A method and system for receiving physical broadcast channels in a multiple-input multiple-output system.

Abstract

This invention provides a method and system for receiving the physical broadcast channel (PBCH) in a multiple-input multiple-output (MIMO) system, comprising: step S1, obtaining frequency domain channel estimates of demodulation reference signals from multiple cells on the physical broadcast channel symbols, wherein the multiple cells include a serving cell and co-frequency cells; step S2, extracting resource elements of the serving cell from the frequency domain resources of the physical broadcast channel; and step S3, performing MIMO demodulation processing on the frequency domain channel estimates of each cell and the resource elements of the serving cell to obtain soft bit information of each cell. Beneficial effects: This invention, by utilizing information from co-frequency cells and jointly performing MIMO demodulation processing on the serving cell and co-frequency cells, solves the performance problem of PBCH reception in multiple-input multiple-output systems when co-frequency cell interference exists, thus improving the PBCH reception performance in multiple-input multiple-output systems under co-frequency conditions.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to a method and system for receiving physical broadcast channels in a multiple-input multiple-output (MIMO) system. Background Technology

[0002] Multiple-input multiple-output (MIMO) is a technique in wireless communication that uses multiple antennas to simultaneously transmit and receive signals. MIMO technology can distinguish between signals sent to or originating from different spatial locations. Through techniques such as spatial multiplexing and spatial diversity, it can improve system capacity, coverage, and signal-to-noise ratio without increasing bandwidth usage.

[0003] In the communication process of a multiple-input multiple-output system, the terminal device needs to receive and parse the Physical Broadcast Channel (PBCH) signal sent by the base station when accessing the network.

[0004] In the MIMO processing of the physical broadcast channel, when there is co-channel interference, the resource element (RE) of the physical broadcast channel will be affected by the physical broadcast channel PBCH signal or the physical broadcast channel demodulation reference signal (PBCH-DMRS) from neighboring cells. Existing technologies usually ignore the interference from neighboring cells, and the input parameters of the MIMO demodulator are only the channel estimation of the serving cell and the received PBCH RE data, and single-user detection of MIMO is performed.

[0005] Because existing technologies ignore interference information from neighboring cells on the same frequency, the reception performance of physical broadcast channels is poor. Summary of the Invention

[0006] To address the above technical problems, this invention provides a method and system for receiving physical broadcast channels in a multiple-input multiple-output (MIMO) system.

[0007] The technical problem solved by this invention can be achieved by the following technical solutions:

[0008] A method for receiving a physical broadcast channel in a multiple-input multiple-output system includes:

[0009] Step S1: Obtain the frequency domain channel estimate of the demodulation reference signal of multiple cells on the physical broadcast channel symbol, wherein the multiple cells include the serving cell and the co-frequency cell;

[0010] Step S2: Extract the resource elements of the serving cell from the frequency domain resources of the physical broadcast channel;

[0011] Step S3: Perform MIMO demodulation processing on the frequency domain channel estimation value of each cell and the resource elements of the serving cell to obtain the soft bit information of each cell.

[0012] Preferably, after step S3, the method further includes:

[0013] Step S4: Extract the soft bit information of the serving cell;

[0014] Step S5: Perform bit-level processing on the soft bit information.

[0015] Preferably, step S1 specifically includes:

[0016] Step S11: Obtain the demodulation reference signal of each cell in the frequency domain resources of the physical broadcast channel symbol, and the resource elements of each cell;

[0017] Step S12: Obtain the frequency domain channel estimate based on the demodulation reference signal and the resource element.

[0018] Preferably, step S11 includes:

[0019] Step S111: Obtain the physical identifiers of the multiple cells;

[0020] Step S112: Generate the demodulation reference signal of the physical broadcast channel symbol for each cell in the frequency domain resource based on the physical identifier.

[0021] Preferably, step S12 further includes:

[0022] The frequency domain channel estimate of the co-frequency cell is interpolated to ensure that it is consistent with the channel estimate of the serving cell in terms of frequency domain resources.

[0023] Preferably, step S2 specifically includes:

[0024] Step S21: Obtain time-domain data of multiple receiving antennas on the physical broadcast channel symbol;

[0025] Step S22: Perform time-frequency conversion on the time-domain data to obtain frequency-domain data on the physical broadcast channel symbol;

[0026] Step S23: Extract data from the frequency domain data to obtain the resource elements of the serving cell.

