WO2015149709A1 - 一种噪声功率估计方法及网络侧设备 - Google Patents
一种噪声功率估计方法及网络侧设备 Download PDFInfo
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- WO2015149709A1 WO2015149709A1 PCT/CN2015/075762 CN2015075762W WO2015149709A1 WO 2015149709 A1 WO2015149709 A1 WO 2015149709A1 CN 2015075762 W CN2015075762 W CN 2015075762W WO 2015149709 A1 WO2015149709 A1 WO 2015149709A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/024—Channel estimation channel estimation algorithms
- H04L25/025—Channel estimation channel estimation algorithms using least-mean-square [LMS] method
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/022—Channel estimation of frequency response
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
Definitions
- the present invention relates to the field of wireless communication technologies, and in particular, to a noise power estimation method and a network side device.
- Channel estimation and noise power estimation algorithms have a critical impact on the throughput performance of wireless mobile communication systems.
- the channel estimation algorithm can use Least Squares (LS), Inverse Discrete Fourier Transform (IDFT) transform domain method and Minimum Mean Square Error (MMSE) linear estimation. algorithm.
- LS Least Squares
- IDFT Inverse Discrete Fourier Transform
- MMSE Minimum Mean Square Error
- a typical channel estimation algorithm for Long Term Evolution (LTE) uplink system is a channel estimation algorithm based on IDFT transform. The advantage is that channel estimation and noise power estimation can be performed simultaneously.
- the channel estimation method is as shown in FIG. 1 and includes the following steps:
- Step 101 Perform frequency domain LS channel estimation on the pilot symbols to obtain an initial frequency domain channel estimation value.
- Step 102 Perform IDFT transform on the initial frequency domain channel estimation value to obtain a time domain channel estimation sequence before processing.
- Step 103 Perform windowing and noise suppression operation on the time domain channel estimation sequence to obtain a noise suppression time domain channel estimation sequence h' P .
- Step 104 Perform a DFT (Discrete Fourier Transform) transform on the noise-suppressed time domain channel estimation sequence to obtain a frequency domain channel estimation value H′ P of the pilot symbol.
- DFT Discrete Fourier Transform
- Step 105 Perform time domain linear interpolation on the frequency domain channel estimation value of the pilot symbol to obtain a frequency domain channel estimation value H' Data of the data symbol.
- step 103 specifically includes:
- step 1031 noise power estimation is performed. Selecting a user signal window and an interference noise window, and then performing noise power estimation according to a time domain signal path in the interference noise window to obtain a noise power value;
- Step 1032 determining the threshold TH of the effective time domain signal path according to the strongest time domain signal path and the noise power value in the user signal window;
- Step 1033 Filter the time domain signal path that needs to be reserved in the user signal window according to the threshold value, and the time domain that does not need to be reserved The signal path is set to zero;
- Step 1034 Zero the time domain signal path in the noise window to obtain a time-domain channel estimation sequence h' P of the noise suppression.
- the user signal window and the interference noise window selected in step 1031 are as shown in FIG. 2.
- the interference and noise are distributed differently in all time-domain windows including the user signal window and the interference noise window, which may cause the noise power value obtained by the noise power estimation to be too large.
- the threshold value when the effective time domain signal path is selected is too large, and some real time domain signal paths are missed when the effective time domain signal path is selected, which affects the channel. Estimated accuracy.
- the present invention provides a noise power estimation method and a network side device, which are used to solve the problem that the noise power value obtained by estimating the noise power in the prior art is excessive.
- An embodiment of the present invention provides a noise power estimation method, where the method includes:
- the network side device uses all time domain signal paths except the user signal window in the target cell as the interference noise window;
- the network side device performs noise power estimation according to a time domain signal path in the interference noise window.
- the accuracy of the noise power estimation is improved by using all time domain signal paths outside the user signal window in the target cell as the interference noise window.
- the network side device determines the user signal window according to the following manner:
- the network side device determines the length of the user signal window according to the number of user equipments multiplexed on the same PRB and the maximum signal window value in all cells currently managed by the network side device;
- the network side device selects a user signal window in the target cell according to the length of the user signal window.
- the user signal window selected by the network side device does not include the same time domain signal path as the user signal window of the specific cell;
- the specific cell is an interference cell of the target cell, and is managed by the network side device.
- the performing noise power estimation according to the time domain signal path in the interference noise window comprises:
- noise power value an average value of the power value of the time domain signal path that is smaller than the threshold in the interference noise window
- the average value of the power values of the smallest N time domain signal paths in the interference noise window is taken as the noise power value, and N is a positive integer.
- the method further includes:
- the network side device uses the noise power value obtained by estimating the noise power as a threshold value of the effective time domain signal path used for channel estimation.
- the interference noise value is directly used as the threshold value for determining the effective time domain signal path, which can prevent some real time domain signal paths from being missed when the effective time domain signal path is selected, thereby improving channel estimation.
- the accuracy is directly used as the threshold value for determining the effective time domain signal path, which can prevent some real time domain signal paths from being missed when the effective time domain signal path is selected, thereby improving channel estimation.
- the embodiment of the invention further provides a network side device for estimating noise power, and the device includes:
- a window finder module configured to use all time domain signal paths except the user signal window in the target cell as an interference noise window
- a processing module configured to perform noise power estimation according to a time domain signal path in the interference noise window.
- the accuracy of the noise power estimation is improved by using all time domain signal paths outside the user signal window in the target cell as the interference noise window.
- the window finder module is further configured to determine a user signal window according to the following manner:
- a user signal window is selected in the target cell.
- the user signal window selected by the window finder module does not include the same time domain signal path as the user signal window of the specific cell;
- the specific cell is an interference cell of the target cell, and is managed by the network side device.
- the processing module is specifically configured to:
- noise power value an average value of the power value of the time domain signal path that is smaller than the threshold in the interference noise window
- the average value of the power values of the smallest N time domain signal paths in the interference noise window is taken as the noise power value, and N is a positive integer.
- the processing module is further configured to:
- the noise power value obtained by estimating the noise power is used as the threshold value of the effective time domain signal path used for channel estimation.
- the interference noise value is directly used as the threshold value for determining the effective time domain signal path, which can prevent some real time domain signal paths from being missed when the effective time domain signal path is selected, thereby improving channel estimation.
- the accuracy is directly used as the threshold value for determining the effective time domain signal path, which can prevent some real time domain signal paths from being missed when the effective time domain signal path is selected, thereby improving channel estimation.
- the embodiment of the invention further provides a network side device for estimating noise power, and the device includes:
- a processor configured to use all time domain signal paths except the user signal window in the target cell as an interference noise window; and perform noise power estimation according to a time domain signal path in the interference noise window;
- a transceiver for receiving and transmitting data under the control of a processor.
- the noise power estimation is improved by using all time domain signal paths except the user signal window in the target cell as the interference noise window. Accuracy of the meter.
- the processor is specifically configured to:
- control transceiver After determining that the UE needs to be self-configured, the control transceiver sends information indicating that the UE needs to perform self-configuration to the network side device.
- the processor is further configured to determine the user signal window according to the following manner:
- a user signal window is selected in the target cell.
- the user signal window selected by the processor does not include the same time domain signal path as the user signal window of the specific cell; wherein the specific cell is the interference cell of the target cell, and is managed by the same network side device.
- the processor is specifically configured to:
- the average value of the power values of all time domain signal paths in the interference noise window is taken as the noise power value
- the average value of the power values of the time domain signal path that is less than the threshold within the noise window is used as the noise power value;
- the average value of the power values of the smallest N time domain signal paths in the interference noise window is taken as the noise power value, and N is a positive integer.
- the processor is further configured to:
- the noise power value obtained by estimating the noise power is used as the threshold value of the effective time domain signal path used for channel estimation.
