CN112737634A - Frequency hopping synchronization method suitable for PDT/DMR - Google Patents
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Abstract
The invention discloses a frequency hopping synchronization method suitable for PDT/DMR, and belongs to the technical field of wireless communication. The transmitting party forms a frequency hopping synchronous frame by the frequency hopping synchronous information through processes of link coding, synchronous word filling and the like and sends the frequency hopping synchronous frame to the receiving party through synchronous frequency points; the receiving party is in a slow scanning state before being unsynchronized, and can receive a complete frequency hopping synchronization frame when the frequency points of the receiving party are scanned to be consistent with the frequency points of the sending party; after receiving the frequency hopping synchronization frame, a receiver firstly searches the synchronization words embedded in the synchronization frame, determines the initial position of the burst, then extracts the effective load according to the initial position of the burst and decodes and restores the frequency hopping synchronization information; and the receiver switches to a synchronous following hop state according to the frequency hopping synchronous information and the judgment threshold to realize synchronous receiving. The invention designs the frequency hopping synchronization frame structure according to the PDT/DMR data link layer frame structure, so that the frequency hopping synchronization process is simple and quick, and the anti-interference capability of the PDT/DMR equipment is improved.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a frequency hopping synchronization method suitable for PDT/DMR.
Background
With the development of communication technology, the wireless communication equipment greatly facilitates daily life and work of people, especially mobile terminal equipment is not only widely applied to personal life, but also the requirements of various industries on the wireless communication equipment are more and more extensive, for example, the industries such as rail transit, security, public security, emergency and the like have more special requirements on special wireless communication equipment.
At present, a fixed frequency communication mode is generally adopted by private network wireless communication equipment, and the communication mode has the defects of poor anti-interference capability, easy natural interference such as internal noise of a receiver, multi-user interference and the like, and artificial interference such as partial frequency band interference, multi-frequency continuous wave interference and the like.
In order to improve the anti-interference capability of the wireless terminal equipment, a frequency hopping technology is introduced into a PDT/DMR conventional communication mode, and the advantage of the frequency hopping technology on the anti-interference capability is played. The technical difficulty of introducing frequency hopping into a relatively perfect communication protocol mainly lies in following the original communication system to the greatest extent, thereby having great limitation on the realization and promotion of technologies such as synchronization related to frequency hopping, frequency hopping rate and the like. Taking PDT standard protocol as an example, a time division multiple access frame structure is adopted, each frame comprises two time slots, the time length of each time slot is 30ms, and under the air interface waveform, the flexibility of frequency hopping rate is limited, and the degree of freedom of frequency hopping synchronization implementation mode design is influenced.
Disclosure of Invention
In view of this, the present invention provides a frequency hopping synchronization method suitable for PDT/DMR, which can implement frequency hopping synchronization without changing the empty waveform of PDT/DMR communication system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a frequency hopping synchronization method suitable for PDT/DMR comprises the following steps:
the method comprises the following steps: the transmitting party forms a frequency hopping synchronous frame by the frequency hopping synchronous information through the processes of link coding and synchronous word filling, and sends the frequency hopping synchronous frame to the receiving party through synchronous frequency points;
step two: the receiving party is in a slow scanning state before being unsynchronized, and receives a complete frequency hopping synchronization frame when the frequency hopping synchronization frame is consistent with the frequency point of the sending party;
step three: after receiving the frequency hopping synchronization frame, a receiver firstly searches the synchronization word embedded in the synchronization frame, determines the burst initial position, then extracts the effective load according to the burst initial position, and decodes and restores the frequency hopping synchronization information;
step four: and the receiver switches to a synchronous following hop state according to the frequency hopping synchronous information and the judgment threshold to realize synchronous receiving.
Further, the frequency hopping synchronization information in the first step includes:
real-time TOD for generating frequency hopping patterns and synchronous frequency point sequences;
a frequency hopping flag bit for indicating the receiver to switch the receiving state;
network number for networking.
Further, the frequency hopping synchronization frame in the first step includes a first transceiving switching protection time, a first frequency hopping synchronization information load, a frame synchronization word, a second frequency hopping synchronization information load, and a second transceiving switching protection time.
Furthermore, the number of the synchronous frequency points in the step one is N, N is more than or equal to 1 and less than or equal to 3, and a synchronous frequency point set { F is calculated through the mapping of the real-time TOD in the frequency hopping synchronous informationiAnd i =1 … N, and the transmitting party sequentially selects the synchronous frequency points in the synchronous frequency point set to transmit the frequency hopping synchronous frame.
