KR20080086125A - Method and apparatus for transmitting/receiving data in wireless communication system - Google Patents

Method and apparatus for transmitting/receiving data in wireless communication system Download PDF

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Publication number
KR20080086125A
KR20080086125A KR1020070027858A KR20070027858A KR20080086125A KR 20080086125 A KR20080086125 A KR 20080086125A KR 1020070027858 A KR1020070027858 A KR 1020070027858A KR 20070027858 A KR20070027858 A KR 20070027858A KR 20080086125 A KR20080086125 A KR 20080086125A
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KR
South Korea
Prior art keywords
common pilot
data
variable common
number
transmission
Prior art date
Application number
KR1020070027858A
Other languages
Korean (ko)
Inventor
김병식
노상민
이주호
장유지엔
조준영
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삼성전자주식회사
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Priority to KR1020070027858A priority Critical patent/KR20080086125A/en
Publication of KR20080086125A publication Critical patent/KR20080086125A/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/76Pilot transmitters or receivers for control of transmission or for equalising
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0602Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
    • H04B7/0608Antenna selection according to transmission parameters
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2626Arrangements specific to the transmitter
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2647Arrangements specific to the receiver

Abstract

A method and an apparatus for transmitting/receiving data in a wireless communication system using multiple antennas are provided to increase the transmission efficiency of a data signal by utilizing resources for data transmission when a variable common pilot is not transmitted. A multi-antenna number selector(703) determines the number of transmission antennas according to a transmission mode of predetermined data. A resource allocator(707) sets a position of a variable common pilot as a data region according to the number of the transmission antennas, and if the number of transmission antennas is smaller than a certain number, the resource allocator maps data to the position of the variable common pilot. If the number of the transmission antennas is smaller than the certain number, a data generator(701) generates data in consideration of the variable common pilot. A transmitter transmits the position information of the variable common pilot and the data to a terminal.

Description

TECHNICAL AND APPARATUS FOR TRANSMITTING / RECEIVING DATA IN WIRELESS COMMUNICATION SYSTEM}

1 illustrates a downlink frame structure of EUTRA

2 illustrates a common pilot transmission structure of a base station having two antennas

3 illustrates an example of a mapping structure of a control channel used for EUTRA.

4 is a diagram illustrating a transmission structure of a common pilot according to a first embodiment of the present invention.

5 illustrates an example of allocating a variable common pilot to an area of a control channel in a mobile communication system using multiple antennas.

6 is a diagram illustrating a structure when no transmission of a variable common pilot according to the first embodiment of the present invention;

7 is a diagram illustrating a base station according to the first embodiment of the present invention.

8 is a diagram illustrating a terminal according to a first embodiment of the present invention;

9 is a diagram illustrating in detail a data generator of a base station according to the first embodiment of the present invention.

10 is a flowchart illustrating a variable common pilot transmission procedure of a base station according to the first embodiment of the present invention.

11 is a flowchart illustrating a receiving process of a terminal according to the first embodiment of the present invention.

12 is a diagram showing a transmission structure of a common pilot according to a second embodiment of the present invention.

The present invention relates to a method of transmitting and receiving data in a wireless communication system, and more particularly, to a method of allocating a reference signal (RS or pilot; hereinafter referred to as a pilot) during downlink transmission in a mobile communication system using multiple antennas.

Recently, in the mobile communication system, a multi-antenna scheme is applied to an orthogonal frequency division multiple access (OFDMA) scheme as a useful method for high-speed data transmission in a wireless channel. As a representative example, and the next generation mobile communication technology standard (Enhanced Universal Terrestrial Radio Access) EUTRA current asynchronous cellular mobile communication standardization organization 3GPP (3 rd Generation Partnership Project) also indicated the multi-antenna technique applied to the OFDMA-based downlink .

In general, the transmission structure of the EUTRA will be described by way of example.

