WO2008071085A1 - Method and system of error concealment - Google Patents
Method and system of error concealment Download PDFInfo
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- WO2008071085A1 WO2008071085A1 PCT/CN2007/003547 CN2007003547W WO2008071085A1 WO 2008071085 A1 WO2008071085 A1 WO 2008071085A1 CN 2007003547 W CN2007003547 W CN 2007003547W WO 2008071085 A1 WO2008071085 A1 WO 2008071085A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
- H04N19/174—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a slice, e.g. a line of blocks or a group of blocks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
- H04N19/89—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving methods or arrangements for detection of transmission errors at the decoder
- H04N19/895—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving methods or arrangements for detection of transmission errors at the decoder in combination with error concealment
Definitions
- the embodiments of the present invention relate to the field of video transmission technologies, and specifically relate to a method for intercepting errors, a sending end of a system, and a receiving end. Background technique
- Orthogonal Frequency Division Multiplexing (OFDM) technology will become the main modulation technology for broadband wireless transmission.
- OFDM Orthogonal Frequency Division Multiplexing
- the OFDM channel has characteristics of time-varying and frequency selective fading, and error is easily generated during transmission.
- the transmission of video data in an OFDM channel is easily affected by bit errors.
- bit errors Especially in the case of bursty errors, a large amount of packet loss occurs in video transmission, resulting in a large video block loss at the receiving end, which seriously affects video data recovery. quality.
- the receiving end needs to mask the error data to recover the original video data as much as possible.
- FIG. 1 is a schematic diagram of a process of transmitting video data on an OFDM channel and performing error concealment. As shown in FIG. 1, the process mainly includes the following steps:
- Step 101 Receive video data.
- Step 102 Perform channel coding on the video data.
- Step 103 Perform Quadrature Amplitude Modulation (QAM) fast on the encoded data.
- QAM Quadrature Amplitude Modulation
- Step 104 Insert a pilot signal in the set OFDM subchannel.
- Step 105 Perform an inverse fast Fourier transform (IFFT, Inverse Fast Fourier Transform) on the QAM mapped data and the inserted pilot signal to obtain an OFDM symbol.
- IFFT inverse fast Fourier transform
- Step 106 Insert a guard interval between each OFDM symbol to obtain a complete OFDM signal.
- Confirmation Step 107 After receiving the OFDM signal, the receiving end performs a removal guard interval, Fast Fourier Transform (FFT), and performs channel feature estimation and correction according to the inserted pilot signal, and obtains original video compressed data after channel decoding. .
- FFT Fast Fourier Transform
- Step 108 The receiving end decompresses the video compressed data, and detects that there is a video data error, according to the characteristics of the error, such as: the location of the error, and the time domain masking, such as: the position in the adjacent frame and the occurrence The position-related video number of the erroneous data, or the spatial domain masking, such as: adjacent video data of the same frame, masks the error and recovers the video data.
- the characteristics of the error such as: the location of the error
- the time domain masking such as: the position in the adjacent frame and the occurrence
- the position-related video number of the erroneous data or the spatial domain masking, such as: adjacent video data of the same frame, masks the error and recovers the video data.
- the transmitting end When the transmitting end performs channel coding, some verification information is inserted into the video data, and the receiving end can use the verification information to detect whether the video data has a bit error.
- Embodiments of the present invention provide a method for masking errors, and a system for transmitting and receiving ends to improve error concealment efficiency.
- a method of error concealing comprising:
- the transmitting end receives the video compressed data, and divides the video compressed data into a slice structure; allocates the adjacent slice structure to the non-adjacent orthogonal frequency division multiplexing subchannel or subchannel group, and sends the slice structure to the receiving End
- An error concealing system includes: a transmitting end and a receiving end, wherein: the transmitting end is configured to, after receiving the externally input video compressed data, split the video compressed data into a slice structure, and allocate the adjacent slice structure Transmitting each slice structure to a receiving end on a non-adjacent OFDM subchannel or subchannel group;
- the receiving end is configured to read a slice structure on each OFDM subchannel or subchannel group sent by the transmitting end, and detect that a chip structure has a bit error, according to a slice structure related to the slice structure in time or space.
- the structure of the sheet is error-masked.
- a transmitting end comprising: a slice dividing module and a frequency domain interleaving module, wherein: a slice dividing module, configured to divide externally input video compressed data into a slice structure, and send each slice structure to a frequency domain interleaving module;
- the frequency domain interleaving module is configured to allocate the adjacent slice structure of the received current video frame to the non-adjacent OFDM subchannel or subchannel group, and send each slice structure to the receiving end.
- a receiving end includes: a frequency domain deinterleaving module, a decompression and error detecting module, and an error concealing module, wherein:
- the frequency domain deinterleaving module is configured to read a slice structure on each OFDM subchannel or subchannel group sent by the transmitting end, sort each slice structure, and send the sorted slice structure to the decompression and error detection module. ;
- the decompression and error detection module is configured to perform decompression processing on the received slice structure, and when detecting the error of the slice structure, send the slice structure information to the error concealment module;
- the error concealing module receives the slice structure information sent by the decompression and error detection module, and performs error concealment on the slice structure according to a slice structure related to the slice structure in time or space.
- the transmitting end 1 ⁇ video compression data into a sheet structure by the transmitting end 1 ⁇ video compression data into a sheet structure, the structure of the distribution plate adjacent to the non-adjacent OFDM subchannels or groups of subchannels, the same video frame is greatly reduced The probability of error occurrence occurs in the inner adjacent slice structure at the same time, thereby greatly improving the error concealing efficiency and improving the video recovery amount;
- the embodiment of the present invention greatly reduces the same video frame by updating the allocation rules of allocating adjacent slice structures to non-adjacent OFDM subchannels or subchannel groups.
- the probability that the slice structure of the location has a bit error at the same time further improves the error concealing efficiency and the video recovery quality.
- 1 is a schematic diagram of a conventional process of transmitting video data on an OFDM channel and performing error concealment
- FIG. 2 is a flowchart of transmitting video data on an OFDM channel and performing error concealment according to an embodiment of the present invention
- FIG. 3 is a flowchart of transmitting video data on an OFDM channel and performing error concealment when the video compression data is directed to a streaming application according to Embodiment 1 of the present invention
- FIG. 4 is a flowchart of transmitting video data on an OFDM channel and performing error concealment when the video compression data is directed to a packet application according to Embodiment 2 of the present invention
- 5-1, 5-2, and 5-3 are examples of performing error concealment after frequency domain interleaving of video compression data according to an embodiment of the present invention.
- 6-1, 6-2, and 6-3 are examples of error concealing after performing frequency domain interleaving and time domain interleaving on video compressed data according to an embodiment of the present invention
- FIG. 7 is a schematic structural diagram of a system for transmitting video compressed data on an OFDM channel and performing error concealment according to an embodiment of the present invention
- FIG. 8 is a schematic structural diagram of a sending end according to an embodiment of the present disclosure.
- FIG. 9 is a schematic structural diagram of a frequency domain interleaving module of a transmitting end according to an embodiment of the present invention.
- FIG. 10 is a schematic structural diagram of a frequency domain interleaving module of a transmitting end according to an embodiment of the present invention.
- FIG. 11 is a schematic structural diagram of a receiving end according to an embodiment of the present invention. detailed description
- the core idea of the embodiment of the present invention is that the transmitting end divides the input video compressed data into a slice structure, and then allocates the adjacent slice structure to the non-adjacent OFDM.
- the subchannel or the subchannel group is sent to the receiving end, and the receiving end reorders the Slice structures on the received OFDM subchannels or subchannel groups, and performs error detection. When a fault occurs in the Slice structure is detected. Then, according to the Slice structure related to the Slice structure in time or space, the Slice structure is error-masked.
- a method of allocating adjacent Slice structures to non-adjacent OFDM subchannels or subchannel groups is called a frequency domain interleaving method.
- the allocation rule for allocating the slice structure to the OFDM subchannel or the subchannel group may be changed at intervals, that is, different frequency domain interleaving methods are adopted at different times, and the method is adopted. It is called time domain interleaving.
- FIG. 2 is a flowchart of performing error concealment when transmitting video compression data on an OFDM channel according to an embodiment of the present invention. As shown in FIG. 2, the specific steps are as follows:
- Step 201 Receive video compression data.
- Step 202 Divide the received video compressed data into a Slice structure.
- the segmentation method of the Slice structure is defined.
- the Slice structure of the video compression data can be segmented according to the adopted video compression standard.
- Step 203 Determine whether the Slice allocation rule update condition is currently met. If yes, go to Step 204; otherwise, go to Step 205.
- Step 204 According to a preset slice allocation rule, the adjacent slice structure is allocated to the non-adjacent OFDM subchannel or subchannel group by using a different slice allocation rule from the previous video frame, and the process proceeds to step 206.
- Step 205 Allocating adjacent slice structures to non-adjacent OFDM subchannels or subchannel groups by using the same Slice allocation rule as the previous video frame.
- Step 206 Perform channel coding, spatial domain interleaving, QAM mapping, and slice structure allocated to each OFDM subchannel or subchannel group.
- Step 207 Insert a pilot signal on the set OFDM subchannel, and combine the data obtained by the QAM mapping of the slice structure with the inserted pilot signal to obtain an OFDM signal by using an IFFT and an insertion guard interval, and then send the OFDM signal. To the receiving end.
- the spatial domain interleaving method used in this step is the same as the spatial domain interleaving method in the prior art.
- Step 208 After receiving the OFDM signal, the receiving end performs the removal of the guard interval, the FFT, the channel correction according to the inserted pilot signal, and the channel decoding, and then obtains the original Slice structure on each OFDM subchannel or subchannel group.
- Step 209 The receiving end decompresses and detects the video compressed data composed of the slice structure, and detects that a slice structure has a bit error, and according to the Slice structure successfully received in time or space related to the Slice structure. , error-masking the slice structure.
- the Slice structure related in time to the slice structure in which the error occurs is the Slice structure located in the reference video frame of the video frame in which the errored slice structure is located and related to the location of the slice structure in which the error occurred.
- the reference video frame may be the previous frame or the first two frames of the current video frame, and the reference video frame information is sent to the decoding end through the compressed code stream;
- the Slice structure is composed of macroblocks, each of which contains motion vector information.
- the motion vector information indicates a distance that the macroblock moves in the current video frame relative to the reference video frame, and therefore, according to the motion vector information in each macroblock, the macroblock can be found in the reference video frame.
- the closest position is: The most relevant macroblock.
- the macroblock most relevant to the macroblock can be found in the reference video frame according to the information in the macroblock, so that the macroblock can be obtained according to the macroblock. Error concealing the macroblock in which the error occurred.
- a Slice structure spatially associated with a slice structure in which an error occurs is a Slice structure that is located in the same video frame as the slice structure in which the error occurred and that is adjacent to the slice structure in which the error occurred.
- a certain macroblock in the slice structure is erroneous, error is being made.
