CN115102574B - Incoherent spread spectrum signal rapid acquisition synchronization method based on self-adaptive threshold adjustment - Google Patents
Incoherent spread spectrum signal rapid acquisition synchronization method based on self-adaptive threshold adjustment Download PDFInfo
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- CN115102574B CN115102574B CN202210694504.2A CN202210694504A CN115102574B CN 115102574 B CN115102574 B CN 115102574B CN 202210694504 A CN202210694504 A CN 202210694504A CN 115102574 B CN115102574 B CN 115102574B
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- 238000001514 detection method Methods 0.000 claims abstract description 42
- 230000003044 adaptive effect Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 abstract description 8
- 238000004088 simulation Methods 0.000 abstract description 5
- 230000001427 coherent effect Effects 0.000 abstract description 3
- 230000001360 synchronised effect Effects 0.000 abstract description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7075—Synchronisation aspects with code phase acquisition
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- H04B17/30—Monitoring; Testing of propagation channels
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- H04B17/3911—Fading models or fading generators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3912—Simulation models, e.g. distribution of spectral power density or received signal strength indicator [RSSI] for a given geographic region
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Abstract
The invention discloses a quick acquisition synchronization method of incoherent spread spectrum signals based on self-adaptive threshold adjustment, and relates to the field of broadband anti-interference and hidden satellite communication. According to the method, several signal-to-noise ratios are selected according to the application of an actual satellite channel, threshold setting under the condition of several signal-to-noise ratios is obtained according to the simulation of receiver parameters, then a threshold detection module is utilized to judge a proper capture threshold so as to facilitate quick capture, and the problem that the synchronization time is long due to repeated false locking when the capture threshold with the threshold signal-to-noise ratio is adopted for judging signals with high signal-to-noise ratio is prevented. The invention can realize rapid and accurate acquisition, and is particularly suitable for the condition of high requirement on synchronous time in a satellite receiving system of incoherent and coherent spread spectrum communication.
Description
Technical Field
The invention relates to the field of broadband anti-interference and hidden satellite communication, in particular to a method for rapidly capturing and synchronizing incoherent spread spectrum signals based on self-adaptive threshold adjustment, which is suitable for the condition of high requirement on synchronizing time in a spread spectrum satellite communication system.
Background
Fading of the highly dynamic channel causes the power of the received signal to change as well as other disturbances in the system. Thus, the signal-to-noise ratio of the received signal will vary within a certain range, and if a fixed threshold is used, the acquisition performance of the system will deteriorate at high signal-to-noise ratios. An adaptive adjustment strategy is required.
The signal-to-noise ratio range in the spread spectrum communication system is larger, the probability of realizing correct acquisition synchronization of the signal is related to a set threshold, the set threshold is higher or missed acquisition occurs, and error acquisition is possibly caused by low set threshold, so that it is important to set an accurate and reasonable threshold. Too high a setting of the acquisition threshold would miss the alarm and too low would easily generate false alarms. The setting of the general acquisition threshold of the traditional spread spectrum receiver is realized according to the threshold of correct acquisition under the threshold signal-to-noise ratio, and the receiver often does not work under the threshold signal-to-noise ratio in the realization process, but sometimes has higher working signal-to-noise ratio, and the acquisition threshold under the threshold signal-to-noise ratio is used as the acquisition threshold under the condition, so that the acquisition due to errors is easy to cause, and the synchronization time of the receiver is prolonged.
Disclosure of Invention
In view of this, the invention provides a method for rapidly capturing and synchronizing incoherent spread spectrum signals based on adaptive threshold adjustment, which solves the problem that the capturing threshold under the condition of fixed low signal to noise ratio can cause the repeated error locking of demodulation signals to cause long synchronization time under the condition of high signal to noise ratio, and the threshold detection can be realized by any capturing mode capable of realizing pseudo code synchronization algorithm, thereby having good flexibility.
