CN109218242B - Symbol synchronization method, signal adjustment system, and computer-readable storage medium - Google Patents
Symbol synchronization method, signal adjustment system, and computer-readable storage medium Download PDFInfo
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- CN109218242B CN109218242B CN201710531001.2A CN201710531001A CN109218242B CN 109218242 B CN109218242 B CN 109218242B CN 201710531001 A CN201710531001 A CN 201710531001A CN 109218242 B CN109218242 B CN 109218242B
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- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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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
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- H—ELECTRICITY
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Abstract
The invention discloses a symbol synchronization method, a signal adjustment system and a computer readable storage medium, wherein the symbol synchronization method comprises the following steps: the method comprises the steps that a sending end takes any baseband link as a first reference path, and frame structure parameters of other baseband links of the sending end are adjusted respectively based on the frame structure parameters of the first reference path; the sending end takes any adjusted baseband link as an adjusting path, and respectively calculates time delay between other baseband links and the adjusting path based on frame structure parameters of the adjusting path; and the sending end performs symbol synchronization on the frame structure parameters of all the baseband links according to the time delay between all other baseband links and the adjusting path. According to the invention, the signal frame structure parameters of the baseband link are coordinated with each other, the time delay of different baseband links is calculated, and the link time delay is adjusted, so that the baseband signal can be effectively and orderly sent in the transmission process, the signal data transmission efficiency is improved, and the communication quality of a signal adjustment system is further improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a symbol synchronization method, a signal adjustment system, and a computer-readable storage medium.
Background
With the rapid development of wireless data transmission communication technology, people have higher and higher requirements on data transmission efficiency. Currently, a communication transmission system is composed of an indoor unit and an outdoor unit, which are connected to each other by an intermediate frequency cable and are data transceiving ends. Due to the difference of the lengths of the used intermediate frequency cables, when the signals of all the transmitting ends reach the antennas of the respective transmitting ends, the signals of the transmitting ends are not aligned. Moreover, the transmission delays of the spatial links are also inconsistent, so for the receiving-end antenna, the received signals of the transmitting-end antennas are not aligned, and the signals are not aligned, which reduces the data transmission efficiency of the transmitting-receiving end, and further reduces the communication quality.
Disclosure of Invention
The present invention is directed to a symbol synchronization method, a signal adjustment system and a computer readable storage medium, which are used to solve the technical problem of communication quality degradation caused by symbol misalignment.
In order to achieve the above object, an embodiment of the present invention provides a symbol synchronization method based on a transmitting end, where the symbol synchronization method based on the transmitting end includes:
the method comprises the steps that a sending end takes any baseband link as a first reference path, and frame structure parameters of other baseband links of the sending end are adjusted respectively based on the frame structure parameters of the first reference path;
the sending end takes any adjusted baseband link as an adjusting path, and respectively calculates the time delay between other baseband links and the adjusting path based on the frame structure parameters of the adjusting path;
and the sending end performs symbol synchronization on the frame structure parameters of all the baseband links according to the time delay between all other baseband links and the adjusting path.
Optionally, the step of using any baseband link as the first reference link, and respectively adjusting the frame structure parameters of other baseband links of the transmitting end based on the frame structure parameters of the first reference link by the transmitting end includes:
the method comprises the steps that a sending end takes any baseband link as a first reference path and sends heartbeat signals and parameter information to other baseband links of the sending end;
a sending end acquires target parameter information which is sent to a first reference path by other baseband links based on heartbeat signals and parameter information;
and the transmitting end performs symbol offset on the second sequences in other baseband links based on the target parameter information and the first sequence of the first reference path to maintain that the first sequences and the second sequences of other baseband links are staggered in each baseband link.
Optionally, the step of symbol synchronization performed by the sending end on the frame structure parameters of all the baseband links according to the time delays between all the other baseband links and the adjustment path further includes:
the sending end sends the proofreading information to the receiving end based on the baseband link completing the symbol synchronization so that the receiving end can calculate the symbol deviation value;
and the sending end adjusts the time delay of all baseband links of the sending end according to the symbol deviant fed back by the receiving end.
Optionally, before the step of adjusting the time delays of all baseband links at the transmitting end according to the symbol offset value fed back by the receiving end, the method further includes:
the sending end detects whether all baseband links receive the symbol deviant fed back by the receiving end;
and when all the base band links of the sending end do not receive the symbol deviant fed back by the receiving end, re-acquiring the symbol deviant fed back by the receiving end.
Optionally, the step of adjusting, by the sending end, the time delays of all baseband links of the sending end according to the symbol offset value fed back by the receiving end includes:
a sending end acquires all symbol deviant values fed back by a receiving end and maps all the symbol deviant values to corresponding baseband links;
and the sending end adjusts the time delay of all corresponding baseband links based on the symbol deviation value and a preset error, wherein the preset error is a time delay jitter error generated by data communication among the baseband branches.
Optionally, the transmitting end is in a training frame adjustment mode,
the step of adjusting the time delays of all baseband links at the transmitting end by the transmitting end according to the symbol deviation value fed back by the receiving end further comprises:
the transmitting end switches the base band link from the training frame adjusting mode to the data frame transmitting mode and synchronizes the data frame transmitting mode to the receiving end.
Optionally, the symbol synchronization method based on the receiving end includes:
the receiving end receives the proofreading information of all the baseband links sent by the sending end;
the receiving end takes any baseband link as a second reference path, and respectively calculates the symbol deviation values of other baseband links and the second reference path according to the proofreading information;
and the receiving end feeds back the symbol deviation value to a corresponding baseband link in the transmitting end.
Optionally, the symbol offset value is obtained by calculating a symbol offset of the calibration information of the baseband link and an error offset in the symbol transmission process.