- the interference noise value is directly used as the threshold value for determining the effective time domain signal path, which can prevent some real time domain signal paths from being missed when the effective time domain signal path is selected, thereby improving channel estimation.
- the accuracy is directly used as the threshold value for determining the effective time domain signal path, which can prevent some real time domain signal paths from being missed when the effective time domain signal path is selected, thereby improving channel estimation.
- FIG. 2 is a schematic diagram of a user signal window and an interference noise window selected when performing noise power estimation in the background art
- FIG. 3 is a schematic structural diagram of a network side device for estimating noise power according to Embodiment 1 of the present application;
- FIG. 4 is a schematic structural diagram of a network side device for estimating noise power according to Embodiment 2 of the present application;
- FIG. 5 is a flowchart of a method for estimating noise power according to Embodiment 4 of the present application.
- FIG. 6 is a flowchart of a method for estimating noise power according to Embodiment 5 of the present application.
- FIG. 7 is a schematic diagram of a user signal window and an interference noise window selected in Embodiment 5 of the present application;
- FIG. 8 is a flowchart of a method for estimating noise power according to Embodiment 6 of the present application.
- FIG. 9 is a schematic diagram of a user signal window and an interference noise window selected in Embodiment 6 of the present application.
- FIG. 10 is a flowchart of a method for estimating noise power provided in Embodiment 7 of the present application.
- FIG. 11 is a schematic diagram of a user signal window and an interference noise window selected in Embodiment 7 of the present application;
- FIG. 12 is a flowchart of a channel estimation method according to Embodiment 8 of the present application.
- the X-axis represents the time domain index value corresponding to the time domain channel estimate
- the Y-axis represents the time domain channel estimate
- GSM Global System of Mobile communication
- CDMA Code Division Multiple Access
- WCDMA Wideband Code Division Multiple Access
- GPRS General Packet Radio Service
- LTE Long Term Evolution
- LTE-A Advanced Long Term Evolution
- UMTS Universal Mobile Telecommunication System
- the user equipment includes but is not limited to a mobile station (MS, Mobile Station), a mobile terminal (Mobile Terminal), a mobile telephone (Mobile Telephone), a mobile phone (handset). And portable devices, etc., the user equipment can communicate with one or more core networks via a Radio Access Network (RAN), for example, the user equipment can be a mobile phone (or "cellular"
- RAN Radio Access Network
- the user equipment can be a mobile phone (or "cellular"
- the telephone device, the computer with wireless communication function, etc., the user equipment can also be a mobile device that is portable, pocket-sized, handheld, built-in, or in-vehicle.
- a base station may refer to a device in an access network that communicates with a wireless terminal over one or more sectors over an air interface.
- the base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network.
- IP Internet Protocol
- the base station can also coordinate attribute management of the air interface.
- the base station may be a Base Transceiver Station (BTS) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved base station in LTE (NodeB or eNB or e-NodeB, evolutional Node B), the invention is not limited.
- BTS Base Transceiver Station
- NodeB base station
- NodeB evolved base station
- LTE Long Term Evolutional Node B
- the interference noise window when the interference noise window is selected, all time domain signal paths except the user signal window in the target cell are used as interference noise windows, and noise power estimation is performed according to the time domain signal path in the interference noise window. Since the window length of the selected interference noise window is large, the problem that the calculated interference noise power is larger than the actual interference noise power due to the interference noise window containing only one interference cell signal is avoided, and the interference noise window can be The inclusion of all possible specific interfering cell signals is statistically more accurate, so the estimated interference noise power is closer to the real interfering noise power value, thereby improving the accuracy of the channel estimation.
- the structure of the network side device for estimating the noise power of the first embodiment of the present application includes:
- the window finder module 300 is configured to use all time domain signal paths except the user signal window in the target cell as an interference noise window;
- the processing module 310 is configured to perform noise power estimation according to a time domain signal path in the interference noise window.
- the window finder module 300 is further configured to determine a user signal window according to the following manner:
- the length of the user signal window is determined according to the number of user equipments currently accessed in all cells managed by the network side device, and the maximum signal window value:
- the number of user equipments in all the cells managed by the network side device is currently accessed by the N user, the total user equipment of the cells is multiplexed on the same physical resource block (PRB), and the WLen Ref is the largest.
- the signal window value can be set according to the sum of the timing deviation measured by the network side device and the maximum multipath delay, or can be pre-configured by the network side device, length (Win Sig ) represents the length of the user signal window, and N PRB represents the allocation. PRB values to the user.
- the total number of time domain resources available to the user equipment in this embodiment is 12N PRB .
- the windowing module 300 selects a user signal window in the target cell based on the length of the user signal window.
- the user signal window Win Sig and the interference noise window Win Noise can be selected as follows:
- ⁇ represents the phase offset of the user's DeModulation Reference Signal (DMRS) symbol
- M 1 and M 2 represent the front and rear window sizes of the user signal window, respectively
- M 3 represents the window length of the interference noise window.
- the values of M 1 , M 2 and M 3 are directly configured by the network side device, and mod ( ⁇ ) represents the modulo operation.
- M 3 is automatically determined after determining the user signal window, and thus the configuration parameters ⁇ , M 1 and M 2 can be configured. Determine the position of the user signal window and the interference noise window in the time domain.
- the user signal window selected by the windowing module does not include the same time domain signal path as the user signal window of the specific cell; wherein, the specific cell is the interference cell of the target cell, and is managed by the same network side device.
- the specific cell is the interference cell of the target cell, and is managed by the same network side device.
- the network side device in the embodiment of the present application may be a type of base station, such as a macro base station, a home base station, or the like, or a relay node (RN) device, or other network side devices.
- a base station such as a macro base station, a home base station, or the like
- RN relay node
- the processing module 310 may perform the noise power estimation on the time domain signal path in the interference noise window in a plurality of manners to obtain the noise power value, which may include, but is not limited to, the following methods:
- the average value of the power values of all the time domain signal paths in the interference noise window is taken as the noise power value, and the specific processing manner is as follows:
- real( ⁇ ) and imag( ⁇ ) represent the real part and the imaginary part, respectively.
- the average value of the power values of the time domain signal path that is less than the threshold in the noise window is used as the noise power value.
- the threshold value is used to filter the power value of the excessive time domain signal path to avoid excessively obtained noise power value.
- N' represents the number of time domain signal paths excluded after comparison with the threshold, and N' is a non-negative integer.
- the average value of the power values of the smallest N time domain signal paths in the interference noise window is taken as the noise power value, where N is a positive integer.
- N can be set to half of the total number of time domain signal paths in the interference noise window.
- N can be set to exceed half of the total time domain signal path in the interference noise window. Positive integers to improve the accuracy of noise power values.
- real( ⁇ ) and imag( ⁇ ) represent the real part and the imaginary part, respectively, and N is a positive integer.
- processing module 310 is further configured to:
- the noise power value obtained by estimating the noise power is used as the threshold value of the effective time domain signal path used for channel estimation.
- the structure of the network side device for estimating the noise power of the second embodiment of the present application includes:
- the processor 400 is configured to use all time domain signal paths except the user signal window in the target cell as an interference noise window; and perform noise power estimation according to the time domain signal path in the interference noise window;
- the transceiver 410 is configured to receive and transmit data under the control of the processor 400.
- the processor 400 is specifically configured to:
- control transceiver 410 After determining that the UE needs to be self-configured, the control transceiver 410 transmits information indicating that the UE needs to perform self-configuration to the network side device.
- the processor 400 is further configured to determine a user signal window according to the following manner:
- a user signal window is selected in the target cell.
- the user signal window selected by the processor 400 does not include the same time domain signal path as the user signal window of the specific cell; wherein the specific cell is the interfering cell of the target cell, and is managed by the same network side device.
