CN115412418B - Pilot frequency design method, medium and device suitable for OTFS multi-antenna port - Google Patents
Pilot frequency design method, medium and device suitable for OTFS multi-antenna port Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2639—Modulators using other transforms, e.g. discrete cosine transforms, Orthogonal Time Frequency and Space [OTFS] or hermetic transforms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/26532—Demodulators using other transforms, e.g. discrete cosine transforms, Orthogonal Time Frequency and Space [OTFS] or hermetic transforms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
Abstract
The invention provides a pilot frequency design method, a medium and a device suitable for OTFS multi-antenna ports; according to the method, pilot frames at different positions are inserted into delay-Doppler planes corresponding to multiple antennas, pilot data exist in one of the delay-Doppler plane pilot frames corresponding to different antennas, and any data are not placed in other pilot frames; at the receiving end, channel information among different antennas is estimated according to different pilot frame data, so that a multi-antenna channel matrix is obtained, multi-stream data can be demodulated in a time-frequency domain by utilizing the channel matrix, and therefore the throughput of an OTFS system under a high mobile environment is improved, and the OTFS technology and the MIMO space multiplexing technology can be perfectly combined.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a pilot design method, medium, and apparatus suitable for OTFS multiple antenna ports.
Background
In some high mobility wireless communication environments, orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) systems are susceptible to inter-carrier interference caused by doppler effects in fast fading channels. In order to effectively improve the problem of high doppler sensitivity in OFDM modulation, orthogonal time-frequency space (Orthogonal Time Frequency Space, OTFS) modulation techniques are proposed. OTFS transmits channel symbols on a delay-doppler plane that captures the delay and doppler shifts present in the wireless channel.
However, OTFS acquires information such as delay and doppler shift in the delay-doppler plane, and needs to insert pilot data in the delay-doppler plane, in the prior art, a continuous area is defined in the delay-doppler plane as a pilot area, pilot data is inserted in the middle position of the pilot area, and the rest positions are not filled with data, so that the data value is kept to be 0.
In the prior art, an OTFS (optical transport system) generally performs single-antenna single-stream information transmission, and performs pilot frequency data design on a corresponding delay-Doppler plane on a single port, but a MIMO (multiple input multiple output) space division multiplexing technology exists for a high-speed mobile scene, so that the transmission throughput is improved; however, in the OTFS field, the single-antenna pilot design is not suitable for the multi-antenna environment, and thus the MIMO spatial multiplexing technique cannot be used in the OTFS field, so that the multi-antenna channel cannot be estimated effectively.
Disclosure of Invention
The invention aims to provide a pilot frequency design method, medium and device suitable for an OTFS multi-antenna port, so as to solve the problem that a MIMO space multiplexing technology cannot be used in the OTFS field, and thus a multi-antenna channel cannot be estimated effectively.
The invention provides a pilot frequency design method suitable for OTFS multi-antenna ports, which comprises the following steps:
step 1: the transmitting end is provided with K flow data, K ports, each port corresponds to the flow data, K delay-Doppler planes with M being N are prepared, and K delay-Doppler plane space values are initialized to be 0; n is the time dimension length of the delay-doppler plane and M is the frequency domain dimension length of the delay-doppler plane;
step 2: the time delay-Doppler plane of the I M corresponding to the port I, wherein the time axis of the pilot frame corresponding to the port I is t (I-1) to t I, I is more than or equal to 0 and less than or equal to K-1, and t is the width of the time dimension of the pilot frame;
step 3: the frequency axis of the pilot frame corresponding to the port I is f (I-1) to f I, wherein I is more than or equal to 0 and less than or equal to K-1, and f is the width of the frequency dimension of the pilot frame;
step 4: marking K corresponding pilot frame positions in the delay-Doppler plane of the I < M > -N corresponding to the port I, and filling the area outside the pilot frame with data to be transmitted;
step 5: filling data 0 according to all marked pilot frames in the delay-Doppler plane of the I < th > M < th > corresponding to the port I, and filling pilot data in the middle position of the I < th > pilot frame;
step 6: inserting a pilot frame and pilot data into the rest ports according to the mode of inserting the pilot frame and the pilot data into the delay-Doppler plane of the I (M x N) corresponding to the port I in the steps 2-5, and obtaining K delay-Doppler planes after resource mapping;
step 7: and respectively carrying out OTFS (optical transport stream) transformation according to the delay-Doppler planes after the K resources are mapped, and obtaining final K-stream OTFS data.
Further, in the step 2, the t value determines the anti-frequency deviation performance, and t is more than or equal to 0 and less than or equal to N/K-1.
Further, in the step 3, the f value determines the time offset resistance, and f is more than or equal to 0 and less than or equal to M/K-1.
