KR20090027136A - Apparatus and method for transmitting and receiving data in time-frequency slicing system - Google Patents

Abstract

A data transmitting/receiving apparatus in a time frequency slicing system and a method thereof are provided to reduce a hardware load of a receiver and latency by an efficient P1,P2 symbol transmission method. A receiver receives an RF signal. The RF signal includes a data symbol including service data, the first pilot symbol including information for identifying a frame for a time frequency slicing system and the second pilot symbol including information for accessing the data symbol. A synchronization unit(202) detects the motive of the received signal and performs compensation. A symbol demodulator(203) demodulates the first pilot, the second pilot and the data symbol. An equalizer(206) compensates for channel distortion of a radio frequency signal. A parameter detection unit(205) extracts the second pilot symbol from the compensated distortion signal and configuration information from the data symbol. A decoding unit(209) decodes physical layer information from the compensated distortion signal.

Description

Data transmitting apparatus in a time-frequency slicing system and method

The present invention relates to an efficient data transmission and reception apparatus and method. More specifically, the present invention relates to an apparatus and method for efficiently transmitting and receiving data in a communication system based on time-frequency slicing.

Time-Frequency Slicing (TFS) is introduced for next generation broadcasting networks. In this technique, as shown in FIG. 1, one service is distributed over time and RF channel space. This shows a statistical multiplexing gain that can efficiently transmit more services since the space for deploying services in the multiplexing of the transmission stage is extended from one conventional RF channel band to a plurality of RF channel bands. In addition, one service can be distributed to a plurality of RF channels to obtain the resulting frequency diversity gain (Frequency diversity gain).

A frame structure for transmitting a service using a time-frequency slicing scheme has been proposed. As shown in FIG. 1, this frame structure transmits a pilot signal or a reference signal named P1 and P2 at the beginning of each frame.

P1 is a pure pilot symbol and has a quarter guard interval of 2K FFT mode. The P1 signal is designed to occupy only 6.82992MHz within the total 7.61MHz band and proposed to have similar tendency in other bands. For this purpose, only 256 carriers of 1705 active carriers are used. On average, one carrier is used for every six carriers, and the patterns are irregularly arranged at intervals of 3, 6, and 9. This can be seen in FIG. 2. The carrier used is modulated by Binary PSK (BPSK) and Pseudo Random Bit Sequence (PRBS), and indicates the FFT size used for P2 using a plurality of PRBSs. Through this, the receiver can recognize the TFS frame, know the FFT size used, and can perform coarse frequency and timing synchronization.

P2 has the same FFT size and guard interval as the data symbol and uses one of every three carriers as a pilot carrier. P2 has been proposed for four main purposes.

The first is fine frequency and fine timing synchronization.

Secondly, the layer information L1 is transmitted. L1 information describes the physical parameters of the transmission signal and the configuration of the frame.

Thirdly, channel estimation is performed to decode P2 symbols. This information can also be used later as the initial value of the channel estimate for the data symbol.

Fourthly, another layer information (L2) is transmitted. L2 information describes information related to a service to be transmitted. That is, the receiver can obtain information about a service in a TFS frame by decoding only P2, thereby efficiently channel scanning.

Basically, P2 is proposed to consist of two OFDM-symbols in 8k mode, one symbol for a larger FFT size and more symbols for a smaller FFT size. This ensures that the capacity that can be sent to P2 is at least equal to 8k mode.

32k: 1 P2 symbol

16k: 1 P2 symbol

8k: 2 P2 symbols

4k: 4 P2 symbols

2k: 8 P2 symbols

If the required signaling capacity is insufficient for the proposed symbol, an additional OFDM symbol may be added after the proposed P2. The L1 information transmitted to P2 is encoded through coding with error correction capability, and evenly mixed throughout the P2 symbols by the interleaver to be robust to impulse noise. The L2 signal is also processed with coding with error correction capability, which can be processed with the same code used for the data symbols, and evenly mixed within the P2 symbols by the interleaver.