- a macroblock located in the previous slice structure or the latter slice structure of the slice structure and at the same position or adjacent position of the slice where the errored macroblock is located in the slice structure may be used to make an error in the macroblock in which the error occurred. Code masking.
- video compression data When video compression data is transmitted on an OFDM channel, it is divided into a stream-oriented application and a packet-based application.
- the receiving end For the former application, the receiving end must know the Slice allocation rule adopted by the transmitting end when assigning the Slice structure to the OFDM subchannel or subchannel group, so as to be on the received OFDM subchannel or the Slice on the subchannel group.
- the structure is reordered to recover the original video compressed data; and for the latter application, since the video compressed data is transmitted in packets, each slice structure contains several packets, each packet having a packet number, the packet The number is sent to the receiving end together with the packet data.
- the receiving end does not need to know the Slice allocation rule adopted by the transmitting end to allocate the Slice structure to the OFDM subchannel or the subchannel group, and only needs to be grouped according to each packet in the Slice structure.
- the number reorders the Slice structure to get the raw video compression data.
- the video compression is provided separately in the following: according to the stream-oriented application and the packet-oriented application, the error concealment method provided by the embodiment of the present invention.
- FIG. 3 is a flowchart of transmitting and performing error concealment on an OFDM channel when the video compressed data is applied to a streaming application according to Embodiment 1 of the present invention. As shown in FIG. 3, the specific steps are as follows:
- Step 301 The sender receives the video compressed data stream.
- Step 302 The sender divides the received video compression data into a Slice structure.
- Step 303 The sending end determines whether the Slice allocation rule update condition is currently met. If yes, go to step 304; otherwise, go to step 305.
- Step 304 According to a preset slice allocation rule, using a slice allocation rule that is not the same as the previous video frame, - assigning adjacent slice structures to non-adjacent OFDM subchannels or subchannel groups, and The currently updated slice allocation rule information is allocated to the preset OFDM subchannel, and the flow proceeds to step 306.
- Each OFDM subchannel or subchannel group corresponds to a buffer, and the transmitting end allocates the Slice structure to a buffer corresponding to the OFDM subchannel or subchannel group.
- Slice allocation rules can be updated every predetermined number of frames, and the sender detects when If the number of previously received video frames is equal to the number of predetermined slice allocation rule update video frames, then the slice allocation rule is updated; or, every predetermined time period is updated, and the transmitting end detects that the current time reaches the scheduled update time, then the slice allocation rule is updated.
- the receiving end when the receiving end performs channel feature estimation on the OFDM subchannel, if the channel quality of the OFDM subchannel is detected to be worse, such as: lower than the predetermined channel quality, Sending a slice allocation rule update indication to the transmitting end; or performing channel decoding on the data on the OFDM subchannel or the subchannel group, if the data is detected to generate an error, and the number of errors or the number of uncorrectable errors reaches the pre If the threshold is set, the slice allocation rule update indication is sent to the sending end; or, when the video compressed data composed of the Slice structure is decompressed, if a slice structure is detected to have an error, and the number of errors reaches the preset Threshold, then send a Slilce allocation rule update indication to the sender.
- the currently updated slice allocation rule information is specifically allocated to which OFDM subchannel, which may be determined in advance by the transmitting end and the receiving end, or preconfigured by the network administrator to the transmitting end and the receiving end.
- the Slice allocation rule information is usually allocated to an idle OFDM subchannel that is not occupied by the Slice structure.
- the first idle OFDM subchannel not occupied by the Slice structure is preset to store the currently updated Slice allocation rule information.
- the sequence numbers are 0 to 21, respectively, wherein the subchannels with sequence numbers 0 to 19 have been assigned to the slice structure, and the subchannel with sequence number 20 can be used to transmit the currently used slice.
- the allocation rule information, the subchannel numbered 21 is used to transmit other control information and the like. If the OFDM subchannels are all occupied by the slice structure, the slice allocation rule information is allocated to an OFDM subchannel together with a slice structure.
- Step 305 Allocating adjacent slice structures to non-adjacent OFDM subchannels or subchannel groups by using the same Slice allocation rule as the previous video frame.
- Step 306 Perform channel coding, spatial domain interleaving, and QAM mapping on the slice structure allocated to each OFDM subchannel or subchannel group.
- Step 307 Insert a pilot signal on the set OFDM subchannel, and combine the data obtained by the QAM mapping of the slice structure with the inserted pilot signal to obtain an OFDM signal by using an IFFT and an insertion guard interval, and then send the OFDM signal.
- Step 308 After receiving the OFDM signal, the receiving end sequentially performs the removal of the guard interval, the FFT, the channel feature estimation and correction according to the inserted pilot signal, and the channel decoding to obtain the original slice structure on each OFDM subchannel or subchannel group.
- Step 309 The receiving end determines whether there is updated slice allocation rule information on the preset OFDM subchannel, and if yes, step 310 is performed; otherwise, step 311 is performed.
- Step 310 The receiving end updates the slice allocation rule information currently saved by the slice allocation rule information, and sorts the slice structure on each OFDM subchannel or subchannel group according to the updated slice allocation rule information, and proceeds to step 312. .
- Step 311 The receiving end performs the sequence of the Slice structure on each OFDM subchannel or subchannel group according to the slice allocation rule information currently saved by the receiving end.
- Step 312 The receiving end decompresses the video compression data composed of the Slice structure to determine whether there is a bit error in the Slice structure. If yes, go to Step 313; otherwise, the process ends without processing.
- Step 313 The receiving end determines whether the slice structure in the adjacent video frame that is in the same position as the fragmented slice structure is successfully received. If yes, go to step 314; otherwise, go to step 315.
- Step 314 The receiving end performs error concealment on each slice structure in which the error occurs according to the slice structure at the same position in the adjacent video frame, and the process ends.
- the adjacent video frame may be the previous frame of the current video frame or the next frame of the current video frame, and the like.
- Step 315 The receiving end performs error concealment on each slice structure in which the error occurs according to the slice structure adjacent to the slice structure that is successfully received according to the current video frame.
- the adjacent slice structure may be the previous slice structure or the latter slice structure of the current slice structure in the same video frame.
- the slice allocation rule information when the slice allocation rule information is allocated on the preset OFDM subchannel, the slice allocation rule information may not participate in channel coding, spatial domain interleaving, QAM mapping, and the like.
- the IFFT and the insertion guard interval processing are directly performed together with the Slice structure on the other OFDM subchannels; accordingly, only the data on the preset OFDM subchannel is removed at the receiving end to remove the guard interval and After the IFFT processing, the original slice allocation rule information can be obtained without channel feature estimation and correction, QAM inverse mapping, spatial domain deinterleaving, and channel decoding processing.
- the sender and the receiver may also pre-negotiate the adopted slice allocation rules and assign rule update conditions before transmitting the video compressed data stream; or, the network administrator may assign the rules to the rules, and
- the allocation rule update condition is pre-configured on the sender and the receiver.
- FIG. 4 is a flowchart of error concealment of a video compression data for a packet application according to Embodiment 2 of the present invention. As shown in FIG. 4, the specific steps are as follows:
- Step 401 The sender receives the video compressed packet data.
- Step 402 The sender divides the received video compressed packet data into a Slice structure.
- Step 403 The sender determines whether the slice allocation rule update condition is currently satisfied. If yes, step 404 is performed; otherwise, step 405 is performed.
- Step 404 The transmitting end allocates the adjacent slice structure to the non-adjacent OFDM subchannel or subchannel group according to a preset slice allocation rule according to a slice allocation rule different from the previous video frame, and proceeds to the step. 406.
- Step 405 The transmitting end allocates the adjacent slice structure to the non-adjacent OFDM subchannel or subchannel group by using the same Slice allocation rule as the previous video frame.
- Step 406 The transmitting end sequentially performs channel coding, spatial domain interleaving, and QAM mapping on the slice structure allocated to each OFDM subchannel or subchannel group.
- Step 407 Insert a pilot signal on the set OFDM subchannel, and combine the data obtained by the QAM mapping of the slice structure with the inserted pilot signal to obtain a complete OFDM signal after the IFFT and the insertion guard interval, and obtain the complete OFDM signal.
- the signal is sent to the receiving end.
- Step 408 The receiving end receives the OFDM signal ⁇ , and sequentially removes the guard interval, the FFT, the data according to the inserted pilot signal for channel feature estimation and correction, and the channel decoding process, and obtains the original Slice structure on each OFDM channel.
- Step 409 The receiving end sorts the slice structure according to the grouping number of each grouping data in the slice structure.
- Step 410 The receiving end decompresses the video compressed data composed of the Slice structure. If the process is reduced, it is determined whether there is a bit error in the slice structure. If yes, go to step 411; otherwise, if no processing is done, the process ends.
- Step 411 The receiving end determines whether the slice structure in the adjacent video frame that is in the same position as the fragmented slice structure is successfully received. If yes, step 412 is performed; otherwise, step 413 is performed.
- Step 412 The receiving end performs error concealment on each slice structure in which the error occurs according to the slice structure at the same position in the adjacent video frame, and the process ends.
- Step 413 The receiving end performs error concealment on each slice structure in which the error occurs according to the slice structure adjacent to the fragment structure in which the error is successfully received according to the current video frame.
- Figure 5-1 is a schematic diagram of partitioning of a Slice structure of video compressed data
- Figure 5-2 is a schematic diagram of allocation of each Slice structure on each OFDM subchannel when frequency-domain interleaving is not performed on video compressed data
- Figure 5-3 is a pair Schematic diagram of the allocation of each slice structure on each OFDM subchannel when the video compression data is frequency domain interleaved.
- Slicel ⁇ 4 may be affected by the error at the same time, because Slicel ⁇ 4 is Adjacent areas, therefore, can cause video compression data in a large area to be unable to perform effective error concealment, so that the correct video compression data cannot be recovered.
- the video compression data is frequency-domain interleaved, since one slice structure is transmitted on only one OFDM subchannel, the errors of subchannels 4 and 5 only affect Slice3 and Slice6, so that it is easy to use Slice2.
- Slice4 performs error concealment on Slice3, and masks the Slice6 by Slice5 and Slice7, so that the error data can be effectively recovered.
- Figure 6-1 is a schematic diagram of segmentation of a slice structure of video compression data
- Figure 6-2 is a schematic diagram of allocation of each slice structure on each OFDM subchannel after adopting a frequency domain interleaving method at time t0
- a schematic diagram of the allocation of each slice structure on each OFDM subchannel after another frequency domain interleaving method is used at time t1.
- the burst error is affected at different times. The position of the slice structure is different, so that the error occurs due to the slice structure of the same position, and the slice structure of the same position is always unable to be successfully received, thereby affecting the occurrence of effective recovery of the video compressed data.
- the frequency domain interleaving method in the embodiment of the present invention only needs to ensure that the adjacent slice nodes are allocated to the non-adjacent OFDM subchannels or subchannel groups, and three frequency i or interleaving methods applied in the embodiments of the present invention are given below. .
