CN109936403B - Synchronization and receiving method and receiving equipment of multi-antenna system - Google Patents
Synchronization and receiving method and receiving equipment of multi-antenna system Download PDFInfo
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Abstract
The embodiment of the invention provides a synchronization and receiving method and receiving equipment of a multi-antenna system, wherein the method comprises the following steps: acquiring a first symbol sequence of a received signal corresponding to each antenna in a plurality of antennas; based on the first symbol sequence corresponding to each antenna, noise estimation processing is carried out on each antenna, and a noise estimation value corresponding to each antenna is obtained; performing maximum ratio combining processing on the first symbol sequences of the multiple antennas based on the noise estimation value corresponding to each antenna to obtain a second symbol sequence after the multiple antennas are combined; carrying out first synchronous timing detection processing on the second symbol sequence to determine a first synchronous position; and based on the first synchronous position, performing interpolation timing compensation processing and extraction processing on the first symbol sequence corresponding to each antenna respectively to obtain a third symbol sequence corresponding to each antenna. The method and the receiving equipment provided by the embodiment of the invention can realize signal receiving and synchronous processing based on multiple antennas and improve the communication quality.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a synchronization and receiving method and receiving equipment of a multi-antenna system.
Background
Police Digital Trunking (PDT) standard is a Trunking communication standard with proprietary intellectual property rights in china, and can meet the needs of users in most Trunking communication industries by focusing on the development direction of Digital intercom technology in the future. The PDT standard fully considers the situation of China, references and innovatively designs international mature standard technologies (such as Tetra, P25, DMR, MPT1327 and the like), follows five principles of high cost performance, safety and confidentiality, large area system, expandability and backward compatibility, and effectively solves the problem of converged communication of various emergency communication networks.
The PDT standard is based on the Chinese public security market, gives consideration to different levels of user requirements of counties, cities, provinces and countries and actual network construction requirements, supports low-cost single-base-station system communication, can also achieve efficient large-area system coverage, and meets the construction requirements of national-wide public security emergency communication command networks such as four-level networking. In emergency incidents such as earthquake, wind disaster, social security and the like, the system can be quickly accessed to the existing GIS dispatching platform of public security, realizes the functions of flexible networking, high-efficiency command dispatching, high-quality voice and data transmission and the like, and has the characteristics of quick response, safety and confidentiality.
The PDT standard has the advantages of efficient utilization of spectrum resources, large-area networking mode and smooth transition from analog MPT1327 to digital clustering. The system has the advantages of rich and expandable service functions, backward compatibility, lower system and terminal cost, higher network construction speed and lower overall operation and maintenance cost. In summary, PDT standards have long-term competitive advantages in the field of professional wireless communications. The autonomous security encryption technology is particularly suitable for the secrecy requirements of public security users.
The PDT system employs 4FSK modulation, which is susceptible to adverse effects of interference, channel distortion, noise, etc. during wireless transmission, and has a low communication quality.
Disclosure of Invention
The embodiment of the invention provides a synchronization and receiving method and receiving equipment of a multi-antenna system, which are used for realizing signal receiving and synchronization processing based on multiple antennas and improving communication quality.
A first aspect of an embodiment of the present invention provides a synchronization and receiving method for a multi-antenna system, where the method includes:
acquiring a first symbol sequence of a received signal corresponding to each antenna in a plurality of antennas;
based on the first symbol sequence corresponding to each antenna, noise estimation processing is carried out on each antenna, and a noise estimation value corresponding to each antenna is obtained;
performing maximum ratio combining processing on the first symbol sequences of the multiple antennas based on the noise estimation value corresponding to each antenna to obtain a second symbol sequence after the multiple antennas are combined;
carrying out first synchronous timing detection processing on the second symbol sequence to determine a first synchronous position;
and based on the first synchronous position, performing interpolation timing compensation processing and extraction processing on the first symbol sequence corresponding to each antenna respectively to obtain a third symbol sequence corresponding to each antenna.
Optionally, the obtaining a first symbol sequence of a received signal corresponding to each antenna in the multiple antennas includes:
acquiring receiving signals of a plurality of antennas;
and respectively carrying out demodulation processing and shaping filtering processing on the received signals of each antenna to obtain a first symbol sequence corresponding to each antenna.
