Blind phase estimation method and system of high-speed frequency hopping system

Abstract

The invention relates to a blind phase estimation method and system for a high-speed frequency hopping system, and the method comprises the steps: a receiving end carries out the capturing of a synchronization hop according to a synchronization code, and determines the synchronization time of the frequency hopping system; determining the position of a data symbol in each data hop according to the synchronization time, and selecting N unknown data symbols to participate in phase estimation; except the necessary fixed overhead of the data hop, the rest time is used for transmitting the data; for binary digital modulation, N original bits corresponding to N unknown data symbols have K possible valuing modes, K is equal to 2N, a local modulation signal of each valuing mode and a received signal corresponding to the position are subjected to correlation operation, a possible phase estimation value is obtained, and K phase estimation values are obtained in total; and finding an optimal value from the K phase estimation values. According to the invention, the phase estimation function can be completed without inserting a pilot frequency sequence, the transmission overhead is saved, the user requirement of high-speed information is met, and the coding gain and the system performance are improved at the same time.

Description

Technical Field

[0001] The present invention belongs to the field of communication technology, and in particular relates to a blind phase estimation method and system for a high-speed frequency hopping system. Background Art

[0002] In wireless communication systems, the receiver mixes the input signal with the output signal of the frequency synthesizer and converts it to a relatively low intermediate frequency. For an ideal receiver, these frequency conversions will not distort the input signal. However, for an actual receiver, the non-ideal factors of the local oscillator and the frequency synthesizer will distort the input signal and form a phase offset, thereby reducing the demodulation performance of the receiver. Therefore, it is necessary to estimate the phase offset of each data hop at the receiving end, and then recover the phase of the data to improve the communication performance of the system. The traditional technical method is to insert a certain number of pilot sequences in each data hop for phase estimation.

[0003] High-speed frequency hopping system is an effective technical means to avoid frequency tracking interference. The dwell time of each hop of this system is short, and high-speed transmission is an important user demand in communication. In order to ensure that data transmission has a certain coding gain, it is necessary to reduce the additional overhead in the short dwell time. Usually, the pilot sequence needs to be sent for each data hop to complete the phase estimation, which increases the transmission overhead and reduces the information transmission rate. Therefore, the traditional technical method of inserting pilots cannot meet the user demand for high-speed information transmission in high-speed frequency hopping systems. Summary of the invention

[0004] The purpose of the present invention is to provide a blind phase estimation method and system for a high-speed frequency hopping system, which can complete the phase estimation function without inserting a pilot sequence, save transmission overhead, meet the user needs of high-speed information, and simultaneously improve the coding gain, effectively improving the system performance.

[0005] The present invention provides a blind phase estimation method for a high-speed frequency hopping system, comprising the following steps:

[0006] Step 1, the receiving end performs synchronization hopping capture according to the synchronization code and determines the synchronization time of the frequency hopping system;

[0007] Step 2, determining the position of the data symbol in each data hop according to the synchronization time, and selecting N unknown data symbols to participate in phase estimation; the data hop removes necessary fixed overhead including power up and power down of X symbol lengths, and frequency switching time of Y symbol lengths, and the rest of the time is used for data transmission;

[0008] Step 3: For binary digital modulation, the N original bits corresponding to the N unknown data symbols have K possible value modes, K = 2 N, the local modulation signal of each value mode is correlated with the received signal corresponding to the position to obtain a possible phase estimation value, and a total of K phase estimation values ​​are obtained;

[0009] Step 4: Find the best value from the K phase estimation values.

[0010] Furthermore, the method for finding the optimal value in step 4 is:

[0011] The correlation power between each local modulation signal and the received signal corresponding to the position is calculated. The phase estimation value corresponding to the maximum correlation power is the optimal phase estimation value. The phase estimation value is used to perform phase recovery operation on the received signal and complete the subsequent demodulation processing.

[0012] Furthermore, the method for finding the optimal value in step 4 is:

[0013] Use each phase estimation value to perform phase recovery operation on the received signal, and complete the subsequent demodulation processing respectively. The absolute value and the absolute value of the soft information output by each demodulation are calculated as the reliability measure. The maximum metric value is found from the K metric values, and its corresponding demodulation result is taken as the best demodulation result.

[0014] The present invention also provides a blind phase estimation system for a high-speed frequency hopping system, comprising a blind phase estimation module, wherein the blind phase estimation module executes the blind phase estimation method for the high-speed frequency hopping system.

[0015] The present invention also provides a non-transitory computer-readable storage medium, which stores computer instructions. When the computer instructions are executed by a processor, the blind phase estimation method of the high-speed frequency hopping system is implemented.

[0016] The present invention also provides an electronic device, comprising:

[0017] A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the blind phase estimation method for a high-speed frequency hopping system by executing the computer instructions.

[0018] By means of the above scheme, the blind phase estimation method and system of the high-speed frequency hopping system have the following technical effects:

[0019] 1) Phase estimation can be performed without transmitting a pilot sequence, which saves channel bandwidth and effectively improves the information transmission rate, making it particularly suitable for high-speed frequency hopping systems.

[0020] 2) The accuracy of phase estimation is no longer limited by the length of the pilot signal, and the appropriate length can be selected in the data part for phase estimation according to the actual accuracy requirements.

[0021] 3) It does not increase the additional hardware cost. By adding software modules, phase estimation can be effectively performed to improve the communication performance of the high-speed frequency hopping system.