Further, the pilot data value in step 5 is
Further, the method for performing OTFS transformation in step 7 is:
where X is the data of the delay-doppler plane after mapping the ith resource and X is the data after OTFS transformation.
The invention also provides a computer terminal storage medium, which stores computer terminal executable instructions for executing the pilot design method applicable to the OTFS multi-antenna port.
The present invention also provides a computing device comprising:
at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the pilot design method applicable to OTFS multi-antenna ports as described above.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
according to the invention, pilot frames at different positions are inserted in the time delay-Doppler plane corresponding to multiple antennas, and at the same time, one pilot frame of the time delay-Doppler plane corresponding to different antennas has pilot data, and other pilot frames do not contain any data; at the receiving end, channel information among different antennas is estimated according to different pilot frame data, so that a multi-antenna channel matrix is obtained, multi-stream data can be demodulated in a time-frequency domain by utilizing the channel matrix, and therefore the throughput of an OTFS system under a high mobile environment is improved, and the OTFS technology and the MIMO space multiplexing technology can be perfectly combined.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly describe the drawings in the embodiments, it being understood that the following drawings only illustrate some embodiments of the present invention and should not be considered as limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a pilot design method suitable for OTFS multiple antenna ports in an embodiment of the present invention.
Fig. 2 is a schematic diagram of a position of a pilot frame corresponding to multiple antennas in a time-frequency domain according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
As shown in fig. 1, this embodiment proposes a pilot design method suitable for OTFS multiple antenna ports, including the following steps:
step 1: the transmitting end is provided with K flow data, K ports, each port corresponds to the flow data, K delay-Doppler planes with M being N are prepared, and K delay-Doppler plane space values are initialized to be 0; n is the time dimension length of the delay-doppler plane and M is the frequency domain dimension length of the delay-doppler plane;
step 2: the time delay-Doppler plane of the I M N corresponding to the port I, the time axis of the pilot frame corresponding to the port I is t (I-1) to t I, wherein I is more than or equal to 0 and less than or equal to K-1, t is the width of the time dimension of the pilot frame, the t value determines the performance of resisting frequency offset, and t is more than or equal to 0 and less than or equal to N/K-1;
step 3: the frequency axis of the pilot frame corresponding to the port I is f (I-1) to f I, wherein I is more than or equal to 0 and less than or equal to K-1, f is the width of the frequency dimension of the pilot frame, and the f value determines the time offset resistance performance, and f is more than or equal to 0 and less than or equal to M/K-1;
step 4: marking K corresponding pilot frame positions in the delay-Doppler plane of the I < M > -N corresponding to the port I, and filling the area outside the pilot frame with data to be transmitted;
step 5: filling data 0 according to all marked pilot frames in the delay-Doppler plane of the ith MxN corresponding to the port I, and filling pilot data in the middle position of the ith pilot frame, wherein the pilot data value is that
Step 6: inserting a pilot frame and pilot data into the rest ports according to the mode of inserting the pilot frame and the pilot data into the delay-Doppler plane of the I (M x N) corresponding to the port I in the steps 2-5, and obtaining K delay-Doppler planes after resource mapping;
step 7: according to the K resource mapped delay-Doppler planes, OTFS conversion is respectively carried out to obtain final K-stream OTFS data; the method for carrying out OTFS transformation comprises the following steps:
wherein X is the data of the delay-Doppler plane after the mapping of the I-th resource, and X is the data after the OTFS transformation; n is 0-N-1, M is 0-M-1, k is 0-N-1, and l is 0-M-1.
Examples: taking 8-port 8-stream MIMO as an example, OTFS precoding is performed, where the delay-doppler plane is 3276×64, i.e. m=2736, n=64, and the above-mentioned pilot design method applicable to OTFS multi-antenna ports specifically includes:
s1, initializing 8 delay-Doppler planes with the size of 3276 x 64, and initializing 8 delay-Doppler plane space values to be 0;
s2, dividing different ports on a pilot frame time axis for 8 delay-Doppler planes according to FIG. 2; as shown in fig. 2, there are 8 different areas of pilot frames on each delay-doppler plot, with the abscissa corresponding to the pilot frame time axis and the ports corresponding to the pilot frames in the time domain range shown in table 1.
Table 1, pilot frame time axis range:
s3, dividing different ports on a pilot frequency frame frequency axis for 8 delay-Doppler planes according to FIG. 2; there are 8 distinct regions of pilot frames on each delay-doppler plot as shown in fig. 2, where the ordinate corresponds to frequency and the range of frequencies for the pilot frames for the ports is shown in table 2.
