CN102468925B

CN102468925B - Precoding matrix index reporting and precoding processing method, system and apparatus thereof

Info

Publication number: CN102468925B
Application number: CN201010538368.5A
Authority: CN
Inventors: 荆梅芳; 高秋彬; 张然然; 拉盖施; 肖国军
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2010-11-09
Filing date: 2010-11-09
Publication date: 2014-05-28
Anticipated expiration: 2030-11-09
Also published as: CN102468925A

Abstract

The embodiment of the invention discloses a precoding matrix index reporting and precoding processing method, a system and an apparatus thereof and relates to the wireless communication technology field. The method, the system and the apparatus are used to save resource costs occupied by a terminal which reports the precoding matrix. The method is characterized in that: the terminal determines an antenna port number and a precoding matrix index table corresponding to a rank indication (RI) value; the terminal acquires a mapping relation between a compressed code word index and an original code word index and selects precoding matrixes corresponding to the original code word index which is mapped by the compressed code word index to be the current available precoding matrixes; one precoding matrix is selected from the current available precoding matrixes and the compressed code word index corresponding to the precoding matrix is determined; the compressed code word index is reported to a base station, wherein a bit number used by the reporting is not greater than the bit number which can express the precoding matrixes corresponding to all the compressed code word indexes which are comprised by the mapping relation. By using the method, the system and the apparatus of the invention, the resource costs occupied by the terminal which reports the precoding matrixes can be saved.

Description

Precoding matrix index reporting and precoding processing method, system and device

Technical Field

The present invention relates to the field of wireless communications, and in particular, to a method, a system, and an apparatus for reporting a precoding matrix index and processing precoding.

Background

In a Multiple-Input Multiple-Output (MIMO) system, if a transmitter can acquire channel information in a certain manner, a transmitted signal can be optimized according to channel characteristics, thereby improving reception quality and reducing a requirement for receiver complexity. In an actual system, channel information is generally fed back in a manner of quantizing the channel information, so as to reduce feedback overhead and improve system transmission efficiency.

An implicit CSI (channel State information) feedback method based on a codebook is adopted in a Long Term Evolution (LTE) system. A terminal (UE) measures a downlink Channel based on a pilot, and reports, according to its own receiving and processing algorithm, a number of data streams (Rank Indication, RI) that can be supported by a downlink and a Precoding Matrix Index (PMI) to a base station, and meanwhile, the UE needs to report Channel Quality (CQI) of each codeword. In the CQI calculation process, the UE assumes that the base station (eNB) uses the RI and PMI reported by the base station.

In the LTE system, the PMI is defined as follows:

for 2 antenna ports {0, 1} and corresponding RI value of 1, PMI value n ∈ { (0, 1, 2, 3} corresponds to codebook index n in υ ═ 1 in table 1;

for 2 antenna ports {0, 1} and corresponding RI value of 2, PMI value n ∈ {0, 1} corresponds to codebook index n +1 in υ ═ 2 in table 1;

for 4 antenna ports {0, 1, 2, 3} and corresponding RI values of 1, 2, 3, or 4, PMI value n ∈ { (0, 1, L, 15} corresponds to codebook index n in table 2 where v equals RI value.

TABLE 1

TABLE 2

Wherein,

i is a 4 x 4 dimensional unit matrix,

represents u_nThe conjugate transpose of (c).

Implicit CSI feedback method based on codebook is still adopted in long term evolution advanced (LTE-A) system. In order to improve the feedback accuracy of PMIs, in the LTE-a system, one precoding matrix (W) is combined by two matrices (W1 and W2), and W1 and W2 are indicated by two PMIs (PMI1 and PMI2), respectively. Wherein, a codebook in LTE R8/9 version is adopted for 2 antenna ports and 4 antenna ports, W1 is defined as a unit matrix, and PMI1 contains 0-bit information without feedback. Specifically, the precoding matrix definitions for 8 antenna ports are shown in tables 3-10.

TABLE 3

TABLE 4

TABLE 5

TABLE 6

TABLE 7

TABLE 8

TABLE 9

Watch 10

Wherein,v_m＝[1 e^j2πm/32 e^j4πm/32 e^j6πm/32]^T，(·)^Trepresenting a matrix transposition.

The PMI is defined as follows:

for 8 antenna ports and corresponding RI value of 1, PMI1 value i₁E {0, 1, 2, L, 15} corresponds to codebook index i in Table 3₁PMI2 value i₂E { (0, 1, 2, L, 15} corresponds to codebook index i in Table 3₂；

For 8 antenna ports and corresponding RI value of 2, PMI1 value i₁E {0, 1, 2, L, 15} corresponds to codebook index i in Table 4₁PMI2 value i₂E { (0, 1, 2, L, 15} corresponds to codebook index i in Table 4₂；

For 8 antenna ports and corresponding RI value of 3, PMI1 value i₁E {0, 1, 2, 3} corresponds to codebook index i in Table 5₁PMI2 value i₂E { (0, 1, 2, L, 15} corresponds to codebook index i in Table 5₂；

For 8 antenna ports and corresponding RI value of 4, PMI1 value i₁E {0, 1, 2, 3} corresponds to codebook index i in Table 6₁PMI2 value i₂E {0, 1, 2, L, 7} corresponds to codebook index i in Table 6₂。

In an LTE-A system, a Physical Uplink Shared Channel (PUSCH)3-2 feedback mode needs to be supported, and compared with the feedback mode 3-1 which is already supported, the feedback mode 3-2 needs to additionally feed back a subband PMI, so that the feedback precision of channel information is improved, and the performance of a Single User (SU) and Multiple Users (MU) is enhanced. However, the overhead required for feeding back the subband PMI is relatively large, especially when the system bandwidth is relatively large. Taking 10MHz bandwidth as an example, table 11 is a comparison of the overhead of PUSCH feedback modes 3-1 and 3-2 under different Rank numbers when an 8-antenna port codebook is not compressed.

TABLE 11

As can be seen from Table 11, the feedback overhead is significantly increased after the subband PMI is introduced in the mode 3-2, which is about 1.5-2 times of the overhead of the mode 3-1.

In the process of implementing the invention, the inventor finds that the following technical problems exist in the prior art:

as can be seen from table 3-table 6 in the above table, in the 8-antenna port scenario of the LTE-a system, if RI is 1, 2, or 3, the terminal needs to use at least 4 bits to report PMI2, and if RI is 4, the terminal needs to use at least 3 bits to report PMI2, so that the resource overhead occupied by the terminal in transmitting PMI2 is large.

Disclosure of Invention

The embodiment of the invention provides a precoding matrix index reporting method and a precoding matrix index reporting device, which are used for saving the resource overhead occupied by a terminal for reporting a precoding matrix.

A precoding matrix index reporting method comprises the following steps:

the terminal determines a precoding matrix index table corresponding to the number of current antenna ports and the rank RI value;

the terminal acquires a preset mapping relation between a compressed code word index and an original code word index, and selects a pre-coding matrix corresponding to the original code word index mapped by the compressed code word index from the pre-coding matrix index table as a currently available pre-coding matrix; the number of compressed codeword indexes contained in the mapping relation satisfies the following conditions: the bit number required for representing the precoding matrix corresponding to all the compressed code word indexes contained in the mapping relation is less than the bit number required for representing all the corresponding original precoding matrixes in the precoding matrix index table;

the terminal selects a precoding matrix from the current available precoding matrices according to the channel state information and determines a compressed code word index corresponding to the precoding matrix;

and the terminal reports the compressed code word index to the base station, and the reported bit number is not more than the bit number required by a precoding matrix which can represent all the compressed code word indexes contained in the mapping relation.

