CN107332798B - Terminal demodulation method and device for L TE system - Google Patents
Terminal demodulation method and device for L TE system Download PDFInfo
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- CN107332798B CN107332798B CN201610282142.0A CN201610282142A CN107332798B CN 107332798 B CN107332798 B CN 107332798B CN 201610282142 A CN201610282142 A CN 201610282142A CN 107332798 B CN107332798 B CN 107332798B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0012—Modulated-carrier systems arrangements for identifying the type of modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
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Abstract
A terminal demodulation method and a terminal demodulation device of an L TE system are provided, the method comprises the steps of determining a working mode of each functional module of a receiver based on a working scene of the receiver for each received subframe data, wherein a preset corresponding relation exists between the working scene and the working mode of each functional module, determining a working parameter of each functional module according to the respective working mode of each functional module, calculating by each functional module according to the working parameter, and using the result obtained by calculation for terminal demodulation.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a terminal demodulation method and apparatus for an L TE system.
Background
For terminal demodulation of a long Term Evolution (L ong Term Evolution, L TE) system, the terminal generally calls a functional module of the system to perform calculation once when receiving one subframe data, and updates system parameters according to a calculation result.
L TE standard defines Discontinuous Reception (DRX) technology, when a terminal configures DRX function, the terminal only needs to turn on the receiver at some specific time to enter active state to demodulate data, and at other time, the terminal enters sleep period and the receiver turns off each function module.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a terminal demodulation method and apparatus for L TE system, so as to improve the demodulation performance of the terminal.
In order to solve the foregoing technical problem, an embodiment of the present invention provides a terminal demodulation method for an L TE system, where the method includes:
for each received subframe data, determining a working mode of each functional module of the receiver based on a working scene of the receiver, wherein a preset corresponding relation exists between the working scene and the working mode of each functional module; determining the working parameters of each functional module according to the respective working mode of each functional module; and each functional module carries out operation according to the working parameters and uses the result obtained by operation for terminal demodulation.
Optionally, the division of the work scenario is related to factors affecting the operation of the L TE system.
Optionally, the factors include one or more of a system configuration of the L TE system, an operating environment in which the L TE system is located, and attributes of demodulated data carried by the subframe data.
Optionally, different functional modules have different modes of operation.
Optionally, the terminal is configured as a terminal supporting continuous reception and/or discontinuous reception.
Optionally, the functional module comprises one or more of: the device comprises a channel estimation module, a frequency offset estimation module, a timing synchronization module, a noise estimation module, a Doppler estimation module, a blank subframe estimation module, an interference estimation module and an automatic gain measurement and control module.
The embodiment of the invention also provides a terminal demodulation device of L TE system, the device includes:
the working mode determining unit is suitable for determining the working mode of each functional module of the receiver based on the working scene of the receiver for each received subframe data, wherein a preset corresponding relation exists between the working scene and the working mode of each functional module;
the working parameter determining unit is suitable for determining the working parameters of each functional module according to the respective working mode of each functional module;
and the operation unit is suitable for enabling each functional module to perform operation according to the working parameters and using the result obtained by operation for terminal demodulation.
Optionally, the division of the work scenario is related to factors affecting the operation of the L TE system.
Optionally, the factors include one or more of a system configuration of the L TE system, optionally, different functional modules having different modes of operation.
Optionally, the terminal is configured as a terminal supporting continuous reception and/or discontinuous reception.
Optionally, the functional module comprises one or more of: the device comprises a channel estimation module, a frequency offset estimation module, a timing synchronization module, a noise estimation module, a Doppler estimation module, a blank subframe estimation module, an interference estimation module and an automatic gain measurement and control module.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
according to the technical scheme of the embodiment of the invention, for each received subframe data, the working mode of each functional module of the receiver is determined based on the working scene of the receiver, the working parameter of each functional module is determined according to the respective working mode of each functional module, each functional module carries out operation according to the working parameter, and the result obtained by the operation is used for terminal demodulation. In the process, different working scenes, working modes and corresponding relations among the working parameters are preset, and when the working scenes change, the corresponding working modes and the corresponding working parameters are also adaptively adjusted and changed, so that each functional module of the receiver can calculate according to the adjusted working parameters.
