CN113260065B - Method, processor, receiver and storage medium for determining transmission frequency band - Google Patents
Method, processor, receiver and storage medium for determining transmission frequency band Download PDFInfo
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Abstract
The embodiment of the invention provides a method, a processor, a receiver and a storage medium for determining a transmission frequency band. The method comprises the following steps: receiving frame control data corresponding to frame signals sent by a plurality of frequency bands; preprocessing the frame control data; and blind detection is carried out on the preprocessed frame control data, so that the transmission frequency band of each frame control data is determined according to a cyclic redundancy check algorithm. By the method, the receiver does not need to know the position of the common subcarrier in advance, the common subcarrier can be omitted between different sending frequency bands, a reserved field of a variable region is not used, the receiver can perform blind detection on the frame control data sent by any sending end to determine the sending frequency band of each frame control data, and the communication cost is reduced.
Description
Technical Field
The present invention relates to the field of computer technologies, and in particular, to a method, a processor, a receiver, and a storage medium for determining a transmission frequency band.
Background
With the development of computer technology, carrier communication systems are also more and more widely used. However, in the related art, a reserved field of a variable region is used in transmitting frame control data, and frame payload band information is appended to identify a band used for a frame payload. When receiving the frame control data, the receiver demodulates only the common subcarrier part of all the available frequency bands, thereby demodulating the frame control. However, only demodulating the common subcarrier part of all available frequency bands requires that the common subcarrier position is predicted in advance, and requires that common subcarriers are needed between different frequency bands, which limits the range of frequency band switching, and also limits that this scheme can only be applied to the current power line carrier communication system, and cannot expand the application range thereof.
Disclosure of Invention
An object of an embodiment of the present invention is to provide a method, a processor, a receiver, and a storage medium for determining a transmission frequency band.
In order to achieve the above object, a first aspect of the present invention provides a method for determining a transmission frequency band, including:
receiving frame control data corresponding to frame signals sent by a plurality of frequency bands;
preprocessing the frame control data;
and blind detection is carried out on the preprocessed frame control data, so that the transmission frequency band of each frame control data is determined according to a cyclic redundancy check algorithm.
A second aspect of the present invention provides a processor configured to execute the method for determining a transmission frequency band described above.
A third aspect of the invention provides a receiver comprising a processor according to the above.
A fourth aspect of the present invention provides a machine-readable storage medium having stored thereon instructions which, when executed by a processor, cause the processor to be configured to perform the above-mentioned method for determining a transmission frequency band.
In the method, the receiver does not need to know the position of a common subcarrier in advance, common subcarriers are not needed among different transmitting frequency bands, a reserved field of a variable region is not needed, and the receiver can perform blind detection on the frame control data transmitted by any transmitting end to determine the transmitting frequency band of each frame control data, so that the communication cost is reduced.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
fig. 1 is a schematic diagram illustrating an application environment of a method for determining a transmission frequency band according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating a method for determining a transmission frequency band according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a structure of a complete physical frame transmitted by a transmitting end according to an embodiment of the present invention;
fig. 4 schematically shows a diagram of a transmitting end and a receiving end for frame control data and frame payload data processing operations according to an embodiment of the present invention;
fig. 5 is a flowchart schematically illustrating a method for determining a transmission frequency band according to another embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are referred to in the embodiments of the present application, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between the various embodiments can be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
The method for determining the transmission frequency band provided by the present application can be applied to the application environment shown in fig. 1. Wherein, the transmitting end 102 performs data interaction with the receiver 104 through carrier communication. For example, the sending end 102 may send the frame signal to the receiver 104 through a plurality of different frequency bands, and when receiving the frame signal, the receiver 104 receives the frame control data corresponding to the frame signal sent by the sending end 102 first, and then further receives the frame load data corresponding to the frame signal.
