CN108183742B

CN108183742B - Satellite communication method and device

Info

Publication number: CN108183742B
Application number: CN201711393928.0A
Authority: CN
Inventors: 徐佳康; 刘丽坤; 李源
Original assignee: Beijing Commsat Technology Development Co Ltd
Current assignee: Beijing Commsat Technology Development Co Ltd
Priority date: 2017-12-21
Filing date: 2017-12-21
Publication date: 2021-04-20
Anticipated expiration: 2037-12-21
Also published as: CN108183742A

Abstract

The disclosure relates to a satellite communication method and device, which includes setting a receiving signal range corresponding to each beam in a satellite, wherein the receiving signal ranges corresponding to different beams are different. And setting the receiving mode of the uplink signal of each beam according to the receiving signal range corresponding to each beam. And each beam processes the received uplink signal of each user terminal according to the corresponding receiving mode. The method and the device assist in implementing isolation among beams through global satellite positioning data of a user side, effectively reduce communication performance loss of a beam overlapping area by utilizing beam coordination on the satellite, and further improve system capacity. Meanwhile, the method has the advantages of small system overhead and wide application range, and can greatly improve the system capacity under the condition of not occupying additional time and spectrum resources.

Description

Satellite communication method and device

Technical Field

The present disclosure relates to the field of satellite communications, and in particular, to a satellite communication method and apparatus.

Background

With the development of information technology and space technology, the field of satellite communication has also been rapidly developed. The existing cellular mobile communication network only covers 5% of the land area on the earth, and a large number of areas such as oceans, deserts and suburbs are not covered, and although the areas are rare, the areas are still required to be networked. Related art uses multi-beam satellite communications to solve the networking problem. However, there is an overlap between the satellite beams, so that the signals of the same user are received by different beams, and the signals of users in different partitioned spaces interfere with each other. Since the propagation distances from different users to the satellite in the satellite communication system are basically consistent and the receiving powers are also basically consistent, the transmission of the interference condition between the users is further deteriorated, and in an extreme case, all the users in the beam overlapping area cannot perform effective communication, thereby bringing great loss to the capacity of the whole system. In addition, the space on the satellite is limited, and the use of the ground beamforming technology on the satellite is limited to a certain extent due to insufficient processing capacity.

Disclosure of Invention

In view of the above, the present disclosure provides a satellite communication method and apparatus.

According to an aspect of the present disclosure, there is provided a satellite communication method, including:

setting a receiving signal range corresponding to each wave beam in the satellite, wherein the receiving signal ranges corresponding to different wave beams are different;

setting a receiving mode of an uplink signal of each wave beam according to a receiving signal range corresponding to each wave beam;

and each beam processes the received uplink signal of each user terminal according to the corresponding receiving mode.

For the above method, in one possible implementation manner, setting a reception manner of an uplink signal of each beam according to a reception signal range corresponding to each beam includes:

the reception method of the uplink signal of each beam is set to receive only the uplink signal within its own reception signal range.

and setting the receiving mode of the uplink signal of each beam as receiving the uplink signal of the own receiving signal range, and receiving the uplink signal of the receiving signal range of the adjacent beam.

For the above method, in a possible implementation manner, each beam processes the received uplink signal of each ue according to the corresponding receiving manner, including:

if the first beam receives a superposed signal of a first uplink signal from a first user terminal and a second uplink signal from a second user terminal, performing packet loss processing on the superposed signal;

the first uplink signal and the second uplink signal are both in a first receiving signal range corresponding to the first beam, the second beam is a beam adjacent to the first beam, and the uplink signal of the first beam is received in a manner of receiving the uplink signals in the first receiving signal range and the second receiving signal range.

For the above method, in a possible implementation manner, each beam processes the received uplink signal of each ue according to the corresponding receiving manner, further including:

if the first beam receives a superposed signal of a first uplink signal from a first user terminal and a second uplink signal from a second user terminal, and the second beam receives a second uplink signal from the second user terminal, the second beam receives the second uplink signal, and the second uplink signal is subtracted from the superposed signal received by the first beam to obtain a first uplink signal;

the first uplink signal and the second uplink signal are both in a first receiving signal range corresponding to the first beam, the second beam is a beam adjacent to the first beam, and the uplink signal of the second beam is received in a manner of receiving the uplink signals in the first receiving signal range and the second receiving signal range.

confirming successful reception if the first beam receives a first uplink signal from the first user terminal and a third uplink signal from the third user terminal;

the first uplink signal is in a first receiving signal range corresponding to the first beam, the third uplink signal is in a third receiving signal range corresponding to the third beam, the third beam is an adjacent beam of the first beam, and the uplink signal of the first beam is received in a manner of receiving the uplink signals of the first receiving signal range and the third receiving signal range.

According to another aspect of the present disclosure, there is provided a satellite communication method including:

the user terminal acquires the position of the user terminal;

determining the orbital position of the satellite according to the ephemeris of the satellite;

determining a receiving signal range corresponding to a satellite beam accessed by the user terminal according to the position of the user terminal, the orbit position of the satellite and the beam layout;

the transmitting signal range of the uplink signal of the user terminal is set to be the same as the receiving signal range of the satellite beam accessed by the user terminal.

