KR100813038B1 - Method and apparatus for data processing in a transmission chain - Google Patents

Abstract

TECHNICAL FIELD The present invention relates to next generation mobile communications, and in particular, to a method of constructing a new transmission chain for supporting variable or multivariate data rates for information bit strings having arbitrary data rates. According to the present invention, a data processing method in a transmission chain includes a specific interleaving size and a length of input data input for a predetermined time for channel encoding in a variable or flexible data rate mode. Channel coding the input data at a coding rate determined according to a ratio of to; Matching the length of the channel coded data with the specific interleaver size; And performing interleaving on the matched data.

Normal data rate, variable data rate, multivariate data rate, radio structure, transmission chain

Description

Method and apparatus for data processing in a transmission chain

1 illustrates a transmission chain of variable data rate and multivariate data rate for a turbo code according to the present invention.

2 illustrates a transmission chain of variable data rate and multivariate data rate for a convolutional code in accordance with the present invention.

3 illustrates a radio architecture (RC) in the forward link to support variable data rate and multivariate data rate for 1X in accordance with the present invention;

TECHNICAL FIELD The present invention relates to next generation mobile communications, and more particularly, to a method and apparatus for data processing in a transmission chain of next generation bi-communication for supporting a variable or multivariate data rate for an information bit string having an arbitrary data rate.

In general, in addition to the normal data rate mode, there are two transmission modes in the data transmission mode of the next generation mobile communication (hereinafter, referred to as 3GPP2), a variable data rate mode and a multivariate data rate mode.

The normal data rate mode refers to a transmission mode that operates on a fixed chain called a radio configuration (hereinafter referred to as RC).

RC can be thought of as a type of transmission chain in which the length of the information data, the length of the channel interleaver, and the length of the output string of the channel encoder according to the code rate of the channel code are matched. At this time, there is a formal rule between the length of the channel interleaver, the coding rate of the channel encoder, and the length of the Walsh code of the channel.

In other words, when the chip rate to be used is determined, the number of chips into one modulation symbol is determined according to the length of the channel interleaver, which can be defined as a spreading factor. The length of the Walsh code that can code multiplex the channels is determined.

At this time, the number of available Walsh codes is in proportion to the length of the Walsh code. Accordingly, the number of channels that can be accommodated in the multiplexing chain varies according to the Walsh code.

Consider the length after channel coding for input information bits having the same length. In this case, the ability of an error correction code to correct an error that may occur in a channel is stronger as the coding rate of the channel encoder is lower.

In other words, the lower the coding rate of the channel encoder is, the better the error correction capability is, and thus the lower the transmission power can be used. However, when a channel coder having a low code rate is used, the length of the output string of the channel encoder is increased, thereby increasing the length of the channel interleaver.

This results in an increase in the modulation symbol rate, thereby reducing the number of chips entering one modulation symbol at a fixed chip rate.

Therefore, the number of useful Walsh codes is reduced.

On the contrary, if the channel coding technique of high coding rate is used for the input string of the same length channel encoder, the error correction capability is reduced but the length of the output string of the channel encoder is shortened. Length of channel interleaver may be used, resulting in an increase in the number of Walsh codes that may be useful.

As described herein, it can be seen that there is a trade-off relationship between the coding rate of the channel encoder and the Walsh code space. Considering this trade-off relationship, RC can be thought of as a formalization of a transmission chain that can be used to secure Walsh code space, or a transmission chain that can be used when lower transmission power is required. .

Currently, 3GPP2 defines several RCs for 1X systems using a chip rate of 1.2888Mcps and some formal RCs for 3X systems using a chip rate of 3.6864Mcps.                         

One thing to note here is that the spreading factor has an exponential value of 2, so that the input data rate and the length of the interleaver defined in each RC are also increased by twice.

Before the traffic channel is established between the terminal and the base station, the terminal and the base station determine the RC to be used through the negotiation process and the length of the spreading factor on each RC, that is, the channel interleaver, and the communication process proceeds according to the chain.

The modes of using a transmission chain other than the transmission chain defined on the RC are the variable data rate mode and the multivariate data rate mode.

Variable data rate mode is a transmission method that can support any data rate in addition to the standard data rate supported by each RC. This variable data rate was introduced to support Adaptive Multi-Rate (hereinafter abbreviated as AMR) codec, which is one of the 3GPP speech codecs on the physical layer of 3GPP2.

