KR20060074803A - Method for receiving signal detected by non-corherent detection in broadband wireless access system - Google Patents

Abstract

In a method for receiving a signal capable of non-coherent detection through a subchannel having at least one M * N tile, using primary subcarriers constituting the tile Receiving a signal capable of non-coherent detection and receiving a signal capable of non-coherent detection using second subcarriers constituting the tile. The present invention relates to a signal receiving method capable of non-coherent detection, and when signal detection can be performed through non-coherent detection, another signal can be received instead of a pilot signal. There is an effect that can increase the transmission efficiency.

OFDMA, subcarrier, pilot, non-coherent detection

Description

Method for Receiving Signal Detected by Non-corherent Detection in Broadband Wireless Access System}

1 is a diagram illustrating an embodiment of a radio resource allocation method.

2 is a diagram illustrating a method of allocating a CQICH and an ACKCH zone in an OFDMA uplink.

FIG. 3 is a diagram illustrating a configuration of a tile when a new signal is transmitted using a subcarrier that used a conventional pilot signal. FIG.

4 is a diagram illustrating an embodiment of obtaining a second ACKCH from a CQICH tile structure.

FIG. 5 is a diagram for explaining an embodiment of obtaining a second ACKCH from two ACKCH tile structures; FIG.

FIG. 6 is a diagram illustrating a method of obtaining a second CQICH (Secondary CQICH) from two CQICH tile structures. FIG.

FIG. 7 is a diagram for explaining an embodiment of obtaining a second CQICH from four ACKCH tile structures; FIG.

Exemplary embodiment diagram showing a tile structure for explaining a code word allocation method using an additional subcarrier shown in FIG.

The present invention relates to a broadband wireless access system, and more particularly, to a signal receiving method capable of non-coherent detection applied to an orthogonal frequency division multiple access system. In order to simultaneously use limited radio resources by multiple users, a multiplexing method is required. Multiplexing is a technique of forming a plurality of channels capable of simultaneously transmitting and receiving independent signals by dividing a single line or transmission path. Typical multiplexing schemes include frequency division multiplexing (FDM), which divides one circuit into multiple frequency bands and multiplexes, and multiplexes by dividing one circuit into a plurality of very short time intervals. Time Division Multiplexing (TDM).

Meanwhile, as the demand for multimedia data continuously increases in mobile communication, a multiplexing method for effectively transmitting a large amount of data is required. Orthogonal Frequency Division Multiplexing (OFDM) technique is an example of such a multiplexing method.

OFDM is a digital modulation scheme for improving transmission rate per bandwidth and preventing multipath interference. OFDM is characterized in that it is a multicarrier modulation scheme using a plurality of subcarriers and that each subcarrier is orthogonal. For this reason, the frequency components of each subcarrier may overlap each other. The frequency utilization efficiency is high because much more subcarriers can be multiplexed compared to normal frequency division multiplexing (FDM).

In a mobile communication system based on OFDM, there are OFDM-FDMA (OFDMA), OFDM-TDMA, and OFDM-CDMA according to a multiple access scheme for allocating radio resources to a plurality of users. Orthogonal Frequency Division Multiple Access (OFDMA) is a method of accommodating a plurality of users by allocating a portion of the total subcarriers to each user.

An object of the present invention is to more efficiently perform transmission using a tile structure of OFDMA in a broadband wireless access system.

According to an aspect of the present invention, there is provided a method for receiving a non-coherent detection signal through a subchannel having at least one M * N tile. Receiving a signal capable of non-coherent detection using primary subcarriers constituting a subcarrier and a signal capable of non-coherent detection using second subcarriers constituting a tile Receiving is made.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

A basic description of a communication method of a broadband wireless access system is described in detail in IEEE802.16e and can be referred to for detailed description of the present invention.

1 is a diagram illustrating an embodiment of a radio resource allocation method. In a broadband wireless access system, the basic unit of OFDMA uplink radio resource allocation has a structure as shown in FIG. 1, which is called a tile structure. In the tile structure, a channel quality indication channel (CQICH) or an acknowledgment channel (ACKCH) is a data subcarrier 102, 103, 105, 106, 107, 108, 110, 111, and a pilot channel is transmitted through pilot subcarriers 101, 104, 109, 112. Each subcarrier transmitted through the tile structure is called a component unit of the tile structure.

