34results about How to "Reduce decoding overhead" patented technology

The present invention relates to a method and apparatus for transmitting and receiving data in a multi-carrier communications system. The data transmission / receiving method uses multiple carriers including a primary carrier that is capable of transmitting and receiving data traffic and PHY / MAC control information between a terminal and a base station and at least one secondary carrier that transmits and receives down-link data traffic between the terminal and the base station. The method comprises: generating an MPDU (MAC Protocol Data Unit) to be sent to a PHY (Physical) layer in an MAC (Medium Access Control) layer; performing channel-coding and modulation on the MPDU to generate a modulated symbol sequence in the PHY layer; segmenting the modulated symbol sequence into multiple symbol sequences; and allocating the multiple segmented symbol sequences to multiple carriers, respectively, to perform IFFT (Inverse Fast Fourier Transform) and transmit to a terminal, wherein control information on the multiple carriers is allocated to a control channel region of the primary carrier and transmitted via the primary carrier.

The invention provides a construction method of degree distribution of LT codes. The method first adjusts a binary system degree distribution, then organically combines the binary system degree distribution with robust soliton distribution, and further optimizes a degree distribution function through optimization of a translatable set value, thereby obtaining degree distribution which also has relatively good performance when code length of source data is short, i.e., binary system-robust soliton distribution is corrected. The corrected binary system-robust soliton distribution is utilizes to perform LT fountain coding on the source data, decoding spending can be reduced, decoding efficiency can be improved, and fountain codes can be well applied to the communication fields.

The invention discloses a method and a system for encoding and decoding a panoramic video. The method comprises the following steps of sending, by a panoramic camera, the panoramic video to an image data caching unit after the panoramic video is shot and obtained; dividing, by the image data caching unit, the panoramic video into multiple viewpoint video sequences through an encoder according to aviewpoint division rule; encoding each viewpoint video sequence, to obtain multiple groups of encoded data; decoding, by a user device, the encoded data through a decoder, and playing the viewpoint video sequences obtained by decoding. The system comprises the panoramic camera, a communication unit and the user device. The method not only can be used for accurately judging the movement trend of auser, but also can be used for guaranteeing to decode, in real time, the panoramic video corresponding to an FOV (Field of View) in an effective viewpoint range in front of a viewpoint according to apretreatment unit, and the decoding expense is decreased.

The invention provides an LT code degree distribution design method and device. A bit error rate and the decoding cost can be reduced. The decoding efficiency is improved. The method comprises the steps of determining a packet number of a to-be-coded source data packet based on a distribution function for PMRSD degree distribution; generating a coding generation matrix G <KxN > according to the total number K of source data packets, the total number N of coding data packets and the packet number of the to-be-coded source data packet; carrying out module 2 multiplication on the source data packets and the G <KxN >, thereby obtaining the coding data packets, and sending the coding data packets to a receiving end; generating the coding generation matrix G <KxN > at the receiving end, judging whether a list of which degree value d=1 exists in the generated G <KxN > or not, if the list exists, assuming that the source data packet s corresponding to a point (i, j) of the degree value d=1 in the G <KxN > is equal to the received coding data packet c<j >, and adding up a decoding counter count and 1; and assuming that a value of the coding data packet c<j > related to the s is equal to the exclusive or of the value of the original coding data packet c<j > and the s, setting a value of an element related to the s in the G <KxN > as 0, and finishing decoding when the count is equal to K. The method and the device relate to the technical field of communication.