[0027] Preferably, step S11 further includes:

[0028] Step S113: Obtain the position of the demodulation reference signal in the frequency domain for each of the cells;

[0029] Step S114: Extract the resource elements of each cell from the frequency domain data on the physical broadcast channel symbol according to the position of the demodulation reference signal of each cell in the frequency domain.

[0030] The present invention also provides a physical broadcast channel receiving system for a multiple-input multiple-output (MIMO) system, characterized in that the physical broadcast channel receiving method for implementing the above-described MIMO system includes:

[0031] The acquisition unit is used to acquire the frequency domain channel estimate of the demodulation reference signal of multiple cells on the physical broadcast channel symbol, wherein the multiple cells include the serving cell and the co-frequency cell;

[0032] The extraction unit is used to extract resource elements of the serving cell from the frequency domain resources of the physical broadcast channel;

[0033] The MIMO demodulation unit, connected to the acquisition unit and the extraction unit respectively, is used to perform MIMO demodulation processing on the frequency domain channel estimation value of each cell and the resource element of the serving cell to obtain the soft bit information of each cell.

[0034] Preferably, it further includes:

[0035] A soft bit extraction unit, connected to the MIMO demodulation unit, is used to extract the soft bit information of the serving cell;

[0036] A bit-level processing unit, connected to the soft bit extraction unit, is used to perform bit-level processing on the soft bit information.

[0037] Preferably, the acquisition unit includes:

[0038] The acquisition module is used to acquire the demodulation reference signal of each cell in the frequency domain resources of the physical broadcast channel symbol, and the resource elements of each cell;

[0039] The channel estimation module, connected to the acquisition module, is used to obtain the frequency domain channel estimation value based on the demodulation reference signal and the resource element.

[0040] The advantages or beneficial effects of the technical solution of this invention are as follows:

[0041] This invention utilizes information from co-frequency cells to jointly perform MIMO demodulation processing on the serving cell and co-frequency cells, thereby solving the performance problem of PBCH reception in multiple-input multiple-output systems when there is co-frequency cell interference, and improving the reception and demodulation performance of PBCH in co-frequency environments in multiple-input multiple-output systems. Attached Figure Description

[0042] Figure 1 A flowchart illustrating a physical broadcast channel receiving method for a multiple-input multiple-output system, as described in a preferred embodiment of the present invention.

[0043] Figure 2 This is a flowchart illustrating the specific implementation of the physical broadcast channel receiving method for a multiple-input multiple-output system, as a preferred embodiment of the present invention.

[0044] Figure 3 In a preferred embodiment of the present invention, a schematic diagram of the specific implementation of obtaining the frequency domain channel estimation value in step S1 is provided.

[0045] Figure 4 In a preferred embodiment of the present invention, a flowchart illustrating the specific implementation of obtaining the demodulation reference signal in step S11 is provided.

[0046] Figure 5 This is a flowchart illustrating the specific implementation of step S2 in a preferred embodiment of the present invention.

[0047] Figure 6 In a preferred embodiment of the present invention, a flowchart illustrating the specific implementation of step S11, obtaining resource elements of each cell, is provided.

[0048] Figure 7 A block diagram of a physical broadcast channel receiving system for a multiple-input multiple-output system is shown in a preferred embodiment of the present invention.

[0049] Figure 8 In a preferred embodiment of the present invention, a structural block diagram of the specific implementation of the acquisition unit is shown. Detailed Implementation

[0050] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment; other embodiments that conform to the spirit of the present invention may also fall within the scope of the present invention.

[0051] See Figure 1 In a preferred embodiment of the present invention, based on the above-mentioned problems existing in the prior art, a method for receiving a physical broadcast channel in a multiple-input multiple-output system is provided, comprising:

[0052] Step S1: Obtain the frequency domain channel estimate of the demodulation reference signal of multiple cells on the physical broadcast channel symbol, where the multiple cells include the serving cell and co-frequency cells;

[0053] Step S2: Extract the resource elements of the serving cell from the frequency domain resources of the physical broadcast channel;

[0054] Step S3: Perform MIMO demodulation processing on the frequency domain channel estimation values ​​of each cell and the resource elements of the serving cell to obtain the soft bit information of each cell.