That is, in the case of AMR, data bits that do not match the standard data rate supported by each RC of 3GPP2 can be dropped during the frame period for 20ms.

Next, there is what is called a multivariate data rate mode. The purpose of this mode is to:

In the 3GPP2 system, the base station schedules transmission on the forward auxiliary channel. At this time, the base station allocates a fixed data rate to the terminal through a message.                         

However, the channel situation between the base station and the specific terminal may change during that particular time, and the system load of the base station may also change.

For example, as the terminal moves away from the base station, the situation of the channel may change, and the channel environment may deteriorate, and thus, the base station may not have sufficient transmit power for transmitting at a current data rate to a specific terminal.

To solve this problem, the base station may stop transmitting to the auxiliary channel during this time. This solution, however, causes delays in data transmission and can also cause unnecessary waste of useful transmission power and Walsh codes.

Another solution is to consider how the base station reschedules the transmission data rate after a certain amount of time. However, this also causes problems such as time delay and waste of Walsh code.

This situation is not unique to the forward link. Likewise, in the reverse link, the channel state between the terminal and the base station may change according to the movement of the terminal, and thus, there may be a lack of transmission power to maintain proper quality.

Thus, a mode called multivariate data rate has been used to solve this situation. In this mode, the transmission rate is changed in units of frames depending on the situation. That is, if it is determined that the channel environment is worsened, the base station lowers the transmission rate of the auxiliary channel. If it is determined that the channel environment is recovered again, it can be considered that the transmission mode is performed again at the previous transmission rate. Using this multivariate data rate mode, the base station can use the power available at the base station without frequent rescheduling.

In order to support the variable data rate mode and the variable data rate mode, each RC of 3GPP2 currently configures a transmission chain using the following method.

As described above, the length of the channel interleaver used in each RC is determined according to the spreading factor. At this time, since the spreading factor has a value increasing in the form of an exponential power of 2, the length of the interleaver determined for a certain spreading factor and the length of the interleaver determined for the spreading factor one step lower than that is exactly 1: 2. Will have a relationship with

In this case, let the large spreading factor A be the small spreading factor B. Then, in each RC, a 1: 1 mapping relationship is established between the spreading factor and the information bit string input to the channel encoder. If the length of the information bit string input to the channel encoder for the spreading factor A is I _A , and the length of the information bit string input to the channel encoder for the spreading factor B is I _B , then I _B = 2 * I _A Will have a relationship with Also, if the length of each channel interleaver to be used is N _A and N _B , there will be a relationship of N _B = 2 * N _A.

In this case, consider a variable data rate mode in which I satisfying a relationship of "I _A <I <I _B " rather than the length of data to be normalized becomes the length of an input string of a channel encoder.

Assuming that the coding rate of the channel incubator used in the current RC is 1 / n, the output of "n * I" will be sent for the input of I.

At this time, the relationship of "N _A <n * I <N _B " is satisfied. Therefore, some work is required to match the length "n * I" of the output string of the channel encoder to the interleaver length.

The current approach taken by 3GPP2 is to match the length L (= n * I) of the output string of the channel encoder to the interleaver of N = N _B. Accordingly, bit repetition of "N _B -n * I" is performed. The method of doing this performs a uniform iteration process of the following form.

번째 입력 비트열의 코드 심볼로부터 추정 가능하다.That is, the kth output symbol of the iteration block is for index k that increases from 0 to N-1.

It can be estimated from the code symbols of the first input bit string.

Next, a method for supporting the multivariate data rate mode will be described.

In multivariate data rate mode, the maximum data rate, one level lower data rate, and two levels lower data rate that can be supported during the initial negotiation process are defined as a set of transmission data rates.

Therefore, in the multivariate data rate mode for the current auxiliary channel, the data rate of the auxiliary channel is adjusted between the support rate up to two levels below. At this time, if the forward channel is considered, the terminal must determine the rate variation through the blind rate detection. Accordingly, if the data transmission rate is too large, a problem arises that increases the complexity of the terminal.

The length of the channel interleaver and the Walsh code used at the maximum data rate should not be changed. In other words, the interleaver and Walsh codes specified for the maximum transmission rate currently used are used as they are.