Since the L1 signal has frame configuration information and physical layer information directly necessary for the receiver to decode the data symbol, it is difficult for the receiver to decode the data symbol information immediately following the P2 symbol in P2. For this reason, as shown in FIG. 3, the L1 information in P2 has information about one frame size, but has information from a position separated by a signaling window offset after the P2 symbol.

Data symbols include scattered pilots and continuous pilots in various forms for channel estimation for decoding of data symbols.

L1 signaling includes the following information.

Length indicators, for the flexible use of L1 and L2 signaling channel

Frequency indicator

Guard Interval

Maximum number of FEC blocks per frame, for each physical channel

Actual (real) number of FEC blocks in FEC block buffer for current and previous frame for each physical channel

-For each slot

 Frame number for the service

Slot start address, with OFDM-cell (carrier) accuracy

Slot length in terms of OFDM-cells

Number of padding bits in the last OFDM-cell

Service modulation

Service code rate

Information on the MIMO-scheme

Cell-id

Flags for notification messages and service information

Frame number of current frame

additional bits for future use

An object of the present invention is to provide a structure of a receiver for receiving a TFS frame in a TFS system.

An object of the present invention is to provide a new pilot structure and signaling method for more efficient transmission and reception in a TFS frame structure.

A receiver of a time frequency slicing system according to an embodiment of the present invention includes a data symbol including service data, a first pilot symbol including information for identifying a frame for a time frequency slicing system, and accessing the data symbol. A receiver configured to receive an RF signal including a second pilot symbol including information for performing the same; A synchronizer configured to detect and compensate for synchronization of the received RF signal; A symbol demodulator for demodulating the first pilot, the second pilot, and the data symbol; An equalizer for compensating for channel distortion of the RF signal; A parameter detector configured to extract configuration information from a second pilot symbol and a data symbol among the distortion compensated signals; And a decoding unit for decoding physical layer information among the distortion compensated signals, wherein the conversion parameters of the first pilot symbol and the second pilot symbol are the same as the conversion parameters of the data symbols.

According to an embodiment of the present invention, a method of decoding a time and frequency sliced signal includes: a data symbol including service data, a first pilot symbol including information for identifying a frame for a time frequency slicing system, and the data symbol Receiving an RF signal comprising a second pilot symbol that includes information for accessing a; Detecting and compensating for synchronization of the received RF signal; Demodulating the first pilot, the second pilot, and the data symbol; Compensating for channel distortion of the RF signal; Extracting configuration information from a second pilot symbol and a data symbol of the distortion compensated signal; And decoding physical layer information among the distortion compensated signals, wherein the conversion parameters of the first pilot symbol and the second pilot symbol are the same as the conversion parameters of the data symbols.

According to an embodiment of the present invention, a storage medium for storing a frame for a time frequency slicing system includes: a data symbol including service data; A first pilot symbol comprising information for identifying a frame for a time frequency slicing system; And a second pilot symbol including information for accessing the data symbol, wherein the conversion parameters of the first pilot symbol and the second pilot symbol store the same frame structure as the conversion parameter of the data symbol. .

The transmitter of a time frequency slicing system according to an embodiment of the present invention classifies data including a plurality of services for each service, and provides information for identifying a data symbol including the service data and a frame for the time frequency slicing system. A service constructing unit configured to convert a first pilot symbol, and a second pilot symbol including information for accessing the data symbol to form a transmission frame; A frequency divider for dividing the transmission frame into RF channels; And a modulator for modulating the separated data, wherein the conversion parameters of the first pilot symbol and the second pilot symbol are the same as the conversion parameters of the data symbols.

According to an embodiment of the present invention, a storage medium for storing an ensemble constituting a frame for a time frequency slicing system includes: a data symbol including service data; A first pilot symbol comprising information for identifying a frame for a time frequency slicing system; And a second pilot symbol including information for accessing the data symbol, wherein the second pilot symbol includes layer information for accessing information of a physical layer, and the layer information is static that does not change for each frame. Information, wherein the static information includes channel information to which the ensemble is transmitted and version information of the layer information.

