CN117527039A - Satellite cabin inside-outside wireless communication device and communication method - Google Patents
Satellite cabin inside-outside wireless communication device and communication method Download PDFInfo
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- CN117527039A CN117527039A CN202311404374.5A CN202311404374A CN117527039A CN 117527039 A CN117527039 A CN 117527039A CN 202311404374 A CN202311404374 A CN 202311404374A CN 117527039 A CN117527039 A CN 117527039A
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- 239000013256 coordination polymer Substances 0.000 claims description 36
- 238000009432 framing Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 abstract description 30
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
Abstract
The invention discloses a satellite cabin internal and external wireless communication device and a communication method, wherein the communication device is transmitted by a cabin external wireless device, a plurality of cabin internal communication processors are used for receiving, a flexible and configurable OFDMA transmission technology is adopted among wireless receiving and transmitting devices, each OFDM multi-carrier signal is configured according to different subcarrier channel combinations, the simultaneous transmission and reception of multi-path cabin external load data is realized, the problem that a communication link is opened instantaneously and communication is interrupted due to the use of a satellite-borne slip ring during high-speed data transmission is solved, the function of the satellite-borne slip ring can be effectively replaced, and the high-reliability and high-code-rate data transmission is realized.
Description
Technical Field
The invention discloses an in-cabin and out-cabin wireless communication device and a communication method, and belongs to the field of communication signal processing.
Background
The remote sensing satellite off-cabin solar observation equipment is arranged on a solar sailboard mechanism, and the solar sailboard can track the direction of the sun to rotate slowly in operation, so that the off-cabin mechanism and the cabin body rotate relatively, and data between the two mechanisms are transmitted by adopting a slip ring mode.
The slip ring is a precise mechanical device for realizing signal and current transmission between two relative rotating mechanisms, and transmits an electric signal by means of relative sliding electric contact, but the slip ring has the defects in use:
(1) The service life is easily influenced by the rotation abrasion loss, deformation and the like;
(2) The characteristic of instant open circuit is provided, and unreliable factors exist;
(3) The device is suitable for low-speed (working frequency is below 16 MHz) electric signal transmission;
(4) For high-speed (such as more than 20 Mbps) data transmission, the phenomena of data communication interruption, frame loss, packet loss and the like caused by the instant open circuit characteristic are obvious;
(5) And the on-board slip rings are imported products, and the purchase channels have no risk of transportation.
Disclosure of Invention
The technical solution of the invention is as follows: the satellite cabin internal and external wireless communication device and the communication method overcome the defects of the prior art, and solve the problem that a communication link is instantaneously opened and communication is interrupted due to the use of a satellite-borne slip ring during high-speed data transmission.
The technical scheme of the invention is as follows: an in-cabin and out-of-cabin satellite wireless communication device, the wireless communication device comprising an out-of-cabin wireless device;
the outdoor wireless equipment receives N paths of outdoor load original data and carries out code modulation to obtain N paths of roadbed data; according to the OFDMA multiple access mode, the subcarrier number and the sequence number are distributed to each baseband data, and according to the distributed subcarrier sequence number, N baseband data are input to an IFFT core for OFDM modulation, so that OFDM symbol data are obtained; adding a CP data protection interval in front of OFDM symbol data; generating control signaling; framing a preset universal preamble, a control signaling and OFDM symbol data with a CP data protection interval to obtain a load data frame; the control signaling carries modulation mode, coding rate, data length, working mode and subcarrier division of each road of off-cabin loadConfiguration information and CP configuration information; the working mode refers to a transmitting mode of a load data frame, and is a burst mode or a continuous mode; and transmitting the load data frame in a wireless mode by adopting a working mode appointed in the control instruction. Preferably, the number of IFFT points is 2 i ，i≥6。
The other technical scheme of the invention is as follows: an in-cabin and out-of-cabin satellite wireless communication device comprises N cabin communication processors; wherein:
an in-cabin communication processor which receives a wireless signal carrying a payload data frame; the frame synchronization of the load data frame is realized by capturing a universal preamble in a physical frame structure and carrying out frequency and phase compensation; extracting control signaling according to a preset payload data frame format, and obtaining configuration information of the subcarriers from the control signaling; removing the CP data guard interval to obtain OFDM symbol data; carrying out FFT on OFDM symbol data to obtain all subcarrier data; and demodulating the subcarrier data corresponding to the N paths of extravehicular loads according to the subcarrier configuration information, and recovering the N paths of extravehicular load original data. Preferably, the FFT point number is 2 i ，i≥6。
Preferably, the length of the CP data guard interval is 1/4 or 1/8 or 1/16 of OFDM symbol data.