Drawings
Fig. 1 is a flowchart of a terminal demodulation method of an L TE system in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a terminal demodulation apparatus of an L TE system in an embodiment of the present invention.
Detailed Description
As background art, L TE standard defines Discontinuous Reception (DRX) technology, when a terminal configures DRX function, the terminal only needs to turn on a receiver at some specific time to enter an active state to demodulate data, and at other time, the terminal enters a sleep period and the receiver turns off each functional module.
The inventor of the present application has found that when the terminal enters the sleep period, the receiver turns off the functional modules of each system, the channel condition may change to a certain extent, and the timing, frequency, and the like of the terminal may change to a certain extent with the changes of time and temperature. However, when the terminal enters the active state after undergoing the sleep period, if the operating mode of each functional module is always unchanged and each functional module still uses the original operating parameters for operation and demodulation, the demodulation accuracy is low and the demodulation performance is poor.
According to the embodiment of the invention, for each received subframe data, the working mode of each functional module of the receiver is determined based on the working scene of the receiver, the working parameter of each functional module is determined according to the respective working mode of each functional module, each functional module carries out operation according to the working parameter, and the result obtained by the operation is used for terminal demodulation. In the process, different working scenes, working modes and corresponding relations among the working parameters are preset, and when the working scenes change, the corresponding working modes and working parameters are adaptively adjusted and changed, so that each functional module of the receiver can calculate according to the adjusted working parameters, and then the result obtained by calculation is used for improving the demodulation accuracy after demodulation, thereby improving the demodulation performance.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a flowchart of a terminal demodulation method of an L TE system in an embodiment of the present invention, and the following description refers to the steps shown in fig. 1.
Step S101: and for each received subframe data, determining the working mode of each functional module of the receiver based on the working scene of the receiver, wherein a preset corresponding relation exists between the working scene and the working mode of each functional module.
Under the same working scene, the data processed by the system often have basically the same characteristics. For example, in a static state, a data transmission channel is stable, and data transmission has the characteristics of very small time delay and the like; for another example, in a working scene of high-speed movement such as a high-speed rail, a system channel changes violently, signal delay and phase difference at different times are large, noise fluctuation is violent, and the like.
In particular implementation, the division of the working scene is related to factors influencing the operation of the L TE system, wherein the factors comprise one or more of the system configuration of the L TE system, the working environment of the L TE system and the property of the demodulated data carried by the subframe data.
The following is an example. The system configuration can be, for example, an FDD or TDD operating mode, a DRX mode with a long sleep cycle, a DRX mode with a short sleep cycle, or the like; the working environment may include, for example, a static state or a high-speed moving state; the attribute of the demodulated data may include, for example, that the demodulated data carried by the subframe data is located on a TDD downlink subframe, the length of the demodulated data is one or more subframes, and the like.
It should be noted that the working scenario may be divided and defined differently according to the needs, and is not limited herein.
In particular implementations, the functional modules may include one or more of: the device comprises a channel estimation module, a frequency offset estimation module, a timing synchronization module, a noise estimation module, a Doppler estimation module, a blank subframe estimation module, an interference estimation module and an automatic gain measurement and control module. It should be noted that the actual design may not be limited to the above-listed functional modules.
In specific implementation, different functional modules have corresponding different working modes, so that one of the different working modes can be selected for presetting. The operating mode is related to the applied operating method.
Specifically, the operation mode of the channel estimation module may include a single frame mode and a previous and next frame smoothing mode; the working mode of the frequency offset estimation module can comprise resetting, adopting a large frequency offset algorithm and adopting a small frequency offset algorithm; the working mode of the timing synchronization module can comprise a coarse timing deviation algorithm and a fine timing deviation algorithm; the working modes of the noise estimation module can comprise a single-point mode, an intra-frame smoothing mode and an inter-frame smoothing mode; the working modes of the Doppler estimation module can comprise a half frame mode and a full frame mode; the operating mode of the automatic gain measurement and control module may include an on mode.
In a specific implementation, the preset operation mode of each functional module may further include a shutdown mode, that is, it is characterized that data is not demodulated in the current subframe.