The purpose of the invention is realized in the following way:
a non-coherent spread spectrum signal rapid acquisition synchronization method based on self-adaptive threshold adjustment comprises the following steps:
(1) Selecting N-gear signal-to-noise ratio from high to low, wherein the signal-to-noise ratio of the lowest gear is set as a threshold signal-to-noise ratio;
(2) According to the set N-gear signal-to-noise ratio and the capturing length, simulating power values of the local code word and the related accumulated value of the receiving end spread spectrum data to obtain N power values as corresponding detection threshold values under the N-gear signal-to-noise ratio;
(3) Setting a threshold detection module, detecting the capture threshold of the spread spectrum signal received under the current signal-to-noise ratio by the threshold detection module when the capture is started or the capture is performed after the step-out, and selecting the best capture threshold under the current signal-to-noise ratio;
(4) The optimal threshold obtained by the threshold detection module is used as a capture threshold to carry out pseudo code capture, so that the quick coarse synchronization of incoherent spread spectrum signals is realized;
and completing the quick acquisition synchronization of incoherent spread spectrum based on adaptive threshold adjustment.
Further, in the step (1), the value range of N is 4-6.
Further, in the step (3), the threshold detection module is implemented by the pseudo code capturing module, and the threshold detection module uses two adjacent detections to meet the capturing threshold as a decision basis.
Further, in step (3), the threshold detection module detects the capture threshold of the spread spectrum signal received under the current signal-to-noise ratio, which specifically includes:
Sequentially detecting the N power values from high to low until the threshold detection module detects signal information, wherein the power value used by the threshold detection module is the optimal threshold; meanwhile, a signal-to-noise ratio range of a received signal is obtained in the threshold detection process, and the channel condition is estimated according to the signal-to-noise ratio range.
Compared with the background technology, the invention has the following advantages:
(1) The invention sets the corresponding power detection threshold under the grading signal-to-noise ratio, detects the related power by using a plurality of thresholds before capturing, obtains the best threshold of capturing according to a certain strategy, improves the capturing probability and shortens the synchronization time.
(2) The invention can avoid the problem of long synchronization time caused by repeated false locking when the acquisition threshold of the threshold signal-to-noise ratio is low under the condition of high signal-to-noise ratio, can realize quick acquisition, and can also know the current channel condition through threshold detection so as to adjust the communication mode or rate and the like to adapt to the channel condition to realize reliable communication.
Detailed Description
The present invention will be described in further detail below.
A quick capture synchronization method of incoherent spread spectrum based on self-adaptive threshold adjustment comprises the following steps:
(1) Selecting N-gear signal-to-noise ratio, wherein the N-gear signal-to-noise ratio is set from high to low at a certain interval; wherein, the lowest gear signal-to-noise ratio is set as a threshold signal-to-noise ratio;
Obtaining a plurality of relevant accumulated power value filters of codewords and received data under different signal-to-noise ratios through simulation according to set conditions, and meeting the requirements by using 4 to 5 signal-to-noise ratio files according to operation complexity and simulation results;
(2) Simulating the correlation values according to the set N-gear signal-to-noise ratio and the capturing length to obtain N correlation values as corresponding threshold detection values under the N-gear signal-to-noise ratio;
And selecting other signal-to-noise ratio gears in certain steps by taking the actually required signal-to-noise ratio threshold value as the lowest gear signal-to-noise ratio, and carrying out simulation according to the selected signal-to-noise ratio gears. Specifically, for a signal-to-noise ratio of a certain gear, a power value of a local codeword and a relevant accumulated value of the spread spectrum data of a receiving end under the signal-to-noise ratio condition is obtained, and the power value is used as a capture threshold under the signal-to-noise ratio gear. The signal-to-noise ratio steps between adjacent gears are adjustable, and the steps may be fixed or variable.
(3) Setting a threshold detection module, detecting the capture threshold of the spread spectrum signal received under the current signal-to-noise ratio according to a certain strategy when the capture is started or the capture is performed after the step-out, and selecting the best capture threshold under the current signal-to-noise ratio;
the threshold detection module can be the same as the capture module, the power detection module is started to detect the capture threshold before the capture module is started, and the capture threshold suitable for the channel condition is determined for the capture module by taking the two adjacent detections and meeting the capture threshold as decision basis.
