KR100846171B1 - Apparatus and Materialization Method for Multi-Antenna Modulation in Downlink OFDMA Wireless Systems - Google Patents

Abstract

The present invention relates to a multi-antenna modulation apparatus and an implementation method for downlink OFDMA wireless communication.

To this end, the present invention comprises a DTP processing unit for generating a DTP symbol value by mapping downlink data to a transmission antenna of a plurality of antennas; An index mapper for mapping a DTP symbol value received from the DTP processor to the number of bits for transmission; A scrambler for performing a scrambling operation to randomly inter-cell interference of downlink data transmitted through the index mapper; A virtual carrier inserter for filling virtual data into empty space of scrambled downlink data; An IFFT unit performing an inverse Fourier transform operation for converting data transmitted from the virtual carrier inserter into a signal on a time axis; And a CP insertion unit that adds a cyclic prefix to the inverse Fourier transformed downlink data.

According to the present invention, a base station modulation apparatus of an OFDMA system for transmitting downlink data using multiple antennas and multiple carriers simultaneously can be implemented.

OFDMA, downlink, downlink, modulator, transmitter, antenna mapping

Description

Apparatus and Materialization Method for Multi-Antenna Modulation in Downlink OFDMA Wireless Systems}

1 illustrates a downlink frame structure of an OFDMA system;

2 is a diagram illustrating the function and design specifications of a downlink OFDMA multi-antenna modulator;

3 is a table illustrating an antenna mapping method according to an AMC option;

4 is a block diagram schematically illustrating a base station transmitter in an OFDMA system according to an embodiment of the present invention;

5 is a block diagram illustrating a timing control group of a downlink OFDMA multi-antenna modulator block according to an embodiment of the present invention;

6 is a diagram showing a transport packet according to an antenna mapping scheme for performing SFBC;

7 is a diagram illustrating a transport packet according to an antenna mapping method for performing SPEX;

8 is an exemplary view showing in detail an index for transmitting multiple antennas;

9 is a view briefly illustrating an internal configuration of a virtual carrier insert for inserting a virtual carrier according to an embodiment of the present invention;

10 is a view briefly illustrating an internal configuration of an IFFT unit for inverse Fourier transform according to an embodiment of the present invention;

11 is a view briefly illustrating an internal configuration for calculation in a CP insertion unit according to an embodiment of the present invention;

12 is a diagram illustrating in more detail the configuration of a downlink OFDMA multi-antenna modulator and peripheral devices according to an embodiment of the present invention.

The present invention relates to a multi-antenna modulation apparatus and an implementation method for downlink OFDMA wireless communication. More specifically, the present invention relates to an operation method and an implementation method of a multi-antenna modulation apparatus supporting a downlink frame structure used in an OFDMA system using multiple carriers and multiple transmit antennas.

In the 4th generation mobile communication systems requiring large data transmission such as WLAN, wireless broadcasting, and DMB, the OFDMA method is used to transmit broadband high speed data.

The OFDMA method divides the frequency bands of channels having different gain and noise effects according to the frequency into several pieces, and allocates the appropriate number of data bits to each band and transmits them. This is a method of increasing the data rate by converting the data into a subcarrier and transmitting the data on a separate subcarrier.

In the OFDMA system supporting the OFDMA scheme, data is transmitted between a base station and a terminal. The data is transmitted through a downlink frame in transmitting data from the base station to the terminal, and the uplink frame is transmitted in transmitting data from the terminal to the base station. Transfer data through

 In the mobile communication system using the same OFDMA scheme, in order to improve the efficiency of downlink data transmission, a multi-input multi-out (MIMO) scheme is used in which a base station transmitter including a plurality of antennas transmits different data using respective antennas. It is used. With the use of the MIMO scheme, diversity gain can be obtained in an OFDMA system, and the data rate can be increased.

1 illustrates a downlink frame structure of an OFDMA system.

