KR20150016869A - Transmitter, receiver and controlling method thereof - Google Patents

Abstract

A transmitter is disclosed. The transmitter includes: a preamble symbol insertion unit inserting a preamble symbol including a synchronization part and an information part into a frame; and a transmission unit transmitting the frame including the preamble symbol, wherein 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 variation in the phase of the information part. Thus, a receiver may accurately detect the preamble symbol based on the same sequences inserted into the preamble symbol, the complexity of the configuration of the receiver also decreases and a data transmission rate also increases.

Description

TECHNICAL FIELD [0001] The present invention relates to a transmitting apparatus, a receiving apparatus, and a control method therefor.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitting apparatus, a receiving apparatus, and a control method thereof, and more particularly to a transmitting apparatus, a receiving apparatus, and a control method thereof using an OFDM scheme.

DVB-T2 is a second-generation European terrestrial digital broadcasting standard that improves the performance of DVB-T, which is being adopted as a standard in more than 35 countries around the world including Europe. DVB- -T2 adopts the latest technologies such as LDPC (Low Density Parity Check) code and 256QAM modulation method to realize transmission capacity increase and high bandwidth efficiency, and thus it is possible to provide various high quality services such as HDTV in a limited bandwidth .

Meanwhile, the T2-FRAME 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 for performing synchronization and transmitting signaling data. Detects the P1 preamble symbol, performs synchronization using the detected P1 preamble symbol, compensates the frequency offset, and receives signaling data.

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

Accordingly, a method of using a preamble symbol using a Zadoff-Chu sequence has been developed so that a preamble starting point can be accurately located within one sample.

1 is a view for explaining a conventional technique. Specifically, the sync signal is composed of eight Zadoff-Chu sequences (110). Since five of the eight Zadoff-Chu sequences are used for transmitting a sync signal, data can be transmitted and transmitted in only three sequences 120 .

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

Accordingly, there has been a need to increase the amount of information transmission in the preamble symbol, improve the preamble detection performance in the reception apparatus, and reduce the complexity of the reception apparatus.

An object of the present invention is to provide a transmitting apparatus, a receiving apparatus, and a control method thereof using a preamble symbol including a plurality of identical sequences.

According to an aspect of the present invention, there is provided a transmitting apparatus including a preamble symbol inserter for inserting a preamble symbol including a synchronization part and an information part into a frame, Wherein the synchronization part comprises a plurality of first sequences for measuring frequency offsets and the information part comprises a plurality of second sequences for measuring a phase change amount of the information part, .

Here, each of the plurality of first sequences is identical to each other, and the plurality of second sequences are respectively mapped to signals relating to the phase variation amount of the information part, 2 < / RTI > sequences.

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

On the other hand, 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 and a phase value of 180 degrees.

A receiving apparatus according to an embodiment of the present invention includes a receiver for receiving 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 A frequency offset is measured based on a plurality of first sequences included in the synchronization part, and a phase change amount of the information part based on the plurality of second sequences included in the information part And a preamble symbol detector for detecting signaling data of the preamble symbol based on the frequency offset and the phase change amount.

Here, the preamble symbol detection unit may continuously measure the frequency offset and the phase change amount by sequentially comparing the sequences while sequentially delaying the plurality of first sequences and the plurality of second sequences.

The preamble symbol detector may determine that the preamble symbol exists at a position corresponding to a largest value calculated by multiplying the correlator output values delayed by a length unit of each sequence in the frame .

Each of the plurality of first sequences is identical to the plurality of second sequences, and the plurality of second sequences are mapped to signals relating to the phase variation amount of the information part, 2 < / RTI > sequences.

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

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 and a phase value of 180 degrees.

Meanwhile, a method of controlling a transmitting 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 Wherein 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 identical to each other, and the plurality of second sequences are respectively mapped to signals relating to the phase variation amount of the information part, 2 < / RTI > sequences.

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 and a phase value of 180 degrees.

Meanwhile, a method of controlling a receiving apparatus according to an embodiment of the present invention includes receiving a frame including a preamble symbol including a synchronization part and an information part, The method comprising the steps of: detecting the preamble symbol based on a plurality of consecutive sequences; measuring a frequency offset based on a plurality of first sequences included in the synchronization part; and determining, based on the plurality of second sequences included in the information part 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 sequentially measure the frequency offset and the phase change amount by continuously comparing the sequences while sequentially delaying the plurality of first sequences and the plurality of second sequences.