The invention relates to a high-coding symbol value broadcasting method based on system online fountain codes, and belongs to the technical field of channel coding, fountain codes and wireless broadcasting. The method comprises the following steps: 1) performing initialization; 2) generating and sending a first type of coding symbols; 3) receiving and processing the first type of coding symbols; 4) repeating the steps 2) and 3) until the sending number of the first type of coding symbols reaches a set parameter; 5) enabling a decoder to count the recovery proportion and generate feedback; 6) generating and sending a second type of coding symbols; 7) receiving and processing the second type of coding symbols; 8) processing the coded symbol with the degree value of 1; 9) processing the codedsymbol with the degree value of 2; 10), repeating steps 5) -9) till decoders at all receiving ends finish coding. under the condition that broadcast channel receiving ends are heterogeneous and are not provided with the decoders, the number of feedback retransmission times during fountain code decoding is effectively reduced, the decoding expenditure of users with good channel states and poor channel states is reduced, and the system throughput is improved.

The invention relates to an online fountain code limited feedback method, and belongs to the technical field of channel coding. The method the following steps: 1) determining all possible feedback degree values; (2) establishing an overhead table through points; 3) calculating a feedback point corresponding to the feedback time value; 4) randomly selecting a group of overhead as a threshold; 5) randomly selecting an overhead value in the corresponding column of the degree value, updating the serial number of the degree value, judging whether the serial number is smaller than a threshold, if so, discarding, and if not, recording the current overhead; (6) judging whether the number of the selected degree values reaches the feedback frequency, if not and selectable value existing, skipping to the step (5), if not and selectable value not existing, discarding the sequence, if yes and the total overhead being smaller than the threshold, updating the threshold and recording the sequence, and if yes and the total overhead being larger than the threshold, discarding the sequence; and 7) if iteration reaches a frequency requirement, outputting a degree value sequence, and if not, adding 1 to the number of iterations, and skipping to the step 4). The method can improve the adaptability and reduce the decoding overhead, and the decoding overhead is slowly increased along with the increase of the information length.

The invention discloses a double-connection fountain code transmission method based on partial data overlapping, and the method comprises the following steps: adding overlapping partial data groups indata groups distributed to two base stations by a core network, and enabling the number of the overlapping partial data groups to account for 10-30% of the total number of all data groups in the basestations; wherein in a base station, the overlapped part data groups have the same selected probability Pover; wherein each non-coincident part data packet has the same selected probability Pnon; obtaining a one-step transfer matrix P when the fountain coding degree is d; calculating in the base station according to the one-step transfer matrix P; wherein the probability Pover is selected for each overlapped part data packet, and the probability Pnon is selected for each non-overlapped part data packet; and then data transmission is carried out according to the probability Pover selected by the data packets of the overlapped parts and the probability Pnon selected by the data packets of the non-overlapped parts, so that the data transmission pressure of the shunt node is reduced, and meanwhile, the fountain code decoding overhead of the receiving end and the redundancy of the system are reduced.

The invention discloses a BATS code encoding method based on regular variable node degree distribution. The BATS code encoding method comprises the following steps: 1) a source node randomly selects adegree value d according to a check node degree distribution function omega; 2) the source node selects d input data packets with minimum variable node degree values to perform fountain coding, generates coded blocks with the same size, sets a block identifier for coded data in each coded block, and broadcasts the coded blocks to the relay node; 3) after receiving the coding block, the relay nodeperforms random linear network coding on the coding group in the block, and broadcasts the recoded coding block to the destination node; and 4) the destination node decodes the coded data packet fromthe relay node and recovers the input data. According to the method, all the input groups have the same variable node degree value by regularizing the variable node degree value. It is guaranteed that each input group can participate in the encoding process. The error leveling performance of a traditional BATS code is improved, and the decoding expenditure is reduced.

The invention discloses a degree distribution function design method of network layer fountain code and channel joint encoding. The method comprises the following steps: importing a channel deletion probability and an error correction probability of MP joint decoding into an EISD degree distribution function, and determining the degree distribution function of a signal source to send an encoding packet by an expression of a channel deletion and error correction probability influence function and the expression of a Per-Pc-EISD degree distribution function; importing a strong robust factor, and determining an expanded Per-Pc-EISD degree distribution function based on the channel deletion probability and the error correction probability; performing transfer and normalization processing on the Per-Pc-EISD degree distribution function, and determining the degree distribution function of joint encoding of network layer fountain code encoding and physical layer channel encoding. According to the degree distribution function design method disclosed by the invention, when the Per-Pc-EISD degree distribution function is designed, the probability of restoring a plurality of wrong data packets during the encoding and the channel deletion probability are imported into the degree distribution function, with respect to the joint encoding method of adopting fountain code encoding on a network layer and adopting channel encoding on a physical layer, the decoding cost is effectively reduced, and the reliability and speed of wireless transmission are improved.