For the above method, in a possible implementation manner, determining the orbital position of the satellite according to the ephemeris of the satellite includes:

receiving a broadcast pilot frequency from a satellite, and updating ephemeris in the user terminal according to the broadcast pilot frequency;

and calculating the orbit position of the satellite at the current moment according to the ephemeris.

For the above method, in a possible implementation manner, determining, according to the position of the user terminal, the orbital position of the satellite, and the beam layout, a received signal range corresponding to a satellite beam accessed by the user terminal includes:

calculating the azimuth angle and the elevation angle of the user terminal relative to the satellite according to the position of the user terminal and the orbit position of the satellite;

and searching and obtaining a receiving signal range corresponding to the satellite beam accessed by the user terminal in the beam layout according to the azimuth angle and the elevation angle.

For the above method, in a possible implementation manner, setting a transmission signal range of an uplink signal of the user terminal to be the same as a reception signal range of a satellite beam accessed by the user terminal, includes:

if the number of satellite beams accessed by the user terminal is more than two;

the transmission signal range of the uplink signal of the user terminal is set to be the same as the reception signal range of any satellite beam accessed by the user terminal.

According to another aspect of the present disclosure, there is provided a satellite communication device including:

the satellite comprises a first setting module, a second setting module and a third setting module, wherein the first setting module is used for setting a receiving signal range corresponding to each wave beam in a satellite, and the receiving signal ranges corresponding to different wave beams are different;

the second setting module is used for setting the receiving mode of the uplink signal of each wave beam according to the receiving signal range corresponding to each wave beam;

and the processing module is used for processing the received uplink signals of the user terminals by the beams according to the corresponding receiving modes.

For the apparatus, in one possible implementation manner, the second setting module includes:

and the first setting submodule is used for setting the receiving mode of the uplink signal of each beam to be the uplink signal only receiving the self receiving signal range.

and the second setting submodule is used for setting the receiving mode of the uplink signal of each beam to receive the uplink signal of the receiving signal range of the receiving submodule and receiving the uplink signal of the receiving signal range of the adjacent beam.

For the apparatus, in one possible implementation, the processing module includes:

the first processing submodule is used for performing packet loss processing on a superposed signal if a first beam receives the superposed signal of a first uplink signal from a first user terminal and a second uplink signal from a second user terminal;

For the apparatus, in a possible implementation manner, the processing module further includes:

a second processing sub-module, configured to receive a second uplink signal using a second beam if the first beam receives a superimposed signal of a first uplink signal from the first user terminal and a second uplink signal from the second user terminal, and the second beam receives a second uplink signal from the second user terminal, and subtract the second uplink signal from the superimposed signal received by the first beam to obtain a first uplink signal;

a third processing sub-module, configured to confirm successful reception if the first beam receives the first uplink signal from the first user terminal and the third uplink signal from the third user terminal;

the acquisition module is used for acquiring the position of the user terminal;

the first determination module is used for determining the orbit position of the satellite according to the ephemeris of the satellite;

a second determining module, configured to determine, according to a position of the second determining module, an orbit position of the satellite, and a beam layout, a received signal range corresponding to a satellite beam to which the user terminal is accessed;

and the third setting module is used for setting the transmitting signal range of the uplink signal of the user terminal to be the same as the receiving signal range of the satellite beam accessed by the user terminal.

For the apparatus, in one possible implementation manner, the first determining module includes:

the first determining submodule is used for receiving a broadcast pilot frequency from a satellite and updating an ephemeris in the user terminal according to the broadcast pilot frequency;

and the second determining submodule is used for calculating the orbit position of the satellite at the current moment according to the ephemeris.

For the apparatus, in one possible implementation manner, the second determining module includes:

the third determining submodule is used for calculating the azimuth angle and the elevation angle of the user terminal relative to the satellite according to the position of the third determining submodule and the orbit position of the satellite;

and the fourth determining submodule is used for searching and obtaining a receiving signal range corresponding to the satellite beam accessed by the user terminal in the beam layout according to the azimuth angle and the elevation angle.

For the apparatus, in one possible implementation manner, the third setting module includes:

and the third setting submodule is used for setting the transmitting signal range of the uplink signal of the user terminal to be the same as the receiving signal range of any satellite beam accessed by the user terminal if the number of the satellite beams accessed by the user terminal is more than two.

The method and the device assist in implementing isolation among beams through global satellite positioning data of a user side, effectively reduce communication performance loss of a beam overlapping area by utilizing beam coordination on the satellite, and further improve system capacity. Meanwhile, the method has the advantages of small system overhead and wide application range, and can greatly improve the system capacity under the condition of not occupying additional time and spectrum resources.

Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a flow chart illustrating a method of satellite communication according to an example embodiment.

Fig. 2 is a flow chart illustrating a method of satellite communication according to an example embodiment.

Fig. 3 is a schematic structural diagram of a satellite communication system in a first application scenario, a second application scenario, and a third application scenario of the present disclosure.

FIG. 4 is a logic diagram of a system that does not use the disclosed method in a first application scenario.

Fig. 5 is a logic diagram of a system using mode one in a first application scenario.

Fig. 6 is a system logic diagram for use of mode two in a first application scenario.

Fig. 7 is a logic diagram of a system using mode three in a first application scenario.

