Symbol interlacing method

FIELD: technology for exchanging digital data with usage of transfer system based on multiplexing with orthogonal frequency division of channels, including at least one transmitter, and receivers.

SUBSTANCE: method includes selection of operation mode in transmitter from at least one mode, while each operation mode is associated with a number of active carriers for transferring useful data, selection of interlacing symbol in aforementioned selected operation mode, usage of symbol interlacing in transmitter in relation with data element blocks, display of interlaced elements of data on active carriers of aforementioned selected operation mode, receipt of interlaced data elements in receiver, recognition in receiver of symbol interlacing symbol used during data transfer, selection of reversed interlacing symbol in receiver for match with recognized interlacing symbol and reverse interlacing in receiver of received data elements by means of selected reverse interlacing symbol.

EFFECT: increased stability of system due to efficient correction of errors.

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The technical field to which the invention relates

The invention relates to interleaving and facing the alternation. In particular, the invention relates to a character alternation and converted to character alternation in the system, based on the multiplexing orthogonal frequency division multiplexing (OFDM).

Prior art

Modulation type multiplexing orthogonal frequency division multiplexing encoding (COFDM) is used for broadcast or for group broadcasting, or by unidirectional transmission) broadband digital signals from the transmitter to many receivers. As one example, the system DVB-T (terrestrial digital video), defined in the ETSI (European telecommunications standards Institute) ETSI EN 300 744 (Version 1.4.1), is a system in which the modulation method type of multiplexing orthogonal frequency division multiplexing encoding (COFDM) is used to broadcast (or multicast broadcasting) broadband digital television signals from a transmitter DVB-T to many receivers DVB-T.

Typically, when the digital data exchange uses the multiplexing orthogonal frequency division multiplexing (OFDM), and OFDM is only one example of this.

As explains with the standards, before the digital data (e.g., encoded according to the MPEG-2 format (developed by the expert group on cinematography) video, audio and/or data stream) will be ready for transmission, the set of operations applied to them by the transmitter DVB-T. These operations include, among other things, external encoding by the encoder reed-Solomon outer interleaving (i.e. convolutional interleaving), the internal encoding (using perforated convolutional code internal interleaving.

Inner interleaving is performed in the inner interleaver, which contains a set of bit premaritally for bitwise interleave, followed by a symbol interleaver for character alternations. The appointment of the internal interleave is to improve the stability of the system to errors and interference by reordering subject to transfer digital data so that, basically, the information contained in subsequent/related sequences of digital data is not lost due to the transmission of adjacent carriers. In this case, interference occurring only from time to time at a frequency of only one or only a few supporting data, it is possible to make effective correction of errors, which is provided by the system.

In the system DVB-T transmitted signal is organized in frames. Each frame has a long is the spine and consists of 68 OFDM symbols. Each OFDM symbol, in turn, is formed by a set of bearing. The standard describes the use of two modes of operation: mode 2K and 8K mode". In the 2K mode, the carrying amount equals 1705, and in the 8K mode, the carrying amount equals 6817. However, only 1512 bearing of the total number 1705 carrier mode 2K and 6048 bearing of the total number 6817 bearing in the 8K mode is defined as "active" bearing, which really carry the digital data (e.g., payload, payload). Other carriers are used primarily for control purposes. It should be noted that using a different method of calculation, which takes into account the special protective bandwidth can be obtained the total number of bearing 2048 (2K mode) or 8192 (8K mode). These quantities correspond to the size of the FFT (OBPF) in each case (FFT = fast Fourier transform, OBPP = inverse FFT). However, the number of active bearing is still 1512 (2K mode) or 6048 (8K mode).

Displaying the digital data words of data, also called bit words or data elements) on the active bearing is in the inner interleaver. More precisely, this problem is solved symbol interleaver. A separate "character interleaver 2K" is defined for the 2K mode, and "character 8K interleaver for the 8K mode. In the 2K mode character parami the tel 2K displays 1512 data words (that is, 12 groups of 126 data words, the length v of each data word is equal to v = 2, 4 or 6 bits depending on the used modulation method), coming from a set of bit premaritally on 1512 active bearing of one OFDM symbol mode 2K. Similarly in mode, 8K symbol interleaver 8K displays 6048 data words (48 groups of 126 data words) 6048 active bearing of one OFDM symbol of the 8K mode.

Recently the system DVB-T was evaluated for situations for which it was not originally designed, such as mobile reception. Also new scenarios of system usage, such as IPDC (broadcast transmission of digital data over an Internet Protocol (IP)), have different system requirements. The use of the existing regime 8K DVB-T is likely to offer a fairly wide radio coverage for mobile reception. However, the achieved mobility mode 8K may be too slow, i.e. the technique may be unsuccessful, for example in a fast-moving vehicle, as at a speed of 120 km/h Mode 2K, on the other hand, will offer sufficient mobility. However, when mode is 2K would require a high density of base stations, because the length of the guard interval is not large enough to sustain long distances to the transmitter in this mode. One proposed a compromise solution to this is th problem is to define a new mode: "mode 4K".

