CN114760177B - Data receiving method in multipoint-to-point system and related equipment - Google Patents
Data receiving method in multipoint-to-point system and related equipment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation
Abstract
The application provides a data receiving method, a device, electronic equipment and a storage medium in a multipoint-to-point system. The method comprises the following steps: receiving and buffering OFDM signals transmitted based on a certain number of sub-channels; respectively determining corresponding channel characteristics for the sub-channels according to the reference signals of the sub-channels; dividing all the subchannels into at least two subchannel sets; wherein each of said sub-channel groups comprises at least one of said sub-channels; and sequentially carrying out demodulation processing on the sub-channel groups according to a preset sequence based on the OFDM signals so as to obtain data transmitted by the sub-channels included in the corresponding sub-channel groups after each demodulation processing. The scheme of the application can effectively avoid ICI, ISI and masking effect problems in the data receiving process of the multipoint-to-point system, and improves the performance of a receiver.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a data receiving method and apparatus in a multipoint-to-point system, an electronic device, and a storage medium.
Background
Currently, wireless communication systems based on orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) technology are widely used in daily life. In some application scenarios, a receiver of the OFDM system needs to receive data sent by multiple users on different Sub-channels (Sub-channels) simultaneously in a Channel BandWidth (CBW; for 5G, BWP may be used. An OFDM system with the above characteristics is a so-called multipoint-to-point (N-to-1) system.
For the multipoint-to-point system in the related art, serious Inter-carrier interference (Inter-Carrier Interference, ICI), inter-symbol interference (Inter-Symbol Interference, ISI) and masking effects generally exist, which affect the quality of data transmission.
Disclosure of Invention
In view of the foregoing, an object of the present application is to provide a data receiving method, apparatus, electronic device and storage medium in a multipoint-to-point system.
Based on the above objects, the present application provides a data receiving method in a multipoint-to-point system, including:
receiving and buffering OFDM signals transmitted based on a certain number of sub-channels;
respectively determining corresponding channel characteristics for the sub-channels according to the reference signals of the sub-channels;
dividing all the subchannels into at least two subchannel sets; wherein each of said sub-channel groups comprises at least one of said sub-channels;
and sequentially carrying out demodulation processing on the sub-channel groups according to a preset sequence based on the OFDM signals so as to obtain data transmitted by the sub-channels included in the corresponding sub-channel groups after each demodulation processing.
Based on the same technical concept, the application also provides a data receiving device in the multipoint-to-point system, which comprises:
a receiving module configured to receive and buffer OFDM signals transmitted based on a number of subchannels;
a determining module configured to determine corresponding channel characteristics for the sub-channels according to the reference signals of the sub-channels, respectively;
a dividing module configured to divide all of the subchannels into at least two subchannel groups; wherein each of said sub-channel groups comprises at least one of said sub-channels;
and the demodulation module is configured to sequentially perform demodulation processing on the sub-channel groups according to a preset sequence based on the OFDM signals so as to obtain data transmitted by the sub-channels included in the corresponding sub-channel groups after each demodulation processing.
Based on the same technical concept, the application also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the method according to any one of the above.
Based on the same technical idea, the present application also provides a non-transitory computer readable storage medium storing computer instructions for causing a computer to perform the method as set forth in any one of the above.
As can be seen from the above description, the data receiving method, apparatus, electronic device and storage medium in the multipoint-to-point system provided by the present application determine the corresponding channel characteristics for each sub-channel, and when demodulating, perform a demodulation process on each sub-channel one by one according to the channel characteristics corresponding to each sub-channel, so as to obtain the data transmitted by each sub-channel. According to the scheme, the whole OFDM signal is not demodulated once, demodulation processing is carried out on each sub-channel respectively, and in each demodulation processing, only channel characteristics corresponding to the current sub-channel are used as basis, so that the problems of ICI, ISI and masking effect in the data receiving process of a multipoint-to-point system are effectively avoided, and the performance of a receiver is improved.