A precoding matrix index reporting device, the device comprising:

an index table determining unit, configured to determine a precoding matrix index table corresponding to the current antenna port number and the rank RI value;

the usable matrix selecting unit is used for acquiring a preset mapping relation between a compressed code word index and an original code word index, and selecting a precoding matrix corresponding to the original code word index mapped by the compressed code word index from the precoding matrix index table as a currently usable precoding matrix; the number of compressed codeword indexes contained in the mapping relation satisfies the following conditions: the bit number required for representing the precoding matrix corresponding to all the compressed code word indexes contained in the mapping relation is less than the bit number required for representing all the corresponding original precoding matrixes in the precoding matrix index table;

an index determining unit, configured to select a precoding matrix from currently available precoding matrices according to channel state information, and determine a compressed codeword index corresponding to the precoding matrix;

and an index reporting unit, configured to report the compressed codeword index to a base station, where a number of bits used for reporting is not greater than a number of bits required to represent precoding matrices corresponding to all compressed codeword indexes included in the mapping relationship.

In the scheme, when the terminal selects the currently available precoding matrix, the terminal selects the precoding matrix corresponding to the original codeword index in the mapping relation between the preset compressed codeword index and the original codeword index as the currently available precoding matrix instead of selecting all precoding matrices in the determined precoding matrix index table; because the bit number required for representing the precoding matrix corresponding to all the compressed codeword indexes contained in the mapping relation is less than the bit number required for representing all the corresponding original precoding matrices in the precoding matrix index table, and the bit number used for reporting the compressed codeword indexes by the terminal is not more than the bit number required for representing the precoding matrix corresponding to all the compressed codeword indexes contained in the mapping relation, the bit number actually used when the terminal reports the compressed codewords is less than the bit number required for representing all the original precoding matrices in the precoding matrix index table, that is, the bit number used for reporting the PMI by the terminal in the invention is less than the bit number used when the PMI is reported in the prior art, thereby saving the resource overhead occupied by the PMI reported by the terminal.

The embodiment of the invention provides a precoding processing method, a device and a system, which are used for ensuring that a base station can still correctly acquire a precoding matrix indicated by a terminal under the condition that the corresponding relation between a code word index and the precoding matrix occurs.

A method of precoding, the method comprising:

a base station receives a compressed code word index reported by a terminal;

the base station determines an original code word index corresponding to the received compressed code word index according to a preset mapping relation between the compressed code word index and the original code word index;

the base station determines a precoding matrix corresponding to the original code word index by searching a precoding matrix index table corresponding to the current antenna port number and the rank RI value reported by the terminal;

and the base station performs precoding processing on downlink transmission data by using the precoding matrix.

A precoding processing apparatus, the apparatus comprising:

the index receiving unit is used for receiving the compressed code word index reported by the terminal;

the original index determining unit is used for determining an original code word index corresponding to the received compressed code word index according to the preset mapping relation between the compressed code word index and the original code word index;

a matrix determining unit, configured to determine a precoding matrix corresponding to the original codeword index by searching for a precoding matrix index table corresponding to a current antenna port number and a reported rank RI value;

and the precoding unit is used for precoding downlink transmission data by utilizing the precoding matrix.

A wireless communication system, the system comprising:

the terminal is used for determining a precoding matrix index table corresponding to the current antenna port number and the rank RI value; acquiring a preset mapping relation between a compressed code word index and an original code word index, and selecting a pre-coding matrix corresponding to the original code word index mapped by the compressed code word index from the pre-coding matrix index table as a currently available pre-coding matrix; the number of compressed codeword indexes contained in the mapping relation satisfies the following conditions: the bit number required for representing the precoding matrix corresponding to all the compressed code word indexes contained in the mapping relation is less than the bit number required for representing all the corresponding original precoding matrixes in the precoding matrix index table; selecting a precoding matrix from the current available precoding matrices, and determining a compressed code word index corresponding to the precoding matrix; reporting the compressed code word index to a base station, wherein the reported bit number is not more than the bit number required by a precoding matrix corresponding to all the compressed code word indexes contained in the mapping relation;

the base station is used for receiving the compressed code word index reported by the terminal; determining an original code word index corresponding to the received compressed code word index according to a preset mapping relation between the compressed code word index and the original code word index; determining a precoding matrix corresponding to the original code word index by searching a precoding matrix index table corresponding to the current antenna port number and the reported RI value; and precoding downlink transmission data by using the precoding matrix.

In the scheme of the invention, a base station receives a compressed code word index reported by a terminal, and determines an original code word index corresponding to the received compressed code word index according to a preset mapping relation between the compressed code word index and the original code word index; and determining a precoding matrix corresponding to the original code word index by searching a precoding matrix index table corresponding to the current antenna port number and the reported RI value, and performing precoding processing on downlink transmission data by using the precoding matrix. Therefore, by adopting the scheme, under the condition that the corresponding relation between the code word index and the precoding matrix is changed, the base station can still correctly acquire the precoding matrix indicated by the terminal according to the preset mapping relation between the compressed code word index and the original code word index, and then can perform precoding processing on downlink transmission data according to the precoding matrix.

Drawings

FIG. 1 is a schematic flow chart of a method provided by an embodiment of the present invention;

FIG. 2 is a schematic flow chart of another method provided by the embodiment of the present invention;

FIG. 3 is a schematic diagram of a system according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an apparatus according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of another apparatus according to an embodiment of the present invention.

Detailed Description

In order to save resource overhead occupied by terminal PMI transmission, the embodiment of the invention provides a precoding matrix index reporting method.

Referring to fig. 1, an embodiment of the present invention provides a precoding matrix index reporting method, including the following steps:

step 10: the terminal determines a precoding matrix index table corresponding to the current antenna port number and RI value;

step 11: the terminal acquires a preset mapping relation between a compressed code word index and an original code word index, and selects a pre-coding matrix corresponding to the original code word index mapped by the compressed code word index in the mapping relation from the pre-coding matrix index table as a currently available pre-coding matrix; the number of compressed codeword indexes contained in the mapping relation satisfies the following conditions: the bit number required for representing the precoding matrix corresponding to all the compressed code word indexes contained in the mapping relation is less than the bit number required for representing all the corresponding original precoding matrixes in the precoding matrix index table;

here, the precoding matrix corresponding to the compressed codeword index is a precoding matrix corresponding to the original codeword index mapped to the compressed codeword index in the precoding matrix index table.

Step 12: the terminal selects a precoding matrix from the current available precoding matrices according to the channel state information, and determines a compressed code word index corresponding to the precoding matrix;

here, the terminal selects one precoding matrix from the currently available precoding matrices according to the channel state information in the same manner as the precoding matrix is selected from the currently available precoding matrices in the related art.