- ⁇ is ⁇ in the following formula, which is a rational number, which means that the ⁇ is rounded down.
- mapping relationship between the sequence number of the Slice structure and the sequence number of the OFDM subchannel or subchannel group is as follows: x i
- N 9, the method using the second parity interleave, ⁇ Slice No. Structure 'of OFDM subchannels, or subchannels group ID [zeta]' 'mapping relationships:
- mapping relationship between the sequence number ⁇ '' of the Slice structure and the sequence number z ' of the OFDM subchannel or subchannel group is given when the total number N of the Slice structures is even 10 and odd 9:
- N 10
- the bipartite alternate method A ⁇ Slice No. Structure 'of OFDM subchannels and the number of subchannel groups or [zeta]' mapping relationships:
- the serial number x of the Slice structure is Mapping of sequence numbers of OFDM subchannels or subchannel groups:
- mapping relationship between the sequence number of the Slice structure and the sequence number z ' of the OFDM subchannel or subchannel group is given when the total number of Slice structures N is even 10 and odd 9:
- N 10
- the bipartite alternate method B ⁇ Slice No. Structure 'and the OFDM subchannels, or subchannels group number [zeta]' mapping relationships: x i
- N 9
- the bipartite alternate method B the mapping relationship between the sequence number of ⁇ 'Slice Structure and OFDM subchannels or sub-groups:
- the purpose of the time domain interleaving method in the embodiment of the present invention is to make the same video frames
- the slice structure at a location is mapped to different OFDM subchannels or subchannel groups, so that when some OFDM subchannels or subchannel groups exhibit long-term fading and the Slice structure is erroneous, the adjacent video frames can be used.
- the slice structure of the location is error-masked.
- the method may be performed in units of time intervals or video frames, repeating the same frequency domain interleaving method every predetermined time interval or every predetermined number of video frames, or in a predetermined predetermined time interval or adjacent predetermined number of videos. Different frequency domain interleaving methods are used in the frame.
- the sequence number of the video frame be M.
- the frequency i or the interleaving method uses the second parity interleave method; when M is an odd number, the frequency domain interleaving method uses the binary interleaving method A.
- the principle of the method is as follows: the same frequency domain interleaving method is repeated every predetermined time interval or every predetermined number of video frames, and different frequency domain interleaving methods are adopted in adjacent predetermined time intervals or a predetermined number of video frames, and The same or different frequency domain interleaving operations are performed twice in at least one predetermined time interval or a predetermined number of video frames.
- the sequence number of the video frame be M.
- the frequency i or the interleaving method adopts the binary interleaving method A; when M is an odd number, the first binary interleaving method is used first, and the result of the obtained one is used once again.
- FIG. 7 is a schematic diagram of a system composition for transmitting video compression data on an OFDM channel and performing error concealment according to an embodiment of the present invention. As shown in FIG. 7, the method mainly includes: a transmitting end 71 and a receiving end 72, where:
- the transmitting end 71 is configured to: after receiving the externally input video compressed data, split the video compressed data into a Slice structure, and allocate the adjacent Slice structure to the non-adjacent OFDM subchannel or subchannel group, The Slice structure is sent to the receiving end 72.
- the receiving end 72 is configured to read a Slice structure on each OFDM subchannel or subchannel group sent by the transmitting end 71, and detect that a slice structure has an error, according to a time or space related to the Slice structure.
- the slice structure successfully received, and the slice structure is error-coded.
- FIG. 8 is a schematic structural diagram of a transmitting end according to an embodiment of the present invention.
- the transmitting end 71 mainly includes: a slice splitting module 711, a time domain interleaving control module 712, a frequency domain interleaving module 713, a channel coding module 714, and a space.
- the slice splitting module 711 is configured to split the externally input video compressed data into a slice structure, and send each slice structure to the frequency domain interleaving module 713.
- the time domain interleaving control module 712 is configured to save a slice allocation rule update condition, and send an update indication to the frequency domain interleaving module 713 when the detection meets the update condition.
- the frequency domain interleaving module 713 is configured to save the slice allocation rule information, and when receiving the slice structure sent by the slice segmentation module 711, and receiving the update indication sent by the time domain interleaving control module 712, using the previous video frame
- the same slice allocation rule is configured to allocate the adjacent slice structure of the current video frame to the non-adjacent OFDM subchannel or subchannel group, and send each slice structure to the channel coding module 714; when the Slice segmentation module 711 is received Sending the slice structure, and receiving the update indication sent by the time domain interleaving control module 712, using the slice allocation rule different from the previous video frame, assigning the adjacent slice structure of the received current video frame to the phase difference Adjacent OFDM subchannel or subchannel group, Each slice structure is sent to channel coding module 714.
- the channel coding module 714 is configured to encode data on each OFDM subchannel or subchannel group sent by the frequency domain interleaving module 713, and send the encoded data to the spatial domain interleaving module 715.
- the spatial domain interleaving module 715 is configured to spatially interleave data on each OFDM subchannel or subchannel group sent by the channel coding module 714, and send the obtained data to the QAM mapping module 716.
- the QAM mapping module 716 is configured to perform QAM mapping on the data on each OFDM subchannel or subchannel group sent by the spatial domain interleaving module 715, and send the obtained data to the insertion pilot module 717.
- the insertion pilot module 717 is configured to receive data on each OFDM subchannel or subchannel group sent by the QAM mapping module 716, insert pilot data into the OFDM subchannel, and use data on each OFDM subchannel or subchannel. Sent to the IFFT module 718.
- the IFFT module 718 is configured to perform IFFT on the data on each OFDM subchannel or subchannel group sent by the inserted pilot module 717, and send the obtained data to the insertion protection interval module 719.
- the insertion guard interval module 719 is configured to insert a guard interval on data on each OFDM subchannel or subchannel group sent by the IFFT module 718, and send the obtained data to the receiver.
- FIG. 9 is a schematic structural diagram 1 of a frequency domain interleaving module according to an embodiment of the present invention. As shown in FIG. 9, the method mainly includes: an allocation rule update determining module 901, a slice structure allocating module 902, and a slice allocation rule information allocating module 903. :
- the allocation rule update determining module 901 is configured to send an allocation rule update indication to the slice structure allocation module 902 when receiving the update indication sent by the time domain interleaving control module 712.
- the slice structure allocation module 902 is configured to save the slice allocation rule information, and when the slice structure sent by the slice segmentation module 711 is received, and the allocation rule update instruction sent by the distribution rule update determination module 901 is not received, The same slice allocation rule of a video frame, the adjacent slice structure of the received current video frame is allocated to the non-adjacent OFDM subchannel or subchannel group, and each slice structure is sent to the speech coding module 714; When the Slice partitioning module 711 sends the Slice structure, and receives the allocation rule update indication sent by the allocation rule update determining module 901, the slice allocation rule is different from the previous video frame, and the received current video frame phase is received. The neighboring slice structure is allocated to the non-adjacent OFDM subchannels or subchannel groups, and each slice structure is sent to the channel coding module 714, and the currently used slice allocation rule information is sent to the slice allocation rule information distribution module 903.
- the slice allocation rule information distribution module 903 is configured to allocate slice allocation rule information sent by the slice structure allocation module 902 to the OFDM subchannel, and send the data on the OFDM subchannel to the channel coding module 714.
- FIG. 10 is a schematic structural diagram of a frequency domain interleaving module according to an embodiment of the present invention. As shown in FIG. 10, the method mainly includes: an allocation rule update determining module 1001, a slice structure allocating module 1002, and a slice allocation rule information allocating module 1003. :
- the allocation rule update determining module 1001 is identical to the allocation rule update determining module 901, the slice structure allocating module 1002 is identical to the slice structure assigning module 902, and the slice allocation rule information assigning module 1003 is different from the slice allocation rule information assigning module 903 in that After the slice allocation rule information distribution module 1003 allocates the slice allocation rule information sent by the slice structure allocation module 1002 to the OFDM subchannel, the data on the OFDM subchannel is transmitted to the IFFT module 718.
- FIG. 11 is a schematic structural diagram of a receiving end according to an embodiment of the present invention.
- the receiving end 72 mainly includes: a removal guard interval module 721, an FFT module 722, a channel correction module 723, a QAM inverse mapping module 724, and a spatial domain.
- the FFT module 722 is configured to perform FFT on the data on each OFDM subchannel or subchannel group sent by the removal guard interval module 721, and send the obtained data to the channel estimation correction module 723.
- the channel estimation correction module 723 is configured to perform channel feature estimation according to the pilot data on the OFDM subchannel sent by the FFT module 722, and correct the video compression data on each OFDM subchannel or subchannel according to the estimation result, and the obtained The data is sent to the QAM inverse mapping module 724.
- the QAM inverse mapping module 724 is configured to perform QAM inverse mapping on the data on each OFDM subchannel or subchannel group sent by the channel estimation correction module 723, and send the obtained data to the spatial domain deinterleaving module 725.
- the spatial domain deinterleaving module 725 is configured to spatially deinterleave data on each OFDM subchannel or subchannel group sent by the QAM inverse mapping module 724, and send the obtained data to the channel decoding module 726.
- the channel decoding module 726 is configured to decode data on each OFDM subchannel or subchannel group sent by the spatial domain deinterleaving module 725, and output the obtained data to the frequency domain deinterleaving module 727.
- the frequency domain de-interleaving module 727 is configured to read the Slice structure on each OFDM subchannel or subchannel group sent by the channel decoding module 726, and sort each Slice structure, and send the sorted Slice structure to the decompression and Error detection module 728.
- the decompression and error detection module 728 is configured to perform decompression processing on the video compression data formed by the slice structure sent by the frequency domain deinterleave module 727, and detect the correlation of the Slice structure when a bit error occurs in the Slice structure.
- the information includes: the frame identifier of the video frame in which the slice structure is located, the location information of the slice structure in the video frame, and the like are sent to the error concealment module 729.
- the error concealment module 729 receives the Slice structure information sent by the decompression and error detection module 728, and uses the adjacent video of the video frame in which the slice structure is located according to the Slice structure information, and the slice structure The position-dependent Slice structure, and/or the Slice structure successfully received in the video frame in which the Slice structure is located and adjacent to the Slice structure, is error-masked by the Slice structure.
- the receiving end 72 includes: a time domain deinterleaving control module 730: slice allocation rule information for configuring itself, or a pre-set OFDM subchannel sent from the channel decoding module 726 or the FFT module 722. Updated slice assignment rules The information is sent to the frequency domain de-interleaving module 727. Thereafter, the frequency domain de-interleaving module 727 sorts each slice structure according to the slice allocation rule information.
- the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way.
- the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium, including a plurality of instructions for making a A computer device (which may be a personal computer, server, or network device, etc.) performs the methods described in various embodiments of the present invention.
- a computer device which may be a personal computer, server, or network device, etc.