- the processor 400 is specifically configured to:
- the average value of the power values of all time domain signal paths in the interference noise window is taken as the noise power value
- the average value of the power values of the time domain signal path that is less than the threshold within the noise window is used as the noise power value;
- the average value of the power values of the smallest N time domain signal paths in the interference noise window is taken as the noise power value, and N is a positive integer.
- the processor 400 is further configured to:
- the noise power value obtained by estimating the noise power is used as the threshold value of the effective time domain signal path used for channel estimation.
- the bus architecture can include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 400 and various circuits of memory represented by memory 420.
- the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
- the bus interface provides an interface.
- the transceiver 410 can be a plurality of components, including a transmitter and a receiver, for providing communication with various other devices on a transmission medium. unit.
- the processor 400 is responsible for managing the bus architecture and general processing, and the memory 420 can store data used by the processor 400 when performing operations.
- the processor 400 is responsible for managing the bus architecture and general processing, and the memory 420 can store data used by the processor 400 when performing operations.
- the third embodiment of the present application further provides a channel estimation system, which includes any network side device of noise power estimation mentioned in Embodiment 1 and Embodiment 2.
- the network side device of the noise power estimation in the channel estimation system uses the noise power value as the threshold value of the effective time domain signal path used for channel estimation, and then the channel estimation system performs the channel according to the threshold value. estimate.
- the specific processing manner of the channel estimation system for performing channel estimation according to the threshold value includes, but is not limited to, the manner mentioned in the background art, and any other applicable prior art may be adopted.
- the threshold value when the effective time domain signal path is selected is relatively accurate compared with the prior art, which can reduce the partial real time domain signal path when the effective time domain signal path is selected. The possibility to improve the accuracy of channel estimation.
- a noise estimation method and a channel estimation method are separately provided in the embodiments of the present application, and the device corresponding to the methods is a network side device and a channel estimation system for noise estimation in the embodiment of the present application, and the method The principle of solving the problem is similar to that of the device. Therefore, the implementation of the method can be referred to the corresponding implementation in the device, and the repeated description is not repeated.
- the method for estimating noise power provided in Embodiment 4 of the present invention includes:
- Step 501 The network side device uses all time domain signal paths except the user signal window in the target cell as an interference noise window.
- Step 502 The network side device performs noise power estimation according to a time domain signal path in the interference noise window.
- the network side device determines the user signal window according to the following manner:
- the network side device determines the length of the user signal window according to the number of user equipments in all cells currently managed by the network side device and the maximum signal window value;
- the network side device selects a user signal window in the target cell according to the length of the user signal window.
- the user signal window selected by the network side device does not include the same time domain signal path as the user signal window of the specific cell; wherein the specific cell is the interference cell of the target cell, and is managed by the network side device.
- the noise power estimation is performed according to a time domain signal path within the interference noise window, including:
- the average value of the power values of all time domain signal paths in the interference noise window is taken as the noise power value
- the average value of the power values of the time domain signal path that is less than the threshold within the noise window is used as the noise power value;
- the average value of the power values of the smallest N time domain signal paths in the interference noise window is taken as the noise power value, and N is a positive integer.
- the method further includes:
- the network side device uses the noise power value obtained by estimating the noise power as the threshold value of the effective time domain signal path used for channel estimation.
- the method for estimating noise power provided in Embodiment 5 of the present invention includes:
- Step 601 The network side device determines the length of the user signal window length (Win Sig ) according to the number N user, total , and the maximum signal window value WLen Ref of all the user equipments currently accessed to the network side device. .
- the user signal window length is 2N PRB .
- Step 602 The network side device selects a user signal window in the target cell according to the length of the user signal window.
- the user signal window can be selected according to Equation 2 by setting appropriate parameters ⁇ , M 1 and M 2 .
- the distance between the two user signal windows in the same cell is maximized in the time domain to ensure that the selected user signal window does not include the same time domain signal path as the user signal window of the specific cell.
- the specific cell is an interfering cell of the target cell, and is managed by the same network side device.
- Cell 1 user signal of user 1 occupies the window [0,2N PRB -1], the user signals the user 2 occupies the window [2N PRB, 8N PRB -1] ;
- the user signal window of user 1 occupies [2N PRB , 4N PRB -1], and the user signal window of user 2 occupies [8N PRB , 10N PRB -1];
- the user signal window of user 1 occupies [4N PRB , 6N PRB -1], and the user signal window of user 2 occupies [10N PRB , 12N PRB -1].
- the user signal window numbered from zero, [0,2N PRB -1] indicates the number of signal path 2N PRB from 0 to 2N PRB -1 time domain.
- Step 603 The network side device uses all time domain signal paths except the user signal window in the target cell as the interference noise window:
- the user signal window and the interference noise window selected in this embodiment are as shown in FIG. 7.
- Step 604 the average value of the power values of all time domain signal paths in the interference noise window is taken as the noise power value.
- real( ⁇ ) and imag( ⁇ ) represent the real part and the imaginary part, respectively.
- the noise power estimation method provided in Embodiment 6 of the present invention includes:
- Step 801 The network side device determines the length of the user signal window length (Win Sig ) according to the number N user, total , and the maximum signal window value WLen Ref of all the user equipments currently accessed to the network side device. .
- Step 802 The network side device selects a user signal window in the target cell according to the length of the user signal window.
- the user signal window can be selected according to Equation 2 by setting appropriate parameters ⁇ , M 1 and M 2 .
- the distance between the two user signal windows in the same cell is maximized in the time domain to ensure that the selected user signal window does not include the same time domain signal path as the user signal window of the specific cell.
- the specific cell is an interfering cell of the target cell, and is managed by the same network side device.
- user 1's user signal window occupies [0, 3N PRB -1]
- user 2's user signal window occupies [6N PRB , 9N PRB -1];
- the user signal window of user 1 occupies [3N PRB , 6N PRB -1], and the user signal window of user 2 occupies [9N PRB , 12N PRB -1];
- Step 803 The network side device uses all time domain signal paths except the user signal window in the target cell as the interference noise window:
- the user signal window and the interference noise window selected in this embodiment are as shown in FIG. 9.
- Step 804 the average value of the power values of the time domain signal paths smaller than the threshold in the interference noise window is used as the noise power value.
- N' represents the number of time domain signal paths excluded after comparison with the threshold, and N' is a non-negative integer.
- the method for estimating noise power provided in Embodiment 7 of the present invention includes:
- Step 1001 The network side device determines the length of the user signal window length (Win Sig ) according to the number N user, total , and the maximum signal window value WLen Ref of all the user equipments currently accessed to the network side device. .
- Step 1002 The network side device selects a user signal window in the target cell according to the length of the user signal window.
- the user signal window can be selected according to Equation 2 by setting appropriate parameters ⁇ , M 1 and M 2 .
- the distance between the two user signal windows in the same cell is maximized in the time domain to ensure that the selected user signal window does not include the same time domain signal path as the user signal window of the specific cell.
- the specific cell is an interference cell of the target cell, and is managed by the network side device.
- the user signal window of user 1 occupies [0, 2N PRB -1] ⁇ [11N PRB , 12N PRB -1], and the user signal window of user 2 occupies [5N PRB , 8N PRB -1];
- the user signal window of user 1 occupies [2N PRB , 5N PRB -1], and the user signal window of user 2 occupies [8N PRB , 11N PRB -1];
- Step 1003 The network side device uses all time domain signal paths except the user signal window in the target cell as the interference noise window:
- the user signal window and the interference noise window selected in this embodiment are as shown in FIG.
- Step 1004 The average value of the power values of the smallest N time domain signal paths in the interference noise window is taken as the noise power value.
- Sort: h i sort(h' i ), where sort( ⁇ ) indicates sorting from small to large.