Therefore, if the data rate is lowered to 1/2 of the maximum rate, the symbol repetition is doubled to match the length of the interleaver to be used in the channel and the length of the output string of the channel encoder.

Similarly, if the data rate is lowered to 1/4 of the maximum data rate, four times symbol repetition is performed to match the length of the interleaver to be used in the channel and the length of the output string of the channel encoder.

That is, in the current method, a matching process with a specific spreading factor is performed by repeating the code symbol as described above.

)로 정의하고, 각각의 RC상에서 정의하고 있는 코드 레이트를 1/n이라고 가정하는 경우에 가변 데이터 레이트 모드 나 다변 데이터 레이트 모드에 있어 RC상에서 정규화되어 있는 체인을 제외한 다른 모든 임의의 데이터 레이트 상에서는 다음의 관계를 가지게 된다는 것이다.One thing to note here is that the effective code rate is the ratio of the length N of the interleaver to the length I of the information bit string input to the channel encoder.

Assuming that the code rate defined on each RC is 1 / n, then on any other data rate except the chain normalized on the RC in either the variable data rate mode or the multivariate data rate mode: Will have a relationship.

<

<

In other words, in the variable data rate mode or the multivariate data rate mode, it means that the effective code rate is lowered, and that it is used repeatedly for the matching process with the interleaver. This means that the effective code rate is reduced, but the actual code rate is still 1 / n specified on RC.

Therefore, it can be considered that both the current variable data rate mode and the multivariate data rate mode have a problem of losing a gain that can be obtained on transmission power through an increase in coding gain due to a decrease in coding rate.

That is, if the length of the interleaver is set to a certain value, and the transmission rate of the data to be transmitted currently is determined, the coding rate for obtaining the maximum coding gain is selected according to the relationship between the two. There is a need to construct a new transmission chain that performs rate matching puncturing or data matching repetition to match the length of the channel interleaver.

Accordingly, an object of the present invention has been devised in view of the above-described problems of the prior art, and is a next-generation movement in which an information bit string having no regular data rate is mapped on a physical layer in a variable data rate or a multivariate data rate transmission mode. The present invention provides a method and apparatus for processing data in a transmission chain of communication.

Another object of the present invention is to provide a method and apparatus for data processing in a transmission chain of next-generation telecommunications for introducing a new radio structure to support not only a regular data rate but also a variable data rate or a variable data rate mode.

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As an aspect of the present invention for achieving the above object, a data processing method in a transmission chain according to the present invention, in a mobile communication system supporting a variable or flexible data rate mode (variable or flexible data rate mode) And channel coding the input data by a coding rate that is variably determined among at least two coding rates according to a specific interleaving size and a ratio of lengths of input data input for a predetermined time for channel coding. Matching the length of the channel coded data with the specific interleaver size, and performing interleaving on the matched data by an interleaver having the specific interleaver size. Characterized in that configured.
In still another aspect of the present invention, a data processing apparatus in a transmission chain according to the present invention is a mobile communication system that supports a variable or flexible data rate mode, and includes a specific interleaver size and channel encoding. A channel encoder for channel encoding the input data by a coding rate variably determined among at least two or more coding rates according to a ratio of lengths of input data input for a predetermined time, and A rate matching block for performing rate matching to match a length to the specific interleaver size, and an interleaver for interleaving the rate matched output data by the specific interleaver size. It is characterized by.
In the present invention, when operating in a variable data rate mode and a multivariate data rate mode, a channel coding scheme is used that can make the effective coding rate as low as possible under a channel environment in which the length of the spreading factor or channel interleaver specified during negotiation is defined. .

Therefore, the present invention proposes two methods of constructing a new transmission chain or a new RC in each RC that can most efficiently support the variable data rate mode and the multivariate data rate mode.

First, we propose a method of harmonizing the prerequisites in an existing RC to construct a new transmission chain in each RC.

Second, the new RC configuration proposes a RC configuration method that can use a multivariate data rate for a variable data rate.

Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

Firstly, the first method to support variable data rate and multivariate data rate in each RC is as follows.

If the length of the information bit string input to the channel encoder defined in each RC is I, and the length of the channel interleaver defined for this is N, in the normal data rate mode, the ratio of 1: 1 between I and N is normal. The chain is formed.