1 illustrates a downlink frame structure of EUTRA. As shown, one frame 100 is composed of ten subframes 101 in the EUTRA downlink. The 1 ms subframe, which is the basic unit of the transmission structure, consists of two 0.5 ms slots 102. Each slot is composed of seven Long Blocks (LB) 103, and one LB corresponds to one OFDM symbol. One LB subcarrier resource is defined as a time-frequency resource element (hereinafter referred to as a resource element) 104.

The downlink structure of EUTRA is divided into a control channel region 105 and a data channel region 106. Herein, the control channel region means a series of communication resources including modulation and coding information of a transmission data signal, downlink scheduling information, uplink scheduling grant information, and reception ACK / NACK for an uplink signal. It is allocated to three OFDM symbol intervals. The data channel region means a series of communication resources including data such as voice and packet transmitted to each terminal, and is allocated to the remaining resources except for the control channel in the subframe.

In the EUTRA standard, downlink has been determined to support multiple input / output (MIMO) mode using multiple antennas.

FIG. 2 is a diagram illustrating a common pilot transmission structure of a base station having two antennas, and illustrates a common pilot R1 200 of antenna 1 and a common pilot R2 201 of antenna 2, respectively. The common pilot is allocated to the control channel region 202 and the data channel resource region 203 for each antenna. In order to prevent signal interference between antennas, signals are not transmitted to resources allocated to other antenna common pilots. (No Transmission) Resource 204 exists.

In general, a common pilot is a predefined signal between a base station and a terminal and is allocated to a fixed downlink resource in a cell. The common pilot allocation resource is known to all terminals in the cell, and each terminal estimates a channel from the corresponding pilot position when receiving a signal from the base station and uses the estimated value to recover received data. An OFDMA-based base station with multiple antennas allocates common pilot resources for each antenna for channel estimation from each transmit antenna to the receiving terminal.

When the fixed common pilot is transmitted to the antennas 1 and 2, it can be classified as follows. Antenna 1 basically requires a common pilot for single antenna transmission. Antenna 2 may also be used when applying a transmit diversity scheme for improving cell coverage and detection reliability of a fixed transmission channel including common information in a cell, and thus requires a fixed common pilot. In the case of using a larger number of antennas, a spatial multiplexed MIMO technique for high-speed data transmission may be used.

When the base station uses the MIMO scheme using four transmission antennas, antennas 3 and 4 are additionally used in addition to antennas 1 and 2 of FIG. 2, and additionally, the variable common pilot signal transmission of the antennas 3 and 4 is required. If the fixed common pilot 3 and the variable common pilot 4 are fixedly supported to support the transmission, power resources and subcarrier resource consumption are increased due to increased common pilot transmission in the downlink structure, so that four transmit antenna MIMO schemes are not used. In this case, overhead may be reduced by limiting transmission of common pilot 3 and common pilot 4 in subframe or frame units.

As mentioned above, resources to which a common pilot can be variably allocated are classified into a control channel region and a data channel region. The control channel region of EUTRA is composed of control channel elements using Quadrature Phase Shift Keying (QPSK) modulation. The control channel element is mapped to a specific set of resource elements according to a rule promised between the base station and the terminal. One control channel carries downlink or uplink scheduling information for one MAC ID, and the ID is implicitly encoded in a cyclic redundancy check (CRC).

Each receiving terminal detects control information by monitoring a control channel candidate group that may include control channel information related to itself. Candidate control channels to be monitored by the UE are formed through higher layer signals. The time-frequency position of the control channel element is implicitly provided from the number of control channel elements transmitted from the base station every certain number of subframes. Each scheduled terminal knows the start position of the data transmitter in the subframe.