FIG. 8 is a logic diagram of a system that does not use the disclosed method in a second application scenario.

Fig. 9 is a logic diagram of a system using mode one in a second application scenario.

FIG. 10 is a system logic diagram for use of mode two in a second application scenario.

Fig. 11 is a logic diagram of a system using mode three in a second application scenario.

FIG. 12 is a system logic diagram without the disclosed method in a third application scenario.

Fig. 13 is a logic diagram of a system using mode one in a third application scenario.

Fig. 14 is a logic diagram of a system using mode two in a third application scenario.

Fig. 15 is a logic diagram of a system using mode three in a third application scenario.

Fig. 16 is a block diagram of a satellite communication device according to an example embodiment.

Fig. 17 is a block diagram of a satellite communication device according to an example of an example embodiment.

Fig. 18 is a block diagram of a satellite communication device according to another exemplary embodiment.

Fig. 19 is a block diagram of a satellite communication device according to an example of an example embodiment.

Fig. 20 is a block diagram of a satellite communication device according to an example embodiment.

Fig. 21 is a block diagram of a satellite communication device according to another exemplary embodiment.

Detailed Description

Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.

Fig. 1 is a flow chart illustrating a method of satellite communication according to an example embodiment. The method is applied to satellites. As shown in fig. 1, the method includes:

step 100, setting a receiving signal range corresponding to each beam in the satellite, wherein the receiving signal ranges corresponding to different beams are different.

Step 101, setting the receiving mode of the uplink signal of each beam according to the receiving signal range corresponding to each beam.

And 102, processing the received uplink signals of the user terminals by the beams according to the corresponding receiving modes.

As an example of this embodiment, the received signal range corresponding to the satellite beam may include symbols and/or frequency points corresponding to the satellite beam. For example, if a first beam and a second beam are included in the satellite, the reception range of the first beam may be set to a first symbol and the reception range of the second beam may be set to a second symbol, where the first symbol is different from the second symbol. For another example, if the satellite includes a first beam and a second beam, the receiving range of the first beam may be set as a first frequency point, and the receiving range of the second beam may be set as a second frequency point, where the first frequency point is different from the second frequency point.

In this embodiment, the receiving manner set in step 101 may include multiple manners.

Example one: the reception method of the uplink signal of each beam is set to receive only the uplink signal within its own reception signal range.

For example, if the received signal range of the first beam of the satellite is the first symbol and the received signal range of the second beam is the second symbol, the uplink signal receiving mode of the first beam may be set to receive only the uplink signal of the first symbol and the uplink signal receiving mode of the second beam may be set to receive only the uplink signal of the second symbol.

Example two: and setting the receiving mode of the uplink signal of each beam as receiving the uplink signal of the own receiving signal range, and receiving the uplink signal of the receiving signal range of the adjacent beam.

For example, if the received signal range of the first beam in the satellite is the first frequency point and the received signal range of the second beam is the second frequency point, the uplink signal receiving manners of the first beam and the second beam may be set to receive the uplink signal of the first frequency point and the uplink signal of the second frequency point.

For example one and example two, step 102 may comprise: and if the first beam receives a superposed signal of a first uplink signal from the first user terminal and a second uplink signal from the second user terminal, performing packet loss processing on the superposed signal. The first uplink signal and the second uplink signal are both in a first receiving signal range corresponding to the first beam, the second beam is a beam adjacent to the first beam, and the uplink signal of the first beam is received in a manner of receiving the uplink signals in the first receiving signal range and the second receiving signal range.

Since the transmission signal range of the first uplink signal is the same as the transmission signal range of the second uplink signal, when the first beam receives the first uplink signal and the second uplink signal at the same time, the first beam receives a superimposed signal of the first uplink signal and the second uplink signal. If the satellite cannot distinguish the superposed signal, the satellite can directly lose the superposed signal due to time-efficiency.

For example two, step 102 may further comprise: if the first beam receives a superposed signal of a first uplink signal from the first user terminal and a second uplink signal from the second user terminal, and the second beam receives a second uplink signal from the second user terminal, the second beam receives the second uplink signal, and the second uplink signal is subtracted from the superposed signal received by the first beam to obtain the first uplink signal. The first uplink signal and the second uplink signal are both in a first receiving signal range corresponding to the first beam, the second beam is a beam adjacent to the first beam, and the uplink signal of the second beam is received in a manner of receiving the uplink signals in the first receiving signal range and the second receiving signal range.

In example two, the first beam and the second beam may receive uplink signals in their own reception signal range, or may receive uplink signals in a reception signal range of an adjacent beam. In this way, in the case where the first beam receives the superimposed signal of the first uplink signal and the second uplink signal, if the second beam can successfully receive the second uplink signal, the satellite may process the superimposed signal received by the first beam according to the second uplink signal successfully received by the second beam. Specifically, the second uplink signal may be subtracted from the superimposed signal to reconstruct the first uplink signal, so as to reduce system packet loss.

According to the method and the device, the uplink signals of the adjacent beams are received by utilizing the on-satellite beam coordination, the received superposed signals can be reconstructed according to the received effective signals of the adjacent beams, the communication performance loss of the beam overlapping area is effectively reduced, and the system capacity is further improved. Meanwhile, the method has the advantages of small system overhead and wide application range, and can greatly improve the system capacity under the condition of not occupying additional time and spectrum resources.