The invention also provides a signal adjusting system, which comprises a sending end and a receiving end, wherein the sending end comprises:
the first adjusting module is used for adjusting the frame structure parameters of other baseband links at the transmitting end respectively based on the frame structure parameters of the first reference path by taking any baseband link as the first reference path;
the first calculation module is used for calculating time delay between other baseband links and the adjusting path respectively based on the frame structure parameters of the adjusting path by taking any adjusted baseband link as the adjusting path;
and the synchronization module is used for carrying out symbol synchronization on the frame structure parameters of all the baseband links according to the time delay between all the other baseband links and the adjustment path.
A sending module, configured to send the calibration information to the receiving end based on the baseband link that completes symbol synchronization;
the second adjusting module is used for adjusting the time delay of all baseband links at the sending end according to the symbol deviant fed back by the receiving end;
the receiving end includes:
the receiving module is used for receiving the proofreading information of all the baseband links sent by the sending end;
the second calculation module is used for taking any baseband link as a second reference path and respectively calculating the symbol deviation values of other baseband links and the second reference path according to the proofreading information;
and the feedback module is used for feeding back the symbol deviation value to the corresponding baseband link in the sending end.
Further, to achieve the above object, the present invention also provides a computer-readable storage medium storing one or more programs, the one or more programs being executable by one or more processors for:
the method comprises the steps that a sending end takes any baseband link as a first reference path, and frame structure parameters of other baseband links of the sending end are adjusted respectively based on the frame structure parameters of the first reference path;
the sending end takes any adjusted baseband link as an adjusting path, and respectively calculates the time delay between other baseband links and the adjusting path based on the frame structure parameters of the adjusting path;
and the sending end performs symbol synchronization on the frame structure parameters of all the baseband links according to the time delay between all other baseband links and the adjusting path.
In the technical scheme of the invention, a sending end takes any baseband link as a first reference path, and respectively adjusts the frame structure parameters of other baseband links of the sending end based on the frame structure parameters of the first reference path; then the sending end takes any adjusted baseband link as an adjusting path, and respectively calculates the time delay between other baseband links and the adjusting path based on the frame structure parameters of the adjusting path; and finally, the sending end performs symbol synchronization on the frame structure parameters of all the baseband links according to the time delay between all other baseband links and the adjusting path. According to the invention, the signal frame structure parameters of the baseband link are coordinated with each other, the time delay of different baseband links is calculated, and the link time delay is adjusted, so that the baseband signal can be effectively and orderly sent in the transmission process, the signal data transmission efficiency is improved, and the communication quality of a signal adjustment system is further improved.
Drawings
Fig. 1 is a schematic diagram of a frame structure adjustment process in a first embodiment of a symbol synchronization method based on a transmitting end according to the present invention;
fig. 2 is a schematic flowchart of a first embodiment of a symbol synchronization method based on a transmitting end according to the present invention;
fig. 3 is a schematic detailed flow chart of a step in which, in a second embodiment of the symbol synchronization method based on a transmitting end of the present invention, the transmitting end uses any baseband link as a first reference link and performs frame structure parameter adjustment on other baseband links of the transmitting end based on frame structure parameters of the first reference link;
fig. 4 is a schematic flowchart of a third embodiment of a symbol synchronization method based on a transmitting end according to the present invention;
fig. 5 is a schematic flowchart of a fourth embodiment of a symbol synchronization method based on a transmitting end according to the present invention;
fig. 6 is a detailed flowchart illustrating a step of adjusting delays of all baseband links at a transmitting end by the transmitting end according to a symbol offset value fed back by a receiving end in a fifth embodiment of the symbol synchronization method based on the transmitting end according to the present invention;
fig. 7 is a flowchart illustrating a sixth embodiment of a symbol synchronization method based on a transmitting end according to the present invention;
FIG. 8 is a flowchart illustrating a symbol synchronization method based on a receiving end according to a first embodiment of the present invention;
FIG. 9 is a system diagram of a signal conditioning system according to the present invention;
fig. 10 is a schematic device structure diagram of a hardware operating environment according to a method of an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a symbol synchronization method based on a sending end, and in a first embodiment of the symbol synchronization method based on the sending end, referring to fig. 2, the symbol synchronization method based on the sending end comprises the following steps:
step S10, the sending end takes any baseband link as a first reference path, and respectively adjusts the frame structure parameters of other baseband links of the sending end based on the frame structure parameters of the first reference path;
in the communication transceiver, when a transmitting end and a receiving end perform wireless transmission, signals need to be connected to a transmission unit through an intermediate frequency cable, and due to the difference in the lengths of the intermediate frequency cables, when channels of the transmitting end reach an antenna of the transmitting end, the signals of the transmitting end cannot be aligned normally and synchronously. The sending end generally transmits signals through multiple baseband links, so that all baseband links of the sending end need to cooperate with each other to ensure that the sending end can send the signals completely and effectively, otherwise, the signals sent by the multiple baseband links respectively generate an effect of superposition interference, so that the signals are seriously distorted, and the communication quality is greatly reduced. In order to ensure that the multi-path baseband link can ensure high quality and fidelity of signal transmission, the transmitting end needs to adjust the coordination transmitting function of each path of baseband link.
In order to coordinate the sending function of each baseband link, this embodiment effectively adjusts the sending process of different baseband links in the sending end by adjusting the link parameters of each baseband link.
The transmitting end can train the frame mode to adjust the parameters of each baseband link. The multi-channel baseband link sends a training frame, and the existence of each channel of signal is detected through heartbeat signals among all channels of signals. When the signals of the multiple baseband links exist, the physical frame parameters of each channel are adjusted to be the same by sending parameter information mutually. When in adjustment, any one path of baseband link is set as any baseband link, any baseband link is used as a reference path, and other baseband links perform parameter adjustment by using the first reference path as a reference.