Fig. 2 is a flowchart schematically illustrating a method for determining a transmission frequency band according to an embodiment of the present invention. As shown in fig. 2, in an embodiment of the present invention, a method for determining a transmission frequency band is provided, which includes the following steps:
When the sending end sends the frame signal, the frame signal can be sent through a plurality of different frequency bands. The receiving end may receive frame control data corresponding to frame signals transmitted by multiple frequency bands. The frame signal includes frame control data and frame payload data. Further, the frame signal may be a PPDU (PLCP sublayer protocol data unit) signal frame. Fig. 3 shows a structural diagram of a complete physical frame transmitted by a transmitting end. As can be seen from the figure, a complete physical frame comprises frame control data and frame payload data. The frame preamble is a periodic sequence, and can be used for frame synchronization to determine the validity of the frame control data. The frame control data includes control information of the frame signal, such as the size of a data packet corresponding to the frame signal, and a code modulation scheme used for the frame signal. The frame payload data includes valid data of the frame signal, and the valid data may be information to be actually transmitted by the frame signal.
When the sending end sends each frame signal, it processes the frame control data and frame load data correspondingly. Therefore, after receiving the frame control data, the receiver also needs to process the frame control data accordingly to acquire the original data of the frame control data.
In one embodiment, preprocessing frame control data comprises: determining a first processing operation performed by a transmitting end for frame control data before transmitting a frame signal; and performing the inverse operation of the first processing operation on the frame control data to obtain the original frame control data corresponding to each frame control data.
When transmitting a frame signal, a transmitting end performs a series of processing operations on frame control data and frame payload data of the frame signal according to a predetermined protocol. For example, the communication protocol may be a FC protocol (Fibre Channel). For convenience of description, the processing operation performed by the transmitting end for the frame control data may be referred to as a first processing operation, and the processing operation performed for the frame payload data may be referred to as a second processing operation. After determining the first processing operation performed by the transmitting end for the frame control data before transmitting the frame signal, the receiver may perform an inverse operation of the first processing operation for the frame control data after receiving the frame control data to obtain original frame control data corresponding to each frame control data. For example, assume that the first processing operation includes: turbo coding → channel interleaving → diversity copy → constellation point mapping → inverse fourier transform. Then the inverse of the first processing operation is: fourier transform → demodulation → diversity combining → channel deinterleaving → Turbo decoding. After performing the inverse operation of the first processing operation on the frame control data, the original frame control data corresponding to each frame control data can be obtained.
Specifically, in one embodiment, the first processing operation comprises at least one of forward error correction, constellation point mapping, inverse fast fourier transform, cyclic prefix addition, and windowing processing operation, the forward error correction of the first processing operation comprising at least one of Turbo coding, channel interleaving, and diversity copying.
Forward error correction is an error control method, which means that a signal is encoded according to a certain algorithm before being sent to a transmission channel, a redundant code with the characteristics of the signal is added, and the received signal is decoded at a receiving end according to a corresponding algorithm, so that an error code generated in the transmission process is found out and corrected. The constellation point mapping may also be referred to as constellation map mapping, and refers to converting digital information generated by a source into symbols in a frequency domain by using IQ modulation to generate a corresponding symbol sequence. The Turbo code is formed by parallel concatenation of two recursive systematic convolutional codes (RSC), has the characteristics of random-like codes, has excellent performance under the high-noise environment with low signal-to-noise ratio of a channel, and also has strong anti-fading and anti-interference capabilities. Channel interleaving is a coding technique for dispersing a longer burst error code into a random error code and then correcting the random error code, and the transmission capability of communication can be improved by adopting the channel interleaving. The diversity copy is used to diversity and map the original signal. The available carrier numbers corresponding to different frequency bands are different, and the corresponding diversity copying modes are also different, so that the diversity processing can be carried out on the original signal according to the corresponding copying times under different frequency bands.
In one embodiment, the method further comprises: before receiving frame control data corresponding to frame signals sent by a plurality of frequency bands, carrying out frame synchronization on each frame control data by using a periodic sequence of frame preamble; determining a time domain starting position of each frame of control data according to the frame synchronization so as to determine the effectiveness of each frame of control data according to the time domain starting position; frame control data is received starting at a time domain start position.
The receiver may frame synchronize the frame control data using an autocorrelation algorithm with a periodic sequence of frame preambles before receiving the frame control data. Due to the influence of noise and interference, an error condition occurs in the frame synchronization code group, and a synchronization missing problem occurs. In order to correctly separate each path of time slot signal, the sending end can provide a start mark of each frame, and the validity of the frame signal can be determined by detecting and acquiring the mark at the receiving end. After the receiver performs frame synchronization on each frame control data, the time domain starting position of the frame control data can be determined, so that the validity of each frame control data can be determined according to the time domain starting position, and then the frame control data determined to be valid data is received, that is, the frame control data can be received from the time domain starting position.