For example two, step 102 further comprises: and if the first beam receives the first uplink signal from the first user terminal and the third uplink signal from the third user terminal, confirming successful reception. The first uplink signal is in a first receiving signal range corresponding to the first beam, the third uplink signal is in a third receiving signal range corresponding to the third beam, the third beam is an adjacent beam of the first beam, and the uplink signal of the first beam is received in a manner of receiving the uplink signals of the first receiving signal range and the third receiving signal range.

In example two, the first beam and the second beam may receive uplink signals in their own reception signal range, or may receive uplink signals in a reception signal range of an adjacent beam. When the same wave beam receives two uplink signals in different receiving signal ranges, the two uplink signals can be accurately identified, successful receiving is confirmed, and the packet loss rate is reduced.

Fig. 2 is a flow chart illustrating a method of satellite communication according to an example embodiment. The method is applied to a user terminal, such as a mobile communication terminal, a computer device, a radio navigation device, and the like, which can communicate with a satellite, and is not limited herein. As shown in fig. 2, the method includes:

step 200, the user terminal obtains its own position.

Step 201, determining the orbital position of the satellite according to the ephemeris of the satellite.

Step 202, determining a receiving signal range corresponding to a satellite beam accessed by the user terminal according to the position of the user terminal, the orbit position of the satellite and the beam layout.

Step 203, setting the transmission signal range of the uplink signal of the user terminal to be the same as the reception signal range of the satellite beam accessed by the user terminal.

In a possible implementation manner, the received signal range corresponding to the satellite beam is a symbol and/or a frequency point corresponding to the satellite beam.

As an example of the present embodiment:

step 200 may include: the user obtains its own position (e.g., longitude and latitude) through the Global Navigation Satellite System (Global Navigation Satellite System), which includes but is not limited to the following categories: GPS (Global Positioning System), BDS (BeiDou Navigation Satellite System, china BeiDou Satellite Navigation System), GLONASS (Global Navigation Satellite SATELLITE SYSTEM, GLONASS Satellite Navigation System), and Galileo Satellite Navigation System (Galileo Satellite Navigation System).

Step 201 may include: and receiving a broadcast pilot frequency from a satellite, and updating the ephemeris in the user terminal according to the broadcast pilot frequency. And calculating the orbit position of the satellite at the current moment according to the ephemeris.

The satellite ephemeris is also called Two-Line Orbital Element (TLE), which is an expression used to describe the position and velocity of the space vehicle. The mathematical relation among the 6 orbit parameters of the Kepler law is used for determining various parameters of the flying body such as time, coordinates, direction, speed and the like, and the accuracy is extremely high. The user terminal on the ground can calculate the orbit position of the satellite at the current moment according to the satellite ephemeris.

Step 202 may include: and calculating the azimuth angle and the elevation angle of the user terminal relative to the satellite according to the position of the user terminal and the orbital position of the satellite. And searching and obtaining a receiving signal range corresponding to the satellite beam accessed by the user terminal in the beam layout according to the azimuth angle and the elevation angle.

The on-satellite antenna beam layout stored by the terminal may include the angular range of azimuth and elevation angles covered by each beam in the satellite. When the azimuth angle and the elevation angle of the user terminal and the coverage area of the satellite in a certain beam are determined, the beam number where the user terminal is located can be determined, and the received signal range corresponding to the satellite beam accessed by the user terminal can be determined.

Step 203 comprises: the transmitting signal range of the uplink signal of the user terminal is set to be the same as the receiving signal range of the satellite beam accessed by the user terminal. For example, if the user terminal is in the coverage of the first beam and the received signal range of the first beam is the first symbol, the transmitted signal range of the uplink signal of the user terminal is set as the first symbol.

As an example of this embodiment, step 203 further includes: if the number of satellite beams accessed by the user terminal is more than two, the transmission signal range of the uplink signal of the user terminal can be set to be the same as the receiving signal range of any satellite beam accessed by the user terminal.

For example, if the ue is simultaneously in the coverage of the first beam and the second beam, the received signal range of the first beam is the first symbol, and the received signal range of the second beam is the second symbol, the ue may transmit the uplink signal by using the first symbol or the second symbol.

The following is an application example of a satellite communication method, which may include:

the method comprises the following steps: the satellite transmits a broadcast pilot to the user, which is used to synchronize the user and update the ephemeris at the user side.

Step two: the user side determines the current terminal position according to the GPS signal of the user side, and calculates the satellite orbit position at the current moment according to the ephemeris transmitted by the satellite, thereby calculating and obtaining the azimuth angle and the elevation angle of the terminal relative to the satellite. And then, according to the on-satellite antenna beam layout stored by the terminal, looking up a table to finally obtain the beam number accessed by the terminal.

Step three: and the users in different access beams use different code elements or frequency points to transmit uplink signals.

Step four: each beam on the satellite receives an uplink signal of a user by using a set symbol or frequency point, which may specifically include the following modes:

the first method is as follows: different beams on the satellite receive uplink signals by using the corresponding code elements or frequency points. Since different beams use different symbols or frequency bins, the interference between different beams disappears.