The downlink frame of the OFDMA system includes a cell common packet (CCP) including information on data to be transmitted and a downlink traffic packet (DTP) for data transmission. DTP ').

CCP is a preamble for data transmission and a signal sequence section for synchronous acquisition, and includes a CCPP including a preamble, a PGICH, which is a paging index channel, and a DSFICH, which is a multiple antenna and pilot interval indication channel.

The DTP includes 12 packet sections from DTP # 1 to DTP # 11 for 12 data transmissions. Each DTP includes DTP-PICH, CCPCH, SPCCH, SCPCH, SPDCH.

The DTP-PICH is a downlink physical channel that transmits a predetermined symbol sequence at a fixed rate within the DTP. There can be up to two DTP-PICHs in one cell. One DTP-PICH is composed of 3071 / N _PS pieces. In this case, 'lo' is a unit representing a pilot symbol interval.

CCPCH is a downlink physical channel that transmits various transport channels at a fixed rate within the DTP. There may be 12 CCPCHs in one DTP. One CCPCH consists of 32 symbols, and one symbol transmits 2 bits of data.

SPCCH is a downlink physical channel for transmitting signaling information related to the transmission of the SPDCH at a fixed rate in DTP. One SPCCH may be transmitted through one DTP, and one symbol transmits two bits of data.

SCPCH is a downlink physical channel that transmits a downlink SCH transport channel at a fixed rate within a DTP. There are 12 SCPCHs in one DTP. One SCPCH consists of 32 symbols, and one symbol carries two bits of data.

The SPDCH is a downlink physical channel that transmits a downlink transport channel at a variable rate within the DTP. A maximum of one downlink SPDCH may exist in one DTP, and one SPDCH includes 1024 symbols. Each symbol may be selectively modulated among Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (QAM), and 64 QAM.

Here, one downlink frame is transmitted through a time of 12.3 ms, CCP is transmitted through 0.3 ms, and 12 DTPs are transmitted through a time of 1 ms, respectively.

2 is a diagram illustrating the function and design specifications of a downlink OFDMA multi-antenna modulator.

Currently, a modulator for transmitting downlink data through multiple antennas using MIMO technology in OFDMA has a standard as shown in FIG. 2.

The downlink modulator in the OFDMA system uses a 100M Bps MIMO-class modem and transmits the physical channels of CCPP, DSFICH, PGICH, SPCCH, CCPCH, SCPCH, and SPDCH, as described above with reference to FIG. 1. At this time, the number of channels of the SPDCH should be within 12.

A single antenna transmission (SAT), a spatial frequency block code (SFBC), and a spatial expansion (SPEX) are used as the antenna coding scheme. Here, SAT is a method of transmitting downlink data using only one antenna, SFBC is a method of transmitting downlink data using two antennas in diversity mode, and SPEX is a method of multiplexing two antennas. This method is used to transmit downlink data.

Adaptive Modulation & Coding (AMC) may be variously selected according to channel conditions. Here, the AMC options that can be used are shown in FIG. 3. However, current modulators are based on baud rate: 1 (QPSK, SAT / SFBC), 3 (16 QAM, SAT / SFBC), 4 (QPSK, SPEX), 7 (16 QAM, SAT / SFBC) ), 8 (16 QAM, SPEX), 12 (16 QAM, SPEX) and 15 (64 QAM, SPEX) are set to select one of the AMC options.

Cell Group Number (CGN) / CN (Cell Number) relates to a cell group number and cell number in a multi-cell environment, and is set to support 8 cells from 0 to 7, respectively, and total 64 cells It is set to support.

Using such a standard, in implementing a modulator of a downlink OFDMA multiple antenna for transmitting downlink data, it is difficult to actually implement a modulator to which both an OFDMA scheme and a MIMO scheme are applied. The modulation unit of the MIMO transmitter using the scheme is implemented or the modulation unit of the OFDMA transmitter for transmitting downlink data through one antenna without MIMO is used.