In general, for data subcarriers, by performing channel estimation based on pilot subcarriers, a coherent detection method is used. However, in ACKCH or CQICH, a non-coherent detection method may be used without channel estimation. On the other hand, in the ACKCH or CQICH, orthogonal code words are used for the non-coherent detection method. Table 1 shows an example of a code word for ACKCH subcarrier modulation when having 1 bit ACK information.

ACK 1-bit symbol Vector indicies per tile Tile (0), Tile (1), Tile (2) 0 0, 0, 0 One 4, 7, 2

Table 2 shows an example of a code word for CQICH subcarrier modulation when having 6 bits of CQI information.

6 bit payload Fast Feedback vedtor indices per tile Tile (0), Tile (1), ..., Tile (5) 0b000000 0, 0, 0, 0, 0, 0 0b000001 1, 1, 1, 1, 1, 1 0b000010 2, 2, 2, 2, 2, 2 0b000011 3, 3, 3, 3, 3, 3 ： ： ： ：

Table 3 shows an example of a code word for CQICH subcarrier modulation when it has 5-bit CQI information.

5 bit payload Fast Feedback vedtor indices per tile Tile (0), Tile (1), ..., Tile (5) 0b00000 0, 0, 0, 0, 0 0b00001 1, 1, 1, 1, 1 0b00010 2, 2, 2, 2, 2 0b00011 3, 3, 3, 3, 3 ： ： ： ：

Table 4 shows an example of a code word for CQICH subcarrier modulation when it has 4-bit CQI information.

4 bit payload Fast Feedback vedtor indices per tile Tile (0), Tile (1), ..., Tile (5) 0b00000 0, 0, 0, 0, 0, 0 0b00001 1, 1, 1, 1, 1, 1 0b00010 2, 2, 2, 2, 2, 2 0b00011 3, 3, 3, 3, 3, 3 ： ： ： ：

As shown in Table 4, a vector designated for each tile consists of eight Quadrature Phase Shift Keying (QPSK) symbols to be transmitted through eight data subcarriers.

Vector Index M _{n, m8} , M _{n, 8m + 1} , ... M _{n, 8m + 7} 0 P0, P1, P2, P3, P0, P1, P2, P3 One P0, P3, P2, P1, P0, P3, P2, P1 2 P0, P0, P1, P1, P2, P2, P3, P3 3 P0, P0, P3, P3, P2, P2, P1, P1 4 P0, P0, P0, P0, P0, P0, P0, P0 5 P0, P2, P0, P2, P0, P2, P0, P2 6 P0, P2, P0, P2, P2, P0, P2, P0 7 P0, P2, P2, P0, P2, P0, P0, P2

In Table 5, P ₀ , P ₁ , P ₂ , and P ₃ are as shown in Equation 1.

One subchannel consists of six tiles. CQICH may use one subchannel, and ACKCH may use 1/2 of a subchannel. That is, the CQICH may use six tiles and the ACKCH may use three tiles.

FIG. 2 is an exemplary diagram illustrating a method of allocating a CQICH and an ACKCH zone in the OFDMA uplink. As shown in FIG. 2, in the uplink two-dimensional map, some zones are pre-assigned to the ACKCH dedicated zone 201 and another zone to the CQICH dedicated zone 202.

Subchannels are designated for the ACKCH zone and the CQICH zone for use by a specific mobile subscriber station (hereinafter, 'MSS'). 2, MSS # 1 indicates ACK # 1, MSS # 2 indicates ACK # 2,... MSS # 8 may specify ACK # 8, MSS # 9 may specify CQICH # 1, MSS # 10 may specify CQICH # 2, CQICH # 3, and MSS # 11 may specify CQICH # 4.

If the base station uses a non-coherent detection scheme, the pilot subcarriers do not need to be used. Therefore, in this case, since four pilot subcarriers allocated to each tile are not used, uplink radio resources and transmission power of the terminal are unnecessarily consumed.

Accordingly, by carrying new information on a subcarrier allocated as a pilot channel in the tile structure of the CQICH and ACKCH, non-coherent detection is performed like the CQICH and ACKCH using a subcarrier carrying a conventional pilot signal. Information using the Detection method can be transmitted.

3 is a diagram illustrating a configuration of a tile when a new signal is transmitted using a subcarrier that has been transmitting a pilot signal. As shown in FIG. 3, new signals may be transmitted using subcarriers 301, 303, 308, and 312 that have previously transmitted pilot signals.

