KR101145379B1 - Apparatus and method for using transmitter and receiver with heterogeneous bandwidths in wireless communication system - Google Patents

Abstract

The present invention relates to a wireless communication system for dividing an entire frequency resource into at least one transmission / reception frequency minimum unit. The wireless communication system divides and allocates data to be transmitted to receivers having various bandwidths in the minimum transmission / reception frequency unit, and allocates channel allocation information of the data. A subcarrier mapper inserted into each of the minimum transmission / reception frequency units, and an IFFT operator performing an inverse fast Fourier transform (IFFT) on the data mapped to the subcarriers to maximize flexibility of the wireless communication system. It is possible to support a service type, and also a communication system in which base stations having different bandwidths are mixed is possible, thereby maximizing flexibility in cell planning of a mobile communication system. In addition, since no guard band is required on the frequency spectrum, the entire frequency spectrum of the system can be used. Therefore, frequency efficiency can be maximized by integrating frequency spectrum allocated by various operators.

Grid, Bandwidth, Wireless Communication System, Channel Allocation Information, Guard Band

Description

Apparatus and method for using a transceiver with a different bandwidth in a wireless communication system {APPARATUS AND METHOD FOR USING TRANSMITTER AND RECEIVER WITH HETEROGENEOUS BANDWIDTHS IN WIRELESS COMMUNICATION SYSTEM}

1 is a diagram illustrating a frame structure of an IEEE 802.16 d / e system;

2 is a diagram showing a frequency band of a conventional ISDB-T scheme;

3 is a diagram illustrating a structure in which receivers having various bandwidths receive a wideband transmission signal according to the present invention;

4 is a block diagram of a base station for transmitting a wideband transmission signal according to the present invention;

5 is a diagram illustrating a procedure for transmitting a broadband transmission signal according to an embodiment of the present invention;

FIG. 6 is a diagram illustrating a structure in which transmission data having various bandwidths are allocated to grid transmission signals according to the present invention for each grid; FIG.

7 is a block diagram of a terminal for selecting and receiving only a band required by a user according to the present invention;

8 is a diagram illustrating a structure in which a user selects only a required band according to an embodiment of the present invention;

9 is a diagram illustrating a procedure for receiving only data of a band allocated to a receiver in a wideband transmission signal according to an embodiment of the present invention;

10 is a diagram illustrating a structure for detecting synchronization of a receiver according to an embodiment of the present invention; and

11 is a diagram illustrating a structure for searching a cell according to an embodiment of the present invention.

The present invention relates to an apparatus and method for using a transceiver having a different bandwidth in a wireless communication system, and to an apparatus and method for supporting a frame structure for receiving a wideband transmission signal by a receiver having various bandwidths in the wireless communication system.

The next generation wireless communication system provides various services such as data, video, and multimedia services as well as voice according to the user's inclination. Therefore, receivers having a plurality of frequency bands in one system, that is, using a limited frequency band efficiently and expanding the capacity of the user, that is, a receiver using a low information rate service, have a narrow bandwidth and a high information rate service. In order to operate a wider bandwidth, a receiver using a multi-bandwidth system that can efficiently use frequency resources has been studied.

In prior art wireless communication systems, the transceiver supports the same bandwidth. Although the system supporting the same frequency band (for example, Orthogonal Frequency Multiple Division Access (OFDMA) and Integrated Service Digital Broadcasting-Terrestrial (ISDB-T)) uses a scheme that supports different data rates for each terminal station, These are also systems with the same bandwidth of the transceiver.

1 illustrates a frame structure of an IEEE 802.16 d / e system.

When the transmission signal having the structure shown in FIG. 1 is received, each of the terminals (users A and B) receives the entire time-frequency domain of the frame. Thereafter, the terminals synchronize using the preamble 105 of the received frame, and each terminal receives a portion corresponding to its signal using channel allocation information included in the control information 107. . For example, user A receives area 101 and user B receives area 103.

That is, since the terminals receive only a part of the entire time-frequency region, the terminal has a partial rate compared to the total transmission rate of the base station. However, since the entire time-frequency region can be allocated to one terminal, the transceivers have the same bandwidth.