- real( ⁇ ) and imag( ⁇ ) represent the real part and the imaginary part, respectively, and N is a positive integer.
- a channel estimation method according to Embodiment 8 of the present invention obtains a noise power value by using any noise power estimation method provided by an embodiment of the present application, and performs channel estimation according to the obtained noise power value. Proceed as follows:
- Step 1201 Perform LS channel estimation in the frequency domain, divide the received pilot symbols in the frequency domain and the local pilot base sequence to obtain an initial frequency domain channel estimation value.
- the signal model used in this step is the frequency domain equivalent receiving channel model of the LTE uplink SIMO:
- Y P represents the received pilot signal vector
- X P denotes a transmission pilot signal vector
- H P represents the frequency domain channel response vector
- W P represents received noise vector
- diag ⁇ X P ⁇ represents the elements in the main diagonal X P The diagonal matrix of the elements.
- Step 1202 Perform an IDFT transform of the initial frequency domain channel estimation value by N points to obtain a time domain channel estimation sequence before processing.
- F H represents a normalized IDFT matrix
- Step 1203 estimating a time domain channel sequence A window-suppressing operation is performed to obtain a time-domain channel estimation sequence h' P (n) after noise suppression.
- the step 1203 specifically includes:
- Step 12031 Acquire a noise power value by using any noise power estimation method provided by the embodiment of the present application.
- Step 12032 directly using the noise power value as a threshold TH for determining an effective time domain signal path
- the method for determining the threshold TH of the effective time domain signal path according to the strongest time domain signal path and the noise power value in the user signal window in the prior art may also be adopted:
- the power value representing the strongest time domain signal path within the user signal window, ⁇ and ⁇ are algorithm parameters.
- Step 12033 Filter the time domain signal path that needs to be reserved in the user signal window according to the threshold value, and set the time domain signal path that does not need to be reserved to zero:
- Win Sig represents the user signal window.
- Step 12034 the time domain signal path in the noise window is set to zero, and the time domain channel estimation sequence h' P (n) after the noise suppression is obtained:
- Win Sig represents the user signal window
- Win Noise represents the interference noise window
- Step 1204 Perform DFT on the noise-suppressed time domain channel estimation sequence to obtain a frequency domain channel estimation value H′ P of the pilot symbol:
- Step 1205 Perform time domain linear interpolation on the frequency domain channel estimation value of the pilot symbol to obtain a frequency domain channel estimation value H′ Data of the data symbol, and the specific interpolation algorithm may adopt an LS or MMSE linear interpolation algorithm.
- the interference noise window when the interference noise window is selected, all the time domain signal paths except the user signal window in the target cell are used as the interference noise window, which can improve the estimation accuracy of the interference noise value.
- the algorithm for adjusting the estimation of the interference noise value further improves the accuracy, and directly uses the interference noise value as the threshold value for determining the effective time domain signal path in the channel estimation, so that the accuracy of the channel estimation is also improved.
- the user signal window of the target cell is prevented from being interfered by the user signal in the specific cell, which further improves the accuracy of the channel estimation.
- embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
- computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
- the present invention is directed to a flowchart of a method, apparatus (system), and computer program product according to an embodiment of the present invention. And / or block diagram to describe. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG.
- These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device.
- the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
- the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
- These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
- the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
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Abstract
涉及无线通信技术领域,特别涉及噪声功率估计方法及网络侧设备,用以解决现有技术中存在噪声功率估计得到的噪声功率值过大的问题。本申请实施例在选取干扰噪声窗时,将目标小区中用户信号窗之外的全部时域信号径作为干扰噪声窗,能够提高干扰噪声值的估计准确性,并且在信道估计时将干扰噪声值直接作为确定有效时域信号径的门限值,能够防止在选取有效时域信号径时会漏掉部分真实的时域信号径,从而提高信道估计的准确性。
Description
本申请要求在2014年4月4日提交中国专利局、申请号为“201410136876.9”、发明名称为“一种噪声功率估计方法及网络侧设备”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
本发明涉及无线通信技术领域,特别涉及噪声功率估计方法及网络侧设备。
信道估计和噪声功率估计算法对于无线移动通信系统的吞吐量性能有至关重要的影响。信道估计算法可以采用最小二乘(Least Squares,LS)、基于离散傅里叶逆变换(Inverse Discrete Fourier Transform,IDFT)的变换域方法和最小均方误差(Minimum Mean Square Error,MMSE)等线性估计算法。长期演进(Long Term Evolution,LTE)上行系统典型的信道估计算法是基于IDFT变换的信道估计算法,好处在于可以同时进行信道估计和噪声功率估计。
在特定的同频组网场景下,同一个演进基站(evolved NodeB,eNB)管理的不同小区的基序列组号相同,同一个基站的不同小区采用不同循环时间移位区分。在该场景的上行虚拟多用户多输入多输出(Multi-User Multiple Input Multiple Output,MU-MIMO)条件下,信道估计的方法如图1所示,包括了以下几个步骤:
步骤103,对时域信道估计序列进行取窗抑噪操作,得到抑噪后的时域信道估计序列h′P。
步骤104,对抑噪后的时域信道估计序列进行DFT(Discrete Fourier Transform,离散傅里叶变换)变换,得到导频符号的频域信道估计值H′P。
步骤105,对导频符号的频域信道估计值进行时域线性插值,得到数据符号的频域信道估计值H′Data。
其中,步骤103具体包括:
步骤1031,进行噪声功率估计。选取用户信号窗和干扰噪声窗,然后根据干扰噪声窗内的时域信号径进行噪声功率估计,得到噪声功率值;
步骤1032,根据用户信号窗内的最强时域信号径和噪声功率值共同确定有效时域信号径的门限值TH;
步骤1033,根据门限值筛选用户信号窗内需要保留的时域信号径,将不需要保留的时域
信号径置零;
步骤1034,将噪声窗内的时域信号径置零,得到抑噪后的时域信道估计序列h′P。
上述方法中,在步骤1031中选取的用户信号窗和干扰噪声窗如图2所示。由于在上述特定的同频组网场景下,干扰和噪声在包括用户信号窗和干扰噪声窗在内的所有时域窗内分布不相同,会导致噪声功率估计得到的噪声功率值过大的问题。若采用偏大的噪声功率值进行信道估计,会使得选取有效时域信号径时的门限值过大,进而在选取有效时域信号径时会漏掉部分真实的时域信号径,影响信道估计的准确性。
发明内容
本发明提供一种噪声功率估计方法及网络侧设备,用以解决现有技术中存在噪声功率估计得到的噪声功率值过大的问题。
本发明实施例提供一种噪声功率估计方法,该方法包括:
网络侧设备将目标小区中用户信号窗之外的全部时域信号径作为干扰噪声窗;
所述网络侧设备根据所述干扰噪声窗内的时域信号径进行噪声功率估计。
通过将目标小区中用户信号窗之外的全部时域信号径作为干扰噪声窗,提高了噪声功率估计的准确性。
较佳地,所述网络侧设备根据下列方式确定用户信号窗:
所述网络侧设备根据当前接入到所述网络侧设备管理的所有小区中的复用在相同PRB上的用户设备的数量,以及最大信号窗口值,确定用户信号窗长度;
所述网络侧设备根据用户信号窗长度,在目标小区内选取用户信号窗。
较佳地,所述网络侧设备选取的用户信号窗与特定小区的用户信号窗不包含相同的时域信号径;
其中,所述特定小区为所述目标小区的干扰小区,且由所述网络侧设备管理。
通过上述方式选取用户信号窗,能够防止目标小区的用户信号窗受到特定小区内的用户信号干扰。
较佳地,所述根据所述干扰噪声窗内的时域信号径进行噪声功率估计,包括:
将所述干扰噪声窗内的全部时域信号径的功率值的平均值,作为噪声功率值;或
将所述干扰噪声窗内小于阈值的时域信号径的功率值的平均值,作为噪声功率值;或
将所述干扰噪声窗内最小的N个时域信号径的功率值的平均值,作为噪声功率值,N为正整数。
较佳地,所述网络侧设备根据所述干扰噪声窗内的时域信号径进行噪声功率估计之后,还包括:
所述网络侧设备将进行噪声功率估计得到的噪声功率值作为进行信道估计时使用的有效时域信号径的门限值。
由于噪声功率值较为准确,将干扰噪声值直接作为作为确定有效时域信号径的门限值,能够防止在选取有效时域信号径时会漏掉部分真实的时域信号径,从而提高信道估计的准确性。
本发明实施例还提供了一种噪声功率估计的网络侧设备,该设备包括:
取窗模块,用于将目标小区中用户信号窗之外的全部时域信号径作为干扰噪声窗;
处理模块,用于根据所述干扰噪声窗内的时域信号径进行噪声功率估计。
通过将目标小区中用户信号窗之外的全部时域信号径作为干扰噪声窗,提高了噪声功率估计的准确性。
较佳地,所述取窗模块,还用于根据下列方式确定用户信号窗:
根据当前接入到网络侧设备管理的所有小区中的用户设备的数量,以及最大信号窗口值,确定用户信号窗长度;以及
根据用户信号窗长度,在目标小区内选取用户信号窗。
较佳地,所述取窗模块选取的用户信号窗与特定小区的用户信号窗不包含相同的时域信号径;
其中,所述特定小区为所述目标小区的干扰小区,且由所述网络侧设备管理。
通过上述方式选取用户信号窗,能够防止目标小区的用户信号窗受到特定小区内的用户信号干扰。
较佳地,所述处理模块,具体用于:
将所述干扰噪声窗内的全部时域信号径的功率值的平均值,作为噪声功率值;或
将所述干扰噪声窗内小于阈值的时域信号径的功率值的平均值,作为噪声功率值;或
将所述干扰噪声窗内最小的N个时域信号径的功率值的平均值,作为噪声功率值,N为正整数。
较佳地,所述处理模块,还用于:
在根据所述干扰噪声窗内的时域信号径进行噪声功率估计之后,将进行噪声功率估计得到的噪声功率值作为进行信道估计时使用的有效时域信号径的门限值。
由于噪声功率值较为准确,将干扰噪声值直接作为作为确定有效时域信号径的门限值,能够防止在选取有效时域信号径时会漏掉部分真实的时域信号径,从而提高信道估计的准确性。
本发明实施例还提供了一种噪声功率估计的网络侧设备,该设备包括:
处理器,用于将目标小区中用户信号窗之外的全部时域信号径作为干扰噪声窗;以及根据干扰噪声窗内的时域信号径进行噪声功率估计;
收发机,用于在处理器的控制下接收和发送数据。
通过将目标小区中用户信号窗之外的全部时域信号径作为干扰噪声窗,提高了噪声功率估
计的准确性。
较佳地,处理器具体用于:
在确定UE需要进行自配置后,控制收发机向网络侧设备发送表示UE需要进行自配置的信息。
较佳地,处理器还用于根据下列方式确定用户信号窗:
根据当前接入到网络侧设备管理的所有小区中的用户设备的数量,以及最大信号窗口值,确定用户信号窗长度;以及
根据用户信号窗长度,在目标小区内选取用户信号窗。
较佳地,处理器选取的用户信号窗与特定小区的用户信号窗不包含相同的时域信号径;其中,特定小区为目标小区的干扰小区,且由同一个网络侧设备管理。