As described above, in a tile structure for CQICH and ACKCH, when a new signal is transmitted to a subcarrier transmitting a pilot signal, the subcarrier transmitting each pilot signal is called an additional subcarrier. By using the additional subcarriers generated by grouping the unit tile structure, in addition to the primary ACKCH and the CQICH, a second CQICH (Secondary CQICH) or a second ACKCH (Secondary ACKCH) can be obtained.

4 is an exemplary diagram illustrating a method of obtaining a second ACKCH from a CQICH tile structure. Referring to FIG. 4, since one CQICH is composed of six tile units and four additional subcarriers can be obtained for each tile unit, a total of 24 additional subcarriers can be obtained for one CQICH. Will be. On the other hand, since the ACKCH is composed of three tile units and each subcarrier has eight subcarriers, one ACKCH can be configured using 24 subcarriers. Therefore, one ACKCH (second ACKCH) can be configured using 24 additional subcarriers obtained from one CQICH.

5 is an exemplary diagram illustrating a method of obtaining a second ACKCH from two ACKCH tile structures. Referring to FIG. 5, since one ACKCH is composed of three tile units and four additional subcarriers can be obtained for each tile unit, a total of 24 additional subcarriers can be obtained for two ACKCHs. Meanwhile, since one ACKCH may be configured using 24 subcarriers, as shown in FIG. 5, when an additional subcarrier is obtained using two ACKCHs as one group, one ACKCH (second ACKCH) is configured. You can do it.

FIG. 6 is an exemplary diagram illustrating a method of obtaining a second CQICH from two CQICH tile structures. Referring to FIG. 6, since one CQICH is composed of six tile units and four additional subcarriers can be obtained for each tile unit, a total of 48 additional subcarriers can be obtained for two CQICHs. On the other hand, since the CQICH is composed of six tile units and each subcarrier has eight subcarriers, one CQICH may be configured using 48 subcarriers. Accordingly, one CQICH (second CQICH) may be configured using 48 additional subcarriers obtained from two CQICHs.

FIG. 7 is an exemplary diagram illustrating a method of obtaining a second CQICH from four ACKCH tile structures. Referring to FIG. 7, since one ACKCH is composed of three tile units and four additional subcarriers can be obtained for each tile unit, a total of 48 additional subcarriers can be obtained for four ACKCHs. On the other hand, since the CQICH is composed of six tile units and each subcarrier has eight subcarriers, one CQICH may be configured using 48 subcarriers. Accordingly, one CQICH (second CQICH) may be configured using 48 additional subcarriers obtained from four ACKCHs.

To assign a code word to a subcarrier, the following method can be used. As a first embodiment, codewords can be allocated as shown in Tables 6 to 9, with 12 tiles constituting one CQICH or two ACKCHs as one set.

Table 6 shows an example of code word allocation for second ACKCH subcarrier modulation when having 1 bit ACK information.

additional ACKCH 1-bit symbol Vector indicies per tile (Tile (0), Tile (1)), (Tile (2), Tile (3)), (Tile (4), Tile (5)) 0 0, 0, 0 One 4, 7, 2

Table 7 shows an example of code word allocation for CQICH subcarrier modulation in case of 6 bit CQI information.

6 bit payload Fast Feedback vedtor indices per tile (Tile (0), Tile (1)), (Tile (2), Tile (3)), (Tile (4), Tile (5)), ... (Tile (10) , Tile (11)) 0b000000 0, 0, 0, 0, 0, 0 0b000001 1, 1, 1, 1, 1, 1 0b000010 2, 2, 2, 2, 2, 2 0b000011 3, 3, 3, 3, 3, 3 ： ： ： ：

Table 8 shows an example of a code word for CQICH subcarrier modulation when it has 5-bit CQI information.

5 bit payload Fast Feedback vedtor indices per tile (Tile (0), Tile (1)), (Tile (2), Tile (3)), (Tile (4), Tile (5)), ... (Tile (10) , Tile (11)) 0b00000 0, 0, 0, 0, 0 0b00001 1, 1, 1, 1, 1 0b00010 2, 2, 2, 2, 2 0b00011 3, 3, 3, 3, 3 ： ： ： ：

Table 9 shows an example of a code word for CQICH subcarrier modulation when it has 4-bit CQI information.