For ease of understanding the parameter adjustment process, the following is explained by way of an example:
taking the MIMO transmission system as an example, the MIMO transmission system adjusts the baseband link by using a training frame structure. Referring to fig. 1, in the frame format of the training frame: and n is the number of baseband links of the transmitting end, and m is the number of baseband links of the receiving end. In the training frame of the ith path of signal, the training sequence i is used as a marker of a position point, a sequence with better autocorrelation and poorer cross correlation characteristics is generally used, and the training sequences in each path of signal are orthogonal. The training sequence is a preset code element contained in a transmitted training frame and is used for synchronization and channel estimation of a receiving end. All zero symbols are arranged in the training frame of the ith path at the positions corresponding to other non-ith path training sequences, and K guard bands of all zero symbols are arranged among the training sequence i, the training sequence i-1 and the training sequence i + 1. The all-zero symbol is used as buffer data when signals of the baseband link are superposed, and the phenomena of signal interference and signal distortion are prevented. The purpose of the guard band of the K all-zero symbols is to ensure that the training sequence in the training frame of each path is not interfered by signals of other paths when the MIMO paths are not aligned, so that the symbol length of the guard band is related to the maximum value of the estimated offset value of the receiving end. The symbol length of the guard band is larger than or equal to the maximum value of the estimated deviant of the receiving end, so that the training sequence in each path of training frame can be ensured not to be interfered by other paths of signals.
Step S20, the sending end takes any adjusted baseband link as an adjusting path, and respectively calculates time delay between other baseband links and the adjusting path based on the frame structure parameters of the adjusting path;
after signal adjustment, the sending end uses any one of the baseband links as an adjustment path for calculating the link delay, and calculates the delay of the high-speed transmission channel from the adjustment path to each other baseband signal. The calculation method is as follows: the adjusting circuit sends link time delay calculation signals to other baseband links, and simultaneously starts a counter, and other paths directly loop the signals back to the adjusting circuit after receiving the signals. And after receiving the loopback signal, the adjusting circuit stops counting, and the time delay of the unidirectional link is obtained by dividing the counting result by two. The number of counters is equal to the number of signal paths minus one. For convenience of subsequent description, it is assumed that there are N paths of signals, and the calculated time delay of N-1 unidirectional links is t1, t2,. Multidot.and tN-1, and tmax represents the maximum value of t1, t2,. Multidot.and tN-1.
And step S30, the sending end carries out symbol synchronization on the frame structure parameters of all the baseband links according to the time delay between all other baseband links and the adjusting path.
The sending end resets the baseband signals of each baseband link, and after the resetting is released, the baseband signals are firstly cached in the memory and are not output for the moment. And other baseband links actively send the memory state information to the adjusting path. After the adjusting path receives the memory state information transmitted by other baseband links, the counter is started after the memory of each other baseband link and the adjusting path is in the condition of data caching. The counter starts counting from 0 and sends an indication of the start of data output to the other N-1 ways at a time when the counter has a value tmax-t1, tmax-t2, \ 8230;, tmax-tN-1. And after receiving the instruction of starting outputting the data transmitted by the adjusting path, other baseband links start outputting the data in the memory thereof. When the counter counts tmax, the adjusting circuit starts to output data in the memory of the adjusting circuit, so that the output data of the multi-stage baseband signal at the transmitting end completes the symbol synchronization alignment process.
In the technical scheme of the invention, a sending end takes any baseband link as a first reference path, and respectively adjusts the frame structure parameters of other baseband links of the sending end based on the frame structure parameters of the first reference path; then the sending end takes any adjusted baseband link as an adjusting path, and respectively calculates the time delay between other baseband links and the adjusting path based on the frame structure parameters of the adjusting path; and finally, the transmitting end performs symbol synchronization on the frame structure parameters of all the baseband links according to the time delay between all other baseband links and the adjusting path. According to the invention, the signal frame structure parameters of the baseband link are coordinated with each other, the time delay of different baseband links is calculated, and the link time delay is adjusted, so that the baseband signal can be effectively and orderly sent in the transmission process, the signal data transmission efficiency is improved, and the communication quality of a signal adjustment system is further improved.
Further, on the basis of the first embodiment of the symbol synchronization method based on the transmitting end, the invention proposes a second embodiment of the symbol synchronization method based on the transmitting end, and referring to fig. 3, the difference between the second embodiment and the first embodiment is that,
the step that the sending end takes any baseband link as a first reference path and respectively adjusts the frame structure parameters of other baseband links of the sending end based on the frame structure parameters of the first reference path comprises the following steps:
step S11, a sending end uses any baseband link as a first reference path and sends heartbeat signals and parameter information to other baseband links of the sending end;
in this embodiment, any one of the baseband links is used as a reference link and set as a first reference link, and the heartbeat signal and the parameter information of the baseband link are sent to other baseband links except the baseband link. The heartbeat signal is a test signal, a small data packet is sent to the other party of the interconnection at intervals, and whether a communication link between the two parties of the interconnection is disconnected or not is judged according to the reply condition of the other party. The delay adjustment can be realized only if the normal communication between the baseband links is possible, and the parameter information refers to the frame structure parameter in the first reference path and is used as the reference basis for the adjustment of other baseband links. Since the first reference path is an adjustment basis for multiple baseband links in the transmitting end, the first reference path needs to inform the parameter information of other baseband links.