According to the present invention, it is possible to provide a frame structure for more efficient transmission in a system using a TFS scheme.

According to the present invention, the P1 symbol of the TFS system can be modified to provide more robust detection and offset estimation, and the transmission mode can be modified to provide channel information for P2 decoding.

In addition, according to the present invention it is possible to modify the P2 symbol of the TFS system to eliminate the operation required for P2 symbol detection and facilitate the expansion of the FFT size.

According to the present invention, it is possible to provide a method for easily determining the location of a service and the location of a pilot through numbering of data symbols.

According to the present invention, it is possible to greatly reduce the amount of time and computation required for the receiver to detect and recover the transmitted signal.

In particular, the time required for the receiver to recover the transmitted signal is linked to the limitation of how many slots a service can occupy in the TFS system. The present invention provides a method of increasing the efficiency of the TFS system to more freely size the service to be transmitted.

In addition, the receiver according to the present invention can operate faster and cheaper than the conventional receiver.

The present invention provides a method for reducing the hardware burden and latency of a receiver by providing a more efficient transmission technique of P1 and P2 symbols.

In addition, the new signaling provides a way for the receiver to automatically recognize the newly added TFS ensemble.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 illustrates a transmitter embodiment of a TFS system according to an embodiment of the present invention.

The data to be transmitted is classified for each service by the service composer 101 to form an FEC block and a baseband frame, interleaved, and scheduled in the TFS frame to fit the TFS frame.

The frequency divider 102 divides the transmission data for each RF channel of the TFS frame and sends them to each of the modulators 108.

Then, in each modulator, the QAM mapping unit 103 converts the data to be transmitted into a QAM signal, the interleaver 104 performs frequency and bit interleaving, and the scattered and continuous pilot inserting unit 105 for each data symbol. Insert the scattered and continuous pilot.

Then, the OFDM modulator 106 performs OFDM modulation on each data.

Finally, the pilot symbol inserter 107 constructs a pilot symbol including the P1 and P2 symbols by using the signaling information received from the service component 101 and inserts the pilot symbol.

5 illustrates a receiver of a TFS system according to an embodiment of the present invention. In order to transmit the received data, the receiver must first know the parameters of the TFS system. To this end, the front end 201 receives the RF signal, and the synchronization unit 202 synchronizes the OFDM signal by using a guard interval or the like from the received RF signal.

The synchronized signal is demodulated by the OFDM demodulator 203 using parameters of the P1 symbol determined for the detection of the P1 symbol. Thereafter, the mode detector 204 detects an FFT size, a guard interval, and the like of the P2 symbol and the data symbol.

Information such as the FFT size and the guard interval of the detected P2 symbol and the data symbol is transmitted to the OFDM demodulator 203 to perform OFDM demodulation of the remaining symbols except for the P1 symbol. In addition, the information detected by the mode detector 204 may be transmitted to the synchronizer 202 or the front end 201 to perform the synchronizer 202 or the front end 201.

Thereafter, the equalization unit 206 compensates for the distortion caused by the channel, and the TFS parameter detector 205 obtains the configuration information of the TFS frame and the configuration information of the physical layer channel from the P2 symbol or the data symbol.

The configuration information is transmitted to the front end 201 and the synchronization unit 202 to perform the appropriate RF channel change and synchronization accordingly. In addition, the service decoding unit 209 may send necessary information.

    Through this process, the receiver can obtain the configuration information of the TFS frame and locate the desired service. The physical layer data is then equalized by the equalizer 206 through pilot symbols, continuous pilots, scattered pilots, and the like, and converted by the deinterleaving unit 207 and the QAM demapping unit 208. It is decoded by the service decoding unit 209 and delivered to the desired output stream.

The role of the P1 symbol in the time-frequency slicing system is to enable the early detection of the P1 signal at the receiver, the transmission of information in the FFT size, the coarse frequency and timing synchronization, and the like. According to one embodiment of the invention, it is possible to design a new P1 that can further strengthen this role.