Drawings
In order to more clearly illustrate the technical solutions of the present application or related art, the drawings that are required to be used in the description of the embodiments or related art will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort to those of ordinary skill in the art.
Fig. 1 is a flow chart of a data receiving method in a multipoint-to-point system according to an embodiment of the present application;
fig. 2 is a schematic structural frame diagram of a receiver according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a data receiving device in the multipoint-to-point system according to the embodiment of the present application;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings.
It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present application should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "first," "second," and the like, as used in embodiments of the present application, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
In the related art, a multipoint-to-point system is an important application scenario of OFDM technology. Common multipoint-to-point systems, such as D2D (Device to Device), communicate such that terminal devices can communicate directly with each other under certain scheduling policies without passing through base station devices. More specifically, the C-V2X (cellular internet of vehicles) technology, that is, a mode similar to D2D communication, can implement inter-vehicle communication without cooperation of base stations. At this time, the receiver of the terminal device needs to simultaneously receive data transmitted from a plurality of users in one CBW or BWP. Under the C-V2X technology, a D2D connection path is implemented, which is called a sidlink (also called a PC5 interface), and is different from an Uplink, a Downlink, which is commonly known as a daily cellular communication, and is specifically referred to as a device-to-device communication under an AP device without a base station. The device may be a vehicle, a person-held device, a fixed-location device (such as a roadside device), or the like.
For the multipoint-to-point system in the related art, since the receiver needs to simultaneously receive signals transmitted from a plurality of end users, it is difficult to process frequency offset (Frequency offset error, FOE) and time offset (Timing offset error, TOE) between multiple users. Taking the Sidelink as an example, the technical difficulty of the Sidelink receiving is as follows: the scene of direct communication between vehicles belongs to a high Doppler channel environment, the channel is rapidly changed, and the problems of ICI and ISI are strong; the vehicle communicates with a plurality of other devices at the same time, different devices use different sub-channels, and the receiver needs to process a plurality of adjacent sub-channels with different FOEs and different TOEs at the same time, so that ICI and ISI problems are aggravated; there may be a large power difference between the sub-channels received by the receiver, and a masking effect (also referred to as a near-far effect) may exist.
For the related art data receiving scheme, after receiving an OFDM signal, a receiver performs a fast fourier transform (Fast Fourier Transform, FFT) on the received entire OFDM signal, and then performs control channel and shared channel decoding according to each sub-channel to obtain data transmitted by each sub-channel. However, the above-mentioned data receiving scheme is more suitable for demodulation under the Downlink technology, but is not optimized for the characteristics of the sub-channels under the direct connection of the terminal device, so when the above-mentioned scheme is used for the Downlink demodulation, there are serious ICI, ISI and masking effects.
In view of the foregoing problems in the related art, the present application provides a data receiving scheme in a multipoint-to-point system, where corresponding channel characteristics are determined for each subchannel, and when demodulation is performed, each subchannel is subjected to a one-by-one demodulation process according to the channel characteristics corresponding to each subchannel, so as to obtain data transmitted by each subchannel. According to the scheme, the whole OFDM signal is not demodulated once, demodulation processing is carried out on each sub-channel respectively, and in each demodulation processing, only channel characteristics corresponding to the current sub-channel are used as basis, so that the problems of ICI, ISI and masking effect in the data receiving process of a multipoint-to-point system are effectively avoided, and the performance of a receiver is improved.
The data receiving scheme in the multipoint-to-point system of the present application is further described below by means of specific embodiments.
First, the embodiment of the application provides a data receiving method in a multi-point-to-point system, which is applied to equipment in the multi-point-to-point system, and particularly, to a receiver for receiving an OFDM signal in the equipment. The device may be a vehicle, a device held by a person, a device with a fixed position (such as a road side device), etc., and the specific type of the device is not limited in the embodiments of the present application.