Step S12, a sending end obtains target parameter information sent to a first reference path by other baseband links based on heartbeat signals and parameter information;
and step S13, the transmitting end performs symbol offset on second sequences in other baseband links based on the target parameter information and the first sequence of the first reference path to maintain that the first sequences and the second sequences of other baseband links are staggered in each baseband link.
When the first reference path sends heartbeat signals and parameter information to other baseband links, the other baseband links also send the heartbeat signals and the parameter information to the first reference path. The first reference access acquires target parameter information of other baseband links. The target parameter information refers to frame structure information of other baseband links, and the sending end can obtain training sequences in all baseband links according to the target parameter information. Because training sequences exist in different baseband links, the training sequence in the first reference path is set as a first sequence, the training sequences in other baseband links are set as second sequences, and the first sequence is used as a reference basis, so that the training sequences of other baseband links can be subjected to symbol offset, and the first sequence and the second sequence are staggered in each baseband link.
It should be noted that the second sequence is a generic term, and the training sequences in the multiple other baseband links may be set as a third sequence, a fourth sequence, and so on. The symbol offset processing of each training sequence causes each training sequence to be in a state of being staggered with respect to each other in each baseband link.
Further, on the basis of the second embodiment of the symbol synchronization method based on the transmitting end, a third embodiment of the symbol synchronization method based on the transmitting end is proposed, and referring to fig. 4, a difference between the third embodiment and the second embodiment is that the step of performing, by the transmitting end, symbol synchronization on the frame structure parameters of all the baseband links according to the time delays between all the other baseband links and the adjustment path further includes:
step S40, the transmitting end transmits the proofreading information to the receiving end based on the baseband link completing the symbol synchronization so that the receiving end can calculate the symbol deviant;
after completing symbol synchronization processing of each baseband link, the transmitting end needs to transmit the calibration information to the receiving end. The transmitting end can orderly and effectively transmit the baseband signals after symbol synchronization processing, but the receiving end needs to adapt and adjust the baseband signals transmitted by the transmitting end so as to better receive the baseband signals transmitted by the transmitting end. The calibration process at the receiving end requires reference of signal data at the transmitting end, so the transmitting end needs to send calibration information to the receiving end after completing the symbol synchronization process, so that the receiving end can calculate the symbol offset value. The symbol deviation value is a data detection value based on the received calibration information at the receiving end and can be used as reference data for further fine adjustment of the baseband signal.
And S50, the sending end adjusts the time delay of all baseband links of the sending end according to the symbol deviant fed back by the receiving end.
After the transmitting end transmits the calibration information, the receiving end replies a symbol offset value corresponding to the calibration information so that the transmitting end can adjust the delay signal of the baseband link. Since the transmitting end is processed by symbol synchronization, all baseband links can already realize aligned transmission of baseband signals, and the symbol offset value is readjusted on the baseband links after symbol synchronization, so all baseband links of the transmitting end may be staggered again. In order to ensure that the information of the training sequence does not generate the phenomenon of overlapping interference in each path of baseband signal, the length of the guard band of all zero symbols is larger than the maximum value of the symbol offset of the baseband link.
Further, on the basis of the third embodiment of the symbol synchronization method based on the transmitting end, a fourth embodiment of the symbol synchronization method based on the transmitting end is proposed, and referring to fig. 5, a difference between the fourth embodiment and the third embodiment is that the step of adjusting the time delays of all baseband links of the transmitting end by the transmitting end according to the symbol offset value fed back by the receiving end further includes:
step S60, the sending end detects whether all baseband links receive the symbol deviant fed back by the receiving end;
when adjusting the time delays of all the baseband links in the transmitting end, it is necessary to ensure that all the baseband links in the transmitting end can completely receive the symbol offset value fed back by the receiving end. Since the overlap of baseband signals is generated by overlapping signals of multiple baseband links, each baseband link needs to be fine-tuned precisely. Otherwise, once one of the baseband links fails to receive the symbol deviation value, which results in one of the baseband links being missed in the adjustment process, the missed baseband link may generate a distortion interference phenomenon after multiple baseband signals are overlapped due to the fact that fine alignment is not performed, thereby affecting communication quality.
Step S70, when all the base band links of the sending end do not receive the symbol deviation value fed back by the receiving end, re-obtain the symbol deviation value fed back by the receiving end.
If the sending end detects that at least one baseband link in all baseband links does not receive the symbol offset value, the sending end will re-acquire the symbol offset value fed back by the receiving end. Here, the symbol offset value fed back by the receiving end may be a missed symbol offset value of the baseband link, or may be a symbol offset value of all baseband links, and may be set and adjusted according to an actual situation.
Further, on the basis of the fourth embodiment of the symbol synchronization method based on the transmitting end of the present invention, a fifth embodiment of the symbol synchronization method based on the transmitting end is proposed, and referring to fig. 6, a difference between the fifth embodiment and the fourth embodiment is that the step of adjusting, by the transmitting end, the time delays of all baseband links of the transmitting end according to a symbol offset value fed back by the receiving end includes:
step S51, the sending end obtains all the symbol deviant values fed back by the receiving end and maps all the symbol deviant values to corresponding baseband links;
the sending end receives and acquires all the symbol deviation values fed back by the receiving end, and the symbol deviation values are provided with the coding information of each baseband link, so that the sending end can accurately distinguish which baseband link each symbol deviation value is for, that is, the sending end can correspond the symbol deviation values to the baseband links which need to carry out symbol deviation specifically. For example, the transmitting end receives 3 symbol offset values a, B, and C, where a, B, and C each include a corresponding baseband link, and the symbol offset value is calculated according to the calibration information sent by each baseband link.
And step S52, the sending end adjusts the time delay of all corresponding baseband links based on the symbol deviation value and a preset error, wherein the preset error is a time delay jitter error generated by data communication among the baseband branches.