As for the internal alternations proposed 4K mode, especially for the character of the interleaver, the obvious solution would be to define a new "character interleaver 4K, which would reflect 3024 data words (24 groups of 126 data words) 3024 active bearing of one OFDM symbol mode 4K (it is likely that the number of active bearing would 3024 in 4K mode). However, this solution, of course, requires more space in the transmitter DVB-T and, in particular, in many receivers, DVB-T as a new character interleaver 4K (or converted interleaver) must be implemented in each device.

To overcome the above described disadvantages, there is a need for new method and system for transmitting digital data, as well as new types of transmitters and receivers for the implementation of the new method and system.

Disclosure of invention

According to the first aspect of the invention provides a method of sharing digital data with the use of the transmission system, based on the multiplexing orthogonal frequency division multiplexing (OFDM), comprising at least one transmitter and the receivers, and the method comprises the following steps:

the operation mode is selected in the transmitter of the at least one mode, and each mode is associated with a number and the effective bearing for the payload;

the choice of the character of the interleaver in the transmitter from a set of character of premaritally for character alternation in said selected mode of operation;

using character alternation in the transmitter in relation to blocks of data elements;

displaying perenesennyj data elements on the active bearing referred to the selected mode of operation;

welcome perenesennyj data elements in the receiver.

detection in the receiver of the character of the interleaver used in the transmission of data;

the choice facing the interleaver in the receiver to match the recognized symbol interleaver, and

facing interleaving in the receiver the received data elements using the selected facing the interleaver.

Because the invention allows to select the operation mode and symbol interleaver different way, it is possible to provide different depths alternation depending on the different requirements imposed on the system. Previously this was not possible, since the fixed specific character interleaver was always used with a specific mode of operation.

According to the second aspect of the invention provides a transmitter for digital data exchange using the transmission system, based on the multiplexing orthogonal frequency division multiplexing (OFM), moreover, this system has a set of modes, and the set contains at least one operation mode, and each mode is associated with a preset number of active carriers used for transmitting useful data from the transmitter to the receiver, and the transmitter contains:

the character set of premaritally for character interleave,

means for selecting the mode of operation for data transfer and

means for selecting a character of the interleaver of the aforementioned character set of premaritally for character alternation in said selected mode of operation.

According to a third aspect of the invention provides a receiver for digital data exchange using the transmission system, based on the multiplexing orthogonal frequency division multiplexing (OFDM), and this system has a set of modes and the set contains at least one operation mode, and each mode is associated with a preset number of active carriers used for transmitting useful data from the transmitter to the receiver, and the system further comprises a set of character premaritally used for character alternation in the transmitter and the receiver contains:

means for receiving perenesennyj data elements;

means for recognizing involing of the interleaver, used when transferring data;

the set of converted character premaritally converted to interleave the received data elements that premiani in the transmitter symbol interleaver, and

means for selecting a converted character of the interleaver from the set of drawn symbolic of premaritally corresponding to the recognized character interleaver.

According to a fourth aspect of the invention provides a system for the exchange of digital data using the transmission system, based on the multiplexing orthogonal frequency division multiplexing (OFDM), containing at least one transmitter and many receivers, and the system has a set of modes, and the set contains at least one operation mode, and each mode is associated with a preset number of active carriers used for transmitting useful data from a transmitter to at least one receiver, and the transmitter has a set of character premaritally used for character alternation in respect of blocks of data elements in the transmitter, and at least one receiver has a set of drawn symbolic of premaritally converted to interleave perenesennyj data elements in the receiver, and the system further comprises:

means in peredach the ke, used to select the mode to be used when transferring data;

means in the transmitter, is designed to select a character of the interleaver for character alternation in the selected mode of operation;

means in the transmitter, designed for use above mentioned character alternation in respect of blocks of data elements;

means in said at least one receiver designed to receive transmitted perenesennyj data elements;

means in said at least one receiver designed to recognize the character of the interleaver used in the transmission of data;

means in said at least one receiver designed to select the converted character of the interleaver from the set of drawn symbolic of premaritally corresponding to the recognized character interleaver.

According to the fifth aspect of the invention provides a character interleaver for use based on the character blocks alternation in respect of items of data, such as data words, to display the above data elements on the active bearing a specific operation mode, based on the OFDM system, the number of data elements to be alternation at a time, determined by the size of the block:

the symbol interleaver configured to use a block size that is different from the number of active bearing in said specific mode.

The dependent claims contain preferred embodiments of the invention. The entity disclosed in the dependent claims related to a particular aspect of the invention also apply to other aspects of the invention.