2 shows a frequency band of a conventional ISDB-T scheme.

As shown in FIG. 2, the frequency band of ISDB-T, which is a kind of digital broadcasting, includes a standard TV, an audio program, and an HD TV (High Definition Television). If a specific terminal wants to receive only the audio program, the audio program dedicated channel 201 is narrowband. Therefore, after receiving the entire frequency band instead of only receiving the audio program using a narrowband receiver, the audio program dedicated channel is detected through analog filter and digital signal processing (203). That is, the ISDB-T also has the same frequency bandwidth of the transceiver.

As described above, in the wireless communication system according to the related art, the transceivers have the same frequency bandwidth. For example, when signals of multiple users are multiplexed and transmitted in downlink of multi-user wireless communication, the receiver demodulates only a portion allocated to itself in the transmission signal. However, since the signal allocated to the receiver may exist anywhere in the entire time-frequency domain, the receiver receives the entire transmission signal region in the time-frequency domain. Thereafter, the receiver identifies a region allocated to itself by using channel allocation information among control information of the received signal.

However, in the next generation wireless communication system, the frequency bandwidth between operators may vary depending on the region, and in particular, as the types of receivers used vary (eg, handsets, notebook PCs, PDAs), the frequency bandwidths used in the receivers may vary. . In this case, unlike a system having the same frequency bandwidth of a conventional transceiver, a system capable of receiving a plurality of narrowband receivers only for an area corresponding to its signal for one broadband transmission signal is needed.

Accordingly, an object of the present invention is to provide an apparatus and method for using a receiver having a different frequency band in a wireless communication system.

Another object of the present invention is to provide an apparatus and method for supporting a frame structure for using a transceiver having a different frequency band in a wireless communication system.

Still another object of the present invention is to provide an apparatus and method for maximizing frequency efficiency by integrating frequency spectrum allocated by various operators since no guard band between operators is required.

According to a first aspect of the present invention for achieving the above object, a transmission apparatus of a wireless communication system using a whole frequency resource divided into one or more transmission and reception frequency minimum unit, the transmission and reception of data to be transmitted to receivers having various bandwidths A subcarrier mapper that divides and allocates the channel allocation information of the data into the minimum unit of transmission / reception frequency, and inverse fast Fourier transform (IFFT) of the data mapped to the subcarrier. It characterized in that it comprises an IFFT operator.

According to a second aspect of the present invention, a receiving apparatus of a wireless communication system using all frequency resources by dividing one or more transmitting / receiving frequency minimum units into an FFT operator for performing Fast Fourier Transform (FFT) on a received signal. And a filter unit for removing adjacent subcarriers of the minimum transmission / reception frequency unit from the fast Fourier transformed signal and channel allocation information existing for each transmission / reception frequency minimum unit in the output signal of the filter unit, for each transmission / reception frequency minimum unit. And a subcarrier demapper for extracting actual data.

According to a third aspect of the present invention, a method of transmitting a wireless communication system using all frequency resources by dividing one or more transmission / reception frequency minimum units into a wireless communication system includes: checking a bandwidth of receivers to transmit data and an amount of data to transmit to the receivers; And allocating the minimum transmission / reception frequency unit according to the bandwidths of the receivers, dividing the transmission / reception frequency minimum unit by the minimum transmission / reception frequency unit, and updating the channel allocation information of the data to be allocated. And dividing and allocating each of the transmission and reception frequency minimum units.

According to a fourth aspect of the present invention, a reception method of a wireless communication system in which all frequency resources are divided and used by at least one transmission / reception frequency minimum unit includes: detecting only a minimum transmission / reception frequency unit allocated to a receiver; And checking the channel allocation information of each of the minimum transmission / reception frequency units allocated to the receiver, and identifying the data allocated to each minimum transmission / reception frequency unit according to the channel allocation information.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The present invention describes a technique for using a transceiver having a different frequency band in a wireless communication system. In other words, an apparatus for supporting a frame structure for transmitting a band divided by a minimum unit of a plurality of transmit and receive frequency bands so that a receiver having various frequency bandwidths can receive a wideband transmission signal of a wideband transmitter in the wireless communication system; Describe the method. In the following description, a minimum unit of the transmission / reception frequency band is referred to as a lattice, and the lattice has a preamble and channel allocation information.