The second method comprises the following steps: different beams on the satellite not only use the corresponding code elements and frequency points to receive uplink signals, but also use the code elements or frequency points of adjacent beams to receive signals. And then separately decides. In which case the inter-beam interference disappears and the user with the wrong beam selection can be decoded. In addition, since the users in the beam overlapping area can be received by a plurality of beams respectively, a plurality of judgments can be obtained through respective decoding, and the packet loss rate of the users in the beam overlapping area can be reduced through judgment and combination.

The third method comprises the following steps: different beams on the satellite not only use the corresponding code elements and frequency points to receive uplink signals, but also use the code elements or frequency points of adjacent beams to receive signals. Then, the received signals are processed and then determined. In which case the inter-beam interference disappears and the user with the wrong beam selection can be decoded. In addition, since the users in the beam overlapping area are respectively received by the multiple beams and the received signals are combined in a correlation manner, the receiving signal-to-noise ratio can be effectively improved, and thus the packet receiving rate can be improved.

The working flow and the specific effects of the satellite communication method of the present disclosure are described below in conjunction with a specific network structure. As shown in fig. 3, in this network architecture, the coverage area of the entire satellite traffic load is covered by two beams. The beams overlap each other by 50% of the area between the beams. The entire coverage area has three users. Where user U1 is in the coverage area of beam 1, user U2 is in the coverage area of beam overlap region covered by beam 1 and beam 2, and user U3 is in the coverage area of beam 2. It is assumed that a user's signal can be accurately received by a satellite without interference from other users ' signals, and a user's signal is wrapped by a satellite in the case that the user is interfered by another user.

The application scene one: multiple users transmit uplink signals simultaneously.

And a plurality of users use the same code word or frequency point to simultaneously send uplink signals. If the same beam of the satellite receives signals of a plurality of users, the users will interfere with each other to cause packet loss.

As shown in fig. 4: signals received on beam 1 between user U1 and user U2 interfere with each other, resulting in packet loss. The signals of user U2 and user U3 received on beam 2 interfere with each other, resulting in packet loss. Therefore, when the satellite communication method disclosed by the disclosure is not used, all the packets of all the users are lost, and the packet loss rate is 100%.

If the method disclosed by the invention is used, the user can calculate the beam to be accessed by combining the satellite ephemeris map with the GPS signal of the user terminal, so that different code elements or frequency points can be used for communication. Suppose user U1 and user U3 would use symbol c1 and symbol c2 or bin f1 and bin f2, respectively, while user U2 might randomly select a symbol or bin. Further assume that the symbol or bin of the selected communication of user U2 is the same as user U1.

The reception method of the uplink signal of the satellite beam is the first method described above. As shown in fig. 5: when the satellite receives a signal, beam 1 receives the signal using symbol c1 or frequency point f1, and beam 2 receives the signal using symbol c2 or frequency point f 2. Due to symbol orthogonality or frequency orthogonality, beam 1 will receive the signals of user U1 and user U2, while beam 2 will receive only the signal of user U3. Therefore, when the method is used in one, the data of the user U3 can be accurately received, and the system packet loss rate is 66.6%.

The reception method of the uplink signal of the satellite beam is the second method described above. As shown in fig. 6: beam 1 receives signals using bins f1 and f2 or symbols c1 and c2, respectively, and beam 2 also receives signals using bins f1 and f2 or symbols c1 and c2, respectively, beam 1 receives signals for user U1 and user U2. Since the two interfere with each other, beam 1 is totally lost. Beam 2 receives signals from users U2 and U3, respectively, and since the symbols or frequency points of the two signals are orthogonal, the two signals do not interfere with each other and can be received. Therefore, when the second mode is used, the system packet loss rate is 33.3%.

The reception method of the uplink signal of the satellite beam is the third method described above. As shown in fig. 7: similar to option 2, beam 2 can accurately receive packets of users U2 and U3, while beam 1 receives signals using frequency points f1 and f2 or symbols c1 and c2, respectively, and beam 2 also receives signals using frequency points f1 and f2 or symbols c1 and c2, respectively. With the data packet from U2 received by beam 2, we can reconstruct the signal of U2 user, and then subtract the signal of U2 from the signal received by beam 1, we can extract the signal of U1 user, and then the data packet of U1 can be accurately received, so when using mode three, the system packet loss rate is 0.

Application scenario two: the plurality of users do not transmit uplink signals simultaneously.

For example, the user U1 and the user U2 transmit simultaneously, the user U3 transmits at different times, and when signals of multiple users are received by the same beam, the users will interfere with each other, resulting in packet loss.

As shown in fig. 8, if all users use the same code word or frequency bin, signals received by beam 1 between user U1 and user U2 interfere with each other, resulting in packet loss. And the signals of the user U2 and the user U3 received by the beam 2 are orthogonal to each other in the time domain, so that the data packets of the user U2 and the user U3 can be received. Therefore, when the invention is not used, the packet loss rate is 33.3%.