In one embodiment, when transmitting frame control data, a transmitting end transmits data packets with a predetermined number of symbols corresponding to each frame control data; judging whether the frame control data sent by any frequency band is received completely comprises the following steps: determining the number of preset symbols of frame control data corresponding to each transmitting frequency band; determining the number of received symbols of the frame control data of each transmission frequency band according to the received frame control data; and under the condition that the number of the received symbols reaches the preset number of symbols, determining that the frame control data transmitted by the frequency band corresponding to the number of the received symbols is completely received.
Specifically, the receiver may obtain all the frame control data corresponding to the frame signals sent by the n frequency bands at one time, and determine the predetermined number of symbols corresponding to each frame control data, that is, the specific number of the multiple data packets corresponding to each frame control data. The receiver may determine, according to a predetermined communication protocol, what the predetermined number of symbols of each frequency band is, referred to as the predetermined number of symbols. At the present stage, although the receiver cannot determine the transmission frequency band corresponding to each frame control data, the receiver may determine the predetermined number of symbols of each frequency band according to the content specified in the pre-agreed communication protocol. Therefore, the receiver can determine whether the frame control data of any frequency band has been received completely according to all the received frame control data, and then the receiver can determine the received frame control data to determine the transmission frequency band of the part of frame control data. Specifically, the receiver may determine the number of received symbols of the frame control data for each transmission band based on the received frame control data. Comparing the received symbol number corresponding to any frequency band with the predetermined symbol number, if the received symbol number reaches the predetermined symbol number, it can be determined that the frame control data sent by the frequency band has been received by the receiver. The receiver can perform blind detection on the part of the received frame control data to determine the corresponding transmission frequency band of each frame control data, so that the processing delay of the data can be reduced.
As can be seen in connection with the above-described embodiments, the receiver may determine the temporal starting position of each frame control data after frame synchronization of the frame control data. The receiver may then receive frame control data starting at the time domain starting location. Meanwhile, when the transmitting end transmits the frame control data, the transmitting end divides the frame control data into a plurality of data packets, namely, data packets with a predetermined number of symbols. The receiver starts receiving frame control data from the time domain start position and can start determining whether the number of received data packets (the number of received symbols) has reached a predetermined number of symbols. If the number of received symbols reaches the predetermined number of symbols, it may be determined that the reception of the frame control data transmitted by the receiver for the frequency band is completed.
In one embodiment, the method further comprises: and under the condition that the data packets with the preset symbol number corresponding to the frame control data are received completely, performing diversity combination on the data packets with the preset symbol number to receive the complete frame control data.
Further, for the frame control data of a certain frame signal, when the transmitting end transmits the frame control data of the frame signal, the transmitting end performs diversity copying on the frame control data to obtain a plurality of data packets. That is, the transmitting end divides one frame control data into a plurality of packets to transmit. For the receiver, first, whether the plurality of data packets of the frame control data are received can be determined according to the time domain start position of the frame control data. After the complete reception is determined, if the receiver wants to acquire the complete data of the frame control data, it needs to receive a plurality of data packets of the frame control data first, and then perform diversity combining on the plurality of data packets, so as to obtain the complete data of the frame control data.
In one embodiment, the method further comprises: after receiving frame control data corresponding to frame signals sent by a plurality of frequency bands, judging whether the frame control data sent by any frequency band is received completely; and under the condition that the frame control data transmitted by any frequency band is determined to be completely received, determining the transmission frequency band corresponding to the received frame control data according to a cyclic redundancy check algorithm.
Because the number of symbols of the frame control data corresponding to different frequency bands is different, if the frame control detection is started under the condition that the frame control symbols of all the frequency bands are completely received as adopted in the prior art, for the frequency band with less number of symbols of the frame control data, larger time delay exists, and the real-time property of data transmission is not utilized. Therefore, the frame control data transmitted in any frequency band can be determined, and if the receiver determines that the frame control data transmitted in any frequency band has been received, the cyclic redundancy check algorithm can be used to check the part of the received frame control data in advance to determine the transmission frequency band corresponding to each frame control data.