[0055] Specifically, this invention addresses the problem in existing technologies where poor reception performance of the physical broadcast channel (PBCH) is caused by ignoring interference information from neighboring cells in the same frequency range during MIMO processing. In this embodiment, the invention fully utilizes the PBCH information of the serving cell and neighboring cells in the same frequency range during MIMO processing, incorporating the serving cell and cells in the MIMO demodulator for joint processing. This suppresses neighboring cell interference, improves the reception performance of the serving cell, and further enhances the reception and demodulation performance of the PBCH. Treating the PBCHs of multiple cells as multiple users is similar to the multi-user, multiple-input multiple-output (MU-MIMO) multi-user processing method of the Physical Downlink Shared Channel (PDSCH).

[0056] In a preferred embodiment, such as Figure 2 As shown, after step S3, the following steps are also included:

[0057] Step S4: Extract the soft bit information of the serving cell;

[0058] Step S5: Perform bit-level processing on the soft bit information.

[0059] Specifically, in this embodiment, after MIMO demodulation, the soft bit information of the serving cell is extracted, processed, and sent to the subsequent stage for bit-level processing; however, the soft bit information output by MIMO demodulation of co-frequency cells is not processed at the bit level.

[0060] In a preferred embodiment, such as Figure 3 As shown, in step S1, the frequency domain channel estimate values ​​of the demodulation reference signal (DMRS) of multiple cells on the physical broadcast channel (PBCH) symbol are obtained, specifically including:

[0061] Step S11: Obtain the demodulation reference signal of each cell in the frequency domain resources of the physical broadcast channel symbols, and the resource element RE of each cell;

[0062] Step S12: Obtain the frequency domain channel estimate based on the demodulated reference signal and resource elements.

[0063] Specifically, in this embodiment, based on the demodulation reference signal of each cell in the frequency domain resource of the physical broadcast channel symbol and the resource element RE of each cell, the frequency domain channel estimate H of each cell in the symbol is obtained. (rx,cell,dmrs) Where rx is the receiving antenna index, cell is the cell index, and dmrs is the demodulation reference signal index.

[0064] In a preferred embodiment, such as Figure 4 As shown, step S11 includes:

[0065] Step S111: Obtain the physical identifiers of multiple cells;

[0066] Step S112: Generate demodulation reference signals for each cell in the frequency domain resources based on the physical identifiers of the physical broadcast channel symbols.

[0067] Specifically, in this embodiment, the physical identifier of each cell is obtained. The physical identifier is preferably the physical-layer cell identity (PCI). The PCI is used to distinguish the radio signals of different cells. In the LTE system, the value range is generally 0-503; in the NR system, the value range is generally 0-1007. Then, using the physical cell identifier, the PBCH-DMRS of each cell in the frequency domain of the physical broadcast channel PBCH symbol is generated, and the position of the DMRS RE of each cell in the frequency domain is obtained.

[0068] In a preferred embodiment, step S12 further includes:

[0069] Interpolation is performed on the frequency domain channel estimates of co-frequency cells to ensure that they are consistent with the channel estimates of the serving cell in terms of frequency domain resources.

[0070] Specifically, in order to obtain the frequency domain channel estimate H of the serving cell (rx,cell＝0,data) To maintain consistency in the frequency domain, in this embodiment, the frequency domain channel estimate H of the neighboring cell is... (rx,cell,dmrs) Interpolation is performed to obtain H (rx,cell,data) Where rx is the receiving antenna index, cell is the cell index, dmrs is the demodulation reference signal index, and data is the received data.

[0071] In a preferred embodiment, such as Figure 5 As shown, step S2 specifically includes:

[0072] Step S21: Obtain time-domain data of multiple receiving antennas on the physical broadcast channel symbol;

[0073] Step S22: Perform time-frequency conversion on the time-domain data to obtain the frequency-domain data on the physical broadcast channel symbols;

[0074] Step S23: Extract data from the frequency domain data to obtain the resource elements of the serving cell.

[0075] Specifically, in this embodiment, time-domain data y of multiple receiving antennas on the PBCH symbol is acquired. rxWhere rx is the receiving antenna index; then, for the time-domain data y rx Perform time-frequency transformation to obtain the frequency domain data Y on this symbol. rx Finally, from the frequency domain data Y rx Extract the PBCH data resource element Y of the serving cell. (rx,data) .