Optionally, the performing noise estimation processing on each antenna based on the first symbol sequence corresponding to each antenna to obtain a noise estimation value corresponding to each antenna includes:
for each antenna, performing second synchronous timing detection processing on the first symbol sequence of the antenna to determine a second synchronous position;
performing interpolation timing compensation processing and extraction processing on the first symbol sequence based on the second synchronous position to obtain a fourth symbol sequence;
performing DC removal processing on the fourth symbol sequence to obtain a fifth symbol sequence;
and carrying out difference operation on the fourth symbol sequence and the fifth symbol sequence to obtain a noise estimation value of the antenna.
Optionally, the performing, for each antenna, a second synchronization timing detection process on the first symbol sequence of the antenna to determine a second synchronization position includes:
for each antenna, performing correlation matching processing on a first symbol sequence of the antenna and a preset first synchronization sequence to obtain a position for obtaining a maximum correlation value;
based on the position, a second synchronization position of the first symbol sequence of the antenna is determined.
Optionally, the DC removal processing on the fourth symbol sequence to obtain a fifth symbol sequence includes:
carrying out averaging operation on the fourth symbol sequence to obtain a corresponding DC frequency offset estimation value;
and performing difference processing on the fourth symbol sequence and the DC frequency offset estimation value to obtain a fifth symbol sequence.
Optionally, after performing interpolation timing compensation processing and decimation processing on the first symbol sequence corresponding to each antenna respectively based on the first synchronization position to obtain a third symbol sequence corresponding to each antenna, the method further includes:
and performing soft bit mapping processing and multi-antenna combination processing based on the third symbol sequence corresponding to each antenna to obtain target soft bit sequences corresponding to the multiple antennas.
Optionally, after performing soft bit mapping processing and multi-antenna combining processing based on the third symbol sequence corresponding to each antenna to obtain target soft bit sequences corresponding to the multiple antennas, the method further includes:
and carrying out hard decision processing on the target soft bit sequence.
A second aspect of an embodiment of the present invention provides a receiving apparatus, including:
an obtaining module, configured to obtain a first symbol sequence of a received signal corresponding to each antenna in a plurality of antennas;
the first processing module is used for carrying out noise estimation processing on each antenna based on the first symbol sequence corresponding to each antenna to obtain a noise estimation value corresponding to each antenna;
a second processing module, configured to perform maximum ratio combining processing on the first symbol sequences of the multiple antennas based on the noise estimation value corresponding to each antenna, so as to obtain a second symbol sequence after the multiple antennas are combined;
a third processing module, configured to perform first synchronous timing detection processing on the second symbol sequence, and determine a first synchronous position;
and the fourth processing module is used for respectively carrying out interpolation timing compensation processing and extraction processing on the first symbol sequence corresponding to each antenna based on the first synchronization position to obtain a third symbol sequence corresponding to each antenna.
Optionally, the obtaining module is specifically configured to:
acquiring receiving signals of a plurality of antennas;
and respectively carrying out demodulation processing and shaping filtering processing on the received signals of each antenna to obtain a first symbol sequence corresponding to each antenna.
Optionally, the first processing module includes: the synchronous timing detection module comprises a synchronous timing detection submodule, a first processing submodule, a second processing submodule and an operation submodule;
wherein, for each antenna,
the synchronous timing detection submodule is used for carrying out second synchronous timing detection processing on the first symbol sequence of the antenna and determining a second synchronous position;
the first processing submodule is configured to perform interpolation timing compensation processing and decimation processing on the first symbol sequence based on the second synchronization position to obtain a fourth symbol sequence;
the second processing submodule is used for performing DC removal processing on the fourth symbol sequence to obtain a fifth symbol sequence;
and the operation sub-module is used for carrying out difference operation on the fourth symbol sequence and the fifth symbol sequence to obtain a noise estimation value of the antenna.
Optionally, the synchronous timing detection submodule is specifically configured to:
for each antenna, performing correlation matching processing on a first symbol sequence of the antenna and a preset first synchronization sequence to obtain a position for obtaining a maximum correlation value;
based on the position, a second synchronization position of the first symbol sequence of the antenna is determined.
Optionally, the second processing sub-module is specifically configured to:
carrying out averaging operation on the fourth symbol sequence to obtain a corresponding DC frequency offset estimation value;
and performing difference processing on the fourth symbol sequence and the DC frequency offset estimation value to obtain a fifth symbol sequence.