In order to solve such a problem, the present invention provides a base station modulation apparatus and an implementation method of an OFDMA system for transmitting a downlink frame using multiple antennas and multiple carriers.

In order to achieve the above technical problem, a base station modulation apparatus according to the present invention is a base station modulation apparatus of an OFDMA system for transmitting downlink data using multiple antennas and multiple carriers, by mapping downlink data to a transmission antenna among a plurality of antennas. A DTP processor for generating a DTP symbol value; An index mapper for mapping a DTP symbol value received from the DTP processor to the number of bits for transmission; A scrambler for performing a scrambling operation to randomly inter-cell interference of downlink data transmitted through the index mapper; A virtual carrier inserter for filling virtual data into empty space of scrambled downlink data; An IFFT unit performing an inverse Fourier transform operation for converting data transmitted from the virtual carrier inserter into a signal on a time axis; And a CP insertion unit that adds a cyclic prefix to the inverse Fourier transformed downlink data.

In addition, the base station transmitting apparatus according to the present invention is a base station transmitting apparatus of an OFDMA system for transmitting downlink data using multiple antennas and multiple carriers, comprising: a control connector for performing channel encoding of downlink data; A modulator for modulating the downlink data transmitted from the control connector and mapping the modulated downlink data to each antenna of the multiple antennas; And a transmission connector converting downlink data mapped to each antenna by a modulator into a digital IF signal or an RF signal and transmitting the converted downlink data.

In addition, the method for transmitting downlink data according to the present invention is a method for transmitting downlink data using multiple antennas and multiple carriers in a base station transmitter of an OFDMA system, the method comprising the steps of: (a) performing channel encoding of downlink data; ; (b) mapping channel encoded downlink data to multiple antennas; (c) inverse Fourier transforming downlink data mapped to multiple antennas; (d) adding a cyclic prefix to the inverse Fourier transformed downlink data; And (e) converting downlink data to which the cyclic prefix is added, into a digital IF signal or an RF signal and transmitting through each mapped antenna.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

In addition, when a part is said to "include" a certain component, this means that it may further include other components, except to exclude other components unless otherwise stated.

In addition, the term module described herein refers to a unit for processing a specific function or operation, which may be implemented in hardware or software, or a combination of hardware and software.

4 is a block diagram schematically illustrating a base station transmitter in an OFDMA system according to an embodiment of the present invention.

The base station transmitting end of the OFDMA system according to the present invention includes a modulator 410, a control connector 420, a memory 430 and a transmission connector 440, the control connector 420 is a hardware component 422, a hardware control unit 424 and encoder 426, and transmit connector 440 includes D-IF / RF interface 442 and demodulator 444.

The modulator 410 is a type of field-programmable gate array (FPGA). The modulator 410 receives a downlink data to be transmitted under the control of the control connector 420, modulates it, and transmits it through the transmission connector 440. Here, the modulator 410 includes a symbol mapper for mapping the received data to a transmission symbol for transmitting downlink data through a plurality of antennas, and a multi-antenna mapper for mapping the symbols to be transmitted to each antenna. Here, the symbol mapper and the multi-antenna mapper will be described in detail with reference to FIGS. 5 and 6.

The modulator 410 includes a hardware component 422, a hardware controller 424, an encoder 426, a memory 430, a D-IF / RF interface 442, and a demodulator 444 for transmitting downlink data. Send and receive various data bits.

The hardware component 422 constitutes a platform of the base station transmitter, and the modulator 410 uses a pulse synch clock, a frame synch clock, a system clock, and a frame number serial. Data (Frame Number Serial Data), Reset, and the like are transmitted, and operation state information of the modulator is received from the modulator 410.

The hardware controller 424 is a type of digital signal processor (DSP) that controls the base station transmitter. The hardware controller 424 transmits control information such as chip information, output enable, byte information, read / write information, and address to the modulator 310, and modulator 310. A data bus signal, an interrupt request signal, a busy signal, and the like are received from the 310.