[0022] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a flow chart of the blind phase estimation method of the high-speed frequency hopping system of the present invention;

[0024] Figure 2 This is a schematic diagram of the data jump structure of the present invention;

[0025] Figure 3 A flowchart of the first solution for finding the optimal value in the present invention;

[0026] Figure 4 A flowchart of the second solution for finding the optimal value in the present invention;

[0027] Figure 5 The figure is a schematic structural diagram of an electronic device of the present invention. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] Ginseng Figure 1 As shown, this embodiment provides a blind phase estimation method for a high-speed frequency hopping system, comprising the following steps:

[0030] Step S1: The receiving end captures the synchronization hopping according to the synchronization code and determines the synchronization time of the frequency hopping system.

[0031] Step S2: Determine the position of the data symbol in each data hop according to the synchronization time, and select N unknown data symbols to participate in phase estimation. The larger the value of N, the more accurate the phase estimation result, but the amount of calculation will also increase. The data hop structure is as follows: Figure 2 As shown, the data hop excludes the necessary fixed overhead including power up and power down of X symbol lengths and frequency switching time of Y symbol lengths, and the rest of the time is used for data transmission.

[0032] Step S3: For binary digital modulation, the N original bits corresponding to the N unknown data symbols have K possible value modes, K=2 N, a correlation operation is performed between the local modulated signal of each value taking mode and the received signal corresponding to the position to obtain a possible phase estimation value, and a total of K phase estimation values ​​are obtained.

[0033] Step S4: Find the best value from the K phase estimation values. There are two solutions to choose from (the solution flow chart is as follows: Figure 3 , Figure 4 shown):

[0034] Solution 1: Calculate the correlation power between each local modulation signal and the received signal corresponding to the position. The phase estimation value corresponding to the maximum correlation power is the optimal phase estimation value. Use this phase estimation value to perform phase recovery operation on the received signal and complete subsequent demodulation processing.

[0035] Solution 2: Use each phase estimation value to perform phase recovery operation on the received signal, and complete the subsequent demodulation processing respectively. The absolute value and the absolute value of the soft information output by each demodulation are calculated as the reliability metric. The maximum metric value is found from the K metric values, and its corresponding demodulation result is taken as the best demodulation result.

[0036] The blind phase estimation method of the high-speed frequency hopping system has the following technical effects:

[0037] 1) Phase estimation can be performed without transmitting a pilot sequence, which saves channel bandwidth and effectively improves the information transmission rate, making it particularly suitable for high-speed frequency hopping systems.

[0038] 2) The accuracy of phase estimation is no longer limited by the length of the pilot signal, and the appropriate length can be selected in the data part for phase estimation according to the actual accuracy requirements.

[0039] 3) It does not increase the additional hardware cost. By adding software modules, phase estimation can be effectively performed to improve the communication performance of the high-speed frequency hopping system.

[0040] This embodiment further provides a blind phase estimation system for a high-speed frequency hopping system, including a blind phase estimation module, wherein the blind phase estimation module executes the blind phase estimation method for the high-speed frequency hopping system.

[0041] This embodiment also provides a non-transitory computer-readable storage medium, which stores computer instructions. When the computer instructions are executed by a processor, the blind phase estimation method for a high-speed frequency hopping system is implemented.

[0042] Ginseng Figure 5 As shown, this embodiment also provides an electronic device, including:

[0043] A memory 201 and a processor 202, wherein the memory 201 and the processor 202 are communicatively connected to each other, the memory 201 stores computer instructions, and the processor 202 executes the blind phase estimation method for a high-speed frequency hopping system by executing the computer instructions.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A blind phase estimation method for a high-speed frequency hopping system, characterized in that: The steps include: Step 1, the receiving end performs synchronization hopping capture according to the synchronization code and determines the synchronization time of the frequency hopping system; Step 2, determining the position of the data symbol in each data hop according to the synchronization time, and selecting N unknown data symbols to participate in phase estimation; the data hop removes necessary fixed overhead including power up and power down of X symbol lengths, and frequency switching time of Y symbol lengths, and the rest of the time is used for data transmission; Step 3: For binary digital modulation, the N original bits corresponding to the N unknown data symbols have K possible value modes, K = 2 N , the local modulation signal of each value mode is correlated with the received signal corresponding to the position to obtain a possible phase estimation value, and a total of K phase estimation values ​​are obtained; Step 4: Find the best value from the K phase estimation values.

2. The blind phase estimation method for a high-speed frequency hopping system according to claim 1, characterized in that: The method for finding the optimal value in step 4 is: The correlation power between each local modulation signal and the received signal corresponding to the position is calculated. The phase estimation value corresponding to the maximum correlation power is the optimal phase estimation value. The phase estimation value is used to perform phase recovery operation on the received signal and complete the subsequent demodulation processing.

3. The blind phase estimation method for a high-speed frequency hopping system according to claim 1, characterized in that: The method to find the optimal value in step 4 is: Use each phase estimation value to perform phase recovery operation on the received signal, and complete the subsequent demodulation processing respectively. The absolute value and the absolute value of the soft information output by each demodulation are calculated as the reliability measure. The maximum metric value is found from the K metric values, and its corresponding demodulation result is taken as the best demodulation result.

4. A blind phase estimation system for a high-speed frequency hopping system, characterized in that: It comprises a blind phase estimation module, which executes a blind phase estimation method for a high-speed frequency hopping system as described in any one of claims 1-3.

5. A non-transitory computer-readable storage medium, characterized in that: The non-transitory computer-readable storage medium stores computer instructions, and when the computer instructions are executed by a processor, a blind phase estimation method for a high-speed frequency hopping system as described in any one of claims 1 to 3 is implemented.

6. An electronic device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the blind phase estimation method for a high-speed frequency hopping system as described in any one of claims 1 to 3 by executing the computer instructions.

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