[0076] Then, Y (rx,data) And the frequency domain channel estimates H of each cell obtained above (rx,cell,data) The data is fed into a MIMO demodulator for multi-cell MIMO processing, and the soft bit information of each cell is output.

[0077] In a preferred embodiment, such as Figure 6 As shown, step S11 also includes:

[0078] Step S113: Obtain the position of the demodulation reference signal of each cell in the frequency domain;

[0079] Step S114: Extract the resource elements of each cell from the frequency domain data on the physical broadcast channel symbol based on the position of the demodulation reference signal of each cell in the frequency domain.

[0080] Specifically, in this embodiment, based on the frequency domain position of the DMRS of each cell, the frequency domain data Y is used to... rx Resource elements Y of the demodulation reference signal of each cell are extracted. (rx,cell,dmrs) Where cell is the cell index and dmrs is the demodulation reference signal index.

[0081] Furthermore, the frequency domain position of the demodulation reference signal can be obtained simultaneously with the generation of PBCH-DMRS using physical identifiers in step S112, thus obtaining the frequency domain position of the DMRS of each cell.

[0082] Furthermore, since existing MIMO only processes the PBCH of the serving cell, while PDSCH MIMO generally supports multiple-input multiple-output, i.e., processing by multiple receiving antennas and multiple layers, in this embodiment, the MIMO of the Physical Downlink Shared Channel (PDSCH) can be reused, so that no new MIMO demodulator needs to be added after adding co-frequency cells in this embodiment.

[0083] The layers mentioned above refer to spatial concepts, meaning that multiple data sets in the spatial domain are superimposed on the same time-frequency resources, which is equivalent to transmitting data in the three dimensions of time, frequency, and space. For PDSCH, the original layers refer to the layers of each user, while the layers in the PBCH processing process are not user data, but broadcast data from multiple cells (i.e., serving cell and co-frequency cells).

[0084] The present invention also provides a physical broadcast channel receiving system for a multiple-input multiple-output (MIMO) system, characterized in that it is used to implement the physical broadcast channel receiving method for a MIMO system as described above, such as... Figure 7 As shown, it includes:

[0085] Acquisition unit 1 is used to acquire frequency domain channel estimates of demodulation reference signals of multiple cells on the physical broadcast channel symbol, including serving cells and co-frequency cells;

[0086] Extraction unit 2 is used to extract resource elements of the serving cell from the frequency domain resources of the physical broadcast channel;

[0087] The MIMO demodulation unit 3 is connected to the acquisition unit 1 and the extraction unit 2 respectively. It is used to perform MIMO demodulation processing on the frequency domain channel estimation value of each cell and the resource elements of the serving cell to obtain the soft bit information of each cell.

[0088] Specifically, this invention addresses the problem in existing technologies where poor reception performance of the physical broadcast channel (PBCH) is caused by ignoring interference information from neighboring cells in the same frequency range during MIMO processing. In this embodiment, the invention fully utilizes the PBCH information of the serving cell and neighboring cells in the same frequency range during MIMO processing, incorporating the serving cell and cells in the MIMO demodulator for joint processing. This suppresses neighboring cell interference, improves the reception performance of the serving cell, and further enhances the reception and demodulation performance of the PBCH. Treating the PBCHs of multiple cells as multiple users is similar to the multi-user, multiple-input multiple-output (MU-MIMO) multi-user processing method of the Physical Downlink Shared Channel (PDSCH).

[0089] In a preferred embodiment, it further includes:

[0090] The soft bit extraction unit 4 is connected to the MIMO demodulation unit 3 and is used to extract the soft bit information of the serving cell.

[0091] Bit-level processing unit 5 is connected to soft bit extraction unit 4 and is used to perform bit-level processing on soft bit information.

[0092] Specifically, in this embodiment, after MIMO demodulation, the soft bit information of the serving cell is extracted, processed, and sent to the subsequent stage for bit-level processing; however, the soft bit information output by MIMO demodulation of co-frequency cells is not processed at the bit level.

[0093] In a preferred embodiment, such as Figure 8As shown, the acquisition unit 1 includes:

[0094] The acquisition module 11 is used to acquire the demodulation reference signal of each cell in the frequency domain resources of the physical broadcast channel symbols, as well as the resource elements of each cell;

[0095] The channel estimation module 12 is connected to the acquisition module 11 and is used to obtain the frequency domain channel estimation value based on the demodulation reference signal and resource elements.