Step 13: and the terminal reports the compressed code word index to the base station, and the reported bit number is not more than the bit number required by a precoding matrix which can represent all the compressed code word indexes contained in the mapping relation. For example, the number of bits used by the terminal to report may be equal to the number of bits required by the precoding matrix corresponding to all compressed codeword indexes included in the mapping relationship.

In the method, when the current number of antenna ports is 8 and the RI value is 1, the mapping relationship between the compressed codeword index and the original codeword index may include the following two types:

in the first scheme, the number of bits used by the terminal to report the compressed codeword index is 3, and at this time:

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝i′₂，i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝i′₂+4，i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝i′₂+8，i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝2i′₂，i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0, 1, 2, 3, then i₂＝i′₂If i'₂Taking the values in 4, 5, 6 and 7, then i₂＝i′₂+ 4; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0, 1, 2, 3, then i₂＝i′₂If i'₂Taking the values in 4, 5, 6 and 7, then i₂＝i′₂+ 8; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0, 1, 2, 3, then i₂＝i′₂+4, if'₂Taking the values in 4, 5, 6 and 7, then i₂＝i′₂+8。

In the second, the number of bits used by the terminal to report the compressed codeword index is 2, and at this time:

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝i′₂，i′₂Values in 0, 1, 2, 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝i′₂+4，i′₂Values in 0, 1, 2, 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝i′₂+8，i′₂Values in 0, 1, 2, 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝i′₂+12，i′₂Values in 0, 1, 2, 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝2i′₂，i′₂Values in 0, 1, 2, 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝2i′₂+4，i′₂Values in 0, 1, 2, 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝2i′₂+8，i′₂Values in 0, 1, 2, 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝2i′₂If i'₂Taking the values in 2 and 3, then i₂＝2i′₂+ 4; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝2i′₂If i'₂Taking the values in 2 and 3, then i₂＝2i′₂+ 8; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝2i′₂+4, if'₂Taking the values in 2 and 3, then i₂＝2i′₂+8。

When the current number of antenna ports is 8 and the RI value is 2, the mapping relationship between the compressed codeword index and the original codeword index may include the following two types:

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝i′₂+8，i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7.

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝i′₂+2，i′₂Values in 0, 1, 2, 3; or,

compressionCodeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝i′₂If i'₂Taking the values in 2 and 3, then i₂＝i′₂+ 2; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝i′₂If i'₂Taking the values in 2 and 3, then i₂＝i′₂+ 6; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝4i′₂If i'₂Taking the values in 2 and 3, then i₂＝2i′₂+ 4; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝i′₂+4, if'₂Taking the values in 2 and 3, then i₂＝i′₂+8。

When the current number of antenna ports is 8 and the RI value is 3, the mapping relationship between the compressed codeword index and the original codeword index may include the following two types:

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝2i′₂-(i′₂imod 2)，i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝2(i′₂+1)-(i′₂mod 2)，i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝2i′₂+1，i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝2i′₂+(i′₂mod 2)，i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝2i′₂+((i′₂+1)mod 2)，i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0, 1, 2, 3, then i₂＝i′₂+4, if'₂Taking the values in 4, 5, 6 and 7, then i₂＝i′₂+ 8; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝4i′₂，i′₂Values in 0, 1, 2, 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝4i′₂+1，i′₂Values in 0, 1, 2, 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝4i′₂+2，i′₂Values in 0, 1, 2, 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝4i′₂+3，i′₂Values in 0, 1, 2, 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝i′₂+4, if'₂Taking the values in 2 and 3, then i₂＝i′₂+ 10; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝i′₂+2, if'₂Taking the values in 2 and 3, then i₂＝i′₂+ 8; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝2i′₂If i'₂Taking the values in 2 and 3, then i₂＝2i′₂+4。

When the number of the current antenna ports is 8 and the RI value is 4, the number of bits used by the compressed codeword index reported by the terminal is 2, and the mapping relationship between the compressed codeword index and the original codeword index may be as follows:

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝i′₂If i'₂Taking the values in 2 and 3, then i₂＝i′₂+ 2; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝i′₂+2, if'₂Taking the values in 2 and 3, then i₂＝i′₂+4。

Note that, the compressed codeword index i 'described above'₂And the original code word index i₂The expression of the mapping relationship is not exclusive, and any other expression capable of representing the same mapping relationship is within the scope of the present invention.

In the invention, an original code word index in the mapping relation is an original index PMI1 corresponding to a precoding matrix W1, and a compressed code word index in the mapping relation is a compressed code word index corresponding to PMI 1; or the original codeword index in the mapping relationship is the original index PMI2 corresponding to the precoding matrix W2, and the compressed codeword index in the mapping relationship is the compressed codeword index corresponding to the PMI 2.

Referring to fig. 2, a precoding processing method provided in the embodiment of the present invention includes the following steps:

step 20; a base station receives a compressed code word index reported by a terminal;

step 21; the base station determines an original code word index corresponding to the received compressed code word index according to a preset mapping relation between the compressed code word index and the original code word index;

step 22; the base station determines a precoding matrix corresponding to the original code word index by searching a precoding matrix index table corresponding to the current antenna port number and the RI value reported by the terminal;

step 23; and the base station performs precoding processing on downlink transmission data by using the precoding matrix.

In the method, the mapping relationship between the compressed codeword index and the original codeword index may use the above listed mapping relationship.

The present invention is described in detail below:

in the aperiodic PUSCH feedback mode 3-2, feedback of wideband PMI1 and subband PMI2 is required, wherein only one PMI1 needs to be fed back, and a plurality of PMIs 2 need to be fed back according to different system bandwidths, so that the number of bits required for compressing subband PMI feedback can save much overhead.

Based on the above considerations, we propose several compression methods for subband PMI feedback to save feedback overhead, i.e. not compressing the PMI1 value i₁Overhead of, only compress PMI2 values i₂The overhead of (a). The UE and the base station can perform precoding according to any one of PMI1 and PMI2 and codebook index i₁And i₂The definition of the relation determines the PMI1 value and PMI2 value.

PMI1 and wideband PMI2 with codebook index i₁And i₂Definition of the relationship of (1):

for 8 antenna ports and corresponding RI value of 1, PMI1 value i₁E { (0, 1, L, 15} corresponds to codebook index i in Table 3₁：

PMI2 feeds back the overhead 3bit compression scheme:

PMI2 value i₂E {0, 1, 2, L, 7} corresponds to codebook index i in Table 3₂；

PMI2 value i₂E {0, 1, 2, L, 7} corresponds to codebook index i in Table 3₂+4；

PMI2 value i₂E {0, 1, 2, L, 7} corresponds to the codebook index in Table 3i₂+8；

PMI2 value i₂E {0, 1, 2, L, 7} corresponds to codebook index 2i in Table 3₂；

PMI2 value i₂E {0, 1, 2, L, 7} and codebook index i in Table 3₂The corresponding relation is as follows: if PMI2 value i₂E { (0, 1, 2, 3}, which corresponds to codebook index i in Table 3₂(ii) a If PMI2 value i₂E {4, 5, 6, 7}, then corresponds to codebook index i in Table 3₂+4；

PMI2 value i₂E {0, 1, 2, L, 7} and codebook index i in Table 3₂The corresponding relation is as follows: if PMI2 value i₂E { (0, 1, 2, 3}, which corresponds to codebook index i in Table 3₂(ii) a If PMI2 value i₂E {4, 5, 6, 7}, then corresponds to codebook index i in Table 3₂+8；