3 is a diagram illustrating an example of a mapping structure of a control channel used in general EUTRA. In the example, six control channel elements 300 constitute one control channel 301 and are allocated within the first three OFDMA symbol periods of a subframe, that is, the control channel region. The terminal monitors the control channel candidate group 303 composed of 11 control channel candidates 302 implicitly informed from the base station, and attempts blind decoding for detecting control information. The mapping of the control channel element to the resource element is performed according to a predefined rule between the base station and the terminal using the remaining resources except for the subcarrier symbol to which the common pilot is allocated in FIG. 2.

As described above, when a common pilot position is allocated to a control channel in a system using multiple antennas, when control information is not used, control information cannot be mapped to the common pilot position, thereby limiting a transmission rate. .

Accordingly, an object of the present invention is to provide a method and an apparatus for transmitting and receiving data efficiently using a common pilot signal in a mobile communication system using multiple antennas.

Another object of the present invention is to provide a common pilot transmission / reception method and a transceiver according to the same, which can reduce power and signal transmission resource consumption by using a common pilot signal in a mobile communication system using multiple antennas.

According to an aspect of the present invention, there is provided a data transmission method in a transmitter of a wireless communication system using at least two multiple antennas, the method comprising: determining a number of transmission antennas according to a transmission mode of a predetermined data; Setting the location of the variable common pilot to the data area according to the number of antennas; if data is less than or equal to a predetermined number, mapping data to the location of the variable common pilot; and position of the variable common pilot And transmitting the information and the data to the terminal.

The present invention for achieving the above-mentioned is a multi-antenna number selector for determining the number of transmit antennas according to a transmission mode of a predetermined data in a transmitter of a wireless communication system using at least two multiple antennas, the number of transmit antennas If the position of the variable common pilot is set to the data area according to the number of the transmission antennas, the resource allocator for mapping data to the position of the variable common pilot, and if the number of the transmission antennas, And a data generator for generating data in consideration of the variable common pilot, and a transmitter for transmitting the position information and the data of the variable common pilot to the terminal.

According to an aspect of the present invention, there is provided a data receiving method in a receiver of a wireless communication system using at least two multiple antennas, the method comprising receiving transmission structure information and data including whether a variable common pilot is used and location information. And if the variable common pilot is used based on the transmission structure information, determining and decoding a signal included in the position of the variable common pilot as the variable common pilot.

According to an aspect of the present invention, there is provided an apparatus for receiving data in a receiver of a mobile communication system using at least two multiple antennas, the apparatus for receiving transmission structure information and data including whether to use a variable common pilot and location information. A reception unit, a common pilot extractor for extracting information on whether a variable common pilot is used and position based on the transmission structure information, and a signal included in the position of the variable common pilot when the variable common pilot is not used as data; And a decoding unit for determining and performing decoding.

DETAILED DESCRIPTION Hereinafter, detailed descriptions of preferred embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that the same components in the figures represent the same numerals wherever possible. Specific details are set forth in the following description, which is provided to aid a more general understanding of the invention. In the following description of the present invention, if 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 provides a method for efficiently using downlink transmission resources by utilizing a variable common pilot for other channel resources in a wireless communication system using multiple antennas. The present invention provides an efficient downlink transmission structure of a variable common pilot to achieve transmission of a control channel region and a data channel region. In the data channel region, since there is no fixed protocol like the control channel region, variable common pilot or flexible allocation of data is possible.

The base station is signaled to the terminal information on the presence or absence of the variable common pilot transmission, the terminal determines whether the variable common pilot is actually transmitted based on this. The base station allocates the variable common pilot only to the data channel region, not the control channel region, and transmits data to the corresponding resource when the variable common pilot is not transmitted. Since the terminal already knows that there is no variable common pilot transmission by receiving transmission structure information from the base station, the terminal may detect data included in the variable common pilot resource. Hereinafter, preferred embodiments of the present invention will be described.