通过上述方式选取用户信号窗,能够防止目标小区的用户信号窗受到特定小区内的用户信号干扰。
较佳地,处理器具体用于:
将干扰噪声窗内的全部时域信号径的功率值的平均值,作为噪声功率值;或
将干扰噪声窗内小于阈值的时域信号径的功率值的平均值,作为噪声功率值;或
将干扰噪声窗内最小的N个时域信号径的功率值的平均值,作为噪声功率值,N为正整数。
较佳地,处理器还用于:
在根据干扰噪声窗内的时域信号径进行噪声功率估计之后,将进行噪声功率估计得到的噪声功率值作为进行信道估计时使用的有效时域信号径的门限值。
通过上述方式选取用户信号窗,能够防止目标小区的用户信号窗受到特定小区内的用户信号干扰。
由于噪声功率值较为准确,将干扰噪声值直接作为作为确定有效时域信号径的门限值,能够防止在选取有效时域信号径时会漏掉部分真实的时域信号径,从而提高信道估计的准确性。
图1为背景技术中信道估计方法的流程图;
图2为背景技术中进行噪声功率估计时选取的用户信号窗和干扰噪声窗的示意图;
图3为本申请实施例一提供的噪声功率估计的网络侧设备结构示意图;
图4为本申请实施例二提供的噪声功率估计的网络侧设备结构示意图;
图5为本申请实施例四提供的噪声功率估计方法的流程图;
图6为本申请实施例五提供的噪声功率估计方法的流程图;
图7为本申请实施例五中选取的用户信号窗和干扰噪声窗的示意图;
图8为本申请实施例六提供的噪声功率估计方法的流程图;
图9为本申请实施例六中选取的用户信号窗和干扰噪声窗的示意图;
图10为本申请实施例七提供的噪声功率估计方法的流程图;
图11为本申请实施例七中选取的用户信号窗和干扰噪声窗的示意图;
图12为本申请实施例八提供的信道估计方法的流程图;
图2、7、9、11中,X轴表示时域信道估计值对应的时域索引值,Y轴表示时域信道估计值。
为使本发明实施例的目的、技术方案和优点更加清楚,下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
应理解,本发明的技术方案可以应用于各种通信系统,例如:全球移动通讯(Global System of Mobile communication,GSM)系统、码分多址(Code Division Multiple Access,CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access,WCDMA)系统、通用分组无线业务(General Packet Radio Service,GPRS)、长期演进(Long Term Evolution,LTE)系统、先进的长期演进(Advanced long term evolution,LTE-A)系统、通用移动通信系统(Universal Mobile Telecommunication System,UMTS)等。
还应理解,在本发明实施例中,用户设备(User Equipment,UE)包括但不限于移动台(MS,Mobile Station)、移动终端(Mobile Terminal)、移动电话(Mobile Telephone)、手机(handset)及便携设备(portable equipment)等,该用户设备可以经无线接入网(Radio Access Network,RAN)与一个或多个核心网进行通信,例如,用户设备可以是移动电话(或称为“蜂窝”电话)、具有无线通信功能的计算机等,用户设备还可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置。
在本发明实施例中,基站(例如,接入点)可以是指接入网中在空中接口上通过一个或多个扇区与无线终端通信的设备。基站可用于将收到的空中帧与IP分组进行相互转换,作为无线终端与接入网的其余部分之间的路由器,其中接入网的其余部分可包括网际协议(IP)网络。基站还可协调对空中接口的属性管理。例如,基站可以是GSM或CDMA中的基站(Base Transceiver Station,BTS),也可以是WCDMA中的基站(NodeB),还可以是LTE中的演进型基站(NodeB或eNB或e-NodeB,evolutional Node B),本发明并不限定。
本实施例中,在选取干扰噪声窗时,将目标小区中用户信号窗之外的全部时域信号径作为干扰噪声窗,并根据干扰噪声窗内的时域信号径进行噪声功率估计。由于选取的干扰噪声窗的窗长较大,避免了因为干扰噪声窗只包含某个干扰小区信号而导致计算得到的干扰噪声功率比真实的干扰噪声功率偏大的问题,同时由于干扰噪声窗能够包含所有可能的特定干扰小区信号,从统计意义上准确度更高,因此估计得到的干扰噪声功率更加接近于真实的干扰噪声功率值,从而提高信道估计的准确性。
下面结合说明书附图对本申请实施例作进一步详细描述。
如图3所示,本申请实施例一的噪声功率估计的网络侧设备的结构,包括:
取窗模块300,用于将目标小区中用户信号窗之外的全部时域信号径作为干扰噪声窗;
处理模块310,用于根据干扰噪声窗内的时域信号径进行噪声功率估计。
其中,取窗模块300还用于根据下列方式确定用户信号窗:
根据当前接入到网络侧设备管理的所有小区中的用户设备的数量,以及最大信号窗口值,确定用户信号窗长度:
其中,Nuser,total当前接入到网络侧设备管理的所有小区中的用户设备的数量,这些小区的全部用户设备复用在相同物理资源块(Physical Resource Block,PRB)上,WLenRef表示最大信号窗口值,既可以根据网络侧设备测量的定时偏差和最大多径时延之和进行设置,也可以由网络侧设备进行预先配置,length(WinSig)表示用户信号窗长度,NPRB表示分配给用户的PRB个数值。本申请实施例中用户设备可使用的时域资源总数为12NPRB。
然后取窗模块300根据用户信号窗长度,在目标小区内选取用户信号窗。
选取用户信号窗WinSig和干扰噪声窗WinNoise可以采用如下方式:
用户信号窗:
WinSig=[-M1+α,M2+α-1]mod(12NPRB) (公式2);
干扰噪声窗:
WinNoise=[M2+α,M2+α+M3-1]mod(12NPRB) (公式3);
其中,α表示用户的解调参考信号(DeModulation Reference Signal,DMRS)符号的相位偏移,M1和M2分别表示用户信号窗的前窗和后窗大小,M3表示干扰噪声窗的窗长,M1、M2和M3的取值由网络侧设备直接配置,mod(·)表示取模运算。
由于本申请实施例中将目标小区中用户信号窗之外的全部时域信号径作为干扰噪声窗,因此M3在确定用户信号窗后自动确定,因此通过配置参数α、M1和M2可以确定用户信号窗和干扰噪声窗在时域上的位置。
较佳地,取窗模块选取的用户信号窗与特定小区的用户信号窗不包含相同的时域信号径;其中,特定小区为目标小区的干扰小区,且由同一个网络侧设备管理。由此能够避免目标小区的用户信号窗内还包含了特定小区内的其他用户的信号。
本申请实施例的网络侧设备可以是各类基站,比如宏基站、家庭基站等,也可以是中继节点(Relay Node,RN)设备,还可以是其它网络侧设备。
在选取干扰噪声窗之后,处理模块310可以采用多种方式对干扰噪声窗内的时域信号径进行噪声功率估计,以获取噪声功率值,具体可以包括但不限于以下几种方式:
方式一,将干扰噪声窗内的全部时域信号径的功率值的平均值,作为噪声功率值,具体处理方式如下:
记目标小区的干扰噪声窗内的时域信号径为h′i(i=0,1,…WLn-1),按下式计算干扰噪声功率PowerNI:
其中,real(·)和imag(·)分别表示实部和虚部。
方式二,将干扰噪声窗内小于阈值的时域信号径的功率值的平均值,作为噪声功率值。此种方式中,通过设置阈值来过滤过大的时域信号径的功率值,以避免获取的噪声功率值过大,具体处理方式如下:
记目标小区的干扰噪声窗内的时域信号径为h′i(i=0,1,…WLn-1),将每个时域信号径h′i(i=0,1,…WLn-1)与阈值h0进行比较,保留小于阈值h0的时域信号径,得到hi(i=0,1,…WLn-N′-1),然后按下式计算干扰噪声功率PowerNI:
其中,real(·)和imag(·)分别表示实部和虚部,N’表示与阈值比较后排除的时域信号径数量,N’为非负整数。
方式三,将干扰噪声窗内最小的N个时域信号径的功率值的平均值,作为噪声功率值,其中N为正整数。一般情况下,N可以设置为干扰噪声窗内时域信号径总数的一半,而当时域信号径样本总数较少时,也可以将N设置为超过干扰噪声窗内时域信号径总数的一半的正整数,以提高噪声功率值的准确性。具体处理方式如下:
记目标小区的干扰噪声窗内的时域信号径为h′i(i=0,1,…WLn-1),对干扰噪声窗的时域信号径按照功率从小到大进行排序:hi=sort(h′i),其中,sort(·)表示从小到大进行排序。
选取最小的N个时域信号径,并按下式计算干扰噪声功率PowerNI:
其中,real(·)和imag(·)分别表示实部和虚部,N为正整数。
此外,处理模块310,还用于:
在根据干扰噪声窗内的时域信号径进行噪声功率估计之后,将进行噪声功率估计得到的噪声功率值作为进行信道估计时使用的有效时域信号径的门限值。
如图4所示,本申请实施例二的噪声功率估计的网络侧设备的结构,包括:
处理器400,用于将目标小区中用户信号窗之外的全部时域信号径作为干扰噪声窗;以及根据干扰噪声窗内的时域信号径进行噪声功率估计;
收发机410,用于在处理器400的控制下接收和发送数据。
较佳地,处理器400具体用于:
在确定UE需要进行自配置后,控制收发机410向网络侧设备发送表示UE需要进行自配置的信息。
较佳地,处理器400还用于根据下列方式确定用户信号窗:
根据当前接入到网络侧设备管理的所有小区中的用户设备的数量,以及最大信号窗口值,确定用户信号窗长度;以及
根据用户信号窗长度,在目标小区内选取用户信号窗。
较佳地,处理器400选取的用户信号窗与特定小区的用户信号窗不包含相同的时域信号径;其中,特定小区为目标小区的干扰小区,且由同一个网络侧设备管理。
较佳地,处理器400具体用于:
将干扰噪声窗内的全部时域信号径的功率值的平均值,作为噪声功率值;或
将干扰噪声窗内小于阈值的时域信号径的功率值的平均值,作为噪声功率值;或
将干扰噪声窗内最小的N个时域信号径的功率值的平均值,作为噪声功率值,N为正整数。
较佳地,处理器400还用于:
在根据干扰噪声窗内的时域信号径进行噪声功率估计之后,将进行噪声功率估计得到的噪声功率值作为进行信道估计时使用的有效时域信号径的门限值。
其中,在图4中,总线构架可以包括任意数量的互联的总线和桥,具体由处理器400代表的一个或多个处理器和存储器420代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起,这些都是本领域所公知的,因此,本文不再对其进行进一步描述。总线接口提供接口。收发机410可以是多个元件,即包括发送机和接收机,提供用于在传输介质上与各种其他装置通信的
单元。处理器400负责管理总线架构和通常的处理,存储器420可以存储处理器400在执行操作时所使用的数据。
处理器400负责管理总线架构和通常的处理,存储器420可以存储处理器400在执行操作时所使用的数据。
本申请实施例三还提供一种信道估计系统,该系统包括了实施例一和实施例二中所提及的任意一种噪声功率估计的网络侧设备。信道估计系统内的噪声功率估计的网络侧设备在处理得到噪声功率值之后,将其作为进行信道估计时使用的有效时域信号径的门限值,再由信道估计系统根据门限值进行信道估计。其中,信道估计系统根据门限值进行信道估计的具体处理方式包括但不限于背景技术中所提及的方式,可以采用其他任何适用的现有技术。
由于优化了获取噪声功率值的方式,因此选取有效时域信号径时的门限值相对于现有技术较为准确,能够减少在选取有效时域信号径时会漏掉部分真实的时域信号径的可能性,提高信道估计的准确性。
基于同一发明构思,本申请实施例中还分别提供了一种噪声估计方法以及信道估计方法,由于这些方法对应的设备是本申请实施例中噪声估计的网络侧设备和信道估计系统,并且该方法解决问题的原理与设备相似,因此该方法的实施可以参见设备中对应的实施,重复之处不再赘述。
如图5所示,本发明实施例四提供的噪声功率估计方法,包括:
步骤501,网络侧设备将目标小区中用户信号窗之外的全部时域信号径作为干扰噪声窗。
步骤502,网络侧设备根据干扰噪声窗内的时域信号径进行噪声功率估计。
较佳地,网络侧设备根据下列方式确定用户信号窗:
网络侧设备根据当前接入到网络侧设备管理的所有小区中的用户设备的数量,以及最大信号窗口值,确定用户信号窗长度;
网络侧设备根据用户信号窗长度,在目标小区内选取用户信号窗。
较佳地,网络侧设备选取的用户信号窗与特定小区的用户信号窗不包含相同的时域信号径;其中,特定小区为目标小区的干扰小区,且由网络侧设备管理。
较佳地,根据干扰噪声窗内的时域信号径进行噪声功率估计,包括:
将干扰噪声窗内的全部时域信号径的功率值的平均值,作为噪声功率值;或
将干扰噪声窗内小于阈值的时域信号径的功率值的平均值,作为噪声功率值;或
将干扰噪声窗内最小的N个时域信号径的功率值的平均值,作为噪声功率值,N为正整数。
较佳地,网络侧设备根据干扰噪声窗内的时域信号径进行噪声功率估计之后,还包括:
网络侧设备将进行噪声功率估计得到的噪声功率值作为进行信道估计时使用的有效时域信号径的门限值。
如图6所示,本发明实施例五提供的噪声功率估计方法,包括:
步骤601,网络侧设备根据当前接入到网络侧设备管理的所有小区中的用户设备的数量Nuser,total,以及最大信号窗口值WLenRef,采用公式1确定用户信号窗长度length(WinSig)。
本实施例中,网络侧设备管理下的小区为3个,Nuser,total=6,WLenRef预先设置为3NPRB,
由此确定用户信号窗长度为2NPRB。
步骤602,网络侧设备根据用户信号窗长度,在目标小区内选取用户信号窗。具体实施时,可以根据公式2通过设定适当的参数α、M1和M2选取用户信号窗。在选取用户信号窗时,使得同一小区内两个用户信号窗在时域上的间距最大,以保证选取的用户信号窗与特定小区的用户信号窗不包含相同的时域信号径。其中,特定小区为目标小区的干扰小区,且由同一网络侧设备管理。
本实施例中最终选取的用户信号窗如下:
小区1中:用户1的用户信号窗占用[0,2NPRB-1],用户2的用户信号窗占用[2NPRB,8NPRB-1];
小区2中,用户1的用户信号窗占用[2NPRB,4NPRB-1],用户2的用户信号窗占用[8NPRB,10NPRB-1];
小区3中,用户1的用户信号窗占用[4NPRB,6NPRB-1],用户2的用户信号窗占用[10NPRB,12NPRB-1]。
本申请的实施例中,用户信号窗的编号从0开始,[0,2NPRB-1]表示编号从0至2NPRB-1的2NPRB条时域信号径。
步骤603,网络侧设备将目标小区中用户信号窗之外的全部时域信号径作为干扰噪声窗:
小区1中,干扰噪声窗WinNoise,cell1占用[2NPRB,6NPRB-1]∪[8NPRB,12NPRB-1],窗长为WLn=length(WinNoise,cell1)=8NPRB;
小区2中,干扰噪声窗WinNoise,cell2占用[0,2NPRB-1]∪[4NPRB,8NPRB-1]∪[10NPRB,12NPRB-1],窗长为WLn=length(WinNoise,cell2)=8NPRB;
小区3中,干扰噪声窗WinNoise,cell3占用[0,4NPRB-1]∪[6NPRB,10NPRB-1],窗长为WLn=length(WinNoise,cell3)=8NPRB;
至此,本实施例选取的用户信号窗和干扰噪声窗如图7所示。
步骤604,将干扰噪声窗内的全部时域信号径的功率值的平均值,作为噪声功率值。
以小区1作为目标小区,记干扰噪声窗内的时域信号径为h′i(i=0,1,…WLn-1),按下式计算干扰噪声功率PowerNI:
其中,real(·)和imag(·)分别表示实部和虚部。
如图8所示,本发明实施例六提供的噪声功率估计方法,包括:
步骤801,网络侧设备根据当前接入到网络侧设备管理的所有小区中的用户设备的数量Nuser,total,以及最大信号窗口值WLenRef,采用公式1确定用户信号窗长度length(WinSig)。
本实施例中,网络侧设备管理下的小区为2个,Nuser,total=4,WLenRef预先设置为3NPRB,
由此确定用户信号窗长度为3NPRB。
步骤802,网络侧设备根据用户信号窗长度,在目标小区内选取用户信号窗。具体实施时,可以根据公式2通过设定适当的参数α、M1和M2选取用户信号窗。在选取用户信号窗时,使得同一小区内两个用户信号窗在时域上的间距最大,以保证选取的用户信号窗与特定小区的用户信号窗不包含相同的时域信号径。其中,特定小区为目标小区的干扰小区,且由同一网络侧设备管理。
本实施例中最终选取的用户信号窗如下:
小区1中:用户1的用户信号窗占用[0,3NPRB-1],用户2的用户信号窗占用[6NPRB,9NPRB-1];
小区2中,用户1的用户信号窗占用[3NPRB,6NPRB-1],用户2的用户信号窗占用[9NPRB,12NPRB-1];
步骤803,网络侧设备将目标小区中用户信号窗之外的全部时域信号径作为干扰噪声窗:
小区1中,干扰噪声窗WinNoise,cell1占用[3NPRB,6NPRB-1]∪[9NPRB,12NPRB-1],窗长为WLn=length(WinNoise,cell1)=6NPRB;
小区2中,干扰噪声窗WinNoise,cell2占用[0,3NPRB-1]∪[9NPRB,12NPRB-1],窗长为WLn=length(WinNoise,cell2)=6NPRB;
至此,本实施例选取的用户信号窗和干扰噪声窗如图9所示。
步骤804,将干扰噪声窗内小于阈值的时域信号径的功率值的平均值,作为噪声功率值。
以小区1作为目标小区,记干扰噪声窗内的时域信号径为h′i(i=0,1,…WLn-1),将每个时域信号径h′i(i=0,1,…WLn-1)与阈值h0进行比较,保留小于阈值h0的时域信号径,得到hi(i=0,1,…WLn-N′-1),然后按下式计算干扰噪声功率PowerNI:
其中,real(·)和imag(·)分别表示实部和虚部,N’表示与阈值比较后排除的时域信号径数量,N’为非负整数。
如图10所示,本发明实施例七提供的噪声功率估计方法,包括:
步骤1001,网络侧设备根据当前接入到网络侧设备管理的所有小区中的用户设备的数量Nuser,total,以及最大信号窗口值WLenRef,采用公式1确定用户信号窗长度length(WinSig)。
本实施例中,网络侧设备管理下的小区为2个,Nuser,total=4,WLenRef预先设置为3NPRB,
由此确定用户信号窗长度为3NPRB。
步骤1002,网络侧设备根据用户信号窗长度,在目标小区内选取用户信号窗。具体实施时,可以根据公式2通过设定适当的参数α、M1和M2选取用户信号窗。在选取用户信号窗时,使得同一小区内两个用户信号窗在时域上的间距最大,以保证选取的用户信号窗与特定小区的用户信号窗不包含相同的时域信号径。其中,特定小区为目标小区的干扰小区,且由网络侧设备管理。
本实施例中最终选取的用户信号窗如下:
小区1中,用户1的用户信号窗占用[0,2NPRB-1]∪[11NPRB,12NPRB-1],用户2的用户信号窗占用[5NPRB,8NPRB-1];
小区2中,用户1的用户信号窗占用[2NPRB,5NPRB-1],用户2的用户信号窗占用[8NPRB,11NPRB-1];
步骤1003,网络侧设备将目标小区中用户信号窗之外的全部时域信号径作为干扰噪声窗:
小区1中,干扰噪声窗WinNoise,cell1占用[2NPRB,5NPRB-1]∪[8NPRB,11NPRB-1],窗长为
WLn=length(WinNoise,cell1)=6NPRB;
小区2中,干扰噪声窗WinNoise,cell2占用[0,2NPRB-1]∪[5NPRB,8NPRB-1]∪[11NPRB,12NPRB-1],窗长为WLn=length(WinNoise,cell2)=6NPRB;
至此,本实施例选取的用户信号窗和干扰噪声窗如图11所示。
步骤1004,将干扰噪声窗内最小的N个时域信号径的功率值的平均值,作为噪声功率值。
以小区1作为目标小区,记干扰噪声窗内的时域信号径为h′i(i=0,1,…WLn-1),对干扰噪声窗的时域信号径按照功率从小到大进行排序:hi=sort(h′i),其中,sort(·)表示从小到大进行排序。
选取最小的N个时域信号径,并按下式计算干扰噪声功率PowerNI:
其中,real(·)和imag(·)分别表示实部和虚部,N为正整数。
如图12所示,本发明实施例八提供的信道估计方法,该方法采用本申请实施例提供的任意一种噪声功率估计方法获取噪声功率值,并根据获取的噪声功率值进行信道估计,具体步骤如下:
本步骤中采用的信号模型为LTE上行SIMO的频域等效接收信道模型:
YP=diag{XP}HP+WP
YP表示接收导频信号矢量,XP表示发送导频信号矢量,HP表示频域信道响应矢量,WP表示接收噪声矢量,diag{XP}表示以XP的元素为主对角线元素的对角矩阵。
其中,FH表示归一化的IDFT矩阵。
步骤1203步骤具体包括:
步骤12031,采用本申请实施例提供的任意一种噪声功率估计方法获取噪声功率值。
步骤12032,直接将噪声功率值作为确定有效时域信号径的门限值TH;
作为一种可替换的方式,本步骤也可以采用现有技术中根据用户信号窗内的最强时域信号径和噪声功率值共同确定有效时域信号径的门限值TH的方式:
TH=min(β·PowerNI,γ·Ph,max)
步骤12033,根据门限值筛选用户信号窗内需要保留的时域信号径,将不需要保留的时域信号径置零:
步骤12034,将噪声窗内的时域信号径置零,得到抑噪后的时域信道估计序列h′P(n):
其中,WinSig表示用户信号窗,WinNoise表示干扰噪声窗。
步骤1204,对抑噪后的时域信道估计序列进行DFT,得到导频符号的频域信道估计值H′P:
其中,F表示归一化的DFT矩阵。
步骤1205,对导频符号的频域信道估计值进行时域线性插值,得到数据符号的频域信道估计值H′Data,具体插值算法可以采用LS或者MMSE线性插值算法。
从上述内容可以看出:本申请实施例在选取干扰噪声窗时,将目标小区中用户信号窗之外的全部时域信号径作为干扰噪声窗,能够提高干扰噪声值的估计准确性,同时通过调整干扰噪声值估计的算法进一步提高了准确性,并且在信道估计时将干扰噪声值直接作为确定有效时域信号径的门限值,使得信道估计的准确性也得到提高。此外,通过优化选取用户信号窗的方案,防止了目标小区的用户信号窗受到特定小区内的用户信号干扰,进一步提高了信道估计的准确性。
本领域内的技术人员应明白,本发明的实施例可提供为方法、系统、或计算机程序产品。因此,本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且,本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图
和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器,使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中,使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品,该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上,使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理,从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例,但本领域内的技术人员一旦得知了基本创造性概念,则可对这些实施例作出另外的变更和修改。所以,所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然,本领域的技术人员可以对本发明实施例进行各种改动和变型而不脱离本发明实施例的精神和范围。这样,倘若本发明实施例的这些修改和变型属于本发明权利要求及其等同技术的范围之内,则本发明也意图包含这些改动和变型在内。
Claims (10)
- 一种噪声功率估计方法,其特征在于,该方法包括:网络侧设备将目标小区中用户信号窗之外的全部时域信号径作为干扰噪声窗;所述网络侧设备根据所述干扰噪声窗内的时域信号径进行噪声功率估计。
- 如权利要求1所述的方法,其特征在于,所述网络侧设备根据下列方式确定用户信号窗:所述网络侧设备根据当前接入到所述网络侧设备管理的所有小区中的复用在相同PRB上的用户设备的数量,以及最大信号窗口值,确定用户信号窗长度;所述网络侧设备根据用户信号窗长度,在目标小区内选取用户信号窗。
- 如权利要求2所述的方法,其特征在于,所述网络侧设备选取的用户信号窗与特定小区的用户信号窗不包含相同的时域信号径;其中,所述特定小区为所述目标小区的干扰小区,且由所述网络侧设备管理。
- 如权利要求1所述的方法,其特征在于,所述根据所述干扰噪声窗内的时域信号径进行噪声功率估计,包括:将所述干扰噪声窗内的全部时域信号径的功率值的平均值,作为噪声功率值;或将所述干扰噪声窗内小于阈值的时域信号径的功率值的平均值,作为噪声功率值;或将所述干扰噪声窗内最小的N个时域信号径的功率值的平均值,作为噪声功率值,N为正整数。
- 如权利要求1~4任一所述的方法,其特征在于,所述网络侧设备根据所述干扰噪声窗内的时域信号径进行噪声功率估计之后,还包括:所述网络侧设备将进行噪声功率估计得到的噪声功率值作为进行信道估计时使用的有效时域信号径的门限值。
- 一种噪声功率估计的网络侧设备,其特征在于,该设备包括:取窗模块,用于将目标小区中用户信号窗之外的全部时域信号径作为干扰噪声窗;处理模块,用于根据所述干扰噪声窗内的时域信号径进行噪声功率估计。
- 如权利要求6所述的设备,其特征在于,所述取窗模块,还用于根据下列方式确定用户信号窗:根据当前接入到网络侧设备管理的所有小区中的用户设备的数量,以及最大信号窗口值,确定用户信号窗长度;以及根据用户信号窗长度,在目标小区内选取用户信号窗。
- 如权利要求7所述的设备,其特征在于,所述取窗模块选取的用户信号窗与特定小区的用户信号窗不包含相同的时域信号径;其中,所述特定小区为所述目标小区的干扰小区,且由所述网络侧设备管理。
- 如权利要求6所述的设备,其特征在于,所述处理模块,具体用于:将所述干扰噪声窗内的全部时域信号径的功率值的平均值,作为噪声功率值;或将所述干扰噪声窗内小于阈值的时域信号径的功率值的平均值,作为噪声功率值;或将所述干扰噪声窗内最小的N个时域信号径的功率值的平均值,作为噪声功率值,N为正整数。
- 如权利要求6~9任一所述的设备,其特征在于,所述处理模块,还用于:在根据所述干扰噪声窗内的时域信号径进行噪声功率估计之后,将进行噪声功率估计得到的噪声功率值作为进行信道估计时使用的有效时域信号径的门限值。
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| CN112910582B (zh) * | 2021-02-01 | 2022-08-02 | 成都爱瑞无线科技有限公司 | 一种多发送端口模式下的噪声与干扰功率估计方法 |
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