CN113890641A - Multipath signal fusion method - Google Patents
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- CN113890641A CN113890641A CN202111127226.4A CN202111127226A CN113890641A CN 113890641 A CN113890641 A CN 113890641A CN 202111127226 A CN202111127226 A CN 202111127226A CN 113890641 A CN113890641 A CN 113890641A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
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Abstract
The invention discloses a multi-path signal fusion method, which comprises the following steps: s1, receiving a plurality of input signals; s2, correspondingly storing the field intensity signal and the frame signal; s3, opening a frame header detection window; s4, if the frame header is recognized, recording the arrival time of the input signal, and simultaneously storing the field intensity signal and the frame signal; s5, closing if the frame header detection window time is over; s6, placing the effective signals to be aligned at the same starting time; s7, comparing the field intensity signals in the effective signal group bit by bit, and selecting one path of frame signal with the maximum field intensity signal as the optimal bit signal on each bit signal; and S8, merging and fusing all the optimal bit signals in sequence to form a new frame signal. The invention compares the field intensity of the multi-channel signals, finds out the frame signal corresponding to the maximum value of the field intensity of the same position after alignment, and then fuses the signals to obtain the optimal frame signal, thereby improving the accuracy of the received signal and ensuring the integrity and the reliability of the signal.
Description
Technical Field
The invention belongs to the technical field of multi-channel signal fusion in the field of wireless communication, and particularly relates to a multi-channel signal fusion method.
Background
The multipath signal fusion technique is a signal processing method for improving the quality of a received signal and compensating for fading loss in a channel. The method is realized by using a mode of multiple receiving and transmitting channels, and the transmission efficiency of the channels can be improved by processing multiple signals by a receiving end.
The multi-channel signal fusion technology refers to a signal processing technology for rapidly analyzing and integrating a plurality of acquired information under a certain criterion to enable signals to meet corresponding requirements. The basic principle is that signals carrying the same information and transmitted through multiple channels carry different transmission characteristics of each channel, and the fading of the signals is different. The fading is generally sporadic and independent from each other, which causes different fading to occur for signals transmitted through the same channel. If the signal fusion technology is not used for signal processing, no matter which signal is selected, sudden attenuation of the signal may exist at a certain position, and unpredictable information loss is caused. Especially in the wireless communication scene with complex signal sources and various channels, the signal fusion technology can be adopted to improve the transmission quality of the wireless communication channel, avoid the phenomenon of information loss in the received signal to the maximum extent and meet the high requirement of communication on the received signal. Therefore, the multi-path signal fusion technology is very important for improving the signal quality and has wide application prospect.
The multi-channel signal fusion is a signal processing method that a receiving end carries out preprocessing (windowing synchronization) on collected multi-channel signals carrying the same information, and then carries out reprocessing according to field intensity signals (representing the fading degree of the signals) corresponding to each channel of signals, so as to avoid information loss in a single channel of signals. The fusion is divided into judgment analysis and information combination. The judgment analysis is to enable the receiving end to rapidly carry out specific processing on the multi-channel signals with statistical independence based on the field intensity signals. Combining refers to preferentially cutting out the specifically processed signals and combining the signals into the received signal with the highest accuracy in a short time to reduce the influence of fading.
Most of the conventional receiving modes select a certain single-path signal with the highest matching degree as receiving through a receiving end, and the interference of channel fading on the received signal can be reduced through optimal matching to a certain extent. But because of the bursty nature of channel fading, there is inevitably a problem of unreliable signals or information loss somewhere in the matched received signal. In addition, a certain processing time is required to obtain a signal of higher quality. In some communication scenes with strict requirements, the defects of the traditional receiving mode are gradually revealed, and the application requirements cannot be met.
