KR102097543B1 - Transmitter, receiver and controlling method thereof - Google Patents

Abstract

The transmitting device is started. The transmitting apparatus includes a preamble symbol inserting unit for inserting a preamble symbol including a synchronization part and an information part into a frame, and a transmitter for transmitting a frame including a preamble symbol, and the synchronization part is a frequency offset It includes a plurality of first sequences for measuring, and the information part includes a plurality of second sequences for measuring the amount of phase change of the information part. Accordingly, the reception apparatus can accurately detect the preamble symbol based on the same plurality of sequences inserted in the preamble symbol, the complexity of the configuration of the reception apparatus is reduced, and the data transmission rate is also increased.

Description

A transmitting device, a receiving device, and a control method thereof {TRANSMITTER, RECEIVER AND CONTROLLING METHOD THEREOF}

The present invention relates to a transmitting device, a receiving device and a control method thereof, and more particularly, to a transmitting device, a receiving device using the OFDM method, and a control method thereof.

DVB-T2 (Digital Video Broadcasting the Second Generation Terrestrial) is a second-generation European terrestrial digital broadcasting standard that improves the performance of DVB-T in service by adopting it as a standard in more than 35 countries around the world, including Europe. -T2 realized the increase of transmission capacity and high bandwidth efficiency by applying the latest technologies such as LDPC (Low Density Parity Check) code and 256QAM modulation method, and accordingly, can provide various high quality services such as HDTV in a limited band. It has the advantage.

Meanwhile, T2-FRAME currently used in DVB-T2 is composed of a P1 preamble symbol, a P2 preamble symbol, and a data symbol. The P1 preamble symbol is used to perform synchronization and a function of transmitting signaling data. The P1 preamble symbol is detected, synchronization is performed using the detected P1 preamble symbol, frequency offset is compensated, and signaling data is received.

However, the process of detecting the P1 preamble symbol is performed using a guard interval in the P1 preamble symbol. If the detection process is performed based on the data, it is difficult to accurately find the starting point of the preamble within 1 sample.

Accordingly, a method using a preamble symbol using a Zadoff-Chu sequence has been developed to accurately find the starting point of a preamble within 1 sample.

1 is a view for explaining the prior art. Specifically, the synchronization signal is composed of eight Zadoff-Chu sequences (110). Since five of the eight Zadoff-Chu sequences are used to transmit synchronization signals, only three sequences 120 can be loaded with data and transmitted. .

In addition, since the receiving device stores a plurality of sequences, and detects a preamble symbol based on the output correlated with each received Zadoff-Chu sequence, the configuration of such a receiving device is complicated and it is difficult to transmit a large amount of data. There was a problem.

Accordingly, there is a need to increase the amount of information transmitted in the preamble symbol and to improve the preamble detection performance in the receiving device while reducing the complexity of the configuration of the receiving device.

An object of the present invention is to provide a transmission apparatus, a reception apparatus and a control method thereof using preamble symbols including the same plurality of sequences.

The transmission apparatus according to an embodiment of the present invention for achieving the above object is a preamble symbol inserting unit and the preamble symbol for inserting a preamble symbol including a synchronization part and an information part into a frame. It includes a transmitting unit for transmitting a frame, the synchronization part includes a plurality of first sequences for measuring the frequency offset, the information part is a plurality of second sequences for measuring the amount of phase change of the information part It includes.

Here, each of the plurality of first sequences is the same as each other, and the signals related to the amount of phase change of the information part are respectively mapped to the plurality of second sequences, and the amount of phase change is an adjacent first among the plurality of second sequences. It is the amount of phase change between 2 sequences.

In addition, the signal related to the phase change amount is a signal modulated using a DBPSK (Differential Binary Phase Shift Keying) method.

Meanwhile, the plurality of first sequences and the plurality of second sequences are Zadoff-Chu sequences.

Here, the plurality of first sequences and the plurality of second sequences may be obtained by multiplying the same Zadoff-Chu sequence by a phase value of 0 degrees and a phase value of 180 degrees.

The reception apparatus according to an embodiment of the present invention includes a reception unit that receives a frame including a preamble symbol including a synchronization part and an information part, and a plurality of consecutive sequences of the synchronization part and the information part Detecting the preamble symbol based on, measuring a frequency offset based on a plurality of first sequences included in the synchronization part, and amount of phase change of the information part based on a plurality of second sequences included in the information part And a preamble symbol detector configured to detect signaling data of the preamble symbol based on the frequency offset and the phase change amount.

Here, the preamble symbol detection unit may sequentially compare each sequence while sequentially delaying the plurality of first sequences and the plurality of second sequences to measure the amount of frequency offset and phase change.

