HK1130977A - Transmission packet structure for transmitting uncompressed a/v data and transceiver using the same - Google Patents

Description

Transmission packet structure for transmitting uncompressed A/V data and transceiver using the same

Technical Field

Apparatuses and methods consistent with the present invention relate to wireless communication technology, and more particularly, to a data structure for transmitting a large amount of multimedia content.

Background

Due to the current trend toward wireless networks and the increased demand for transmission of large amounts of multimedia data, there is an increasing demand for research on more efficient transmission methods in wireless network environments. Furthermore, it is increasingly necessary to wirelessly transmit high-quality videos such as Digital Video Disc (DVD) videos and High Definition Television (HDTV) videos between various home devices.

Currently, one task group of IEEE 802.15.3c is working on establishing a technical standard for transmitting a large amount of data in a wireless home network. This standard is called millimeter wave (mmWave), which transmits a large amount of data using radio waves having a millimeter wavelength (i.e., radio waves having a frequency of 30GHz to 300 GHz). Up to now, this frequency band is an unauthorized frequency band, limited by communication providers, radio wave astronomy, vehicle collision avoidance, and the like.

Fig. 1 is a diagram comparing IEEE802.11 series standards with a frequency band of mmWave. IEEE802.11b or IEEE802.11 g uses a carrier frequency of 2.4GHz and has a channel bandwidth of about 20 MHz. Further, IEEE802.11 a or IEEE802.11 n uses a carrier frequency of 5GHz and has a channel bandwidth of about 20 MHz. However, mmWave uses a carrier frequency of 60GHz and has a channel bandwidth of about 0.5GHz to 2.5 GHz. Here, it should be noted that: mmWave has a carrier frequency higher than that of the existing IEEE802.11 series standard, and mmWave has a channel bandwidth wider than that of the existing IEEE802.11 series standard. By using a high-frequency signal (millimeter wave), a very high data rate of several Gbps can be obtained and the antenna size can be reduced to less than 1.5mm, so that a single chip including the antenna can be created. Further, since the attenuation rate in the air is very high, interference between devices can also be reduced.

Recently, studies have been made in order to be able to transmit uncompressed audio or video data (hereinafter, referred to as uncompressed AV data) between radio apparatuses by using a high bandwidth of millimeter waves. Compressed AV data is lossy-compressed through motion compensation, DCT conversion, quantization, variable length coding, and the like in such a manner that portions insensitive to human vision and hearing are removed. However, uncompressed AV data includes digital values (e.g., R, G and B components) representing pixel components.

Accordingly, bits included in compressed AV data do not have priority according to importance, and bits included in uncompressed AV data have priority. For example, as shown in fig. 2, in the case of an 8-bit image, one pixel component is represented by 8 bits. Among them, the bit representing the highest order (bit of the highest level) is the Most Significant Bit (MSB), and the bit representing the lowest order (bit of the lowest level) is the Least Significant Bit (LSB). That is, in restoring an image or sound signal, respective bits in one byte data having 8 bits have different importance levels. If the bit having higher importance makes an error during transmission, the occurrence of the error can be more easily detected than in the case where the error occurs in the bit having lower importance. Therefore, it is necessary to more strongly protect bit data having higher importance in a manner different from bit data having lower importance in order to prevent errors from occurring therein, however, as in the conventional transmission schemes of the IEEE802.11 series, an error correction scheme and a retransmission scheme having the same coding rate for all bits to be transmitted have been used.

Disclosure of Invention

Technical problem

Fig. 3 is a diagram illustrating the structure of a physical layer (PHY) protocol data unit (PPDU) of the IEEE802.11 a standard. The PPDU 30 includes a preamble, a signal field, and a data field. The signal field includes: a rate field for indicating a transmission rate; a length field indicating the length of the PPDU; as well as other information. Typically, the signal field is encoded in one symbol. The data field includes: PSDU, tail bits, and padding bits, data to be actually transmitted is included in the PSDU.