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

The first plurality of sequences are mapped to each other and the plurality of second sequences are respectively mapped to signals relating to the phase variation amount of the information part, 2 < / RTI > sequences.

On the other hand, the signal related to the phase variation amount 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 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 and a phase value of 180 degrees.

As described above, according to the 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 also reduced, .

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

2, the transmitting apparatus 200 includes a preamble symbol inserter 210 and a transmitter 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 can transmit a frame including a preamble symbol.

Here, the preamble symbol can be used to synchronize frames by informing the start point of the frame. The transmitting apparatus 200 can transmit frames according to the DVB-T2 scheme. At this time, the data is transmitted using the DVB-T2 scheme The unit to be transmitted is called a T2 frame.

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

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

Referring to FIG. 3, a plurality of T2 frame structures in the time domain of DVB-T2 are shown. One T2 frame 310 includes a P1 preamble symbol 320 and a L1 (Layer1) A P2 preamble symbol 330 for transmitting a signal and a data symbol 340 for transmitting a broadcast signal.

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

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

A transmitter 400 for generating a T2 signal using the DVB-T2 scheme 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 the baseband frame format signal from the input broadcast signal.

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

Here, in the DVB-T2 scheme, there are 64800 bit and 16400 bit LDPC codes, and input signals can be encoded by various coding rates. Meanwhile, the encoded signal may be modulated by Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (QAM), 64 QAM, or 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 a Peak to Average Power Ratio (PAPR) .

On the other hand, the OFDM generator 440 may convert an input signal from the frame mapper 230 into a time domain signal using an Inverse Fast Fourier Transform (IFFT) scheme for converting a frequency domain signal into a time domain signal have.

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 inserter 210 according to an embodiment of the present invention may correspond to the preamble generator 450 of the transmitter using the DVB-T2 scheme.

Referring back to FIG. 2, the transmitting apparatus 200 can transmit a frame including the P1 preamble symbol, as described above. 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 includes a plurality of first sequences for measuring a frequency offset, and the information part may include a plurality of second sequences for measuring a phase variation amount of the information part.

The synchronization part is a part used for measuring the frequency offset in accurately detecting the signaling data of the preamble symbol. The Zadoff-Chu sequence appears as a time delay and a phase shift of the correlator output value in the presence of a frequency offset.

Here, the phase shift appears with a constant magnitude depending on the position where the sequence exists. This will be described in more detail.

FIG. 6 is a diagram illustrating a phase change reflected by the influence of a frequency offset according to an exemplary embodiment of the present invention. Referring to FIG.

Referring 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 shown. It can be seen that each peak 610 has a different phase value. Here, the reason that each peak value 610 has a different phase value is due to the influence of the frequency offset.

It can also be seen that the phase values corresponding to the respective peak values 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 first peak is different from the phase value due to the frequency offset of the third peak and the phase value due to the frequency offset of the second peak . For example, if there are a total of eight peak values x0, x1, x2, x3, x4, x5, x6, x7, the phase values corresponding to each peak are z, 2 * z, 5 * z, 6 * z, 7 * z, 8 * z. This is because the phase values corresponding to the respective peaks are linearly changed as described above.

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, and the difference between the phase values corresponding to x3 and x2 and the difference between the phase values corresponding to x4 and x3 It can be seen that the difference in phase values is all z.

That is, as described above, the difference of the phase values corresponding to the two consecutive peaks is the difference of the frequency offset values that affected the phases of the respective peaks, and the frequency offset values Are all the same.

Accordingly, by summing the phase values of the peaks that are paired with each other and subtracting the same frequency offset value, it is possible to grasp the phase change of the peaks except for the influence of the frequency offset.

Therefore, if the receiving apparatus 700 knows only the phase change between the frequency offset and the adjacent sequence, it can calculate the phase value between all the sequences, and can detect the signaling data from the preamble symbol based on the calculated phase value.

The configuration of the preamble symbol for measuring the phase shift between the frequency offset and the 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 a frequency offset, and the information part includes a plurality of second sequences for measuring a phase variation amount of the information part, wherein , Each of the plurality of first sequences is equal to each other, and the plurality of second sequences are mapped to signals relating to the amount of phase change of the information part.