4 bit payload Fast Feedback vedtor indices per tile (Tile (0), Tile (1)), (Tile (2), Tile (3)), (Tile (4), Tile (5)), ... (Tile (10) , Tile (11)) 0b00000 0, 0, 0, 0, 0, 0 0b00001 1, 1, 1, 1, 1, 1 0b00010 2, 2, 2, 2, 2, 2 0b00011 3, 3, 3, 3, 3, 3 ： ： ： ：

On the other hand, as a second embodiment, code words can be allocated to each of 12 tiles constituting one CQICH or two ACKCHs as shown in Tables 10 to 11.

Table 10 shows an example of code word allocation for second ACKCH subcarrier modulation when having 1 bit ACK information.

additional ACK 1-bit symbol Vector indicies per tile Tile (0), Tile (1), Tile (2), Tile (3), Tile (4), Tile (5) 0 a, a, a, a, a, a One b, b, b, b, b, b

additional CQICH 6bit, 5bit and 4bit payload Fast Feedback vedtor indices per tile Tile (0), Tile (1), Tile (2), Tile (3), Tile (4), Tile (5), ... Tile (10), Tile (11) 0b000000, 0b00000, 0b0000 a, a, a, a, a, a, a, a, a, a, a, a 0b000001, 0b00001, 0b0001 b, b, b, b, b, b, b, b, b, b, b, b 0b000010, 0b00001, 0b0001 c, c, c, c, c, c, c, c, c, c, c, c 0b000011, 0b00011, 0b0011 d, d, d, d, d, d, d, d, d, d, d, d

The additional subcarriers of the tiles applied to the code word allocation shown in Table 11 are as shown in FIG.

In the code word allocation method using the additional subcarriers shown in FIG. 8, as shown in Table 12, a vector designated for each tile includes four modulation symbols in order to be transmitted through four additional subcarriers.

Vector Index M _{n, 4m} , M _{n, 4m + 1} , M _{n, 4m + 2} , M _{n, 4m + 3} a P0, P0, P0, P0 b P0, P1, P2, P3 c P0, P2, P0, P2 d P1, P0, P3, P2

The second ACKCH may be configured using 24 subcarriers allocated to the pilot, and the method of configuring the ACKCH using 24 pilot subcarriers may be configured in various ways using additional subcarriers in addition to the methods shown in FIGS. 9 and 10. can do.

The second ACKCH can be configured using three tiles, and Table 13 shows an example of possible code words in this case.

Secondary ACK 1-bit symbol Vector indices per tile Tile (0), Tile (1), Tile (2) 0 a, a, a One b, b, b

The second CQICH may be configured using 48 pilot subcarriers, and a method of configuring a CQICH using 48 pilot subcarriers may be configured in various ways using additional subcarriers in addition to the methods of FIGS. 6 and 7.

The second CQICH can be configured using six tiles, and Table 14 shows an example of possible code words in this case.

Secondary CQICH 4 bit payload Vector indicies per tile Tile (0), Tile (1), Tile (2), Tile (3), Tile (4), Tile (5) Secondary CQICH 4 bit payload Vector indicies per tile Tile (0), Tile (1), Tile (2), Tile (3), Tile (4), Tile (5) 0b0000 a, a, a, b, b, b 0b1000 a, a, b, d, c, c 0b0001 b, b, b, a, a, a 0b1001 b, d, c, c, d, b 0b0010 c, c, c, d, d, d 0b1010 c, c, d, b, a, a 0b0011 d, d, d, c, c, c 0b1011 d, d, b, a, b, b 0b0100 a, b, c, d, a, b 0b1100 a, a, d, c, a, d 0b0101 b, c, d, a, b, d 0b1101 b, c, a, c, c, a 0b0110 c, d, a, b, c, d 0b1110 c, b, d, d, b, c 0b0111 d, a, b, c, d, a 0b1111 d, c, c, b, b, c

Meanwhile, the new code word may be configured as shown in Table 15 using the BPSK.

Vector Index M _{n, 4m} , M _{n, 4m + 1} , M _{n, 4m + 2} , M _{n, 4m + 3} a 1, 1, 1, 1 b 1, -1, 1, -1 c 1, 1, -1, -1 d 1, -1, -1, 1

The base station may use a message shown in Table 16 to inform the mobile station of information about the second ACKCH.