In addition, the preamble symbol detection unit may determine that the preamble symbol exists in a position corresponding to the largest value calculated by multiplying all of the delayed correlator output values in the length of each sequence in the frame. .

On the other hand, each of the plurality of first sequences is the same as each other, and the signals related to the amount of phase change of the information part are respectively mapped to the plurality of second sequences, and the amount of phase change is an adjacent first among the plurality of second sequences. It is the amount of phase change between 2 sequences.

In addition, the signal related to the phase change amount is a signal modulated using a DBPSK (Differential Binary Phase Shift Keying) method.

In addition, the plurality of first sequences and the plurality of second sequences are Zadoff-Chu sequences.

Here, the plurality of first sequences and the plurality of second sequences may be obtained by multiplying the same Zadoff-Chu sequence by a phase value of 0 degrees and a phase value of 180 degrees.

Meanwhile, a method of controlling a transmission apparatus according to an embodiment of the present invention includes inserting a preamble symbol including a synchronization part and an information part into a frame and transmitting a frame including the preamble symbol The synchronization part includes a plurality of first sequences for measuring a frequency offset, and the information part includes a plurality of second sequences for measuring a phase change amount of the information part.

Here, each of the plurality of first sequences is the same as each other, and the signals related to the amount of phase change of the information part are respectively mapped to the plurality of second sequences, and the amount of phase change is an adjacent first among the plurality of second sequences. It is the amount of phase change between 2 sequences.

In addition, the signal related to the phase change amount is a signal modulated using a DBPSK (Differential Binary Phase Shift Keying) method.

In addition, the plurality of first sequences and the plurality of second sequences are Zadoff-Chu sequences.

Here, the plurality of first sequences and the plurality of second sequences may be obtained by multiplying the same Zadoff-Chu sequence by a phase value of 0 degrees and a phase value of 180 degrees.

On the other hand, the control method of the receiving apparatus according to an embodiment of the present invention comprises the steps of receiving a frame including a preamble symbol including a synchronization part and an information part, the synchronization part and the information part The preamble symbol is detected based on a plurality of consecutive sequences, the frequency offset is measured based on a plurality of first sequences included in the synchronization part, and the number is determined based on a plurality of second sequences included in the information part. And measuring a phase change amount of the information part and detecting signaling data of the preamble symbol based on the frequency offset and the phase change amount.

Here, the measuring step may compare the respective sequences successively while sequentially delaying the plurality of first sequences and the plurality of second sequences to measure the amount of frequency offset and phase change.

And, in the detecting step, it may be determined that the preamble symbol exists in a position corresponding to the largest value calculated by multiplying all the output values of the correlators delayed in units of lengths of each sequence in the frame. .

In addition, each of the plurality of first sequences is the same as each other, and the signals related to the amount of phase change of the information part are respectively mapped to the plurality of second sequences, and the amount of phase change is an adjacent first among the plurality of second sequences. It is the amount of phase change between 2 sequences.

On the other hand, the signal related to the phase change amount is a signal modulated using a DBPSK (Differential Binary Phase Shift Keying) method.

In addition, the plurality of first sequences and the plurality of second sequences are Zadoff-Chu sequences.

Here, the plurality of first sequences and the plurality of second sequences may be obtained by multiplying the same Zadoff-Chu sequence by a phase value of 0 degrees and a phase value of 180 degrees.

As described above, according to various embodiments of the present invention, the receiving apparatus can accurately detect the preamble symbol based on the same plurality of sequences inserted in the preamble symbol, the complexity of the configuration of the receiving apparatus is reduced, and the data transmission rate is also increased. Is done.

1 is a view for explaining the prior art.
2 is a block diagram showing the configuration of a transmission apparatus according to an embodiment of the present invention.
3 is a diagram for a T2 frame structure according to an embodiment of the present invention.
4 is a diagram of a transmitter generating a T2 signal using the DVB-T2 method.
5 is a diagram showing the configuration of a preamble symbol according to an embodiment of the present invention.
6 is a view showing a phase change reflected by the influence of a frequency offset according to an embodiment of the present invention.
7 is a block diagram showing the configuration of a receiving device according to an embodiment of the present invention.
8 is a view showing in detail the configuration of a receiving device according to an embodiment of the present invention.
9 is a view for explaining a method of detecting a preamble symbol according to an embodiment of the present invention.
10 is a flowchart illustrating a control method of a transmitting apparatus according to an embodiment of the present invention.
11 is a flowchart illustrating a method of controlling a receiving device according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

2 is a block diagram showing the configuration of a transmission apparatus according to an embodiment of the present invention.

According to FIG. 2, the transmission device 200 includes a preamble symbol insertion unit 210 and a transmission unit 220.