The phase change amount means a phase change amount between adjacent second sequences of the plurality of second sequences.

In addition, for example, since the plurality of first sequences are for measuring the frequency offset, the frequency offset can be measured on the basis of only two first sequences.

5 is a diagram illustrating a 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.

The synchronization part 510 may include two identical sequences 511 and 512 and the information part 520 may include other sequences 521, 522, and 523 that are randomly mixed.

Here, the reason why two identical sequences 511 and 512 are included in the synchronization part 510 is that the frequency offset is measured 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.

Signals relating to the phase variation amounts of the information parts are respectively mapped to a plurality of other sequences 521, 522, and 523 included in the information part 520. [ Here, the phase change amount is a phase change amount between adjacent sequences of the plurality of different sequences 521, 522, and 523. [

For example, assuming that the sequence having the phase 0 of the sequence 0 changed by 180 degrees is the sequence 1, the sequence 0 and the sequence 1 have a phase difference of 180 degrees from each other.

Accordingly, the two sequences 0 (511, 512) included in the synchronization part 510 have the same phase, so that the frequency offset can be measured based thereon.

The three sequences 521, 522 and 523 included in the information part 520 are composed of a sequence 1, a sequence 1 and a sequence 0, and the sequence 1 521 arranged at the beginning of the information part 520 The phase difference with the second arranged sequence 0 522 of the synchronous part 510 becomes 180 degrees and the second arranged sequence 1 522 of the information part 520 becomes the same as the previous sequence 1 521 So that the phase difference becomes zero degree.

In addition, the sequence 0 (523) arranged third in the information part 520 has a phase difference of 180 degrees from the sequence 0 (522) arranged second.

That is, the phase change amount of the information part 520 means a phase change amount with respect to the immediately preceding sequence among adjacent sequences among a plurality of sequences included in the information part 520.

On the other hand, the calculated signal regarding the amount of phase change can 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 DBPSK (Differential Binary Phase Shift Keying) method. Here, the DBPSK scheme refers to a phase modulation scheme that performs a logical sum of binary codes on the transmission apparatus side to shift to two phases, and is standardized (IEEE 802.11) for use as a baseband modulation scheme in a wireless LAN. Spectrum (DS-SS) method.

For example, if a binary code composed of a logical OR of codes to be transmitted on the transmitting apparatus side is transmitted in a manner corresponding to the opposite phase to the in-phase of the carrier wave, the receiving apparatus side performs the logical conversion after the demodulation process and restores the original pulse .

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

The phase change amount between the sequence 1 522 and the previous sequence 1 521 arranged in the information part 520 is binary-coded by the DBPSK method and stored in the DBPSK 2 bit 522-1, Lt; RTI ID = 0.0 > 1 < / RTI >

The phase change amount between the sequence 0 523 arranged third in the information part 520 and the sequence 0 522 arranged second is binary-coded by the DBPSK method and stored in the DBPSK 3 bit 523-1 Is mapped to the sequence 0 (523) arranged third in the information part (520).

In FIG. 5, the information part 520 includes three sequences. However, the information part 520 may include a larger number of sequences, for example.

The preamble symbol inserter 210 inserts a preamble symbol including the synchronization part 510 and the information part 520 into a frame where the same sequence 511 included in the synchronization part 510 And 512 are for measuring a frequency offset and a plurality of other sequences 521, 522 and 523 included in the information part 520 are for measuring a phase change amount of the information part 520.

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

On the other hand, the plurality of first sequences and the plurality of second sequences may be a Zadoff-Chu sequence. Herein, the Doppler sequence has a constant envelope in the time and frequency domain, and thus has a good peak-to-average power ratio (PAPR) characteristic, Performance.

In addition, the Doppler sequence has a characteristic that the circular autocorrelation to the non-zero shift is zero. Therefore, the terminal apparatuses transmitting the control information using the same < RTI ID = 0.0 > Doppler < / RTI > sequences can be distinguished by different cyclic shift values of the Doppler sequences.

That is, the Doppler sequences may be used to calculate the correlation values differently when they are the same or different from each other.

Accordingly, by inserting the Dopod sequence into the preamble symbol according to the embodiment of the present invention, two identical Doppler sequences 511 and 512 included in the synchronization part 510 are used to measure the frequency offset , The plurality of the daughter dopchu sequences 521, 522, and 523 included in the information part 520 can be used to measure the phase change based on the correlation between the adjacent daughter dopchy sequences.