And 203, performing blind detection on the preprocessed frame control data to determine the transmission frequency band of each frame control data according to a cyclic redundancy check algorithm.
After receiving all the frame control data, the receiving end cannot determine the transmission frequency band corresponding to each frame control data. That is, the receiving end receives a plurality of pieces of frame control data, but does not know the transmission band of each piece of frame control data. The receiving end can adjust its receiving frequency band to the transmitting frequency band after determining the transmitting frequency band of the frame control data, so as to receive the frame load data corresponding to the frame control data. For example, the frame signal a includes frame control data a1 and frame payload data a 2. After receiving the frame control data a1, the receiver needs to determine its corresponding transmission frequency band f1, and then adjust its own frequency band to the frequency band corresponding to f1, so as to receive the frame payload data a2 corresponding to the frame control data a 1. Therefore, after receiving the frame control data, the receiver needs to determine the transmission frequency band of each frame control data as soon as possible.
In one embodiment, the blind detection of the preprocessed frame control data to determine the transmission frequency band of each frame control data according to the cyclic redundancy check algorithm includes: for each frame control data, sequentially selecting a frequency band from a plurality of preset frequency bands as a supposed transmission frequency band of the frame control data; and checking each assumed transmission frequency band according to a cyclic redundancy check algorithm to determine the transmission frequency bands of all the frame control data.
After receiving all receivable frame control data, the receiver can preprocess the frame control data and perform blind detection on the preprocessed frame control data. When performing blind detection on frame control data, for each frame control data, the receiver may sequentially select one frequency band from a plurality of preset frequency bands as an assumed transmission frequency band of the frame control data, and Check each assumed transmission frequency band according to a Cyclic Redundancy Check (CRC) algorithm to determine the transmission frequency band of all the frame control data. CRC is a channel coding technique that generates a short fixed bit check code from data, such as network packets or computer files, and is used primarily to detect or verify errors that may occur after data transmission or storage.
In one embodiment, checking each of the assumed transmission bands according to a cyclic redundancy check algorithm to determine the transmission band of the frame control data comprises: determining a supposed transmission frequency band as a transmission frequency band of the frame control data under the condition that the result of the cyclic redundancy check is a first preset value; and under the condition that the result of the cyclic redundancy check is a second preset value, determining that the assumed transmission frequency band is not the transmission frequency band of the frame control data.
When each assumed transmission frequency band is checked through a cyclic redundancy algorithm, if the result of the cyclic redundancy check is a first preset value, the assumed transmission frequency band can be determined to be the transmission frequency band of the frame control data; otherwise, the frame is not the transmission frequency band of the frame control data. For example, the first preset value is 0, and the second preset value is 1, which indicates that when the result of the cyclic redundancy check is 0, the receiver may determine that the assumed transmission frequency band is a transmission frequency band of the frame control data; if the result of the cyclic redundancy check is 1, it may be determined that the assumed transmission band is not the transmission band of the frame control data.
In one embodiment, each frame signal comprises frame control data and frame payload data, the frame payload data comprising payload data in the frame signal, the method further comprising: after the transmission frequency band of each frame control data is determined according to a cyclic redundancy check algorithm, the frame load data transmitted through the transmission frequency band is received to obtain effective data in a frame signal.
For each frame signal, the frame signal comprises frame control data and frame payload data, the frame payload data comprising payload data in the frame signal. When the receiver receives the frame signal sent by the sending end, the receiving sequence is as follows: reception frame control data → frame control detection (determination of a specific transmission band) → reception frame payload data. It can be seen that after the receiver receives the frame control data, it needs to determine the transmission frequency band corresponding to the frame control data, and then adjust the receiver to the corresponding frequency band, so that it can receive the frame load data corresponding to the frame control data, and thus can obtain the valid data included in the frame signal corresponding to the frame load data. Further, the number of frame control symbols corresponding to each frequency band may also be determined according to a predefined communication protocol.
In one embodiment, the method further comprises: determining a second processing operation performed by the transmitting end for the frame payload data before transmitting the frame signal after receiving the frame payload data transmitted through the assumed transmission frequency band; the inverse of the second processing operation is performed on the frame payload data to obtain the original frame payload data corresponding to each frame payload data.
