling or communication connection can be by some interfaces, indirect coupling or the communication connection of device or unit can be electrically, machinery or other form.
Described unit as separating component explanation can or can not be physically to separate also, and the parts that show as the unit can be or can not be physical locations also, namely can be positioned at a place, perhaps also can be distributed on a plurality of network element.Can select according to the actual needs wherein some or all of unit to realize the purpose of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in the processing unit, also can be that the independent physics of unit exists, and also can be integrated in the unit two or more unit.Above-mentioned integrated unit both can adopt the form of hardware to realize, also can adopt the form of SFU software functional unit to realize.
If described integrated unit is realized with the form of SFU software functional unit and during as independently production marketing or use, can be stored in the computer read/write memory medium.Based on such understanding, part or all or part of of this technical scheme that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprise that some instructions are with so that a computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out all or part of step of the described method of each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only memory (ROM, Read-Only Memory), the various media that can be program code stored such as random access memory (RAM, Random Access Memory), magnetic disc or CD.
The above; be the specific embodiment of the present invention only, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by described protection range with claim.
Claims (17)
1. a code modulating method is characterized in that, comprising:
In the process of packet being encoded and modulating, the handle up cyclic redundancy check (CRC) code crc field of B signaling VHT-SIG-B field and described VHT-SIG-B Related fields of the superelevation in the described packet is used identical modulation system.
2. method according to claim 1 is characterized in that, described method also comprises:
VHT-SIG-B field in the described packet is used identical coded system with the crc field of VHT-SIG-B Related fields.
3. method according to claim 2 is characterized in that, described method also comprises:
When described VHT-SIG-B field and described crc field are encoded, use different code checks, and the data Data field in described crc field and the described packet is encoded in the one and same coding piece and is modulated.
4. method according to claim 2 is characterized in that, described method also comprises:
Described crc field and described VHT-SIG-B field are combined into an encoding block, encode and modulate.
5. method according to claim 1 is characterized in that, described cyclic redundancy check (CRC) code crc field corresponding to the VHT-SIG-B field in the packet and VHT-SIG-B is used identical modulation system, comprising:
Service-domain SERVICE field field in described VHT-SIG-B field and the described packet is combined into an encoding block, uses identical modulation system and coded system to encode and modulate;
Described SERVICE field field comprises: described crc field.
6. according to claim 1 to the described method of 5 any one, it is characterized in that,
Described SERVICE field field comprises: scrambler initialization Scrambler Init field;
Described method also comprises: when using CRC that described packet is protected, the described Scrambler Init field in the described packet is also used crc field protection.
7. according to claim 1 to the described method of 5 any one, it is characterized in that, described code modulation mode comprises:
Modulation system: binary phase shift keying BPSK, Quadrature Phase Shift Keying QPSK or 16 quadrature amplitude modulation QAM;
Coded system: 1/2 convolutional encoding, 2/3 convolutional encoding or 3/4 convolutional encoding.
8. a demodulation coding method is characterized in that, comprising:
The receive data bag;
When described packet being separated mediation decoding, ignore in the described packet function with the crc field of VHT-SIG-B Related fields, so that the no matter demodulation of described crc field or decoding correctness, the solution of all proceeding the data DATA field in the described packet is in harmonious proportion decoding.
9. method according to claim 8 is characterized in that, before the described function of ignoring in the packet with the crc field of VHT-SIG-B Related fields, comprising:
Whether judge SERVICE field field adopts in the described packet coded modulation exponent number greater than N, if, then triggering the described step of ignoring in the packet with the function of the crc field of VHT-SIG-B Related fields, described N is the arbitrary integer between 0 to 8; If not, then stop the solution mediation of described packet is deciphered.
10. a code modulating method is characterized in that, comprising:
When packet being encoded and modulates, abandon the crc field of VHT-SIG-B Related fields in the described packet, so that when receiving terminal is separated mediation decoding, the no matter demodulation of described VHT-SIG-B field or decoding correctness, the solution of all proceeding the data DATA field in the described packet are in harmonious proportion decoding.
11. a coded modulation device is characterized in that, comprising:
Modulating unit is used in the process that packet is encoded and modulated, and uses identical modulation system that the VHT-SIG-B field in the packet of needs transmission and the crc field of described VHT-SIG-B Related fields are modulated.
12. device according to claim 11 is characterized in that, described website also comprises:
Coding unit is used for using identical coded system that the VHT-SIG-B field of the packet of needs transmission and the crc field of described VHT-SIG-B Related fields are encoded.
13. device according to claim 11 is characterized in that, described website also comprises:
The CRC generation unit is used for when using CRC that described packet is protected the Scrambler Init field in the described packet also being used crc field protection.
14. device according to claim 12 is characterized in that, described website also comprises:
The encoding block allocation units, be used for that described crc field is closed described VHT-SIG-B field and be combined into an encoding block, or the SERVICE field field in described VHT-SIG-B field and the described packet is combined into an encoding block, and after finishing encoding block and distributing, trigger described coding unit.
15. a demodulation coding device is characterized in that, comprising:
Receiving element is used for the receive data bag;
The demodulation coding unit, be used for described packet is separated mediation decoding, and ignore in the described packet function with the crc field of VHT-SIG-B Related fields, so that the no matter demodulation of described crc field or decoding correctness, the solution of all proceeding the data DATA field in the described packet is in harmonious proportion decoding.
16. device according to claim 15 is characterized in that, described website also comprises:
Judging unit, be used for before the function of packet and the crc field of VHT-SIG-B Related fields is ignored in the demodulation coding unit, judge that whether SERVICE field field adopts in the described packet coded modulation exponent number is greater than N, if, then trigger the described step of ignoring in the packet with the function of the crc field of VHT-SIG-B Related fields in demodulation coding unit, described N is the arbitrary integer between 0 to 8; If not, then stop the solution mediation of described packet is deciphered.
17. a coded modulation device is characterized in that, comprising:
The CRC discarding unit, be used for when packet being encoded and modulate, abandon the crc field of VHT-SIG-B Related fields in the described packet, so that when receiving terminal is separated mediation decoding, the no matter demodulation of described VHT-SIG-B field or decoding correctness, the solution of all proceeding the data DATA field in the described packet are in harmonious proportion decoding.
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