The application provides a data sending method, receiving method and device. The method comprises the following step: sending equipment divides a to-be-sent transmission block into at least two codingblocks, a bit of odd-even check bit is added in at least one coding block in at least two coding blocks, the LDPC coding is performed on each coding block after adding the odd-even check bit to obtain a data bit sequence after LDPC coding, and the data bit sequence is sent to receiving equipment; the receiving equipment receives multiple data bit sequences, decodes the same and extracts odd-evencheck bit from the coding block added with the odd-even check bit, the coding block is checked according to the odd-even check bit, and a bit of odd-even check bit is only added on the coding block, thereby effectively reducing the decoding expenditure at a receiving end and saving the decoding and transmission resource.

The invention relates to a fountain-code encoding method with feedback and the unequal error protection capacity. Under some application scenarios, parts of data sets need to be encoded preferentially. The fountain-code encoding method includes the steps of firstly, sequentially processing all input symbols through Bernoulli random experiments; secondly, starting to encode the input symbols through an encoder with an encoding method of standard LT codes; thirdly, when the serial number of a codeword received by a decoder is larger than or equal to the number of the input symbols, feeding the number of most important bits recovered through the decoder and the number of least important bits recovered through the decoder back to the encoder; fourthly, designing a most important increasing-degree generator according to the feedback information to replace a standard-degree generator to encode the most important bits, and designing a least important increasing-degree generator according to the feedback information to replace a standard-degree generator to encode the least important bits. According to the fountain-code encoding method, an encoding structure of the standard LT codes is improved, different encoding methods are adopted for the bits with different important degrees, and the important bits are preferentially recovered.

The invention discloses a method of optimizing a parameter of a digital fountain code in 4G and 5G wireless communication systems. The method comprises the following steps of first, calculating an average function, specifically, calculating an average function of robust solitary wave distribution according to a robust solitary wave distribution definition, and performing approximation processing;second, analyzing monotony of the average function, so as to obtain a maximum of the average function; and third, calculating a degree distribution optimization parameter of the digital fountain code.

The invention discloses a BATS code encoding method based on regular variable node degree distribution. The BATS code encoding method comprises the following steps: 1) a source node randomly selects adegree value d according to a check node degree distribution function omega; 2) the source node selects d input data packets with minimum variable node degree values to perform fountain coding, generates coded blocks with the same size, sets a block identifier for coded data in each coded block, and broadcasts the coded blocks to the relay node; 3) after receiving the coding block, the relay nodeperforms random linear network coding on the coding group in the block, and broadcasts the recoded coding block to the destination node; and 4) the destination node decodes the coded data packet fromthe relay node and recovers the input data. According to the method, all the input groups have the same variable node degree value by regularizing the variable node degree value. It is guaranteed that each input group can participate in the encoding process. The error leveling performance of a traditional BATS code is improved, and the decoding expenditure is reduced.

The invention provides an LT code degree distribution design method and device. A bit error rate and the decoding cost can be reduced. The decoding efficiency is improved. The method comprises the steps of determining a packet number of a to-be-coded source data packet based on a distribution function for PMRSD degree distribution; generating a coding generation matrix G <KxN > according to the total number K of source data packets, the total number N of coding data packets and the packet number of the to-be-coded source data packet; carrying out module 2 multiplication on the source data packets and the G <KxN >, thereby obtaining the coding data packets, and sending the coding data packets to a receiving end; generating the coding generation matrix G <KxN > at the receiving end, judging whether a list of which degree value d=1 exists in the generated G <KxN > or not, if the list exists, assuming that the source data packet s corresponding to a point (i, j) of the degree value d=1 in the G <KxN > is equal to the received coding data packet c<j >, and adding up a decoding counter count and 1; and assuming that a value of the coding data packet c<j > related to the s is equal to the exclusive or of the value of the original coding data packet c<j > and the s, setting a value of an element related to the s in the G <KxN > as 0, and finishing decoding when the count is equal to K. The method and the device relate to the technical field of communication.