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Description
误码掩盖方法和系统 技术领域
本发明实施例涉及视频传输技术领域, 具体涉及误码掩盖方法、 系统 送端和接收端。 背景技术
随着通信技术的发展,视频流在无线信道上的传输应用已经提上 日程。 作为未来移动通信的核心技术, 正交频分复用 (OFDM, Orthogonal Frequency Division Multiplexing )技术将成为宽带无线传 输的主要调制技术。 然而 OFDM信道具有时变及频率选择衰落的特 征, 在传输过程中容易产生误码。 视频数据在 OFDM信道中传输很 容易受到误码的影响, 尤其在突发误码的状况下,视频传输会出现大 量的分组丢失,从而在接收端造成大片的视频块丢失, 严重影响视频 数据恢复质量。当存在误码时,接收端需要对误码数据进行错误掩盖, 以尽可能地恢复出原始视频数据。
图 1为现有的在 OFDM信道上传输视频数据并进行误码掩盖的 过程示意图, 如图 1所示, 该过程主要包括如下步骤:
步骤 101 : 接收视频数据。
步骤 102: 对视频数据进行信道编码。
步骤 103:对编码后的数据进行正交幅度调制(QAM, Quadrature Amplitude Modulation )快射。
—步骤 104: 在设定的 OFDM子信道中插人导频信号。
步骤 105: 对 QAM映射后的数据和插入的导频信号进行反快速 傅立叶变换 ( IFFT, Inverse Fast Fourier Transform )获得 OFDM符号。
步骤 106:在各 OFDM符号间插入保护间隔,得到完整的 OFDM 信号。
1
确认本
步驟 107: 接收端收到 OFDM信号后, 进行移除保护间隔、快速 傅立叶变换(FFT, Fast Fourier Transform ), 才艮据插入导频信号进行 信道特征估计及修正、 信道解码后得到原始视频压缩数据。
步骤 108: 接收端对视频压缩数据进行解压缩处理, 检测到有视 频数据发生误码, 则根据误码的特征如: 误码的位置, 通过时域掩盖 如: 相邻帧中位置与该发生误码的数据的位置相关的视频数椐、或空 间域掩盖如: 同一帧相邻的视频数据等方法对错误进行误码掩盖, 恢 复出该视频数据。
发送端在进行信道编码时, 会将一些校验信息插入视频数据中, 接收端可通过这些校验信息, 来检测视频数据是否发生了误码。
现有技术的缺点是: 当连续较多的误码出现时, 往往是多个相邻 OFDM子信道同时出现连续若干帧的误码, 即: 同一帧的相邻数据和 相邻帧同一位置的数据同时出现误码, 可以看出: 此时误码都发生在 连续帧的同一区域上, 因此,无法利用空间相关性或时间相关性对误 码数据进行有效的错误掩盖,从而无法正确恢复出原始视频数据, 导 致视频输出质量变差。 发明内容
本发明实施例提供误码掩盖方法、 系统以½送端和接收端, 以 提高误码掩盖效率。
本发明实施例的技术方案是这样实现的:
一种误码掩盖方法, 包括:
发送端接收视频压缩数据, 将该视频压缩数据分割成片结构; 分配相邻片结构到不相邻的正交频分复用子信道或子信道组上, 并将所述片结构发送到接收端;
接收端从所述 OFDM子信道或子信道组上读取所述片结构, 并 对所述片结构进行检测;
检测到有片结构发生误码,则根据在时间或空间上与该片结构相 关的片结构, 对该发生误码的片结构进行误码掩盖。
一种误码掩盖系统, 包括: 发送端和接收端, 其中: 发送端, 用于在收到外部输入的视频压缩数据后, 将该视频压缩 数据分割成片结构, 将相邻的片结构分配到不相邻的 OFDM子信道 或子信道组上, 将各片结构发送到接收端;
接收端, 用于读取发送端发来的各 OFDM子信道或子信道组上 的片结构,检测到有片结构发生误码, 则根据在时间或空间上与该片 结构相关的片结构, 对该片结构进行误码掩盖。
一种发送端, 包括: 片分割模块和频域交织模块, 其中: 片分割模块, 用于将外部输入的视频压缩数据分割成片结构, 将 各片结构发送给频域交织模块;
频域交织模块,用于将收到的当前视频帧的相邻片结构分配给不 相邻的 OFDM子信道或子信道组 , 将各片结构发送给接收端。
一种接收端, 包括: 频域解交织模块、 解压缩及误码检测模块、 误码掩盖模块, 其中:
频域解交织模块, 用于读取发送端发来的各 OFDM子信道或子 信道組上的片结构, 对各片结构进行排序, 将排序得到的片结构发送 给解压缩及误码检测模块;
解压缩及误码检测模块, 用于对收到的 Slice结构进行解压缩处 理, 在检测到片结构发生误码时, 将该片结构信息发送给误码掩盖模 块;
误码掩盖模块, 收到解压缩及误码检测模块发来的片结构信息, 根据在时间或空间上与该片结构相关的片结构,对该片结构进行误码 掩盖。
与现有技术相比,本发明实施例通过发送端^ 1视频压缩数据分割 成片结构, 将相邻片结构分配到不相邻的 OFDM子信道或子信道组 上, 大大降低了同一视频帧内相邻片结构同时发生误码的概率, 从而 大大提高了误码掩盖效率, 提高了视频恢复^:量;
进一步地,本发明实施例通过更新将相邻片结构分配到不相邻的 OFDM子信道或子信道组上的分配规则,大大降低了相邻视频帧同一
位置的片结构同时发生误码的概率,进一步提高了误码掩盖效率和视 频恢复质量。
附图说明
图 1为现有的在 OFDM信道传输视频数据并进行误码掩盖的过 程示意图;
图 2为本发明实施例提供的在 OFDM信道传输视频数据并进行 误码掩盖的流程图;
图 3 为本发明实施例一提供的视频压缩数据面向流应用时, 在 OFDM信道传输视频数据并进行误码掩盖的流程图;
图 4为本发明实施例二提供的在视频压缩数据面向分组应用时, 在 OFDM信道传输视频数据并进行误码掩盖的流程图;
图 5-1、 5-2和 5-3为本发明实施例提供的对视频压缩数据进行频 域交织后进行误码掩盖的实例;
图 6-1、 6-2和 6-3为本发明实施例提供的对视频压缩数据进行频 域交织和时域交织后进行误码掩盖的实例;
图 7为本发明实施例提供的在 OFDM信道传输视频压缩数据并 进行误码掩盖的系统组成图;
图 8为本发明实施例提供的发送端的结构示意图;
图 9 为本发明实施例提供的发送端的频域交织模块的结构示意 图一;
图 10为本发明实施例提供的发送端的频域交织模块的结构示意 图二;
图 11为本发明实施例提供的接收端的结构示意图。 具体实施方式
下面结合附图及具体实施例对本发明实施例再作进一步详细的 说明。
本发明实施例的核心思想是:发送端将输入的视频压缩数据分割 为片 (Slice )结构, 然后将相邻的 Slice结构分配到不相邻的 OFDM
子信道或子信道组上发送给接收端, 接收端对收到的各 OFDM子信 道或子信道组上的 Slice结构进行重新排序, 并进行误码检测, 当检 测到有 Slice结构发生误码时,则才艮据在时间或空间上与该 Slice结构 相关的 Slice结构, 对该 Slice结构进行误码掩盖。
本发明实施例中,将相邻的 Slice结构分配到不相邻的 OFDM子 信道或子信道组的方法, 称为频域交织法。
进一步地, 本发明实施例中, 可每隔一段时间间隔更改一次将 Slice结构分配到 OFDM子信道或子信道组上的分配规则, 即: 在不 同时刻采用不同的频域交织方法, 将该方法称为时域交织法。
图 2为本发明实施例提供的在 OFDM信道上传输视频压缩数据 时进行误码掩盖的流程图, 如图 2所示, 其具体步骤如下:
步骤 201: 接收视频压缩数据。
步骤 202: 将接收到的视频压缩数据分割为 Slice结构。
在现有的视频压缩标准中都定义了 Slice结构的分割方法, 本步 骤中, 可根据采用的视频压缩标准, 进行视频压缩数据的 Slice结构 分割。
步骤 203: 判断当前是否满足 Slice分配规则更新条件, 若是, 执行步骤 204; 否则, 执行步骤 205。
步骤 204: 根据预先设定的 Slice分配规则, 采用与前一视频帧 不同的 Slice分配规则, 将相邻的 Slice结构分配到不相邻的 OFDM 子信道或子信道组上, 转至步骤 206。
步骤 205: 采用与前一视频帧相同的 Slice分配规则, 将相邻的 Slice结构分配到不相邻的 OFDM子信道或子信道组上。
―通常, OFDM子信道的总敎 M 大于 Slice 结构的总数 N, 设 K
即: κ等于 M与 N相除后向下取整后的值, 则 K为每 个 OFDM子信道组中包含的 OFDM子信道数目,每个 OFDM子信道 组对应一个 Slice结构; 若 P=M%N, 且 P不为 0, 则在剩余的 P个 OFDM子信道上传输控制数据例如: 频域交织及时 i或交织控制数据 等, 若 P=0, 则将控制数据与某个 Slice结构一起分配到某个 OFDM
子信道上。
步骤 206: 对分配给每一个 OFDM子信道或子信道组的 Slice结 构进行信道编码、 空间域交织、 QAM映射、
步骤 207: 在设定的 OFDM子信道上插入导频信号, 将 Slice结 构经 QAM映射后得到的数据与插入的导频信号一起经过 IFFT和插 入保护间隔处理后得到 OFDM信号,将该 OFDM信号发送给接收端。
本步驟中采用的空间域交织方法与现有技术中的空间域交织方 法相同。
步骤 208:接收端收到 OFDM信号后,进行移除保护间隔、 FFT、 根据插入导频信号进行信道修正、 信道解码后, 得到各 OFDM子信 道或子信道组上的原始 Slice结构。
步驟 209: 接收端对由 Slice结构构成的视频压缩数据进行解压 缩处理并进行检测, 检测到有 Slice结构发生误码, 则根据在时间或 空间上与该 Slice结构相关的、 成功接收的 Slice结构, 对该 Slice结 构进行误码掩盖。
具体地,在时间上与发生误码的 Slice结构相关的 Slice结构指的 是, 位于发生误码的 Slice结构所在视频帧的参考视频帧中、 且与发 生误码的 Slice结构位置相关的 Slice结构。参考视频帧可以是当前视 频帧的前一帧或前两桢等,参考视频帧信息通过压缩码流发送给解码 端; Slice结构是由宏块构成的, 每个宏块中都包含运动矢量信息, 该运动矢量信息指示了该宏块在当前视频帧中相对于在参考视频帧 中移动的距离, 因此, 根据每个宏块中的运动矢量信息, 可以在参考 视频帧中查找到与该宏块位置最相近即: 最相关的宏块。 从而, 在 Slice 结构的某个宏 发生误码时, 可根据该宏块中运^ ^:量信息, 在参考视频帧中查找到与该宏块最相关的宏块,从而可根据该宏块对 发生误码的宏块进行误码掩盖。
在空间上与发生误码的 Slice结构相关的 Slice结构指的是,与发 生误码的 Slice结构位于同一视频帧中、且与发生误码的 Slice结构相 邻的 Slice结构。 当 Slice结构中的某个宏块发生误码时, 在进行误码
