KR100926570B1 - Modulation apparatus and method of base station - Google Patents

Abstract

The present invention relates to a modulation apparatus and a method of a base station. A modulation apparatus of a base station including at least one antenna for transmitting a corresponding downlink symbol to each of a plurality of sectors sequentially acquires and controls a plurality of sector-specific control information. According to the information, a physical channel including any one of a physical control channel and a transmission channel is generated, the physical symbols are sequentially modulated, and the downlink symbols corresponding to the at least one antenna are respectively used by using the result of modulating the physical channel. Create

LTE, base station, modulation

Description

Apparatus and method for modulation of base station

The present invention relates to a modulation apparatus and method of a base station, and more particularly, to a modulation apparatus and method of a base station of a mobile communication system.

The present invention is derived from the research conducted as part of the IT growth engine technology development project of the Ministry of Information and Communication and the Ministry of Information and Communication Research and Development. [Task Management Number: 2005-S-404-13, Project Name: 3G Evolution Wireless Transmission Technology] .

The third generation (3G) Long Term Evolution (LTE) mobile communication system, which is a strong candidate for the fourth generation (4G) mobile communication technology standard, aims to support various services based on packet data transmission. In such an LTE mobile communication system, a transmission bandwidth may be provided in various ways from 1.25 MHz to 20 MHz.

This system transmission bandwidth supports a maximum transmission rate of 100 Mbps and 50 Mbps in downlink and uplink, respectively, based on a maximum 20 MHz transmission bandwidth. In addition, it provides improved data transmission efficiency, efficient frequency resource usage, mobility, low response time, and optimized technology and quality of service for packet data transmission.

In addition, the mobile communication terminal of the 3G LTE mobile communication system can support a transmission bandwidth of at least 10MHz, and based on the maximum transmission bandwidth of 20MHz bandwidth, the data transmission speed of 30Mbps downlink and 15Mbps uplink at a moving speed of 120Km / h. Support. In addition, high-quality and high-speed multimedia services can be provided, and mobile video services can be provided in earnest.

In the 3G LTE mobile communication system, the base station modulator modulates a data channel, a logical control channel, and a physical control channel into a physical channel under the control of a modulation controller, and then transmits the data channel to a mobile communication terminal through an antenna. In this case, the modulated data channel and the logical control channel may be transmitted through a transport channel (TrCH) encoder in an upper layer of the physical layer, and the physical control channel may be obtained from control information of the modulation controller.

However, the conventional base station modulator implements hardware (a plurality of modulation modules, registers and memories, etc.) in the modulator for each sector in order to modulate the physical channel for each sector. The base station modulator has a risk of malfunction in the base station modulator because the base station modulator has a high possibility of interface collision when the modulation controller, the transport channel encoder, and each hardware interoperate in modulating the physical channel for each sector within a limited time.

In addition, as the number of sectors processed by the base station modulator increases, the utilization of reusable modules, registers, and memory decreases, causing a problem of resource waste in hardware implementation.

An object of the present invention is to provide a base station modulation apparatus and method for performing stable modulation by preventing interface collision between hardware in modulating a physical channel for each sector in a base station modulation apparatus.

Another object of the present invention is to provide a base station modulation apparatus and method that can efficiently use each hardware resource in the base station modulation apparatus.

In order to achieve the above-described problem, a modulation apparatus of a base station including at least one antenna for transmitting a corresponding downlink symbol to each of a plurality of sectors in accordance with an aspect of the present invention, the plurality of sectors obtained sequentially A channel controller for generating a physical channel including any one of a transport channel and physical control channel data corresponding to the control information, and outputting a control command for performing orthogonal frequency division modulation on the physical channel, according to the control command A modulator configured to inversely transform the physical channel to generate at least one downlink symbol for each sector, and a transceiver for sequentially transmitting the at least one downlink symbol for each sector through the at least one antenna corresponding to each other. .

In addition, according to another aspect of the present invention, a modulation method of a base station including at least one antenna for transmitting a corresponding downlink symbol to a plurality of sectors, the method comprising: sequentially obtaining a plurality of sector-specific control information, the control Generating a physical channel including one of a physical control channel and a transmission channel according to the information, sequentially modulating the physical channel, and corresponding to the at least one antenna by using a result of modulating the physical channel Generating a downlink symbol.