List of figures

Embodiments of the invention will now be described by example with reference to the accompanying drawings, in which:

Figure 1 - internal interleaver according to the DVB-T;

Figure 2 - principle of symbolic alternation DVB-T;

Figure 3 - symbol interleaving according to a preferred variant embodiment of the invention;

Figure 4 - symbol interleaving according to another preferred variant embodiment of the invention;

Figure 5 - symbol interleaving according to another preferred variant embodiment of the invention;

6 - blocks of the transmitter DVB-T suitable for implementation variant embodiment of the invention;

Fig.7 - blocks of the DVB-T receiver, suitable for realization of a variant embodiment of the invention;

Fig system in the embodiment of the invention for transmitting digital data; and

Fig.9 - mobile receiver suitable for implementing a variant embodiment of the invention.

Detailed description

In the following description of various embodiments, reference is made to accompanying drawings which form a part thereof and in which by way of illustration, shows the various options for implementation, according to which the invention can be implemented in practice. It is clear that can be used in other embodiments of, and structural and functional modifications may be made without departing from the scope of the present invention.

First contact Fig, where the system 10 to exchange digital data shown in the context of digital data to one or more receivers 600, 601 from one or more transmitters 700, 701 through many routes 11, 12, 13, 14 radio interface. The system 10 is in accordance with the embodiment of the present invention system multiplexing orthogonal frequency division multiplexing (OFDM).

Figure 1 shows the internal interleaver 100, as defined in the standard EN 300 744 (Version 1.4.1) ETSI DVB-T. Figure 1 applies also to the description of the invention. Internal interleaver can be implemented either in hardware or in software, or in combinations thereof. Hardware implementation suitable for the semiconductor, the ellite components is preferred. The input stream x0, x1, x2,... demultiplexed in the demultiplexer 110 v substream, while v is the number of bits per modulation symbol. In the example case of figure 1 is used by the modulation method is 16-point quadrature amplitude modulation (16-QAM), in which the number of bits per symbol of the modulation is equal to 4 (v=4).

Bit interleaving (and subsequent character interleaving) based on blocks and is only in respect of the payload (payload). Each subflow from the demultiplexer 110 is processed by a separate bit interleaver using a sequence of alternation, which is defined separately for each bit of the interleaver. The substream b0,0ba 0.1that... is transferred to the first bit interleaver I0. The substream b1,0b1,1that... is transferred to the second bit interleaver I1. The substream b2,0b2,1that... is transferred to the third bit interleaver I2, and the substream b3,0b3,1that... is transmitted to the fourth bit interleaver I3. The used block size in bit interleaving is equal to 126 bits. Therefore, each subflow b0,0ba 0.1,..., b1,0b1,1,..., b2,0b2,1... and b3,0b3,1the... consists of 126 bits.

The first bit interleaver I0 produces an output bit stream and 0,0anda 0.1,.... The second bit interleaver I1 produces the output bit stream and1,0and1,1,.... The third bit interleaver I2 produces the output bit stream and2,0and2,1... , and the fourth bit interleaver I3 produces an output bit stream and3,0and3,1,.... Each of the output bit streams and0,0anda 0.1... , and1,0and1,1... , and2,0and2,1... and a3,0and3,1the... consists of 126 bits.

The output bit streams from the v bit of premaritally (in this example, v=4) are transferred to the symbol interleaver 130. The output bit streams join together to form data words so that each word of data from the v bit (v=4) had one bit of each bit of the interleaver. In this case formed of 126 data words, each consisting of v bits. Character interleaver 130 punctuates these data words. It should be noted that symbol interleaver bits of the data words are received in a row, but interspersed with the very words of data. In the 2K mode, as defined in the standard, 12 groups of 126 data words (12·126=1512) alternate for the purpose of displaying them on 1512 active bearing of one OFDM symbol mode 2K. Accordingly, the size of the block character of the interleaver 2K equals 1512 words of data. Similarly, in the 8K mode 48 groups of 126 data words (48·126=6048) alternate for the purpose of display is supply them 6048 active bearing of one OFDM symbol mode 8K. Accordingly, the block size character 8K interleaver is equal 6048 said data. Depending on the implementation of the symbolic premarital different modes (mode 2K, mode 8K) can be implemented as separate components of the character of the interleaver or they can be integrated into a single "combined" symbol interleaver.

The number of data items, such as data words, as described above, which alternate symbol interleaver, and the number of active bearing that peremerzanie data elements are displayed for transfer are in the embodiment of the invention integers, one of which is a multiple of another. In another embodiment of the invention the number of data elements that are interspersed in symbol interleaver, and the number of active carriers which appear peremerzanie data elements that are odd integers, one of which is a multiple of another. The number of data items, i.e. the block size, in character alternation may be greater or less than the number of active bearing in this mode, which is used for data transmission and which appear peremerzanie data elements.

Character interleaver produces output Y0, Y1,..., where Y0represents a sequence of plumage is Eugene 1512 (2K mode) or 6048 (8K mode) data words, belonging to the first OFDM symbol 2K or 8K. Accordingly, Y1is peremerzanie data words of the second OFDM symbol.