The conventional frame format as described above is effective in general data transmission. However, in order to transmit a large amount of data at several Gbps over an ultra-short distance of about 10m, new header structures and frame structures must be considered. In particular, as a main application field of a wireless transmission technology for transmitting data at several Gbps, in order to transmit uncompressed audio/video data (hereinafter, referred to as uncompressed AV data), it is necessary to design a header structure and a frame structure in consideration of an error correction and retransmission scheme based on the importance of data as described above.

Technical scheme

Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and an aspect of the present invention is to provide a method for constructing a transmission packet suitable for transmitting a large amount of uncompressed AV data through a bandwidth of several Gbps.

Another aspect of the present invention is to provide an apparatus for transmitting/receiving a transmission packet as described above.

Aspects of the present invention are not limited to the above. Those of ordinary skill in the art will recognize additional aspects of the invention in view of the following description of the invention.

According to an aspect of the present invention, there is provided a transport packet structure for transmitting uncompressed AV data, the transport packet structure comprising: a payload having a plurality of Transmission Data Units (TDUs) error-correction-encoded at a predetermined coding rate, wherein the payload is classified according to importance of bits constituting uncompressed AV data; a MAC header added to the payload, wherein information for medium access control is recorded in the MAC header; and a PHY header having information on the coding rate, wherein the PHY header is added to the MAC header.

According to another aspect of the present invention, there is provided a transmitter for transmitting uncompressed AV data, the transmitter comprising a unit generating a transport packet for transmitting the uncompressed AV data, and a unit transmitting the generated transport packet, wherein the transport packet comprises: a payload including a plurality of TDUs error correction coded at a predetermined coding rate, wherein the payload is classified according to importance of bits constituting uncompressed AV data; a MAC header added to the payload, wherein information for medium access control is recorded in the MAC header; and a PHY header having information on the coding rate, wherein the PHY header is added to the MAC header.

According to another aspect of the present invention, there is provided a receiver for receiving uncompressed AV data, the receiver including a unit for receiving a transmission packet having the uncompressed AV data, and a unit for restoring the AV data from the received transmission packet, wherein the transmission packet includes: a payload having a plurality of TDUs error correction coded at a predetermined coding rate, wherein the payload is classified according to importance of bits constituting uncompressed AV data; a MAC header added to the payload, wherein information for medium access control is recorded in the MAC header; and a PHY header having information on the coding rate, wherein the PHY header is added to the MAC header.

Drawings

The above and other aspects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:

fig. 1 is a diagram showing comparison of frequency bands between IEEE802.11 series standards and mmWave standards;

fig. 2 is a diagram showing one pixel component by using a plurality of bit levels;

fig. 3 is a diagram illustrating the structure of a PPDU of the IEEE802.11 a standard;

fig. 4 is a diagram illustrating a structure of a transport packet according to an exemplary embodiment of the present invention;

fig. 5 is a diagram illustrating a structure of a transport packet according to another exemplary embodiment of the present invention;

fig. 6 is a diagram of a structure of a PHY header according to an exemplary embodiment of the present invention;

fig. 7 is a diagram illustrating a structure of a Media Access Control (MAC) protocol data unit (MPDU) according to an exemplary embodiment of the present invention;

FIG. 8 is a diagram showing an order of bits for scanning divided sub-pixels;

fig. 9 is a diagram showing an example of a TDU including 4 bit levels;

fig. 10 is a diagram illustrating an example of a TDU including 1 bit level;

fig. 11 is a block diagram showing the configuration of a transmitter for transmitting a transport packet according to an exemplary embodiment of the present invention;

fig. 12 is a block diagram illustrating the construction of a receiver for receiving a transmission packet according to an exemplary embodiment of the present invention.