According to the exemplary embodiment of the present invention, the modulation apparatus of the base station controls the sector-specific physical channels to be modulated sequentially so that a stable modulation can be performed by preventing an interface collision between a modulation controller, a transmission channel encoder, and each modulation processing module. There is an advantage.

In addition, by increasing the utilization of each hardware in the base station modulation device by doing this, it is possible to reduce the resources when implementing the hardware and thereby reduce the system required power.

DETAILED DESCRIPTION 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.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. In addition, the terms “… unit”, “… unit”, “module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. have.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. At this time, in the embodiment of the present invention, a transmission bandwidth of 10 MHz in a 3G LTE mobile communication system, and shows a base station modulation apparatus for transmitting a downlink signal to three sectors (sector). In addition, the base station according to an embodiment of the present invention has been shown that an antenna system capable of multiple input multiple output (MIMO) is applied.

On the other hand, the present invention is not limited to this, the modulation apparatus of the base station according to an embodiment of the present invention may be applied to different transmission bandwidth and sector number. In addition, the base station modulation apparatus according to an embodiment of the present invention can be applied to mobile communication systems of other fields (kinds) other than the 3G LTE mobile communication system.

1 is a diagram showing the structure of a base station modulation apparatus according to an embodiment of the present invention.

2A is a diagram illustrating a dual bank structure of the modulation control interface unit illustrated in FIG. 1, and FIG. 2B is a diagram illustrating a dual bank structure of the transmission channel interface unit illustrated in FIG. 1.

As shown in FIG. 1, a base station modulation apparatus according to an embodiment of the present invention includes a modulation control unit 110, a modulation control interface unit 120, a transmission channel encoding unit 130, a transmission channel interface unit 140, and a channel control unit. 150, a modulator 160, and a transceiver 170.

The modulation controller 110 controls the sector-specific data channel, the output of the logical control channel and the physical control channel, and transmits control information for the modulation unit 160 to perform a modulation function for each sector to the modulation control interface unit 120. To pass. In this case, the modulation controller 110 sequentially outputs sector-specific control information. The modulation controller 110 may be configured as a digital signal processor (DSP).

In this case, the control information output from the modulation controller 110 includes transmission channel information for generating a physical channel using a data channel and a logical control channel or physical control channel information for generating a physical channel by the control information itself. .

Such a transport channel includes a cell system and a time information channel, a distributed allocation resource block channel, a resource allocation channel, an ACK / NACK signal channel, a variable cell information channel, a paging information channel, and the like. The physical control channel includes a reference signal channel for channel estimation, a synchronization channel for cell group and slot timing synchronization, a synchronization channel for frame synchronization and cell search, an ACK / NACK signal channel for HARQ or ARQ procedure, and An uplink power control channel and the like.

The modulation control interface unit 120 receives the sector-specific control information output from the modulation control unit 110 and temporarily stores each sector for each sector, and sequentially outputs them to the channel control unit 150.

In this case, the modulation control interface unit 120 is assigned to a transmission time interval (TTI) for each sector in order to prevent interface collision with the modulation unit 160 and to secure sufficient processing time for each of the modulation control unit 110 and the modulation unit 160. Accordingly, a plurality of banks are configured to output respective control information.

In detail, the modulation control interface unit 120 outputs sector-specific control information output from the modulation control unit 110 in an address control method according to a memory allocation method. In this case, the modulation control interface 120 may be composed of a plurality of banks, and it is preferable to alternately output control information stored in two banks for resource saving and efficiency of input / output.

For example, the modulation control interface 120 may be configured as DPRAM (Dual-Port RAM) implemented in a dual bank structure for each sector. In detail, as shown in FIG. 2A, the modulation control interface 120 may include two banks for each of three sectors (represented by a, b, and c sectors).

At this time, the control information stored in the first bank of sector a (indicated by 'bank # 0' in FIG. 2A) and the second bank (indicated by 'bank # 1' in FIG. 2A) is alternately controlled by the channel controller 150. ) Is output sequentially.