Figure 2 shows the principle character alternation of DVB-T. it Should be noted that for clarity, Figure 2 shows only a simplified case. Figure 2 is divided into two parts: the upper part shows the words Sn,kdata to symbolic alternation, and the lower part shows the words Sn,kdata after character alternations. The index n indicates the sequence number of the considered OFDM symbol, and the index k indicates the sequential order of the data words to symbolic alternations. For example, S0,5specifies the sixth (the subscript starts at 0) word data belonging to the first OFDM symbol.

As described previously, in the real case, the number of data words that fall within one OFDM symbol, equals 1512 (2K mode) or 6048 (8K mode). However, in the simplified case of figure 2 shows the number is only 16. This is done according to the drawings and technical reasons.

The words of S0,0-Sof 0.15data belonging to the first OFDM symbol, interspersed with each other. Similarly the words of S1,0-S1,15data belonging to the second OFDM symbol, interspersed with each other, and so on. The lower part of Figure 2 shows a sample result of the alternation. You can see that the depth is PE is Emesene character interleave, corresponding to the DVB-T standard, equal to one OFDM symbol, since data words belonging to the same OFDM symbol, interspersed within the area of one OFDM symbol. Because the block size is exactly the same as the number of active bearing that corresponds to one OFDM symbol, no intersymbol alternation is not done here between data words belonging to different OFDM symbols.

According to a preferred variant of the invention, the interleave depth is changed. Here are three preferred option for implementation. In the first embodiment, the character alternation 8K is used in conjunction with the proposed regime 4K. In the second embodiment, the character 2K alternation is used in conjunction with the proposed regime 4K. In the third embodiment, the character alternation 8K is used together with the 2K mode.

Figure 3 shows the symbol interleaving according to the first preferred variant embodiment of the invention. It should be noted that again for clarity, Figure 3 shows only a simplified case. Figure 3 is divided into two parts: the upper part shows the words Sn,kdata to symbolic alternation, and the lower part shows the words Sn,kdata after character alternations. The index n indicates then Davy the number of the considered OFDM symbol, and the index k indicates the sequential order of the data words to symbolic alternation (the subscript starts at 0). It should also be noted that although the upper part of Figure 3 (and Figure 4 and 5) already refer to the OFDM symbols and data words belonging to the OFDM symbols, the OFDM symbols really are formed only later in the transmitter. However, for clarity, the term "OFDM symbol" is already used in this context. More specifically, the term "data words belonging to the same OFDM symbol" really means only the amount of data, i.e. the number of data words that end up in one OFDM symbol.

Figure 3 illustrates the use of the character of the interleaver 8K 4K mode. If the 4K mode is implemented similarly to the existing modes 2K and 8K, the number of bearing in the 4K mode is equal to 3024. Accordingly, the number of data words that fall within one OFDM symbol mode 4K, also equals 3024. This is exactly equal to the number of data words that fall within one OFDM symbol mode 8K, and twice the number of data words that fall within one OFDM symbol mode 2K. However, in the simplified case, Figure 3 shows the number of data words that fall within one OFDM symbol of the 4K mode is only 8. This is done according to the drawings and technical reasons.

Now, when a character 8K interleaver (size 6048 block which is double the number of data words, which fall within one OFDM symbol of the 4K mode) is used in the 4K mode, twice the number of words of data that falls within one OFDM symbol mode 4K, punctuated at one time according to the rules of the character of 8K interleaver. In terms of Figure 3, the first 16 words in S0,0-S1,7data are interspersed with each other. From these data words, the first eight words of S0,0-S0,7data belong to the first OFDM symbol 4K, and these eight characters of words S1,0-S1,7data belong to the second OFDM symbol 4K. Similarly, the words of S2,0-S3,7data belonging to the third and fourth OFDM symbols, interspersed with each other, and so on.

The lower part of Figure 3 shows a sample result of the alternation. You can see that the depth of the interleave character interleave according to the first preferred variant implementation is equal to two OFDM symbols (4K mode), because the data words that would get in one OFDM symbol mode 4K, interspersed in the field of two OFDM symbols (4K mode). Accordingly, when the character of the interleaver mode 8K (size 6048 unit which is double the number of words of data that fall within one OFDM symbol mode 4K) 4K mode, character alternation occurs between the data words belonging to two adjacent OFDM symbols of the 4K mode.

The fact that molinae interleaving overlaps more than one OFDM symbol, improves the system's ability to cope with pulse-like disturbances and unexpected changes (dynamics) in the channels. The use of the existing character of the interleaver mode 8K mode 4K without the need to define a new symbol interleaver for the 4K mode. This will save space in the transmitter DVB-T, and especially in many of DVB-T receivers, because you do not need any new scheme for additional interleaver (or facing the interleaver).

Figure 4 shows the symbol interleaving according to the second preferred variant embodiment of the invention. It should be noted that again for clarity, Figure 4 shows only a simplified case. Figure 4 is divided into two parts: the upper part shows the words Sn,kdata to symbolic alternation, and the lower part shows the words Sn,kdata after character alternations. The index n indicates the sequence number of the considered OFDM symbol, and the index k indicates the sequential order of the data words to symbolic alternation (the subscript starts at 0).