For a specific working scene, each functional module can select one of the working modes for presetting. For example, for the frequency offset estimation module, it may be preset in an operating scenario 1, where the operating scenario 1 assumes that the TDD system and the sleep time are long (e.g., greater than 20ms), the reset is performed on the 0 th frame, a large frequency offset algorithm is used on the 1 st frame, and a small frequency offset algorithm is used on the 2 nd frame. Therefore, if the current situation is in the working scene 1, the working mode of the frequency offset estimation module on the 0 th frame is determined to be reset, the working mode of the frequency offset estimation module on the 1 st frame is determined to adopt a large frequency offset algorithm, and the working mode of the frequency offset estimation module on the 2 nd frame is determined to adopt a small frequency offset algorithm.
Continuing to explain along the above example, the frequency offset estimation module is respectively set to reset, a large frequency offset estimation algorithm (having a large estimation range and coarse estimation precision) and a small frequency offset estimation algorithm (having a smaller estimation range but a shorter estimation precision) in the working modes of the 0 th frame, the 1 st frame and the 2 nd frame, so that the precision of frequency offset estimation can be further improved on the basis of completing the large frequency offset estimation, and further, the frequency offset estimation module can adapt to a TDD system and a long-sleep-time working scenario, so that the demodulation accuracy can be improved after the operation result of the frequency offset estimation module is used for terminal demodulation.
For another example, in the working scenario 2, it is assumed that the working scenario 2 is an FDD system and the sleep time length is short (e.g. less than 5ms), the frequency offset estimation module does not need to calibrate the system in advance, and may preset the working mode on the subframe 0 as off (i.e. not demodulating), preset the working mode on the subframe 1 and the subframe 2 as demodulation after performing operation by using the small frequency offset algorithm, and preset the working mode on the subframe 3 as reset.
By analogy, the working modes of other functional modules in a specific working scene can also be preset as required, and are not described in detail.
By presetting the working mode of the functional module in a specific working scene, when the functional module is in the specific working scene, the corresponding working mode can be determined according to the presetting. Thus, an operation mode sequence is formed on the continuous subframe periods, so that the specific operation scene can be adapted.
Step S102: and determining the working parameters of each functional module according to the respective working mode of each functional module.
The operating modes and the corresponding operating parameters are correspondingly preset in advance. After the step S101, the working mode is set according to the corresponding relationship between the preset working scene and the working mode, and then the working parameters of the functional module in the working mode are further determined. The working parameters may be parameters required by the operation method corresponding to the working mode.
For example, the operating parameters of the channel estimation module in the previous and subsequent frame smoothing mode may include smoothing filter coefficients, smoothing length, etc.; the timing synchronization module adopts the timing deviation needed by the timing deviation algorithm to estimate the step length and the like; the noise estimation module calculates the required smoothing length, smoothing filter coefficients and the like in a smoothing mode.
Step S103: and each functional module carries out operation according to the working parameters and uses the result obtained by operation for terminal demodulation.
The working mode and the working parameters under a specific working scene are determined through the step S102 and the step S103, so that each functional module can perform independent operation by using the corresponding operation method and the corresponding working parameters, and the result obtained by the operation is used for the demodulation of the terminal.
According to the embodiment of the invention, the working mode of each functional module of the receiver is determined based on the working scene of the receiver for each received subframe data, the working parameter of each functional module is determined according to the respective working mode of each functional module, each functional module carries out operation according to the working parameter, and the result obtained by the operation is used for terminal demodulation. In the process, different working scenes, working modes and corresponding relations among the working parameters are preset, and when the working scenes change, the corresponding working modes and the working parameters are also adaptively adjusted and changed, so that each functional module of the receiver can calculate according to the adjusted working parameters, and then the calculated result is used for improving the demodulation accuracy after demodulation, and when the terminal is configured to receive discontinuously, even if the working scenes change, better demodulation performance can be adaptively obtained.
It can be understood that, in the embodiment of the present invention, when a working scene changes, the working mode and the working parameters may be adaptively determined again, and then, for the configuration of the terminal as continuous reception, the situation that the working mode does not need to change may also be applied.