That is, when the first control information is output from the first bank of sector a, the second control information is then output from the second bank of sector a. In this case, sector-specific control information is sequentially output to the first bank in which the first control information of the sector a is output in such a manner that the third control information of the sector a is stored.

In this manner, the control information stored in each of the dual banks of the remaining sectors (b and c sectors) is also sequentially output to the channel controller 150.

On the other hand, the modulation control interface unit 120 has been shown how to alternately output the control information of the three sectors sequentially into the dual bank for each sector. In addition, the modulation control interface 120 sequentially outputs control information in the order of a sector, b sector, and c sector.

That is, the modulation control interface 120 outputs the first information of the sector b after the first control information of the sector a is output, and outputs the first information of the sector c after the first control information of the sector b is output. can do.

By doing so, the base station modulation apparatus according to the embodiment of the present invention can equalize the order in which the downlink signals for each sector of three sectors are transmitted.

The transport channel encoder 130 sequentially transmits, to the transport channel interface unit 140, a transport channel (TrCH) encoding the sector-specific data channel and the logical control channel transmitted from an upper layer (MAC layer, etc.) of the physical layer. . In this case, the transport channel encoder 130 may be implemented using a field-programmable gate array (FPGA).

The transport channel interface 140 temporarily stores the sector-specific transport channel output from the transport channel encoder 130 and sequentially outputs the transport channel to the channel controller 150.

In this case, the transmission channel interface unit 140 transmits a transmission time for each sector in order to prevent interface collision with the modulation unit 160 and to secure sufficient processing time for each of the transmission channel encoding unit 130 and the modulation unit 160. It consists of a plurality of banks so that data can be output according to the interval.

For example, the transport channel interface unit 140 may be configured as DPRAM (Dual-Port RAM) implemented in a dual bank structure for each sector. In detail, as illustrated in FIG. 2B, the transport channel interface unit 140 may include two banks for each of three sectors (represented by a, b, and c sectors). At this time, the transmission channels stored in the first bank (denoted as 'bank # 0' in FIG. 2B) and the second bank (denoted as 'bank # 1' in FIG. 2B) of sector a are alternately controlled by the channel controller 150. ) Is output sequentially. In this manner, the transmission channels stored in the dual banks of the remaining sectors b and c sectors are also sequentially output to the channel controller 150.

The channel controller 150 acquires the physical control channel for each sector or sequentially transfers the sector-specific transmission channel stored in the transmission channel interface unit 140 by using the sector-specific control information stored in the modulation control interface unit 120. Obtained by. The channel controller 150 controls the modulator 160 to modulate a physical channel for each sector generated by using the obtained physical control channel or transmission channel.

In detail, the channel controller 150 sequentially checks the control information stored in the dual bank for each sector of the modulation control interface 120 to determine whether the channel to be acquired is a physical control channel or a transmission channel for each sector.

In this case, when the control information includes bank information of the transport channel interface unit 140, the channel controller 150 obtains a transport channel stored in the corresponding bank and generates a physical channel. In addition, the channel controller 150 generates a physical channel using the physical control channel when the physical control channel information is included in the control information.

In addition, the channel controller 150 controls the plurality of modulation modules in the modulator 160 to sequentially modulate the generated physical channels through the modulator 160.

The modulator 160 modulates orthogonal frequency division multiplexing (“OFDM”) physical channels transmitted through the channel controller 150 and outputs the modulated signals to the transceiver 170. In this case, the output orthogonal frequency division modulation modulated physical channels may be transmitted to the transceiver 170 according to a predetermined standard through a transmission interface unit (not shown).

At this time, the module configuration and modulation method of the modulator 160 will be described in detail with reference to FIG. 3 below.

The transceiver 170 up-converts and amplifies an input OFDM modulated physical channel through a digital IF process, and converts a downlink signal converted into an RF band through a plurality of antennas to a mobile communication terminal (not shown). ) In this case, each downlink signal transmitted through a plurality of antennas is an OFDM symbol, and is sequentially transmitted through each antenna for each sector.

