CN115843053B - Method and device for calculating TPMI and RI based on SRS signals of 5G small base station - Google Patents
Method and device for calculating TPMI and RI based on SRS signals of 5G small base station Download PDFInfo
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Abstract
The invention relates to a method and a device for calculating TPMI and RI based on SRS signals of a 5G small base station, which comprises the steps of judging whether a currently received uplink SRS measurement signal is in a single-layer single-port transmission mode, if so, transmitting TPMI to be 0 and RI to be 1; if not, calculating signal-to-noise ratio SNR or channel capacity C corresponding to each of the two transmission modes of the single-layer two-port and the two-layer two-port, judging from which transmission mode the maximum value of the signal-to-noise ratio SNR or the channel capacity C comes, if from the single-layer two-port transmission mode, transmitting the RI as 1, the SNR of the maximum value of the TPMI or the TPMI mapped by the precoding matrix W corresponding to the C, and if from the two-layer two-port transmission mode, transmitting the RI as 2, the TPMI as the SNR of the maximum value or the TPMI mapped by the precoding matrix W corresponding to the C. The invention can obtain the TPMI and the RI through simple calculation steps according to the final signal-to-noise ratio, the final channel estimation and the precoding matrix specified by the 3GPP protocol, does not need the UE to send the TPMI and the RI, and improves the throughput and the transmission performance of the system.
Description
Technical Field
The invention relates to the technical field of mobile communication, in particular to a method and a device for calculating TPMI and RI based on SRS signals of a 5G small base station.
Background
The sounding reference signal SRS (Sounding Reference Signal) is a signal for detecting the quality of an uplink channel. When there are multiple transmitting channels, the UE may transmit uplink signals through multiple antenna techniques, so as to obtain multiple antenna processing gains. The multi-antenna technology of the NR uplink PUSCH of the 5G system comprises two schemes of codebook-based transmission and non-codebook transmission.
The basic transmission flow based on the codebook is as follows: the UE transmits SRS to the base station; the base station measures SRS sent by UE, performs resource scheduling on the UE, and informs the UE of resource allocation of PUSCH, corresponding precoding matrix index (TPMI)/Rank Index (RI) port indication information and the like; and the UE carries out modulation coding on the data according to the MCS indicated by the base station, determines a precoding matrix and a transmission layer number used during data transmission by utilizing the TPMI and the RI, and further carries out precoding transmission on the data.
The transmission basic flow based on the non-codebook is as follows: the UE measures a downlink reference signal, obtains candidate uplink precoding vectors for the estimated channels, respectively precodes SRS by using the obtained precoding vectors, and then transmits the SRS to the base station; the base station measures SRS sent by UE, performs resource scheduling on the UE, and informs the UE of resource allocation of PUSCH, corresponding precoding matrix index (TPMI)/Rank Index (RI) port indication information and the like; and the UE carries out modulation coding on the data according to the MCS sent by the base station, determines the precoding and the transmission layer number of the data by utilizing the SRI, and sends the data after precoding.
It can be seen that, whether the transmission scheme is based on the codebook or the non-codebook, the base station is required to measure the SRS signal and indicate information such as the precoding matrix index TPMI/rank index RI to the UE. However, the prior art has the problems that: for the 5G small cell equipment, the UE is required to transmit The Precoding Matrix Index (TPMI) and the anecdotal index (RI) to the base station, the 5G small cell equipment cannot measure the values of the TPMI and the RI, and the system resources are required to be occupied based on the mode of feeding back the TPMI and the RI by the UE, so that the system throughput is small and the transmission performance is low.
Therefore, it is needed to propose a method and apparatus for enabling a 5G small cell device to obtain TPMI and RI itself, so as to improve the transmission performance and throughput of the system.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method and a device for calculating TPMI and RI based on SRS signals of a 5G small base station so as to improve the uplink transmission performance of a system.