Detailed Description

Various aspects and features of the present invention and the manner of attaining them will become apparent from the following description of exemplary embodiments of the invention taken in conjunction with the accompanying drawings. However, the scope of the present invention is not limited to the exemplary embodiments, but the present invention can be implemented in various ways. The exemplary embodiments to be described below are provided so that the present invention is properly disclosed and to assist those skilled in the art in fully understanding the present invention. The invention is limited only by the scope of the claims. Further, like reference numerals are used to designate like parts throughout the specification.

Hereinafter, an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

Fig. 4 is a diagram illustrating a structure of a transport packet 70 according to an exemplary embodiment of the present invention. The transmission packet 70 includes: a Physical Layer Convergence Protocol (PLCP) header 77, an MPDU field 75, and a beam tracking field 76. The PLCP header 77 includes a preamble 71, a PHY header 72, a MAC header 73, and a Header Check Sequence (HCS) field 74.

The preamble 71 corresponds to a signal of the PHY layer for synchronization and channel estimation, and includes a plurality of short training signals and long training signals.

The PHY header 72 is a region generated based on information used in the PHY layer, and the MAC header 73 is a region generated based on information used in the MAC layer. The HCS field 74 is an area for determining whether an error occurs in the PLCP header 77.

The MPDU field 75 is an area in which data to be transmitted (i.e., uncompressed AV data) at a predetermined coding rate is recorded.

The beam tracking field 76 is a region in which supplementary information for beam control is recorded. Beam steering means setting the directivity of an antenna so as to be suitable for the reception direction of a radio signal having directivity. For example, a receiver for receiving radio signals having directivity receives the same radio signals having different phase bits from an array antenna by calculating a direction of arrival (DOA) from the sum of the received signals through Discrete Fourier Transform (DFT) and establishing the directivity of the corresponding direction of reception.

To this end, the beam tracking field 76 records information referred to when the directivity of the antenna is established in the receiver as described above.

Fig. 5 is a diagram illustrating a structure of a transport packet 80 according to another exemplary embodiment of the present invention. The transport packet 80 is identical to the transport packet 70 except that tail bits 81 and pad bits 82 are added to the HCS field 74 of the PLCP header 77. Tail bits 81 and pad bits 82 are added to the PLCP header 77 in consideration of the size of data when error correction coding is applied. The tail bits 81 serve to force the error correction encoder to a zero state. The padding bits 82 are inserted so as to cause the size of data to be an integer multiple of the number of bits used in one symbol.

Fig. 6 is a diagram illustrating the structure of the PHY header 72 according to an exemplary embodiment of the present invention. As shown in fig. 6, the PHY header 72 includes: a high rate phy (hrp) mode index field 72a, an MPDU length field 72b, a beam tracking field 72c, an error protection field 72d, an Unequal Error Protection (UEP) offset field 72e, and a reserved field 72 f.

Since the present invention uses a transmission rate exceeding 3Gbps in order to transmit uncompressed AV data, the PHY header 72 must be different from that of fig. 3. Thus, the PHY header 72 is defined as an HRP header.

The HRP mode index field 72a indicates the number of groups included in the MPDU75, a coding rate and a modulation method applied to each group, and the like. In an exemplary embodiment of the present invention, the mode index is defined to have a value from 0 to 6 as shown in table 1. Fields may also be arranged to indicate such things as: grouping information (number of bit levels included in a group), coding rate, and modulation scheme. However, if the pattern index is used, a plurality of item combinations may be indicated by using one index. The transmission mode table of table 1 corresponding to the mode index must be preset between the transmitter and the receiver or must be transmitted from the transmitter to the receiver.

TABLE 1

Referring to table 1, when the HRP mode index has a value ranging from 0 to 2, the EEP is applied. When the HRP mode index has a value of 3 or 4, UEP is applied to two divided groups. Where group 1 includes four higher bit levels ([7] [6] [5] [4]), and group 2 includes four lower bit levels ([3] [2] [1] [0 ]). In table 1, when UEP is applied, the number of divided groups is 2. However, the number of divided groups and the number of bit levels belonging to the respective groups may be set differently without limitation. In the case of 8-bit data, the number of divided groups may have a maximum value of 8.