Referring to fig. 1, a flow chart of a data receiving method in a multipoint-to-point system according to an embodiment of the present application is shown. The data receiving method in the multipoint-to-point system can comprise the following steps:
step S101, an OFDM signal transmitted based on a certain number of subchannels is received and buffered.
In this embodiment, the receiver receives an OFDM signal, which is transmitted based on a certain number of sub-channels, each of which is transmitted with an OFDM subcarrier signal. Each OFDM subcarrier signal is sent by one device in the multipoint-to-point system, and the waveforms of the OFDM subcarrier signals are overlapped and transmitted, namely the OFDM signals received by a receiver.
In this embodiment, the received OFDM signal is buffered. Because in the scheme of the application, demodulation processing is performed on each sub-channel one by one, the received OFDM signal needs to be acquired each time demodulation processing is performed. Therefore, in the embodiment of the present application, the received OFDM signal is buffered, and when demodulation processing is performed each time, the buffered OFDM signal may be taken out to perform subsequent demodulation processing.
Step S102, according to the reference signals of the sub-channels, corresponding channel characteristics are respectively determined for the sub-channels.
In this embodiment, for each sub-channel, the channel characteristics corresponding to the sub-channel are determined by parameter estimation; in general, the channel characteristics may include: TOE and FOE. Specifically, for each sub-channel, the TOE and the FOE corresponding to the sub-channel may be determined according to the reference signal corresponding to the sub-channel. The reference signal may be, for example, a demodulation reference signal (Demodulatin Reference Signal, DMRS).
In this embodiment, based on the TOE and the FOE corresponding to the sub-channel, the Reference Signal Received Power (RSRP) and the signal-to-interference-plus-noise ratio (SINR) corresponding to the sub-channel may be further calculated. The signal strength of the subcarrier signal transmitted by its corresponding subchannel may be reflected by at least one of RSRP and SINR. The RSRP and SINR corresponding to the sub-channels are used to determine the order in which the demodulation process is performed for each sub-channel in a subsequent step, which will be described in detail later.
Step S103, dividing all the sub-channels into at least two sub-channel groups; wherein each of said sub-channel groups comprises at least one of said sub-channels.
In this embodiment, demodulation processing is performed for each sub-channel. In view of processing efficiency, all sub-channels may be divided into a number of sub-channel groups such that each sub-channel group includes at least one sub-channel. In this way, when the demodulation processing is performed subsequently, the demodulation processing is performed a plurality of times in the unit of sub-channel group.
In specific implementation, the specific number of the sub-channel groups can be flexibly set according to factors such as specific application scenes and channel environments. It is understood that in the embodiment of the present application, at least two sub-channel groups are provided, so that the method of the present application is distinguished from the related art. Since each sub-channel group includes at least one sub-channel, the number of sub-channel groups should not exceed the number of total sub-channels. For example, when the method of the embodiment of the present application is applied in a 20M C-V2X cellular Internet of vehicles scenario, the number of sub-channel groups is typically set to 3.
In implementation, for one sub-channel group, the number of sub-channels included in the sub-channel group can be flexibly set according to implementation requirements. For each sub-channel included in the sub-channel group, the frequency domains corresponding to the sub-channels may be continuous or discontinuous.
In this embodiment, when the sub-channel groups are divided, it may be determined to specifically divide those sub-channels into one sub-channel group according to the TOE and the FOE corresponding to each sub-channel. Specifically, the division principle may be to divide the sub-channels that are relatively close to the TOE and the FOE into a sub-channel group. Based on the above-mentioned dividing principle, dividing all sub-channels into at least two sub-channel groups may specifically include: dividing all the sub-channels into at least two sub-channel groups according to the time offset and the frequency offset corresponding to each sub-channel respectively; for any one sub-channel group, the difference value between the time offsets corresponding to any two sub-channels included in the sub-channel group is not greater than a preset time offset threshold value, and the difference value between the frequency offsets corresponding to any two sub-channels included in the sub-channel group is not greater than a preset frequency offset threshold value. In specific implementation, the similar degrees of the TOE and the FOE between the two sub-channels can be determined through the time offset threshold and the frequency offset threshold, so that the sub-channels with similar TOE and FOE are divided into a sub-channel group.