In order to solve the technical problems, the invention provides a method for calculating TPMI and RI based on SRS signals of a 5G small base station, which comprises the following steps:
s1, judging whether a currently received uplink SRS measurement signal is in a single-layer single-port transmission mode, if so, transmitting a precoding matrix index (TPMI) as 0 and a Rank Index (RI) as 1; if not, extracting a receiving signal Y from the received uplink SRS measurement signal 1 And Y is equal to 2 And transmitting a signal S 1 And S is equal to 2 Step S2 is carried out again; wherein Y is 1 For the received signal of the first port, Y 2 Is the second oneA received signal at the port; s is S 1 For transmitting signals of the first antenna S 2 Is the transmitted signal of the second antenna;
s2, calculating signal-to-noise ratio SNR or channel capacity C of each of two transmission modes according to a single-layer two-port precoding matrix W and a two-layer two-port precoding matrix W respectively corresponding to the two transmission modes specified by a 3GPP protocol;
s3, judging which transmission mode the maximum value of the signal-to-noise ratio SNR or the channel capacity C of the two transmission modes comes from, if the transmission mode comes from a single-layer two-port transmission mode, transmitting a rank index RI as 1, wherein The Precoding Matrix Index (TPMI) is the maximum value SNR or the TPMI mapped by the precoding matrix W corresponding to the C, and if the transmission mode comes from the two-layer two-port transmission mode, transmitting the rank index RI as 2, wherein The Precoding Matrix Index (TPMI) is the maximum value SNR or the TPMI mapped by the precoding matrix W corresponding to the C.
Further, the signal to noise ratio of the single layer two port transmission mode
First layer signal to noise ratio in two layer two port transmission mode>
Second layer signal to noise ratio
Wherein H is 11 H for channel estimation response between the first receiving port and the first transmitting port 12 H for channel estimation response between the first receiving port and the second transmitting port 21 H for channel estimation response between the second receiving port and the first transmitting port 22 Estimating a response for a channel between the second receive port and the second transmit port; n (N) 0 Is gaussian white noise.
Further, the single layer two port transmission mode has channel capacity
Channel capacity of said two-layer two-port transmission mode +.>
Wherein H is 11 H for channel estimation response between the first receiving port and the first transmitting port 12 H for channel estimation response between the first receiving port and the second transmitting port 21 H for channel estimation response between the second receiving port and the first transmitting port 22 Estimating a response for a channel between the second receive port and the second transmit port; n (N) 0 Is gaussian white noise.
Further, the single-layer two-port mode includes 6 precoding matrices, which are respectively:
mapped TMPI 0 ＝0；/>
Mapped TMPI 1 ＝1；/>
Mapped TMPI 2 ＝2；/>
Mapped TMPI 3 ＝3；/>
Mapped TMPI 4 ＝4；/>
Mapped TMPI 5 =5; where j is a complex number.
Further, the two-layer two-port mode includes 3 precoding matrices, which are respectively:
In order to solve the technical problems, the invention also provides a device for calculating the TPMI and the RI based on the SRS signal of the 5G small base station, which comprises a judging unit, a signal extracting unit, a calculating unit and a TPMI/RI unit;
the judging unit is used for judging whether the uplink SRS measurement signal received currently is in a single-layer single-port transmission mode or not; if yes, a precoding matrix index (TPMI) is sent to be 0, and a Rank Index (RI) is sent to be 1; if not, starting the signal extraction unit;
the signal extraction unit is configured to extract a received signal Y from the received uplink SRS measurement signal when the determination unit determines that the currently received uplink SRS measurement signal is not in the single-layer single-port transmission mode 1 And Y 2 And transmitting a signal S 1 And S is 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein Y is 1 For the received signal of the first port, Y 2 A received signal for the second port; s is S 1 For transmitting signals of the first antenna S 2 Is the transmitted signal of the second antenna;
the calculating unit is used for calculating the signal-to-noise ratio SNR or channel capacity C of each of the two transmission modes according to a single-layer two-port precoding matrix W and a two-layer two-port precoding matrix W respectively corresponding to the two transmission modes specified by the 3GPP protocol;
the TPMI/RI unit is configured to determine which transmission mode the maximum value of the signal-to-noise ratio SNR or the channel capacity C of the two transmission modes comes from, if the transmission mode comes from a single-layer two-port transmission mode, send a rank index RI of 1, a precoding matrix index TPMI of the SNR of the maximum value or a TPMI mapped by a precoding matrix W corresponding to C, and if the transmission mode comes from a two-layer two-port transmission mode, send a rank index RI of 2, and a precoding matrix index TPMI of the SNR of the maximum value or a TPMI mapped by a precoding matrix W corresponding to C.