According to an embodiment of the present invention, the P1 symbol of the TFS frame may be configured to use every even carrier as a pilot and an odd carrier as a null carrier or an unused carrier.

Alternatively, every even carrier may be used as a null carrier and an odd carrier may be used as a pilot. Each carrier of the P1 symbol according to the present invention may be modulated with a pseudo-random sequence (PRBS) and a BPSK.

The pilot symbol according to the present invention may be referred to as an even or odd-indexed symbol compared to a conventional symbol. Pilot symbols according to the present invention have a larger number of pilot carriers and are arranged regularly than conventional pilot symbols.

6 shows an example of even-indexed pilots in accordance with an embodiment of the present invention.

The symbol structure according to the present invention uses a larger number of pilot carriers, and by using a larger number of pilot carriers, a more robust detection capability and offset estimation performance can be achieved in a frequency selective fading channel environment. I can show you. In addition, due to the regular arrangement, the receiver can perform detection of a new P1 signal by simply comparing the energy of odd and even carriers of the received signal.

In the case of coarse offset estimation, since a pilot carrier to be transmitted is modulated with PRBS, it may be performed through a correlation operation. This operation is required for determining the FFT size of P2 even in the conventional symbol structure. Through this operation, the FFT size of the P1 symbol can also be detected. Such an operation may be performed by the mode detector 204 of the receiver of FIG. 5.

Even or odd-indexed P1 according to the present invention can be applied to TFS frames in various ways.

In the first embodiment of the present invention, only the structure of the pilot symbol may be changed to the structure according to the present invention while maintaining the 1/4 guard interval length, 2k mode, which is a parameter used in the conventional frame structure. In this case, the receiver may use an FFT size of 2k to detect the P1 symbol according to the present invention. Subsequent processes may maintain their usual manner.

In the second embodiment of the present invention, the P1 symbol structure according to the present invention can be transmitted in the largest FFT size and the longest guard interval mode in the FFT size used in the time-frequency slicing system.

In this case, the receiver can also detect P1 symbols transmitted with fixed parameters accordingly. In addition, the P1 symbol thus transmitted may provide channel information for decoding the P2 symbol subsequently transmitted.

In a time-frequency slicing system, a P2 symbol is a symbol that can be transmitted by combining all FFT sizes and all guard intervals in the system as a data symbol. According to the present invention, when a P1 symbol is transmitted with the largest FFT size and the longest guard interval, the channel information is not lost for all FFT size P2 symbols even in the longest delay spread defined in the system. It can be secured.

In the conventional P1 symbol, the pilot carriers are irregularly arranged, so that it is difficult or lossy to obtain channel information. However, in the structure according to the present invention, the P1 symbol is arranged regularly so that channel information can be easily obtained.

7 shows a structure of a receiver for P2 symbol decoding according to the prior art.

Referring to FIG. 7, in order to decode a P2 symbol, the P2 pilot extracts the P2 pilot to obtain channel information through the P2 pilot, and decodes the P2 data through the equalizer 703 using the P2 pilot. Therefore, the data of P2 should be buffered in the buffer 702 and the synchronization time is delayed during the pilot extraction and channel information calculation of P2.

8 is a receiver for decoding a P2 symbol using a P1 symbol according to an embodiment of the present invention.

Unlike the conventional method, the receiver may apply the channel information obtained through P1 to the P2 to perform decoding through the equalizer 802, indicating a channel state experienced by the P2 symbol required in the conventional method. Data buffering and processing latency to obtain channel information can be reduced, which can reduce the synchronization time of the entire system.

9 shows a combination of an FFT size and a guard interval applicable to a TFS system according to the present invention. Referring to FIG. 9, the P1 symbol according to the present invention may be transmitted as a symbol having a 32K FFT size and a 1/8 guard interval.

In addition, a method in which a pilot carrier regularly transmits any P1 symbols arranged in the largest FFT size and the longest guard interval mode at the FFT size and used for channel estimation for decoding of the P2 symbols may be further buffered at the receiver. The delay of the synchronization time can be avoided.