A channel encoder 426 performs channel encoding of the data processed in the previous FPGA and transmits it to the modulator 410. The encoder 426 transmits data, an address, chip information, output information, byte information, read / write information, and the like to the modulator 410.

At this time, a memory 430 is located between the encoder 426 and the modulator 410 to store the data to be transferred.

The memory 430 is a dual port random access memory (DPRAM), and includes a CCPCH to be transmitted, an area for storing the SCPCH, an area for storing the SPCCH, and an area for storing the SPDCH.

The D-IF / RF interface 442 converts downlink data transmitted into digital IF signals or RF signals and transmits them through a plurality of antennas. To transmit downlink data through two antennas, the D-IF / RF interface 442 receives a first antenna signal and a second antenna signal from the modulator 410. Here, the first antenna signal and the second antenna signal each consist of an 8-bit I signal and a Q signal.

The demodulator 444 is a part for demodulating the signal received through the antenna. During downlink transmission, the demodulator 444 demodulates a loop back signal and transmits the demodulated loop-back signal to the modulator 410. Here, the loop-back signal is a signal which is demodulated through the demodulator 444 and then transmitted to the modulator 410 in order to test whether an error occurs with respect to a signal to be transmitted from the base station.

The base station transmitter in the OFDMA system configured as described above may use the SFBC scheme and the SPEX scheme in transmitting downlink data through two antennas connected to the D-IF / RF interface 442.

The DTP symbol value transmitted from the memory 430 is mapped to CCPCH, SCPCH, SPCCH and SPDCH by the symbol mapper, respectively, and each of the mapped channels is transmitted to each antenna (first antenna and second antenna) through the multi-antenna mapper. Is assigned. At this time, the mapping scheme of the SPDCH is different according to the antenna mapping scheme. Here, each antenna mapping method will be described in detail with reference to FIGS. 6 to 7.

5 is a block diagram illustrating a timing control group of a downlink OFDMA multi-antenna modulator block according to an embodiment of the present invention.

The downlink OFDMA multi-antenna modulator according to the present invention includes a DTP processor 510 and a plurality of antenna data processors.

Here, the antenna data processor includes the same number as the number of antennas of the base station transmitter, the index mappers 520 and 522, the scramblers 530 and 532, the virtual carrier inserters 540 and 542, and the inverse Fourier transform unit 550. 552, buffers 560, 562, and CP inserters 570, 572.

The DTP processor 510 includes a bit reading unit 5110, a multi-dimensional mapping and channel generator 5120, a buffer mapping unit 5130, a DTP buffer 5140, and a register controller 5150.

The bit reading unit 5110 reads and confirms downlink data transmitted from the DPRAM 430. Also, the DPRAM 430 is controlled to receive and read downlink data.

The multidimensional mapping and channel generation unit 5120 maps bit-type downlink data transmitted from the bit reading unit 5110 into symbol-type data so as to be transmitted through each antenna. This is the part to create and input the channel to be sent.

In this case, since downlink data to be transmitted to two antennas are simultaneously mapped in symbol form, it is referred to as multidimensional mapping.

The downlink data mapped and channel-generated for each antenna by the multidimensional mapping and channel generator 5120 is stored in each DTP buffer 5140. In this case, the downlink data mapped by the multidimensional mapping and channel generator 5120 and generated by the channel is mapped to and stored in the DTP buffer 5140 set to each antenna by the buffer mapping unit 5130. The buffer mapping unit 5130 maps downlink data values to be transmitted to the respective antennas to the respective buffers according to a predetermined rule.

The register controller 5150 generates and provides register values used for multi-dimensional mapping, channel generation, and mapping to the DTP buffer 5140.

Various register values are required for the multi-dimensional mapping, the channel generation, and the mapping by the buffer mapping unit 5130. Register values for this purpose are generally used by receiving register values from the hardware configuration unit 422, hardware control unit 424, or DPRAM 430, but in addition to the register values received from them, multi-dimensional mapping, channel generation and buffer mapping units ( The register values necessary for the mapping operation by 5130 are generated and provided by the register controller 5150.