3 illustrates a structure in which receivers having various bandwidths receive a wideband transmission signal according to the present invention.

As shown in FIG. 3, when the base station transmits a transmission signal of the broadband 401 to each receiver (eg, a mobile phone, a notebook computer, a personal data assistant (PDA)), the base station receives the transmission signal. On the other hand, in the present invention, since the allocated bandwidth is different for each receiver, only the band allocated to the receiver is received. That is, the cellular phone receives only the frequency band 303 of the cellular phone, the notebook receives only the frequency band 305 of the notebook, and the PDA receives only the frequency band 307 of the PDA.

In other words, when receivers having various bandwidths receive the wideband transmission signal of the base station as shown in FIG. 3, one band is divided into a plurality of grids so that data to be transmitted to the receivers is matched to the bandwidth allocated to each receiver. A frame structure for transmitting and a technique of allowing the receivers having the various bandwidths to receive only their signals will be described. On the contrary, when the wideband receiver receives the narrowband transmission signal, it can be implemented through digital filtering after oversampling.

4 is a block diagram of a base station for transmitting a wideband transmission signal according to the present invention. In the following description, transmission of data 402, 404, and 406 of user A, user B, and user C using different bandwidths 401, 403, and 405 for each grid is described as an example.

As shown in FIG. 4, the base station includes a decoder 411, a modulator 413, a subcarrier mapper 415, a subcarrier mapping controller 417, an IFFT operator (Inverse Fast Fourier Transform) operator 419, and digital / The analog converter 421 and the RF unit 423 are configured.

First, the encoder 411 receives data to be transmitted to the users A, B, and C, and outputs the channel coding at the corresponding code rate. The modulator 413 modulates the data provided from the encoder 411 in a corresponding modulation scheme and outputs the modulated data. Here, the modulation scheme may be Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (16QAM), or 64QAM.

The subcarrier mapper 415 maps the data provided from the modulator 413 to the subcarrier under the control of the subcarrier mapping controller 417 and outputs the data. Furthermore, according to the present invention, the subcarrier mapper 415 is composed of a channel assignment information inserter 431, a data allocator 433, and an adder 435. The channel allocation information inserter 431 inserts channel allocation information allocated to each grid by dividing the data provided by the subcarrier mapping controller 417 into each grid (601, 603, 605).

The data allocator 433 divides the data to be transmitted according to the channel allocation information according to the control of the subcarrier mapping controller 417 and allocates the data for each grid.

 The adder 435 adds the output signals of the channel assignment information inserter 431 and the data allocator 433 to the IFFT operator 419. That is, the subcarrier mapper 415 divides the data 402, 404, and 406 of the users A, B, and C into the grids assigned to each user, as shown in FIG.

The subcarrier mapping controller 417 determines the bandwidths of the receivers of the users A, B, and C and the amount of data to be transmitted to each user, and then divides and assigns the control signals for each grid allocated to the receivers. A control signal for inserting channel allocation information of data allocated to each of the grids is generated.

The IFFT operator 419 converts the data provided from the subcarrier mapper 417 into inverse fast Fourier transform and converts data in the frequency domain into time sample data.

Thereafter, after converting the parallel data output from the IFFT operator 419 into serial data, the digital-to-analog converter 421 converts the serialized digital signal into an analog signal, and the RF unit 423 converts the analog data. The baseband signal is converted into a radio frequency band signal to be actually transmitted and output through an antenna.

5 illustrates a procedure for transmitting a broadband transmission signal according to an embodiment of the present invention.

Referring to FIG. 5, the base station first determines frequency bandwidths 401, 403, and 405 used by the receivers (eg, users A, B, and C) in step 501, and then the base station proceeds to step 503. Identify the amount of data 402, 404, 406 to be sent to each receiver.

In step 505, the base station determines whether the transmission data can be allocated to the time-frequency domain of the entire frame. If the transmission data can be allocated to the entire frame, the base station proceeds to step 507 and updates the channel allocation information of the data to be allocated to each grid under the control of the subcarrier mapping controller 417 of FIG. 4. do.