The invention also has the technical scheme that: a satellite intra-cabin and external wireless communication method, comprising the steps of:
s1-1, receiving N paths of out-of-cabin load original data and performing coded modulation to obtain N paths of roadbed zone data, wherein N is greater than or equal to 1;
s1-2, distributing the number and sequence number of subcarriers of each baseband data according to an OFDMA multiple access mode, and inputting N baseband data to an IFFT core for OFDM modulation according to the distributed subcarrier sequence number to obtain OFDM symbol data;
s1-3, adding a CP data protection interval in front of OFDM symbol data;
s1-4, generating a control signaling; the control signaling carries modulation mode, coding rate, data length, working mode, subcarrier allocation information and CP configuration information of each path of off-board load; the working mode refers to a transmitting mode of a load data frame, and is a burst mode or a continuous mode;
s1-5, adding a CP data protection interval in front of OFDM symbol data; framing a preset universal preamble, a control signaling and OFDM symbol data with a CP data protection interval to obtain a load data frame;
s1-6, transmitting the load data frame in a wireless mode by adopting a working mode appointed in a control instruction. Preferably, the number of IFFT points is 2 i ，i≥6。
The invention adopts the technical scheme that: a satellite intra-cabin and external wireless communication method, comprising the steps of:
s2-1, receiving a wireless signal carrying a load data frame;
s2-2, realizing frame synchronization of the load data frame by capturing a universal preamble in a physical frame structure and carrying out frequency and phase compensation;
s2-3, extracting control signaling according to a preset load data frame format, and obtaining subcarrier configuration information from the control signaling; the control signaling carries modulation mode, coding rate, data length, working mode, subcarrier allocation information and CP configuration information of each path of off-board load; the working mode refers to a transmitting mode of a load data frame, and is a burst mode or a continuous mode;
s2-4, removing the CP data guard interval to obtain OFDM symbol data;
s2-5, carrying out FFT on the OFDM symbol data to obtain all subcarrier data;
s2-6, demodulating the subcarrier data corresponding to the N paths of extra-cabin loads according to the subcarrier configuration information, and recovering the N paths of extra-cabin load original data.
Preferably, the FFT point number is 2 i ，i≥6。
Preferably, the length of the CP data guard interval is 1/4 or 1/8 or 1/16 of OFDM symbol data.
Compared with the prior art, the invention has the advantages that:
(1) The invention adopts the wireless communication device to realize the communication inside and outside the cabin, can replace the wireless communication device outside the cabin of the satellite-borne slip ring, does not have the problem of communication interruption caused by the instant open of a communication link of the satellite-borne slip ring, and can replace the satellite-borne slip ring to realize high-speed and reliable data transmission;
(2) The invention expands the wireless communication between the transmitter and the receiver into the wireless communication application of one transmitter and more receiver, realizes the parallel transmission of multi-user data frames, reduces the competition times of transmission opportunities required by transmitting the same data quantity, thereby improving the frequency spectrum efficiency, having flexible multipath resistance, improving the link reliability and exceeding the effect of the satellite-borne slip ring.