The present invention relates to a method for encoding and decoding an online fountain code with unequal error protection strategy, comprising: step A: an encoder selects a window W according to an extended window strategy 1 or W 2 , the coded symbol with coding degree 2 is sent to the receiving end; Step B: the receiving end receives the coded symbol with coding degree 2 and the corresponding source code symbol sequence number and is used to form different connection groups; Step C: Repeat step A and step B, When the number of elements in the connection group with the largest number of elements in MISs reaches the preset value k 1 alpha 0 When the receiving end feeds back to the encoding end, the encoding end stops encoding and sending the coded symbols with the coding degree of 2 after receiving the feedback; Step D: the coding end obtains the coded symbols with the coding degree of 1 from the MISs and sends it to the receiving end; Step E : The receiving end receives the coded symbol with a coding degree of 1 and the corresponding source symbol serial number and uses it to decode the connection group, etc. Compared with the prior art, the present invention has the advantages of reducing decoding overhead on the premise of ensuring unequal error protection performance.

The invention relates to an LT code and multi-connection combined low-delay channel coding method, and belongs to the technical field of channel coding. According to the method, the degree distribution function of the LT code is optimized, namely, the degree distribution function of double-proportionality coefficient joint degree distribution is determined. And determining an optimal proportionality coefficient according to a channel condition. Then the coded symbols are generated by using the optimized degree distribution function, and the coded symbols are transmitted through two links, and the coded symbols received in the two links are mixed at a receiving end, thereby carrying out confidence hard decision decoding. According to the method, better performance is achieved in terms of indexes of decoding delay and communication system stability compared with HARQ and traditional multi-connection, the bit error rate of the LT code after optimization of the degree distribution function is remarkably reduced during transmission, and the decoding overhead can be lower than 10<-5> when reaching 0.5.

The invention relates to a fountain-code encoding method with feedback and the unequal error protection capacity. Under some application scenarios, parts of data sets need to be encoded preferentially. The fountain-code encoding method includes the steps of firstly, sequentially processing all input symbols through Bernoulli random experiments; secondly, starting to encode the input symbols through an encoder with an encoding method of standard LT codes; thirdly, when the serial number of a codeword received by a decoder is larger than or equal to the number of the input symbols, feeding the number of most important bits recovered through the decoder and the number of least important bits recovered through the decoder back to the encoder; fourthly, designing a most important increasing-degree generator according to the feedback information to replace a standard-degree generator to encode the most important bits, and designing a least important increasing-degree generator according to the feedback information to replace a standard-degree generator to encode the least important bits. According to the fountain-code encoding method, an encoding structure of the standard LT codes is improved, different encoding methods are adopted for the bits with different important degrees, and the important bits are preferentially recovered.

The invention discloses a degree distribution function design method of network layer fountain code and channel joint encoding. The method comprises the following steps: importing a channel deletion probability and an error correction probability of MP joint decoding into an EISD degree distribution function, and determining the degree distribution function of a signal source to send an encoding packet by an expression of a channel deletion and error correction probability influence function and the expression of a Per-Pc-EISD degree distribution function; importing a strong robust factor, and determining an expanded Per-Pc-EISD degree distribution function based on the channel deletion probability and the error correction probability; performing transfer and normalization processing on the Per-Pc-EISD degree distribution function, and determining the degree distribution function of joint encoding of network layer fountain code encoding and physical layer channel encoding. According to the degree distribution function design method disclosed by the invention, when the Per-Pc-EISD degree distribution function is designed, the probability of restoring a plurality of wrong data packets during the encoding and the channel deletion probability are imported into the degree distribution function, with respect to the joint encoding method of adopting fountain code encoding on a network layer and adopting channel encoding on a physical layer, the decoding cost is effectively reduced, and the reliability and speed of wireless transmission are improved.