3 is a diagram illustrating each configuration of the channel controller and the modulator shown in FIG. 1.

As shown in FIG. 3, the channel controller 150 includes a physical channel generation module 151 and a main control module 152.

The modulator 160 includes a scrambling processing module 161, a QAM mapping (Quadrature Amplitude Modulation Mapping) module 162, a gain control module 163, a layer allocation and precoding processing module 164, and an OFDM. A processing module 165.

First, the physical channel generation module 151 of the channel controller 150 obtains control information for sector-specific physical channel generation and modulation control from the modulation control interface 120. The physical channel generation module 151 generates a physical channel by acquiring physical channel data contained in the transmission channel data or control information stored in the transmission channel interface unit 140 according to the obtained control information.

In detail, the physical channel generation module 151 sequentially acquires control information from each sector of the dual bank of the modulation control interface 120, and sequentially obtains a sector-specific transmission channel or a physical control channel according to each control information. do. The physical channel generation module 151 generates a physical channel including data of the sector-specific transmission channel or physical control channel and sequentially transmits the physical channel to the modulator 160.

In this case, the generated physical channel may be a physical control information channel (PCICH), a physical transmit power control channel (PTPCH), a common control physical channel (CCPCH), a physical feedback channel (PFBCH), a downlink reference signal (DL RS), and a physical DCC (PDCCH). Downlink Control Channel (SBS), Secondary Synchronization Signal (SSS), Primary Synchronization Signal (PSS), Physical Downlink Shared Channel (PDSCH), Physical Multicast Channel (PMCH), and the like.

The main control module 152 of the channel controller 150 controls each modulation module of the modulator 160 to sequentially modulate the physical channels generated through the physical channel generation module 151.

That is, the main control module 152 and the scrambling processing module 161, QAM mapping module 162, gain control module 163, layer allocation and precoding processing module 164 of the modulator 160 to be described later and The OFDM processing module 165 transmits a timing control command and identification information of the physical channel so as to sequentially modulate the sector-specific physical channel, respectively.

Specifically, the main control module 152 is a scrambling processing module 161, QAM mapping module 162, gain control module 163, layer allocation and precoding processing module 164 and OFDM processing module 165, respectively. Pass control commands. Such a control command includes input timing information of a physical channel for each sector sequentially input to each modulation module, and sector and type information of the input physical channel.

For example, the physical channel generation module 151 first generates a physical channel using a transport channel obtained from a first bank (bank # 0) of a sector of the transport channel interface unit 140. Then, at the time when the physical channel generation module 151 outputs the generated physical channel to the scrambling processing module 161, the main control module 152 sends the scrambling processing module 161 to the physical channel input timing information, sector and type. Communicate information

In this way, the main control module 152 controls the sequential modulation of the physical channel for each sector by transmitting the input timing information, sector and type information of the physical channel currently input to each module of the modulator 160.

In this way, the base station modulation apparatus according to the embodiment of the present invention may implement each processing module as one instead of implementing a plurality of processing modules of the modulation unit 160 for each sector.

Next, the scrambling processing module 161 of the modulator 160 performs scrambling processing on the physical channel for each sector according to the type of cell-specific scrambling method and the user equipment-specific scrambling method according to the control of the main control module 152. do.

The QAM mapping module 162 performs QAM mapping on the physical channel output from the scrambling processing module 161 under the control of the main control module 152. At this time, the physical channel is QAM mapped and digitally modulated according to the type and sector.

The gain control module 163 controls the channel power by multiplying the digital gain by the type and sector of the physical channel output from the QAM mapping module 162 according to the control of the main control module 152.

The layer allocation and precoding processing module 164 allocates a physical channel output from the gain control module 163 to at least one layer for each type and sector according to the control of the main control module 152 and then precodes the layer. (Pre-Coding)

At this time, the layer allocation and precoding processing module 164 may assign the complex symbol-modulated physical channel to a single-input single-output (SISO), space-frequency block code (SFBC), beam-forming (BF), and spatial multiplexing (SM). Layer allocation is performed by performing the same function and the pre-coding of the layer allocated physical channel is performed through a cyclic delay diversity (CDD) method.