It is noted that the invention is not limited to the EUTRA systems and examples described below, but is applicable to all systems using OFDMA and multiple antenna techniques. Here, the antenna is a concept including both a physical antenna and a virtual antenna. In addition, the multi-antenna technique in the present invention is a spatial multiplexing technique that improves the transmission rate by spatially parallel transmission of other signals using multiple transmit / receive antennas, and a diversity gain by transmitting and receiving the same signal through multiple antennas. It reveals that the concept encompasses both spatial diversity techniques. However, the present invention is not limited to the specific system mentioned in the above description and can be applied as an improvement scheme for a situation in which transmission efficiency is limited by variable pilot transmission resources.

Next, the common pilot transmission structure according to the first embodiment of the present invention will be described with reference to FIG.

4 is a diagram illustrating a transmission structure of a common pilot according to a first embodiment of the present invention, in which antennas 1 and 2 are fixedly used and antennas 3 and 4 use four transmission antennas among four transmission antennas. (Hereinafter, referred to as 4 TX MIMO) shows a common pilot transmission structure application example of the present invention in the case of transmitting a signal only in use.

Referring to FIG. 4, the variable common pilots R3 402 and R4 403 of the antennas 3 and 4 are not transmitted to the control channel region. R3 402 and R4 403 are transmitted only in the data channel region 401. From the point of view of the receiving terminal, the only common pilots present in the control channel region 401 are R1 404 and R2 405, which are fixed common pilots of antennas 1 and 2, which are always included in the control channel region configuration rule and assigned and There is no further restriction on the transmission efficiency of the control channel region being transmitted.

Next, an example of allocating a variable common pilot to an area of a control channel in a mobile communication system using multiple antennas will be described with reference to FIG. 5.

5 illustrates a case where two fixed common pilots and two variable common pilots are transmitted. Herein, it is assumed that a variable common pilot of antennas 3 and 4 is located in the third LB of each slot, and subcarriers in the LB are allocated to the same subcarriers as the fixed common pilots R1 500 and R2 501 of the antennas 1 and 2. Referring to FIG. 5, signal transmission of another antenna is limited to resources allocated to one antenna common pilot to prevent inter-antenna interference. The signal untransmitted resource element due to the common pilot is divided into an untransmitted resource element 502 by the fixed common pilot and an untransmitted resource element 503 by the variable common pilot.

In general, the resource allocation of the control channel region is performed according to the rules promised between the base station and the terminal as described above, and the resource elements to which the control channel elements can be mapped are resources excluding common pilot resources. Accordingly, since the variable common pilot resource allocated to the control channel region cannot flexibly transmit information according to whether the variable common pilot is transmitted, the corresponding common resource is wasted when the variable common pilot is not transmitted compared to the present invention of FIG. 4.

6 is a diagram illustrating a transmission structure of a common pilot according to a first embodiment of the present invention, in which data is transmitted to a corresponding resource without transmitting the variable common pilot of antennas 3 and 4 when the 4 TX MIMO scheme is not used. An application example of the present invention is shown.

Referring to FIG. 6, R1 600 and R2 601 are fixedly transmitted to the control channel region 602, and the variable common pilot resource of the data channel region 603 is used for data transmission. Accordingly, as compared with FIG. 5, the data channel region can transmit variable common pilot replacement data 604, thereby increasing data transmission efficiency. In addition, the present invention does not require the modification of the control channel region allocation rule and a significant complexity increase for the receiving terminal, and there is no resource loss due to the control channel region allocation of the variable common pilot. The advantage is the efficient use of resources.

7 is a diagram illustrating a base station according to the first embodiment of the present invention. Dotted lines in the figure represent control signals and solid lines represent the flow of actual data.

Referring to FIG. 7, each signal generated from the control information generator 700 and the data generator 701 is separated into each transmit antenna transport stream through the serial / parallel converter 702. The data generator 701 generates a signal based on the multiple antenna number selection block 703, details of which will be described separately below. In the present embodiment, modulation and channel coding are applied to each antenna transport stream in common, but the present invention can also be used in a scheme in which modulation and channel coding for each antenna are applied. The serial / parallel converter 702 also performs parallelization by the number of antenna transport streams based on the determination of the multiple antenna number selection block 703.