In a sending end, due to differences among hardware, lines, specifications or interference influences, processing and adjusting effects of each baseband link may not necessarily accord with an extremely fine flow, so that a delay jitter phenomenon occurs. Therefore, in this embodiment, a preset error is set as a tolerance range of the baseband link due to the inability to completely perform symbol synchronization alignment. The sending end adjusts the time delay of the baseband link according to the symbol deviation value and the preset error, and the preset error can ensure that the sending of the baseband signal is still within a controllable range and does not influence the transmission of the communication signal under the condition that each baseband branch circuit performs symbol synchronization alignment imperfectly, so that higher communication quality is ensured.
Further, on the basis of the fifth embodiment of the symbol synchronization method based on the transmitting end of the present invention, a sixth embodiment of the symbol synchronization method based on the transmitting end is proposed, and referring to fig. 7, the difference between the sixth embodiment and the fifth embodiment is that the transmitting end is in a training frame adjustment mode,
the step that the sending end adjusts the time delay of all baseband links of the sending end according to the symbol deviant value fed back by the receiving end further comprises:
step S80, the transmitting end switches the baseband link from the training frame adjustment mode to the data frame transmitting mode, and synchronizes the data frame transmitting mode to the receiving end.
The training frame adjustment mode refers to a mode for performing symbol synchronization alignment and baseband signal adjustment on a baseband link by using a training frame. The data frame sending mode is a mode for normally sending the baseband signal. When the transmitting end is in the training frame adjusting mode, but not in the normal data frame transmitting mode, if the transmitting end does not switch the training frame adjusting mode to the data frame transmitting mode after completing the delay adjustment, each path of baseband link will continue to transmit data in the form of training frames, and the training frames are used as the specified format for adjusting the communication signals, and the transmitted baseband signals do not have real meanings, and the normal communication function cannot be maintained. Therefore, the transmitting end needs to switch the training frame adjustment mode of the baseband link to the data frame transmission mode, and meanwhile, after the transmitting end is switched to the data frame transmission mode, the receiving end does not need to maintain the training frame adjustment mode, and the data frame transmission mode of the transmitting end can be synchronized to the receiving end as long as the transmitting end is switched to the data frame transmission mode.
The present invention further provides a symbol synchronization method based on a receiving end, where in a first embodiment of the symbol synchronization method based on the receiving end, referring to fig. 8, the symbol synchronization method based on the receiving end includes:
step S90, the receiving end receives the proofreading information of all the baseband links sent by the sending end;
the receiving end receives the proofreading information which is sent by the sending end and is formed by overlapping each path of baseband link. Since the baseband link of the receiving end may cause the receiving process of the baseband signal to be non-uniform due to the influence of uncontrollable factors such as hardware, carrier specifications, etc., the calibration information cannot be received completely due to distortion, and the calibration information will be used as important reference data for calculating the symbol offset value of the receiving end in order to ensure that each baseband link of the receiving end can normally receive the accurate baseband signal.
Step S100, the receiving end takes any baseband link as a second reference path, and respectively calculates symbol deviation values of other baseband links and the second reference path according to the proofreading information;
step S110, the receiving end feeds back the symbol offset value to the corresponding baseband link in the transmitting end.
And taking any baseband link in the receiving end as a second reference path, and respectively calculating the symbol deviation value of each baseband link and the second reference path according to the calibration information received by each baseband link. The symbol deviant can correct signals according to delay or symbol asynchronism in the receiving process of the proofreading information, and the correction mode is that the accurate receiving can be completed only by adjusting the time delay of a baseband link corresponding to the sending end. Namely, the calculation and correction mode of the receiving end is to reversely deduce the exact value of the sending end needing time delay or time advance according to the receiving condition of the receiving end on the calibration information, and the time delay and the time advance can be represented in the form of a sign. For example, the baseband link obtains whether to increase or decrease the delay according to the calculation result. If the calculation result is N symbols faster than the reference path, the fact that the time delay of the N symbols needs to be increased for the road base band link of the sending end is proved; if the calculation result is N symbols slower than the reference path, it proves that the path of the transmitting end needs to reduce the time delay of N symbols. N may be an integer or a fraction, and the specific accuracy is determined by the sampling multiple of the data used for the bias estimation.
After obtaining the symbol deviation value, the receiving end feeds back the symbol deviation value to the baseband link of the transmitting end through the original paths of the multiple baseband links corresponding to the respective calibration information, so that the transmitting end can perform delay adjustment according to the symbol deviation value.
Further, on the basis of the first embodiment of the symbol synchronization method based on the receiving end, the present invention proposes a second embodiment of the symbol synchronization method based on the receiving end, and the difference between the second embodiment and the first embodiment is that the symbol offset value is obtained by calculating the symbol offset of the calibration information of the baseband link and the error offset in the symbol transmission process.
The calibration information is transmitted through a baseband link of the transmitting end, and a certain signal offset occurs through real carriers or virtual carriers such as an intermediate frequency link, an analog device, a spatial link and the like, so that a certain data symbol offset also exists in the obtained calibration information at the receiving end. Therefore, in a real scenario, the calculation of the symbol offset value needs to consider the hardware of the baseband link itself or the transmission bias to generate the symbol offset, and also needs to consider the symbol offset factor of the baseband link during transmission. Through the mode of adding a detector sensor and the like, the related factors generating the symbol deviation can be quantized to form quantized data, so that the symbol deviation of the correction information and the error deviation in the symbol transmission process are quantized into parameters and are obtained through algorithm calculation.
Referring to fig. 10, fig. 10 is a schematic device structure diagram of a hardware operating environment related to a method according to an embodiment of the present invention.