Further, after receiving the frame payload data, the receiver also needs to determine the second processing operation performed by the transmitting end for the frame payload data before transmitting the frame signal according to the predefined communication protocol. The receiver may then perform the inverse of this second processing operation on the received frame payload data to obtain the original frame payload data corresponding to each frame payload data. Since the receiver has already determined the transmission frequency band of each frame control data, the receiver can receive the frame payload data in the frequency band corresponding to each transmission frequency band, and improve the reception performance by diversity combining.
In particular, the second processing operation comprises at least one of a forward error correction, constellation point mapping, inverse fast fourier transform, adding a cyclic prefix, and windowing processing operation; the forward error correction of the second processing operation includes at least one of scrambling, Turbo coding, channel interleaving, and diversity copying.
As shown in fig. 4, before transmitting a frame signal, a transmitting end processes both frame control data and frame payload data corresponding to the frame signal, which may be referred to as a first processing operation and a second processing operation, respectively. In the embodiment shown in fig. 4, the first processing operation performed by the transmitting end for the frame control data includes: turbo coding, channel interleaving, diversity copying, constellation point mapping, inverse fast Fourier transform, cyclic prefix adding and windowing. The second processing operation performed by the transmitting end for the frame payload data includes: scrambling, Turbo coding, channel interleaving, diversity copying, constellation point mapping, inverse fast Fourier transform, cyclic prefix adding and windowing. And adding marks to the frame signals before the subsequent frame is added, and then transmitting the frame control data and the frame load data to a power line channel through the analog front end so as to transmit the data to a receiver. The receiver, after receiving the frame control data and the frame payload data, also performs the inverse of the first processing operation and the second processing operation, respectively, thereon. Specifically, after receiving the frame control data, the analog front end performs automatic gain control on the frame control data and performs frame synchronization on the frame control data, and the receiver may receive the frame control data determined to belong to valid data. The receiver may then perform the inverse of the first processing operation on the frame control data, including: fourier transform, demodulation, diversity combining, channel de-interleaving, Turbo decoding, and the inverse operation may further include operations such as windowing, cyclic prefix removal, and the like, which are mainly determined according to the first processing operation. In this manner, the original data of the frame control data can be acquired. The receiver, upon receiving the frame payload data, also performs an inverse of the second processing operation on the frame payload data, including: fourier transform, demodulation, diversity combination, channel de-interleaving, Turbo decoding and descrambling. Likewise, the inverse operations may also include windowing, cyclic prefix removal, etc., determined primarily from the second processing operation. In this way, raw data of frame payload data can be acquired.
According to the method for determining the transmission frequency band, the receiver can receive the frame control data corresponding to the frame signals transmitted by the multiple frequency bands at one time, and then the blind detection is carried out on the frame control data to determine the transmission frequency band of each frame control data. Meanwhile, the receiver can perform data interaction with the transmitting end using other standard protocols, so that the method is applicable to other communication systems and is not limited to power line carrier communication systems.
In one embodiment, as shown in fig. 5, there is also provided a method for determining a transmission frequency band, including the steps of:
step 501, frame synchronization is performed on frame control data corresponding to a frame signal sent by a sending end by using a periodic sequence of frame preambles.
In step 504, a first processing operation performed by the transmitting end for frame control data before transmitting a frame signal is determined.
Step 507, determining the number of received symbols of the frame control data of each transmission frequency band according to the received frame control data.
Step 508, determining whether the number of received symbols reaches a predetermined number of symbols, if yes, go to step 509; if not, go to step 503.
In step 509, it is determined that the frame control data transmitted through the frequency band corresponding to the number of received symbols has been received.
Step 510, diversity combining and decoding are performed on the multiple data packets to obtain the original frame control data.
Step 511, determining the transmission frequency band corresponding to the received frame control data according to a cyclic redundancy check algorithm.
Step 512, receiving the frame payload data transmitted through the transmission frequency band to obtain the valid data in the frame signal.
In step 513, a second processing operation performed by the transmitting end for the frame payload data before transmitting the frame signal is determined.