The parallelized signal is allocated to the control channel region and the data channel region through the resource allocator 707. The fixed common pilot generator 704 generates a common pilot fixedly transmitted to the antennas 1 and 2, and the variable common pilot generator 706 generates the variable common pilot of the antennas 3 and 4 by the determination of the variable common pilot controller 705. Turn on / off. The generated fixed and variable common pilot signals are mapped to corresponding resources in the resource allocator 707. Common pilot transmission related information of the multi-antenna number selection block 703 is transmitted to terminals in a cell using a cell information common transmission channel such as a broadcast channel (BCH) or other L1 control channel. After resource allocation is completed, signals are transmitted through the Inverse Fast Fourier Transform (IFFT) block 708 for each transmit antenna through the parallel / serial converter 709, the Cyclic Prefix (CP) inserter 710, and the multiple transmit antenna 711. do.

8 is a diagram illustrating a terminal according to a first embodiment of the present invention. Referring to FIG. 8, a signal received for each of the multiple reception antennas 800 passes through a Fast Fourier Transform (FFT) block 803 through a CP remover 801 and a serial / parallel converter 802. Receiving terminal, which determines whether the variable common pilot is transmitted from the base station through the cell information common transmission channel such as the above-described BCH or other L1 control channel, etc., is located through the common pilot extractor 804 from the FFT block output signal of each receiving antenna. The common pilot of is extracted and the channel estimation value is obtained through the channel estimator 805 based on this. The obtained multiplex antenna transmit / receive channel estimates are used in a spatial demultiplexing and signal demodulation block 806 that separates each transmit antenna signal from the received signal. The control information is first extracted and then the data signal is restored.

9 is a diagram illustrating in detail a data generator 701 of a base station, and illustrates a process of generating a transmission data signal based on a determination of a multi-antenna mode selection block.

Referring to FIG. 9, if it is determined whether to transmit variable common pilots 3 and 4 by the multi-antenna mode selection block 703, the signal generated by the data bit generator 902 may include the variable common pilot 3 and 4 resources in the data transmission. The data symbol is generated through the channel encoder 903, the interleaver 904, and the modulator 905 in consideration of the case and the amount of code blocks corresponding to the case where the variable common pilot is transmitted. This is because the amount of data symbols varies depending on whether data of a variable common pilot resource is transmitted. Since the terminal knows the occurrence pattern of the data generator by using the above-described notification method from the base station, it can restore the data.

10 is a flowchart illustrating a variable common pilot transmission procedure of a base station according to the first embodiment of the present invention. Referring to FIG. 10, in step 1000, a base station having multiple antennas may select one of a transmit diversity or a MIMO mode using two antennas and a MIMO mode using four antennas. In the transmission diversity or MIMO mode using two antennas, the control is performed to generate a variable common pilot in step 1001. Thereafter, the base station allocates a variable common pilot for each antenna to a variable common pilot resource among transmission resources in step 1002. On the other hand, if the transmission mode is a MIMO mode using four antennas, the control proceeds to step 1003 to prevent the variable common pilot from being generated. Thereafter, the base station instead maps data to variable common pilot resources for each antenna in step 1004. Finally, in step 1005, the base station allocates and transmits the remaining fixed common pilot, control, and data channels.

11 is a flowchart illustrating a receiving process of a terminal according to the first embodiment of the present invention. Referring to FIG. 11, in step 1100, the UE recognizes variable common pilot transmission related information received from a base station through a cell information common transport channel such as a BCH or other L1 control channel. Then, in step 1101, the terminal checks whether the variable common pilot is transmitted or not based on the information. When the variable common pilot is transmitted, the terminal performs channel estimation using the signal of the variable common pilot resource and the fixed common pilot in step 1102. Thereafter, in step 1103, the terminal decodes the signal of the data channel region excluding the variable and fixed common pilot resources.