The antenna mapping by SFBC or SPEX, which will be described later, is performed by the DTP processor 510 as described above with reference to FIGS. 6 and 7.

The index mappers 520 and 522 sequentially perform resource mapping (RM), logical mapping (LM), and frequency time mapping (FTM), from the DTP processor 510. It serves to map the transmitted downlink data, that is, the DTP symbol value to the number of bits for transmission. Typically, since the number of data bits transmitted from the DTP processor 510 is 12 bits, the index mappers 520 and 522 map the received data bits to 15 bits, which are transmission data bits.

The scramblers 530 and 532 scramble downlink data transmitted from the index mapper 520 and 522. Data scrambling is a task performed to maximize data demodulation performance in a mobile terminal receiving downlink data by randomizing inter-cell interference.

The Virtual Carrier Insertion (VC Insertion) (540, 542) includes a virtual carrier (usually '0') in which empty spaces generated when downlink data is input to a downlink frame composed of a frequency axis and a time axis. 'This is the part that fills with data). Here, an operation method of the virtual carrier insertion units 540 and 542 will be described in detail with reference to FIG. 9.

The Inverse Fast Fourier Transform (IFFT) (550, 552) of the inverse Fourier transform (IFFT) (550, 552) is a signal of the time axis by using the Fourier transform (Fourier) signal received from the virtual carrier insertion section (540, 542) This is the part that performs the conversion. Here, an operation method of the IFFTs 550 and 552 will be described in detail with reference to FIG. 10.

The buffers 560 and 562 temporarily store downlink data on which inverse Fourier transform has been performed.

The CP insertion units 570 and 572 add a cyclic prefix (CP) to the front end of a signal for transmitting downlink data stored in the buffers 860 and 860. Here, the CP insertion units 570 and 572 will be described in detail with reference to FIG. 11.

The downlink data into which the CP is inserted by the CP insertion units 570 and 572 is converted into a digital IF signal (D-IF) or an RF signal and transmitted through each antenna.

Here, the antenna mapping by SFBC or SPEX performed by the DTP processor 510 will be described.

6 is a diagram illustrating a transport packet according to an antenna mapping scheme for performing SFBC.

Since SFBC tries to obtain diversity gain by repeatedly transmitting the same data channel through two antennas, the same data value is copied to the first antenna and the second antenna. Accordingly, the DTP symbol values transmitted from the memory 430 are mapped to CCPCH, SCPCH, SPCCH, and SPDCH by the symbol mapper, respectively, and the same values are transmitted to the first antenna and the second antenna by the multi-antenna mapper, respectively.

In case of SFBC, after the symbol mapping is performed, the first antenna (antenna # 1) and the second antenna (antenna # 2) have a relationship as shown in Equation 1 while changing the symbol index value by two. Pass data).

This is represented by Equation 1 as a data transfer equation.

SPDCH [symbol index] [antenna # 1] <= SPDCH [symbol index]

SPDCH [symbol index] [antenna # 2] <= SPDCH [symbol index + 1];

SPDCH [symbol index + 1] [antenna # 1] <= (-1) * Conj (SPDCH [symbol index + 1])

SPDCH [symbol index + 1] [antenna # 2] <= (+1) * Conj (SPDCH [symbol index]);

Accordingly, the data of CCPCH, SCPCH, SPCCH and SPDCH transmitted to the first antenna and the second antenna have the same value.

FIG. 7 is a diagram illustrating a transport packet according to an antenna mapping scheme for performing SPEX (SPatial Expansion).

The data received from the memory 430 at the SPEX has twice the capacity of the SFBC scheme. In the antenna mapping method for performing SPEX, data is alternately distributed to each of the symbol intervals between the first antenna and the second antenna. Accordingly, the SPDCH of the signal passing through the symbol mapper has twice the data of the SPDCH in SFBC as shown in FIG.