Here, the preamble symbol inserter 210 may insert a preamble symbol including a synchronization part and an information part into a frame.

Then, the transmitter 220 may transmit a frame including a preamble symbol.

Here, the preamble symbol may be used to synchronize the frames by notifying the start point of the frame, and the transmitting device 200 may transmit the frame according to the DVB-T2 method, wherein the data is transmitted using the DVB-T2 method. The unit to be transmitted is called a T2 frame.

Accordingly, the T2 frame structure will be described in detail.

3 is a diagram for a T2 frame structure according to an embodiment of the present invention.

Referring to FIG. 3, a plurality of T2 frame structures in a time domain of DVB-T2 is illustrated, and one T2 frame 310 indicates P1 preamble symbols 320 and L1 (Layer 1) indicating the start position of the frame. It may be composed of a P2 preamble symbol 330 for transmitting a signal and data symbols 340 for transmitting a broadcast signal.

Specifically, the P1 preamble symbol 320 is located at the first part of the T2 frame 310 and can be used to detect the starting point of the T2 frame 310. In addition, the P1 preamble symbol 310 uses a 1K FFT size and is a guard interval type signal. In addition, the P1 preamble symbol 320 in the frequency domain uses 384 subcarriers from 853 subcarriers among 1K FFTs and can transmit 7 bits of information.

4 is a diagram of a transmitter generating a T2 signal using the DVB-T2 method.

The transmitter 400 that generates a T2 signal using the DVB-T2 method includes an input stream processor 410, a BICM 420, a frame mapper 430, an OFDM generator 440, and a preamble generator 450. do.

The input stream processor 410 may process to generate a baseband frame format signal from the input broadcast signal.

In addition, the BICM (Bit-Interleaved Coded Modulation) operation unit 420 encodes the input baseband frame format signal by LDPC, and the encoded signal can be modulated.

Here, in the DVB-T2 method, there are LDPC codes of 64800 bits and 16400 bits in length, and the input signals can be encoded by various code rates. Meanwhile, the coded signal may be modulated into QPSK (Quadrature Phase Shift Keying), 16 QAM (Quadrature Amplitude Modulation), 64 QAM, and 256 QAM.

In addition, the frame mapper 430 may generate a T2 frame structure for OFDM transmission. Here, the T2 frame structure is composed of a data subcarrier for transmitting a modulated signal, a pilot for channel estimation, and a subcarrier (or reserved tone) for reducing peak to average power ratio (PAPR). You can.

Meanwhile, the OFDM generation unit 440 may convert a signal input from the frame mapper 230 into a time domain signal using an Inverse Fast Fourier Transform (IFFT) method that converts a frequency domain signal to a time domain signal. have.

In addition, the preamble generator 450 may generate a transmission signal by adding a preamble to the beginning of the T2 frame for T2 frame synchronization.

Meanwhile, the preamble symbol insertion unit 210 according to an embodiment of the present invention may correspond to the preamble generation unit 450 of the transmitter using the above-described DVB-T2 method.

Referring to FIG. 2 again, as described above, the transmission apparatus 200 may transmit a frame including a P1 preamble symbol. Hereinafter, the P1 preamble symbol will be described as a preamble symbol.

Here, the preamble symbol may include a synchronization part and an information part.

Specifically, the synchronization part may include a plurality of first sequences for measuring the frequency offset, and the information part may include a plurality of second sequences for measuring the amount of phase change of the information part.

The synchronization part is a part used to measure frequency offset in accurately detecting signaling data of a preamble symbol. The Zadoff-Chu sequence is represented by time delay and phase shift of the output value of the correlator when a frequency offset is present.

Here, the phase shift appears with a constant magnitude value according to the position where the sequence exists. This will be explained in more detail.

6 is a view showing a phase change reflected by the influence of a frequency offset according to an embodiment of the present invention.

According to FIG. 6, the horizontal axis represents the frequency axis and the vertical axis represents the phase value, and a total of eight peaks 610 are illustrated, and it can be seen that each peak 610 has a different phase value. Here, the reason each peak value 610 has a different phase value is because of the influence of the frequency offset.

In addition, it can be seen that the phase values corresponding to each peak value 610 are linearly changed.

Therefore, the difference between the phase value due to the frequency offset of the second peak and the phase value due to the frequency offset of the third peak and the difference between the phase value due to the frequency offset of the second peak It can be seen that it is the same. For example, if there are a total of eight peak values x0, x1, x2, x3, x4, x5, x6, and x7, the phase values corresponding to each peak are z, 2 * z, 3 * z, 4 * z, 5 * z, 6 * z, 7 * z, 8 * z. This is because, as previously described, the phase values corresponding to each peak are changed linearly.