掩盖时, 可采用位于该 Slice结构的前一 Slice结构或后一 Slice结构 中、 与发生误码的宏块位于 Slice结构的同一位置或相邻位置的宏块 对发生误码的宏块进行误码掩盖。
视频压缩数据在 OFDM信道上传输时, 分为面向流的应用和面 ^分组的应用。 对于前一种应用, 接收端必须得知发送端在将 Slice 结构分配到 OFDM子信道或子信道组上时所采用的 Slice分配规则, 以便对接收到的 OFDM子信道或子信道组上的 Slice结构进行重新排 序, 恢复出原始视频压缩数据; 而对于后一种应用, 由于视频压缩数 据是以分组的形式传输的, 每个 Slice结构包含若干个分组, 每个分 组具有一个分组编号, 该分组编号会同分组数据一 送到接收端 , 因此,接收端无需得知发送端将 Slice结构分配到 OFDM子信道或子 信道组上时所采用的 Slice分配规则,只需根据 Slice结构中各分组的 分组编号对 Slice结构进行重新排序, 就可得到原始视频压缩数据。 以下分别给出视频压缩 :据面向流应用和面向分组应用时,本发明实 施例提供的误码掩盖方法。
图 3 为本发明实施例一提供的视频压缩数据面向流应用时, 在 OFDM信道上传输并进行误码掩盖的流程图,如图 3所示,其具体步 躁如下:
步骤 301: 发送端接收视频压缩数据流。
步驟 302: 发送端将收到的视频压缩数据分割为 Slice结构。 步骤 303: 发送端判断当前是否满足 Slice分配规则更新条件, 若是, 执行步骤 304; 否则, 执行步骤 305。
步骤 304: 根据预先设定的 Slice分配规则, 采用与前一视频帧 不„同的— Slice分配规则, -将相邻的 Slice结构分配 不相邻的 OFDM 子信道或子信道组上, 同时将当前更新的 Slice分配规则信息分配到 预先设定的 OFDM子信道中, 转至步驟 306。
每一个 OFDM子信道或子信道组对应一个緩冲区, 发送端将 Slice结构分配到与 OFDM子信道或子信道组对应的緩冲区中。
Slice分配规则可每隔预定数目的帧更新一次, 发送端检测到当
前已接收到的视频帧的数目等于预定 Slice分配规则更新视频帧数 目, 则更新 Slice分配规则; 或者, 每隔预定时长更新一次, 发送端 检测到当前时刻到达预定更新时刻, 则更新 Slice分配规则; 或者, 根据接收端发来的更新指示更新, 通常, 接收端在对 OFDM子信道 进行信道特征估计时, 若检测到 OFDM子信道的信道质量变差如: 低于预定的信道质量, 则会向发送端发送 Slice分配规则更新指示; 或者, 在对 OFDM子信道或子信道组上的数据进行信道解码, 若检 测到有数据产生误码,且误码数目或无法糾正的误码数目达到预设阈 值, 则向发送端发送 Slice分配规则更新指示; 或者, 在对以 Slice结 构构成的视频压缩数据进行解压缩处理时, 若检测到有 Slice结构发 生误码, 且误码的数目到达预设阈值, 则向发送端发送 Slilce分配规 则更新指示。
当前更新的 Slice分配规则信息具体分到哪个 OFDM子信道中, 可由发送端和接收端预先协商确定,或者由网络管理员预先配置到发 送端和接收端上。通常将 Slice分配规则信息分配到未被 Slice结构占 用的空闲 OFDM子信道中, 例如: 预先设定不被 Slice结构占用的第 一个空闲 OFDM子信道用于存储当前更新的 Slice分配规则信息。则, 假设 OFDM子信道共有 22个,其序号分别为 0〜21 ,其中序号为 0~19 的子信道已被分配给 Slice结构,则可将序号为 20的子信道用于传输 当前采用的 Slice分配规则信息,序号为 21的子信道则用于传输其它 控制信息等。 若 OFDM子信道都被 Slice结构占用, 则将该 Slice分 配规则信息与某个 Slice结构一起分配到某个 OFDM子信道中。
步骤 305: 采用与前一视频帧相同的 Slice分配规则, 将相邻的 Slice结构分配到不相邻的 OFDM子信道或子信道组上。
步骤 306: 对分配给每一个 OFDM子信道或子信道组的 Slice结 构依次进行信道编码、 空间域交织、 QAM映射
步骤 307: 在设定的 OFDM子信道上插入导频信号, 将 Slice结 构经 QAM映射后得到的数据与插入的导频信号一起经过 IFFT和插 入保护间隔处理后得到 OFDM信号,将该 OFDM信号发送到接收端。
步骤 308: 接收端收到 OFDM信号后, 依次进行移除保护间隔、 FFT、 根据插入导频信号进行信道特征估计及修正、 信道解码后在各 OFDM子信道或子信道组上得到原始 Slice结构。
步骤 309:接收端判断预先设定的 OFDM子信道上是否存在更新 的 Slice分配规则信息, 若是, 执行步骤 310; 否则, 执行步骤 311。
步骤 310: 接收端以该 Slice分配规则信息更新自身当前保存的 Slice分配规则信息, 并根据更新后的 Slice分配规则信息对各 OFDM 子信道或子信道组上的 Slice结构进行排序, 转至步骤 312。
步驟 311: 接收端根据自身当前保存的 Slice分配规则信息, 对 各 OFDM子信道或子信道组上的 Slice结构进行 序。
步骤 312: 接收端对由 Slice结构构成的视频压缩数据进行解压 缩处理, 判断是否有 Slice结构发生误码, 若是, 执行步骤 313; 否 则, 不作处理, 本流程结束。
步骤 313: 接收端判断相邻视频帧中与发生误码的 Slice结构位 于同一位置的 Slice结构是否被成功接收, 若是, 执行步骤 314; 否 则, 执行步驟 315。
步骤 314: 接收端根据相邻视频帧中同一位置的 Slice结构, 对 各发生误码的 Slice结构进行误码掩盖, 本流程结束。
相邻视频帧可以是当前视频帧的前一帧或当前视频帧的后一帧 等。
步驟 315:接收端根据当前视频帧成功接收的与发生误码的 Slice 结构相邻 Slice结构, 对各发生误码的 Slice结构进行误码掩盖。
相邻 Slice结构可以是同一视频帧中当前 Slice结构的前一 Slice 结构或后一 Slice结构等。
需要指出的是, 在本实施例中, 当预先设定的 OFDM子信道上 分配有 Slice分配规则信息时,该 Slice分配规则信息也可以不参与信 道编码、 空间域交织、 QAM映射等处理, 而直接与其它 OFDM子信 道上的 Slice结构一同进行 IFFT和插入保护间隔处理;相应地, 在接 收端只对该预先设定的 OFDM子信道上的数据进行移除保护间隔和
IFFT处理后就可得到原始的 Slice分配规则信息, 而不需再进行信道 特征估计及修正、 QAM逆映射、 空间域解交织、 信道解码处理。
在实际应用中, 发送端和接收端也可在传输视频压缩数据流前, 预先协商好所采用的 Slice分配规则, 以及分配规则更新条件; 或者, 也可由网络管理员等将 Slice分配规则, 以及分配规则更新条件预先 配置在发送端和接收端上。
图 4 为本发明实施例二提供的视频压缩数据面向分组应用时进 行误码掩盖的流程图, 如图 4所示, 其具体步骤如下:
步骤 401: 发送端接收视频压缩分组数据。
步骤 402: 发送端将收到的视频压缩分组数据分割为 Slice结构。 步骤 403: 发送端判断当前是否满足 Slice分配规则更新条件, 若是, 执行步骤 404; 否则, 执行步骤 405。
步骤 404: 发送端根据预先设定的 Slice分配规则, 采用与前一 视频帧不同的 Slice分配规则, 将相邻的 Slice结构分配到不相邻的 OFDM子信道或子信道组中, 转至步骤 406。
步骤 405: 发送端采用与前一视频帧相同的 Slice分配规则, 将 相邻的 Slice结构分配到不相邻的 OFDM子信道或子信道组中。
步骤 406: 发送端对分配给每一个 OFDM子信道或子信道组的 Slice结构依次进行信道编码、 空间域交织、 QAM映射。
步骤 407: 在设定的 OFDM子信道上插入导频信号, 将 Slice结 构经 QAM映射后得到的数据与插入的导频信号一起经过 IFFT和插 入保护间隔处理后得到完整的 OFDM信号 , 将该 OFDM信号发送到 接收端。
步骤 408: 接收端收到 OFDM信号^ , 依次进行移除保护间隔、 FFT、 ^艮据插入导频信号进行信道特征估计及修正、 信道解码处理后 在各 OFDM信道上得到原始 Slice结构。
步骤 409: 接收端根据 Slice结构中各分组数据的分组编号, 对 Slice结构进行排序。
步骤 410: 接收端对由 Slice结构构成的视频压缩数据进行解压
缩处理, 判断是否有 Slice结构发生误码, 若是, 执行步骤 411; 否 则, 不作处理, 本流程结束。
步骤 411: 接收端判断相邻视频帧中与发生误码的 Slice结构位 于同一位置的 Slice结构是否被成功接收, 若是, 执行步骤 412; 否 则, 执行步骤 413。
步驟 412: 接收端才艮据相邻视频帧中同一位置的 Slice结构, 对 各发生误码的 Slice结构进行误码掩盖, 本流程结束。
步骤 413:接收端根据当前视频帧成功接收的与发生误码的 Slice 结构相邻 Slice结构, 对各发生误码的 Slice结构进行误码掩盖。
以下给出一个应用频域交织法进行误码掩盖的具体实例。
图 5-1为对视频压缩数据的 Slice结构的分割示意图;图 5-2为不 对视频压缩数据进行频域交织时,各 Slice结构在各 OFDM子信道上 的分配示意图; 图 5-3 为对视频压缩数据进行频域交织时, 各 Slice 结构在各 OFDM子信道上的分配示意图。 假设 OFDM子信道 4和 5 发生了介于时刻 2〜7之间的突发误码,则在不对视频压缩数据进行频 域交织时, Slicel〜4可能同时受到误码影响, 由于 Slicel〜4为相邻区 域, 因此, 会造成较大区域内的视频压缩数据无法进行有效的误码掩 盖, 从而无法恢复出正确的视频压缩数据。 而当对视频压缩数据进行 了频域交织后, 由于一个 Slice结构只在一个 OFDM子信道上传输, 因此子信道 4和 5的误码只会影响到 Slice3和 Slice6, 这样就很容易 利用 Slice2、 Slice4对 Slice3进行误码掩盖, 利用 Slice5、 Slice7对 Slice6进行误码掩盖, 使得误码数据能够得到有效恢复。
以下给出一个应用频域交织和时域交织法进行误码掩盖的具体 实例。
图 6-1为对视频压缩数据的 Slice结构的分割示意图;图 6-2为在 t0时刻采用一种频域交织法后,各 Slice结构在各 OFDM子信道上的 分配示意图; 图 6-3为 tl时刻采用另一种频域交织法后, 各 Slice结 构在各 OFDM子信道上的分配示意图。假设在 t0时刻 OFDM子信道 7〜9发生了突发误码, 则 Slice4、 13、 5会受到误码影响。 而在 tl时