Further, the signal to noise ratio of the single layer two port transmission mode
First layer signal to noise ratio in two layer two port transmission mode>
Second layer signal to noise ratio
Wherein H is 11 H for channel estimation response between the first receiving port and the first transmitting port 12 H for channel estimation response between the first receiving port and the second transmitting port 21 H for channel estimation response between the second receiving port and the first transmitting port 22 Estimating a response for a channel between the second receive port and the second transmit port; n (N) 0 Is gaussian white noise.
Further, the single layer two port transmission mode has channel capacity
Channel capacity of said two-layer two-port transmission mode +.>
Wherein H is 11 H for channel estimation response between the first receiving port and the first transmitting port 12 H for channel estimation response between the first receiving port and the second transmitting port 21 H for channel estimation response between the second receiving port and the first transmitting port 22 Estimating a response for a channel between the second receive port and the second transmit port; n (N) 0 Is gaussian white noise.
Further, the single-layer two-port mode includes 6 precoding matrices, which are respectively:
mapped TMPI 0 ＝0；/>
Mapped TMPI 1 ＝1；/>
Mapped TMPI 2 ＝2；/>
Mapped TMPI 3 ＝3；/>
Mapped TMPI 4 ＝4；
Further, the two-layer two-port mode includes 3 precoding matrices, which are respectively:
mapped TMPI 0 ＝0；/>
Mapped TMPI 1 ＝1；/>
Mapped TMPI 2 ＝2。
Compared with the prior art, the invention has the following beneficial effects: the invention can obtain the TPMI and the RI according to the uplink SRS measurement signals received by the 5G small base station equipment through simple calculation steps, does not need UE to send the TPMI and the RI, and improves the uplink transmission performance of the system.
Drawings
Fig. 1 is a step diagram of a method for calculating TPMI and RI based on SRS signals of a 5G small cell according to an embodiment of the present invention;
fig. 2 is a block diagram of an apparatus for calculating TPMI and RI based on SRS signals of a 5G small cell according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
It should be noted that the terms "first," "second," and the like in the description and in the claims of the present application are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged where appropriate to implement in other sequences than those of the embodiments of the invention.
As shown in fig. 1, the method for calculating TPMI and RI based on SRS signals of a 5G small cell according to the embodiment of the present invention includes the following steps:
s1, judging whether a currently received uplink SRS measurement signal is in a single-layer single-port transmission mode, if so, setting a precoding matrix index (TPMI) as 0 and setting a Rank Index (RI) as 1; if not, extracting a receiving signal Y from the received uplink SRS measurement signal 1 And Y is equal to 2 And transmitting a signal S 1 And S is equal to 2 Step S2 is performed again.
Wherein Y is 1 For the received signal of the first port, Y 2 A received signal for the second port; s is S 1 For transmitting signals of the first antenna S 2 Is the transmitted signal of the second antenna;
s2, calculating signal-to-noise ratio SNR or channel capacity C of each of the two transmission modes according to a single-layer two-port precoding matrix W and a two-layer two-port precoding matrix W respectively corresponding to the two transmission modes specified by the 3GPP protocol.
Specifically, in the two-layer two-port transmission mode, the transmission signal is
The precoding matrix is W, the channel estimation response is H, the subscript of H represents the receiving port and the transmitting port respectively, and the received signal is +.>
The two-layer two-port transmission model is as follows:
the transmission signal S of the first antenna 1 Channel capacity C of (2) 1 ＝lg(1+(Ys 1 ) 2 /((Is 1 ) 2 +N 0 ) Transmit signal S of the second antenna 2 Channel capacity C of (2) 2 ＝lg(1+(Ys 2 ) 2 /((Is 2 ) 2 +N 0 ))。
Wherein the useful signal of the first receiving antenna
Interference signal Is of first receiving antenna 1 ＝(H 11 W 21 +H 21 W 22 )S 1 Useful signal of the second receiving antenna +.>
Interference signal Is of second receiving antenna 2 ＝(H 12 W 11 +H 22 W 22 )S 2 。
Channel capacity c=c of two layers and two ports 1 +C 2 ＝lg(1+(H 11 W 11 +H 21 W 12 ) 2 /((H 11 W 21 +H 21 W 22 ) 2 +N 0 ))+lg(1+(H 12 W 21 +H 22 W 22 ) 2 /((H 12 W 11 +H 22 W 12 ) 2 +N 0 ))＝。