However, it can be considered that the above 1: 1 chain condition is not satisfied in the variable data rate or the multivariate data rate mode. Therefore, a new chain must be made to connect the length N of the channel interleaver in the current RC with the length I of the information bit string input to the channel encoder. The method used for this purpose is defined differently for the turbo code and the convolution code.

First embodiment

1 is a diagram illustrating a transmission chain of a variable data rate and a multivariate data rate for a turbo code according to the present invention.

Referring to FIG. 1, when an information bit string (having length I) consisting of channel bits, CRC error bits, and tail bits is input to the channel encoder, a chain other than the normal data rate chain defined on each RC must be formed. In the case of using a 1/5 rate turbo encoder as a channel encoder (S30). The output string length L of the channel encoder uses rate matching puncturing (5 * I> N) or rate matching repetition (5 * I <N) for matching between "5 * I" and the length N of the channel interleaver. (S31).

The rate matching puncturing or repetition method uses a method of uniformly performing an information bit string input to a channel encoder.                     

The above chain is possible because the 1/2, 1/3, and 1/4 rate turbo codes used in each RC are punctured from the 1/5 rate turbo code.

For example, consider the variable data rate mode of RC4, and consider the case where the length I of the information bit string input to the channel encoder is 769 bits.

In this case, the length N of the channel interleaver will be 3072 bits. Therefore, when the chain is constructed by the conventional method, the length L of the output string of the channel encoder is 1538 (= 769 * 2), and the bits of (3072-1538) are added to fit the channel interleaver length N (3072). Will have to be repeated.

This results in an effective coding rate of 3.994 (3072/769) but still an actual coding rate of 1/2.

However, when the transmission chain proposed in the present invention is used, L becomes 3845 (5 * 769), and puncturing as much as (3845-3072) will be performed in order to fit the channel interleaver length (N = 3072). will be.

As a result, the actual coding rate itself is 3.994 (3072/769), so that the actual coding gain can be obtained.

As another example, when the length I of the information bit string input to the channel encoder using the turbo code is 1535, the length N of the channel interleaver will be 3072 bits.

When the chain is formed by the conventional method, the length L of the output string of the channel encoder is 3070 (1535 * 2), and bits (3072- 3070) need to be repeated in order to fit the channel interleaver length (N = 3072). will be.

Accordingly, the effective coding rate is 2.001 (3072/1535), so that the actual coding rate is almost the coding rate used on RC using the proposed transmission chain.

Similarly, when using the transmission chain proposed in the present invention, L becomes 7675 (5 * 1535), and puncturing as much as (7675-3072) will be performed to fit the channel interleaver length (N = 3072). will be.

Accordingly, the actual coding rate itself is 2.001 (3072/1535), which is expected to give the same performance as the effective coding rate that can be obtained in a conventional transmission chain.

This is because the 1/2 rate turbo code itself is a code obtained by applying puncturing to the 1/5 rate turbo code.

Therefore, by using the transmission chain proposed in the present invention, it is possible to give good performance in all variable data rate ranges.

However, the situation may be different when the convolution code is used. For example, consider forward RC4.

Consider the case of using a convolutional code of 1/4 code rate on all chains not defined on RC. In this case, as in the previous example, consider the case where the length I of the information bit string input to the channel encoder is 769 bits. In this case, the length N of the channel interleaver will be 3072.                     

When the transmission chain is constructed by the conventional method, the length L of the output string of the channel encoder is 1538 (769 * 2), and this bit is equal to (3072-1538) to fit the length of the channel interleaver (N = 3072). Will have to be repeated.

The effective coding rate will thus be 3.994 (3072/769) but the actual coding rate will still be half. However, if the transmission chain proposed in the present invention is used, L is 3076 (4 * 769), and puncturing as much as (3072-769) will be performed to fit the channel interleaver length (N = 3072). will be.

As a result, the actual coding rate itself is 3.994 (3072/769), so that the actual coding gain can be obtained.

As another example, however, if the length I of the information bit string input to the channel encoder is 1535, the length N of the channel interleaver will be 3072.

Therefore, if the chain is constructed by the conventional method, the length L of the output string of the channel encoder is 3070 (1535 * 2), and bits (3072-3070) will have to be repeated to fit N.