Meanwhile, in retransmission, it should be noted that: only group 1 having relatively higher importance is retransmitted at the coding rate of 1/3, and group 2 having relatively lower importance is not transmitted (the coding rate is not limited).

Referring to fig. 6, the MPDU length field 72b indicates the size of the MPDU75 in octets. This field 72b is necessary in order to accurately read the MPDU75 having a variable size. For example, the MPDU length field 72 may comprise 20 bits.

The beam tracking field 72c is a 1-bit field. When the supplementary information for beam control is included in the transmission packet, the beam tracking field 72c is 1. Otherwise, the beam tracking field 72c is 0. That is, in fig. 4, if the beam tracking field 76 is added to the MPDU75, the beam tracking field 72c is 1. Otherwise, the beam tracking field 72c is 0.

The error protection field 72d indicates whether UEP is applied to bits included in the MPDU 75. This field 72d may indicate a particular UEP mode used among various UEP modes.

The UEP offset field 72e indicates the number of symbols for which UEP coding is started when counting is performed from the first symbol after the MAC header 73. In detail, the UEP offset field 72e may be represented by 10 bits.

The reserved field 72f is a field reserved for a specific purpose later.

In fig. 5, the MAC header 73 is an area in which information for medium access control is recorded, which is used for medium access control, similar to IEEE802.11 series standards or IEEE 802.3 standards. The MAC header 73 records MAC addresses of the transmitter and receiver, ACK policy, fragmentation information, and other information.

As shown in fig. 7, the MPDU field 75 includes a plurality of TDUs. In error correction coding, the same coding rate is applied to TDUs having the same number. The TDUs having higher importance may be arranged according to an order in which they precede TDUs having lower importance (or vice versa). In FIG. 7, there are n TDUs from set 0 to set (n-1). Of these, group (n-1) has the highest importance. The TDUs are sequentially arranged in this manner to form an arrangement unit. The permutation unit repeats to the end of the MPDU field 75 where the permutation is performed.

One TDU includes at least one bit level. Fig. 8 to 10 are diagrams illustrating one example of a configuration method of a TDU.

Fig. 8 is a diagram illustrating a scanning order when uncompressed AV data includes three sub-pixel components. In FIG. 8, T₀To T₇Indicating the order of the pixels, respectively. That is, along the slave T₀The scanning is sequentially performed in the left direction of the start. Fig. 8 shows a case where the number of bits scanned (the number of scans) in one bit level is 8.

The values of the inputted sub-pixels are sequentially stored in a predetermined buffer. In the storing process, the values are sequentially recorded in the memory according to the data input order. In the scan process, desired bits may be read according to an address order provided by the data address generator.

The scanning process is performed sequentially from the highest level bit to the lowest level bit. In an exemplary embodiment, since one pixel includes R, G and B components, scan is performed for bits of the R component of the highest level (i), scan is performed for bits of the G component of the highest level (ii), and scan is performed for bits of the B component of the highest level (iii). Next, for the R componentA higher bit₆"perform scan |. This process is repeated in the same manner until the scanning is completed for the bits of the B component of the lowest level.

After the scanning is completed for all bits of the sub-pixel component as described above, bits at each bit level are alternately scanned for the sub-pixels instead of scanning subsequent sub-bit components. This is to reduce reproduction delay that may occur at the receiver end that limits the number of scans. In the above description, the scanning order for the sub-pixels is R, G and B, but this order may be changed.

Fig. 9 is a diagram illustrating a group of bits multiplexed by the scanning process illustrated in fig. 8. According to the bits from the highest level₇Bits "bits to lowest level₀"the multiplexed bit stream 60 is arranged in the order of R, G and the bits of the same bit level are alternately arranged according to the B component. "bits" shown in FIG. 9₀"thereafter, the subsequent pixels (T) are arranged₈To T₁₅) Scanned "bits₇"to" bit₀". Thus, the TDUs may be repeatedly arranged.