After updating the channel allocation information of each grid, the base station proceeds to step 509 to divide and allocate transmission data for each grid according to the updated channel assignment information, and then the base station proceeds to step 511 to each receiver. To send.

The base station then terminates this algorithm.

FIG. 6 illustrates a structure in which transmission data having various bandwidths are allocated to grids according to the present invention. Hereinafter, an example of dividing and assigning data 402, 404, and 406 of users A, B, and C using different bandwidths 401, 403, and 405 of FIG. . In addition, the user A is assigned to grid 1 (600), the user B is assigned to grid 2 (602) to grid 3 (604), the user C is the grid 1 (600) to grid 3 (604) Is assigned.

As shown in FIG. 6, the frame of the transmission signal transmitted from the base station is composed of a plurality of grids (lattice 1 600, grid 2 602, grid 3 604, ..., grid N). In addition, each of the gratings includes channel allocation information 601, 603, and 605 for data included in the gratings. Here, the size of the channel allocation information (601, 603, 605) is flexibly changed according to the data included in each grid.

That is, the data allocator 433 of FIG. 4 allocates the transmission data A-1 of the user A to the grid 1 600, and then assigns channel allocation information of the A-1 to the grid 1 600. Channel allocation information 601 is updated. Also, in the case of the user B and the user C, the transmission data of the user B and the user C are divided in the same manner as the user A (user B: B-1, B-2 user C: C-1, C-2). , C-3, C-4), and assigns to the grid assigned to each user (User B: Grid 2 to Grid 3, User C: Grid 1 to Grid 3), and then the channel of the grid to which the divided data is assigned. The allocation information 603, 605 is updated.

In this case, the grating may not always use the same grating but may use a different grating for each frame. For example, the user B has been assigned to the grid 2 (602) to the grid 3 (604) in the first frame, but may be assigned to the grid 1 (600) to grid 2 (602) in the next frame.

7 is a block diagram of a terminal for selecting and receiving only a band required by a user according to the present invention.

As illustrated in FIG. 7, the receiver includes an RF unit 701, a reception filter 703, an analog / digital converter 705, a fast fourier transform (FFT) operator 707, a digital filter 709, and subcarrier demapping. And a demodulator 713 and a decoder 715.

First, the RF unit 701 frequency-down the high frequency band signal received through the antenna to the baseband signal, and outputs an analog baseband signal. Receive filter 703 filters the grid assigned to the receiver in the analog baseband signal. Here, the reception filter 703 should be able to receive the width of the grid assigned to the receiver.

The analog / digital converter 705 converts the filtered analog signal into a digital signal and outputs the digital signal. Here, the digital signal is time sample data.

Thereafter, after converting the digital signal into parallel data, the FFT converter 707 receives the parallel data and performs fast Fourier transform to output data in a frequency domain.

The digital filter 709 filters the fast Fourier transformed signal to remove subcarriers corresponding to the frequencies of adjacent gratings.

The subcarrier demapper 711 extracts subcarrier values carrying actual data from the subcarrier values provided from the digital filter 709. Further, according to the present invention, the digital filter 709 filters only the grid assigned to the receiver to detect data of the receiver assigned to the grid using channel allocation information of the grid.

The demodulator 713 demodulates and outputs the data provided from the subcarrier demapper 711 in a corresponding demodulation scheme, and the decoder 715 performs channel decoding on the data demodulated by the demodulator 713 at a corresponding code rate. Restore the data.

The operation of the receiver of FIG. 7 will be described as the operation of a receiver receiving one grid and a receiver receiving two grids as shown in FIG. 8.

8 illustrates a structure in which a user selects only a required band according to an embodiment of the present invention. In the following description, a receiver receiving one grating and a receiver receiving two gratings are described by way of example in the frequency domain. In addition, it is assumed that one grating consists of 200 subcarriers.