(3) The invention adopts OFDMA transmission mode, the subcarrier channel is flexibly configured, and multiple users share the bandwidth of multiple carriers;
(4) The CP data protection interval of the invention can be adjusted along with the OFDM symbol period, and is flexible against multipath.
Drawings
FIG. 1 is a block diagram of transmission of outboard payload observation data via a wired slip ring;
FIG. 2 is a block diagram of wireless transmission with off-board load observation data;
FIG. 3 is a block diagram of a transmitter-receiver implemented by an in-cabin and out-of-cabin wireless communication device of the present invention;
fig. 4 is a block diagram of different subcarrier channel transmissions and receptions in accordance with the present invention;
fig. 5 is a block diagram of an example subcarrier channel allocation in accordance with the present invention;
FIG. 6 is a block diagram of a payload data frame structure of the present invention;
fig. 7 is a CP data guard interval extraction block diagram of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention provides an in-cabin and out-cabin wireless communication device and a communication method of a satellite. According to the method, an OFDM multi-carrier access method is utilized, each OFDM multi-carrier signal is distributed to a plurality of user data according to different subcarrier channel combinations for use, and the multi-channel user data are transmitted and received wirelessly at the same time, so that the multi-user data transmission efficiency of the system is improved, and the system can be used for completely replacing a satellite-borne slip ring, as shown in figures 1 and 2.
The invention provides an in-cabin and out-cabin wireless communication device of a satellite, which comprises: an off-deck wireless device and an N-deck communication processor.
The wireless equipment outside the cabin and the communication processor inside the cabin are composed of four parts of hardware including a receiving and transmitting antenna, a duplexer, a microwave channel unit and a digital processing unit. The receiving and transmitting antenna receives and transmits radio signals, the duplexer enables the receiving and transmitting antenna to work simultaneously, the microwave channel unit carries out variable frequency filtering, and the digital processing unit completes the wireless signal modulation and demodulation function.
The outdoor wireless equipment receives N paths of outdoor load original data and carries out code modulation to obtain N paths of roadbed data; according to the OFDMA multiple access mode, the subcarrier number and the sequence number are distributed to each baseband data, and according to the distributed subcarrier sequence number, N baseband data are input to an IFFT core for OFDM modulation, so that OFDM symbol data are obtained; adding a CP data protection interval in front of OFDM symbol data; generating control signaling; framing a preset universal preamble, a control signaling and OFDM symbol data with a CP data protection interval to obtain a load data frame; the control signaling carries subcarrier configuration information, working mode information and CP configuration information of each path of off-cabin load; the working mode refers to a transmitting mode of a load data frame, and is a burst mode or a continuous mode; and transmitting the load data frame in a wireless mode by adopting a working mode appointed in the control instruction.
An in-cabin communication processor which receives a wireless signal carrying a payload data frame; the frame synchronization of the load data frame is realized by capturing a universal preamble in a physical frame structure and carrying out frequency and phase compensation; extracting control signaling according to a preset payload data frame format, and obtaining configuration information of the subcarriers from the control signaling; removing the CP data guard interval to obtain OFDM symbol data; carrying out FFT on OFDM symbol data to obtain all subcarrier data; and demodulating the subcarrier data corresponding to the N paths of extravehicular loads according to the subcarrier configuration information, and recovering the N paths of extravehicular load original data.
The number of FFT/IFFT points is designed according to the system requirement and is generally 2 i (i=6, 7, 8.) typical values are herein256, thus determining a total of 256 subcarriers in the OFDM multi-carrier system.
Through the short-distance wireless communication between the transceiver devices, the satellite-outside-cabin load data transmission system can meet the requirement of high-speed and reliable transmission of various kinds of satellite-outside-cabin load data.