Further, the specific manner of the slow scanning state in the second step is as follows:
the receiver scans circularly under the synchronous frequency point set, in order to make the frequency point of the receiver coincide with the frequency point of the sender at a certain time, the dwell time of each synchronous frequency point is longer than that of the sender, namely the scanning speed of the receiver is slower than that of the sender, and the scanning speed of the receiver is 1/(N +1) of that of the sender.
Furthermore, in the third step, the sync word is located in the middle of the time slot burst, the sync word and the position are detected by adopting a sliding correlation algorithm, and the initial position of the burst is determined according to the position of the sync word, so that frame synchronization is realized; then, frequency hopping synchronous information in the effective load is extracted step by step, and the frequency hopping synchronous information is restored through link decoding.
Furthermore, in the fourth step, the decision threshold is a decision logic for the receiver to enter the frequency hopping synchronization and hop following state, and when two decision conditions, namely the frequency hopping flag bit and the number of the received frequency hopping synchronization frames, both meet preset conditions, the receiver is switched from the slow scanning state to the synchronization and hop following state;
and under the synchronous following hop state, the receiver enters a state with the same hop rate and synchronous frequency point as the sender, and at the moment, the receiver continuously receives the service frames sent by the sender to realize the corresponding service.
Further, the real-time TOD includes two parts, namely an upper TODH part and a lower TODL part; wherein, the unit of the TODH is minutes, which is used for generating a synchronous frequency point sequence; the TODL unit is hop and is used for generating a frequency hopping pattern in cooperation with a frequency hopping pattern algorithm.
The beneficial effects obtained by the invention are as follows:
1. the invention solves the defect of poor interference capability of PDT/DMR equipment, utilizes the data link frame structure to design the frequency hopping synchronization frame structure suitable for PDT/DMR system on the basis of following PDT/DMR standard empty waveform to the utmost extent, and realizes the rapid synchronization and the synchronization accuracy of frequency hopping.
2. The invention can realize frequency hopping synchronization on the basis of not changing the empty waveform of the PDT/DMR communication system.
Drawings
Fig. 1 is a schematic diagram of a structure of a frequency hopping synchronization frame in an embodiment of the present invention.
Fig. 2 is a flow chart of the process of transmitting side frequency hopping synchronization in the embodiment of the present invention.
Fig. 3 is a flow chart of the process of receiver frequency hopping synchronization in the embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures.
A frequency hopping synchronization method suitable for PDT/DMR comprises the following steps:
the method comprises the following steps: the transmitting party forms a frequency hopping synchronous frame by the frequency hopping synchronous information through the processes of link coding and synchronous word filling, and sends the frequency hopping synchronous frame to the receiving party through synchronous frequency points;
step two: the receiving party is in a slow scanning state before being unsynchronized, and receives a complete frequency hopping synchronization frame when the frequency hopping synchronization frame is consistent with the frequency point of the sending party;
step three: after receiving the frequency hopping synchronization frame, a receiver firstly searches the synchronization word embedded in the synchronization frame, determines the burst initial position, then extracts the effective load according to the burst initial position, and decodes and restores the frequency hopping synchronization information;
step four: and the receiver switches to a synchronous following hop state according to the frequency hopping synchronous information and the judgment threshold to realize synchronous receiving.
Wherein the frequency hopping synchronization information includes:
real-time TOD for generating frequency hopping patterns and synchronous frequency point sequences; the real-time TOD comprises a high-order TODH and a low-order TODL; wherein, the unit of the TODH is minutes, which is used for generating a synchronous frequency point sequence; the TODL unit is hop and is used for generating a frequency hopping pattern by matching with a frequency hopping pattern algorithm;
a frequency hopping flag bit for indicating the receiver to switch the receiving state;
network number for networking.
The frequency hopping synchronization frame structure of the method is shown in fig. 1, the frequency hopping synchronization frame is a frame type used by a frequency hopping system to establish initial frequency hopping synchronization, and the frame structure of the method follows a PDT/DMR data link layer burst format and carries user data and signaling embedded in a protocol data unit (namely PDU). Fig. 1 shows the position of the hopping synchronization information in a time slot. In PDT/DMR standard, the time slot length is 30ms, and the content and occupied duration of the frequency hopping synchronous frame in the method are as follows in sequence: 1.25ms transceiving switching protection time 1, 11.25ms frequency hopping synchronous information load 1, 5ms frame synchronous words, 11.25ms frequency hopping synchronous information load 2 and 1.25ms transceiving switching protection time 2.