 If there is no variable common pilot transmission, the UE performs channel estimation using only the fixed common pilot in step 1104. Thereafter, in step 1105, the signal of the variable common pilot resource excluding the fixed common pilot resource and the signal of the data channel region are decoded.

Next, a second embodiment of the present invention will be described. 12 is a diagram illustrating a transmission structure of a common pilot according to a second embodiment of the present invention, in which a control channel region signal is transmitted using only two antennas and a data channel region signal is allowed to be transmitted using four antennas. Indicated.

Referring to FIG. 12, since the control channel region 1200 is transmitted only to the antennas 1 and 2, channel estimation regarding control information is also performed using only R1 1204 and R2 1205. On the other hand, since the data channel region 1201 is transmitted using all four antennas, channel estimation should be performed using R3 1202 and R4 1203 in addition to R1 1204 and R2 1205. In this example, R3 (1202) and R4 (1203) are unnecessary for the control channel region channel estimation, and R3 (1202) and R4 (1203) are needed for channel estimation when data is restored. By arranging further inward (1201), a structure is proposed to improve the accuracy of data channel region channel estimation. Since the base station and the terminal transmission and reception structure and operation procedure of the present embodiment are the same as described above in the first embodiment, they will be omitted.

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, when the downlink multi-antenna transmission scheme is used in a wireless communication system using multiple antennas, the present invention limits variable common pilot allocation resources to data channel region resources in an environment in which a variable common pilot exists. Accordingly, the present invention can transmit the control channel region fixedly regardless of whether the variable common pilot is transmitted, so that the control information can be transmitted more efficiently than the conventional technology, and when the variable common pilot is not transmitted, the corresponding resource is used for data transmission. This has the advantage of increasing the transmission efficiency of the data signal.

Claims (4)

  1. A data transmission method in a transmitter of a wireless communication system using at least two multiple antennas,
    Determining a number of transmit antennas according to a predetermined transmission mode of data;
    Setting a position of a variable common pilot to a data region according to the number of transmit antennas;
    If the number of transmit antennas is less than or equal to a predetermined number, mapping data to positions of the variable common pilots;
    And transmitting the position information and the data of the variable common pilot to a terminal.
  2. In a transmitter of a wireless communication system using at least two multiple antennas,
    A multi-antenna number selector for determining the number of transmit antennas according to a predetermined transmission mode of data;
    A resource allocator configured to set a location of a variable common pilot according to the number of transmit antennas as a data region and to map data to a location of the variable common pilot when the number of the transmit antennas is less than or equal to a predetermined number;
    A data generator for generating data in consideration of the variable common pilot when the number of transmit antennas is less than or equal to a predetermined number;
    And a transmitter for transmitting the position information and the data of the variable common pilot to a terminal.
  3. A data receiving method in a receiver of a wireless communication system using at least two multiple antennas,
    Receiving transmission structure information and data including whether the variable common pilot is used and location information;
    If a variable common pilot is used based on the transmission structure information, determining and decoding a signal included in the position of the variable common pilot as a variable common pilot;
  4. A data receiving apparatus in a receiver of a wireless communication system using at least two multiple antennas,
    A receiving unit for receiving transmission structure information and data including whether the variable common pilot is used and location information;
    A common pilot extractor for extracting whether to use a variable common pilot and location information based on the transmission structure information;
    And a decoder configured to perform decoding by determining a signal included in a position of the variable common pilot as data when the variable common pilot is not used.
KR1020070027858A 2007-03-21 2007-03-21 Method and apparatus for transmitting/receiving data in wireless communication system KR20080086125A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100096035A (en) * 2009-02-23 2010-09-01 엘지전자 주식회사 Method and apparatus for monitoring control channel in multiple carrier system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100096035A (en) * 2009-02-23 2010-09-01 엘지전자 주식회사 Method and apparatus for monitoring control channel in multiple carrier system

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