When the sending end sends the frame signal, the frame signal can be sent through a plurality of different frequency bands. The receiving end may receive frame control data corresponding to frame signals transmitted by multiple frequency bands. The frame signal includes frame control data and frame payload data. The frame preamble is a periodic sequence, and can be used for frame synchronization to determine the validity of the frame control data. The frame control data includes control information of the frame signal, such as the size of a data packet corresponding to the frame signal, a coding modulation scheme adopted by the frame signal, and the like. The frame payload data includes valid data of the frame signal. The frame control data may be frame synchronized by the analog front end using an autocorrelation algorithm with a periodic sequence of frame preambles to determine a time domain starting position for each frame control data to determine the validity of the frame control data. The receiver may receive the frame control data determined to be valid and receive the frame control data starting from the time domain start position.
Further, when transmitting a frame signal, the transmitting end performs a series of processing operations on the frame control data and the frame payload data of the frame signal according to the specifications in the predetermined communication protocol. For convenience of description, the processing operation performed by the transmitting end for the frame control data may be referred to as a first processing operation, and the processing operation performed for the frame payload data may be referred to as a second processing operation. Specifically, in one embodiment, the first processing operation comprises at least one of forward error correction, constellation point mapping, inverse fast fourier transform, cyclic prefix addition, and windowing processing operation, the forward error correction of the first processing operation comprising at least one of Turbo coding, channel interleaving, and diversity copying. After determining the first processing operation performed by the transmitting end for the frame control data before transmitting the frame signal, the receiver may perform an inverse operation of the first processing operation for the frame control data after receiving the frame control data to obtain original frame control data corresponding to each frame control data. For example, assume that the first processing operation includes: turbo coding → channel interleaving → diversity copy → constellation point mapping → inverse fourier transform. Then the inverse of the first processing operation is: fourier transform → demodulation → diversity combining → channel deinterleaving → Turbo decoding. The receiver may perform the inverse of the first processing operation, e.g., fourier transform, demodulation, etc., on the frame control data each time it receives one. Then, after all the frame control data are performed with corresponding inverse operations, diversity combining and decoding operations can be performed, and all the frame control data after the inverse operations are combined and decoded, so that the original frame control data corresponding to the frame control data can be obtained.
In order to determine whether all the frame control data has been received, the receiver may determine a predetermined number of symbols of the frame control data corresponding to each transmission frequency band, and determine the number of received symbols of the frame control data of each transmission frequency band according to the received frame control data. Comparing the received symbol number corresponding to any frequency band with the predetermined symbol number, if the received symbol number reaches the predetermined symbol number, it can be determined that the frame control data sent by the frequency band has been received by the receiver. Further, after the receiver determines that the frame control data is completely received, if the receiver wants to acquire the complete data of the frame control data, it needs to receive the data packets of the predetermined number of symbols of the frame control data first, and then performs diversity combining on the multiple data packets, so as to obtain the complete data of the frame control data. Because the number of symbols of the frame control data corresponding to different frequency bands is different, if the frame control detection is started under the condition that the frame control symbols of all the frequency bands are completely received as adopted in the prior art, for the frequency band with less number of symbols of the frame control data, larger time delay exists, and the real-time property of data transmission is not utilized. Specifically, the receiver may determine the frame control data transmitted in any frequency band, and if the receiver determines that the frame control data transmitted in any frequency band has been received completely, the receiver may perform blind detection on the received frame control data first, and perform check on the received frame control data first by using a cyclic redundancy check algorithm, so as to determine the transmission frequency band corresponding to each frame control data.
In one embodiment, the method further comprises: preprocessing frame control data before diversity combination is carried out on data packets with a preset number of symbols; preprocessing frame control data includes: performing an inverse of the constellation point mapping, inverse fast fourier transform, cyclic prefix addition, and windowing processing operations in a first processing operation on the frame control data; after diversity combining the data packets of the predetermined number of symbols, the inverse operation of forward error correction is performed on the frame control data.
After performing the inverse operation of the first processing operation on the frame control data, the original data of the frame control data may be acquired. The receiver may then diversity combine the multiple data packets to receive the complete frame control data. Specifically, the receiver may perform inverse operations of constellation point mapping, inverse fast fourier transform, cyclic prefix addition, and windowing processing operations on the frame control data before diversity combining, and may perform inverse operations of forward error correction on the frame control data after diversity combining.