In the case of the SPEX, data is alternately transmitted to the first and second antennas while the symbol index is changed by two. At this time, the symbol index 'has half the value of the symbol index before performing the antenna mapping.

This is represented by Equation 2 as a data transfer equation.

SPDCH [symbol index] [antenna # 1] <= SPDCH [symbol index ']

SPDCH [symbol index + 1] [antenna # 2] <= SPDCH [symbol index ']

Data mapped to the first antenna and the second antenna by the multi-antenna mapper have SPCCH, CCPCH, and SCPCH having the same value, but SPDCH transmitted through the first antenna and SPDCH transmitted through the second antenna have different values. Will have

8 is an exemplary view showing in detail an index for transmitting multiple antennas.

The gain value can be obtained from the hardware controller according to the set value of the signal output from the transmitter. Allocate 4 bits for gain control and set '0100' to the register of each channel to get the same gain.

On the other hand, SFBC and SPEX is to obtain the diversity (diversity) or multiplexing (Multiplexing) effect, and does not need to adjust the gain, so the gain adjustment function for each antenna is not necessary.

After gain adjustment, each of CCPP, DSFICH, PGICH, CCPCH, SCPCH, SPCCH, and SPDCH is mapped to an OFDM symbol interval of 0.1 ms and 1536 symbols, and then mixed by performing a separate frequency index operation as shown in FIG. , Hopping effect occurs.

The channel corresponding to the CCP and the DTP-PICH channel are generated separately by the base station modulator. When CCPCH and SCPCH perform index calculation, the time point allocated to DTP for each subchannel is different so that the corresponding DTP can be identified. That is, each subchannel is set to read data alternately with the corresponding memory.

In the case of SPCCH, the index calculation method is similar to that of CCPCH and SCPCH. However, since the size of the data read from the previous coding section varies according to the AMC option, separate processing is required for each case.In order to improve the data processing speed, grouping 6 channels for 12 subchannels of 12 SPDCHs in parallel Set to process. At this time, a separate memory may be set for each accessory channel, and the reading order may be changed in a predetermined pattern so that a hopping effect may occur.

In addition, the data reflected by the index operation is replaced with the front part and the rear part by time-frequency mapping, and scrambled every 0.1 ms OFDM symbol period.

9 is a view briefly illustrating an internal configuration of a virtual carrier insert for inserting a virtual carrier according to an embodiment of the present invention.

The virtual carrier insertion units 540 and 542 include a virtual carrier insertion control block 910 and a VC_ins_iq mapping block 920.

The virtual carrier insertion control block 910 receives a reset signal Reset_n, a clock signal Clock_50Mhz, a local count signal, a scrambled I signal scram_i, and a scrambled Q signal scram_q from the scramblers 530 and 532. ) And a channel mapping operation signal (m_en / channel, m_no / channel) and a virtual carrier is inserted into an empty space of downlink data. Typically, the virtual carrier uses data having a value of '0'.

The VC_ins_iq mapping block 920 is a block for appropriately mapping downlink data into which the virtual carrier is inserted by the virtual carrier insertion control block 910 to the I and Q signals.

Accordingly, the outputs of the virtual carrier insertion units 540 and 542 are represented by VC_ins_i and VC_ins_q, and are transmitted to the IFFT units 550 and 552.

10 is a view briefly illustrating an internal configuration of an IFFT unit for inverse Fourier transform according to an embodiment of the present invention.

The IFFT units 550 and 552 include an R-2 ² FFT block 1010 and an IFFT_iq mapping block 1020.

The R-2 ² FFT block 1010 includes a reset signal Reset_n, a clock signal Clock_50Mhz, a local count signal, and an I signal VC_ins_i inserted from the virtual carrier insertion units 540 and 542. A block for performing inverse Fourier transform by receiving a Q signal VC_ins_q inserted with a virtual carrier and IFFT operation signals IFFT_en and IFFT_no, and performing Redix-2 ² FFT.