Accordingly, the difference between the phase values corresponding to x1 and x0 becomes z, the difference between the phase values corresponding to x2 and x1 becomes z, the difference between the phase values corresponding to x3 and x2, and the difference between x4 and x3 It can be seen that both of the phase values are z.

That is, as described above, the difference between the phase values corresponding to two consecutive peaks is the difference between the frequency offset values affecting the phase of each peak, and thus the frequency offset value that is the difference between the phase values of two consecutive peaks. They are all the same.

Accordingly, after summing the phase values of two paired peaks, and subtracting the equally added frequency offset value, it is possible to grasp the phase change of the peaks excluding the effect of the frequency offset.

Accordingly, the receiving apparatus 700 can calculate the phase values between all sequences only by knowing the phase offset between the frequency offset and the adjacent sequence, and detect signaling data from the preamble symbol based on the calculated phase values.

Meanwhile, a configuration of a preamble symbol for measuring a phase change between a frequency offset and an adjacent sequence will be described in detail.

As described above, the synchronization part included in the preamble symbol includes a plurality of first sequences for measuring frequency offset, and the information part includes a plurality of second sequences for measuring the amount of phase change of the information part, wherein , Each of the plurality of first sequences is identical to each other, and signals relating to the amount of phase change of the information part are respectively mapped to the plurality of second sequences.

And, the phase change amount means a phase change amount between adjacent second sequences among a plurality of second sequences.

In addition, as an example, since the plurality of first sequences is for measuring the frequency offset, even if there are only two first sequences, the frequency offset can be measured based on this.

5 is a diagram showing the configuration of a preamble symbol according to an embodiment of the present invention.

According to FIG. 5, the preamble symbol may include a synchronization part 510 and an information part 520.

In addition, the synchronization part 510 includes two identical sequences 511 and 512, and the information part 520 may include other sequences 521, 522, and 523 randomly mixed.

Here, the reason why two identical sequences 511 and 512 are included in the synchronization part 510 is to measure the frequency offset based on the same sequence 511 and 512. That is, since the same sequences 511 and 512 have the same phase, if there is a phase difference, this is due to the frequency offset.

In addition, signals relating to the amount of phase change of the information part are mapped to a plurality of different sequences 521, 522, and 523 included in the information part 520, respectively. Here, the phase change amount is a phase change amount between adjacent sequences among a plurality of different sequences 521, 522, and 523.

For example, assuming that the sequence in which the phase of Sequence 0 is changed by 180 degrees is Sequence 1, Sequence 0 and Sequence 1 are 180 degrees out of phase with each other.

Accordingly, since the two sequences 0 (511, 512) included in the synchronization part 510 have the same phase, it is possible to measure the frequency offset based on this.

And, the three sequences 521, 522, and 523 included in the information part 520 are composed of sequence 1, sequence 1, and sequence 0, and the sequence 1 521 disposed at the beginning of the information part 520 is The phase difference between the second placed sequence 0 522 of the synchronization part 510 is 180 degrees, and the second placed sequence 1 522 of the information part 520 is the same as the previous sequence 1 521 Therefore, the phase difference is 0 degrees.

In addition, the third sequence 0 523 arranged in the information part 520 is 180 degrees out of phase with the second sequence 0 522.

That is, the amount of phase change of the information part 520 means the amount of phase change with a previous sequence between adjacent sequences among a plurality of sequences included in the information part 520.

Meanwhile, the signals related to the calculated amount of phase change may be mapped to a plurality of sequences included in the information part 520, respectively.

Specifically, the signal related to the phase change amount may be a signal modulated using a DBPSK (Differential Binary Phase Shift Keying) method. Here, the DBPSK method means a phase modulation method that shifts to two phases by performing a logical sum of binary codes at the transmitting device side, and is standardized (IEEE 802.11) for use as a baseband modulation method in a wireless LAN. Used in spectrum (DS-SS) method.

For example, if a binary code, which is a logical sum of codes to be transmitted, is transmitted and shifted by the transmitting device on the in-phase and inverse phase of the carrier, the receiving device converts the logical difference after the demodulation process to restore the original pulse. .

Accordingly, the amount of phase change between the sequence 1 521 arranged at the beginning of the information part 520 and the sequence 0 522 arranged at the second time of the synchronization part 510 is binary-coded by the DBPSK method, and the DBPSK 1 bit ( 521-1) and mapped to sequence 1 521 disposed at the beginning of the information part 520.

Then, the amount of phase change between the second arranged sequence 1 522 and the previous sequence 1 521 of the information part 520 is binary encoded by the DBPSK method and stored as DBPSK 2 bits (522-1), thereby storing the information part 520 ) To the second arranged sequence 1 (522).