In the third embodiment of the present invention, the P1 symbol and the conventional P2 symbol according to the present invention can be transmitted in the largest FFT size on the system and the longest guard interval mode in the FFT size.

In this case, all the advantages of the second embodiment described above can be obtained and additional advantages can be obtained. In a conventional system, FFT size information of a data symbol and a P2 symbol is transmitted in a PBS symbol in a PRBS pattern. That is, different PRBSs mean different FFT sizes, and the mode detector 204 of the receiver performs a PRBS correlation operation to determine this.

That is, in order to decode the P2 symbol, a detection operation on all PRBS patterns must be performed on the P1 symbol, and a guard interval detection operation on the data symbol and the P2 symbol is required to detect the guard period mode of the P2 symbol. This approach increases the complexity of the receiver and introduces a delay in synchronization time. In addition, further expansion of the FFT size becomes difficult.

According to the present invention, the receiver can detect and decode P1 and P2 symbols using a fixed FFT size and a guard interval that are already known without additional operations for detecting P2 symbols. In addition, the channel estimation using P1 symbols described above can be used together with the P2 decoding technique to reduce the correlation computation, data buffering, and processing latency required at the receiver.

When using this method, the channel information obtained from the P2 symbol can be used as initial channel information for the data symbol adjacent to the P2 symbol because there is no loss of information like the channel information obtained from the P1 symbol.

In an embodiment of the present invention, FFT size information of a data symbol is additionally transmitted to P2. Through this, the FFT size can be easily expanded later and the FFT size detection can be made very simple.

10 is an example of a system using P1 and P2 in accordance with one embodiment of the present invention. Compared to the structure of the conventional receiver, the mode detector 204 disappears, and the new equalizer 1001 and the TFS parameter detector 1002 signal information such as the FFT size, the guard interval, and the like of the data symbol to form a more effective system. Can be seen. At this time, the synchronization unit 1003 and the OFDM demodulation unit 1004 perform operations for data symbols according to the TFS parameter obtained after performing synchronization and operations on predetermined P1 and P2.

Referring to the combination example of the system shown in FIG. 9, in this embodiment, P1 and P2 are transmitted in symbols having a 32K FFT size and a 1/8 guard interval.

Additionally, any P1 symbol in which pilot carriers are regularly arranged may be used in this application example, and any given FFT size and guard interval may be equally applied to P1 and P2.

In a fourth embodiment according to the present invention, the P1 symbol and the P2 symbol according to the present invention may be transmitted in the same FFT size and guard interval mode as the data symbols of the system. In this case, the burden on the receiver can be reduced while having all the advantages of the above-described third embodiment.

First, the receiver can find out the FFT size while performing an operation to find the start position of the OFDM symbol. In order to find the FFT size at the same time by holding the start position of the OFDM symbol, the correlation characteristic of the guard interval can be used. By detecting the FFT size at the same time as the start position of the OFDM symbol, the PRBS decoding process of P1, which is necessary to find the FFT size, is unnecessary.

In addition, by using the channel estimation result using P1 for decoding P2, data buffering and additional latency for P2 decoding required at the receiver can be reduced. In addition, since the data symbols and the P1 and P2 symbols all use the same FFT size, the structure of the receiver is simplified and the burden of converting the mode of the FFT processor in real time is eliminated.

The receiver of FIG. 10 described above may be used to implement such an operation. However, unlike the third embodiment, since the OFDM demodulator 1004 operates only in one FFT size, guard interval mode obtained by the synchronizer 1003, the OFDM demodulator 1004 operates in a simpler form.

11 shows a TFS frame structure according to an embodiment of the present invention.

In the TFS frame structure according to the present invention, P1 and P2 symbols are distributed and arranged in a time domain unlike in the prior art. In this way, P2 symbols can obtain diversity gain in the frequency and time domain.

In addition, if the receiver fails to decode the P2 symbol, a delay occurs for one TFS frame time in the conventional structure, but in the frame structure according to the present invention, the receiver moves to the next RF channel and simultaneously obtains the P2 of the RF channel. This reduces the latency required to decode P2.