The invention discloses an erasure code-based RDMA network data transmission method. The method includes the following steps: (1) The sending end obtains application data, divides the data into data frames of a fixed size, and then divides each frame of data Divide into k data blocks of the same size, and then send them to the receiving end; (2) If there are still data blocks that have not arrived at the receiving end within the specified time threshold, the sending end encodes the k data blocks to generate m checksums block, and send the check block to the receiving end; (3) the receiving end can recover a frame of data after receiving any k of the k+m blocks, and completes a data transmission when all data frames are received. The invention generates redundant data through the erasure code so that the receiving end does not have to wait for the data packet on the delay path, thereby reducing the transmission delay; through the erasure code hardware unloading, the calculation overhead of the CPU is not increased.

The application provides a data sending method, receiving method and device. The method comprises the following step: sending equipment divides a to-be-sent transmission block into at least two codingblocks, a bit of odd-even check bit is added in at least one coding block in at least two coding blocks, the LDPC coding is performed on each coding block after adding the odd-even check bit to obtain a data bit sequence after LDPC coding, and the data bit sequence is sent to receiving equipment; the receiving equipment receives multiple data bit sequences, decodes the same and extracts odd-evencheck bit from the coding block added with the odd-even check bit, the coding block is checked according to the odd-even check bit, and a bit of odd-even check bit is only added on the coding block, thereby effectively reducing the decoding expenditure at a receiving end and saving the decoding and transmission resource.

The invention relates to a high-coding symbol value broadcasting method based on system online fountain codes, and belongs to the technical field of channel coding, fountain codes and wireless broadcasting. The method comprises the following steps: 1) performing initialization; 2) generating and sending a first type of coding symbols; 3) receiving and processing the first type of coding symbols; 4) repeating the steps 2) and 3) until the sending number of the first type of coding symbols reaches a set parameter; 5) enabling a decoder to count the recovery proportion and generate feedback; 6) generating and sending a second type of coding symbols; 7) receiving and processing the second type of coding symbols; 8) processing the coded symbol with the degree value of 1; 9) processing the codedsymbol with the degree value of 2; 10), repeating steps 5) -9) till decoders at all receiving ends finish coding. under the condition that broadcast channel receiving ends are heterogeneous and are not provided with the decoders, the number of feedback retransmission times during fountain code decoding is effectively reduced, the decoding expenditure of users with good channel states and poor channel states is reduced, and the system throughput is improved.

The invention provides a signal processing method and device, electronic equipment and a storage medium. The signal processing method comprises the following steps: sampling a Manchester encoding signal; determining a jump edge of the Manchester coded signal according to sampling data obtained by sampling; determining whether the nth jump edge is an effective edge or not based on the time interval between the occurrence time of the nth jump edge and the occurrence time of the (n-1) th jump edge of the Manchester coded signal; n is a positive integer greater than 1; and outputting decoding data of the effective edge corresponding to the Manchester encoding signal. Therefore, the effective jump edge in the coded signal can be accurately identified, and the Manchester coded signal can be accurately decoded.