Fig. 9 shows an example in which one TDU includes four bit levels, but the number of bit levels constituting the TDU may vary without limitation. As shown in fig. 10, one TDU may further include a minimum bit level, i.e., one bit level.

Fig. 11 is a block diagram showing the configuration of a transmitter 100 for transmitting the transmission packet 70 or 80 according to an exemplary embodiment of the present invention.

The transmitter 100 may include a storage unit 110, a bit divider 120, a multiplexer 130, a buffer 140, a channel encoder 150, a header generator 160, a modulation and Radio Frequency (RF) unit 170, a transmission mode table 180, and a mode selector 190.

The storage unit 110 stores uncompressed AV data. When the AV data is video data, a sub-pixel value of each pixel is stored in the storage unit 110. The sub-pixel values may be stored differently according to a color space (e.g., an RGB color space, a YCbCr color space, etc.). However, the present invention will be described based on the assumption that each pixel includes three sub-pixels, i.e., R, G and B, according to the color space. Of course, when the video data is a gray image, one sub-pixel may constitute one pixel because only one sub-pixel component exists. In addition, two or four sub-pixel components may also constitute one pixel.

In order to classify the divided bits according to importance, the multiplexer 130 scans and multiplexes the divided bits according to levels. Through the multiplexing process, a plurality of TDUs may be formed as shown in fig. 9 or 10.

The buffer 140 temporarily stores a plurality of TDUs generated by the multiplexer 130.

The channel encoder 150 performs error correction coding at a coding rate determined according to the TDUs stored in the buffer 140, thereby generating a payload. Information on the TDU (the number of bit levels included in the TDU) and a coding rate according to the TDU are provided from the mode selector 190. In the MPDU75 shown in fig. 7, TDUs of the same type (TDUx in fig. 7, "x" denotes an index indicating a TDU type) have the same coding rate.

Error correction coding can be roughly classified into block coding and convolutional coding. Block encoding (e.g., reed-solomon encoding) is a technique for performing encoding and decoding at each block of data, and convolutional encoding is a technique for performing encoding by comparing previous data with current data using a certain size of memory. It is known that block coding withstands burst errors, while convolutional coding withstands random errors.

Generally, error correction coding includes a process of converting input bits "k" into an n-bit codeword. Here, the coding rate may be represented by k/n. As the coding rate becomes lower, the error correction probability becomes higher because the input bits are coded into more bit codewords.

The results of the error correction coding are collected to form the payload, i.e., MPDU 75.

The header generator 160 generates a preamble 71, a PHY header 72, and a MAC header 73, and adds the generated preamble 71, PHY header 72, and MAC header 73 to an MPDU75 including a plurality of encoded TDUs, thereby generating a transmission packet 70 or 80 as shown in fig. 4 or 5.

Here, the HRP mode index field 72a of the PHY header 72 records a mode index. The mode index indicates a combination of grouping information (grouping scheme of TDU), a coding rate, a modulation scheme, and the like. The mode index is provided by mode selector 190. Further, the header generator 160 generates the respective fields 72b, 72c, 72d, and 72f of fig. 6 in addition to the field 72 a.

The modulation and RF unit 170 modulates the transmission packet by using the modulation scheme provided from the mode selector 190 and transmits the modulated transmission packet through the antenna.

The mode selector 190 selects one mode index from the transmission mode table 180 shown in table 1 based on the transmission environment of the transmission packet. The mode index indicates a combination of grouping information, a coding rate, and a modulation scheme. The mode selector 190 provides the channel encoder 150 with the grouping information and the coding rate according to the mode index and provides the modulation and RF unit 170 with the modulation scheme according to the mode index.