Syntax Size (bits) Notes Compact_UL_MAP_IE () {   UL-MAP Type 3 Type = 7   UL-MAP Sub-type 5 Sub-type = 3   Length 4 Length of the IE bytes   Primary / Secondary H-ARQ Region Change Indication One 0 = no region chanbge 1 = region change   If (Primary / Secondary H-ARQ Region Change indication == 1) {     OFDMA Symbol Offset 8     Subchannel Offset 8     No.OFDMA Symbols 8     No.Subchannels 8    }    Reserved 3   }

In the message shown in Table 16, the UL-MAP Type and Sub-type fields are fields indicating the type of the message. That is, the terminal can know what the contents of the message are through the two fields. Meanwhile, the Length field indicates the size of the entire message including the Length field in bytes.

The Primary / Secondary H-ARQ Region Change Indication field has a value of 1 when the H-ARQ region is different from the previous frame or when there is another H-ARQ region in the same frame. The OFDMA symbol offset and subchannel offset fields indicate the coordinates where the H-ARQ region starts in the uplink on a time axis (symbol) and a frequency axis (subchannel) basis. No. OFDMA symbols and No. The subchannels field is a field for indicating the size occupied by the H-ARQ region in the time axis and the frequency axis in the uplink.

On the other hand, the base station may use the message shown in Table 17 to inform the mobile station of the information on the second CQICH.

Syntax Size (bits) Notes Compact_UL_MAP_IE () {   UL-MAP Type 3 Type = 7   UL-MAP Sub-type 5 Sub-type = 3   Length 4 Length of the IE bytes   Primary / Secondary H-ARQ Region Change Indication One 0 = no region chanbge   If (Primary / Secondary H-ARQ Region Change indication == 1) { 1 = region change     OFDMA Symbol Offset 8     Subchannel Offset 8     No.OFDMA Symbols 8     No.Subchannels 8    }    Reserved 3   }

In the message shown in Table 17, the UL-MAP Type and Sub-type fields are fields indicating the type of the message, and the mobile station can know what the contents of the message are through the two fields. The Length field is a field for indicating the size of the entire message including the Length field in bytes.

Meanwhile, the Primary / Secondary CQICH Region Change Indication field has a value of 1 when the CQICH region is different from the previous frame or when there is another CQICH region in the same frame. The OFDMA symbol offset and the subchannel offset inform the coordinates of the start of the CQICH region in the uplink in the time axis (symbol) and frequency axis (subchannel) units. No. OFDMA symbols and No. The subchannels field indicates the size occupied by the CQICH region in the uplink in the time and frequency units.

The information transmitted through the second CQICH according to the present invention may be used as follows according to a feedback type. First, when transmitting information about the SNR to the base station, it may be payload in the same manner as in Equation 2.

On the other hand, when used for the Multi-Input Multi-Output (MIMO) mode selection, it may be payload as shown in the example of Table 18.

Value Description 0b0000 STTD and PUSC / FUSC permutation 0b0001 STTD and adjacent-subcarrier permutation 0b0010 SM and PUSC / FUSC permutation 0b0011 SM and adjacent-subcarrier permutation 0b0100 Closed-loop SM and PUSC / FUSC permutation 0b0101 Closed-loop SM and adjacent-subcarrier permutation 0b0110 Closed-loop SM + Beamforming and adjacent-subcarrier permutation 0b0111-0b1111 Interpretation according to table 296e, 296f or 296g, depending on if antenna grouping, antenna selection or a reduced precoding matrix code book is used.

Table 19 is an example of the antenna grouping method corresponding to each value in Table 18.

Value Description 0b0111 Antenna Group A1 for rate 1 For 3-antenna BS, See 8.4.8.3.4 For 4-antenna BS, See 8.4.8.3.5 0b1000 Antenna Group A2 for rate 1 0b1001 Antenna Group A3 for rate 1 0b1010 Antenna Group B1 for rate 2 For 3-antenna BS, See 8.4.8.3.4 For 4-antenna BS, See 8.4.8.3.5 0b1011 Antenna Group B2 for rate 2 0b1100 Antenna Group B3 for rate 2 0b1101 Antenna Group B4 for rate 2 (only for 4-antenna BS) 0b1110 Antenna Group B5 for rate 2 (only for 4-antenna BS) 0b1111 Antenna Group B6 for rate 2 (only for 4-antenna BS)

Table 20 is an example of the antenna selection method corresponding to each value in Table 18.