Fig. 2 is a processing flow chart of the transmitting side, which specifically includes the following steps:
and step S101, calculating synchronous frequency points according to the TODH to generate a synchronous frequency point set.
In this embodiment, the number of the synchronization frequency points is N, N is greater than or equal to 1 and less than or equal to 3, and a synchronization frequency point set { F is calculated through TODH parameter mapping in the frequency hopping synchronization informationiAnd (i =1 … N), the transmitting party sequentially selects the synchronous frequency points in the synchronous frequency point set to transmit the frequency hopping synchronous frame. The set of synchronized frequency points should be a subset of the set of all frequency points used by frequency hopping.
Step S102, the frequency hopping synchronous information and the time slot type are subjected to link coding and are framed together with the synchronous words.
In this embodiment, the frequency hopping synchronization information includes: real-time TOD for generating frequency hopping patterns and synchronous frequency point sequences; a frequency hopping flag bit for indicating the receiver to switch the receiving state; network number for networking. The time slot type is used for indicating the frame type, and the receiving party judges whether the received data is the frequency hopping synchronous frame or not according to the parameter. The synchronous word is located in the middle of the synchronous frame, and the left side and the right side of the synchronous word are respectively filled with the time slot type and the frequency hopping synchronous information.
And step S103, sending the frequency hopping synchronous frame through the synchronous frequency point.
In this embodiment, in frequency hopping communication, it is necessary to implement frequency hopping synchronization and frame synchronization between the transmitting and receiving sides by transmitting a frequency hopping synchronization frame before starting a service. In order to improve the accuracy of frequency hopping synchronization, a frequency hopping synchronization frame can be repeatedly sent for multiple times, each time the frequency hopping synchronization frame is sent through a synchronization frequency point, the synchronization frequency points can be recycled, a PDT/DMR adopts a time division multiple access frame format, each frame comprises 2 time slots with the duration of 30ms, one time slot is used for transmitting, and the other time slot is used for receiving, so that the frequency hopping synchronization frame is sent in the transmission time slot of the time division multiple access frame.
Fig. 3 is a processing flow chart of the receiving side, which specifically includes the following steps:
step S201, a slow scan is performed on the set of synchronization frequency points.
In this embodiment, the receiver performs cyclic scanning under the set of synchronous frequency points, and in order to make the frequency points of the receiver coincide with the frequency points of the sender at a certain time, the residence time of each synchronous frequency point is longer than that of the sender, that is, the scanning speed of the receiver is slower than that of the sender, for example, the scanning speed of the receiver is 1/(N +1) of that of the sender. Therefore, in the process that the receiving party resides in a certain synchronous frequency point, the sending party can send out N synchronous frames by N synchronous frequency points respectively, and theoretically, the time for the synchronous frequency points of the receiving party to coincide with the synchronous frequency points of the sending party is 60 x (N-1) ms at most. The frequency hopping synchronization time is related to N selection, the larger N is, the stronger the anti-interference performance is, but the longer the synchronization time is, so that the practical use needs to combine the anti-interference performance and the synchronization speed selection.
Step S202, sliding to search the synchronous word, determining the burst initial position and judging whether the frame type is the frequency hopping synchronous frame.
In this embodiment, the receiver receives a burst data, searches for a frame synchronization word through a sliding correlation algorithm, if no synchronization word exists, the frame synchronization word is considered not to be an effective frame, directly discards the data, and continues to receive the data; if the synchronous word is detected, the initial position of the burst data is determined by the position of the synchronous word, and then the time slot type is analyzed.
Step S203, the hopping synchronization information in the hopping synchronization frame is parsed.
In this embodiment, if the analyzed timeslot type indicates a frequency hopping synchronization frame, the frequency hopping synchronization information is further analyzed from the load.
And step S204, entering a synchronous following hop state according to the frequency hopping synchronous information and the judgment threshold.
The judgment threshold is the judgment logic of the receiver entering the frequency hopping synchronization and hop following state, and when the two judgment conditions of the frequency hopping zone bit and the number of the received frequency hopping synchronization frames meet the preset conditions, the receiver is switched into the synchronization and hop following state from the slow scanning state. The synchronous following hop state is a state that the receiver enters the state with the same hop rate and synchronous frequency point as the sender, and the receiver completes frequency hopping synchronization. In practical use, due to differences such as clock drift among different devices, the frequency hopping synchronization state of the receiving party is lost along with time, and then the receiving slow scanning state is returned to for resynchronization.