Fig. 12 is a block diagram illustrating the construction of a receiver 200 for receiving a transmission packet 70 or 80 according to an exemplary embodiment of the present invention.

The receiver 200 may include a demodulation and RF unit 210, a head reader 220, a channel decoder 230, a buffer 240, a demultiplexer 250, a bit assembler 260, a reproducer 270, a transmission mode table 280, and a mode selector 290.

The demodulation and RF unit 210 demodulates the received radio signal to recover the transmission packet. The demodulation scheme applied for demodulation may be provided from the mode selector 290.

The header reader 220 reads the PHY header and the MAC header added by the header generator 160 of fig. 11 and provides the channel decoder 230 with the MPDU (i.e., payload) from which the headers have been removed.

Here, the header reader 220 reads a mode index recorded in the HRP mode index field 72a of the PHY header 72 and provides the read mode index to the mode selector 290. Further, the head reader 220 reads the respective fields 72b, 72c, 72d, and 72f of fig. 6 in addition to the field 72 a.

The mode selector 290 selects grouping information, a coding rate and a demodulation scheme corresponding to the mode index provided from the header reader 220 with reference to the transmission mode table 280, provides the demodulation and RF unit 210 with the demodulation scheme, and provides the channel decoder 230 with the grouping information and the coding rate. The demodulation and RF unit 210 demodulates the radio signal according to a demodulation scheme.

The channel decoder 230 recognizes the type of TDUs constituting the current MPDU through the grouping information (the number of bit levels included in the TDUs) provided from the mode selector 290, and performs error correction decoding at a coding rate applied to the corresponding TDU. The coding rate is also provided by mode selector 290.

The error correction decoding is a process reverse to the error correction coding in the channel encoder 150, and includes a process of restoring original data of k bits from a codeword of n bits. Here, viterbi decoding is representatively used for error correction decoding.

The buffer 240 temporarily stores the TDUs recovered by the error correction decoding and provides the TDUs to the demultiplexer 250.

The demultiplexer 250 demultiplexes the recovered TDU and divides the TDU into bits of a plurality of bit levels. Bits from the highest level_m-1Bits "bits to lowest level₀"to sequentially divide the bits. When a pixel of video data includes a plurality of sub-pixel components, the divided bits may also exist according to the sub-pixel components. The demultiplexing process is a process reverse to the multiplexing process performed by the multiplexer 130 of fig. 11.

The bit assembler 260 assembles bits of a plurality of divided bit levels (from the highest level to the lowest level), thereby restoring uncompressed AV data (i.e., each sub-pixel component). The sub-pixel components (e.g., R, G and B components) restored by the bit assembler 260 are provided to the renderer 270.

If the renderer 270 collects each sub-pixel component, i.e., pixel data, and completes one video frame, the renderer 270 displays the video frame on a display device (not shown), such as a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and a Plasma Display Panel (PDP).

In the above description, uncompressed AV data is used as an example of video data. However, those skilled in the art will clearly understand that: the same method can be applied to uncompressed audio data such as a waveform file.

The components of fig. 11 and 12 may be implemented as software such as tasks, classes, subroutines, processes, objects, execution threads, and programs, or hardware such as field programmable gate arrays (EPGAs) and Application Specific Integrated Circuits (ASICs). Furthermore, the components may be implemented as a combination of software and hardware. The components may be included in a computer-readable storage medium or may also be partially distributed among multiple computers.

Industrial applicability

According to the present invention, a data structure suitable for transmitting a large amount of uncompressed AV data is provided, so that differential error correction encoding can be efficiently performed in consideration of the importance of bits constituting the uncompressed AV data.

Although exemplary embodiments of the present invention have been described for illustrative purposes, those skilled in the art will recognize that: various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying drawings.