After receiving all the frame control data, the receiving end cannot determine the transmission frequency band corresponding to each frame control data. That is, the receiving end receives a plurality of pieces of frame control data, but does not know the transmission band of each piece of frame control data. The receiving end can adjust its receiving frequency band to the transmitting frequency band after determining the transmitting frequency band of the frame control data, so as to receive the frame load data corresponding to the frame control data. Therefore, after receiving the frame control data, the receiver needs to determine the transmission frequency band of each frame control data as soon as possible. Specifically, when performing blind detection on frame control data, for each frame control data, the receiver may sequentially select one frequency band from a plurality of preset frequency bands as a supposed transmission frequency band of the frame control data, and check each supposed transmission frequency band according to a cyclic redundancy check algorithm (crc algorithm) to determine the transmission frequency bands of all frame control data. If the result of the cyclic redundancy check is a first preset value, determining that the assumed transmission frequency band is the transmission frequency band of the frame control data; otherwise, the frame is not the transmission frequency band of the frame control data. For example, the first preset value is 0, and the second preset value is 1, which indicates that when the result of the cyclic redundancy check is 0, the receiver may determine that the assumed transmission frequency band is a transmission frequency band of the frame control data; if the result of the cyclic redundancy check is 1, it may be determined that the assumed transmission band is not the transmission band of the frame control data.
After determining the transmission frequency band corresponding to each frame control data, the receiver may adjust its frequency band to the transmission frequency band to receive the frame load data transmitted by the transmission frequency band. When the receiver receives the frame signal sent by the sending end, the receiving sequence is as follows: reception frame control data → frame control detection (determination of a specific transmission band) → reception frame payload data. It can be seen that after the receiver receives the frame control data, it needs to determine the transmission frequency band corresponding to the frame control data, and then adjust the receiver to the corresponding frequency band, so that it can receive the frame load data corresponding to the frame control data, and thus can obtain the valid data included in the frame signal corresponding to the frame load data.
Further, the number of frame control symbols corresponding to each frequency band may also be determined according to a predefined communication protocol. After receiving the frame payload data, the receiver also needs to determine the second processing operation performed by the transmitting end for the frame payload data before transmitting the frame signal according to the predefined communication protocol. The receiver may then perform the inverse of this second processing operation on the received frame payload data to obtain the original frame payload data corresponding to each frame payload data. Since the receiver has already determined the transmission frequency band of each frame control data, the receiver can receive the frame payload data in the frequency band corresponding to each transmission frequency band, and improve the reception performance by diversity combining. In particular, the second processing operation comprises at least one of a forward error correction, constellation point mapping, inverse fast fourier transform, adding a cyclic prefix, and windowing processing operation; the forward error correction of the second processing operation includes at least one of scrambling, Turbo coding, channel interleaving, and diversity copying.
In one embodiment, a storage medium is provided, on which a program is stored, which when executed by a processor implements the above-described method for determining a transmission frequency band.
The embodiment of the invention provides a processor, which is used for running a program, wherein the method for determining the transmission frequency band is executed when the program runs.
The embodiment of the invention provides equipment, which comprises a processor, a memory and a program which is stored on the memory and can run on the processor, wherein the processor realizes the steps of the method for determining the transmitting frequency band when executing the program.
The present application further provides a computer program product adapted to perform a program of initializing method steps for determining a transmission frequency band when executed on a data processing device.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may 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, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may 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 computer storage media 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 that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (11)
1. A method for determining a transmission frequency band, comprising:
receiving frame control data corresponding to frame signals sent by a plurality of frequency bands, wherein a sending end sends data packets with a preset symbol number corresponding to each frame control data when sending the frame control data;
after receiving frame control data corresponding to frame signals sent by a plurality of frequency bands, preprocessing the frame control data;
judging whether the frame control data transmitted by any frequency band is received completely;
under the condition that the frame control data transmitted by any frequency band is determined to be received completely, one frequency band is sequentially selected from a plurality of preset frequency bands as a supposed transmission frequency band of the frame control data for each frame control data;
checking each assumed transmission frequency band according to a cyclic redundancy check algorithm;
determining the assumed transmission frequency band as the transmission frequency band of the frame control data under the condition that the result of the cyclic redundancy check is a first preset value;
determining that the assumed transmission frequency band is not the transmission frequency band of the frame control data under the condition that the result of the cyclic redundancy check is a second preset value;
the judging whether the frame control data sent by any frequency band is received completely comprises the following steps:
determining the predetermined symbol number of the frame control data corresponding to each transmission frequency band;
determining the number of received symbols of the frame control data of each transmission frequency band according to the received frame control data;
and under the condition that the number of the received symbols reaches the preset number of symbols, determining that the frame control data transmitted through the frequency band corresponding to the number of the received symbols has been received.