As shown in FIG. 8, the first connection of the receiver is connected to one of several carriers spaced apart from the grid. In this case, the receiver 801 using an odd number of grids as a bandwidth uses an intermediate frequency of each grid as a carrier frequency (step 803). If the receiver 811 uses an even number of grids as its bandwidth, the receiver 811 uses the boundary frequency between the grids as the carrier frequency (813).

The signal of user 1 801 using one grating is transmitted to the K-1 th grating, and the signal of user 2 811 using two gratings is transmitted to the K + 1 and K + 2 gratings. In this case, the receiver of the user 1 801 performs a reception filter capable of receiving the width of the one grid and an analog / digital conversion corresponding to the bandwidth of the reception filter to receive one grid (200 subcarriers). Perform 805. User 2 811 also performs an analog / digital conversion and a reception filter for receiving two grids (400 subcarriers) (815).

Subsequently, the FFT (Fast Fourier Transform) transformation (User 1: 256 FFT, User 2: 512 FFT) of the filtered and analog / digital converted signal is performed, and then subcarriers corresponding to edges of bandwidths corresponding to signals of adjacent grids are obtained. Elimination through digital filtering (807, 817).

9 illustrates a procedure for receiving only data of a band allocated to a receiver in a wideband transmission signal according to an embodiment of the present invention.

Referring to FIG. 9, the receiver first checks whether a signal is received in step 901. When the signal is received, the receiver proceeds to step 903 to acquire time-frequency synchronization using the preamble of the signal (the time-frequency synchronization acquisition process will be described in detail with reference to FIG. 10 below).

Subsequently, the receiver proceeds to step 905 to filter the band allocated to the receiver through the reception filter 703 of FIG. 7 which may include a grid allocated to the receiver as in steps 805 and 815 of FIG. 8. After that, the filtered signal is analog-to-digital converted.

After the fast Fourier transforming of the filtered and analog / digital converted signal, the receiver proceeds to step 907 to remove the subcarrier corresponding to the frequency of the adjacent grid using the digital filter 709 of FIG. Receive only the assigned grid.

After receiving only the grid allocated to the receiver, the receiver proceeds to step 909 to check channel allocation information of the grid allocated to the receiver to confirm information to which the receiver's data is allocated in the grid. For example, the user A 611 of FIG. 6 checks the channel allocation information 701 of the grid 1 600 so that the data A-1 of the user A 611 is not included in the grid 1 600. The allocated information is checked (613).

Thereafter, the receiver proceeds to step 911 to receive the data using the channel allocation information of the data identified in step 909, and then the receiver proceeds to step 913 to restore the data. The receiver then terminates this algorithm.

A process of receiving data using a grid allocated to a receiver in a wideband transmission signal as shown in FIG. 9 is assumed to receive a frame transmitted by splitting and assigning each grid in FIG. 6 as follows.

First, the receivers of the users (users A, B, and C) identify the lattice assigned to them in the wideband transmission signal as shown in FIG. 8. For example, user A is assigned to each user, such as grid 1 (600), user B is grid 2 to grid 3 (602 to 604), and user C is grid 1 to grid 3 (600, 602, 604). Check the grid.

Thereafter, the user A checks the channel allocation information 601 of the grid 1 600 to receive the data A-1 (613), and the user B of the grid 2 602 and the grid 3 (604) Channel allocation information 603 and 605 is checked to receive data B-1 and B-2 (623 and 624). In addition, the user C checks the channel assignment information 601, 603, and 605 of the grid 1 600, the grid 2 602, and the grid 3 604, and the data C-1, C-2, and C-3. , C-4 (633, 634, 635, 636).

10 illustrates a structure for detecting synchronization of a receiver according to an embodiment of the present invention. In the following description, the synchronization is detected using a preamble structure consisting of a signal repeated in the time domain and a sliding correlator. It is also assumed that receiver 1 receives grid 1 and receiver 2 receives grids 1-2.

As shown in FIG. 10, when the same preamble is repeated twice during two symbols, FIG. 10A shows a preamble 1001 in a time domain having bandwidths corresponding to two grids. When the preamble 1001 of FIG. 10A is sampled by the first receiver 1003 and the second receiver 1005, respectively, the preamble 1001 is sampled as shown in FIGS. 10B and 10C. That is, since the bandwidth of the second receiver 1005 is twice the bandwidth of the first receiver 1003, the sampling frequency is twice as large.