In the conventional TFS system, the P2 symbol has the same FFT size and the degree of freedom of the guard interval mode as the data symbols. In order to decode the P2 symbol at the receiver, it is necessary to extract the PRBS pattern of the P1 symbol and extract the guard interval mode from the data symbol and the P2 symbol.

The detection of P2 symbols is closely related to the synchronization delay time in the TFS system and is closely related to the performance of the system. The present invention provides an easier P2 symbol detection scheme.

In addition to the conventional P1 symbol by including the FFT size of P2 in the PRBS pattern and can be transmitted by including the guard interval mode of P2. The guard interval mode information may be carried on some of the pilot carriers of the P1 symbol. In this case, additional computation and processing latency for extracting the guard interval mode of the P2 symbol can be reduced.

12 illustrates a system using guard interval signaling of a P1 symbol according to an embodiment of the present invention. Unlike the related art, the guard interval mode obtained by the mode detector 1202 may be transmitted to the synchronizer 1201 to quickly detect and decode P2 and data symbols.

In another embodiment, the FFT size or guard interval mode may be fixed and transmitted in a predetermined combination. In this case, it is easy to detect in the receiver and can take advantage of the combination with P1 described above. This is the same as the application example of FIG.

In addition, the P2 symbol is composed of several OFDM symbols or one OFDM symbol of 16K and 32K FFT sizes, and the number of symbols can be added according to the required information amount. At this time, the information in P2 is encoded with an error correction code and interleaved in the entire P2 symbol to secure robustness against impulse noise.

Therefore, to deinterleave P2 symbols at the receiver, the number of OFDM symbols in the P2 symbols must be known. To this end, the number of OFDM symbols constituting the P2 symbol may be transmitted to the first OFDM symbol of the P1 symbol or the P2 symbol. To this end, OFDM symbol number information constituting the P2 symbol may be carried on a specific carrier of the P1 or P2 symbol.

TFS systems, on the other hand, use a plurality of allocated RF channels and transmission times for service multiplexing. Each service occupies as many TFS system slots as are allocated by the service multiplexer. In order to restore the service again in the receiver, information indicating the location and size of each service is transmitted in a P2 symbol. At this time, the location of each service is transmitted in an OFDM cell, that is, a carrier unit.

In the present invention, a frame structure for efficiently locating a service, that is, a data symbol, in a TFS system is presented.

To find the location of an OFDM symbol with the location of the service transmitted in the P2 symbol, the number of the OFDM symbol must be known. Therefore, if the OFDM symbol number in one frame is transmitted to each OFDM symbol, the receiver can efficiently locate the service.

In a TFS system, a receiver may periodically change an RF channel to receive a service. In this case, since the time for the receiver to change the RF channel is variable, the number of OFDM symbols that pass while the RF channel is changed is also variable. Therefore, if the receiver knows the number of symbols in the frame after changing the RF channel, the current position can be known regardless of the RF channel change time, and the position of the desired service can be easily calculated.

In addition, in the conventional TFS system, a scattered pilot is inserted into a data symbol to extract a channel experienced by the data symbol. However, this scattered pilot has a different form periodically as shown in FIG. Therefore, in order for the receiver to perform channel estimation for data symbol decoding using the scattered pilot, the receiver must know the position of the scattered pilot. In this case, if the receiver knows the OFDM symbol number, it is easy to find the location of the scattered pilot using only that number.

Therefore, the OFDM symbol numbering scheme according to the present invention is a method for the receiver to eliminate the scattered pilot position extraction for decoding the data symbols, additional operations required for the position extraction of the service.

14 is an example of a receiver that may be used in a conventional TFS system.

The time detector 1401 detects the time actually passed to obtain a desired service position after the RF channel is changed, and the address detector 1402 obtains the symbol number of OFDM through the above time and finds the address of the service. Only the desired service can be obtained from the parser 1403. However, it is difficult to detect the time passed in practical applications.