In addition, the amount of phase change between the sequence 0 523 arranged in the third and the sequence 0 522 arranged in the second in the information part 520 is binary encoded by the DBPSK method and stored as DBPSK 3 bits (523-1). It is mapped to the third arranged sequence 0 523 of the information part 520.

On the other hand, in FIG. 5, it has been exemplified that the information part 520 includes three sequences, but this is only an example and may include a larger number of sequences.

As described above, the preamble symbol inserting unit 210 inserts a preamble symbol including the synchronization part 510 and the information part 520 into the frame, where the same sequence 511 included in the synchronization part 510 , 512) is for measuring the frequency offset, and a plurality of different sequences 521, 522, and 523 included in the information part 520 are for measuring the phase change amount of the information part 520.

The process of finding the original signal phase based on the frequency offset and the phase change amount will be described later.

Meanwhile, the plurality of first sequences and the plurality of second sequences may be Zadoff-Chu sequences. Here, since the chopped-off sequence has a constant signal level (constant envelop) in the time and frequency domains, it has good peak to average power ratio (hereinafter referred to as PAPR) characteristics, but excellent channel estimation in the frequency domain It shows performance.

In addition, the Chengdorf weight sequence has a characteristic in which circular autocorrelation for a non-zero shift is 0. Accordingly, terminal devices that transmit control information using the same W-Dop weight sequence can be distinguished by making cyclic shift values of the W-Dop weight sequence different from each other.

That is, the Köddorf weight sequence may be used to calculate different correlation values in the same or different cases.

Accordingly, by inserting the V-Dop weight sequence into the preamble symbol according to an embodiment of the present invention, two identical V-Dop weight sequences 511 and 512 included in the synchronization part 510 are used to measure the frequency offset. , A plurality of Wöfdorf weight sequences 521, 522, and 523 included in the information part 520 may be used to measure phase change based on a correlation between the Wofdorf weight sequences adjacent to each other.

Meanwhile, according to an embodiment, the plurality of first sequences and the plurality of second sequences may be obtained by multiplying the same Zadoff-Chu sequence by a phase value of 0 degrees and a phase value of 180 degrees.

7 is a block diagram showing the configuration of a receiving device according to an embodiment of the present invention.

According to FIG. 7, the reception device 700 may include a reception unit 710 and a preamble symbol detection unit 720.

The receiving device 700 may be, for example, a broadcasting signal receiving device to which the DVB-T2 method is applied. The broadcast signal receiving apparatus to which the DVB-T2 method is applied is composed of a preamble detector (not shown), an OFDM demodulator (not shown), a frame demapper (not shown), a BICM decoder (not shown), and a stream generator (not shown). You can.

Briefly for each configuration, preamble symbols transmitted from a plurality of antennas are transmitted in a frequency division multiplexing method, and a preamble detector (not shown) can distinguish preamble symbols transmitted through a plurality of antennas.

Also, an OFDM demodulator (not shown) may perform OFDM demodulation and a frame demapper (not shown) may generate an encoded signal to be received.

Also, the BICM decoder (not shown) may decode the received signal, and the stream generator (not shown) may generate a broadcast signal based on the decoded signal.

Here, the preamble symbol detection unit 720 according to an embodiment of the present invention may be applied to a preamble detection unit (not shown) of a broadcast signal receiving apparatus to which the DVB-T2 method is applied.

Meanwhile, the reception unit 710 may receive a frame including a preamble symbol including a synchronization part and an information part.

In addition, the preamble symbol detector 720 delays in units of length of each sequence in a frame based on a plurality of sequences included in the synchronization part and the information part, and multiplies the output values of the correlators to the largest value calculated. It can be determined that a preamble symbol exists at a corresponding position.

In addition, the preamble symbol detector 720 measures the frequency offset based on the plurality of first sequences included in the synchronization part, and measures the frequency of the phase change of the information parts based on the plurality of second sequences included in the information part. The signaling data of the preamble symbol can be detected based on the offset and the phase change amount.

As described in FIG. 5, the preamble symbol detector 720 may measure the frequency offset based on two identical sequences 511 and 512 included in the synchronization part 510 of the received preamble symbol.

That is, since two identical sequences 511 and 512 have the same phase, the preamble symbol detection unit 720 can measure the frequency offset based on this.

Further, the preamble symbol detector 720 may measure the amount of phase change of the information part 520 based on the plurality of sequences 521, 522, and 523 included in the information part 520 of the received preamble symbol.

Here, the preamble symbol detector 720 may measure the phase change based on the signal related to the phase change amount of the information part 520 mapped to each of the plurality of sequences 521, 522, and 523.