The terminal of the embodiment of the invention can be a PC, and can also be a terminal device such as a smart phone, a tablet computer, an electronic book reader, an MP3 (Moving Picture Experts Group Audio Layer III, dynamic video Experts compress standard Audio Layer 3) player, an MP4 (Moving Picture Experts Group Audio Layer IV, dynamic video Experts compress standard Audio Layer 3) player, a portable computer and the like.
As shown in fig. 10, the signal conditioning system may include: a processor 1001, such as a CPU, a memory 1005, and a communication bus 1002. The communication bus 1002 is used for realizing connection communication between the processor 1001 and the memory 1005. The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001 described previously.
Optionally, the signal conditioning system may further include a user interface, a network interface, a camera, RF (Radio Frequency) circuitry, sensors, audio circuitry, a WiFi module, and the like. The user interface may comprise a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface may also comprise a standard wired interface, a wireless interface. The network interface may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface).
Those skilled in the art will appreciate that the signal conditioning system configuration shown in fig. 10 does not constitute a limitation of the signal conditioning system, and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 10, a memory 1005, which is a kind of computer storage medium, may include therein an operating system, a network communication module, and a symbol synchronization program. The operating system is a program that manages and controls the signal conditioning system hardware and software resources, supporting the execution of symbol synchronization programs as well as other software and/or programs. The network communication module is used to enable communication between the various components within the memory 1005, as well as with other hardware and software in the signal conditioning system.
An embodiment of the present invention provides a signal adjustment system, where the signal adjustment system includes a transmitting end and a receiving end, and referring to fig. 9, the signal adjustment system includes a transmitting end and a receiving end, where the transmitting end includes:
a first adjusting module 10, configured to use any baseband link as a first reference link, and perform frame structure parameter adjustment on other baseband links at the sending end based on frame structure parameters of the first reference link;
in the communication transceiver, when a transmitting end and a receiving end perform wireless transmission, signals need to be connected to a transmission unit through an intermediate frequency cable, and due to the difference in lengths of the intermediate frequency cable, when channels of the transmitting end reach an antenna of the transmitting end, the signals of the transmitting end cannot be aligned normally. The sending end generally transmits signals through multiple baseband links, so that all baseband links of the sending end need to cooperate with each other to ensure that the sending end can send the signals completely and effectively, otherwise, the signals sent by the multiple baseband links respectively generate an effect of superposition interference, so that the signals are seriously distorted, and the communication quality is greatly reduced. In order to ensure that the multiple baseband links can ensure high quality and fidelity of signal transmission, the transmitting end needs to adjust the coordination transmitting function of each baseband link.
In order to coordinate the sending function of each baseband link, this embodiment effectively adjusts the sending process of different baseband links in the sending end by adjusting the link parameters of each baseband link.
The transmitting end can train the frame mode to adjust the parameters of each baseband link. The multi-channel baseband link sends a training frame, and the existence of each channel of signal is detected among all channels of signals through heartbeat signals. When the signals of the multiple baseband links exist, the physical frame parameters of each channel are adjusted to be the same by sending parameter information mutually. When adjusting, any one of the baseband links is set as any one of the baseband links, any one of the baseband links is set as a reference path, and the other baseband links perform parameter adjustment by taking the first reference path as a reference.
To facilitate understanding of the parameter adjustment process, the following is explained by way of an example:
taking the MIMO transmission system as an example, the MIMO transmission system adjusts the baseband link by using a training frame structure. Referring to fig. 1, in the frame format of the training frame: and n is the number of baseband links of the transmitting end, and m is the number of baseband links of the receiving end. In the training frame of the ith path of signal, the training sequence i is used as a marker of a position point, a sequence with better autocorrelation and poorer cross correlation characteristics is generally used, and the training sequences in each path of signal are orthogonal. The training sequence is a preset code element contained in a transmitted training frame and is used for synchronization and channel estimation of a receiving end. All zero symbols are arranged in the training frame of the ith path at the positions corresponding to other non-ith path training sequences, and K guard bands of all zero symbols are arranged among the training sequence i, the training sequence i-1 and the training sequence i + 1. The all-zero symbol is used as buffer data when signals of the baseband link are superposed, and the phenomena of signal interference and signal distortion are prevented. The purpose of the guard band of the K all-zero symbols is to ensure that the training sequence in the training frame of each path is not interfered by signals of other paths when the MIMO paths are not aligned, so that the symbol length of the guard band is related to the maximum value of the estimated offset value of the receiving end. The symbol length of the guard band is larger than or equal to the maximum value of the estimated deviation value of the receiving end, so that the training sequence in each path of training frame is ensured not to be interfered by other paths of signals.
A first calculating module 20, configured to use any one of the adjusted baseband links as an adjustment path, and calculate, based on frame structure parameters of the adjustment path, time delays between other baseband links and the adjustment path, respectively;
after signal adjustment, the sending end uses any one of the baseband links as an adjustment path for calculating the link delay, and calculates the delay of the high-speed transmission channel from the adjustment path to each other baseband signal. The calculation method is as follows: the adjusting circuit sends link time delay calculation signals to other baseband links, and simultaneously starts a counter, and other paths directly loop the signals back to the adjusting circuit after receiving the signals. And after the adjusting circuit receives the loopback signal, stopping counting, and dividing the counting result by two to obtain the time delay of the unidirectional link. The number of counters is equal to the number of signal paths minus one. For convenience in subsequent description, it is assumed that there are N paths of signals, and the calculated time delay of N-1 unidirectional links is t1, t 2.. And tN-1, and tmax represents the maximum value of t1, t 2.. And tN-1.