On the other hand, according to one embodiment, a plurality of first sequences and a plurality of second sequences may be one in which the same Zadoff-Chu sequence is multiplied by a phase value of 0 and multiplied by a phase value of 180 degrees.

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

7, the receiving apparatus 700 may include a receiving unit 710 and a preamble symbol detecting unit 720.

The receiving apparatus 700 may be, for example, a broadcasting signal receiving apparatus to which the DVB-T2 scheme is applied. The broadcast signal receiving apparatus to which the DVB-T2 scheme is applied is constituted by a preamble detecting unit (not shown), an OFDM demodulator (not shown), a frame demapper (not shown), a BICM decoder (not shown) and a stream generating unit .

Briefly explaining each configuration, preamble symbols transmitted from a plurality of antennas are transmitted by a frequency division multiplexing method. A preamble detection unit (not shown) can distinguish preamble symbols transmitted through a plurality of antennas.

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

In addition, the BICM decoder (not shown) decodes the received signal, and the stream generating unit (not shown) can generate a broadcast signal based on the decoded signal.

Here, the preamble symbol detector 720 according to an embodiment of the present invention may be applied to a preamble detector (not shown) of a broadcast signal receiver using a DVB-T2 scheme.

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

The preamble symbol detection unit 720 delays the length of each sequence in the frame based on the plurality of sequences included in the synchronization part and the information part and outputs the result to the maximum value calculated by multiplying the output value of the correlator It can be determined that a preamble symbol exists in the corresponding position.

The preamble symbol detector 720 measures the frequency offset based on the plurality of first sequences included in the synchronization part and measures the amount of phase change of the information part 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 with reference to FIG. 5, the preamble symbol detector 720 can measure a 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 detector 720 can measure the frequency offset based on the same phase.

The preamble symbol detector 720 can measure a phase change amount 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 can measure a phase change based on a signal relating to a phase change amount of the information part 520 mapped to each of the plurality of sequences 521, 522, and 523.

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

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

8 is a detailed block diagram of a receiving apparatus according to an embodiment of the present invention.

Referring to FIG. 8, the preamble symbol detector 720 may be configured to detect a phase change by delaying the output of the correlator and the correlator by a length of a sequence.

Here, the receiving unit 710 receives a preamble symbol including five (511, 512, 521, 522, 523) of the elliptic curve sequences shown in FIG. 5 and the preamble symbol detecting unit 720 detects the preamble symbol It is possible to detect the frequency offset 840 based on the two overlap periods 511 and 512 included in the synchronization part 510. [

The preamble symbol detection unit 720 detects five preamble symbol sequences 511, 512, 521, 522 and 523 from the arithmetic dopodext sequence 523 arranged at the rightmost end of the information part 520, It is possible to sequentially delay the output of the collapse sequence correlator.

The preamble symbol detection unit 720 correlates the received five Dopod-sequence sequences 511, 512, 521, 522, and 523 with the AOD sequence stored in the reception apparatus 700, sequentially delays the AOD sequence, The phase change 810, 820, 830 between the consecutive sequences can be detected. Here, the phase changes 810, 820, and 830 between the detected elliptic curve sequences denote a phase change of the information part 520.

The preamble symbol detector 720 can collectively subtract the frequency offsets 840 detected from the phase shifts 810, 820, and 830 between the adjacent slave dopes sequences detected while sequentially delaying the preamble symbol detector 720 and store the sum.

Meanwhile, the preamble symbol detector 720 can 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 all of the correlator output values delayed by the length of the sequence by using the characteristic that the output value of the correlator of the continuous Doped-post sequence is constant in units of the length of the sequence It can be determined that a preamble symbol exists at a position corresponding to the largest calculated value.

In FIG. 8, as shown in FIG. 5, there are four modules for measuring a phase change by delaying a preamble symbol including five OCD sequences, but the present invention is not limited thereto, In the case of the preamble symbol including the chu sequence, the number of modules for measuring the phase change by delaying increases accordingly.

9 is a diagram for explaining a method of detecting a preamble symbol in 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 and 1020 included in the received preamble symbol 1000.