PMI2 value i₂E {0, 1, 2, L, 7} and codebook index i in Table 3₂The corresponding relation is as follows: if PMI2 value i₂E { (0, 1, 2, 3}, which corresponds to codebook index i in Table 3₂+ 4; if PMI2 value i₂E {4, 5, 6, 7}, then corresponds to codebook index i in Table 3₂+8；

PMI2 feeds back a compression scheme with overhead 2 bit:

PMI2 value i₂E { (0, 1, 2, 3} corresponds to codebook index i in Table 3₂；

PMI2 value i₂E { (0, 1, 2, 3} corresponds to codebook index i in Table 3₂+4；

PMI2 value i₂E { (0, 1, 2, 3} corresponds to codebook index i in Table 3₂+8；

PMI2 value i₂E { (0, 1, 2, 3} corresponds to codebook index i in Table 3₂+12；

PMI2 value i₂E { (0, 1, 2, 3} corresponds to codebook index 2i in Table 3₂；

PMI2Value i₂E { (0, 1, 2, 3} corresponds to codebook index 2i in Table 3₂+4；

PMI2 value i₂E { (0, 1, 2, 3} corresponds to codebook index 2i in Table 3₂+8；

PMI2 value i₂E { (0, 1, 2, 3} and codebook index i in Table 3₂The corresponding relation is as follows: if PMI2 value i₂E {0, 1}, then corresponds to codebook index 2i in Table 3₂(ii) a If PMI2 value i₂E {2, 3}, then corresponds to codebook index 2i in Table 3₂+4

PMI2 value i₂E { (0, 1, 2, 3} and codebook index i in Table 3₂The corresponding relation is as follows: if PMI2 value i₂E {0, 1}, then corresponds to codebook index 2i in Table 3₂(ii) a If PMI2 value i₂E {2, 3}, then corresponds to codebook index 2i in Table 3₂+8

PMI2 value i₂E { (0, 1, 2, 3} and codebook index i in Table 3₂The corresponding relation is as follows: if PMI2 value i₂E {0, 1}, then corresponds to codebook index 2i in Table 3₂+ 4; if PMI2 value i₂E {2, 3}, then corresponds to codebook index 2i in Table 3₂+8。

For 8 antenna ports and corresponding RI value of 2, PMI _1 value i₁E { (0, 1, L, 15} corresponds to codebook index i in Table 4₁：

PMI2 feeds back the overhead 3bit compression scheme:

PMI2 value i₂E {0, 1, 2, L, 7} corresponds to codebook index 2i in Table 4₂；

PMI2 value i₂E {0, 1, 2, L, 7} corresponds to codebook index i in Table 4₂；

PMI2 value i₂E {0, 1, 2, L, 7} corresponds to codebook index i in Table 4₂+8；

PMI2 feeds back a compression scheme with overhead 2 bit:

PMI2 value i₂E { (0, 1, 2, 3} corresponds to codebook index i in Table 4₂；

PMI2 value i₂E { (0, 1, 2, 3} corresponds to codebook index 2i in Table 4₂；

PMI2 value i₂E { (0, 1, 2, 3} corresponds to codebook index i in Table 4₂+2；

PMI2 value i₂E { (0, 1, 2, 3} corresponds to codebook index i in Table 4₂+4；

PMI2 value i₂E { (0, 1, 2, 3} and codebook index i in Table 4₂The corresponding relation is as follows: if PMI2 value i₂E {0, 1}, then corresponds to codebook index i in Table 4₂(ii) a If PMI2 value i₂E {2, 3}, then corresponds to codebook index i in Table 4₂+2；

PMI2 value i₂E { (0, 1, 2, 3} and codebook index i in Table 4₂The corresponding relation is as follows: if PMI2 value i₂E {0, 1}, then corresponds to codebook index i in Table 4₂(ii) a If PMI2 value i₂E {2, 3}, then corresponds to codebook index i in Table 4₂+6；

PMI2 value i₂E { (0, 1, 2, 3} and codebook index i in Table 4₂The corresponding relation is as follows: if PMI2 value i₂E {0, 1, 2}, then corresponds to codebook index 4i in Table 4₂(ii) a If PMI2 value i₂E {3}, then corresponds to codebook index 2i in Table 4₂+4；

PMI2 value i₂E { (0, 1, 2, 3} and codebook index i in Table 4₂The corresponding relation is as follows: if PMI2 value i₂E {0, 1}, then corresponds to codebook index i in Table 4₂+ 4; if PMI2 value i₂E {2, 3}, then corresponds to codebook index i in Table 4₂+8。

For 8 antenna ports and corresponding RI value of 3, PMI _1 value i₁E {0, 1, 2, 3} corresponds to codebook index i in Table 5₁：

PMI2 feeds back the overhead 3bit compression scheme:

PMI2 value i₂E { (0, 1, 2, L, 7} corresponds to codebook index 2i in Table 5₂-(i₂mod2) where i₂mod2 represents the remainder of i divided by 2;

PMI2 value i₂E {0, 1, 2, L, 7} corresponds to codebook index 2 (i) in Table 5₂+1)-(i₂mod2) where i₂mod2 represents the remainder of i divided by 2;

PMI2 value i₂E {0, 1, 2, L, 7} corresponds to codebook index 2i in Table 5₂；

PMI2 value i₂E {0, 1, 2, L, 7} corresponds to codebook index 2i in Table 5₂+1；

PMI2 value i₂E { (0, 1, 2, L, 7} corresponds to codebook index 2i in Table 5₂+(i₂mod2) where i₂mod2 represents the remainder of i divided by 2;

PMI2 value i₂E {0, 1, 2, L, 7} corresponds to codebook index 2i in Table 5₂+((i₂+1) mod2) in which (i)₂+1) mod2 represents the remainder of i +1 divided by 2;

PMI2 value i₂E {0, 1, 2, L, 7} corresponds to codebook index i in Table 5₂；

PMI2 value i₂E {0, 1, 2, L, 7} and codebook index i in Table 5₂The corresponding relation is as follows: if PMI2 value i₂E { (0, 1, 2, 3}, which corresponds to codebook index i in Table 4₂(ii) a If PMI2 value i₂E {4, 5, 6, 7}, corresponds to codebook index i in Table 4₂+4；

PMI2 value i₂E {0, 1, 2, L, 7} and codebook index i in Table 5₂The corresponding relation is as follows: if PMI2 value i₂E { (0, 1, 2, 3}, which corresponds to codebook index i in Table 4₂+ 4; if PMI2 value i₂E {4, 5, 6, 7}, corresponds to codebook index i in Table 4₂+8；

PMI2 value i₂E {0, 1, 2, L, 7} corresponds to codebook index i in Table 5₂+4；

PMI2 value i₂E {0, 1, 2, L, 7} corresponds to codebook index i in Table 5₂+8；

PMI2 feeds back a compression scheme with overhead 2 bit:

PMI2 value i₂E { (0, 1, 2, 3} corresponds to codebook index 4i in Table 5₂；

PMI2 value i₂E { (0, 1, 2, 3} corresponds to codebook index 4i in Table 5₂+1；

PMI2 value i₂E { (0, 1, 2, 3} corresponds to codebook index 4i in Table 5₂+2；

PMI2 value i₂E { (0, 1, 2, 3} corresponds to codebook index 4i in Table 5₂+3；

PMI2 value i₂E { (0, 1, 2, 3} corresponds to codebook index i in Table 5₂；

PMI2 value i₂E { (0, 1, 2, 3} corresponds to codebook index i in Table 5₂+4；

PMI2 value i₂E { (0, 1, 2, 3} corresponds to codebook index i in Table 5₂+8；

PMI2 value i₂E { (0, 1, 2, 3} corresponds to codebook index i in Table 5₂+12；

PMI2 value i₂E { (0, 1, 2, 3} and codebook index i in Table 5₂The corresponding relation is as follows: if PMI2 value i₂E {0, 1}, then corresponds to codebook index i in Table 4₂(ii) a If PMI2 value i₂E {2, 3}, then corresponds to codebook index i in Table 4₂+6；

PMI2 value i₂E { (0, 1, 2, 3} and codebook index i in Table 5₂The corresponding relation is as follows: if PMI2 value i₂E is e {0, 1}, thenCorresponding to codebook index i in Table 4₂+ 4; if PMI2 value i₂E {2, 3}, then corresponds to codebook index i in Table 4₂+10；

PMI2 value i₂E { (0, 1, 2, 3} and codebook index i in Table 5₂The corresponding relation is as follows: if PMI2 value i₂E {0, 1}, then corresponds to codebook index i in Table 4₂+ 2; if PMI2 value i₂E {2, 3}, then corresponds to codebook index i in Table 4₂+8；

PMI2 value i₂E { (0, 1, 2, 3} and codebook index i in Table 5₂The corresponding relation is as follows: if PMI2 value i₂E {0, 1}, then corresponds to codebook index 2i in Table 4₂(ii) a If PMI2 value i₂E {2, 3}, then corresponds to codebook index 2i in Table 4₂+4。

PMI _1 value i for 8 antenna ports and corresponding RI value of 4₁E {0, 1, 2, 3} corresponds to codebook index i in Table 6₁：

PMI2 feeds back a compression scheme with overhead 2 bit:

PMI2 value i₂E { (0, 1, 2, 3} corresponds to codebook index 2i in Table 6₂；

PMI2 value i₂E { (0, 1, 2, 3} corresponds to codebook index i in Table 6₂；

PMI2 value i₂E { (0, 1, 2, 3} and codebook index i in Table 6₂The corresponding relation is as follows: if PMI2 value i₂E {0, 1}, then corresponds to codebook index i in Table 4₂(ii) a If PMI2 value i₂E {2, 3}, then corresponds to codebook index i in Table 4₂+2；

PMI2 value i₂E { (0, 1, 2, 3} and codebook index i in Table 6₂The corresponding relation is as follows: if PMI2 value i₂E {0, 1}, then corresponds to codebook index i in Table 4₂+ 2; if PMI2 value i₂E {2, 3}, then corresponds to codebook index i in Table 4₂+4。

The following examples illustrate:

step 1: the terminal determines that the precoding matrix index table corresponding to the current antenna port number 8 and RI 1 is as the table 3 above;

step 2: terminal acquires preset compressed code word index i'₂And the original code word index i₂The mapping relationship of (1): i.e. i₂＝i′₂+4, wherein i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; the number of compressed codeword indexes contained in the mapping relation satisfies the following condition: the number of bits required to represent the precoding matrices corresponding to all the compressed codeword indexes contained in the mapping relationship is 3 (the number of precoding matrices corresponding to all the compressed codeword indexes is 8), which is less than the number of bits 4 required to represent all the corresponding original precoding matrices in the precoding matrix index table (the number of all the original precoding matrices in the precoding matrix index table is 16);

selecting precoding matrixes corresponding to the original

code word indexes

4, 5, 6, 7, 8, 9, 10 and 11 mapped by the compressed code word indexes 0, 1, 2, 3, 4, 5, 6 and 7 in the mapping relation from a precoding matrix index table 3 as currently available precoding matrixes;

and step 3: the terminal selects a precoding matrix from the current available precoding matrices according to the channel state information, determines a compressed code word index corresponding to the precoding matrix, and assumes that the compressed code word index is 2;

and 4, step 4: the terminal reports the compressed code word index 2 to the base station, and the bit number used in the report is 3;

step 5; a base station receives a compressed code word index 2 reported by a terminal;

step 6; the base station determines that the original code word index corresponding to the received compressed code word index 2 is 6 according to the preset mapping relation between the compressed code word index and the original code word index;

step 7; the base station determines a precoding matrix corresponding to an original code word index 6 by searching a precoding matrix index table 3 corresponding to the port number of the current antenna and the RI value reported by the terminal;

step 8; and the base station performs precoding processing on downlink transmission data by using the precoding matrix.

In this example, i 'is indexed by setting the compressed codeword'₂And the original code word index i₂The one-to-one mapping relation reduces the currently available precoding matrix from all precoding matrices in the precoding matrix index table to 8 precoding matrices in the all precoding matrices, namely 8 precoding matrices corresponding to the

original codeword indexes

4, 5, 6, 7, 8, 9, 10 and 11, so that the terminal can use 3 bits to report the PMI, and resources occupied by reporting the PMI are saved.

Referring to fig. 3, an embodiment of the present invention further provides a wireless communication system, where the system includes:

the terminal 30 is configured to determine a precoding matrix index table corresponding to the current antenna port number and the RI value; acquiring a preset mapping relation between a compressed code word index and an original code word index, and selecting a pre-coding matrix corresponding to the original code word index mapped by the compressed code word index from the pre-coding matrix index table as a currently available pre-coding matrix; the number of compressed codeword indexes contained in the mapping relation satisfies the following conditions: the bit number required for representing the precoding matrix corresponding to all the compressed code word indexes contained in the mapping relation is less than the bit number required for representing all the corresponding original precoding matrixes in the precoding matrix index table; selecting a precoding matrix from the current available precoding matrices according to the channel state information, and determining a compressed codeword index corresponding to the precoding matrix; reporting the compressed code word index to a base station, wherein the reported bit number is not more than the bit number required by a precoding matrix corresponding to all the compressed code word indexes contained in the mapping relation;

the base station 31 is configured to receive a compressed codeword index reported by a terminal; determining an original code word index corresponding to the received compressed code word index according to a preset mapping relation between the compressed code word index and the original code word index; determining a precoding matrix corresponding to the original code word index by searching a precoding matrix index table corresponding to the current antenna port number and the reported RI value; and precoding downlink transmission data by using the precoding matrix.

Referring to fig. 4, an embodiment of the present invention further provides a precoding matrix index reporting device, where the device includes:

an index table determining unit 40, configured to determine a precoding matrix index table corresponding to the current antenna port number and the RI value;

an available matrix selecting unit 41, configured to obtain a mapping relationship between a preset compressed codeword index and an original codeword index, and select a precoding matrix corresponding to the original codeword index mapped by the compressed codeword index from the precoding matrix index table as a currently available precoding matrix; the number of compressed codeword indexes contained in the mapping relation satisfies the following conditions: the bit number required for representing the pre-coding matrix corresponding to all the compressed code word indexes contained in the mapping relation is less than the bit number required for representing all the corresponding original code words in the pre-coding matrix index table;

an index determining unit 42, configured to select a precoding matrix from currently available precoding matrices according to the channel state information, and determine a compressed codeword index corresponding to the precoding matrix;

an index reporting unit 43, configured to report the compressed codeword index to a base station, where a number of bits used for reporting is not greater than a number of bits required to represent precoding matrices corresponding to all compressed codeword indexes included in the mapping relationship.