And a synchronization module 30, configured to perform symbol synchronization on the frame structure parameters of all the baseband links according to the time delays between all the other baseband links and the adjustment path.
The sending end resets the baseband signals of each baseband link, and after the resetting is released, the baseband signals are firstly cached in the memory and are not output for the moment. And other baseband links actively send the memory state information to the adjusting path. After the adjusting path receives the memory state information transmitted by other baseband links, the counter is started after the memory of each other baseband link and the adjusting path is in the condition of data caching. The counter starts counting from 0, and an indication of the start of data output is sent to the other N-1 ways at the time when the counter has the values tmax-t1, tmax-t2, \ 8230;, and tmax-tN-1. And after receiving the instruction of starting outputting the data transmitted by the adjusting path, other baseband links start outputting the data in the memory thereof. When the counter counts tmax, the adjusting circuit starts to output data in the memory of the adjusting circuit, so that the output data of the multilevel baseband signal at the transmitting end is used for finishing the symbol synchronization alignment process.
A sending module 40, configured to send the calibration information to the receiving end based on the baseband link that completes symbol synchronization;
after completing symbol synchronization processing of each baseband link, the transmitting end needs to transmit the calibration information to the receiving end. The transmitting end can orderly and effectively transmit the baseband signals after symbol synchronization processing, but the receiving end needs to adapt and adjust the baseband signals transmitted by the transmitting end so as to better receive the baseband signals transmitted by the transmitting end. The calibration process at the receiving end requires reference of signal data at the transmitting end, so the transmitting end needs to send calibration information to the receiving end after completing the symbol synchronization process, so that the receiving end can calculate the symbol offset value. The symbol deviation value is a data detection value based on the received calibration information at the receiving end and can be used as reference data for further fine adjustment of the baseband signal.
A second adjusting module 50, configured to adjust the time delays of all baseband links at the transmitting end according to the symbol offset value fed back by the receiving end;
after the transmitting end transmits the calibration information, the receiving end replies a symbol offset value corresponding to the calibration information so that the transmitting end can adjust the delay signal of the baseband link. Since the sending end is processed by symbol synchronization, all baseband links can already realize alignment sending of baseband signals, and the symbol deviation value is readjusted on the baseband links after symbol synchronization, so that all baseband links of the sending end may be staggered again. In order to ensure that the information of the training sequence does not generate the phenomenon of overlapping interference in each path of baseband signal, the length of the guard band of all zero symbols is larger than the maximum value of the symbol offset of the baseband link.
The receiving end includes:
a receiving module 60, configured to receive the calibration information of all baseband links sent by the sending end;
when adjusting the time delays of all the baseband links in the transmitting end, it is necessary to ensure that all the baseband links in the transmitting end can completely receive the symbol offset value fed back by the receiving end. Since the overlap of baseband signals is generated by overlapping signals of multiple baseband links, each baseband link needs to be fine-tuned precisely. Otherwise, once one of the baseband links fails to receive the symbol deviation value, which results in one path being missed in the adjustment process, the missed baseband link may generate a distortion interference phenomenon after multiple baseband signals are overlapped due to the fact that fine alignment is not performed, thereby affecting communication quality.
A second calculating module 70, configured to use any baseband link as a second reference path, and calculate symbol deviation values of other baseband links and the second reference path according to the calibration information;
if the sending end detects that at least one baseband link in all baseband links does not receive the symbol offset value, the sending end will re-acquire the symbol offset value fed back by the receiving end. The symbol offset value fed back by the receiving end may be a missed symbol offset value of the baseband link, or may be a symbol offset value of all baseband links, and may be set and adjusted according to an actual situation.
And a feedback module 80, configured to feed back the symbol offset value to a corresponding baseband link in the transmitting end.
The training frame adjustment mode refers to a mode for performing symbol synchronization alignment and baseband signal adjustment on a baseband link by using a training frame. The data frame sending mode is a mode for normally sending the baseband signal. When the transmitting end is in the training frame adjusting mode, but not in the normal data frame transmitting mode, if the transmitting end does not switch the training frame adjusting mode to the data frame transmitting mode after completing the delay adjustment, each path of baseband link will continue to transmit data in the form of training frames, and the training frames are used as the specified format for adjusting the communication signals, and the transmitted baseband signals do not have real meanings, and the normal communication function cannot be maintained. Therefore, the transmitting end needs to switch the training frame adjustment mode of the baseband link to the data frame transmission mode, and meanwhile, after the transmitting end is switched to the data frame transmission mode, the receiving end does not need to maintain the training frame adjustment mode, and the data frame transmission mode of the transmitting end can be synchronized to the receiving end as long as the transmitting end is switched to the data frame transmission mode.
The specific implementation of the signal adjustment system of the present invention is substantially the same as the embodiments of the symbol synchronization method, and is not described herein again.
The present invention also provides a computer readable storage medium storing one or more programs, the one or more programs further executable by one or more processors for:
the method comprises the steps that a sending end takes any baseband link as a first reference path, and frame structure parameters of other baseband links of the sending end are adjusted respectively based on the frame structure parameters of the first reference path;
the sending end takes any adjusted baseband link as an adjusting path, and respectively calculates time delay between other baseband links and the adjusting path based on frame structure parameters of the adjusting path;
and the sending end performs symbol synchronization on the frame structure parameters of all the baseband links according to the time delay between all other baseband links and the adjusting path.
The specific implementation of the computer-readable storage medium of the present invention is substantially the same as the embodiments of the symbol synchronization method and the signal adjustment system, and is not described herein again.
It should be noted that, in this document, 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 one of 8230, and" comprising 8230does not exclude the presence of additional like elements in a process, method, article, or apparatus comprising the element.