As shown in fig. 3, in a specific embodiment of the present invention, an off-board wireless device is installed on a solar sailboard mechanism and is responsible for receiving different types of load raw data outside the cabin, integrating and arranging multiple paths of load raw data through processing modes such as baseband interface convergence, multi-carrier bandwidth matching, and the like, and performing code modulation to obtain N roadbed band data; according to the OFDMA multiple access mode, the number and the sequence number of subcarriers are allocated to each baseband data, and according to the allocated subcarrier sequence numbers, N baseband data are input to 256-point IFFT cores for OFDM modulation, so that OFDM symbol data are obtained; adding a CP data protection interval according to the signal environment; meanwhile, generating control signaling and giving the allocation state of each path of load data; and finally framing and transmitting according to the physical frame structure, wherein the sequence is the universal lead code, the control signaling and the OFDM symbol data. The external interfaces respectively LVDS and RS422 support solar observation service data input of different speed ranges, and all interfaces can be expanded according to the load quantity.
As shown in fig. 4, the N intra-cabin communication processors all receive wireless signals, search for a universal preamble according to a physical frame format, perform frame synchronization to find out valid data start, analyze control signaling, obtain a working mode and a subcarrier channel allocation mode, eliminate CP, extract OFDM symbol data and perform 256-point FFT to obtain 256 subcarrier data, and according to subcarrier configuration information, each intra-cabin communication processor only demodulates and recovers different extra-cabin load data for its own subcarrier data and outputs the data to devices connected with the extra-cabin communication processor.
Preferably, the subcarriers include fixed zero frequency subcarriers, direct current subcarriers, pilot subcarriers, and data subcarriers;
and fixing the zero frequency subcarrier which is used for protecting the interval and avoiding adjacent channel interference.
A direct current subcarrier for removing a direct current component of the wireless signal;
pilot frequency sub-carrier wave, which is used for frequency and channel estimation and assists accurate demodulation synchronization;
the data may be subcarrier-available for modulating subcarrier data.
As shown in fig. 4, an example of subcarrier channel allocation uses an OFDMA multicarrier transmission scheme, which is 256-point FFT/IFFT per symbol, and thus has 256 subcarriers in total. The invention flexibly configures 256 sub-carriers according to the number of users and the data volume, adjusts the merging number of adjacent sub-carriers to adapt to the requirements of different service data bandwidths, and needs to ensure a certain number of idle load waves as a protection interval.
The number N of external interfaces and the sequence number of sub-carriers of the wireless equipment outside the cabin are determined according to the rate by the following method:
s1, determining the number of external interfaces N according to the system requirement, determining the number of load inputs outside the cabin and the total rate requirement, wherein the number of the external interfaces N is not too much, the transmission rate of each path of data source is not less than 1 and not more than 9, the total rate of N paths of data sources is matched with the transmission bandwidth in principle, and otherwise, the number of subcarriers is not enough to be distributed;
s2, the total number of subcarriers is 256, corresponding to positive and negative subcarriers-128- +128, and the number of the subcarriers is 1-256, and the fixed subcarriers are as follows: zero frequency subcarrier, direct current subcarrier, pilot frequency subcarrier, used for guard interval, avoid adjacent channel interference, pilot frequency carrier is used for frequency and channel estimation, assist accurate demodulation synchronization, can not be directly allocated to data;
s3, fixing zero frequency subcarriers, and 6 on the left: -128 to-123, 5 on the right: 124-128;
s4, direct current subcarriers: middle 7: -3- +4 or the middle 3: -1 to +2;
s5, pilot frequency subcarrier: 18-116, -102, -90, -76, -62, -48, -36, -22, -10, 22, 36, 48, 62, 76, 90, 102, 116;
s6, if N=9, supporting the simultaneous transmission of 9 interface data, dividing the available subcarriers into 9 subcarrier channels, wherein each interface has similar speed, each interface is allocated with 26 subcarriers, and the system defaults to remove the unavailable subcarriers;
s7, if N=8, combining two adjacent 26 sub-carrier channels into one 52 sub-carrier channel, distributing the 52 sub-carrier channel to an interface with higher speed for use, and removing the unavailable sub-carriers by default;
s8, analogizing in sequence, the transmission of a higher interface rate can be realized through the combination of adjacent sub-channels, and meanwhile, the number of interfaces can be reduced;
and S9, if N=1, the system only has one external interface, monopolizes the full channel, supports the highest rate at the moment, uses subcarrier numbers 1-256, and removes the unavailable subcarriers by default.