The preamble symbol detector 720 can measure a phase change amount based on the plurality of sequences 1030, 1040, and 1050. The sequence 0 (1020) and the next sequence 1 1030 are phase shifted by 180 degrees The sequence 1 1040 and the next sequence 1 1040 can measure the phase change of 0 degree and the sequence 1 1040 and the next sequence 0 1050 ) Can measure the phase change of 180 degrees.

The preamble symbol detector 720 can detect a 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 when there are two identical sequences, and can accurately calculate the phase change by reflecting the measured frequency offset. Therefore, The ratio is reduced. As a result, the rate at which data can be transmitted is further increased, thereby increasing the data rate.

Also, if the receiving apparatus 700 has only one sequence, all signals can be detected and restored, so that the structure of the receiving apparatus 700 can be simplified.

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

According to the method shown 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 the preamble symbol may be transmitted (S1120).

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

Each of the plurality of first sequences is identical to each other, and the plurality of second sequences are respectively mapped to signals relating to a phase variation amount of the information part, and the phase variation amount is a phase variation amount between adjacent second sequences of the plurality of second sequences Lt; / RTI >

Here, the signal related to the phase change amount may be 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 may be a Zadoff-Chu sequence.

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

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

According to the method shown in FIG. 11, a frame including a preamble symbol including a synchronization part and an information part is received, and based on a plurality of consecutive sequences of the synchronization part and the information part, (S1210). ≪ RTI ID = 0.0 >

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

Then, the frequency offset is measured based on the plurality of first sequences included in the synchronization part, and the phase variation amount of the information part can be measured based on the plurality of second sequences included in the information part (S1220).

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

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

On the other hand, a plurality of first sequences are mutually the same, and a plurality of second sequences are mapped with signals relating to a phase variation amount of the information part, and the phase variation amount is a phase variation amount between adjacent second sequences to be.

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

The plurality of first sequences and the plurality of second sequences may be a Zadoff-Chu sequence.

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

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

In one example, a program for performing a step of inserting a preamble symbol including a synchronization part and an information part into a frame and transmitting a frame including a preamble symbol is stored in a non-transitory readable medium non-transitory computer readable medium may be provided.

Also, one example includes receiving a frame including a preamble symbol including a synchronization part and an information part, measuring a frequency offset based on a plurality of first sequences included in the synchronization part A step of measuring a phase change amount of the information part based on a plurality of second sequences included in the information part, and a step of detecting signaling data of the preamble symbol based on the frequency offset and the phase change amount, A non-transitory computer readable medium may be provided.

A non-transitory readable medium is a medium that stores data for a short period of time, such as a register, cache, memory, etc., but semi-permanently stores data and is readable by the apparatus. In particular, the various applications or programs described above may be stored on non-volatile readable media such as CD, DVD, hard disk, Blu-ray disk, USB, memory card, ROM,

Although the buses are not shown in the above-described block diagrams for the transmitting apparatus and the receiving apparatus, the communication between the respective elements in the transmitting apparatus and the receiving apparatus may be performed via the bus. Further, each device may further include a processor such as a CPU, a microprocessor, or the like that performs the various steps described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention.

200: transmitting apparatus 210: preamble symbol inserting unit
220: transmitting unit 700: receiving device
710: Receiver 720: Preamble symbol detector

Claims (24)