In the implementation, as the TOE and the FOE of each sub-channel included in one sub-channel group are relatively similar, the TOE and the FOE of any sub-channel in the sub-channel group can be used as the TOE and the FOE corresponding to the sub-channel group; the average value of the TOE and the FOE of each sub-channel included in the sub-channel group may be obtained, and the obtained average value may be used as the TOE and the FOE corresponding to the sub-channel group.
Step S104, based on the OFDM signal, sequentially performing demodulation processing on the subchannel groups according to a predetermined sequence, so as to obtain data transmitted by the subchannels included in the corresponding subchannel groups after each demodulation processing.
In this embodiment, since demodulation processing is performed for each sub-channel, demodulation processing may be performed sequentially for each sub-channel in a predetermined order when the demodulation processing is performed specifically. In specific implementation, the predetermined order may be determined according to RSRP and SINR corresponding to each sub-channel. The predetermined order may be determined in this embodiment by the following method: determining corresponding reference signal receiving power and/or signal-to-interference-plus-noise ratio for each sub-channel according to the corresponding time offset and frequency offset of the sub-channel respectively; and determining the preset sequence according to the received power of the reference signal and/or the signal to interference plus noise ratio corresponding to each sub-channel.
As previously described, RSRP, SINR may reflect the signal strength of the subcarrier signal transmitted by the corresponding subchannel. When determining the order of demodulation processing for each sub-channel, the demodulation processing may be sequentially performed for the sub-channels in the order of strong to weak signal strength. For example, the demodulation processing may be sequentially performed on each sub-channel in the order of the corresponding RSRP from high to low; the demodulation process may be sequentially performed on each sub-channel in the order of the higher SINR.
Further, in some embodiments, the predetermined order may also be determined taking into account both RSRP and SINR. Specifically, for each sub-channel, according to a predetermined weight value, the received power of the reference signal corresponding to the sub-channel and the signal to interference plus noise ratio are weighted and summed to obtain a characteristic index corresponding to the sub-channel; and determining the preset sequence according to the characteristic indexes respectively corresponding to the sub-channels. In the specific implementation, after the characteristic indexes corresponding to the sub-channels are obtained, the sub-channels can be sequentially subjected to demodulation processing according to the sequence from the high characteristic index to the low characteristic index. The weight values corresponding to the RSRP and the SINR respectively can be flexibly set according to implementation requirements, and specific values of the weight values are not limited in the embodiment of the present application.
In this embodiment, a certain number of sub-channels are divided into sub-channel groups, and the subsequent demodulation processing is performed in units of sub-channel groups. In each of the above embodiments for determining the predetermined order, the RSRP and the SINR may be obtained by averaging RSRP and SINR respectively corresponding to each sub-channel included in the sub-channel group. That is, the average value of the RSRP and SINR corresponding to each sub-channel is used as the RSRP and SINR of the sub-channel group to which the sub-channels belong.
In this embodiment, when demodulation processing is performed on any sub-channel group, the buffered complete OFDM signal is read first, and then the OFDM signal is demodulated according to the TOE and the FOE corresponding to the current sub-channel group. Specifically, for the OFDM signal, the respective FOE and TOE corresponding to the current subchannel set obtained by parameter estimation are compensated; and performing digital gain control on the compensated OFDM signal to adjust power, performing symbol windowing according to the time sequence of the current sub-channel, performing detection, decoding and other processing to complete demodulation, and finally obtaining the data transmitted by the sub-channel included in the current sub-channel group. In the demodulation processing, other processing is the same as the corresponding processing in the related art except for the TOE and the FOE corresponding to the current sub-channel group, and specific content thereof is not described in the embodiment of the present application.