The related accumulated value power detection module is started before the acquisition module when the acquisition module is started each time, and the strategy according to the threshold detection is as follows: firstly, detecting according to a capture threshold set under the highest-grade signal-to-noise ratio, if the detection is qualified under the threshold, using the threshold to carry out subsequent capture, otherwise, detecting according to a capture threshold set under the next highest-grade signal-to-noise ratio, if the detection is qualified, using the threshold to carry out subsequent capture; otherwise, if the detection fails, continuing to detect according to the capture threshold set under the third-gear signal-to-noise ratio, and if the detection is qualified, using the threshold to carry out subsequent capture; otherwise, the detection fails, and the capture threshold set under the lowest signal-to-noise ratio is used for detection. Meanwhile, the acquisition threshold detection may reflect the current channel condition to some extent. Providing basis for parameter selection of the subsequent demodulation module, and facilitating engineering realization.
A round of threshold detection is required each time before the acquisition module is started, a certain time is required, the time is related to the signal to noise ratio, and the higher the signal to noise ratio is, the shorter the time is required. The time is much shorter than the time required for the repeated final synchronization of capturing, error locking, resynchronization and the like by using the threshold signal-to-noise ratio threshold under the condition of high signal-to-noise ratio, and the method is particularly suitable for being used under the condition of high signal-to-noise ratio.
(4) The acquisition module takes the optimal threshold obtained by the threshold detection module as an acquisition threshold to carry out pseudo code acquisition, so as to realize quick coarse synchronization of incoherent spread spectrum signals;
The selection of the capturing module can be flexible, serial sliding correlation capturing can be used, parallel matched filtering capturing can be used, and PMF-FFT (partial matched filtering based on FFT) and other modules can be used for capturing.
In a word, the method selects several signal-to-noise ratios according to the application of the actual satellite channel, obtains the threshold setting under the condition of several signal-to-noise ratios according to the parameter simulation of the receiver, then judges the proper acquisition threshold by utilizing the threshold detection module to help to quickly realize acquisition, and prevents the problem of long synchronization time caused by repeated false locking when the acquisition threshold adopting the threshold signal-to-noise ratio is adopted for judging the signal with high signal-to-noise ratio. The invention can realize rapid and accurate acquisition, and is particularly suitable for the condition of high requirement on synchronous time in a satellite receiving system of incoherent and coherent spread spectrum communication.
Claims (3)
1. The incoherent spread spectrum signal rapid acquisition synchronization method based on self-adaptive threshold adjustment is characterized by comprising the following steps:
(1) Selecting N-gear signal-to-noise ratio from high to low, wherein the signal-to-noise ratio of the lowest gear is set as a threshold signal-to-noise ratio;
(2) According to the set N-gear signal-to-noise ratio and the capturing length, simulating power values of the local code word and the related accumulated value of the receiving end spread spectrum data to obtain N power values, wherein the N power values are used as corresponding detection threshold values under the N-gear signal-to-noise ratio;
(3) Setting a threshold detection module, detecting the capture threshold of the spread spectrum signal received under the current signal-to-noise ratio by the threshold detection module when the signal is initially captured or captured after the step-out, and selecting the best capture threshold under the current signal-to-noise ratio; the method comprises the following steps of:
Sequentially detecting the N power values from high to low until the threshold detection module detects signal information, wherein the power value used by the threshold detection module is the optimal threshold; meanwhile, a signal-to-noise ratio range of a received signal is obtained in a threshold detection process, and channel conditions are estimated according to the signal-to-noise ratio range;
(4) The optimal threshold obtained by the threshold detection module is used as a capture threshold to carry out pseudo code capture, so that the quick coarse synchronization of incoherent spread spectrum signals is realized;
and completing the quick acquisition synchronization of incoherent spread spectrum based on adaptive threshold adjustment.
2. The method for rapidly acquiring and synchronizing incoherent spread spectrum signals based on adaptive threshold adjustment according to claim 1, wherein in the step (1), the value range of N is 4-6.
3. The method for rapidly acquiring and synchronizing incoherent spread spectrum signals based on adaptive threshold adjustment according to claim 1, wherein in the step (3), the threshold detection module is implemented by a pseudo code acquisition module, and the threshold detection module uses two adjacent detections while meeting the acquisition threshold as a decision basis.
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| CN114221674A (en) * | 2021-12-06 | 2022-03-22 | 西北工业大学 | Spread spectrum signal rate self-adaptive capturing method |
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| US7158559B2 (en) * | 2002-01-15 | 2007-01-02 | Tensor Comm, Inc. | Serial cancellation receiver design for a coded signal processing engine |
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