A preamble symbol inserter for inserting a preamble symbol including a synchronization part and an information part into a frame; And
And a transmitter for transmitting a frame including the preamble symbol,
Wherein 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. The method according to claim 1,
Each of the plurality of first sequences being equal to each other,
Wherein signals relating to the phase variation amount of the information part are respectively mapped to the plurality of second sequences,
Wherein the phase variation amount is a phase variation amount between adjacent second sequences of the plurality of second sequences. 3. The method of claim 2,
The signal relating to the amount of phase change,
Wherein the signal is a signal modulated using a DBPSK (Differential Binary Phase Shift Keying) scheme. 3. The method of claim 2,
Wherein the plurality of first sequences and the plurality of second sequences comprise:
Wherein the Zadoff-Chu sequence is a Zadoff-Chu sequence. 5. The method of claim 4,
Wherein the plurality of first sequences and the plurality of second sequences comprise:
Wherein the same Zadoff-Chu sequence is multiplied by a phase value of 0 and multiplied by a phase value of 180 degrees. A receiver for receiving a frame including a preamble symbol including a synchronization part and an information part; And
Detecting the preamble symbol based on a plurality of consecutive sequences of the synchronization part and the information part, measuring frequency offsets based on the plurality of first sequences included in the synchronization part, And a preamble symbol detection unit for measuring a phase change amount of the information part based on the second sequence and detecting signaling data of the preamble symbol based on the frequency offset and the phase change amount. The method according to claim 6,
Wherein the preamble symbol detector comprises:
Wherein the frequency offset and the phase change amount are measured by successively comparing the sequences while sequentially delaying the plurality of first sequences and the plurality of second sequences. 8. The method of claim 7,
Wherein the preamble symbol detector comprises:
Wherein the determining unit determines that the preamble symbol exists at a position corresponding to a largest value calculated by multiplying all correlator output values delayed by a length unit of each sequence in the frame. The method according to claim 6,
Each of the plurality of first sequences being equal to each other,
Wherein signals relating to the phase variation amount of the information part are respectively mapped to the plurality of second sequences,
Wherein the amount of phase change is a phase change amount between adjacent second sequences of the plurality of second sequences. 10. The method of claim 9,
The signal relating to the amount of phase change,
Is a signal modulated using a DBPSK (Differential Binary Phase Shift Keying) scheme. 10. The method of claim 9,
Wherein the plurality of first sequences and the plurality of second sequences comprise:
Wherein the Zadoff-Chu sequence is a Zadoff-Chu sequence. 12. The method of claim 11,
Wherein the plurality of first sequences and the plurality of second sequences comprise:
Wherein the same Zadoff-Chu sequence is multiplied by a phase value of 0 and multiplied by a phase value of 180 degrees. The method comprising: inserting a preamble symbol including a synchronization part and an information part into a frame; And
And transmitting a frame including the preamble symbol,
Wherein the synchronization part includes a plurality of first sequences for measuring frequency offsets and the information part includes a plurality of second sequences for measuring a phase change amount of the information part . 14. The method of claim 13,
Each of the plurality of first sequences being equal to each other,
Wherein signals relating to the phase variation amount of the information part are respectively mapped to the plurality of second sequences,
Wherein the phase change amount is a phase change amount between adjacent second sequences of the plurality of second sequences. 15. The method of claim 14,
The signal relating to the amount of phase change,
Wherein the control signal is a signal modulated using a DBPSK (Differential Binary Phase Shift Keying) method. 15. The method of claim 14,
Wherein the plurality of first sequences and the plurality of second sequences comprise:
And a Zadoff-Chu sequence. 17. The method of claim 16,
Wherein the plurality of first sequences and the plurality of second sequences comprise:
Wherein the same Zadoff-Chu sequence is multiplied by a phase value of 0 and multiplied by a phase value of 180 degrees. A method comprising: receiving a frame including a preamble symbol including a synchronization part and an information part;
Detecting the preamble symbol based on a plurality of consecutive sequences of the synchronization part and the information part, measuring frequency offsets based on the plurality of first sequences included in the synchronization part, Measuring a phase change amount of the information part based on a second sequence; And
And detecting signaling data of the preamble symbol based on the frequency offset and the phase change amount. 19. The method of claim 18,
Wherein the measuring step comprises:
Wherein the frequency offset and the phase change amount are measured by successively comparing the sequences while sequentially delaying the plurality of first sequences and the plurality of second sequences. 20. The method of claim 19,
Wherein the detecting comprises:
And determines that the preamble symbol exists at a position corresponding to a largest value calculated by multiplying all correlator output values delayed by a length unit of each sequence in the frame. . 19. The method of claim 18,
Each of the plurality of first sequences being equal to each other,
Wherein signals relating to the phase variation amount of the information part are respectively mapped to the plurality of second sequences,
Wherein the phase variation amount is a phase variation amount between adjacent second sequences of the plurality of second sequences. 22. The method of claim 21,
The signal relating to the amount of phase change,
Wherein the signal is a signal modulated using a DBPSK (Differential Binary Phase Shift Keying) method. 22. The method of claim 21,
Wherein the plurality of first sequences and the plurality of second sequences comprise:
Wherein the Zadoff-Chu sequence is a Zadoff-Chu sequence. 24. The method of claim 23,
Wherein the plurality of first sequences and the plurality of second sequences comprise:
Wherein the same Zadoff-Chu sequence is multiplied by a phase value of 0 degrees and multiplied by a phase value of 180 degrees.

Images