As a result, the effective coding rate is 2.001 (3072/1535), so that the actual coding rate is almost the coding rate currently used by RC.

However, if the transmission chain proposed in the present invention is used, L becomes 6140 (4 * 1535), and puncturing as much as (6140-3072) is performed to fit it to the channel interleaver length N (= 3072). Will be done.

As a result, the actual coding rate itself is 2.001 (3072/1535).                     

However, the coding rate here is the coding rate obtained through puncturing of about 50% from 1/4 rate. In the case of convolutional codes, unlike in the case of turbo codes, the optimal code polynomials for 1/2 rate, 1/3 rate, and 1/4 rate are defined respectively. The chain's method can have parts that can degrade performance. In order to solve this problem, the present invention proposes two solutions.

Second embodiment

Here, a method of configuring a transmission chain of RC for supporting a variable or multivariable data rate mode of another method when using a convolution code instead of a turbo code in the first embodiment is proposed.

First, in a convolutional code, when a chain other than a regular data rate chain is to be formed on each RC, a convolutional coder of 1 / n rate is used as a channel encoder.

Rate matching puncturing (n * I> N) or rate matching repetition (n * I <N) is used for matching between the length L (= n * I) of the output string of the channel encoder and the length N of the channel interleaver. do. In this case, the inverse n of the coding rate should be a value that is appropriately determined according to the relationship between I and N. This value should be set to give the best performance.

That is, n is determined according to the ratio of I and N as follows.

<2.5 ----> n=2

<2.5 ----> n = 2

2.5≤<3.5 -----> n=3

2.5≤ <3.5 -----> n = 3

3.5≤ ------> n=4

3.5≤ ------> n = 4

Second, we propose a method of constructing a transmission chain for a variable data rate and a variable data rate for a convolutional code.

2 illustrates a transmission chain of variable data rate and multivariate data rate for a convolutional code in accordance with the present invention.

Referring to FIG. 2, in the convolutional code, when a chain other than the normal data rate chain is to be formed on each RC, a convolutional coder having a 1 / n rate is used as the channel encoder (S30). Rate matching puncturing (n * I> N) or rate matching repetition (n * I <N) is used for matching between the length L (= n * I) of the output string of the channel encoder and the length N of the channel interleaver. (S31). In this case, the inverse n of the coding rate is a value signaled at the upper level and is a value determined in the negotiation process.

That is, by adding the inverse of the coding rate to the parameter signaled in the negotiation process for the conventional variable data rate or the multivariate data rate mode, it is possible to configure a variable chain for the convolutional code and a transmission chain for the multivariate data rate.

Here, as in the first embodiment, the rate matching puncturing or rate matching repetition method is performed uniformly with respect to the information bit string input to the channel encoder.

For example, assume that a negotiation process is performed to use the variable data rate mode on the current forward RC4. If the interleaver size N is 3072 and I is 1535, n may be signaled as two.

This signaling enables the construction of a transport chain that always provides the same or better performance than the current variable data rate mode or multivariate data rate mode.

The methods described above were designed to construct a new transmission chain for variable data rate and multivariate data rate transmission on each of the currently defined RCs.

However, a more fundamental approach is to define new RCs that support variable and multivariate data rates.

Third embodiment

For example, the variable and multivariate mode RC for forward 1X can be defined as shown in Figure 4 below.

3 is a diagram illustrating RC on a forward link to support variable data rate and multivariate data rate for 1X according to the present invention.                     

Referring to FIG. 3, the transmission chain of the new RC is configured as follows. First, in the CRC bit block S40, a CRC bit having a length of {6, 8, 12, 16} is added to the channel input bit for error detection. In this case, the method of determining the length of the CRC in the new RC may be signaled in the initial negotiation step between the transmitter and the receiver.

After the CRC bit is added to the channel input bit, the tail bit or reserved bits are added to this bit string. In this case, eight tail bits are added when using a convolutional code, and six tail bits and two reserved bits are added in the case of a turbo code. As a result, if the length of the channel input bit is x and the length of the CRC is c, the length of the input string to the channel encoder may be defined as I = x + c + 8 (S41).

The turbo code is defined to be used only when the length I of the input string of the channel encoder is 384 or more, and always has a code rate of 1/5 rate. In order to use this RC, the following things must be promised during the initial negotiation phase.