In another embodiment of the present invention, the subcarrier allocation is as follows:
(1) Combining 26 adjacent subcarriers into one channel, then dividing 256 subcarriers into 9 independent subcarrier channels, and supporting 9 users to simultaneously transmit data, wherein each subchannel is 2MHz;
(2) Combining 52 adjacent sub-carriers into one channel, then dividing 256 sub-carriers into 4 independent sub-carrier channels and 1 middle 26 sub-carrier channels, supporting 5 users to transmit data simultaneously, wherein the sub-channels consist of 2MHz and 4 MHz;
(3) Combining 106 adjacent subcarriers into one channel, 256 subcarriers are divided into 2 independent subcarrier channels and 1 middle 26 subcarrier channels, 3 users are supported to simultaneously transmit data, and the subchannels consist of 2MHz and 8 MHz;
(4) Combining 245 adjacent subcarriers into one channel, 256 subcarriers are divided into 1 independent subcarrier channels, and one user has the exclusive 20MHz bandwidth;
(5) The method can be used by intersecting 1), 2) and 3), and simultaneously allocates the bandwidths of 2MHz, 4MHz and 8MHz according to different traffic, and transmits high-grade, medium-grade and low-grade business data;
(6) Some of the remaining subcarriers are used for guard intervals to avoid interfering with adjacent channels, some are used for DC or pilot to provide frequency and channel estimates for aiding in accurate demodulation.
Besides the above-mentioned subcarrier configuration composition, the system also supports other types of subcarrier channels to flexibly combine, and can specify how many adjacent subcarriers are combined into a channel to use according to the size of the user's requirement, the specified mode is identified by the control signaling in the physical frame structure, and the receiving end can obtain the subcarrier channel allocation information of the receiving user after resolving the signaling.
As shown in fig. 5, a payload data frame structure is mainly composed of fields such as a generic preamble, control signaling, payload data, padding (not necessary), and the like.
The universal preamble consists of two sections of known continuous long sequences, which are used for indicating the initial transmission of frames, and performing frame accurate synchronization, channel estimation and compensation under the condition of low signal-to-noise ratio.
The control signaling is an OFDM symbol period time and is used for telling the working mode of the receiving end and subcarrier allocation information.
The data field is payload data and forms an integer multiple of OFDM modulation symbols together with the padding field.
As shown in fig. 6, the control signaling carries important information of each data frame, and the control signaling carries modulation mode, coding rate, data length, working mode, subcarrier allocation information and CP configuration information of each path of off-board load; the working mode refers to a transmission mode of a load data frame, and is a burst mode or a continuous mode.
As shown in fig. 7, the cp is a data guard interval of each OFDM symbol, and can be flexibly configured to 1/4, 1/8, and 1/16 of the length of the OFDM modulation symbol period according to the channel environment.
The specific steps of the multi-carrier transmission mode for flexibly configuring each OFDM multi-carrier signal according to different sub-carrier channel combinations are as follows:
step one: the number of external interfaces N and the total transmission rate R of the external wireless equipment and the number N of the communication processors in the cabin are determined according to the system requirements, and N values (N is more than or equal to 1, but not without limiting, and not more than 10) are obtained.
Step two: the number of FFT/IFFT points is designed according to the system requirement and is generally 2 i (i=6, 7, 8.) a typical value is 256 here, thus determining a total of 256 subcarriers in an OFDM multicarrier system.