Disclosure of Invention
The invention aims to solve the problems of strong dependence on channel quality, low signal recovery quality, poor signal processing timeliness, unpredictable information loss caused by channel fast attenuation and the like in the prior art, and provides a multi-channel signal fusion method which simultaneously receives multi-channel signals, compares the field strengths of the multi-channel signals, finds out a frame signal corresponding to the maximum value of the field strength of each bit signal, then fuses each bit signal to obtain an optimal frame signal, improves the accuracy of the received signals, and ensures the integrity and the reliability of the signals.
The purpose of the invention is realized by the following technical scheme: a method of multi-path signal fusion, comprising the steps of:
s1, receiving a plurality of input signals;
s2, carrying out down-conversion and filtering amplification processing on the received input signals, then demodulating to obtain frame signals, simultaneously obtaining the field intensity signals of each path of input signals through field intensity signal capture, and correspondingly storing the field intensity signals of each path of input signals and the frame signals;
s3, detecting each path of frame signals, taking the frame header signal identified firstly in all the frame signals as a starting time point, and opening a frame header detection window;
s4, judging whether the frame head is identified by the rest of the frame signals, if so, recording the arrival time of the input signal, and simultaneously storing the field intensity signal of the input signal and the frame signal as an effective signal; if the frame head is not identified by a certain path of signal, the path of signal is taken as an invalid signal and does not participate in processing;
s5, judging whether the time of the frame header detection window is finished, if so, closing the frame header detection window, otherwise, returning to the step S4 to continue the detection;
s6, placing the received effective signals at the same starting time to form an aligned effective signal group;
s7, comparing the field intensity signals in the effective signal group bit by bit, selecting one path of frame signal with the maximum field intensity signal as the optimal bit signal on each bit signal, and discarding the bit signals of the other paths as inferior bit signals;
and S8, from the first bit signal, merging and fusing all the optimal bit signals in sequence to form a new optimal frame signal.
The invention has the beneficial effects that: the multi-channel signal fusion technology based on the field intensity signal intensity provided by the invention overcomes the problems of strong dependence on channel quality, low signal recovery quality, poor signal processing timeliness, unpredictable information loss caused by channel fast attenuation and the like in the traditional receiving technology. The frame signals corresponding to the maximum field intensity of each bit signal are found out by simultaneously receiving the multi-channel signals and comparing the field intensities of the multi-channel signals, then the bit signals are fused to obtain the optimal frame signals, and for channel data with individual information loss, the optimal frame signals can be obtained through the data of other channels, so that the accuracy of the received signals is improved, and the integrity and the reliability of the signals are ensured.
Drawings
FIG. 1 is a schematic view of a usage scenario of the present invention;
FIG. 2 is a flow chart of a multi-path signal fusion method of the present invention;
FIG. 3 is a schematic diagram of signal processing according to the present invention;
FIG. 4 is a schematic diagram of an aligned valid signal set according to the present invention;
FIG. 5 is a schematic diagram of the signal fusion process of the present invention;
FIG. 6 shows the fused signal of the present invention.
Detailed Description
The invention aims to communicate between a ground base station and a train antenna through a wireless network in a mobile wireless communication system, especially in an application scene with strict requirements on the quality of a received signal, such as a communication scene between the ground base station and a train shown in figure 1. The multi-channel signal fusion is realized by detecting the field intensity signal, and the communication quality is improved in a short time. The train-to-ground base station communication process is similar.
The invention is realized by the following preconditions: 1. the system has multiple receiving channels to form multiple receiving signals with same information; 2. information in a wireless communication system is transmitted in a frame format, and a frame header is used as an identification and synchronization identifier; 3. the field intensity signal corresponding to each path of signal can be detected as a judgment basis.
The technical scheme of the invention is further explained by combining the attached drawings.