Subsequently, when the sliding correlator is used to acquire the synchronization, the preamble 1001 repeats the same signal in the time domain, and thus the output of the sliding correlator is shown as shown in FIGS. 10D and 10F. Here, since the synchronization is obtained using the peak value of the output of the sliding correlator, if there is a receiver receiving N grids, the receiver has a new preamble composed of the sum of the preambles of the N grids, but in the time domain It is also a repeated preamble. Thus, synchronization is obtained with a sliding correlator having the same structure but having a rate of N times.

As described above, when a system that divides a frame into a grid shape and supports a receiver having various bandwidths is applied to a cellular system, the receiver receives a synchronization to the cell with the synchronization acquisition of FIG. Cell search to recognize the inclusion is an important issue.

11 shows a structure for searching for a cell according to an embodiment of the present invention. In the following description, a method of searching for a cell by detecting a code in a frequency domain is described as an example.

Referring to FIG. 11, when a cell ID code exists in a frequency domain in one grid, the receiver performs fast Fourier transform and performs cell search through a correlator in the frequency domain after time synchronization is acquired.

As shown in FIG. 11, the same code may be repeated for each grid, and different grids may use different codes.

If cell search is possible within one grating, cell search is possible even if multiple grating receivers correlate only one grating length in the frequency domain. In addition, when the length of the correlator is increased, the signal-to-noise ratio of the correlator output is increased compared to one grating receiver, thereby improving cell search performance.

As described above, data is divided and allocated to each grid by dividing one band into grids, and communication is possible without interference between adjacent grids by including channel allocation information for each grid. Therefore, communication is possible without using different frequency allocations or inserting guard bands to protect bands between carriers, thereby enabling frequency integration among multiple operators.

In addition, when the communication system of the transceiver having the different bandwidth is applied to the mobile communication system, base stations having different bandwidths are mixed because the number of grids of the base station to which the terminal transmits the grid allocated to the terminal is independent. It is possible to plan a cell of a mobile communication system with a communication system.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, in the wireless communication system, by providing a frame structure for performing partial reception at the receiver between the transceiver having a different bandwidth, that is, the broadband transmitter and the receivers having various bandwidths, the flexibility of the communication system It is possible to support various types of services by maximizing the number of communication systems, and also enables communication systems in which base stations having different bandwidths are mixed, thereby maximizing flexibility in cell planning of mobile communication systems.

Since no guard band is required on the frequency spectrum, the entire frequency spectrum of the system can be used. Therefore, frequency efficiency can be maximized by integrating frequency spectrum allocated by various operators.

Claims (26)