Wherein H is 11 H for channel estimation response between the first receiving port and the first transmitting port 12 H for channel estimation response between the first receiving port and the second transmitting port 21 H for channel estimation response between the second receiving port and the first transmitting port 22 Estimating a response for a channel between the second receive port and the second transmit port; w (W) 11 For the precoding matrix between the first receiving port and the first transmitting port, W 12 For the precoding matrix between the first receiving port and the second transmitting port, W 21 For the precoding matrix between the second receiving port and the first transmitting port, W 22 Is a precoding matrix between the second receive port and the second transmit port. N (N) 0 Is gaussian white noise. W (W) 11 ＝W 12 ＝W 21 ＝W 22 ＝W。
Specifically, in the single-layer two-port transmission mode, the transmission signal is S 1 The precoding matrix is W, the channel estimation response is H, the subscript of H indicates the receiving port and the transmitting port respectively, and the received signal is
The single layer two port transmission model is:
channel capacity
Since the channel capacity C is proportional to the signal-to-noise ratio SNR, the signal-to-noise ratio SNR can be used as a final judgment criterion for simplifying the calculation. Specifically, the first layer signal to noise ratio of the two-layer two-port transmission mode
Second layer signal to noise ratio->
Signal to noise ratio for single layer two port transmission mode
S3, judging which transmission mode the maximum value of the signal-to-noise ratio SNR or the channel capacity C of the two transmission modes comes from, if the transmission mode comes from a single-layer two-port transmission mode, sending a rank index RI of 1, wherein The Precoding Matrix Index (TPMI) is the maximum value SNR or the TPMI mapped by the precoding matrix W corresponding to the C, and if the transmission mode comes from the two-layer two-port transmission mode, sending the rank index RI of 2, and The Precoding Matrix Index (TPMI) is the maximum value SNR or the TPMI mapped by the precoding matrix W corresponding to the C.
In the single layer two port mode, there are 6 precoding matrices W, as shown in Table 1, respectively
Mapped TMPI 0 ＝0；/>
Mapped TMPI 1 ＝1；
Thus, in a single layerIn the two-port mode, 6 signal-to-noise ratio SNR's can be obtained, respectively SNR 0 -SNR 5 And 6 channel capacities C, respectively C 0 -C 5。
TABLE 1
In the two-layer two-port mode, there are 3 precoding matrices W, and as shown in table 2, the precoding matrices W are:
TABLE 2
The final TPMI and RI are determined by judging to which transmission mode the maximum value of all signal-to-noise ratio SNR or the maximum value of all channel capacity C belongs. It is assumed that the maximum value of SNR or C is from a single layer of two ports and is based on SNR 3 Or C 3 Calculated, RI is 1, and mapped TPMI is TPMI 3 ＝3。
As shown in fig. 2, the apparatus for calculating TPMI and RI based on SRS signals of 5G small cell in the embodiment of the present invention includes a determining unit, a signal extracting unit, a calculating unit and a TPMI/RI unit.
The judging unit is used for judging whether the uplink SRS measurement signal received currently is in a single-layer single-port transmission mode or not; if so, a precoding matrix index TPMI is sent as 0 and a rank index RI is 1.
A signal extraction unit, configured to extract a received signal Y from the received uplink SRS measurement signal when the determination unit determines that the currently received uplink SRS measurement signal is not in the single-layer single-port transmission mode 1 And Y 2 And transmitting a signal S 1 And S is 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein Y is 1 For the received signal of the first port, Y 2 A received signal for the second port; s is S 1 For transmitting signals of the first antenna S 2 Is the transmit signal of the second antenna.
And the calculating unit is used for calculating the signal-to-noise ratio SNR or channel capacity C of each of the two transmission modes according to the precoding matrixes W corresponding to the single-layer two-port transmission mode and the two-layer two-port transmission mode specified by the 3GPP protocol.
Specifically, the signal-to-noise ratio of the single layer two port transmission mode
Channel capacity for single layer two port transmission mode
Channel capacity of two-layer two-port transmission mode>
Wherein H is 11 H for channel estimation response between the first receiving port and the first transmitting port 12 H for channel estimation response between the first receiving port and the second transmitting port 21 H for channel estimation response between the second receiving port and the first transmitting port 22 Estimating a response for a channel between the second receive port and the second transmit port; n (N) 0 Is gaussian white noise.