[0096] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made using the content of this specification and illustrations should be included within the protection scope of the present invention.

Claims

1. A method of receiving a physical broadcast channel in a multiple-input multiple-output system, the method comprising: include: Step S1: Obtain the frequency domain channel estimate of the demodulation reference signal of multiple cells on the physical broadcast channel symbol, wherein the multiple cells include the serving cell and the co-frequency cell; Step S2: Extract the resource elements of the serving cell from the frequency domain resources of the physical broadcast channel; Step S3: Multiplex the physical downlink shared channel MIMO, perform MIMO demodulation processing on the frequency domain channel estimate of each cell and the resource elements of the serving cell to obtain the soft bit information of each cell; Step S1 specifically includes: Step S11: Obtain the demodulation reference signal of each cell in the frequency domain resources of the physical broadcast channel symbol, and the resource elements of each cell; Step S12: Obtain the frequency domain channel estimate based on the demodulation reference signal and the resource element.

2. The method for receiving a physical broadcast channel in a multiple-input multiple-output system according to claim 1, characterized in that, After step S3, the method further includes: Step S4: Extract the soft bit information of the serving cell; Step S5: Perform bit-level processing on the soft bit information.

3. The method for receiving a physical broadcast channel in a multiple-input multiple-output system according to claim 1, characterized in that, Step S11 includes: Step S111: Obtain the physical identifiers of the multiple cells; Step S112: Generate the demodulation reference signal of the physical broadcast channel symbol for each cell in the frequency domain resource based on the physical identifier.

4. The method for receiving a physical broadcast channel in a multiple-input multiple-output system according to claim 1, characterized in that, Step S12 further includes: The frequency domain channel estimate of the co-frequency cell is interpolated to ensure that it is consistent with the channel estimate of the serving cell in terms of frequency domain resources.

5. The method for receiving a physical broadcast channel in a multiple-input multiple-output system according to claim 3, characterized in that, Step S2 specifically includes: Step S21: Obtain time-domain data of multiple receiving antennas on the physical broadcast channel symbol; Step S22: Perform time-frequency conversion on the time-domain data to obtain frequency-domain data on the physical broadcast channel symbol; Step S23: Extract data from the frequency domain data to obtain the resource elements of the serving cell.

6. The method for receiving a physical broadcast channel in a multiple-input multiple-output system according to claim 5, characterized in that, Step S11 further includes: Step S113: Obtain the position of the demodulation reference signal in the frequency domain for each of the cells; Step S114: Extract the resource elements of each cell from the frequency domain data on the physical broadcast channel symbol according to the position of the demodulation reference signal of each cell in the frequency domain.

7. A physical broadcast channel receiving system for a multiple-input multiple-output system, characterized in that, A method for receiving a physical broadcast channel in a multiple-input multiple-output system as described in any one of claims 1-6, comprising: The acquisition unit is used to acquire the frequency domain channel estimate of the demodulation reference signal of multiple cells on the physical broadcast channel symbol, wherein the multiple cells include the serving cell and the co-frequency cell; The extraction unit is used to extract resource elements of the serving cell from the frequency domain resources of the physical broadcast channel; The MIMO demodulation unit, connected to the acquisition unit and the extraction unit respectively, is used to perform MIMO demodulation processing on the frequency domain channel estimation value of each cell and the resource element of the serving cell to obtain the soft bit information of each cell.

8. The physical broadcast channel receiving system of the multiple-input multiple-output system according to claim 7, characterized in that, Also includes: A soft bit extraction unit, connected to the MIMO demodulation unit, is used to extract the soft bit information of the serving cell; A bit-level processing unit, connected to the soft bit extraction unit, is used to perform bit-level processing on the soft bit information.

9. The physical broadcast channel receiving system of a multiple-input multiple-output system according to claim 7, characterized in that, The acquisition unit includes: The acquisition module is used to acquire the demodulation reference signal of each cell in the frequency domain resources of the physical broadcast channel symbol, and the resource elements of each cell; The channel estimation module, connected to the acquisition module, is used to obtain the frequency domain channel estimation value based on the demodulation reference signal and the resource element.

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