A transmitting apparatus of a wireless communication system using all frequency resources by dividing one or more transmitting / receiving frequency minimum units, A subcarrier mapper for dividing and assigning data to be transmitted to receivers having various bandwidths into the minimum transmission / reception frequency unit and inserting channel allocation information of the data into the minimum transmission / reception frequency unit; And an inverse fast fourier transform (IFFT) for data mapped to the subcarriers. The method of claim 1, An encoder for receiving information data from a medium access control (MAC) layer and encoding at a predetermined code rate, And a modulator for modulating the data encoded by the encoder by a predetermined modulation scheme and providing the modulated data to the subcarrier mapper. 3. The method of claim 2, The predetermined modulation scheme is any one of Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (16QAM), and 64 Quadrature Amplitude Modulation (64QAM). Transmitting device. The method of claim 1, The minimum transmission and reception frequency unit, A transmission apparatus of a wireless communication system having a flexible size by a scheduler and including preamble and channel assignment information. The method of claim 4, wherein And the channel allocation information has a flexible size according to the amount of data allocated to the minimum transmission / reception frequency unit. The method of claim 1, The subcarrier mapper, A channel assignment information inserter for inserting channel allocation information of data divided and allocated to the minimum transmission / reception frequency unit into each minimum transmission / reception frequency unit; And a data allocator for dividing and allocating data to be transmitted to the receivers in the minimum transmission / reception frequency units. The method of claim 1, A control signal for grasping the bandwidths of the receivers and the amount of data to be transmitted to the receivers and dividing the data into minimum transmission / reception frequency units allocated to the receivers; And a subcarrier mapper generating a control signal for inserting channel allocation information of data allocated to each of the minimum transmission / reception frequency units. The method of claim 1, A digital / analog converter for converting the output signal of the IFFT operator into an analog signal; And a RF processing unit converting the baseband analog output signal of the digital / analog converter into a radio frequency (RF) signal and outputting the RF signal to the terminal through an antenna. The method of claim 1, And a guard band does not exist between the minimum transmission / reception frequency units having different frequency characteristics. A reception apparatus of a wireless communication system for dividing an entire frequency resource into one or more transmission / reception frequency minimum units, An FFT operator for fast Fourier transform (FFT) of the received signal, A filter unit which removes adjacent subcarriers of the minimum transmission / reception frequency unit from the fast Fourier transformed signal; And a subcarrier demapping unit for extracting actual data for each minimum transmission / reception frequency unit by using channel allocation information existing for the minimum transmission / reception frequency unit in the output signal of the filter unit. The method of claim 10, The minimum transmission and reception frequency unit, A receiving apparatus of a wireless communication system, characterized by a flexible size by a scheduler, and including preamble and channel assignment information. The method of claim 11, And the channel allocation information has a flexible size according to the amount of data allocated to the minimum transmission / reception frequency unit. The method of claim 10, RF (Radio Frequency) unit for converting the received signal into a baseband signal by frequency down; A reception filter unit for filtering a minimum transmission / reception frequency unit allocated to the reception device from the baseband signal; And an analog / digital converter converting the analog output signal of the reception filter into a digital signal and providing the same to the FFT operator. The method of claim 10, And a synchronization acquisition unit for obtaining synchronization using a preamble included in the minimum transmission / reception frequency unit allocated to the reception device. The method of claim 10, A reception device of a wireless communication system, characterized in that no guard band exists between the minimum transmission / reception frequency units having different frequency characteristics. In the transmission method of a wireless communication system using all frequency resources divided by one or more transmission and reception frequency minimum unit, Checking the bandwidth of receivers to transmit data and the amount of data to transmit to the receivers; Allocating the minimum transmission / reception frequency unit according to the bandwidth of each receiver, updating the channel allocation information of the data to be divided and allocated to the minimum transmission / reception frequency unit; And dividing the data according to the channel allocation information and allocating the data to each transmission / reception frequency minimum unit. The method of claim 16, The minimum transmission and reception frequency unit, And a preamble and channel allocation information having a flexible size by the scheduler. The method of claim 17, And the channel allocation information has a fluid size according to the amount of data allocated to the minimum transmission / reception frequency unit. The method of claim 16, The minimum unit of the transmission / reception frequency allocated to each receiver may be changed for each frame. The method of claim 16, And a guard band does not exist between the minimum transmission / reception frequency units having different frequency characteristics. In the receiving method of a wireless communication system using all frequency resources by dividing one or more transmission frequency minimum unit, Detecting only a minimum unit of a transmission / reception frequency allocated to the receiver; Checking channel allocation information of each of the minimum transmission / reception frequency units allocated to the receiver; And identifying data allocated to each of the minimum transmission / reception frequency units according to the channel allocation information. 22. The method of claim 21, The minimum transmission and reception frequency unit, And a preamble and channel allocation information having a flexible size by the scheduler. 23. The method of claim 22, And the channel allocation information has a fluid size according to the amount of data allocated to the minimum transmission / reception frequency unit. 22. The method of claim 21, And acquiring time-frequency synchronization using the preamble of the received signal. 22. The method of claim 21, Detecting only the minimum transmission / reception frequency unit allocated to the receiver, Converting the filtered analog signal into a digital signal after filtering the transmission / reception frequency minimum unit allocated to the receiver from the received signal; And removing subcarriers included in the adjacent transmission / reception frequency minimum unit from the digital signal. 22. The method of claim 21, The guard band is characterized in that there is no guard band between the minimum transmission and reception frequency units having different frequency characteristics.

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