Fig. 2 is a schematic structural diagram of a terminal demodulation device of an L TE system in an embodiment of the present invention, the terminal demodulation device of the L TE system shown in fig. 2 may include:
the working mode determining unit 201 is adapted to determine, for each received subframe data, a working mode of each functional module of the receiver based on a working scenario of the receiver, where a preset correspondence exists between the working scenario and the working mode of each functional module;
an operating parameter determining unit 202, adapted to determine an operating parameter of each functional module according to the respective operating mode of each functional module;
and the operation unit 203 is suitable for enabling each functional module to perform operation according to the working parameters, and using the result obtained by operation for terminal demodulation.
In a specific implementation, the division of the work scenario is related to factors that affect the operation of the L TE system.
In particular implementations, the factors include one or more of a system configuration of the L TE system, an operating environment in which the L TE system is located, and attributes of demodulated data carried by the subframe data.
In specific implementation, different functional modules have different working modes, so that one of the functional modules can be selected for presetting.
In a particular implementation, the terminal is configured as a terminal supporting continuous reception and/or discontinuous reception.
In a specific implementation, the functional modules include one or more of: the device comprises a channel estimation module, a frequency offset estimation module, a timing synchronization module, a noise estimation module, a Doppler estimation module, a blank subframe estimation module, an interference estimation module and an automatic gain measurement and control module.
The description of the terminal demodulation apparatus corresponding to the L TE system may refer to the terminal demodulation method of the L TE system, and is not repeated herein.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by instructions associated with hardware via a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
The method and system of the embodiments of the present invention have been described in detail, but the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (12)
1. A terminal demodulation method of L TE system, comprising:
for each received subframe data, determining the working mode of each functional module of the receiver based on the working scene of the receiver, and forming a working mode sequence on continuous subframe periods to adapt to a specific working scene, wherein a preset corresponding relation exists between the working scene and the working mode of each functional module;
determining the working parameters of each functional module according to the respective working mode of each functional module;
and each functional module carries out operation according to the working parameters and uses the result obtained by operation for terminal demodulation.
2. The terminal demodulation method of L TE system according to claim 1, wherein said division of operation scene is related to factors affecting the operation of said L TE system.
3. The terminal demodulation method of L TE system according to claim 2, wherein the factors include one or more of system configuration of the L TE system, operating environment of the L TE system and attributes of demodulated data carried by the sub-frame data.
4. The terminal demodulation method of L TE system according to claim 1, wherein different function modules have different operation modes.
5. L TE system terminal demodulation method according to any of claims 1-4, characterized in that the terminal is configured as a terminal supporting continuous reception and/or discontinuous reception.
6. The terminal demodulation method L TE system according to any one of claims 1-4, wherein the functional modules include one or more of a channel estimation module, a frequency offset estimation module, a timing synchronization module, a noise estimation module, a Doppler estimation module, a blank subframe estimation module, an interference estimation module and an automatic gain measurement and control module.
7. A terminal demodulation apparatus of L TE system, comprising:
the working mode determining unit is suitable for determining the working mode of each functional module of the receiver based on the working scene of the receiver for each received subframe data, and forming a working mode sequence on continuous subframe periods to adapt to a specific working scene, wherein a preset corresponding relation exists between the working scene and the working mode of each functional module;
the working parameter determining unit is suitable for determining the working parameters of each functional module according to the respective working mode of each functional module;
and the operation unit is suitable for enabling each functional module to perform operation according to the working parameters and using the result obtained by operation for terminal demodulation.
8. The terminal demodulation device of L TE system of claim 7, wherein said division of operation scene relates to factors affecting the operation of said L TE system.
9. The terminal demodulation device of L TE system according to claim 8, wherein the factors include one or more of system configuration of the L TE system, operating environment of the L TE system and properties of demodulated data carried by the sub-frame data.
10. The terminal demodulation apparatus L TE system according to claim 7, wherein different functional modules have different operation modes.
11. L TE system terminal demodulation apparatus according to any of claims 7-10, characterized in that, the terminal is configured as a terminal supporting continuous reception and/or discontinuous reception.
12. The terminal demodulation apparatus L TE system according to any of claims 7-10, wherein the function modules include one or more of a channel estimation module, a frequency offset estimation module, a timing synchronization module, a noise estimation module, a Doppler estimation module, a blank subframe estimation module, an interference estimation module and an automatic gain measurement and control module.
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