刻, 若 OFDM子信道 7〜9的突发误码现象仍然存在, 则此时 Slicel、 10、 2会受到影响, 可以看到: 采用时域交织后, 在不同时刻, 突发 误码影响的 Slice结构的位置不同, 这样就不会产生由于总是相同位 置的 Slice结构产生误码,而导致同一位置的 Slice结构总是无法成功 接收, 从而影响视频压缩数据的有效恢复的情况的发生。
本发明实施例中的频域交织法只要保证相邻 Slice结枸分配到不 相邻的 OFDM子信道或子信道组上即可, 以下给出三种本发明实施 例应用的频 i或交织法。
一、 二次奇偶交错法
设输入的 Slice结构的序号为 χ' , 映射到的 OFDM子信道或子信 道组的序号为 ζ', 为中间变量, z' = G,l,„',N_l, N为 Slice结构的总 数, 则有以下公式:
需要说明的是, 在以下公式中出现的 ^上 ^为有理数,表示对 ^ 进行向下取整。
N为偶数时,
y> 0,1
(2)
Zi = +[_(Μ) / 2_j*2+(I-(i-I)%2) Ζ· = 1,2, ... , N— 2 (3)
ZN-\ = ^JV-l (4)
N为奇数时,
^N-l = XN-l (6)
(7)
Zi ~ Ί+[('-1) / 2_|*2+(l-(/-l)%2), i=\,2,...,N— \ (8) 根据以上公式, 分别给出当 Slice结构的总数 N为偶数 10和奇 数 9时, Slice结构的序号 ^与 OFDM子信道或子信道組的序号 z '的 映射关系:
表一为 N=10时, 采用二次奇偶交错法时, Slice结构的序号 ^与 OFDM子信道或子信道组的序号 的映射关系:
xi
0 1 1
1 0 3
2 3 0
3 2 5
4 5 2
5 4 7
6 7 4
7 6 9
8 9 6
9 8 8
表一 N=10 时, 采用二次奇偶交错法, Slice结构的序号 χ'与 OFDM子信道或子信道组的序号 的映射关系
表二为 N=9 时, 采用二次奇偶交错法, Slice 结构的序号 χ'与 OFDM子信道或子信道组的序号 ζ''的映射关系:
表二 N=9时,采用二次奇偶交错法, Slice结构的序号 χ'与 OFDM 子信道或子信道组的序号 ^的映射关系
二、 二分交错法 A
设输入的 Slice结构的序号为 χ', 映射到的 OFDM子信道或子信 道組的序号为 z', S = LN/2J, 则有以下公式:
N为偶数时,
zi = "2]+。 , i = ,l,...,N-l ( 9 ) 其中, 当 ί%2 = 0时, = 0 ; 当 ί%2 = 1时, a = S。
N为奇数时,
=½一1 ( 10 )
zi - , i = \,2,...,N -\ ( 11 )
其中, 当(ζ·— 1)%2 = 0时, b = 0 . 当(一1)%2 = 1时, b = s。
根据以上公式, 分別给出当 Slice结构的总数 N为偶数 10和奇 数 9时, Slice结构的序号 χ''与 OFDM子信道或子信道组的序号 z '的 映射关系:
表三为 N=10时,采用二分交错法 A, Slice结构的序号 χ'与 OFDM 子信道或子信道组的序号 ζ'的映射关系:
表三 N=10时,采用二分交错法 A, Slice结构的序号 χ'与 OFDM 子信道或子信道组的序号 z '的映射关系
表四为 N=9 时, 采用二分交错法 A 时, Slice结构的序号 x,与
OFDM子信道或子信道组的序号 的映射关系:
表四 N=9时,采用二分交错法 A时 , Slice结构的序号 ^与 OFDM 子信道或子信道组的序号 zi的映射关系
三、 二分交错法 B
设输入的 Slice结构的序号为 ^ , 映射到的 OFDM子信道或子信 道组的序号为 Z S=N/2, 则有以下公式:
N为偶数时,
zi = , z' = 0,l,...,N-l ( i2 )
其中, 当 %2 = 0时, a = 0; 当 %2 = 1时, a = S。
N为奇数时,
ζο =½-ι (13)
zi = xL(/-i) 2 i , i = 1,2..,N— 1 ( i4 )
其中, 当(z'_l)%2 = 0时, ¾ = 0; 当(一 1)%2 = 1时, b = S。
― 根据以上公式, 分别给出当 Slice结构的总数 N—为偶数 10和奇 数 9时, Slice结构的序号 与 OFDM子信道或子信道组的序号 z '的 映射关系:
表五为 N=10时,采用二分交错法 B , Slice结构的序号 χ'与 OFDM 子信道或子信道组的序号 ζ'的映射关系:
xi
0 5
1 0
2 6
3 1
4 7
5 2
6 8
7 3
8 9
9 4
表五 N=10时,采用二分交错法 B , Slice结构的序号 与 OFDM 子信道或子信道组的序号 的映射关系
表六为 N=9时, 采用二分交错法 B , Slice结构的序号 χ'与 OFDM子信道或子信道组的序号 的映射关系:
表六 N=9时, 釆用二分交错法 B, Slice结构的序号 χ'与 OFDM 子信道或子信道组的序号2 i的映射关系
本发明实施例中的时域交织法的目的是使位于相邻视频帧的同
一位置上的 Slice结构映射到不同的 OFDM子信道或子信道组上, 以 便在某些 OFDM子信道或子信道组出现长时间衰落而造成 Slice结构 发生误码时, 可以利用相邻视频帧同一位置的 Slice结构进行误码掩 盖。 以下给出本发明实施例应用的两种时域交织方法:
一、 交织切换法
该方法可时间间隔或视频帧为单位,每隔预定时间间隔或每隔预 定数目的视频帧重复采用相同的频域交织方法,而在相邻的预定时间 间隔内或相邻的预定数目的视频帧内采用不同的频域交织方法。
例如: 设视频帧的序号为 M, 当 M为偶数时, 频 i或交织法采用 二次奇偶交错法; 当 M为奇数时, 频域交织法采用二分交错法 A。 以下给出当 Slice结构的总数 N=10和 N=9时, 对于奇数视频帧和偶 数视频帧, Slice结构的序号 χ'与 OFDM子信道或子信道组的序号 ζ'的 不同映射关系:
表七 当 Slice结构的总数 N=10时, 采用交织切换, 对于奇数视 频帧和偶数视频帧, Slice结构的序号 与 OFDM子信道或子信道组
的序号 的不同映射关系
表八 当 Slice结构的总数 N=9时, 采用交织切换, 对于奇数视 频帧和偶数视频帧, Slice结构的序号 ^与 OFDM子信道或子信道組 的序号 的不同映射关系
二、 交织级联切换
该方法的原理如下:每隔预定时间间隔或每隔预定数目的视频帧 重复采用相同的频域交织方法,在相邻的预定时间间隔或预定数目视 频帧内采用不同的频域交织法,且在其中至少一个预定时间间隔或预 定数目视频帧内进行两次相同或不同的频域交织运算。
例如: 设视频帧的序号为 M, 当 M为偶数时, 频 i或交织方法采 用二分交错法 A; 当 M为奇数时, 先采用一次二分交错法 , 对得 —到的结果再采用一次二分交错—法 以下给出当 .„ Slice 结构的总数 N=10和 N=9时, 对于奇数视频帧和偶数视频帧, Slice结构的序号 Xi 与 OFDM子信道或子信道组的序号 的不同映射关系:
Slice 结构 偶数视频帧对 奇数视频帧对应 序号 χ' 应的 OFDM子信道 的 OFDM子信道或子 或子信道组序号 信道组序号2 i
0 1 3
1 3 5
2 0 1
3 5 7
4 2 0
5 7 9
6 4 2
7 9 8
8 6 4
9 8 6
表九 当 Slice结构的总数 N=10时, 采用交织级联切换, 对于奇 数视频帧和偶数视频帧, Slice结构的序号 χ'与 OFDM子信道或子信 道组的序号 ζ'·的不同映射关系
表十 当 Slice结构的总数 N=9时, 采用交织级联切换, 对于奇
数视频帧和偶数视频帧, Slice结构的序号 χ'与 OFDM子信道或子信 道组的序号 的不同映射关系
图 7为本发明实施例提供的在 OFDM信道上传输视频压缩数据 并进行误码掩盖的系统组成图, 如图 7 所示, 其主要包括: 发送端 71和接收端 72, 其中:
发送端 71: 用于在收到外部输入的视频压缩数据后, 将该视频 压缩数据分割成 Slice 结构, 将相邻的 Slice 结构分配到不相邻的 OFDM子信道或子信道组上, 将各 Slice结构发送到接收端 72。
接收端 72:用于读取发送端 71发来的各 OFDM子信道或子信道 组上的 Slice结构, 检测到有 Slice结构发生误码, 则根据在时间或空 间上与该 Slice结构相关的、 成功接收的 Slice结构, 对该 Slice结构 进行误码掩盖。
图 8为本发明实施例提供的发送端的结构示意图, 如图 8所示, 发送端 71主要包括: Slice分割模块 711、 时域交织控制模块 712、 频域交织模块 713、 信道编码模块 714、 空间域交织模块 715、 QAM 映射模块 716、 插入导频模块 717、 IFFT模块 718和插入保护间隔模 块 719, 其中:
Slice分割模块 711:用于将外部输入的视频压缩数据分割成 Slice 结构 , 将各 Slice结构发送给频域交织模块 713。
时域交织控制模块 712: 用于保存 Slice分配规则更新条件, 当 检测满足该更新条件时, 向频域交织模块 713发送更新指示。
频域交织模块 713: 用于保存 Slice分配规则信息, 当收到 Slice 分割模块 711发来的 Slice结构, 且未收到时域交织控制模块 712发 来的更新指示时, 采用与前一视频帧相同的 Slice分配规则, 将收到 的当前视频帧的相邻 Slice结构分配给不相邻的 OFDM子信道或子信 道组, 将各 Slice结构发送给信道编码模块 714; 当收到 Slice分割模 块 711发来的 Slice结构, 且收到时域交织控制模块 712发来的更新 指示时, 采用与前一视频帧不同的 Slice分配规则, 将收到的当前视 频帧的相邻 Slice结构分配给不相邻的 OFDM子信道或子信道组,将
各 Slice结构发送给信道编码模块 714。
信道编码模块 714:用于对频域交织模块 713发来的各 OFDM子 信道或子信道组上的数据进行编码,将编码得到的数据发送给空间域 交织模块 715。
空间域交织模块 715: 用于对信道编码模块 714发来的各 OFDM 子信道或子信道组上的数据进行空间域交织, 将得到的数据发送给 QAM映射模块 716。
QAM映射模块 716:用于对空间域交织模块 715发来的各 OFDM 子信道或子信道组上的数据进行 QAM映射, 将得到的数据发送给插 入导频模块 717。