The above-mentioned serial numbers of the embodiments of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.
Through the description of the foregoing embodiments, it is clear to those skilled in the art that the method of the foregoing embodiments may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better implementation. Based on such understanding, the technical solutions of the present invention or portions thereof contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.
Claims (10)
1. A symbol synchronization method based on a transmitting end is characterized in that the symbol synchronization method based on the transmitting end comprises the following steps:
the method comprises the steps that a sending end takes any baseband link as a first reference path, and frame structure parameters of other baseband links of the sending end are adjusted respectively based on the frame structure parameters of the first reference path;
the sending end takes any adjusted baseband link as an adjusting path, and respectively calculates the time delay between other baseband links and the adjusting path based on the frame structure parameters of the adjusting path;
and the sending end performs symbol synchronization on the frame structure parameters of all the baseband links according to the time delay between all other baseband links and the adjusting path, wherein the frame structure parameters are the frame structure parameters of the training frame.
2. The method for symbol synchronization based on the transmitting end according to claim 1, wherein the step of the transmitting end using any baseband link as the first reference path and adjusting the frame structure parameters of other baseband links of the transmitting end based on the frame structure parameters of the first reference path respectively comprises:
the method comprises the steps that a sending end takes any baseband link as a first reference path and sends heartbeat signals and parameter information to other baseband links of the sending end;
a sending end acquires target parameter information which is sent to a first reference path by other baseband links based on heartbeat signals and parameter information;
and the transmitting end performs symbol offset on the second sequences in other baseband links based on the target parameter information and the first sequence of the first reference path to maintain that the first sequences and the second sequences of other baseband links are staggered in each baseband link.
3. The method for symbol synchronization based on a transmitting end according to claim 1, wherein the step of symbol synchronization of the frame structure parameters of all baseband links by the transmitting end according to the time delay between all other baseband links and the adjusting path further includes:
the transmitting end transmits the proofreading information to the receiving end based on the baseband link completing the symbol synchronization so that the receiving end can calculate the symbol deviation value;
and the sending end adjusts the time delay of all baseband links of the sending end according to the symbol deviant value fed back by the receiving end.
4. The method for symbol synchronization based on a transmitting end according to claim 3, wherein the step of the transmitting end adjusting the time delays of all baseband links of the transmitting end according to the symbol offset value fed back by the receiving end further comprises:
the sending end detects whether all baseband links receive the symbol deviant fed back by the receiving end;
and when all the base band links of the sending end do not receive the symbol deviant fed back by the receiving end, re-acquiring the symbol deviant fed back by the receiving end.
5. The method for symbol synchronization based on the transmitting end according to claim 3, wherein the step of the transmitting end adjusting the time delays of all baseband links of the transmitting end according to the symbol offset value fed back by the receiving end comprises:
a sending end acquires all symbol deviant values fed back by a receiving end and maps all the symbol deviant values to corresponding baseband links;
and the sending end adjusts the time delay of all corresponding baseband links based on the symbol deviation value and a preset error, wherein the preset error is a time delay jitter error generated by data communication among the baseband branches.
6. The transmit-end based symbol synchronization method of claim 3, wherein the transmit end is in a training frame adjustment mode,
the step of adjusting the time delays of all baseband links at the transmitting end by the transmitting end according to the symbol deviation value fed back by the receiving end further comprises:
the transmitting end switches the base band link from the training frame adjusting mode to the data frame transmitting mode and synchronizes the data frame transmitting mode to the receiving end.
7. A symbol synchronization method based on a receiving end is characterized in that the symbol synchronization method based on the receiving end comprises the following steps:
the receiving end receives the proofreading information of all the baseband links sent by the sending end;
the receiving end takes any baseband link as a second reference path, and respectively calculates the symbol deviation values of other baseband links and the second reference path according to the proofreading information;
and the receiving end feeds back the symbol deviation value to a corresponding baseband link in the transmitting end, wherein the calibration information is reference data for calculating the symbol deviation value by the receiving end.
8. The receiving-end-based symbol synchronization method as claimed in claim 7, wherein the symbol offset value is calculated from a symbol offset of the calibration information of the baseband link and an error offset during symbol transmission.
9. A signal adjustment system, characterized in that, the signal adjustment system includes a transmitting end and a receiving end, the transmitting end includes:
the first adjusting module is used for adjusting the frame structure parameters of other baseband links of the sending end by taking any baseband link as a first reference path based on the frame structure parameters of the first reference path;
the first calculation module is used for calculating time delay between other baseband links and the adjustment path respectively based on the frame structure parameters of the adjustment path by taking any adjusted baseband link as the adjustment path;
the synchronization module is used for carrying out symbol synchronization on the frame structure parameters of all the baseband links according to the time delay between all other baseband links and the adjustment path;
a sending module, configured to send the calibration information to the receiving end based on the baseband link that completes symbol synchronization;
the second adjusting module is used for adjusting the time delay of all baseband links at the sending end according to the symbol deviant fed back by the receiving end, wherein the frame structure parameter is a frame structure parameter of the training frame;
the receiving end includes:
the receiving module is used for receiving the proofreading information of all the baseband links sent by the sending end;
the second calculation module is used for taking any baseband link as a second reference path and respectively calculating symbol deviation values of other baseband links and the second reference path according to the proofreading information;
and the feedback module is used for feeding back the symbol deviation value to a corresponding baseband link in the sending end, wherein the proofreading information is reference data for calculating the symbol deviation value by the receiving end.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a symbol synchronization program, which when executed by a processor implements the steps of the transmitting-side based symbol synchronization method of any one of claims 1 to 6 and the receiving-side based symbol synchronization method of any one of claims 7 to 8.
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