The reception method of the uplink signal of the satellite beam is the first method described above. As shown in fig. 9: in receiving a signal, beam 1 receives a signal using symbol c1 or frequency bin f1, and beam 2 receives a signal using symbol c2 or frequency bin f 2. The beam 1 receives signals of the same symbol or frequency point of the user U1 and the user U2 at the same time, and the signals interfere with each other, resulting in packet loss. While beam 2 will only receive the signal of user U3. Therefore, when the method is used in one, the data of the user U3 can be accurately received, and the packet loss rate is 66.6%.

The reception method of the uplink signal of the satellite beam is the second method described above. As shown in fig. 10: beam 1 receives signals using bins f1 and f2 or symbols c1 and c2, respectively, and beam 2 also receives signals using bins f1 and f2 or symbols c1 and c2, respectively. Beam 1 will receive the signals of user U1 and user U2. Since the signals of user U1 and user U2 interfere with each other, beam 1 is totally lost. While beam 2 receives signals from users U2 and U3, respectively, since they are orthogonal in time domain, they do not interfere with each other and can be received. The packet loss rate is therefore 33.3% using option 2 of the present invention.

The reception method of the uplink signal of the satellite beam is the third method described above. As shown in fig. 11: beam 1 receives signals using bins f1 and f2 or symbols c1 and c2, respectively, and beam 2 also receives signals using bins f1 and f2 or symbols c1 and c2, respectively. Similar to the second mode of the present application scenario, the beam 2 can accurately receive the data packets of the users U2 and U3. With the data packets from U2 received on beam 2, the signals of U2 users can be reconstructed. The signal from U2 is subtracted from the signal received on beam 1 to extract the signal from user U1. Then, the data packet of U1 can also be received accurately, so the system packet loss rate is 0.

Application scenario three: the plurality of users do not transmit uplink signals simultaneously.

For example, the user U2 and the user U3 transmit simultaneously, the user U1 transmits at different times, and when signals of multiple users are received by the same beam, the users will interfere with each other, resulting in packet loss.

As shown in fig. 12, if all users use the same code word or frequency point, the signals between user U1 and user U2 received by beam 1 are orthogonal to each other in the time domain, and can be accurately received. The signals of the user U2 and the user U3 received by the beam 2 interfere with each other, so the packets of the user U2 and the user U3 are lost. Thus, without the use of the present disclosure, the packet loss rate is 33.3%.

The reception method of the uplink signal of the satellite beam is the first method described above. As shown in fig. 13: in receiving a signal, beam 1 receives a signal using symbol c1 or frequency bin f1, and beam 2 receives a signal using symbol c2 or frequency bin f 2. Beam 1 will receive the signals of user U1 and user U2 due to symbol orthogonality or frequency orthogonality, and can be accurately received due to the time orthogonality of the users of U1 and U2. And beam 2 will only receive the signal from user U3 and can therefore be received accurately. The packet loss rate is 0.

The reception method of the uplink signal of the satellite beam is the second method described above. As shown in fig. 14: when the beam 1 receives signals using the frequency points f1 and f2 or the symbols c1 and c2, respectively, and the beam 2 also receives signals using the frequency points f1 and f2 or the symbols c1 and c2, respectively, the beam 1 receives the signals of the user U1 and the user U2, and the two signals are orthogonal to each other in time domain, so that all the data received by the beam 1 can be accurately received. Beam 2 receives signals from users U2 and U3, respectively, and since the two are orthogonal in symbol or frequency, they do not interfere with each other and can be received. Therefore, the packet loss rate 0 in case of using option 2 of the present invention, and since the signal of user U2 can be determined in beam 1 and beam 2, respectively, the packet loss rate of the data packet of user U2 can be further decreased.

The reception method of the uplink signal of the satellite beam is the third method described above. As shown in fig. 15: beam 1 receives signals using bins f1 and f2 or symbols c1 and c2, respectively, and beam 2 also receives signals using bins f1 and f2 or symbols c1 and c2, respectively. Similar to the second application scenario, the system packet loss rate is 0. Moreover, the signals of the user U2 received by the beam 1 and the signals of the user U2 obtained by the beam 2 are correlated and combined, so that the signal-to-noise ratio of the user U2 can be effectively improved, and the packet loss rate of the user U2 can be further improved.

In summary, without the present disclosure, if the system on the user side sends out 9 data packets in total, the data packets are accurately received by 4 data packets on the satellite side, and the average packet loss rate is 55.5%. After the first usage mode is used, the system can accurately receive 5 packets, and the average packet loss rate is 44.4%. After the second usage mode, the system can accurately receive 7 packets, and the average packet loss rate is 22.2%. After the third usage mode, the system can accurately receive 9 packets, and the average packet loss rate is 0. From a system capacity perspective, the system capacity is improved by 25% after the first usage mode relative to the case without the present disclosure; after the second use mode, the system capacity is improved by more than 75 percent; after the third mode of use, the system capacity is improved by more than 125%. The satellite communication method can effectively improve the system capacity and provide the system reliability.

Fig. 16 is a block diagram of a satellite communication device according to an example embodiment. Referring to fig. 16, the apparatus may be applied to a satellite, and the apparatus may include:

a first setting module 41, configured to set a received signal range corresponding to each beam in the satellite, where the received signal ranges corresponding to different beams are different;

a second setting module 42, configured to set a receiving manner of the uplink signal of each beam according to a receiving signal range corresponding to each beam;

and a processing module 43, configured to process, by each beam, the received uplink signal of each ue according to the corresponding receiving method.