And the TPMI/RI unit is configured to determine which transmission mode the maximum value of the signal-to-noise ratio SNR or the channel capacity C of each of the two transmission modes comes from, if the transmission mode comes from the single-layer two-port transmission mode, send a rank index RI of 1, a precoding matrix index TPMI of the maximum value SNR or the TPMI mapped by the precoding matrix W corresponding to C, and if the transmission mode comes from the two-layer two-port transmission mode, send a rank index RI of 2, and the precoding matrix index TPMI of the maximum value SNR or the TPMI mapped by the precoding matrix W corresponding to C.
As shown in table 1, in the single-layer two-port mode, there are 6 precoding matrices W, as shown in table 1, respectively
Mapped TMPI 0 ＝0；/>
Mapped TMPI 1 ＝1；/>
Mapped TMPI 2 ＝2；/>
Mapped TMPI 3 ＝3；/>
Mapped TMPI 4 ＝4；/>
Mapped TMPI 5 =5; where j is a complex number.
Thus, in the single layer two port mode, 6 signal-to-noise ratio SNRs, each SNR, can be obtained 0 -SNR 5 And 6 channel capacities C, respectively C 0 -C 5。
As shown in table 2, in the two-layer two-port mode, 3 precoding matrices W are provided, and as shown in table 2, the precoding matrices W are:
mapped TMPI 0 ＝0；/>
Mapped TMPI 1 ＝1；/>
Mapped TMPI 2 =2; where j is a complex number. Since W is a 2×2 matrix, three pairs of first layer SNR can be calculated 1 And a second layer signal to noise ratio SNR 2 And three pairs of channel capacities C 0 -C 2。
And determining final TPMI and RI by judging to which transmission mode the maximum value of all signal-to-noise ratio SNR or the maximum value of all channel capacity C belongs. It is assumed that the maximum value of SNR or C is from a single layer of two ports and is based on SNR 3 Or C 3 Calculated, RI is 1, and mapped TPMI is TPMI 3 ＝3。
In summary, the present invention can obtain TPMI and RI according to the uplink SRS measurement signal received by the 5G small cell device and through a simple calculation step, without the need for the UE to send the TPMI and RI, thereby improving the uplink transmission performance of the system.
The foregoing examples only illustrate preferred embodiments of the invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that modifications and improvements can be made without departing from the spirit of the invention, such as combining different features of the various embodiments, which are all within the scope of the invention.
Claims (10)
1. A method for calculating TPMI and RI based on SRS signals of a 5G small cell, comprising the steps of:
s1, judging whether a currently received uplink SRS measurement signal is in a single-layer single-port transmission mode, if so, transmitting a precoding matrix index (TPMI) as 0 and a Rank Index (RI) as 1; if not, extracting received signals Y1 and Y2 and transmitted signals S1 and S2 from the received uplink SRS measurement signals, and then entering step S2; wherein Y1 is a received signal of the first port, and Y2 is a received signal of the second port; s1 is a transmitting signal of a first antenna, S2 is a transmitting signal of a second antenna;
s2, calculating signal-to-noise ratio SNR or channel capacity C of each of the two transmission modes according to the precoding matrixes W corresponding to the two transmission modes of the single-layer two ports and the two layers two ports;
s3, judging which transmission mode the maximum value of the signal-to-noise ratio SNR or the channel capacity C of the two transmission modes comes from, if the transmission mode comes from a single-layer two-port transmission mode, transmitting a rank index RI as 1, wherein The Precoding Matrix Index (TPMI) is the maximum value SNR or the TPMI mapped by the precoding matrix W corresponding to the C, and if the transmission mode comes from the two-layer two-port transmission mode, transmitting the rank index RI as 2, wherein The Precoding Matrix Index (TPMI) is the maximum value SNR or the TPMI mapped by the precoding matrix W corresponding to the C.
2. The method for calculating TPMI and RI based on SRS signals of a 5G small cell according to claim 1, wherein the signal-to-noise ratio of the single layer two port transmission mode
First layer signal to noise ratio in two layer two port transmission mode>
Second layer signal to noise ratio
Wherein H11 is channel estimation response between the first receiving port and the first transmitting portIn addition, H12 is a channel estimation response between the first receiving port and the second transmitting port, H21 is a channel estimation response between the second receiving port and the first transmitting port, and H22 is a channel estimation response between the second receiving port and the second transmitting port; n0 is gaussian white noise.