Claims (21)

1. A transport packet for transmitting uncompressed AV data, the transport packet comprising:

a payload including a plurality of Transmission Data Units (TDUs) error-correction-encoded at a predetermined coding rate, wherein the payload is classified according to importance of bits constituting uncompressed AV data;

a medium control (MAC) header including information for medium access control; and

a physical layer (PHY) header including information on the predetermined coding rate.

2. The transport packet of claim 1, wherein the PHY header further comprises: information on the number of bit levels included in one of the plurality of TDUs, and information on a modulation scheme.

3. The transmission packet of claim 2, wherein the mode index is recorded in a PHY header, wherein the PHY header indicates a combination of information on the predetermined coding rate, information on the number of bit levels, and information on the modulation scheme.

4. The transmission packet of claim 3, wherein Unequal Error Protection (UEP) is applied to the payload, and the number of symbols starting the UEP is recorded in the PHY header.

5. The transmission packet of claim 4, wherein the PHY header includes a size of a payload and information on whether beam control information is included in the PHY header.

6. The transmission packet of claim 1, wherein one of the plurality of TDUs comprises at least one bit level.

7. The transmission packet of claim 6, wherein, in the plurality of TDUs, the same bit level is included in the same type of TDU.

8. The transmission packet of claim 6, wherein, in the plurality of TDUs, the same coding rate is applied to the same type of TDU.

9. The transmission packet of claim 1, further comprising: tail bits for causing error correction coding to be in a zero state; and padding bits for causing the size of the data to be an integer multiple of the number of bits used in one symbol.

10. A transmitter for transmitting uncompressed data, the transmitter comprising:

a unit generating a transport packet for transmitting uncompressed AV data; and

an RF unit which transmits the generated transmission packet,

wherein the transmission packet includes:

a payload including a plurality of Transmission Data Units (TDUs) error-correction-encoded at a predetermined coding rate, wherein the payload is classified according to importance of bits constituting uncompressed AV data;

a medium control (MAC) header including information for medium access control; and

a physical layer (PHY) header including information on the predetermined coding rate.

11. The transmitter of claim 10, wherein the PHY header further comprises: information on the number of bit levels included in one of the plurality of TDUs, and information on a modulation scheme.

12. The transmitter of claim 11, wherein the mode index is recorded in a PHY header, wherein the PHY header indicates a combination of information on the predetermined coding rate, information on the number of bit levels, and information on a modulation scheme.

13. The transmitter of claim 12, wherein Unequal Error Protection (UEP) is applied to the payload, and a number of a symbol starting the UEP is recorded in the PHY header.

14. The transmitter of claim 10, wherein one of the plurality of TDUs comprises at least one bit level.

15. The transmitter of claim 14, wherein in the plurality of TDUs, the same coding rate is applied to the same type of TDU.

16. A receiver for receiving uncompressed AV data, the receiver comprising:

a unit receiving a transport packet including uncompressed AV data; and

a unit of AV data is recovered from the received transport packet,

wherein the transmission packet includes:

a payload including a plurality of Transmission Data Units (TDUs) error-correction-encoded at a predetermined coding rate, wherein the payload is classified according to importance of bits constituting uncompressed AV data;

a medium control (MAC) header including information for medium access control; and

a physical layer (PHY) header including information on the predetermined coding rate.

17. The receiver of claim 16, wherein the PHY header further comprises: information on the number of bit levels included in one of the plurality of TDUs, and information on a modulation scheme.

18. The receiver of claim 17, wherein the mode index is recorded in a PHY header, wherein the PHY header indicates a combination of information on the predetermined coding rate, information on the number of bit levels, and information on the modulation scheme.

19. The receiver of claim 18, wherein Unequal Error Protection (UEP) is applied to the payload, and the number of symbols starting the UEP is recorded in the PHY header.

20. The receiver of claim 16, wherein one of the plurality of TDUs comprises at least one bit level.

21. The transmitter of claim 20, wherein in the plurality of TDUs, the same coding rate is applied to the same type of TDU.