Value Description 0b0111 Antenna selection option 0 0b1000 Antenna selection option 1 0b1001 Antenna selection option 2 0b1010 Antenna selection option 3 0b1011 Antenna selection option 4 0b1100 Antenna selection option 5 0b1101 Antenna selection option 6 0b1110 Antenna selection option 7 0b1111 Reserved

Table 21 shows an example of a method of using a reduced precoding matrix codebook corresponding to each value in Table 18.

Value Description 0b0111 Reduced Precoding matrix code book entry 0 0b1000 Reduced Precoding matrix code book entry 1 0b1001 Reduced Precoding matrix code book entry 2 0b1010 Reduced Precoding matrix code book entry 3 0b1011 Reduced Precoding matrix code book entry 4 0b1100 Reduced Precoding matrix code book entry 5 0b1101 Reduced Precoding matrix code book entry 6 0b1110 Reduced Precoding matrix code book entry 7 0b1111 Reserved

The base station transmits information about the feedback type to the mobile station through CQICH_Enhanced_Alloc_IE.

Table 22 and Table 23 are examples of part of CQICH_Enhanced_Alloc_IE including information about the feedback type.

CQICH_Enhanced_Alloc_IE () { ... ... ... Feedback type 3 bits 0b000 = Fast DL Measurement 0b001 = MIMO Mode selection / Antenna Grouping 0b010 = MIMO Mode selection / Antenna Selection 0b011 = MIMO Mode selection / Reduced Codebook 0b100 = Quantized precoding weight feedback 0b101 = Index to precoding matrix in codebook 0b110 = Channel Matrix Information 0b111 = Per stream power control ... ... ...

CQICH_Enhanced_Alloc_IE () { ... ... ... Feedback type 3 bits 0b000 = Fast DL measurement / Antenna grouping for 6bit payload = Fast DL measurement for 4bit payload 0b001 = Fast DL measurement / Antenna selection for 6bit payload = MIMO mode / Antenna grouping for 4bit payload 0b010 = Fast DL measurement / Reduced codebook for 6bit payload = Antenna selection / Reduced Codebook for 4bit payload 0b011 = Quantized precoding weight feedback 0b100 = Index to precoding matrix in codebook 0b101 = Channel Matrix Information 0b110 = Per stream power control 0b111 = reserved

On the other hand, the information transmitted through the second CQICH (Secondary CQICH) according to the present invention, when only transmitting information about the SNR to the base station, it may be payload in the same manner as in Equation 3.

Information about the feedback type for transmitting only information about the SNR to the base station is transmitted to the mobile station through the CQICH_Enhanced_Alloc_IE. Table 24 shows an example of a part of CQICH_Enhanced_Alloc_IE including information about the feedback type.

CQICH_Enhanced_Alloc_IE () { ... ... ... Feedback type 3 bits 0b000 = Fast DL measurement / Antenna grouping for 6bit payload = Fast DL measurement for 4bit payload 0b001 = Fast DL measurement / Antenna selection for 6bit payload = Fast DL measurement for 4bit payload 0b010 = Fast DL measurement / Reduced codebook for 6bit payload = Fast DL measurement for 4bit payload 0b011 = Quantized precoding weight feedback 0b100 = Index to precoding matrix in codebook 0b101 = Channel Matrix Information 0b110 = Per stream power control 0b111 = reserved ... ... ...

Meanwhile, information transmitted through the second CQICH according to the present invention may be used as follows according to a feedback type. That is, the second CQICH may be used only for MIMO mode selection. If the second CQICH is used only for MIMO mode selection, it may be payloaded as shown in Table 25.

Value Description 0b0000 STTD and PUSC / FUSC permutation 0b0001 STTD and adjacent-subcarrier permutation 0b0010 SM and PUSC / FUSC permutation 0b0011 SM and adjacent-subcarrier permutation 0b0100 Closed-loop SM and PUSC / FUSC permutation 0b0101 Closed-loop SM and adjacent-subcarrier permutation 0b0110 Closed-loop SM + Beamforming and adjacent-subcarrier permutation 0b0111-0b1111 Interpretation according to table 296e, 296f or 296g, depending on if antenna grouping, antenna selection or a reduced precoding matrix code book is used.

Table 26 is an example of the antenna grouping method corresponding to each value in Table 25.