3 shows that the sector-specific physical channel is allocated to four layers through the layer assignment and precoding processing module 164. As described above, the physical channels allocated to the four layers are transmitted as OFDM symbols for each sector through four antennas. In this case, each path of the four antennas is shown as 'Tx0' to 'Tx3' in FIG. 3.

The OFDM processing module 165 transmits the layer allocation and the precoded physical channel to the transceiver 170 by performing an Orthogonal Frequency Division Multiplexing (OFMD) modulation process. 3 shows that the OFDM processing module 165 is configured for each sector, and the OFDM processing module 165 for each sector is indicated by the same reference numeral.

Specifically, the OFDM processing module 165 sequentially stores the physical channel points, which are the result of the layer allocation of the input physical channels, for each sector, and then stores a predetermined amount of sector-specific physical channel points to become an OFDM symbol. Inverse Fast Fourier Tramsform (hereinafter referred to as IFFT) is performed to output through the transceiver 170. At this time, the OFDM processing module 165 stores the layer allocation and precoded physical channel points for each sector according to the control of the main control module 152.

4 is a diagram illustrating a configuration of an OFDM processing module according to an embodiment of the present invention.

As shown in FIG. 4, the OFDM processing module 165 includes an input storage 651, an IFFT processor 652, an output storage 653, and a cyclic prefix (CP) processor. 654).

The input storage unit 651 transfers the sector-specific physical channel point output from the layer allocation and precoding processing module 164 to the input of the IFFT processor 652 after storing as much as the capacity transmitted in the OFDM symbol.

Specifically, FIG. 4 illustrates that the input storage 651 is configured with four multiplexing memories for each sector. Four sector-by-sector multiplexing memories of the input storage 651 store four physical channel points per sector output from the layer allocation and precoding processing module 164, respectively. Hereinafter, the multiplexed memory for each sector of the input storage unit 651 will be represented as first to fourth memories, respectively.

In this sector-specific multiplexed memory, layer allocation and precoded physical channel points are stored in a sector-specific multiplexed memory location. In this case, the input storage unit 651 temporarily stores a plurality of sectors of the physical channel points sequentially in accordance with the control command of the main control module 152, and then stores the IFFT processor 652 at a time when a certain amount of OFDM symbols is stored. Output sequentially.

For example, the input storage unit 651 outputs a according to the control of the main control module 152 when one physical channel of the layer allocation and the precoded sector is output to four transmission antenna paths as physical channel points. Four physical channel points are stored in the first through fourth memories 11, 12, 13, and 14 of the sector, respectively.

In addition, the input storage unit 651 transfers the four physical channel points of the next sector b to the b sector first through fourth memories 15, 16, 17, and 18 according to a control command of the main control module 152. Save separately. In this manner, the sector-specific physical channel points are stored in the multiplexed memory of each sector as much as capacity to be transmitted in OFDM symbols (in the embodiment of the present invention, 1024 for each sector of multiplexed memory).

The IFFT processor 652 performs Inverse Fast Fourier Transform (IFFT) processing on a plurality of sector-specific physical channel points to modulate the time domain signal in the frequency domain. The IFFT processor 652 stores the physical channel points modulated by the time domain signal in the output storage 653 for each sector.

For example, as shown in FIG. 4, the IFFT processor 652 is represented by one 1024 point IFFT processor in each sector.

In detail, the a-sector IFFT processor 311 receives 1024 physical channel points sequentially output from the a-sector first memory 11 to the fourth memory 14 of the input storage unit 651 and performs IFFT processing. And then output to output storage 653.

Then, the b sector IFFT processor 312 receives each of the 1024 physical channel points sequentially output from the b sector first memory 15 to the fourth memory 18 of the input storage unit 651 to perform IFFT processing. And then output to output storage 653.