In the implementation, after the demodulation processing is completed for the current sub-channel group, determining the next sub-channel group according to the predetermined sequence, obtaining the buffered OFDM signal, and the FOE and TOE corresponding to the next sub-channel group, and performing the demodulation processing as described above until all the sub-channel groups complete the demodulation processing, thereby obtaining the data transmitted by all the sub-channels.
As an alternative implementation manner, to further improve the quality of the received data, when any subchannel group is demodulated, the signal of the non-current subchannel group may be removed from the original received OFDM signal. By canceling the signals of the non-current sub-channel group, the influence of the signals of other channels on the demodulation of the current sub-channel group can be prevented. Specifically, the step of demodulating the OFDM signal may specifically include: filtering the OFDM signal, and eliminating signals corresponding to all sub-channels except the current sub-channel group in the OFDM signal; and demodulating the filtered OFDM signal according to the time offset and the frequency offset corresponding to the sub-channel included in the current sub-channel group. The method comprises the steps of filtering an OFDM signal, and eliminating signals of a non-current sub-channel group in the OFDM signal.
As an alternative embodiment, when any one of the sub-channel groups is subjected to demodulation processing, the signal of the sub-channel for which demodulation processing has been completed may be eliminated from the OFDM signal originally received. In view of the fact that in the embodiment of the present application, demodulation processing is performed sequentially in order of signal strength, signals of sub-channels that have completed demodulation processing are eliminated, and it is possible to prevent signals of sub-channels with stronger signal strength from having an excessive influence on a sub-channel group currently to be subjected to demodulation processing. Specifically, the step of demodulating the OFDM signal may specifically include: carrying out signal reconstruction on data transmitted by the sub-channels after demodulation processing so as to determine a reconstructed signal; removing the reconstructed signal from the OFDM signal; and demodulating the OFDM signal from which the reconstructed signal is removed according to the time offset and the frequency offset corresponding to the sub-channel included in the current sub-channel group.
As can be seen from the above embodiments, the data receiving method in the multi-point system of the present application does not demodulate the whole OFDM signal once, but demodulates each sub-channel separately, and in each demodulation process, only the time offset and the frequency offset corresponding to the current sub-channel are used as basis, so as to effectively avoid ICI, ISI and masking effect problems in the data receiving process of the multi-point system, and improve the performance of the receiver.
The data receiving method in the multipoint-to-point system according to the embodiment of the present application may be implemented based on a receiver of the architecture framework shown in fig. 2.
The radio frequency receiver, the analog-to-digital converter, the digital front end (RFIC+ADC+DFE) are used for converting the air interface radio frequency signal into a baseband, and performing relevant front end signal processing after being digitized to obtain an OFDM signal. The time domain signal buffer is configured to buffer a time domain signal with a certain length, that is, buffer an OFDM signal in the embodiment of the present application. And the digital control oscillator is used for adjusting the carrier frequency of the OFDM signal. And the digital automatic gain controller is used for adjusting the signal power. And the time domain-frequency domain converter is used for selecting a proper position from the time domain OFDM symbols to window and performing FFT. And an equalizer for compensating for channel characteristics. And the parameter estimator is used for calculating and obtaining parameters such as FOE, TOE and the like by utilizing the reference signal, transmitting the parameters to the radio frequency receiver, the analog-to-digital converter and the digital front end compensation FOE, transmitting the parameters to the time domain-to-frequency domain converter for compensating the TOE, transmitting the parameters to the equalizer for compensating the channel characteristics, and transmitting the parameters to the demodulator for inputting a signal detection algorithm.