In a word, the invention designs the frequency hopping synchronization frame structure according to the PDT/DMR data link layer frame structure, so that the frequency hopping synchronization process is simple and quick, and the anti-interference capability of the PDT/DMR equipment is improved.
It should be noted that, as can be understood by those skilled in the art: many changes, modifications, substitutions and alterations can be made to the above-described embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A frequency hopping synchronization method suitable for PDT/DMR is characterized by comprising the following steps:
the method comprises the following steps: the transmitting party forms a frequency hopping synchronous frame by the frequency hopping synchronous information through the processes of link coding and synchronous word filling, and sends the frequency hopping synchronous frame to the receiving party through synchronous frequency points;
step two: the receiving party is in a slow scanning state before being unsynchronized, and receives a complete frequency hopping synchronization frame when the frequency hopping synchronization frame is consistent with the frequency point of the sending party;
step three: after receiving the frequency hopping synchronization frame, a receiver firstly searches the synchronization word embedded in the synchronization frame, determines the burst initial position, then extracts the effective load according to the burst initial position, and decodes and restores the frequency hopping synchronization information;
step four: and the receiver switches to a synchronous following hop state according to the frequency hopping synchronous information and the judgment threshold to realize synchronous receiving.
2. The frequency hopping synchronization method for PDT/DMR as claimed in claim 1, wherein the frequency hopping synchronization information in said first step comprises:
real-time TOD for generating frequency hopping patterns and synchronous frequency point sequences;
a frequency hopping flag bit for indicating the receiver to switch the receiving state;
network number for networking.
3. The frequency hopping synchronization method for PDT/DMR as claimed in claim 2, wherein the frequency hopping synchronization frame in said first step comprises a first transceiving switching guard time, a first frequency hopping synchronization information payload, a frame synchronization word, a second frequency hopping synchronization information payload, and a second transceiving switching guard time.
4. The frequency hopping synchronization method for PDT/DMR as claimed in claim 3, wherein the number of synchronization frequency points in said first step is N, 1 ≦ N ≦ 3, and the synchronization frequency point set { F is calculated by real time TOD mapping in the frequency hopping synchronization informationiAnd i =1 … N, and the transmitting party sequentially selects the synchronous frequency points in the synchronous frequency point set to transmit the frequency hopping synchronous frame.
5. A frequency hopping synchronization method for a PDT/DMR as claimed in claim 4, wherein said slow scanning state in the second step is specifically:
the receiver scans circularly under the synchronous frequency point set, in order to make the frequency point of the receiver coincide with the frequency point of the sender at a certain time, the dwell time of each synchronous frequency point is longer than that of the sender, namely the scanning speed of the receiver is slower than that of the sender, and the scanning speed of the receiver is 1/(N +1) of that of the sender.
6. A frequency hopping synchronization method applied to PDT/DMR as claimed in claim 5, wherein in said third step, the sync word is located at the middle position of the time slot burst, the sync word and the position are detected by using a sliding correlation algorithm, and the start position of the burst is determined according to the position of the sync word, thereby realizing frame synchronization; then, frequency hopping synchronous information in the effective load is extracted step by step, and the frequency hopping synchronous information is restored through link decoding.
7. The frequency hopping synchronization method for PDT/DMR as claimed in claim 6, wherein in said step four, the decision threshold is the decision logic for the receiver to enter the frequency hopping synchronization and hopping state, and when the two decision conditions of the frequency hopping flag bit and the number of the received frequency hopping synchronization frames both meet the preset condition, the receiver is switched from the slow scanning state to the synchronization and hopping state;
and under the synchronous following hop state, the receiver enters a state with the same hop rate and synchronous frequency point as the sender, and at the moment, the receiver continuously receives the service frames sent by the sender to realize the corresponding service.
8. A frequency hopping synchronization method as claimed in claim 2, wherein said real time TOD comprises two parts of high TODH and low TODL; wherein, the unit of the TODH is minutes, which is used for generating a synchronous frequency point sequence; the TODL unit is hop and is used for generating a frequency hopping pattern in cooperation with a frequency hopping pattern algorithm.
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| CN115333571A (en) * | 2022-06-22 | 2022-11-11 | 飞芯智控(西安)科技有限公司 | Synchronous processing method and device of frequency hopping communication system |
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