插入导频模块 717:用于接收 QAM映射模块 716发来的各 OFDM 子信道或子信道组上的数据, 将导频数据插入到 OFDM子信道上, 将各 OFDM子信道或子信道上的数据发送给 IFFT模块 718。
IFFT模块 718: 用于对插入导频模块 717发来的各 OFDM子信 道或子信道组上的数据进行 IFFT, 将得到的数据发送给插入保护间 隔模块 719。
插入保护间隔模块 719: 用于对 IFFT模块 718发来的各 OFDM 子信道或子信道组上的数据插入保护间隔,将得到的数据发送到接收 端。
图 9为本发明实施例提供的频域交织模块的结构示意图一,如图 9所示, 其主要包括: 分配规则更新确定模块 901、 片结构分配模块 902和片分配规则信息分配模块 903 , 其中:
分配规则更新确定模块 901: 用于在收到时域交织控制模块 712 发来的更新指示时, 向片结构分配模块 902发送分配规则更新指示。
片结构分配模块 902:用于保存 Slice分配规则信息,当收到 Slice 分割模块 711发来的 Slice结构,且未收到分配规则更新确定模块 901 发来的分配规则更新指示时, 釆用与前一视频帧相同的 Slice分配规 则,将收到的当前视频帧的相邻 Slice结构分配给不相邻的 OFDM子 信道或子信道组, 将各 Slice结构发送 言道编码模块 714; 当收到
Slice分割模块 711发来的 Slice结构, 且收到分配规则更新确定模块 901发来的分配规则更新指示时, 釆用与前一视频帧不同的 Slice分 配规则, 将收到的当前视频帧的相邻 Slice 结构分配给不相邻的 OFDM子信道或子信道组,将各 Slice结构发送给信道编码模块 714, 并将当前采用的片分配规则信息发送给片分配规则信息分配模块 903。
片分配规则信息分配模块 903: 用于将片结构分配模块 902发来 的片分配规则信息分配到 OFDM子信道上, 将该 OFDM子信道上的 数据到信道编码模块 714。
图 10为本发明实施例提供的频域交织模块的结构示意图二, 如 图 10所示, 其主要包括: 分配规则更新确定模块 1001、 片结构分配 模块 1002和片分配规则信息分配模块 1003, 其中:
分配规则更新确定模块 1001与分配规则更新确定模块 901完全 相同, 片结构分配模块 1002与片结构分配模块 902完全相同, 片分 配规则信息分配模块 1003与片分配规则信息分配模块 903的不同之 处在于: 片分配规则信息分配模块 1003将片结构分配模块 1002发来 的片分配规则信息分配到 OFDM子信道上后 , 将该 OFDM子信道上 的数据发送到 IFFT模块 718。
图 11为本发明实施例提供的接收端的结构示意图,如图 11所示, 接收端 72主要包括: 移除保护间隔模块 721、 FFT模块 722、信道修 正模块 723、 QAM逆映射模块 724、 空间域解交织模块 725、 信道解 码模块 726、 频域解交织模块 727、 解压缩及误码检测模块 728和误 码掩盖模块 729, 其中:
- …移除保护间隔模块 721: 用于移除发送端 71发来的各 OFDM子 信道或子信道组上的数据上的保护间隔, 将得到的数据发送到 FFT 模块 722。
FFT模块 722:用于对移除保护间隔模块 721发来的各 OFDM子 信道或子信道组上的数据进行 FFT,将得到的数据发送给信道估计修 正模块 723。
信道估计修正模块 723: 用于根据 FFT模块 722发来的 OFDM 子信道上的导频数据进行信道特征估计, 根据估计结果对各 OFDM 子信道或子信道上的视频压缩数据进行修正, 将得到的数据发送给 QAM逆映射模块 724。
QAM逆映射模块 724: 用于对信道估计修正模块 723发来的各 OFDM子信道或子信道组上的数据进行 QAM逆映射,将得到的数据 发送给空间域解交织模块 725。
空间域解交织模块 725: 用于对 QAM逆映射模块 724发来的各 OFDM子信道或子信道组上的数据进行空间域解交织,将得到的数据 发送给信道解码模块 726。
信道解码模块 726: 用于对空间域解交织模块 725 发来的各 OFDM子信道或子信道组上的数据进行解码,将得到的数据输出到频 域解交织模块 727。
频域解交织模块 727: 用于读取信道解码模块 726 发来的各 OFDM子信道或子信道组上的 Slice结构 ,并对各 Slice结构进行排序 , 将排序得到的 Slice结构发送给解压缩及误码检测模块 728。
解压缩及误码检测模块 728: 用于对频域解交织模块 727发来的 以 Slice结构构成的视频压缩数据进行解压缩处理,检测到有 Slice结 构发生误码时, 将该 Slice结构的相关信息包括: 该 Slice结构所在视 频帧的帧标识、 该 Slice结构在所在视频帧中的位置信息等发送给误 码掩盖模块 729。
误码掩盖模块 729: 接收到解压缩及误码检测模块 728发来的 Slice结构信息,根据该 Slice结构信息,利用该 Slice结构所在视频 帧 的相邻视频†贞成 收的、 与该 Slice结构位置相关的 Slice结构, 和 /或该 Slice结构所在视频帧中成功接收的、 且与该 Slice结构相邻的 Slice结构, 对该 Slice结构进行误码掩盖。
进一步地, 接收端 72 包括: 时域解交织控制模块 730: 用于将 自身配置的 Slice分配规则信息, 或者从信道解码模块 726或 FFT模 块 722发来的在预先设定的 OFDM子信道上的更新的 Slice分配规则
信息发送给频域解交织模块 727, 此后频域解交织模块 727根据该 Slice分配规则信息, 对各 Slice结构进行排序。
通过以上的实施方式的描述,本领域的技术人员可以清楚地了解 到本发明可借助软件加必需的通用硬件平台的方式来实现,当然也可 以通过硬件,但很多情况下前者是更佳的实施方式。基于这样的理解, 本发明的技术方案本质上或者说对现有技术做出贡献的部分可以以 软件产品的形式体现出来, 该计算机软件产品存储在一个存储介质 中, 包括若干指令用以使得一台计算机设备(可以是个人计算机, 服 务器, 或者网络设备等)执行本发明各个实施例所述的方法。 以上公 开的仅为本发明的几个具体实施例, 但是, 本发明并非局限于此, 任 何本领域的技术人员能思之的变化都应落入本发明的保护范围。
以上所述仅为本发明实施例的过程及方法实施例,并不用以限制 本发明实施例, 凡在本发明实施例的精神和原则之内所做的任何修 改、 等同替换、 改进等, 均应包含在本发明实施例的保护范围之内。
Claims
1、 一种误码掩盖方法, 其特征在于, 包括:
发送端接收视频压缩数据, 将该视频压缩数据分割成片结构; 分配相邻片结构到不相邻的正交频分复用子信道或子信道组上, 并将所述片结构发送到接收端;
接收端从所述 OFDM子信道或子信道组上读取所述片结构, 并 对所述片结构进行检测;
检测到有片结构发生误码,则根据在时间或空间上与该片结构相 关的片结构, 对该发生误码的片结构进行误玛掩盖。
2、 如权利要求 1所述的方法, 其特征在于, 所述将该视频压缩 数据分割成片结构之后,分配相邻片结构到不相邻的正交频分复用子 信道或子信道组上之前包括:
判断是否满足片分配规则更新条件, 若是, 则采用与前一视频帧 不同的分配规则 ,将当前视频帧的相邻片结构分配到不相邻的 OFDM 子信道或子信道组上; 否则, 采用与前一视频帧相同的分配规则, 将 当前视频帧的相邻片结构分配到不相邻的 OFDM子信道或子信道组 上。
3、 如权利要求 1所述的方法, 其特征在于, 所述分配相邻片结 构到不相邻的 OFDM子信道或子信道组上的方法包括: 二次奇偶交 错法、 二分交错法 A、 二分交错法 B中的一种或任意组合实现。
4、 如权利要求 1所述的方法, 其特征在于, 所述发送端判断是 否满足片分配规则更新奈件包括:判断当前时刻是否到达预定片分配 规则更新时刻; ^
或者,当前已收到的视频帧的数目是否到达预定片分配规则更新 数目;
或者, 是否收到接收端发来的片分配规则更新指示。
5、 如权利要求 4所述的方法, 其特征在于, 所述发送端判断是 否满足片分配规则更新条件之前进一步包括: 接收端检测到 OFDM
子信道的信道质量估计值低于预先设定的信道质量值,则向发送端发 送片分配规则更新指示,发送端收到该指示后,确定满足片分配规则 更新条件;
或者, 接收端检测到 OFDM子信道上的片结构产生误码, 且误 码的数目或无法糾正的误码的数目达到预设阈值,则向发送端发送片 分配规则更新指示,发送端收到该指示后,确定满足片分配规则更新 条件;
或者, 接收端对 OFDM子信道上的片结构进行解压缩处理, 且 检测到有片结构产生误码, 且误码的数 ϋ达到预设阈值, 则向发送端 发送片分配规则更新指示,发送端收到该指示后, 确定满足片分配规 则更新条件。
6、 如权利要求 1所述的方法, 其特征在于, 所述方法进一步包 括: 将发送端采用的将片结构分配到 OFDM子信道或子信道组上的 片分配规则信息通知接收端;
所述接收端从各 OFDM子信道或子信道组上读取片结构之后、 检测到有片结构发生误码之前进一步包括:接收端根据所述片分配规 则信息, 对读取的各片结构进行排序。
7、 如权利要求 6所述的方法, 其特征在于, 所述将发送端采用 的片分配规则信息通知接收端包括:发送端将该片分配规则信息预先 通知合接收端;
或者, 将该片分配规则信息预先配置在接收端上;
或者, 发送端将该片分配规则信息分配到预先设定的 OFDM子 信道上, 通过该 OFDM子信道发送给接收端。
8 如权利要求 7所述的方法, 其特 fiE在于, 所述发送端将片分 配规则信息通过 OFDM子信道发送给接收端包括: 发送端对该片分 配规则信息与片结构一起进行信道编码、 空间域交织、 QAM映射处 理, 然后与插入的导频信号一起经过 IFFT和插入保护间隔处理后 , 发送到接收端。
9、 如权利要求 7所述的方法, 其特征在于, 所述发送端将片分
配规则信息通过 OFDM子信道发送给接收端包括: 发送端对该片分 配规则信息与片结构以及插入的导频信号一起经过 IFFT和插入保护 间隔处理后, 发送到接收端。
10、 如权利要求 1 所述的方法, 其特征在于, 所述接收端从各 OFDM子信道或子信道组上读取片结构之后、检测到有片结构发生误 码之前进一步包括: 接收端根据读取的各片结构中包含的分组编号, 对各片结构进行排序。
11、如权利要求 1所述的方法, 其特征在于, 所述将相邻的片结 构分配到不相邻的 OFDM子信道或子信道组上之后、 将各片结构发 送到接收端之前进一步包括:
发送端对各 OFDM子信道或子信道组上的片结构依次进行信道 编码、 空间 i或交织、 QAM映射、插入导频、反傅立叶变换 IFFT和插 入保护间隔处理。