Then, the c sector IFFT processor 313 receives each of the 1024 physical channel points sequentially output from the c sector first memory 19 to the fourth memory 22 of the input storage unit 651 to perform IFFT processing. After that, it outputs to the output storage 653. In this manner, the physical channel points of the a sector first through fourth memories 11, 12, 13, and 14 of the input storage unit 651 are output to process IFFT. B sector physical channel points are divided into four memories and input into the input storage unit 651. Then, while the physical channel points of the b sector first to fourth memories 15, 16, 17, and 18 of the input storage unit 651 are output, the c sector physical channel points of the sector 4 are input to the input storage unit 651. The inputs are divided into two memories 19, 20, 21, and 22. That is, the sector-specific physical channel points sequentially input to the sector-specific memory of the input storage unit 651 are sequentially IFFT processed by the IFFT processor 652.

Hereinafter, the physical channel points sequentially IFFT processed through the sector-by-sector IFFT processor are expressed as first to fourth physical channel point signals for each sector.

The output storage 653 transfers the IFFT processed sectoral first through fourth physical channel point signals to the input of the CP processor 654. 4 shows that the output storage 653 is composed of four multiplexed memories for each sector.

For example, the first through fourth physical channel point signals of a sector that are IFFT processed sequentially through the a sector IFFT processor 311 may include the first through fourth sectors 51 and 52 of the a sector of the output storage 653. , 53 and 54 sequentially. The output storage 653 then outputs the stored first to fourth physical channel point signals of the sector a to the CP processor 654 simultaneously.

In this manner, output storage 653 outputs the first through fourth physical channel point signals of the remaining sectors to CP processor 654 simultaneously.

The CP processor 654 acquires the sector-specific first through fourth physical channel point signals of the output storage 653 and adds a CP to the IFFT processing result signal. The CP processor 654 transmits the sector-specific OFDM symbols to which the CP is added to the transceiver 170.

In this case, as shown in FIG. 4, the CP processor 654 is configured with four CP processors for each sector to simultaneously add CPs to four IFFT result signals for each sector. In FIG. 4, four CP processors for each sector are shown as first to fourth CP processors. In addition, the first to fourth CP processors are indicated by one reference numeral.

In this way, four physical channel point signals for each sector can be simultaneously transmitted through four antennas as OFDM symbols.

5 is a flowchart illustrating a sequential modulation control method of a channel controller according to an exemplary embodiment of the present invention.

First, the channel controller 150 sequentially obtains control information from the sector-specific dual banks of the modulation control interface 120 (S700). That is, the channel controller 150 alternately obtains control information stored in each sector of the dual bank of the modulation control interface 120. Such sector-specific control information includes sector and type information of a transport channel or information on a physical control channel stored in the transport channel interface 140.

Then, the channel controller 150 checks the obtained control information to determine whether the channel to be modulated is a physical control channel or a transmission channel (S710).

In this case, when the acquired control information is physical control channel information, the channel controller 150 generates a physical channel using the physical control channel information included in the control information and outputs the physical channel to the modulator 160 (S721). In this case, the control information includes sector and type information of the physical control channel.

On the other hand, if the acquired control information is control information for the transmission channel, the channel controller 150 checks bank information of the transport channel interface unit 140 in which the transmission channel to be obtained is stored (S722).

Then, the channel controller 150 obtains a transport channel from the bank of the identified transport channel interface unit 140, generates a physical channel, and outputs the physical channel to the modulator 160 (S723). At this time, the transmission channel to be obtained is stored in the dual bank for each sector of the transmission channel interface unit 140. When the transmission channel is output from one of the dual banks, the next transmission channel information is stored in the bank again.

That is, the transport channel interface unit 140 outputs transport channel data in any one of the sector-specific dual banks, and obtains and stores another transport channel from the transport channel encoder 130. As described above, while the other transport channel is stored in any one of the dual banks for each sector of the transport channel interface unit 140, the transport channel previously stored in the other one is output to the channel controller 150.

Then, the channel controller 150 controls each modulation module of the modulator 160 to generate a sector-specific physical channel as an OFDM symbol (S730). In this case, the generated OFDM symbol may be generated equal to the number of antennas included in the base station. That is, the physical channels for each sector are layer-allocated in the same manner as the number of antenna paths and are generated as OFDM symbols.