Here, the Redix-2 ² FFT is a method of performing FFT using 2 ² (4) points, and since it is well known to those skilled in the art, a detailed description of the method of performing FFT will be omitted. .

The IFFT_iq mapping block 1020 is a block that appropriately maps the resultant value of the inverse Fourier transform by the R-2 ² FFT block 1010 to the I and Q signals.

Accordingly, the outputs of the IFFT units 550 and 552 may be represented by IFFT_i and IFFT_q, and the buffers 560 and 562 may include two storage areas for storing IFFT_i and IFFT_q, respectively.

11 is a view briefly showing an internal configuration for the calculation in the CP insertion unit according to an embodiment of the present invention.

CP insertion units 570 and 572 according to an exemplary embodiment of the present invention include a first DPRAM 1110, a second DPRAM 1120, and an address controller 1130.

The first DPRAM 1110 and the second DPRAM 1120 store portions of downlink data transmitted from the buffers 560 and 562, respectively. Accordingly, the same data is stored in the first DPRAM 1110 and the second DPRAM 1120.

The address controller 1130 may call data stored in the first DPRAM 1110 and the second DPRAM 1120 to generate data to be transmitted through an antenna. To generate transmission data, the address controller 1130 first calls data stored from the first DPRAM 1110. The address controller 1130 calls and copies the data stored in the second DPRAM 1120, and then connects the copied data to the back of the data called from the first DPRAM 1110.

The transmission data generated as described above is converted into a digital IF signal (D-IF) or an RF signal by the digital IF module or the RF module and transmitted through each antenna.

12 is a diagram illustrating in more detail the configuration of a downlink OFDMA multi-antenna modulator and peripheral devices according to an embodiment of the present invention.

The modulator 410 of the downlink OFDMA multiple antenna according to the present invention is connected to the encoder 426 of the control connector 420, the D-IF / RF interface 442 of the transmit connector 440, and the switching control unit 1210. do.

The encoder 426 includes a CRC Attacher, a Scrambler, a Channel Encoder, and an Interleaver, and the D-IF / RF Interface 442 transmits a digital IF or RF. It is configured to include a wealth.

Herein, the switching control unit 1210 is a part that receives various channel information and register information from the hardware configuration unit 422, the hardware control unit 424, the DPRAM 430, or the register control unit 5150, and provides them to the modulator 410. .

The modulator 410 according to the present invention includes a DPRAM controller, a symbol mapper and an antenna mapper, an antenna DTP, a PICH generator, a CCP generator, a gain controller, and an index mapper. Index Mapping, Scrambler, Virtual Carrier Insertion (VC Insertion), IFFT, Parallel to Serial, Guard Insertion, Pulse Shaping, Antenna Gain Control (Antenna Gain Controller) and a Tx Rate Control.

The embodiments of the present invention described above are not implemented only through the apparatus and the method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. Implementation may be easily implemented by those skilled in the art from the description of the above-described embodiments.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

As described above, according to the present invention, a base station modulation apparatus of an OFDMA system for transmitting downlink data using multiple antennas and multiple carriers simultaneously can be implemented.

Claims (22)