In addition, the preamble symbol detector 720 may detect signaling data of the preamble symbol based on the measured frequency offset and phase change amount, which will be described in detail.

Specifically, the preamble symbol detector 720 may sequentially compare each sequence while measuring a plurality of first sequences and a plurality of second sequences to measure frequency offset and phase change amount. A method of measuring frequency offset and phase change by sequentially comparing each sequence while sequentially delaying a plurality of sequences will be described in detail with reference to FIG. 8.

8 is a view showing in detail the configuration of a receiving device according to an embodiment of the present invention.

According to FIG. 8, the preamble symbol detection unit 720 may be configured as a detector that detects a phase change by delaying the output of the Schöndorf weight sequence correlator and the correlator in units of the length of the sequence.

Here, the reception unit 710 receives a preamble symbol including five Chengdorf weight sequences shown in FIG. 5 (511, 512, 521, 522, 523), and the preamble symbol detection unit 720 is configured to receive the preamble symbol. The frequency offset 840 may be detected based on the two Wydorf weight sequences 511 and 512 included in the synchronization part 510.

In addition, the preamble symbol detection unit 720 receives the received 5 추 -doped weight sequences (511, 512, 521, 522, 523) from the 쟤 -doped weight sequence 523 disposed at the rightmost side of the information part 520. The weight sequence correlator output can be delayed sequentially.

The preamble symbol detection unit 720 correlates the received 5 쟤 dope weight sequences (511, 512, 521, 522, 523) with the 쟤 dope weight sequence stored in the receiving device 700, and sequentially delays adjacent 쟤 dope The phase change (810, 820, 830) between the weight sequence can be detected. Here, the phase changes 810, 820, and 830 between the detected Wödorf weight sequences mean the phase changes of the information part 520.

In addition, the preamble symbol detector 720 may sequentially subtract and store the frequency offsets 840 detected from the phase changes 810, 820, and 830 between adjacent chopped weight sequences detected while sequentially delaying.

Meanwhile, the preamble symbol detector 720 may detect the preamble symbol based on a plurality of consecutive sequences of the synchronization part and the information part.

Specifically, the preamble symbol detector 720 multiplies the output value of the correlator delayed in units of the length of the sequence by using the characteristic that the output value of the correlator of the continuous Wdorfoff sequence is constant in units of the length of the sequence. It may be determined that a preamble symbol exists at a position corresponding to the largest value calculated.

On the other hand, in FIG. 8, as shown in FIG. 5, there are four modules for measuring a phase change by delaying a preamble symbol including five 쟤 -doped weight sequences as an example, but the present invention is not limited thereto. In the case of a preamble symbol including a weight sequence, the number of modules for measuring a phase change by delay is increased accordingly.

9 is a view for explaining a method of detecting a preamble symbol according to an embodiment of the present invention.

Referring to FIG. 9, the preamble symbol detector 720 may detect a frequency offset based on two identical sequences 0 (1010, 1020) included in the received preamble symbol 1000.

In addition, the preamble symbol detector 720 may measure the amount of phase change based on the plurality of sequences 1030, 1040, and 1050. The sequence 0 (1020) and the sequence 1 (1030) disposed next are 180 degrees. It is possible to measure the presence, and the sequence 1 (1030) and the sequence 1 (1040) disposed next can measure the phase change of 0 degrees, the sequence 1 (1040) and the sequence 0 (1050) disposed next ) Can measure that there is a phase change of 180 degrees.

Also, the preamble symbol detector 720 may detect the preamble symbol based on a plurality of consecutive sequences of the synchronization part and the information part.

On the other hand, the preamble symbol detector 720 can measure the frequency offset only if there are two identical sequences, and accurately calculate the phase change by reflecting the measured frequency offset, so that the sequence for synchronizing within the frame occupies The ratio decreases. Accordingly, the rate at which data can be transmitted is increased, and accordingly, the data transmission rate can be increased.

In addition, since the reception device 700 can detect and restore all signals only if it has one sequence, the structure of the reception device 700 can be simplified.

10 is a flowchart illustrating a control method of a transmitting apparatus according to an embodiment of the present invention.

According to the method illustrated in FIG. 10, a preamble symbol including a synchronization part and an information part can be inserted into a frame (S1110).

Then, a frame including a preamble symbol may be transmitted (S1120).

Here, the synchronization part may include a plurality of first sequences for measuring the frequency offset, and the information part may include a plurality of second sequences for measuring the amount of phase change of the information part.