Here, each modulation module of the modulator 160 includes a scrambling processing module 161, a QAM mapping module 162, a gain control module 163, a layer allocation and precoding processing module 164, and an OFDM processing module 165. ). In this case, the channel controller 150 transmits a control command for each sector and type of a physical channel currently input to each processing module of the modulator 160.

Since the modulation processing method of each modulation module of the modulator 160 has been described above with reference to FIG. 3, a detailed description thereof will be omitted.

Next, the sector-by-sector IFFT processing method of the OFDM processing module 165 according to the embodiment of the present invention will be described with reference to FIG. 6.

6 is a flowchart illustrating a sequential IFFT processing method according to an embodiment of the present invention.

First, the OFDM processing module 165 stores the sector-specific physical channel points sequentially input from the previous stage (layer allocation and precoding processing module) in each multiplexed memory of the input storage unit 651 (S800).

In detail, the sector-specific physical channels input to the input storage unit 651 are divided into a plurality of physical channel points as many as the number of layer allocations, and are respectively stored at designated positions of the plurality of multiplexed memories for each sector. In this case, the plurality of physical channel points are respectively stored in a plurality of sector-specific multiplexed memories according to control commands of the main control module 152.

Then, the input storage unit 651 sequentially transfers the physical channel points stored in the sector-by-sector multiplexed memory to the IFFT processor 652 in sequence (S810). In this case, the IFFT processor 652 is configured for each sector to enable stable IFFT processing.

Then, the IFFT processor 652 IFFT-processes the input physical channel point, modulates it into a physical channel point signal in the time domain, and outputs it to the output storage 653 (S820).

Then, the output storage device 653 sequentially stores the IFFT-processed physical channel point signal for each sector (S830), and then simultaneously the CP processor 654 at the time when all the physical channel point signals are stored for each sector as many as the number of assigned layers. And outputs it to (S840).

In this case, the output storage 653 may be configured with multiplexed memories equal to the number of layer allocations for each sector, and the number of layer allocations is equal to the number of antenna paths to which an OFDM symbol is to be transmitted.

Thereafter, the CP processor 654 adds CPs to the input physical channel point signals, respectively, and outputs an OFDM symbol to be transmitted to the transceiver 170 (S850).

In this case, the CP processor 654 may be configured to have the same number of layer allocations for each sector.

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.

1 is a diagram showing the structure of a base station modulation apparatus according to an embodiment of the present invention.

FIG. 2A is a diagram illustrating a dual bank structure of the modulation control interface unit illustrated in FIG. 1.

FIG. 2B is a diagram illustrating a dual bank structure of the transport channel interface unit illustrated in FIG. 1.

3 is a diagram illustrating each configuration of the channel controller and the modulator shown in FIG. 1.

4 is a diagram illustrating a configuration of an OFDM processing module according to an embodiment of the present invention.

5 is a flowchart illustrating a sequential modulation control method of a channel controller according to an exemplary embodiment of the present invention.

6 is a flowchart illustrating a sequential IFFT processing method according to an embodiment of the present invention.

Claims (12)