The precoding matrix index reporting device may be specifically a device such as a terminal that needs to perform PMI reporting.

Referring to fig. 5, an embodiment of the present invention further provides a precoding processing apparatus, where the apparatus includes:

an index receiving unit 50, configured to receive a compressed codeword index reported by a terminal;

an original index determining unit 51, configured to determine, according to a mapping relationship between a preset compressed codeword index and an original codeword index, an original codeword index corresponding to the received compressed codeword index;

a matrix determining unit 52, configured to determine a precoding matrix corresponding to the original codeword index by looking up a precoding matrix index table corresponding to the current antenna port number and the reported RI value;

and a precoding unit 53, configured to perform precoding processing on the downlink transmission data by using the precoding matrix.

The precoding processing apparatus may be specifically a device such as a base station that needs to perform precoding processing on a transmission signal.

The mapping relationship between the compressed codeword index and the original codeword index used by the precoding matrix index reporting device and the precoding processing device in the present invention may be the mapping relationship of the above method parts.

In summary, the beneficial effects of the embodiment of the invention include:

in the scheme provided by the embodiment of the present invention, after determining a precoding matrix index table corresponding to the current antenna port number and RI value, a terminal obtains a mapping relationship between a preset compressed codeword index and an original codeword index, and selects a precoding matrix corresponding to the original codeword index mapped by the compressed codeword index in the mapping relationship from the precoding matrix index table as a currently available precoding matrix, where the number of compressed codeword indexes included in the mapping relationship satisfies the following conditions: the bit number required for representing the precoding matrix corresponding to all the compressed code word indexes contained in the mapping relation is less than the bit number required for representing all the corresponding original precoding matrixes in the precoding matrix index table; and then, selecting a precoding matrix from the currently available precoding matrices according to the channel state information, determining a compressed code word index corresponding to the precoding matrix, and reporting the compressed code word index to the base station, wherein the number of reported used bits is not more than the number of bits required by the precoding matrix corresponding to all the compressed code word indexes contained in the mapping relation.

It can be seen that, in the present scheme, when the currently available precoding matrix is selected, instead of selecting all precoding matrices in the determined precoding matrix index table, a precoding matrix corresponding to an original codeword index in a mapping relationship between a preset compressed codeword index and the original codeword index is selected as the currently available precoding matrix; because the bit number required for representing the precoding matrix corresponding to all the compressed codeword indexes contained in the mapping relation is less than the bit number required for representing all the corresponding original precoding matrices in the precoding matrix index table, and the bit number used for reporting the compressed codeword indexes by the terminal is not more than the bit number required for representing the precoding matrix corresponding to all the compressed codeword indexes contained in the mapping relation, the bit number actually used when the terminal reports the compressed codewords is less than the bit number required for representing all the original precoding matrices in the precoding matrix index table, that is, the bit number used for reporting the PMI by the terminal in the invention is less than the bit number used when the PMI is reported in the prior art, thereby saving the resource overhead occupied by the PMI reported by the terminal.

In the scheme provided by the embodiment of the invention, a base station receives a compressed code word index reported by a terminal, and determines an original code word index corresponding to the received compressed code word index according to a preset mapping relation between the compressed code word index and the original code word index; and determining a precoding matrix corresponding to the original code word index by searching a precoding matrix index table corresponding to the current antenna port number and the RI value reported by the terminal, and performing precoding processing on downlink transmission data by using the precoding matrix.

Therefore, by adopting the scheme, the precoding matrix indicated by the terminal can still be correctly obtained under the condition that the corresponding relation between the code word index and the precoding matrix is changed, and then the precoding processing can be carried out on the downlink transmission data according to the precoding matrix.

Particularly, the invention can reduce the resource overhead occupied by the terminal reporting PMI in the PUSCH feedback mode.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A precoding matrix index reporting method is characterized in that the method comprises the following steps:

2. The method of claim 1, wherein when the current number of antenna ports is 8 and the RI value is 1:

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝i′₂，i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7; the bit number used by the compressed code word index reported by the terminal is 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝i′₂+4，i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7; the bit number used by the compressed code word index reported by the terminal is 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝i′₂+8，i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7; the bit number used by the compressed code word index reported by the terminal is 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝2i′₂，i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7; the bit number used by the compressed code word index reported by the terminal is 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0, 1, 2, 3, then i₂＝i′₂If i'₂Taking the values in 4, 5, 6 and 7, then i₂＝i′₂+ 4; the bit number used by the compressed code word index reported by the terminal is 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0, 1, 2, 3, then i₂＝i′₂If i'₂Taking the values in 4, 5, 6 and 7, then i₂＝i′₂+ 8; the bit number used by the compressed code word index reported by the terminal is 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0, 1, 2, 3, then i₂＝i′₂+4, if'₂Taking the values in 4, 5, 6 and 7, then i₂＝i′₂+ 8; and the bit number used by the compressed code word index reported by the terminal is 3.

3. The method of claim 1, wherein when the current number of antenna ports is 8 and the RI value is 1:

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝i′₂，i′₂Values in 0, 1, 2, 3; the bit number used by the compressed code word index reported by the terminal is 2; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝i′₂+4，i′₂Values in 0, 1, 2, 3; the bit number used by the compressed code word index reported by the terminal is 2; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝i′₂+8，i′₂Values in 0, 1, 2, 3; the bit number used by the compressed code word index reported by the terminal is 2; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝i′₂+12，i′₂Values in 0, 1, 2, 3; the bit number used by the compressed code word index reported by the terminal is 2; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝2i′₂，i′₂Values in 0, 1, 2, 3; the bit number used by the compressed code word index reported by the terminal is 2; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝2i′₂+4，i′₂Values in 0, 1, 2, 3; the bit number used by the compressed code word index reported by the terminal is 2; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝2i′₂+8，i′₂Values in 0, 1, 2, 3; the bit number used by the compressed code word index reported by the terminal is 2; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝2i′₂If i' 2 takes on values in 2 and 3, then i₂＝2i′₂+ 4; the bit number used by the compressed code word index reported by the terminal is 2; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝2i′₂If i'₂Taking the values in 2 and 3, then i₂＝2i′₂+ 8; the bit number used by the compressed code word index reported by the terminal is 2; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝2i′₂+4, if'₂Taking the values in 2 and 3, then i₂＝2i′₂+ 8; the terminal reports the use of the compressed code word indexThe bit number is 2.

4. The method of claim 1, wherein when the current number of antenna ports is 8 and the RI value is 2:

compress codeword indices i and'₂Original codeword index i₂The mapping relation of (1) is as follows: i.e. i₂＝i′₂，i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7; the bit number used by the compressed code word index reported by the terminal is 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝i′₂+8，i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7; and the bit number used by the compressed code word index reported by the terminal is 3.