Figure 4 illustrates the character of the interleaver 2K to 4K mode. As described previously, the number of data words that fall within one OFDM symbol mode 4K equals 3024. However, in the simplified case, Figure 4 shows the number of words of data to the categories fall into one OFDM symbol mode 4K, is only 8. This is done according to the drawings and technical reasons.

Now, when a character interleaver 2K (size 1512 block which is half the number of data words that fall within one OFDM symbol of the 4K mode) is used in the 4K mode, half the number of data words that fall within one OFDM symbol mode 4K, punctuated at one time according to the rules of the character of the interleaver 2K. In terms of Figure 4, the first 4 words of S0,0-Sfor 0.3data are interspersed with each other. Similarly, the following 4 words Sfor 0.4-S0,7data are interspersed with each other, and so on.

The lower part of Figure 4 shows a sample result of the alternation. You can see that the depth of the interleave character alternation, according to the second preferred variant implementation, equals half of the OFDM symbol (4K mode), because the first half and the second half of the data words belonging to the same OFDM symbol of the 4K mode, interspersed independently.

The character of the interleaver mode 2K mode 4K compared to the character of the interleaver mode 8K 4K mode has advantages related to the converted character interleaving in DVB-T. Although the converted character interleaving in DVB-T receiver in conjunction with the character of the interleaver mode 8K mode 4K which may begin only at the beginning of every second of the received OFDM symbol 4K (, the size of the block character of the interleaver mode 8K is double the number of words of data that fall within one OFDM symbol of the 4K mode), symbol interleaving in conjunction with the character of the interleaver mode 2K mode 4K can start at the beginning of any received symbol OFDM 4K. In this case, the use of character interleave mode 2K mode 4K provides a shorter delay.

Figure 5 shows the symbol interleaving according to a third preferred variant embodiment of the invention. It should be noted that again for clarity, Figure 5 shows only a simplified case. Figure 5 is divided into two parts: the upper part shows the words Sn,kdata to symbolic alternation, and the lower part shows the words Sn,kdata after character alternations. The index n indicates the sequence number of the considered OFDM symbol, and the index k indicates the sequential order of the data words to symbolic alternation (the subscript starts at 0).

Figure 5 illustrates an implementation option in the character of the interleaver 8K 2K mode. As described previously, the number of data words that fall within one OFDM symbol mode 2K equals 1512. However, in the simplified case figure 5 shows the number of data words that fall within one OFDM symbol mode 2K, equally is only 4. This is done according to the drawings and technical reasons.

Now, when a character 8K interleaver (size 6048 block which is quadruple the number of data words that fall within one OFDM symbol mode 2K) is used in the 2K mode, quadruple the number of data words that fall within one OFDM symbol mode 2K, punctuated at one time according to the rules of the character of 8K interleaver. In terms of Figure 5, the first 16 words in S0,0-S3,3data are interspersed with each other. From these data words, the first four words of S0,0-Sfor 0.3data belong to the first OFDM symbol 2K, the following four words S1,0-S1,3data belong to the second OFDM symbol 2K, and the following four words S4,0-S7,3data belong to the third OFDM symbol mode 2K, and so on. Similarly the words of S4,0-S4,7data belonging to the fifth, sixth, seventh and eighth OFDM symbols, interspersed with each other, and so on.

The lower part of Figure 5 shows a sample result of the alternation. You can see that the depth of the interleave character alternation according to a third preferred variant implementation of equals four OFDM symbols of the 4K mode, since data words belonging to the same OFDM symbol mode 2K, interspersed in the field of four OFDM symbols of the 2K mode. Accordingly, when used with wolnego the interleaver mode 8K mode 2K inter-symbol interleaving is performed between data words, owned by four adjacent OFDM symbols of the 2K mode.

As described in connection with the first preferred embodiment, the fact that the character alternation covers more than one OFDM symbol, improves the system's ability to cope with pulse-like disturbances and unexpected changes (e.g., fading) channels. The character of the interleaver mode 8K mode 2K thus contributes to the stability to generally weak pulse noise mode 2K. This type of use can be useful in mobile systems, and therefore, high mobility mode 2K can now be combined with more good resistance against impulse noise mode 8K.

6 shows blocks of the transmitter 600 DVB-T suitable for carrying out the invention. The transmitter DVB-T as such well-known specialists in this field of technology. Experts in the art also know that the transmitter DVB-T can contain other blocks than shown in Fig.6.