First, the information data rate and spreading factor to be used, that is, the length N of the channel interleaver must be promised. The length of the CRC bit to be used must be promised. It also promises to use turbo codes or convolutional codes.

In this case, when using a turbo code, only a 1/5 rate channel encoder is used. On the other hand, when the convolutional code is to be used, the inverse n of the coding rate of the convolutional code is {2,3,4, 6} may be set to one value, or alternatively, may be signaled in an initial negotiation step (S42).

The performance of the RC defined in this way will give the same performance as the data rate modes in the chain of the regular data rate mode across all existing RCs, and considering the data rate chain in the variable data rate mode and the multivariate data rate mode, As a result, it is possible to use transport chains that always perform better or perform the same.

Note that in the third embodiment, the upper limit of channel bits on the physical layer is not set separately.

In the case of using the maximum transmission rate in the forward 1X, the number of channel bits was 6,120 bits / 20ms, which was limited to 6,144 bits with 16 bits of CRC and 8 bits of tail. It is then matched to an interleaver size of 12,288 through half rate channel coding.

However, when applying RC in the present invention, it is possible to eliminate such an upper limit condition. That is, a code having a higher coding rate may be used instead of using only 1 / 2-rate code, and it is also possible to match 12,288, which is the maximum interleaver size, by rate matching puncturing. It is possible to remove the upper limit.

As a result, it is possible to configure an RC that covers a higher transmission rate than the maximum transmission rate supported by the existing RC. Here, the maximum transmission rate may be considered as a value that can be signaled according to the instantaneous channel condition.

Similarly, a reverse RC for 1X can be defined, and a new RC for forward 3X and reverse 3X can be defined.

As described above, the present invention provides a new transmission chain for supporting variable data rates and multivariate data rates, and can have excellent performance through larger coding gains under the premise of using the same spreading factor through the chain. It is possible to configure the chain.

In addition, it provides a new RC itself to support variable data rates and variable data rates, and through this RC alone, it is possible to support all data rates on the normalized transmission chain on all existing RCs without degrading performance. Improved coding gains on data rates and multivariate data rates enable the construction of transmission chains to have better performance. In addition, it is possible to define a transmission chain having a higher transmission rate than the maximum transmission rate that existing RCs can support.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the examples, but should be defined by the claims.

Claims (21)

In a mobile communication system supporting a variable or flexible data rate mode, Channel-encoding the input data by a coding rate variably determined among at least two or more coding rates according to a specific interleaving size and a ratio of lengths of input data input for a predetermined time for channel encoding. step; Matching the length of the channel coded data with the specific interleaver size; And And performing interleaving by the interleaver having the specific interleaver size on the matched data. The method of claim 1, wherein the matching step, And puncturing the channel-coded data or performing symbol repetition to match the specific interleaver size. The method of claim 1, And the coding rate is set to any one of 1/2, 1/3, and 1/4. The method of claim 1, And the coding rate is determined by any one of 1/2, 1/3, 1/4, and 1/5. The method according to claim 3 or 4, The coding rate is signaled in the negotiation process for a variable or multivariate data rate mode (signaling). The method according to any one of claims 1 to 4, And said channel coding is turbo coding. The method according to any one of claims 1 to 4, And the channel coding is convolution coding. delete delete delete delete delete delete delete In a mobile communication system supporting a variable or variable data rate mode, A channel encoder for channel encoding the input data by a coding rate variably determined among at least two or more coding rates according to a ratio of a specific interleaver size and a length of input data input for a predetermined time for channel encoding; A rate matching block for performing rate matching to match the length of the channel coded data to the specific interleaver size; And And an interleaver for interleaving the rate matched output data by the specific interleaver size. The method of claim 15, And the rate matching block performs rate matching by puncturing channel symbol data or performing symbol repetition in the channel encoder. The method of claim 15, And the coding rate is determined by any one of 1/2, 1/3, and 1/4. The method of claim 15, And the coding rate is set to any one of 1/2, 1/3, 1/4, and 1/5. The method of claim 17 or 18, And the coding rate is signaled in a negotiation process for a variable or multivariate data rate mode. The method according to any one of claims 15 to 18, And the channel encoder is a turbo encoder. The method according to any one of claims 15 to 18, And the channel encoder is a convolution encoder.

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