The components shown by the dashed boxes in fig. 2 are used to implement the data receiving method in the multipoint-to-point system according to the embodiment of the present application, and since demodulation is performed on each subchannel set one by one, the flow implementation is similar to an iteration process, and an iteration controller is correspondingly provided. Specifically, the iteration controller obtains FOE, TOE, RSRP, SINR of the sub-channels given by the parameter estimator, determines the sub-channel groups and the predetermined sequence according to the method of the above embodiment, configures the FOE and the TOE to the numerically controlled oscillator and the symbol windowing controller to compensate, estimates the divided sub-channel groups and the predetermined sequence, and sequentially demodulates each sub-channel group. In one demodulation process, the iteration controller controls the time domain signal buffer to send out the cached OFDM signal, then controls the digital control oscillator to adjust the carrier frequency of the OFDM signal, and then controls the symbol windowing controller to perform symbol windowing according to the TOE compensation result of the current sub-channel group to perform FFT, and demodulation is performed through the demodulator.
Corresponding to an alternative embodiment of the above method, the receiver may further comprise a signal canceller; based on the structural framework shown in fig. 2, the signal canceller is disposed between the digitally controlled oscillator and the digital automatic gain controller. In practice, the signal canceller may be embodied as a filter for canceling signals of non-current sub-channel groups from the OFDM signal; the signal canceller may also be embodied as an adder for subtracting the reconstructed signal from the OFDM signal to cancel the signal of the sub-channel for which the demodulation process has been completed from the OFDM signal.
It should be noted that some embodiments of the present application are described above. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
Based on the same technical conception, the application also provides a data receiving device in the multipoint-to-point system, which corresponds to the method of any embodiment.
Referring to fig. 3, the data receiving apparatus 300 in the multipoint-to-point system includes:
a receiving module 301 configured to receive and buffer OFDM signals transmitted based on a certain number of subchannels;
a determining module 302, configured to determine corresponding channel characteristics for the sub-channels according to the reference signals of the sub-channels;
a dividing module 303 configured to divide all the subchannels into at least two subchannel groups; wherein each of said sub-channel groups comprises at least one of said sub-channels;
and a demodulation module 304, configured to sequentially perform demodulation processing on the sub-channel groups according to a predetermined sequence based on the OFDM signal, so as to obtain data transmitted by the sub-channels included in the corresponding sub-channel groups after each demodulation processing.
In some alternative embodiments, demodulation module 304 is specifically configured to read the buffered OFDM signal; and demodulating the OFDM signal according to the channel characteristics corresponding to the sub-channels included in the current sub-channel group.
In some optional embodiments, the demodulation module 304 is specifically configured to filter the OFDM signal, and remove signals corresponding to all sub-channels except for the current sub-channel group in the OFDM signal; and demodulating the filtered OFDM signal according to the channel characteristics corresponding to the sub-channels included in the current sub-channel group.
In some alternative embodiments, the demodulation module 304 is specifically configured to perform signal reconstruction on the data transmitted by the sub-channels that have completed the demodulation process, so as to determine a reconstructed signal; removing the reconstructed signal from the OFDM signal; and demodulating the OFDM signal from which the reconstructed signal is removed according to the channel characteristics corresponding to the sub-channels included in the current sub-channel group.
In some alternative embodiments, the channel characteristics include: time offset and frequency offset; the dividing module 303 is specifically configured to divide all the subchannels into at least two subchannel groups according to channel characteristics corresponding to the subchannels respectively; for any one of the sub-channel groups, the difference between the time offsets corresponding to any two sub-channels included in the sub-channel group is not greater than a predetermined time offset threshold, and the difference between the frequency offsets corresponding to any two sub-channels included in the sub-channel group is not greater than a predetermined frequency offset threshold.
In some optional embodiments, the demodulation module 304 is specifically configured to determine, for each of the subchannels, a corresponding reference signal received power and/or a signal-to-interference-plus-noise ratio according to a channel characteristic corresponding to the subchannel, respectively; and determining the preset sequence according to the received power of the reference signal and/or the signal to interference plus noise ratio corresponding to each sub-channel.
In some optional embodiments, the demodulation module 304 is specifically configured to, for each of the sub-channels, perform weighted summation on the reference signal received power and the signal corresponding to the sub-channel and the interference plus noise ratio according to a predetermined weight value, so as to obtain a feature index corresponding to the sub-channel; and determining the preset sequence according to the characteristic indexes respectively corresponding to the sub-channels.