The transmitter 600 DVB-T contains external encoder 610, which carries out encoding of reed-Solomon in respect of the transferred digital data. The outer interleaver 620 performs convolutional interleaving with respect to digital data. Internal encoder 630 encodes digital data using perforated vertacnik the code. The operation of the internal interleaver 100 in relation to the present invention described above. Internal interleaver 100 corresponds to an internal interleaver of figure 1 and includes a demultiplexer 110, a set of bit of premaritally and the character set of premaritally 130. The tool 150 choice character of the interleaver is designed to select one of a set of character of premaritally. This tool 150 select character interleaver connected with the internal interleaver. The tool 640 display modulates bearing according to the selected signal constellation (a set of signals) QAM. In the preferred embodiment mode of the invention, which refers to the number of active carriers is selected by using the 645 mode selection. Block 650 personnel adaptation organizes transmitted signal into frames and adds to the HR pilot signals (discrete and continuous), as well as carrying TPS (signaling transfer parameters), which he takes from a block 655. Modulator 660 OFDM performs inter alia the inverse fast Fourier transform (OBPF) in order to convert the transmitted signal from the frequency to the time domain. Block 670 the introduction of a guard interval introduces a guard interval at the beginning of each OFDM symbol. D / a Converter 680 converts the transmitted signal from the digital analogues in the second region. The external interface 690 cares about the transmission of DVB-T signal through the antenna.

The transmitter 600 DVB-T works in more than one mode (i.e. the mode 2K, mode, 4K or 8K mode)corresponding to the number of active carriers (that is, 1512, 3024 or 6048 active bearing). The transmitter 600 DVB-T contains a tool 645 to select among the available modes (the number of available modes may be one or more) and the tool 150 to select one of the available character premaritally 130 (that is, for example, the character of the interleaver 2K, 4K or 8K). The transmitter 600 may also contain a means for embedding the preferred character of the interleaver in the transmitted signal of the transmitter 600. The choice of the character of the interleaver 130 among the available character premaritally internal interleaver 100 can be made so that the selected character interleaver differed from the character of the interleaver associated with the selected mode of operation. In this embodiment mode, which is understood as related to the number of active carriers and the block size defines the number of data words that are subject to alternation at one time may, therefore, differ from each other.

It should be noted that regardless of the used character of the interleaver in any mode, the remainder of p is redakcija DVB-T works as required by the considered mode. So, for example, when a character 8K interleaver used in the 4K mode, the inverse fast Fourier transformation is still in progress at one time in terms of number of words of data in respect of which it is usually performed in 4K mode. It should also be noted that the used character interleaver does not affect the bitwise interleaving, i.e. bitwise interleaving is performed in the same manner regardless of the character of the interleaver.

The digital data transmitted by the transmitter DVB-T, can be, in particular, the decoded broadcast digital television signal MPEG-2, audio signal broadcasting system, such as system broadcasting over Internet Protocol, or their combination.

7 shows a variant implementation of the blocks of the receiver 700 DVB-T suitable for carrying out the invention. DVB-T receiver as such well-known specialists in this field tehniki. Specialists in this field technici it is also known that the receiver 700 DVB-T can contain blocks that are different from those shown in Fig.7.

The receiver 700 DVB-T contains the external interface 710, which receives the transmitted DVB-T signal through the antenna. Analog-to-digital Converter 780 converts the signal from analog to digital area. The demodulator 760 OFDM in the operates, in addition, the fast Fourier transform (FFT) to convert the received signal from time to frequency domain. Personnel demultiplexer 750 demuxes received OFDM frames. The tool 740 converts the display performs an operation reverse to the device 640 display transmitter 600 DVB-T.-Interior interleaver 200 performs an operation reverse to the inner interleaver 100. Accordingly, the inner facing interleaver 200 contains a set of drawn symbolic of premaritally, followed by inverted bit premarital. The control unit 701 is connected to the external interface 790, analog-to-digital Converter 780, demodulator 760 OFDM, personnel demultiplexer 750, 740 converts the display and internal facing the interleaver 200 for time and frequency synchronization, total correction of phase errors, channel estimation, and reliability assessment. In one embodiment, the control unit 701 receives information from other blocks 790, 780, 760, 750, 740 and 200, United with him, and generates control signals based on the received information to control the processing of the data mentioned in the other blocks. These operations include the recognition of the interleaver used in the transmitted signal, and selecting the appropriate Abramenkov is the interleaver. In this embodiment, the control unit 701, thus, acts as a tool used for recognition of the interleaver in the transmitter and means for selecting one of the available converted character premaritally for drawn symbolic alternation, the choice is based on said indication of the selected character of the interleaver on the transmitting end, which is an indication of the transmitter 600 DVB-T built-in signal which the receiver of DVB-T. the Inner decoder 730, exterior-facing interleaver 720 and an external decoder 710 perform an operation reverse to the operation of the respective blocks 630, 620 and 610 transmitter 600. Before the transmitted digital data in their original form will be received, the received signal is usually further processed in blocks, not shown in Fig.7. These blocks can include diskriminirovaniya, encoding video, audio and/or data.

The receiver can, for example, be fixed DVB-T receiver, installed in a television set-top box, or a mobile DVB-T receiver integrated into a mobile handheld device, such as, for example, portativnyi mobile phone. In addition to the broadband reception, the receiver may, in particular, to have a return channel via a cellular radio network, such as GSM, GPRS, WLAN, UMTS or ALL IP. As viola is rnative or in addition it may be of a fixed reverse channel using DECT technology or fixed telephone lines.