Fig. 17 is a block diagram of a satellite communication device according to an example of an example embodiment. For convenience of explanation, only the portions related to the present embodiment are shown in fig. 17. Components in fig. 17 having the same reference numerals as those in fig. 16 have the same functions, and detailed descriptions thereof are omitted for the sake of brevity. As shown in fig. 17:

the second setup module 42 may include:

the first setting submodule 421 is configured to set the reception mode of the uplink signal of each beam to receive only the uplink signal in its own reception signal range.

In one possible implementation, the second setting module 42 includes:

the second setting sub-module 422 is configured to set the receiving manner of the uplink signal of each beam to receive the uplink signal in its own receiving signal range, and receive the uplink signal in the receiving signal range of the adjacent beam.

In one possible implementation, the processing module 43 includes:

the first processing submodule 431 is configured to, if the first beam receives a superimposed signal of a first uplink signal from the first user terminal and a second uplink signal from the second user terminal, perform packet loss processing on the superimposed signal;

In a possible implementation, the processing module 43 further includes:

a second processing submodule 432, configured to receive the second uplink signal using the second beam if the first beam receives a superimposed signal of the first uplink signal from the first user terminal and the second uplink signal from the second user terminal, and the second beam receives the second uplink signal from the second user terminal, and subtract the second uplink signal from the superimposed signal received by the first beam to obtain the first uplink signal;

In a possible implementation, the processing module 43 further includes:

a third processing submodule 433, configured to confirm successful reception if the first beam receives the first uplink signal from the first user equipment and the third uplink signal from the third user equipment;

Fig. 18 is a block diagram of a satellite communication device according to another exemplary embodiment. Referring to fig. 18, the apparatus may be applied in a user terminal, and may include:

an obtaining module 51, configured to obtain a location of a user terminal;

a first determining module 52, configured to determine an orbital position of a satellite according to ephemeris of the satellite;

a second determining module 53, configured to determine, according to a position of the second determining module, an orbit position of the satellite, and a beam layout, a received signal range corresponding to a satellite beam accessed by the user terminal;

and a third setting module 54, configured to set a transmission signal range of the uplink signal of the user terminal to be the same as a reception signal range of a satellite beam accessed by the user terminal.

Fig. 19 is a block diagram of a satellite communication device according to an example of an example embodiment. For convenience of explanation, only the portions related to the present embodiment are shown in fig. 19. Components in fig. 19 having the same reference numerals as those in fig. 18 have the same functions, and detailed descriptions thereof are omitted for the sake of brevity. As shown in fig. 19:

in one possible implementation, the first determining module 52 includes:

a first determining submodule 521, configured to receive a broadcast pilot from a satellite, and update an ephemeris in the user terminal according to the broadcast pilot;

and a second determining submodule 522, configured to calculate the orbital position of the satellite at the current time according to the ephemeris.

In one possible implementation, the second determining module 53 includes:

the third determining submodule 531 is configured to calculate an azimuth angle and an elevation angle of the user terminal with respect to the satellite according to the position of the third determining submodule and the orbital position of the satellite;

and the fourth determining submodule 532 is configured to search and obtain a received signal range corresponding to a satellite beam accessed by the user terminal in the beam layout according to the azimuth angle and the elevation angle.

In one possible implementation, the third setting module 54 includes:

a third setting submodule 541, configured to set, if the number of satellite beams accessed by the user terminal is more than two, a transmission signal range of an uplink signal of the user terminal to be the same as a reception signal range of any satellite beam accessed by the user terminal.

Fig. 20 is a block diagram illustrating a satellite communication device according to an example embodiment. For example, the apparatus 800 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, an exercise device, a personal digital assistant, and the like.

Referring to fig. 20, the apparatus 800 may include one or more of the following components: processing component 802, memory 804, power component 806, multimedia component 808, audio component 810, input/output (I/O) interface 812, sensor component 814, and communication component 816.

The processing component 802 generally controls overall operation of the device 800, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 802 may include one or more processors 820 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 802 can include one or more modules that facilitate interaction between the processing component 802 and other components. For example, the processing component 802 can include a multimedia module to facilitate interaction between the multimedia component 808 and the processing component 802.

The memory 804 is configured to store various types of data to support operations at the apparatus 800. Examples of such data include instructions for any application or method operating on device 800, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 804 may be implemented by any type or combination of volatile or non-volatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.

Power components 806 provide power to the various components of device 800. The power components 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the apparatus 800.

The multimedia component 808 includes a screen that provides an output interface between the device 800 and a user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 808 includes a front facing camera and/or a rear facing camera. The front camera and/or the rear camera may receive external multimedia data when the device 800 is in an operating mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

The audio component 810 is configured to output and/or input audio signals. For example, the audio component 810 includes a Microphone (MIC) configured to receive external audio signals when the apparatus 800 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 804 or transmitted via the communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.

The I/O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.