A modulation apparatus of a base station including at least one antenna for transmitting a corresponding downlink symbol to a plurality of sectors, respectively, Generating a physical channel including any one of a transmission channel and physical control channel data corresponding to a plurality of sector-specific control information obtained sequentially, and outputting a control command for sequentially performing orthogonal frequency division modulation on the physical channel; Channel control unit; A modulator for inversely transforming the physical channel according to the control command to generate at least one downlink symbol for each sector; And And a transceiver configured to sequentially transmit the at least one downlink symbol for each sector through the corresponding at least one antenna. Modulation device. The method of claim 1, A transport channel encoder for generating the transport channel by encoding any one of a sector-specific data channel and a sector-specific logical control channel; A transport channel interface unit for sequentially acquiring and storing the transport channel for each sector and then outputting the transport channel according to the order in which the transport channel is stored; A modulation controller for sequentially outputting a plurality of sector-specific control information; And Modulation control interface unit for sequentially obtaining and storing the plurality of control information for each sector, and outputs according to the stored order Modulation device further comprising. The method of claim 2, The transport channel interface unit, A sector-specific channel storage area each composed of a plurality of banks, Receiving the transmission channel for each sector from the transmission channel encoder and sequentially storing the respective sectors in each bank of the sector-specific channel storage region, Sequentially outputting the stored transmission channels at the request of the channel controller Modulation device. The method of claim 3, The modulation control interface unit, A sector-specific control information storage area each composed of a plurality of banks, Receiving the sector-specific control information from the modulation controller and sequentially storing the sector-specific control information storage regions in each bank, Sequentially outputting the sector-specific control information at the request of the channel controller Modulation device. The method according to claim 3 or 4, The modulator, A scrambling processing module for scrambling the physical channel for each sector according to a type; A mapping module for digitally modulating the scrambled physical channel; A gain control module for digitally adjusting the digitally modulated physical channel according to type and sector information; A layer allocation and precoding processing module for allocating and gaining the gain-adjusted physical channel to a plurality of layers according to type and sector information to generate a plurality of physical channel points; And Orthogonal frequency division processing module for inverse Fourier transform processing of the plurality of physical channel points to generate orthogonal frequency division symbols for each sector Modulation device comprising a. The method of claim 5, The channel control unit, A physical channel generator configured to generate a physical channel using the physical control channel according to the control information or to obtain a transport channel from the transport channel interface unit to generate a physical channel and sequentially output the physical channel; And The main control module for outputting a control command including the type and sector information of the physical channel to each module when the physical channel is input to each module of the modulator. Modulation device comprising a. The method of claim 6, The orthogonal frequency division processing module, An input storage unit for sequentially storing the plurality of physical channel points in a plurality of input storage areas for each sector; An inverse Fourier transform processor for generating a plurality of physical channel point signals for each sector by converting them into signals in a time domain according to an order in which physical channel points corresponding to orthogonal frequency division symbol capacities are stored in the plurality of input storage regions for each sector; An output storage device for storing the plurality of physical channel point signals for each sector in a plurality of output storage areas for each sector, and simultaneously outputting all of the physical channel point signals in a plurality of output storage areas for one sector. ; And A cyclic prefix adder for outputting an orthogonal frequency division symbol by adding cyclic prefixes to physical channel point signals simultaneously output from the plurality of sector-specific output storage areas. Modulation device comprising a. A modulation method of a base station including at least one antenna for transmitting a corresponding downlink symbol to each of a plurality of sectors, Sequentially obtaining a plurality of control information for each sector; Generating a physical channel including any one of a physical control channel and a transport channel according to the control information; Sequentially modulating the physical channels; And Generating a downlink symbol corresponding to each of the at least one antenna by using the result of modulating the physical channel Modulation method comprising a. The method of claim 8, Generating the physical channel, Sequentially checking a plurality of control information for each sector; If the channel information included in the control information is a physical control channel, generating the physical control channel as a physical channel; And If the channel information included in the control information is transport channel information, sequentially obtaining the transport channel for each sector and generating a physical channel; Modulation method comprising a. The method of claim 9, Modulating the physical channel sequentially, Scrambling the physical channel according to a type; Digitally modulating the scrambled physical channel; Digital gain control of the digitally modulated physical channel according to type and sector information; Allocating and gaining the gain-adjusted physical channel to at least one layer according to type and sector information to generate a plurality of physical channel points; And Inverse Fourier transform processing of the plurality of physical channel points to generate orthogonal frequency division symbols for each sector Modulation method comprising a. The method of claim 10, Generating the plurality of physical channel points as the orthogonal frequency division symbols for each sector, Sequentially storing the plurality of physical channel points for each sector; Generating a plurality of physical channel point signals for each sector by performing inverse Fourier transformation when the stored plurality of physical channel points is equal to the orthogonal frequency division symbol capacity; Sequentially storing the plurality of physical channel point signals for each sector for each sector; And If all of the plurality of physical channel point signals of the first sector are stored among the plurality of physical channel point signals for each sector, a cyclic prefix is added to each of the plurality of physical channel point signals of the first sector simultaneously. Generating Orthogonal Frequency Division Symbol Modulation method comprising a. The method of claim 11, The transport channel is generated by encoding any one of a sector-specific data channel and a sector-specific logical control channel. Modulation method.

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