Further, each of the plurality of first sequences is identical to each other, and signals related to the amount of phase change of the information part are respectively mapped to the plurality of second sequences, and the amount of phase change is the amount of phase change between adjacent second sequences among the plurality of second sequences. Can be

Here, the signal related to the amount of phase change may be a signal modulated using a DBPSK (Differential Binary Phase Shift Keying) method.

Also, the plurality of first sequences and the plurality of second sequences may be Zadoff-Chu sequences.

Here, the plurality of first sequences and the plurality of second sequences may be obtained by multiplying the same Zadoff-Chu sequence by a phase value of 0 degrees and a phase value of 180 degrees.

11 is a flowchart illustrating a method of controlling a receiving device according to an embodiment of the present invention.

According to the method illustrated in FIG. 11, a frame including a preamble symbol including a synchronization part and an information part is received, and the preamble is based on a plurality of consecutive sequences of the synchronization part and the information part. The symbol can be detected. (S1210)

Here, the detecting step may determine that a preamble symbol exists at a position corresponding to the largest value calculated by multiplying all the output values of the correlators delayed in units of length of each sequence in the frame.

Further, the frequency offset may be measured based on the plurality of first sequences included in the synchronization part, and the phase change amount of the information part may be measured based on the plurality of second sequences included in the information part (S1220).

In addition, signaling data of the preamble symbol may be detected based on the frequency offset and the phase change amount (S1230).

Here, the measuring step may sequentially compare each sequence while sequentially delaying the plurality of first sequences and the plurality of second sequences to measure a frequency offset and a phase change amount.

On the other hand, each of the plurality of first sequences is the same as each other, and the signals related to the amount of phase change of the information part are respectively mapped to the plurality of second sequences, and the amount of phase change is the amount of phase change between adjacent second sequences among the plurality of second sequences. to be.

Here, the signal relating to the amount of phase change is a signal modulated using a DBPSK (Differential Binary Phase Shift Keying) method.

Further, the plurality of first sequences and the plurality of second sequences may be Zadoff-Chu sequences.

Here, the plurality of first sequences and the plurality of second sequences may be the same Zadoff-Chu sequence multiplied by a phase value of 0 degrees and a phase value of 180 degrees.

Meanwhile, a non-transitory computer readable medium in which a program for sequentially performing a control method according to the present invention is stored may be provided.

As an example, a non-transitory readable medium storing a program storing a program for inserting a preamble symbol including a synchronization part and an information part into a frame and transmitting a frame including a preamble symbol ( Non-transitory computer readable medium) may be provided.

In addition, as an example, receiving a frame including a preamble symbol including a synchronization part (synchronization part) and an information part, and measuring a frequency offset based on a plurality of first sequences included in the synchronization part, , Non-transitory readout in which a program for measuring a phase change amount of the information part based on a plurality of second sequences included in the information part and detecting signaling data of a preamble symbol based on the frequency offset and phase change amount are stored. A non-transitory computer readable medium can be provided.

The non-transitory readable medium means a medium that stores data semi-permanently and that can be read by a device, rather than a medium that stores data for a short time, such as registers, caches, and memory. Specifically, the various applications or programs described above may be stored and provided in a non-transitory readable medium such as a CD, DVD, hard disk, Blu-ray disk, USB, memory card, ROM, and the like.

In addition, although the bus is not illustrated in the above-described block diagram showing the transmitting device and the receiving device, communication between each component in the transmitting device and the receiving device may be performed through the bus. Further, each device may further include a processor, such as a CPU or a microprocessor, which performs the various steps described above.

In addition, although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the technical field to which the present invention pertains without departing from the gist of the present invention claimed in the claims. In addition, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical idea or prospect of the present invention.

200: transmitting device 210: preamble symbol insertion unit
220: transmitting unit 700: receiving device
710: receiving unit 720: preamble symbol detection unit

Claims (24)