Value Description 0b0111 Antenna Group A1 for rate 1 For 3-antenna BS, See 8.4.8.3.4 For 4-antenna BS, See 8.4.8.3.5 0b1000 Antenna Group A2 for rate 1 0b1001 Antenna Group A3 for rate 1 0b1010 Antenna Group B1 for rate 2 For 3-antenna BS, See 8.4.8.3.4 For 4-antenna BS, See 8.4.8.3.5 0b1011 Antenna Group B2 for rate 2 0b1100 Antenna Group B3 for rate 2 0b1101 Antenna Group B4 for rate 2 (only for 4-antenna BS) 0b1110 Antenna Group B5 for rate 2 (only for 4-antenna BS) 0b1111 Antenna Group B6 for rate 2 (only for 4-antenna BS)

Table 27 is an example of the antenna selection method corresponding to each value in Table 25.

Value Description 0b0111 Antenna selection option 0 0b1000 Antenna selection option 1 0b1001 Antenna selection option 2 0b1010 Antenna selection option 3 0b1011 Antenna selection option 4 0b1100 Antenna selection option 5 0b1101 Antenna selection option 6 0b1110 Antenna selection option 7 0b1111 Reserved

Table 28 is an example showing a method of using a reduced precoding matrix codebook corresponding to each value in Table 25.

Value Description 0b0111 Reduced Precoding matrix code book entry 0 0b1000 Reduced Precoding matrix code book entry 1 0b1001 Reduced Precoding matrix code book entry 2 0b1010 Reduced Precoding matrix code book entry 3 0b1011 Reduced Precoding matrix code book entry 4 0b1100 Reduced Precoding matrix code book entry 5 0b1101 Reduced Precoding matrix code book entry 6 0b1110 Reduced Precoding matrix code book entry 7 0b1111 Reserved

The base station transmits information about the feedback type to the mobile station through CQICH_Enhanced_Alloc_IE.

Table 29 shows an example of part of CQICH_Enhanced_Alloc_IE including information about the feedback type.

CQICH_Enhanced_Alloc_IE () { ... ... ... Feedback type 3 bits 0b000 = Fast DL measurement / Antenna grouping for 6bit payload = MIMO mode / Antenna grouping for 4bit payload 0b001 = Fast DL measurement / Antenna selection for 6bit payload = MIMO mode / Antenna selection for 4bit payload 0b010 = Fast DL measurement / Reduced codebook for 6bit payload = MIMO mode / Reduced codebook for 4bit payload 0b011 = Quantized precoding weight feedback 0b100 = Index to precoding matrix in codebook 0b101 = Channel Matrix Information 0b110 = Per stream power control 0b111 = reserved ... ... ...

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

When signal detection can be performed through non-coherent detection, another signal can be transmitted instead of a pilot signal, thereby increasing transmission efficiency.

Claims (10)

In a method for receiving a signal capable of non-coherent detection through a sub-channel having at least one M * N tile, Receiving a signal capable of non-coherent detection using primary subcarriers constituting the tile; And Receiving a signal capable of non-coherent detection by using the second subcarriers forming the tile Signal receiving method capable of non-coherent detection comprising a. The method of claim 1, The signal received using the main subcarriers is either an ACK / NACK signal or a Channel Quality Indication (CQI) signal. Receiving possible signal. The method of claim 2, The signal received using the second subcarriers is either an acknowledgment (ACK / NACK) signal or a channel quality indication (CQI) signal. Signal reception method with coherent detection. The method of claim 3, wherein M is 3, and N is 4, non-coherent detection capable of non-coherent detection. The method of claim 4, wherein The second subcarriers are subcarriers corresponding to (1,1), (1,3), (4,1), and (4,4). Possible signal reception method. The method of claim 5, A method for receiving non-coherent detection, comprising: receiving an acknowledgment (ACK / NACK) signal using 24 second subcarriers included in one subchannel. The method of claim 5, Non-coherent detection (CQI) signal receiving method characterized in that for receiving a channel quality indication (CQI) signal using the 48 second sub-carriers included in the two sub-channels . The method of claim 3, wherein Receiving information regarding a feedback type, And a non-coherent detection method according to the feedback type, wherein the channel state indication signal is transmitted using second subcarriers. The method of claim 8, The feedback type may include at least one of a signal-to-noise ratio (SNR) and a multi-input multi-output (MIMO) mode selection. Receiving possible signal. The method of claim 8, The information about the feedback type is transmitted through CQICH_Enhanced_Alloc_IE, and non-coherent detection is possible.

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