For convenience of description, the above devices are described as being functionally divided into various modules, respectively. Of course, the functions of each module may be implemented in the same piece or pieces of software and/or hardware when implementing the present application.
The device of the foregoing embodiment is configured to implement the data receiving method in the corresponding multipoint-to-point system in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiment, which is not described herein.
Based on the same technical concept, the application also provides an electronic device corresponding to the method of any embodiment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the data receiving method in the multipoint-to-point system according to any embodiment when executing the program.
Fig. 4 shows a more specific hardware architecture of an electronic device according to this embodiment, where the device may include: a processor 1010, a memory 1020, an input/output interface 1030, a communication interface 1040, and a bus 1050. Wherein processor 1010, memory 1020, input/output interface 1030, and communication interface 1040 implement communication connections therebetween within the device via a bus 1050.
The processor 1010 may be implemented by a general-purpose CPU (Central Processing Unit ), microprocessor, application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits, etc. for executing relevant programs to implement the technical solutions provided in the embodiments of the present disclosure.
The Memory 1020 may be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory ), static storage device, dynamic storage device, or the like. Memory 1020 may store an operating system and other application programs, and when the embodiments of the present specification are implemented in software or firmware, the associated program code is stored in memory 1020 and executed by processor 1010.
The input/output interface 1030 is used to connect with an input/output module for inputting and outputting information. The input/output module may be configured as a component in a device (not shown) or may be external to the device to provide corresponding functionality. Wherein the input devices may include a keyboard, mouse, touch screen, microphone, various types of sensors, etc., and the output devices may include a display, speaker, vibrator, indicator lights, etc.
Communication interface 1040 is used to connect communication modules (not shown) to enable communication interactions of the present device with other devices. The communication module may implement communication through a wired manner (such as USB, network cable, etc.), or may implement communication through a wireless manner (such as mobile network, WIFI, bluetooth, etc.).
Bus 1050 includes a path for transferring information between components of the device (e.g., processor 1010, memory 1020, input/output interface 1030, and communication interface 1040).
It should be noted that although the above-described device only shows processor 1010, memory 1020, input/output interface 1030, communication interface 1040, and bus 1050, in an implementation, the device may include other components necessary to achieve proper operation. Furthermore, it will be understood by those skilled in the art that the above-described apparatus may include only the components necessary to implement the embodiments of the present description, and not all the components shown in the drawings.
The electronic device of the foregoing embodiment is configured to implement the data receiving method in the corresponding multipoint-to-point system in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiment, which is not described herein.
Based on the same technical concept, corresponding to the method of any embodiment, the application further provides a non-transitory computer readable storage medium, wherein the non-transitory computer readable storage medium stores computer instructions, and the computer instructions are used for enabling the computer to execute the data receiving method in the multipoint-to-point system according to any embodiment.
The computer readable media of the present embodiments, including both permanent and non-permanent, removable and non-removable media, may be used to implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device.
The storage medium of the foregoing embodiments stores computer instructions for causing the computer to perform the data receiving method in the multipoint-to-point system according to any one of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiments, which are not described herein.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the application (including the claims) is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the present application, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of brevity.
Additionally, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures, in order to simplify the illustration and discussion, and so as not to obscure the embodiments of the present application. Furthermore, the devices may be shown in block diagram form in order to avoid obscuring the embodiments of the present application, and this also takes into account the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform on which the embodiments of the present application are to be implemented (i.e., such specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the application, it should be apparent to one skilled in the art that embodiments of the application can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative in nature and not as restrictive.
While the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of those embodiments will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.
The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Accordingly, any omissions, modifications, equivalents, improvements and/or the like which are within the spirit and principles of the embodiments are intended to be included within the scope of the present application.