In one embodiment of the invention, as illustrated in Fig.9, portable mobile phone 800 has a receiver 802 DVB-T reception OFDM and the second transceiver 801 for conventional mobile communication. Portable mobile phone may also include a display 810. DVB-T receiver in the portable mobile phone provides a means for recognition of the interleaver used in the transmission of the OFDM signal, set facing premaritally and means for selecting facing the interleaver based on the detected interleaver.

As described above in connection with the variants of the invention may be used in the internal interleaver (especially character interleaver)that is different from the interleaver, originally developed for the operation mode (2K, 4K or 8K). A variant embodiment of the invention provides for selecting one operation mode from a set of available modes and the selection of one character of the interleaver (or internal interleaver containing the symbol interleaver) from a variety of available character premaritally for use in the selected mode. In other words, this implementation provides a symbolic premarital with any modes, thereby providing different depths alternations. The following table shows the alternatives. Table mo is et to be expanded, if it is determined any other mode, such as 1K or 16K.

ModeCharacter interleaverThe depth of the interleave
8K8KOne OFDM symbol
8K4KSymbol paremesan twice
8K2KSymbol paremesan four
4K8KTwo OFDM symbol
4K4KOne OFDM symbol
4K2KSymbol paremesan twice
2K8KFour OFDM symbol
2K4KTwo OFDM symbol
2K2KOne OFDM symbol

In the DVB-T receiver converts the character and bitwise interleaving is performed in the inner facing the interleaver 200 (Fig.7).

If you are using a character interleaver different from specially developed for a particular mode, the information used by the interleaver can be transferred from the transmitter to the receiver so that the receiver can be correctly converted interleaving the transmitted OFDM symbols.

One possibility zaklyuche the Xia used in specifying the character of the interleaver using one or more bits of the TPS. In this alternative choice character of the interleaver is encoded by one or more bits, and these bits form part of the TPS bits. In the transmitter (6) blocks 650 and 655 set these bits according to the used symbol interleaver. In the receiver (7) control unit 701 and the inner facing interleaver respectively interpret the received bits.

Another possibility is used in specifying the character of the interleaver at the application level (or at least in a higher Protocol level in the Protocol stack than the physical level).

In a system in which the alarm about the used mode interleave (symbol interleaver) are not realized, the receiver can according to one variant embodiment of the invention used to determine the interleave mode, trying some mode converted alternation (e.g., reversed alternation mode 8K) and measuring the frequency error bits. If the received error rate bit too high, the receiver tries another mode is turned alternation until then, until you find the correct mode.

Next, the receiver should receive information location perenesennyj characters. However, due to the fact that well-known synchronization TPS in any case at the beginning of the connection, it also is the environmental management plan will achieve synchronization for internal facing of the interleaver.

It should be noted that although described only using symbolic of premaritally mode 2K, 4K and 8K, the application is not limited to these modes. The invention can also be used in the context of other possible modes of operation, such as, for example, mode 1 mode 0,5K or 16K.

Described specific implementations and embodiments of the invention. Although in this description the system DVB-T is used as an example of the system based on OFDM, the invention can also be applied in other systems based on OFDM, such as the Japanese system of terrestrial broadcasting with integrated digital services (ISDB-T). It should also be noted that in one embodiment of the invention can be used in the transmitter, which has only one mode, but more than one character interleaver. Suitable symbol interleaver may be chosen for this mode, depending on the desired depth of the interleave.

Specialist in the art it is clear that the invention is not limited to the details shown above embodiments, but that it can be implemented in other embodiments using equivalent means without deviating from the characteristics of the invention. Scope of the invention limited only by the attached claims.

1. the manual of digital data exchange using the system (10) of the transmission, based on the multiplexing orthogonal frequency division multiplexing (OFDM), comprising at least one transmitter (600, 601) and the receivers (700, 701)containing phases in which

select the operating mode in the transmitter of the at least one mode, and each mode is associated with a number of active bearing for transmitting useful data;

choose the symbol interleaver in the transmitter from a set of character of premaritally for character alternation in said selected mode of operation;

apply character interleaving in the transmitter in relation to blocks of data elements;

display peremerzanie data elements on the active bearing referred to the selected mode of operation;

take peremerzanie data elements in the receiver.

recognize the receiver symbol interleaver used in the transmission of data;

choose facing interleaver in the receiver to match the recognized symbol interleaver and

perform in the receiver converts interleaving the received data elements using the selected facing the interleaver.

2. The method according to claim 1, in which the number of data items in a block in respect of which used symbolic alternation, differs from the number of active ECUSA in said selected mode.

3. The method according to claim 2, in which the number of data items in the block and the number of active bearing in said selected mode are integers, one of which is a multiple of another.

4. The method according to claim 3, in which the number of data items in the block and the number of active bearing in said selected mode are even integers, one of which is a multiple of another.