Step three: a part of subcarriers in the system is used as a guard interval or DC (direct current) or pilot frequency to avoid adjacent channel interference, so that N paths (including n=1) of load data are required to occupy no more than 242 total subcarriers. At this time, N paths (including n=1) of load data occupy 242 subcarrier positions at the same time, each path of data can flexibly allocate subcarrier occupying sequence number ranges, cannot overlap, and the sum cannot exceed 242 subcarriers.
Step four: if n=1, the system is in an transmitting and receiving working mode, the wireless equipment outside the cabin frames according to the agreed load data frame structure, compiles control signaling information on the basis of a universal preamble, modulates the unique one-path extra-cabin load data to all 242 subcarriers through IFFT to form OFDM symbol data, adds a CP to each OFDM symbol data, and exclusively uses the whole multicarrier channel to transmit at high speed; if N >1, the system is in an N-channel receiving working mode, the outdoor wireless equipment frames according to the agreed physical frame structure, on the basis of the universal preamble, N-channel outdoor load data sources are compiled with corresponding N-channel control signaling information, the N-channel load data sources jointly occupy a multi-carrier channel, each-channel load data source occupies an allocated sub-carrier channel to transmit data, the outdoor wireless transmitter collects all N-channel load data according to the configured sub-carrier channel mapping relation and modulates the N-channel load data onto 242 sub-carriers to form OFDM symbols, CP is added to each OFDM symbol, and each data frame transmitted each time contains each-channel load data. The step is suitable for supporting burst and continuous working modes under the condition of low signal-to-noise ratio of satellite channel space environment, and is convenient for accurately assisting in capturing synchronization under the condition of low signal-to-noise ratio.
Step five: n (N is more than or equal to 1) intra-cabin communication processors receive wireless signals, obtain frame synchronization of effective data by capturing a preamble in a physical frame structure, obtain information such as all working modules and subcarrier configuration by extracting control signaling information, remove a CP data protection interval, obtain all subcarrier data after 256-point FFT, and each intra-cabin communication processor extracts data in a corresponding subcarrier sequence according to subcarrier channel control information to carry out subsequent demodulation, so that N paths of load original data can be recovered.
In summary, the device of the invention utilizes the characteristic of OFDM multi-carrier, flexibly configures the subcarrier channels according to the requirements of the data source outside the cabin, and distributes different subcarrier sequence number ranges, so that multiple paths of user data are transmitted simultaneously, the multi-user transmission efficiency is improved, and the problems that the rate bottleneck of the existing slip ring wired link and the traditional one-to-one transmission cannot adapt to one-to-many user application scenarios are solved; meanwhile, by processing the high-efficiency physical layer frame format, the wireless communication device can adapt to burst or continuous OFDM signal modulation and demodulation, thereby increasing the anti-interference multipath function, improving the transmission rate and achieving the purpose of high-speed transmission.
The invention is not described in detail in the field of technical personnel common knowledge.
Claims (10)
1. An in-cabin and out-of-cabin satellite wireless communication device is characterized by comprising out-of-cabin wireless equipment;
the outdoor wireless equipment receives N paths of outdoor load original data and carries out code modulation to obtain N paths of roadbed data; according to the OFDMA multiple access mode, the subcarrier number and the sequence number are distributed to each baseband data, and according to the distributed subcarrier sequence number, N baseband data are input to an IFFT core for OFDM modulation, so that OFDM symbol data are obtained; adding a CP data protection interval in front of OFDM symbol data; generating control signaling; framing a preset universal preamble, a control signaling and OFDM symbol data with a CP data protection interval to obtain a load data frame; the control signaling carries modulation mode, coding rate, data length, working mode, subcarrier allocation information and CP configuration information of each path of off-board load; the working mode refers to a transmitting mode of a load data frame, and is a burst mode or a continuous mode; and transmitting the load data frame in a wireless mode by adopting a working mode appointed in the control instruction.