As shown in fig. 2, the implementation process of the multi-channel signal fusion method of the present invention is mainly divided into two parts, when the receiving end needs to perform multi-channel signal fusion, firstly preprocessing the received signals transmitted through multiple different channels, merging the signals into high quality signals after data fusion, and transmitting the signals to the next stage;
the preprocessing is a precondition for realizing the multi-channel signal fusion technology, and mainly comprises received signal demodulation, field intensity signal detection and synchronous alignment of effective signals. The main purpose is to facilitate the subsequent processing and supplementation of each bit of the multi-channel frame signal. The method comprises the following steps:
s1, receiving a plurality of input signals;
s2, down-converting, filtering, amplifying and demodulating the received input signals to obtain frame signals, capturing the field strength signals to obtain field strength signals of each input signal, and storing the field strength signals of each input signal and the frame signals correspondingly, as shown in fig. 3;
s3, setting multiple paths of signals carrying the same information to reach a receiving end, detecting each path of frame signals, taking the frame header signal identified firstly in all the frame signals as a starting time point, and opening a frame header detection window; the size of the frame header detection window can be determined according to the actual application scene;
s4, judging whether the frame head is identified by the rest of the frame signals, if so, recording the arrival time of the input signal, and simultaneously storing the field intensity signal of the input signal and the frame signal as an effective signal; if the frame header is not identified in a certain path of signal, the path of signal is taken as an invalid signal and does not participate in processing, as shown in fig. 4;
s5, judging whether the time of the frame header detection window is finished, if so, closing the frame header detection window, otherwise, returning to the step S4 to continue the detection;
s6, placing the received effective signals at the same starting time to form an aligned effective signal group;
the data fusion is a reprocessing part of the multi-path signal fusion, and the main purpose is to judge and analyze each bit of the aligned effective signal group after the preprocessing. Due to the independence and the burst of the fast attenuation of the channel, the field intensity corresponding to the received signals of different paths is different, and the field intensity corresponding to the received signals of different positions of the same path is also different. And the receiving end detects in parallel, screens out multiple paths of effective signals containing the same information, and simultaneously captures a field intensity signal corresponding to each path of effective signal. Then, the multi-channel signals are fused through the field intensity signals, and the method specifically comprises the following steps:
s7, comparing the field strength signals in the effective signal group bit by bit, selecting one channel of frame signal with the largest field strength signal as the optimal bit signal and the other channels of bit signals as inferior bit signals to discard on each bit signal, as shown in fig. 5;
s8, merging and fusing all the optimal bit signals in sequence from the first bit signal to form a new optimal frame signal, where the fused signal is shown in fig. 6.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (1)
1. A method for multi-path signal fusion, comprising the steps of:
s1, receiving a plurality of input signals;
s2, carrying out down-conversion and filtering amplification processing on the received input signals, then demodulating to obtain frame signals, simultaneously obtaining the field intensity signals of each path of input signals through field intensity signal capture, and correspondingly storing the field intensity signals of each path of input signals and the frame signals;
s3, detecting each path of frame signals, taking the frame header signal identified firstly in all the frame signals as a starting time point, and opening a frame header detection window;
s4, judging whether the frame head is identified by the rest of the frame signals, if so, recording the arrival time of the input signal, and simultaneously storing the field intensity signal of the input signal and the frame signal as an effective signal; if the frame head is not identified by a certain path of signal, the path of signal is taken as an invalid signal and does not participate in processing;
s5, judging whether the time of the frame header detection window is finished, if so, closing the frame header detection window, otherwise, returning to the step S4 to continue the detection;
s6, placing the received effective signals at the same starting time to form an aligned effective signal group;
s7, comparing the field intensity signals in the effective signal group bit by bit, selecting one path of frame signal with the maximum field intensity signal as the optimal bit signal on each bit signal, and discarding the bit signals of the other paths as inferior bit signals;
and S8, from the first bit signal, merging and fusing all the optimal bit signals in sequence to form a new optimal frame signal.
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2021
- 2021-09-26 CN CN202111127226.4A patent/CN113890641A/en active Pending
Patent Citations (7)
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Application publication date: 20220104 |