Claims (9)
1. A method of data reception in a multi-point to point system, comprising:
receiving and buffering OFDM signals transmitted based on a certain number of sub-channels;
respectively determining corresponding channel characteristics for the sub-channels according to the reference signals of the sub-channels;
dividing all the subchannels into at least two subchannel sets; wherein each of said sub-channel groups comprises at least one of said sub-channels;
sequentially performing demodulation processing on the sub-channel groups according to a preset sequence based on the OFDM signals so as to obtain data transmitted by the sub-channels included in the corresponding sub-channel groups after each demodulation processing;
wherein the method further comprises determining the predetermined order by: according to the channel characteristics corresponding to each sub-channel, respectively determining corresponding reference signal receiving power and/or signal-to-interference-plus-noise ratio for the sub-channels; and determining the preset sequence according to the received power of the reference signal and/or the signal to interference plus noise ratio corresponding to each sub-channel.
2. The method of claim 1, wherein the demodulation process comprises:
reading the cached OFDM signal;
and demodulating the OFDM signal according to the channel characteristics corresponding to the sub-channels included in the current sub-channel group.
3. The method of claim 2, wherein demodulating the OFDM signal according to the channel characteristics corresponding to the subchannels included in the current subchannel set comprises:
filtering the OFDM signal, and eliminating signals corresponding to all sub-channels except the current sub-channel group in the OFDM signal;
and demodulating the filtered OFDM signal according to the channel characteristics corresponding to the sub-channels included in the current sub-channel group.
4. The method of claim 2, wherein demodulating the OFDM signal according to the channel characteristics corresponding to the subchannels included in the current subchannel set comprises:
carrying out signal reconstruction on data transmitted by the sub-channels after demodulation processing so as to determine a reconstructed signal;
removing the reconstructed signal from the OFDM signal;
and demodulating the OFDM signal from which the reconstructed signal is removed according to the channel characteristics corresponding to the sub-channels included in the current sub-channel group.
5. The method of claim 1, wherein the channel characteristics comprise: time offset and frequency offset;
said dividing all of said sub-channels into at least two sub-channel groups comprises:
dividing all the sub-channels into at least two sub-channel groups according to the channel characteristics corresponding to the sub-channels respectively; for any one of the sub-channel groups, the difference between the time offsets corresponding to any two sub-channels included in the sub-channel group is not greater than a predetermined time offset threshold, and the difference between the frequency offsets corresponding to any two sub-channels included in the sub-channel group is not greater than a predetermined frequency offset threshold.
6. The method according to claim 1, wherein said determining said predetermined order based on the reference signal received power and/or signal to interference plus noise ratio for each of said sub-channels, respectively, comprises:
for each sub-channel, according to a preset weight value, carrying out weighted summation on the received power of the reference signal corresponding to the sub-channel and the signal to interference plus noise ratio to obtain a characteristic index corresponding to the sub-channel;
and determining the preset sequence according to the characteristic indexes respectively corresponding to the sub-channels.
7. A data receiving apparatus in a multi-point to point system, comprising:
a receiving module configured to receive and buffer OFDM signals transmitted based on a number of subchannels;
a determining module configured to determine corresponding channel characteristics for the sub-channels according to the reference signals of the sub-channels, respectively;
a dividing module configured to divide all of the subchannels into at least two subchannel groups; wherein each of said sub-channel groups comprises at least one of said sub-channels;
the demodulation module is configured to sequentially perform demodulation processing on the sub-channel groups according to a preset sequence based on the OFDM signals so as to obtain data transmitted by the sub-channels included in the corresponding sub-channel groups after each demodulation processing;
the demodulation module is specifically configured to determine corresponding reference signal receiving power and/or signal-to-interference-plus-noise ratio for each sub-channel according to the channel characteristics corresponding to the sub-channel respectively; and determining the preset sequence according to the received power of the reference signal and/or the signal to interference plus noise ratio corresponding to each sub-channel.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 6 when the program is executed by the processor.
9. A non-transitory computer readable storage medium storing computer instructions for causing a computer to perform the method of any one of claims 1 to 6.
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