A base station modulation apparatus of an OFDMA system for transmitting downlink data using multiple antennas and multiple carriers, A DTP processing unit for generating downlink traffic packet (DTP) symbol values by mapping downlink data to be transmitted to each antenna of the multiple antennas; And At least one antenna data processor for modulating the DTP symbol value to generate data transmitted through the mapped antenna Base station modulation device comprising a. The method of claim 1, The antenna data processor, An index mapper for mapping the DTP symbol value received from the DTP processor to the number of bits for transmission; A scrambler for performing a scrambling operation to randomly inter-cell interference of data transmitted through the index mapper; A virtual carrier inserter which fills virtual data in the empty space of the scrambled data; An Inverse Fast Fourier Transform (IFFT) unit for performing an inverse Fourier transform operation for converting data transmitted from the virtual carrier inserter into a signal on a time axis; And CP insertion unit for adding a cyclic prefix (CP) to the inverse Fourier transform data Base station modulation device comprising a. The method of claim 2, The DTP processing unit, A bit reading unit for reading downlink data generated by a control unit of the base station; Generating the DTP symbol value by converting the downlink data of the bit form transmitted from the bit reading unit into symbol form data for transmission, and multi-dimensionally mapping the generated DTP symbol value to one of the multiple antennas A multi-dimensional mapping and channel generator for generating a channel for transmission; A DTP buffer temporarily storing the DTP symbol value generated by the multidimensional mapping and channel generator and then transferring the DTP symbol value to the index mapper; And A buffer mapping unit for mapping the DTP symbol values to DTP buffers set in the multiple antennas Base station modulation apparatus comprising a. delete delete delete delete delete delete delete delete A base station transmitting apparatus of an OFDMA system for transmitting downlink data using multiple antennas and multiple carriers, A control connector for performing channel encoding of the downlink data; A modulator for modulating downlink data transmitted from the control connector and mapping the modulated downlink data to respective antennas of the multiple antennas; And Transmitting connector converting downlink data mapped to each antenna by the modulator into digital IF signal or RF signal and transmitting Base station transmitting apparatus comprising a. The method of claim 12, Memory for storing the pilot channel (CCPCH, SCPCH), control channel (SPCCH) and data channel (SPDCH) of the channel-encoded downlink data transmitted from the control connector, respectively, and provides the modulator to the modulator The base station transmitting apparatus further comprises. delete The method of claim 12, The control connector, An encoder for performing channel encoding of the downlink data; A hardware component configured to configure a platform of the base station transmitting apparatus and to receive a modulator operation state from the modulator; And Hardware control unit for overall control of the base station transmitter Base station transmitting apparatus comprising a. The method of claim 12, The send connector, A D-IF / RF interface for converting downlink data mapped to each antenna by the modulator into a digital IF signal or an RF signal and transmitting the converted data; And A demodulator for demodulating a loop-back signal for performing an error test on the uplink data and the downlink data received through the multiple antennas and transmitting the demodulated loop back signal to the modulator; Base station transmitting apparatus comprising a. delete A method for transmitting downlink data using multiple antennas and multiple carriers in a base station transmitter in an OFDMA system, (a) performing channel encoding on the downlink data; (b) mapping the channel encoded downlink data to each antenna of the multiple antennas, and then performing inverse Fourier transform on the downlink data mapped to each antenna; And (c) converting the inverse Fourier transformed downlink data into a digital IF signal or an RF signal and transmitting through each of the mapped antennas Downlink data transmission method comprising a. The method of claim 18, Step (b) is, (b1) mapping the channel encoded downlink data to the multiple antennas, respectively; And (b2) inverse Fourier transforming downlink data mapped to each of the multiple antennas Downlink data transmission method comprising a. The method of claim 19, Between the step (b1) and the step (b2), (b11) randomly inter-cell interference of downlink data mapped to the multiple antennas through a scrambling operation; And (b12) filling virtual data into empty space of the scrambled downlink data; Downlink data transmission method characterized in that it further comprises. The method of claim 19, Step (b1), A spatial frequency block code (SFBC) scheme in which the same downlink data is transmitted in the multiple antennas using a diversity mode; SPEX (Spatial Expansion) scheme in which different downlink data is transmitted in the multiple antennas using a multiplexing scheme And transmitting the channel encoded downlink data to the multiple antennas using one of the methods. The method of claim 18, Step (c) is, (c1) adding a cyclic prefix (CP) to the inverse Fourier transformed downlink data; And (c2) converting the downlink data added with the cyclic prefix into a digital IF signal or an RF signal and transmitting the same through the mapped antennas; Downlink data transmission method comprising a.

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