The invention relates to an encoding and decoding method of an online fountain code with an unequal error protection strategy. The encoding and decoding method comprises the following steps: step A, an encoder selects a window W1 or W2 and an encoding symbol with an encoding degree of 2 according to an extended window strategy and sends the encoding symbol to a receiving end; step B, the receiving end receives the coding symbol with the coding degree of 2 and the corresponding source code symbol sequence number and forms different connection groups; step C, the step A and the step B are repeated, when the number of the elements in the connection group with the largest number of the elements in the MISs reaches a preset value k1 alpha 0, the receiving end feeds back to the coding end, andthe coding end stops coding and sending of the coding symbol with the coding degree of 2 after receiving the feedback; step D, the encoding end encodes an encoding symbol with the encoding degree of 1from the MISs and sends the encoding symbol to the receiving end; and step E, the receiving end receives the coded symbol with the coding degree of 1 and the corresponding source code symbol sequencenumber and decodes the connection group and the like. Compared with the prior art, the method has the advantages of reducing decoding overhead and the like on the premise of ensuring unequal error protection performance.

The invention discloses an adaptive coding and decoding method under plasma sheath based on channel feedback and mainly solves the problem that in an existing communication mode, under the condition that a dynamic plasma sheath has depth attenuation influences on signals, the reliable transmission of important information cannot be realized. The realization scheme comprises the steps that 1, a transmitting antenna standing wave ratio of an aircraft is taken as channel feedback quantity and a corresponding relationship between the standing wave ratios and channel communication quality is established; 2, on the basis of the advantages of fountain code unidirectional link communication, classified coding is carried out on to-be-transmitted information in an LT coding mode of a fountain code according to a windowing rule distribution function, and the information classification number, the windowing rule distribution function and a coding packet length are adjusted in real time according to the channel communication quality, thereby realizing key protection of the important information; and 3, pseudo code coding is carried out on a fountain code coding packet. According to the method,a utilization rate of the coding packet and the channel transmission reliability are improved, and the method can be applied to telemetry and telecontrol communication of the aircrafts such as a hypersonic aircraft and a reentry aircraft which are packaged by the plasma sheaths in a near space.

The invention discloses a signal processing method and device, comprising: obtaining the position of expected continuous error bits in the data block to be transmitted; obtaining the position of the target interleaving bit in the data block to be transmitted; wherein, the target interleaving bit is obtained by less than the preset The number of iterations of the iteration threshold can recover the bits of the information; the bits at positions where continuous error bits are expected to occur and the bits at positions where target interleaved bits are expected to be interleaved with each other. It can be seen from the embodiment of the present invention that since the target interleaved bits are interleaved to the position where the continuous error bit is expected to occur, the expected continuous error bit is interleaved to the position where the information can be easily recovered, so that the position where the continuous error bit is expected to occur Both are bits that are easy to recover information, thus simplifying the subsequent decoding process and reducing the decoding overhead.

The invention relates to a low-delay channel coding method combining LT codes and multiple connections, and belongs to the technical field of channel coding. The method optimizes the degree distribution function of the LT code, that is, determines the degree distribution function of the joint degree distribution of the dual proportional coefficients, and determines the optimal proportional coefficient according to the channel conditions, and uses the optimized degree distribution function to generate coded symbols, through Two links are used for transmission, and the encoded symbols received in the two links are combined at the receiving end to perform confident hard-decision decoding. This method achieves better performance than HARQ and traditional multi-connection in terms of decoding delay and communication system stability indicators. The LT code after optimizing the degree distribution function has achieved a significant reduction in bit error rate during transmission. Overhead can be lower than 10 at 0.5 ‑5 .

The invention discloses a signal processing method and device. The method comprises the following steps: acquiring a position where continuous error bits are expected to appear in a to-be-transmitteddata block; obtaining the position of a target interleaving bit in the to-be-transmitted data block, wherein the target interleaving bits are bits capable of recovering information through iteration times smaller than a preset iteration threshold value; interleaving the bits at the location where the consecutive error bits are expected to appear and the bits at the location where the target interleaved bits with each other. According to the embodiment of the invention, the target interleaving bits are interleaved to the positions where continuous error bits are expected to appear; the expectedcontinuous error bits are interleaved to the positions where the bits of the information are easy to recover, so that the positions where the continuous error bits are expected to appear are the bitswhere the information is easy to recover, the subsequent decoding process is simplified, and the decoding expenditure is reduced.