15 illustrates a structure of a receiver that can be used in a method of finding an address of a service by obtaining an OFDM number from a data symbol according to an embodiment of the present invention.

The OFDM symbol number detection unit 1501 obtains an OFDM symbol number through the numbering information of the data symbols passed through the equalizer 206, and the address detection unit 1502 finds an address of a service through the number, and symbol symbol parser. At 1503, only the desired service can be obtained.

Various methods may be used for OFDM symbol numbering. In the simplest case, a specific carrier of a data symbol may be allocated and used as OFDM symbol numbering.

There is signaling of a part related to layer information L1 among signaling used in TFS. This includes the FFT size, the guard interval mode, and the number of physical layer channels for the service being transmitted in the TFS frame. In addition, the information of various physical layer and service layer can be transmitted through L1 signaling. The above-described type of information does not need to be transmitted every TFS frame and is not changed very much and can be referred to as static layer information (L1 static). .

As shown in Figs. 16A and 16B, version information for determining whether channel information and layer information used by the TFS ensemble has been updated may be added to the static layer information. In addition, the FFT size being used may be added.

According to an embodiment of the present invention, channel information used by the TFS ensemble may be included in a field named next_tfs_ensemble, and whether layer information is updated may be included in a field called L1_sat_ver. The FFT size may be included in the fft_size field.

Multiple TFS ensembles may exist simultaneously using different RF channels. In this case, the receiver must scan all the frequencies available to TFS, such as UHF / VHF, to find these multiple TFS services. This is very time consuming and inefficient.

According to one embodiment of the present invention, if one TFS ensemble is found, the RF channel of the next TFS ensemble is displayed therein, so that it is not necessary to search all RF regions.

In addition, as shown in FIG. 17, if a new TFS channel is added, the content of next_tfs_ensemble is changed. In this case, the value of L1_stat_ver can be updated and stored. This allows the receiver to automatically recognize the newly added TFS ensemble.

1 shows the distribution of services on an RF channel in a conventional time frequency slicing system.

2 shows a distribution of a carrier for a conventional P1 symbol.

3 shows a distribution of information on a frame of L1 information in conventional P2.

4 illustrates a transmitter embodiment of a TFS system according to an embodiment of the present invention.

5 illustrates a receiver of a TFS system according to an embodiment of the present invention.

6 shows an example of even-indexed pilots in accordance with an embodiment of the present invention.

7 shows a structure of a receiver for P2 symbol decoding according to the prior art.

8 is a receiver for decoding a P2 symbol using a P1 symbol according to an embodiment of the present invention.

9 shows a combination of an FFT size and a guard interval applicable to a TFS system according to the present invention.

10 is an example of a system using P1 and P2 in accordance with one embodiment of the present invention.

11 shows a TFS frame structure according to an embodiment of the present invention.

12 illustrates a system using guard interval signaling of a P1 symbol according to an embodiment of the present invention.

13 shows the distribution of scattered pilots in a TFS system.

14 shows an example of a receiver that can be used in a conventional TFS system.

15 shows a structure of a receiver according to an embodiment of the present invention.

16A and 16B illustrate information included in static layer information according to an embodiment of the present invention.

17 illustrates a structure of a TFS ensemble according to an embodiment of the present invention.

Claims (14)