5. The method according to any of claim 2 to 4, in which the number of data elements in the block is greater than the number of active carriers.

6. The method according to claim 5, in which the number of data elements in the block is equal to twice or multiple of twice the number of active carriers.

7. The method according to any of claim 2 to 4, in which the number of data elements in the block is less than the number of active carriers.

8. The method according to claim 7, in which the number of active bearing is equal to twice or multiple of twice the number of data items in the block.

9. The method according to claim 1 or 2, in which the choice of the character of the interleaver for character alternation in the selected operation mode based on the desired depth of the interleave.

10. The method according to claim 1 or 2, in which the said set of character premaritally contains at least a symbolic 8K interleaver and symbol interleaver 2K and at least mode 4K you can choose for DVB-T (terrestrial digital video).

11 the Method according to claim 1 or 2, in which the said set of character premaritally contains at least a symbolic 8K interleaver and at least mode 2K, you can choose to DVB-T.

12. The method according to claim 1, in which the data elements are data elements of one or more OFDM symbols.

13. The method according to claim 1, in which the transmission system of digital data is one of the following systems: system DVB-T (terrestrial digital video)system, ISDB-T (terrestrial broadcasting with integrated digital services).

14. The method according to claim 2, in which the data elements form part of any broadband digital television transmission, or broadcast transmission of digital data.

15. Transmitter (600, 601) for exchanging digital data with the use of the transmission system, based on the multiplexing orthogonal frequency division multiplexing (OFDM), and this system has a set of modes and the set contains at least one operation mode, and each mode is associated with a preset number of active carriers used for transmitting useful data from the transmitter to the receiver (700, 701), and the transmitter contains

the character set of premaritally (130) for character interleave,

means for selecting the mode of operation for data transfer and

means for selecting the character of the interleaver of the aforementioned character set of premaritally for character alternation in said selected mode of operation.

16. The transmitter 15 in which the said set of character premaritally (130) forms part of the inner interleaver (100) of the transmitter.

17. The transmitter according to any one of p and 16, in which the transmitter (600) configured to transmit information indicating mentioned selected character interleaver, for receiver (700) OFDM.

18. The transmitter 17, in which one or more bits of the TPS (signaling transfer parameters) are used to transmit said information indicating mentioned selected character interleaver.

19. Receiver (700) for exchanging digital data with the use of the transmission system, based on the multiplexing orthogonal frequency division multiplexing (OFDM), and this system has a set of modes and the set contains at least one operation mode, and each mode is associated with a preset number of active carriers used for transmitting useful data from the transmitter (600) to the receiver, and the system further comprises a set of character premaritally (130), used for character alternation in the transmitter and the receiver contains

means for receiving perenesennyj data elements;

means for recognizing a character of the interleaver used in the transmission of data;

set broshennyh character premaritally converted to interleave the received data elements, which premiani in the transmitter symbol interleaver, and

means for selecting a converted character of the interleaver of the mentioned set of drawn symbolic of premaritally corresponding to the recognized character interleaver.

20. The receiver according to claim 19, in which the receiver (700) is configured to receive information indicating the used character interleaver.

21. The receiver according to claim 19, in which the output means for recognizing a character of the interleaver used in the transmission of data, is information indicating the recognized character interleaver.

22. The receiver according to any one of p-21, in which the receiver (700) is either stationary receiver or mobile receiver.

23. The receiver according to any one of p-21, in which the receiver (700) includes a tool for reverse channel via the cellular radio network and/or via the fixed network.

24. System digital data exchange using the transmission system, based on the multiplexing orthogonal frequency division multiplexing (OFDM), containing at least one transmitter (600, 601) and multiple receivers (700, 701), and this system has a set of modes and the set contains at least one operation mode, and each mode is associated with a preset kolicestve.akteven bearing, used for transmitting useful data from a transmitter to at least one receiver, and the transmitter has a set of character premaritally (130), used for character alternation in respect of blocks of data elements in the transmitter, and the at least one receiver has a set of drawn symbolic of premaritally converted to interleave perenesennyj data elements in the receiver, and the system further comprises

means in the transmitter, is designed to select the mode to be used when transferring data;

means in the transmitter, is designed to select a character of the interleaver for character alternation in the selected mode of operation;

means in the transmitter, designed for use symbolic alternation in respect of blocks of data elements;

means in said at least one receiver designed to receive transmitted perenesennyj data elements;

means in said at least one receiver designed to recognize the character of the interleaver used in the transmission of data;

means in said at least one receiver designed to select the converted character of the interleaver from a set of drawn symbols is lnyh of premaritally, corresponding to the recognized character interleaver.

25. The system of paragraph 24, in which the ratio between amounts of active bearing in various operating modes is an integer.

26. The system of paragraph 24, in which the ratio between amounts of active bearing in various modes of operation is two or multiples of two.

27. System according to any one of p and 25, in which the number of character premaritally in the above-mentioned character set of premaritally less than the number of system modes.



 

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