2. The method for determining the transmission frequency band according to claim 1, wherein the preprocessing the frame control data comprises:
determining a first processing operation performed by a transmitting end for the frame control data before transmitting the frame signal;
and performing the inverse operation of the first processing operation on the frame control data to obtain original frame control data corresponding to each frame control data.
3. The method of claim 2, wherein the first processing operation comprises at least one of forward error correction, constellation point mapping, inverse fast fourier transform, cyclic prefix addition, and windowing processing operation, and wherein the forward error correction of the first processing operation comprises at least one of Turbo coding, channel interleaving, and diversity copying.
4. The method for determining a transmission frequency band according to claim 1, further comprising:
and under the condition that the data packets with the preset symbol number corresponding to the frame control data are all received, performing diversity combination on the data packets with the preset symbol number to receive the complete frame control data.
5. The method for determining a transmission frequency band according to claim 1, further comprising:
before receiving frame control data corresponding to frame signals sent by a plurality of frequency bands, carrying out frame synchronization on each frame control data by using a periodic sequence of frame preamble;
determining a time domain starting position of each frame control data according to the frame synchronization so as to determine the effectiveness of each frame control data according to the time domain starting position;
receiving frame control data starting from the time domain start position.
6. The method for determining a transmission frequency band according to claim 1, wherein each frame signal includes frame control data and frame payload data, the frame payload data including valid data in the frame signal, the method further comprising:
and after the transmitting frequency band of each frame of control data is determined according to a cyclic redundancy check algorithm, receiving frame load data transmitted through the transmitting frequency band to acquire effective data in the frame signal.
7. The method for determining a transmission frequency band according to claim 6, further comprising:
after the receiving of the frame load data transmitted through the transmission frequency band, determining a second processing operation performed by a transmitting end on the frame load data before the transmitting end transmits the frame signal;
performing an inverse of the second processing operation on the frame payload data to obtain original frame payload data corresponding to each frame payload data.
8. The method for determining a transmission frequency band according to claim 7,
the second processing operation comprises at least one of a forward error correction, constellation point mapping, inverse fast Fourier transform, cyclic prefix addition, and windowing processing operation;
the forward error correction includes at least one of scrambling, Turbo coding, channel interleaving, and diversity copying.
9. The method for determining the transmission frequency band according to any one of claims 1 to 8, wherein the method is applied to a power line carrier communication system or an internet of things communication system.
10. A receiver comprising a processor, wherein the processor is configured to perform the method for determining a transmission frequency band according to any one of claims 1 to 9.
11. A machine-readable storage medium having instructions stored thereon, which when executed by a processor causes the processor to be configured to perform a method for determining a transmission frequency band according to any one of claims 1 to 9.
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Address after: 100192 building 3, A District, Dongsheng science and Technology Park, Zhongguancun, 66 Haidian District West Road, Beijing. Patentee after: BEIJING SMARTCHIP MICROELECTRONICS TECHNOLOGY Co.,Ltd. Patentee after: Qingdao Zhixin Semiconductor Technology Co.,Ltd. Patentee after: STATE GRID CORPORATION OF CHINA Patentee after: STATE GRID INFORMATION & TELECOMMUNICATION GROUP Co.,Ltd. Address before: 100192 building 3, A District, Dongsheng science and Technology Park, Zhongguancun, 66 Haidian District West Road, Beijing. Patentee before: BEIJING SMARTCHIP MICROELECTRONICS TECHNOLOGY Co.,Ltd. Patentee before: State Grid Sigi Ziguang (Qingdao) Microelectronics Technology Co.,Ltd. Patentee before: STATE GRID CORPORATION OF CHINA Patentee before: STATE GRID INFORMATION & TELECOMMUNICATION GROUP Co.,Ltd. |