5. The method of claim 1, wherein when the current number of antenna ports is 8 and the RI value is 2:

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝i′₂+2，i′₂Values in 0, 1, 2, 3; the terminal reports the bits used by the compressed code word indexThe number is 2; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝i′₂If i'₂Taking the values in 2 and 3, then i₂＝i′₂+ 2; the bit number used by the compressed code word index reported by the terminal is 2; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝i′₂If i'₂Taking the values in 2 and 3, then i₂＝i′₂+ 6; the bit number used by the compressed code word index reported by the terminal is 2; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝4i′₂If i'₂Taking the values in 2 and 3, then i₂＝2i′₂+ 4; the bit number used by the compressed code word index reported by the terminal is 2; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝i′₂+4, if'₂Taking the values in 2 and 3, then i₂＝i′₂+ 8; and the bit number used by the compressed code word index reported by the terminal is 2.

6. The method of claim 1, wherein when the current number of antenna ports is 8 and the RI value is 3:

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝2i′₂-(i′₂mod 2)，i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7; the bit number used by the compressed code word index reported by the terminal is 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝2(i′₂+1)-(i′₂mod 2)，i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7; the bit number used by the compressed code word index reported by the terminal is 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝2i′₂+1，i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7; the bit number used by the compressed code word index reported by the terminal is 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝2i′₂+(i′₂mod 2)，i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7; the bit number used by the compressed code word index reported by the terminal is 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝2i′₂+((i′₂+1)mod 2)， i′₂Values in 0, 1, 2, 3, 4, 5, 6, 7; the bit number used by the compressed code word index reported by the terminal is 3; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0, 1, 2, 3, then i₂＝i′₂+4, if'₂Taking the values in 4, 5, 6 and 7, then i₂＝i′₂+ 8; the bit number used by the compressed code word index reported by the terminal is 3; or,

7. The method of claim 1, wherein when the current number of antenna ports is 8 and the RI value is 3:

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝4i′₂，i′₂Values in 0, 1, 2, 3; the bit number used by the compressed code word index reported by the terminal is 2; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝4i′₂+1，i′₂Values in 0, 1, 2, 3; the bit number used by the compressed code word index reported by the terminal is 2; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝4i′₂+2，i′₂Values in 0, 1, 2, 3; the bit number used by the compressed code word index reported by the terminal is 2; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂＝4i′₂+3，i′₂Values in 0, 1, 2, 3; the bit number used by the compressed code word index reported by the terminal is 2; or,

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝i′₂+4, if'₂Taking the values in 2 and 3, then i₂＝i′₂+ 10; the bit number used by the compressed code word index reported by the terminal is 2; or

Compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝i′₂+2, if'₂Taking the values in 2 and 3, then i₂＝i′₂+ 8; the bit number used by the compressed code word index reported by the terminal is 2; or

Compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝2i′₂If i'₂Taking the values in 2 and 3, then i₂＝2i′₂+ 4; and the bit number used by the compressed code word index reported by the terminal is 2.

8. The method of claim 1, wherein when the current number of antenna ports is 8 and the RI value is 4:

compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂＝i′₂+2, if'₂Taking the values in 2 and 3, then i₂＝i′₂+ 4; and the bit number used by the compressed code word index reported by the terminal is 2.

9. The method according to any of claims 1-8, wherein the original codeword index in the mapping relationship is an original index PMI1 corresponding to a precoding matrix W1, and the compressed codeword index in the mapping relationship is a compressed codeword index corresponding to PMI 1; or,

the original codeword index in the mapping relationship is an original index PMI2 corresponding to the precoding matrix W2, and the compressed codeword index in the mapping relationship is a compressed codeword index corresponding to the PMI 2.

10. A method for precoding, the method comprising:

a base station receives a compressed code word index reported by a terminal;

the base station determines an original code word index corresponding to the received compressed code word index according to a preset mapping relation between the compressed code word index and the original code word index; when the number of the current antenna ports is 8 and the RI value is 1: compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+4，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+8，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂At 0,1. 2, 3, then i₂=i'₂If i'₂Taking the values in 4, 5, 6 and 7, then i₂=i'₂+ 4; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0, 1, 2, 3, then i₂=i'₂If i'₂Taking the values in 4, 5, 6 and 7, then i₂=i'₂+ 8; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0, 1, 2, 3, then i₂=i'₂+4, if'₂Taking the values in 4, 5, 6 and 7, then i₂=i'₂+8；

The base station determines a precoding matrix corresponding to the original code word index by searching a precoding matrix index table corresponding to the current antenna port number and the RI value reported by the terminal;

11. A method for precoding, the method comprising:

a base station receives a compressed code word index reported by a terminal;

the base station determines an original code word index corresponding to the received compressed code word index according to a preset mapping relation between the compressed code word index and the original code word index; when the number of the current antenna ports is 8 and the RI value is 1: compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+4，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+8，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+12，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂+4，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂+8，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=2i'₂If i'₂Taking the values in 2 and 3, then i₂=2i'₂+ 4; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=2i'₂If i'₂Taking the values in 2 and 3, then i₂=2i'₂+ 8; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=2i'₂+4, if'₂Taking the values in 2 and 3, then i₂=2i'₂+8；

12. A method for precoding, the method comprising:

a base station receives a compressed code word index reported by a terminal;

the base station determines an original code word index corresponding to the received compressed code word index according to a preset mapping relation between the compressed code word index and the original code word index; when the number of the current antenna ports is 8 and the RI value is 2: compressing codeword indexesi'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+8，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7;

13. A method for precoding, the method comprising:

a base station receives a compressed code word index reported by a terminal;

the base station determines an original code word index corresponding to the received compressed code word index according to a preset mapping relation between the compressed code word index and the original code word index; when the number of the current antenna ports is 8 and the RI value is 2: compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+2，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+4，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂Has a mapping relation of: if'₂Taking values in 0 and 1, then i₂=i'₂If i'₂Taking the values in 2 and 3, then i₂=i'₂+ 2; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=i'₂If i'₂Taking the values in 2 and 3, then i₂=i'₂+ 6; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=4i'₂If i'₂Taking the values in 2 and 3, then i₂=2i'₂+ 4; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=i'₂+4, if'₂Taking the values in 2 and 3, then i₂=i'₂+8；

14. A method for precoding, the method comprising:

a base station receives a compressed code word index reported by a terminal;

the base station determines an original code word index corresponding to the received compressed code word index according to a preset mapping relation between the compressed code word index and the original code word index; when the number of the current antenna ports is 8 and the RI value is 3: compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂-（i'₂imod2），i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2（i'₂+1）-（i'₂mod2），i'₂Taking values in 0, 1, 2, 3, 4, 5, 6, 7(ii) a Or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂+1，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂+（i'₂mod2），i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂+（（i'₂+1）mod2），i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0, 1, 2, 3, then i₂=i'₂If i'₂Taking the values in 4, 5, 6 and 7, then i₂=i'₂+ 4; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0, 1, 2, 3, then i₂=i'₂+4, if'₂Taking the values in 4, 5, 6 and 7, then i₂=i'₂+ 8; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+4，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+8，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7;