Receiving an RF signal comprising a data symbol comprising service data, a first pilot symbol comprising information for identifying a frame for a time frequency slicing system, and a second pilot symbol comprising information for accessing the data symbol Receiving unit; A synchronizer configured to detect and compensate for synchronization of the received RF signal; A symbol demodulator for demodulating the first pilot, the second pilot, and the data symbol; An equalizer for compensating for channel distortion of the RF signal; A parameter detector configured to extract configuration information from a second pilot symbol and a data symbol among the distortion compensated signals; And Decoding unit for decoding the physical layer information of the distortion-compensated signal, And the conversion parameters of the first pilot symbol and the second pilot symbol are the same as the conversion parameters of the data symbols. The method of claim 1, And the synchronization unit detects an FFT size of the symbols by applying a correlation operation to a guard interval of any one of the symbols. The method of claim 2, And the symbol demodulator demodulates the symbols based on the FFT size and guard interval length of the detected symbol. A method of decoding a signal of a time and frequency slicing system, Receiving an RF signal comprising a data symbol comprising service data, a first pilot symbol comprising information for identifying a frame for a time frequency slicing system, and a second pilot symbol comprising information for accessing the data symbol Doing; Detecting and compensating for synchronization of the received RF signal; Demodulating the first pilot, the second pilot, and the data symbol; Compensating for channel distortion of the RF signal; Extracting configuration information from a second pilot symbol and a data symbol of the distortion compensated signal; And Decoding physical layer information among the distortion compensated signals; The conversion parameter of the first pilot symbol and the second pilot symbol is the same as the conversion parameter of the data symbol. The method of claim 4, wherein Detecting and compensating for the synchronization, And detecting a FFT size of the symbols by applying a correlation operation to the guard interval of any one of the symbols. The method of claim 4, wherein And demodulating the first pilot symbol, the second pilot symbol, and the data symbol based on the FFT size and guard interval length obtained from any one of the symbols. A storage medium for storing frames for a time frequency slicing system, A data symbol containing service data; A first pilot symbol comprising information for identifying a frame for a time frequency slicing system; And A second pilot symbol comprising information for accessing the data symbol, The conversion parameters of the first pilot symbol and the second pilot symbol store the same frame structure as the conversion parameter of the data symbol. The method of claim 7, wherein The symbols are converted by the FFT size and the longest guard interval of the available FFT size. Classifies data including a plurality of services by service, and includes a data symbol including the service data, a first pilot symbol that identifies a frame for a time frequency slicing system, and information for accessing the data symbol. A service constructing unit converting the second pilot symbols to form a transmission frame; A frequency divider for dividing the transmission frame into RF channels; And It includes a modulator for modulating the separated data, And the conversion parameters of the first pilot symbol and the second pilot symbol are the same as the conversion parameters of the data symbols. Receiving an RF signal comprising a data symbol comprising service data, a first pilot symbol comprising information for identifying a frame for a time frequency slicing system, and a second pilot symbol comprising information for accessing the data symbol Receiving unit; A synchronizer configured to detect and compensate for synchronization of the received RF signal; A symbol demodulator for demodulating the first pilot, the second pilot, and the data symbol; An equalizer for compensating for channel distortion of the RF signal; A parameter detector configured to extract configuration information from a second pilot symbol and a data symbol among the distortion compensated signals; And Decoding unit for decoding the physical layer information of the distortion-compensated signal, And the first pilot symbol and the second pilot symbol are distributed at predetermined intervals in a time direction for each frequency. Classifies data including a plurality of services by service, and includes a data symbol including the service data, a first pilot symbol that identifies a frame for a time frequency slicing system, and information for accessing the data symbol. A service constructing unit converting the second pilot symbols to form a transmission frame; A frequency divider for dividing the transmission frame into RF channels; And It includes a modulator for modulating the separated data, And the conversion parameters of the first pilot symbol and the second pilot symbol are distributed at predetermined intervals in a time direction for each frequency. A storage medium for storing frames for a time frequency slicing system, A data symbol containing service data; A first pilot symbol comprising information for identifying a frame for a time frequency slicing system; And A second pilot symbol comprising information for accessing the data symbol, And the first pilot symbol and the second pilot symbol are distributed at predetermined intervals in a time direction for each frequency. A storage medium for storing an ensemble constituting a frame for a time frequency slicing system, A data symbol containing service data; A first pilot symbol comprising information for identifying a frame for a time frequency slicing system; And A second pilot symbol comprising information for accessing the data symbol, The second pilot symbol includes layer information for accessing information of a physical layer, the layer information includes static information that does not change for each frame, and the static information includes channel information through which a next ensemble is transmitted and the layer information. Storage medium containing version information. The method of claim 13, The static information further comprises FFT size information of the second pilot symbol.

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