2. The satellite intra-cabin external wireless communication device according to claim 1, wherein the number of IFFT points is 2 i ，i≥6。
3. The satellite cabin inside-outside wireless communication device is characterized by comprising N cabin inside communication processors; wherein:
an in-cabin communication processor which receives a wireless signal carrying a payload data frame; the frame synchronization of the load data frame is realized by capturing a universal preamble in a physical frame structure and carrying out frequency and phase compensation; extracting control signaling according to a preset payload data frame format, and obtaining configuration information of the subcarriers from the control signaling; removing the CP data guard interval to obtain OFDM symbol data; carrying out FFT on OFDM symbol data to obtain all subcarrier data; and demodulating the subcarrier data corresponding to the N paths of extravehicular loads according to the subcarrier configuration information, and recovering the N paths of extravehicular load original data.
4. An in-cabin and out-of-cabin satellite radio communication device according to claim 1, wherein said FFT point number is 2 i ，i≥6。
5. An indoor and outdoor satellite communication device according to any one of claims 1 to 4, wherein the CP data guard interval has a length of 1/4 or 1/8 or 1/16 of OFDM symbol data.
6. The satellite cabin inside-outside wireless communication method is characterized by comprising the following steps of:
s1-1, receiving N paths of out-of-cabin load original data and performing coded modulation to obtain N paths of roadbed zone data, wherein N is greater than or equal to 1;
s1-2, distributing the number and sequence number of subcarriers of each baseband data according to an OFDMA multiple access mode, and inputting N baseband data to an IFFT core for OFDM modulation according to the distributed subcarrier sequence number to obtain OFDM symbol data;
s1-3, adding a CP data protection interval in front of OFDM symbol data;
s1-4, generating a control signaling; the control signaling carries modulation mode, coding rate, data length, working mode, subcarrier allocation information and CP configuration information of each path of off-board load; the working mode refers to a transmitting mode of a load data frame, and is a burst mode or a continuous mode;
s1-5, adding a CP data protection interval in front of OFDM symbol data; framing a preset universal preamble, a control signaling and OFDM symbol data with a CP data protection interval to obtain a load data frame;
s1-6, transmitting the load data frame in a wireless mode by adopting a working mode appointed in a control instruction.
7. The method for satellite intra-cabin external wireless communication according to claim 6, wherein the number of IFFT points is 2 i ，i≥6。
8. The satellite cabin inside-outside wireless communication method is characterized by comprising the following steps of:
s2-1, receiving a wireless signal carrying a load data frame;
s2-2, realizing frame synchronization of the load data frame by capturing a universal preamble in a physical frame structure and carrying out frequency and phase compensation;
s2-3, extracting control signaling according to a preset load data frame format, and obtaining subcarrier configuration information from the control signaling; the control signaling carries modulation mode, coding rate, data length, working mode, subcarrier allocation information and CP configuration information of each path of off-board load; the working mode refers to a transmitting mode of a load data frame, and is a burst mode or a continuous mode;
s2-4, removing the CP data guard interval to obtain OFDM symbol data;
s2-5, carrying out FFT on the OFDM symbol data to obtain all subcarrier data;
s2-6, demodulating the subcarrier data corresponding to the N paths of extra-cabin loads according to the subcarrier configuration information, and recovering the N paths of extra-cabin load original data.
9. The method for satellite intra-cabin external wireless communication according to claim 8, wherein the number of FFT points is 2 i ，i≥6。
10. A satellite intra-cabin external wireless communication method according to any one of claims 6 to 9, wherein the CP data guard interval has a length of 1/4 or 1/8 or 1/16 of OFDM symbol data.
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| CN202311404374.5A CN117527039A (en) | 2023-10-26 | 2023-10-26 | Satellite cabin inside-outside wireless communication device and communication method |
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| CN202311404374.5A CN117527039A (en) | 2023-10-26 | 2023-10-26 | Satellite cabin inside-outside wireless communication device and communication method |
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