15. A method for precoding, the method comprising:

a base station receives a compressed code word index reported by a terminal;

the base station determines an original code word index corresponding to the received compressed code word index according to a preset mapping relation between the compressed code word index and the original code word index; when the number of the current antenna ports is 8 and the RI value is 3: compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=4i'₂，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=4i'₂+1，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=4i'₂+2，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=4i'₂+3，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+4，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+8，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+12，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂The value of 0 and the value of 1,then i₂=i'₂If i'₂Taking the values in 2 and 3, then i₂=i'₂+ 6; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=i'₂+4, if'₂Taking the values in 2 and 3, then i₂=i'₂+ 10; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=i'₂+2, if'₂Taking the values in 2 and 3, then i₂=i'₂+ 8; the bit number used by the compressed code word index reported by the terminal is 2; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=2i'₂If i'₂Taking the values in 2 and 3, then i₂=2i'₂+ 4; the bit number used by the compressed code word index reported by the terminal is 2;

16. A method for precoding, the method comprising:

a base station receives a compressed code word index reported by a terminal;

the base station determines an original code word index corresponding to the received compressed code word index according to a preset mapping relation between the compressed code word index and the original code word index; when the current number of antenna ports is 8 and the RI value is 4: compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂，i'₂Values in 0, 1, 2, 3; orAnd, compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=i'₂If i'₂Taking the values in 2 and 3, then i₂=i'₂+ 2; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=i'₂+2, if'₂Taking the values in 2 and 3, then i₂=i'₂+4；

17. A precoding matrix index reporting device, comprising:

18. A precoding processing apparatus, comprising:

the original index determining unit is used for determining an original code word index corresponding to the received compressed code word index according to the preset mapping relation between the compressed code word index and the original code word index; when the number of the current antenna ports is 8 and the RI value is 1: compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+4，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+8，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0, 1, 2, 3, then i₂=i'₂If i'₂Taking the values in 4, 5, 6 and 7, then i₂=i'₂+ 4; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0, 1, 2, 3, then i₂=i'₂If i'₂Taking the values in 4, 5, 6 and 7, then i₂=i'₂+ 8; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0, 1, 2, 3, then i₂=i'₂+4, if'₂Taking values in 4, 5, 6, 7Then i is₂=i'₂+8；

A matrix determining unit, configured to determine a precoding matrix corresponding to the original codeword index by searching for a precoding matrix index table corresponding to the current antenna port number and the reported RI value;

19. A precoding processing apparatus, comprising:

the original index determining unit is used for determining an original code word index corresponding to the received compressed code word index according to the preset mapping relation between the compressed code word index and the original code word index; when the number of the current antenna ports is 8 and the RI value is 1: compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+4，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+8，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+12，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂+4，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂+8，i'₂In 0, 1, 2, 3Taking values; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=2i'₂If i'₂Taking the values in 2 and 3, then i₂=2i'₂+ 4; or, code word index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=2i'₂If i'₂Taking the values in 2 and 3, then i₂=2i'₂+ 8; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=2i'₂+4, if'₂Taking the values in 2 and 3, then i₂=2i'₂+8；

20. A precoding processing apparatus, comprising:

the original index determining unit is used for determining an original code word index corresponding to the received compressed code word index according to the preset mapping relation between the compressed code word index and the original code word index; when the number of the current antenna ports is 8 and the RI value is 2: compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+8，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7;

21. A precoding processing apparatus, comprising:

the original index determining unit is used for determining an original code word index corresponding to the received compressed code word index according to the preset mapping relation between the compressed code word index and the original code word index; when the number of the current antenna ports is 8 and the RI value is 2: compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+2，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂Index i with original code word₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+4，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=i'₂If i'₂Taking the values in 2 and 3, then i₂=i'₂+ 2; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=i'₂If i'₂Taking the values in 2 and 3, then i₂=i'₂+ 6; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=4i'₂If i'₂Taking the values in 2 and 3, then i₂=2i'₂+ 4; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=i'₂+4, if'₂Taking the values in 2 and 3, then i₂=i'₂+8；

22. A precoding processing apparatus, comprising:

the original index determining unit is used for determining an original code word index corresponding to the received compressed code word index according to the preset mapping relation between the compressed code word index and the original code word index; when the number of the current antenna ports is 8 and the RI value is 3: compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂-（i'₂imod2），i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2（i'₂+1）-（i'₂mod2），i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂+1，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂+（i'₂mod2），i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂+（（i'₂+1）mod2），i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0, 1, 2, 3, then i₂=i'₂If i'₂Taking the values in 4, 5, 6 and 7, then i₂=i'₂+ 4; or, code word index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0, 1, 2, 3, then i₂=i'₂+4, if'₂Taking the values in 4, 5, 6 and 7, then i₂=i'₂+ 8; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+4，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+8，i'₂Values in 0, 1, 2, 3, 4, 5, 6, 7;

23. A precoding processing apparatus, comprising:

the original index determining unit is used for determining an original code word index corresponding to the received compressed code word index according to the preset mapping relation between the compressed code word index and the original code word index; when the number of the current antenna ports is 8 and the RI value is 3: compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=4i'₂，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=4i'₂+1，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=4i'₂+2，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=4i'₂+3，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+4，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+8，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂+12，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=i'₂If i'₂Taking the values in 2 and 3, then i₂=i'₂+ 6; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=i'₂+4, if'₂Taking the values in 2 and 3, then i₂=i'₂+ 10; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=i'₂+2, if'₂Taking the values in 2 and 3, then i₂=i'₂+ 8; the bit number used by the compressed code word index reported by the terminal is 2; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=2i'₂If i'₂Taking the values in 2 and 3, then i₂=2i'₂+ 4; the bit number used by the compressed code word index reported by the terminal is 2;

24. A precoding processing apparatus, comprising:

the original index determining unit is used for determining an original code word index corresponding to the received compressed code word index according to the preset mapping relation between the compressed code word index and the original code word index; when the current number of antenna ports is 8 and the RI value is 4: compress codeword index i'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=2i'₂，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: i.e. i₂=i'₂，i'₂Values in 0, 1, 2, 3; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=i'₂If i'₂Taking the values in 2 and 3, then i₂=i'₂+ 2; or, the codeword index i 'is compressed'₂And the original code word index i₂The mapping relation of (1) is as follows: if'₂Taking values in 0 and 1, then i₂=i'₂+2, if'₂Taking the values in 2 and 3, then i₂=i'₂+4；

25. A wireless communication system, comprising:

the terminal is used for determining a precoding matrix index table corresponding to the current antenna port number and the rank RI value; acquiring a preset mapping relation between a compressed code word index and an original code word index, and selecting a pre-coding matrix corresponding to the original code word index mapped by the compressed code word index from the pre-coding matrix index table as a currently available pre-coding matrix; the number of compressed codeword indexes contained in the mapping relation satisfies the following conditions: the bit number required for representing the precoding matrix corresponding to all the compressed code word indexes contained in the mapping relation is less than the bit number required for representing all the corresponding original precoding matrixes in the precoding matrix index table; selecting a precoding matrix from the current available precoding matrices according to the channel state information, and determining a compressed code word index corresponding to the precoding matrix; reporting the compressed code word index to a base station, wherein the reported bit number is not more than the bit number required by a precoding matrix corresponding to all the compressed code word indexes contained in the mapping relation;