12、 如权利要求 11所述的方法, 其特征在于, 所述发送端将各 片结构发送到接收端之后、 接收端从各 OFDM子信道或子信道组上 读取片结构之前进一步包括: 接收端对接收到的各 OFDM子信道或 子信道上的片结构进行移除保护间隔、 傅立叶变换 FFT、根据插入的 导频进行信道特征修正、 信道解码处理。
13、如权利要求 1所述的方法, 其特征在于, 所述在时间或空间 上与所述发生误码的片结构相关的片结构包括:位于所述发生误码的 片结构所在视频帧的相邻视频帧中、且所处位置与所述发生误码的片 结构所处位置相关的片结构;
或者, 与所述发生误码的片结构位于同一视频帧中, 且与所述发 生 码的片结构相邻的片结构。
14、 一种误码掩盖系统, 其特征在于, 包括: 发送端和接收端, 其中:
发送端, 用于在收到外部输入的视频压缩数据后, 将该视频压缩 数据分割成片结构, 将相邻的片结构分配到不相邻的 OFDM子信道 或子信道组上, 将各片结构发送到接收端;
接收端, 用于读取发送端发来的各 OFDM子信道或子信道组上 的片结构, 检测到有片结构发生误码, 则根据在时间或空间上与该片 结构相关的片结构, 对该片结构进行误马掩盖。
15、如权利要求 14所述的系统, 其特征在于, 所述发送端包括: 片分割模块和频域交织模块, 其中:
片分割模块, 用于将外部输入的视频压缩数据分割成片结构, 将 各片结构发送给频域交织模块;
频域交织模块,用于将收到的当前视频帧的相邻片结构分配给不 相邻的 OFDM子信道或子信道组, 将各片结构发送给接收端。
16、 如权利要求 15所述的系统, 其特征在于, 所述发送端进一 步包括: 时域交织控制模块, 用于保存片分配规则更新条件, 当检测 满足该更新条件时, 向频域交织模块发送更新指示;
所述频域交织模块包括:分配规则更新确定模块和片结构分配模 块, 其中:
分配规则更新确定模块,用于在收到时域交织控制模块发来的更 新指示时, 向片结构分配模块发送分配规则更新指示;
片结构分配模块, 用于接收当前视频帧的相邻片结构, 若未收到 分配规则更新指示, 则采用与前一视频帧相同的片分配规则,将当前 视频帧的相邻片结构分配给不相邻的 OFDM子信道或子信道组, 将 各片结构发送给接收端; 若收到分配规则更新指示, 则采用与前一视 频帧不同的片分配规则,将当前视频帧的相邻片结构分配给不相邻的 OFDM子信道或子信道组 , 将各片结构发送给接收端。
17、 如权利要求 14所述的系统, 其特征在于, 所述接收端包括: 频域解交织模块、 解压缩及误码检测模块、 误码掩盖模块, 其中: 频域解交织模块, 用于读取发送端发来的各 OFDM子信道或子 信道组上的片结构, 对各片结构进行排序, 将排序得到的片结构发送 给解压缩及误码检测模块;
解压缩及误码检测模块, 用于对收到的 Slice结构进行解压缩处 理, 在检测到片结构发生误码时, 将该片结构信息发送 吴码掩盖模
块;
误码掩盖模块, 收到片结构信息,根据在时间或空间上与该片结 构相关的片结构, 对该片结构进行误码掩盖。
18、 一种发送端, 其特征在于, 包括: 片分割模块和频域交织模 块, 其中:
片分割模块, 用于将外部输入的视频压缩数据分割成片结构, 将 各片结构发送给频域交织模块;
频域交织模块,用于将收到的当前视频帧的相邻片结构分配给不 相邻的 OFDM子信道或子信道组, 将各片结构发送给接收端。
19、 如权利要求 18所述的发送端, 其特狃在于, 进一步包括: 时域交织控制模块, 用于保存片分配规则更新条件, 当检测满足该更 新条件时, 向频域交织模块发送更新指示;
所述频域交织模块包括:分配规则更新确定模块和片结构分配模 块, 其中:
分配规则更新确定模块,用于在收到时域交织控制模块发来的更 新指示时, 向片结构分配模块发送分配规则更新指示;
片结构分配模块, 用于接收当前视频帧的相邻片结构, 若未收到 分配规则更新指示, 则采用与前一视频帧相同的片分配规则,将当前 视频帧的相邻片结构分配给不相邻的 OFDM子信道或子信道组, 将 各片结构发送给接收端; 若收到分配规则更新指示, 则采用与前一视 频帧不同的片分配规则,将当前视频帧的相邻片结构分配给不相邻的 OFDM子信道或子信道组, 将各片结构发送给接收端。
20、如权利要求 18或 19所述的发送端, 其特征在于, 进一步包 括: 信道编码模块、 空 域交织模块、 QAM映射模块、 插入导频模 块、 IFFT模块、 插入保护间隔模块, 其中:
信道編码模块, 用于对频域交织模块发来的各 OFDM子信道或 子信道组上的数据进行编码,将编码得到的数据发送给空间域交织模 块;
空间域交织模块, 用于对收到的各 OFDM子信道或子信道组上
的数据进.行空间域交织, 将得到的数据发送给 QAM映射模块;
QAM映射模块:用于对收到的各 OFDM子信道或子信道组上的 数据进行 QAM映射, 将得到的数据发送给插入导频模块;
插入导频模块, 用于将导频数据插入到 OFDM子信道上, 将各 OFDM子信道或子信道上的数据发送给 IFFT模块;
IFFT模块, 用于对收到的各 OFDM子信道或子信道组上的数据 进行 IFFT, 将得到的数据发送给插入保护间隔模块;
插入保护间陽模块, 用于对收到的各 OFDM子信道或子信道组 上的数据插入保护间隔, 将得到的数据发送到接收端。
21、 如权利要求 19所述的发送端, 其特征在于, 所述发送端进 一步包括: 信道编码模块, 用于对收到的数据进行信道编码后发往接 收端;
且, 所述片结构分配模块在收到分配规则更新指示后, 将当前采 用的片分配规则信息发送给所迷频域交织模块,
所述频域交织模块进一步包括: 片分配规则信息分配模块, 用于 将所述片结构分配模块发来的片分配规则信息分配到 OFDM子信道 上, 将该 OFDM子信道上的数据发送到所述信道编码模块。
22、 如权利要求 19所述的发送端, 其特征在于, 所述发送端进 一步包括: IFFT模块, 用于对收到的数据进行 IFFT后发往接收端; 且, 所述片结构分配模块在收到分配规则更新指示后, 将当前釆 用的片分配规则信息发送给所述频域交织模块,
所述频域交织模块进一步包括: 片分配规则信息分配模块, 用于 将所述片结构分配模块发来的片分配规则信息分配到 OFDM子信道 上, 将该 OFDM子信道上的数据发送到所述 IFFT模块。
23、 一种接收端, 其特征在于, 包括: 频域解交织模块、 解压缩 及误码检测模块、 误码掩盖模块, 其中:
频域解交织模块, 用于读取发送端发来的各 OFDM子信道或子 信道组上的片结构, 对各片结构进行排序, 将排序得到的片结构发送 给解压缩及误码检测模块;
解压缩及误码检测模块, 用于对收到的 Slice结构进行解压缩处 理, 在检测到片结构发生误码时, 将该片结构信息发送 吴码掩盖模 块;
误码掩盖模块, 收到解压缩及误码检测模块发来的片结构信息, 根据在时间或空间上与该片结构相关的片结构,对该片结构进行误码 掩盖。
24、 如权利要求 23所述的接收端, 其特征在于, 进一步包括: 移除保护间隔模块、 FFT模块、 信道估计修正模块、 QAM逆映射模 块、 空间域解交织模块、 信道解码模块, 其中:
移除保护间隔模块, 用于移除发送端发来的各 OFDM子信道或 子信道组上的数据上的保护间隔, 将得到的数据发送到 FFT模块;
FFT模块, 用于对收到的各 OFDM子信道或子信道组上的数据 进行 FFT, 将得到的数据发送给信道估计修正模块;
信道估计修正模块, 用于根据 OFDM子信道上的导频数据, 对 各 OEDM子信道或子信道组上的进行信道特征估计, 根据估计结果 对各 OFDM子信道或子信道组上的数据进行修正, 将得到的数据发 送给 QAM逆映射模块;
QAM逆映射模块,用于对收到的各 OFDM子信道或子信道组上 的数据进行 QAM逆映射, 将得到的数据发送给空间域解交织模块; 空间域解交织模块, 用于对收到的各 OFDM子信道或子信道组 上的数据进行空间域解交织, 将得到的数据发送给信道解码模块; 信道解码模块, 用于对收到的各 OFDM子信道或子信道组上的 数据进行解码 , 将得到的数据输出到频域解交织模块。
25、 如权利要求 24所述的接收端, 其特征在于, 进一步包括: 时域解交织控制模块, 用于将自身配置的片分配规则信息, 或者从信 道解码模块或 FFT模块发来的在预先设定的 OFDM子信道上的更新 的片分配规则信息发送给频域解交织模块。
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EP07845902A EP2093957A4 (en) | 2006-12-12 | 2007-12-12 | METHOD AND DEVICE FOR ERROR LEAKAGE |
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CN200610167247.8A CN100586193C (zh) | 2006-12-12 | 2006-12-12 | 误码掩盖方法和系统 |
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EP (1) | EP2093957A4 (zh) |
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CN101964913B (zh) * | 2010-08-27 | 2012-02-29 | 南京邮电大学 | 基于模糊分类的帧间误码掩盖方法 |
US9496982B2 (en) | 2011-03-04 | 2016-11-15 | Alcatel Lucent | System and method providing resilient data transmission via spectral fragments |
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WO2016108369A1 (ko) | 2014-12-31 | 2016-07-07 | 엘지전자 주식회사 | 방송 신호 송신 장치, 방송 신호 수신 장치, 방송 신호 송신 방법, 및 방송 신호 수신 방법 |
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EP2093957A4 (en) | 2011-11-23 |
CN101202922A (zh) | 2008-06-18 |
CN100586193C (zh) | 2010-01-27 |
US20090245392A1 (en) | 2009-10-01 |
EP2093957A1 (en) | 2009-08-26 |
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