3. The method for calculating TPMI and RI based on SRS signals of a 5G small cell according to claim 1, wherein channel capacity of the single layer two port transmission mode
Channel capacity of the two-layer two-port transmission mode
Wherein, H11 is a channel estimation response between the first receiving port and the first transmitting port, H12 is a channel estimation response between the first receiving port and the second transmitting port, H21 is a channel estimation response between the second receiving port and the first transmitting port, and H22 is a channel estimation response between the second receiving port and the second transmitting port; n0 is gaussian white noise.
4. The method for calculating TPMI and RI based on SRS signals of a 5G small cell according to claim 1, wherein the single layer two port mode includes 6 precoding matrices, respectively:
mapped tmpi0=0;
mapped tmpi1=1; />
Mapped tmpi2=2; />
Mapped tmpi3=3; />
Mapped tmpi4=4; />
Mapped tmpi5=5; where j is a complex number.
5. The method for calculating TPMI and RI based on SRS signals of a 5G small cell according to claim 1, wherein the two-layer two-port pattern includes 3 precoding matrices, respectively:
mapped tmpi0=0;
mapped tmpi1=1; />
Impi2=2 mapped.
6. The device for calculating the TPMI and the RI based on the SRS signals of the 5G small base station is characterized by comprising a judging unit, a signal extracting unit, a calculating unit and a TPMI/RI unit;
the judging unit is used for judging whether the uplink SRS measurement signal received currently is in a single-layer single-port transmission mode or not; if yes, a precoding matrix index (TPMI) is sent to be 0, and a Rank Index (RI) is sent to be 1;
the signal extraction unit is configured to extract, when the judgment unit judges that the currently received uplink SRS measurement signal is not in the single-layer single-port transmission mode, reception signals Y1 and Y2 and transmission signals S1 and S2 from the received uplink SRS measurement signal; wherein Y1 is a received signal of the first port, and Y2 is a received signal of the second port; s1 is a transmitting signal of a first antenna, S2 is a transmitting signal of a second antenna;
the computing unit is used for computing the signal-to-noise ratio SNR or channel capacity C of each of the two transmission modes according to the precoding matrixes W corresponding to the two transmission modes of the single-layer two ports and the two layers two ports respectively;
the TPMI/RI unit is configured to determine which transmission mode the maximum value of the signal-to-noise ratio SNR or the channel capacity C of the two transmission modes comes from, if the transmission mode comes from a single-layer two-port transmission mode, send a rank index RI of 1, a precoding matrix index TPMI of the SNR of the maximum value or a TPMI mapped by a precoding matrix W corresponding to C, and if the transmission mode comes from a two-layer two-port transmission mode, send a rank index RI of 2, and a precoding matrix index TPMI of the SNR of the maximum value or a TPMI mapped by a precoding matrix W corresponding to C.
7. The apparatus for calculating TPMI and RI based on SRS signals of 5G small cell according to claim 6, wherein the signal-to-noise ratio of the single layer two port transmission mode
First layer signal to noise ratio in two layer two port transmission mode>
Second layer signal to noise ratio
Wherein, H11 is a channel estimation response between the first receiving port and the first transmitting port, H12 is a channel estimation response between the first receiving port and the second transmitting port, H21 is a channel estimation response between the second receiving port and the first transmitting port, and H22 is a channel estimation response between the second receiving port and the second transmitting port; n0 is gaussian white noise.
8. The apparatus for calculating TPMI and RI based on SRS signals of 5G small cell according to claim 6, wherein the single layer two portsChannel capacity for transmission mode
Channel capacity of the two-layer two-port transmission mode
Wherein, H11 is a channel estimation response between the first receiving port and the first transmitting port, H12 is a channel estimation response between the first receiving port and the second transmitting port, H21 is a channel estimation response between the second receiving port and the first transmitting port, and H22 is a channel estimation response between the second receiving port and the second transmitting port; NO is gaussian white noise.
9. The apparatus for calculating TPMI and RI based on SRS signals of a 5G small cell as claimed in claim 6, wherein the single layer two port mode includes 6 precoding matrices, respectively:
mapped tmpi0=0;
mapped tmpi1=1; />
Mapped tmpi2=2; />
Mapped tmpi3=3; />
Mapped tmpi4=4; />
MappingTmpi5=5; where j is a complex number.
10. The apparatus for calculating TPMI and RI based on SRS signals of 5G small cell according to claim 6, wherein the two-layer two-port pattern includes 3 precoding matrices respectively
Mapped tmpio=0;
mapped tmpi1=1; />
Mapped tmpi2=2. />
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