A preamble symbol inserting unit for inserting a preamble symbol including a synchronization part and an information part into a frame; And
Includes; transmitting unit for transmitting a frame including the preamble symbol,
The synchronization part includes a plurality of first sequences for measuring the frequency offset of the preamble symbol, and the information part includes a plurality of second sequences for measuring a phase change amount of the information part,
The plurality of first sequences include the same sequence having the same phase,
A transmission apparatus, wherein a phase change amount between each of the plurality of second sequences and at least one adjacent second sequence is mapped to each of the plurality of second sequences. delete According to claim 1,
The amount of phase change mapped to each of the plurality of second sequences is,
A transmission device characterized in that the signal is modulated using a DBPSK (Differential Binary Phase Shift Keying) method. According to claim 1,
The plurality of first sequences and the plurality of second sequences,
A transmission device, characterized in that it is a Zadoff-Chu sequence. According to claim 4,
The plurality of first sequences and the plurality of second sequences,
A transmission apparatus characterized by multiplying the same Zadoff-Chu sequence by a phase value of 0 degrees and a phase value of 180 degrees. A receiver configured to receive a frame including a preamble symbol including a synchronization part and an information part; And
The preamble symbol is detected based on a plurality of consecutive sequences of the synchronization part and the information part, and the frequency offset of the preamble symbol is measured based on the plurality of first sequences included in the synchronization part, and the information part is It includes; a preamble symbol detector for measuring a phase change amount of the information part based on a plurality of second sequences included, and detecting signaling data of the preamble symbol based on the frequency offset and the phase change amount.
The plurality of first sequences include the same sequence having the same phase,
A receiving device, wherein a phase change amount between each of the plurality of second sequences and at least one adjacent second sequence is mapped to each of the plurality of second sequences. The method of claim 6,
The preamble symbol detection unit,
A receiving apparatus characterized by measuring the frequency offset and the amount of phase change of the information part by sequentially comparing each sequence while sequentially delaying the plurality of first sequences and the plurality of second sequences. The method of claim 7,
The preamble symbol detection unit,
A receiving device characterized in that it is determined that the preamble symbol exists at a position corresponding to the largest value calculated by multiplying all the output values of the correlators delayed in units of length of each sequence in the frame. delete The method of claim 6,
The amount of phase change mapped to each of the plurality of second sequences is,
A receiving device characterized in that the signal is modulated using a DBPSK (Differential Binary Phase Shift Keying) method. The method of claim 6,
The plurality of first sequences and the plurality of second sequences,
A receiving device characterized in that it is a Zadoff-Chu sequence. The method of claim 11,
The plurality of first sequences and the plurality of second sequences,
A receiving apparatus characterized by multiplying the same Zadoff-Chu sequence by a phase value of 0 degrees and a phase value of 180 degrees. Inserting a preamble symbol including a synchronization part and an information part into a frame; And
And transmitting a frame including the preamble symbol.
The synchronization part includes a plurality of first sequences for measuring the frequency offset of the preamble symbol, and the information part includes a plurality of second sequences for measuring a phase change amount of the information part,
The plurality of first sequences include the same sequence having the same phase,
A control method of a transmitting apparatus, wherein a phase change amount between each of the plurality of second sequences and at least one adjacent second sequence is mapped to each of the plurality of second sequences. delete The method of claim 13,
The amount of phase change mapped to each of the plurality of second sequences is,
A control method of a transmitting device, characterized in that the signal is modulated using a DBPSK (Differential Binary Phase Shift Keying) method. The method of claim 13,
The plurality of first sequences and the plurality of second sequences,
A control method of a transmitting apparatus, characterized in that it is a jaedofu (Zadoff-Chu) sequence. The method of claim 16,
The plurality of first sequences and the plurality of second sequences,
The same Zadoff-Chu sequence multiplied by a phase value of 0 degrees and a phase value of 180 degrees. Receiving a frame including a preamble symbol including a synchronization part and an information part;
The preamble symbol is detected based on a plurality of consecutive sequences of the synchronization part and the information part, and the frequency offset of the preamble symbol is measured based on the plurality of first sequences included in the synchronization part, and the information part is Measuring a phase change amount of the information part based on a plurality of second sequences included; And
And detecting signaling data of the preamble symbol based on the frequency offset and the phase change amount.
The plurality of first sequences include the same sequence having the same phase,
A method of controlling a receiving apparatus, wherein a phase change amount between each of the plurality of second sequences and at least one adjacent second sequence is mapped to each of the plurality of second sequences. The method of claim 18,
The measuring step,
A control method of a reception apparatus, characterized in that each of the sequences is sequentially compared while sequentially delaying the plurality of first sequences and the plurality of second sequences to measure the frequency offset and the amount of phase change of the information part. The method of claim 19,
The detecting step,
A control method of a receiving apparatus, characterized in that it is determined that the preamble symbol exists at a position corresponding to the largest value calculated by multiplying all of the delayed correlator output values in units of length of each sequence in the frame. . delete The method of claim 18,
The amount of phase change mapped to each of the plurality of second sequences is,
Control method of a receiving device, characterized in that the signal is modulated using a DBPSK (Differential Binary Phase Shift Keying) method. The method of claim 18,
The plurality of first sequences and the plurality of second sequences,
A method of controlling a receiving device, characterized in that it is a Zadoff-Chu sequence. The method of claim 23,
The plurality of first sequences and the plurality of second sequences,
A control method of a receiving device, characterized in that the same Zadoff-Chu sequence is multiplied by a phase value of 0 degrees and a phase value of 180 degrees.

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