Table 2, pilot frame frequency axis range:
| port number | Frequency axis value |
| 1 | 1 to 100 |
| 2 | 411 to 510 |
| 3 | 821 to 920 |
| 4 | 1231 to 1330 |
| 5 | 1641 to 1740 |
| 6 | 2051 to 2150 |
| 7 | 2461 to 2560 |
| 8 | 2871 to 2970 |
S4, 8 delay-doppler planes of 3276 x 64 corresponding to the 8 ports, marking each delay-doppler plane according to the position of the pilot frame, and dividing the data into 8 streams of data, wherein each stream of data is mapped to a region outside the pilot frame in the corresponding delay-doppler plane, such as a grid region in fig. 2, and is a data filling region;
and (5) filling pilot data in the central position of the corresponding pilot frame in each time delay-Doppler plane in 8 pilot frames corresponding to 8 ports, wherein the pilot data value is 457.8908, and filling pilot data in the central position and the plane pilot frame corresponding to each pilot frame, wherein as shown in table 3, the pilot frames corresponding to each time delay-Doppler plane need to be filled with 0, and only the filled pilot positions need to be filled with pilot data.
Table 3, pilot filling position:
s6, according to the 8 delay-Doppler plane diagrams after the mapping data and the pilot frequency, OTFS conversion is carried out according to the following formula, and final frequency domain data X is obtained:
where m=2736, n=64.
Furthermore, in some embodiments, a computer terminal storage medium is provided, storing computer terminal executable instructions for performing the pilot design method applicable to OTFS multi-antenna ports as described in the previous embodiments. Examples of the computer storage medium include magnetic storage media (e.g., floppy disks, hard disks, etc.), optical recording media (e.g., CD-ROMs, DVDs, etc.), or memories such as memory cards, ROMs, or RAMs, etc. The computer storage media may also be distributed over network-connected computer systems, such as stores for application programs.
Furthermore, in some embodiments, a computing device is presented comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the pilot design method applicable to OTFS multi-antenna ports as described in the previous embodiments. Examples of computing devices include PCs, tablets, smartphones, PDAs, etc.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The pilot frequency design method suitable for the OTFS multi-antenna port is characterized by comprising the following steps:
step 1: the transmitting end is provided with K flow data, K ports, each port corresponds to the flow data, K delay-Doppler planes with M being N are prepared, and K delay-Doppler plane space values are initialized to be 0; n is the time dimension length of the delay-doppler plane and M is the frequency domain dimension length of the delay-doppler plane;
step 2: the time delay-Doppler plane of the I M corresponding to the port I, wherein the time axis of the pilot frame corresponding to the port I is t (I-1) to t I, I is more than or equal to 0 and less than or equal to K-1, and t is the width of the time dimension of the pilot frame;
step 3: the frequency axis of the pilot frame corresponding to the port I is f (I-1) to f I, wherein I is more than or equal to 0 and less than or equal to K-1, and f is the width of the frequency dimension of the pilot frame;
step 4: marking K corresponding pilot frame positions in the delay-Doppler plane of the I < M > -N corresponding to the port I, and filling the area outside the pilot frame with data to be transmitted;
step 5: filling data 0 according to all marked pilot frames in the delay-Doppler plane of the I < th > M < th > corresponding to the port I, and filling pilot data in the middle position of the I < th > pilot frame;
step 6: inserting a pilot frame and pilot data into the rest ports according to the mode of inserting the pilot frame and the pilot data into the delay-Doppler plane of the I (M x N) corresponding to the port I in the steps 2-5, and obtaining K delay-Doppler planes after resource mapping;
step 7: and respectively carrying out OTFS (optical transport stream) transformation according to the delay-Doppler planes after the K resources are mapped, and obtaining final K-stream OTFS data.
2. The pilot design method for OTFS multiple antenna ports according to claim 1, wherein in step 2, the size of t determines the performance of anti-frequency offset, and t is greater than or equal to 0 and less than or equal to N/K-1.
3. The pilot design method for OTFS multiple antenna ports according to claim 1, wherein the f-value in step 3 determines time offset resistance, and f is 0.ltoreq.m/K-1.
4. The method for designing pilot frequency for OTFS multiple antenna port according to claim 1, wherein the pilot data value in step 5 is
5. The method for designing a pilot frequency suitable for an OTFS multiple antenna port according to claim 1, wherein the method for performing OTFS transformation in step 7 is as follows:
wherein X is the data of the delay-Doppler plane after the mapping of the I-th resource, and X is the data after the OTFS transformation; n is 0-N-1, M is 0-M-1, k is 0-N-1, and l is 0-M-1.
6. A computer terminal storage medium storing computer terminal executable instructions for performing the pilot design method for OTFS multiple antenna ports according to any one of claims 1-5.
7. A computing device, comprising:
at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the pilot design method for an OTFS multi-antenna port according to any one of claims 1-5.
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