The sensor assembly 814 includes one or more sensors for providing various aspects of state assessment for the device 800. For example, the sensor assembly 814 may detect the open/closed status of the device 800, the relative positioning of components, such as a display and keypad of the device 800, the sensor assembly 814 may also detect a change in the position of the device 800 or a component of the device 800, the presence or absence of user contact with the device 800, the orientation or acceleration/deceleration of the device 800, and a change in the temperature of the device 800. Sensor assembly 814 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 814 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

The communication component 816 is configured to facilitate communications between the apparatus 800 and other devices in a wired or wireless manner. The device 800 may access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 816 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 816 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

In an exemplary embodiment, the apparatus 800 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the above-described methods.

In an exemplary embodiment, a non-transitory computer-readable storage medium, such as the memory 804, is also provided that includes computer program instructions executable by the processor 820 of the device 800 to perform the above-described methods.

Fig. 21 is a block diagram illustrating a satellite communication device according to another exemplary embodiment. For example, the apparatus 1900 may be provided as a server. Referring to FIG. 21, the device 1900 includes a processing component 1922 further including one or more processors and memory resources, represented by memory 1932, for storing instructions, e.g., applications, executable by the processing component 1922. The application programs stored in memory 1932 may include one or more modules that each correspond to a set of instructions. Further, the processing component 1922 is configured to execute instructions to perform the above-described method.

The device 1900 may also include a power component 1926 configured to perform power management of the device 1900, a wired or wireless network interface 1950 configured to connect the device 1900 to a network, and an input/output (I/O) interface 1958. The device 1900 may operate based on an operating system stored in memory 1932, such as Windows Server, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, or the like.

In an exemplary embodiment, a non-transitory computer readable storage medium, such as the memory 1932, is also provided that includes computer program instructions executable by the processing component 1922 of the apparatus 1900 to perform the above-described methods.

Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A satellite communication method, comprising:

setting a receiving signal range corresponding to each wave beam in the satellite, wherein the receiving signal ranges corresponding to different wave beams are different, and the receiving signal ranges comprise code elements and/or frequency points;

setting a receiving mode of an uplink signal of each beam according to a receiving signal range corresponding to each beam, wherein the receiving mode comprises the following steps: receiving an uplink signal of a receiving signal range of the receiving device, and receiving an uplink signal of a receiving signal range of an adjacent wave beam;

each beam processes the received uplink signal of each user terminal according to the corresponding receiving mode, wherein the first beam receives a first superposed signal of a first uplink signal from a first user terminal and a second uplink signal from a second user terminal, the second beam receives a second superposed signal of a second uplink signal from the second user terminal and a third uplink signal from a third user terminal, the first uplink signal and the second uplink signal are in the same receiving signal range, the third uplink signal and the second uplink signal are in different receiving signal ranges, and the second beam is a neighboring beam of the first beam,

determining a third uplink signal and a second uplink signal according to the fact that the third uplink signal and the second uplink signal are in different signal receiving ranges;

and determining the first uplink signal according to the second uplink signal and the first superposed signal.

2. The method of claim 1, wherein each beam processes the received uplink signal of each ue according to a corresponding receiving method, comprising:

if a first beam receives a first superposed signal of a first uplink signal from a first user terminal and a second uplink signal from a second user terminal, performing packet loss processing on the first superposed signal;

the first uplink signal and the second uplink signal are both in a first receiving signal range corresponding to the first beam, the second beam is a beam adjacent to the first beam, the uplink signals of the first beam and the second beam are received in a manner of receiving the uplink signals of the first receiving signal range and the second receiving signal range, and the second receiving signal range is different from the first receiving signal range.

3. The method of claim 1, wherein each beam processes the received uplink signal of each ue according to a corresponding receiving method, comprising:

4. A satellite communication device, comprising:

the satellite comprises a first setting module, a second setting module and a third setting module, wherein the first setting module is used for setting a receiving signal range corresponding to each wave beam in a satellite, the receiving signal ranges corresponding to different wave beams are different, and the receiving signal ranges comprise code elements and/or frequency points;

a second setting module, configured to set a receiving manner of the uplink signal of each beam according to a receiving signal range corresponding to each beam, where the receiving manner includes: receiving an uplink signal of a receiving signal range of the receiving device, and receiving an uplink signal of a receiving signal range of an adjacent wave beam;

a processing module, configured to process, by each beam according to a corresponding receiving manner, the received uplink signal of each ue, where the processing manner includes:

a first beam receives a first superposed signal of a first uplink signal from a first user terminal and a second uplink signal from a second user terminal, a second beam receives a second superposed signal of a second uplink signal from the second user terminal and a third uplink signal from a third user terminal, the first uplink signal and the second uplink signal are in the same received signal range, the third uplink signal and the second uplink signal are in different received signal ranges, and the second beam is an adjacent beam of the first beam,

5. The apparatus of claim 4, wherein the processing module comprises:

the first processing submodule is used for performing packet loss processing on a first superposed signal if a first beam receives the first superposed signal of a first uplink signal from a first user terminal and a second uplink signal from a second user terminal;

6. The apparatus of claim 4, wherein the processing module comprises:

7. A satellite communication device, comprising:

a processor;

a memory for storing processor-executable instructions;

wherein the processor is configured to: performing the method of any one of claims 1 to 3.

8. A non-transitory computer readable storage medium having stored thereon computer program instructions, wherein the computer program instructions, when executed by a processor, implement the method of any one of claims 1 to 3.