Optionally, the receiving device further includes:
and the fifth processing module is configured to perform soft bit mapping processing and multi-antenna combining processing based on the third symbol sequence corresponding to each antenna, so as to obtain target soft bit sequences corresponding to the multiple antennas.
Optionally, the receiving device further includes:
and the hard decision module is used for carrying out hard decision processing on the target soft bit sequence.
According to the embodiment of the invention, a first symbol sequence of a received signal corresponding to each antenna in a plurality of antennas is obtained, noise estimation processing is carried out on each antenna based on the first symbol sequence corresponding to each antenna to obtain a noise estimation value corresponding to each antenna, maximum ratio combining processing is carried out on the first symbol sequences of the plurality of antennas based on the noise estimation value corresponding to each antenna to obtain a second symbol sequence after the plurality of antennas are combined, first synchronous timing detection processing is carried out on the second symbol sequence to determine a first synchronous position, interpolation timing compensation processing and extraction processing are respectively carried out on the first symbol sequence corresponding to each antenna based on the first synchronous position to obtain a third symbol sequence corresponding to each antenna, so that signal receiving and synchronous processing based on the plurality of antennas are realized, and communication quality is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a communication system provided by an embodiment of the present invention;
fig. 2 is a flowchart of a synchronization and receiving method of a multi-antenna system according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for estimating antenna noise according to the present embodiment;
FIG. 4 is a schematic diagram of a correlation matching process provided by an embodiment of the present invention;
FIG. 5 is a graph showing the results of the correlation matching of FIG. 4;
FIG. 6 is an enlarged partial schematic view of FIG. 5;
fig. 7 is a schematic structural diagram of a receiving device according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of the first processing module 12 according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "comprises" and "comprising," and any variations thereof, in the description and claims of this invention, are intended to cover non-exclusive inclusions, e.g., a process or an apparatus that comprises a list of steps is not necessarily limited to those structures or steps expressly listed but may include other steps or structures not expressly listed or inherent to such process or apparatus.
Generally, a Police Digital Trunking (PDT) system or a Digital Mobile Radio (DMR) system is specifically a communication system as shown in fig. 1, specifically, binary bits are input to a transmitting device, sequentially undergo symbol mapping, oversampling, shaping filtering, and 4FSK modulation to obtain a modulated signal, the modulated signal is received by a receiving device after channel transmission, and the receiving device receives the modulated signal, and sequentially undergoes 4FSK demodulation, shaping filtering, extraction, and bit mapping to output binary bits. Optionally, in this embodiment, one symbol corresponds to two bits, and when the transmission rate of the binary bits input to the transmitting device is 9.6kb/s, after symbol mapping, the transmission rate of the symbol is 4.8 ksymbol/s.
As shown in fig. 1, the modulated signal s (t) after 4FSK modulation can be expressed as the following formula:
wherein A represents the carrier amplitude, fcRepresenting the carrier frequency, KfDenotes a frequency offset constant, and m (t) denotes a shape-filtered baseband signal.
After passing through the channel, the modulated signal s (t) is affected by channel fading, thermal noise, and the like, and the signal r (t) received by the receiving device can be represented as the following formula:
where h (t) represents fading experienced by the modulated signal s (t), and generally conforms to rayleigh fading characteristics in a sufficiently diffuse environment, and n (t) represents noise or interference introduced at the receiving device.
When the modulated signal s (t) encounters deep fading or strong noise interference, it may cause misjudgment of the receiving device, and seriously affect the receiving performance of the receiving device. In order to solve the problem, the present embodiment provides a synchronization and receiving method for a multi-antenna system, and a processing method for the multi-antenna receiving signal will be described below with reference to a specific embodiment.
The invention provides a synchronization and receiving method of a multi-antenna system, which aims to solve the technical problems in the prior art.
The following describes the technical solutions of the present invention and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 2 is a flowchart of a synchronization and receiving method of a multi-antenna system according to an embodiment of the present invention. The embodiment of the invention provides a method for synchronizing and receiving a multi-antenna system aiming at the technical problems in the prior art, which comprises the following steps:
Optionally, the method for obtaining the first symbol sequence corresponding to each antenna in the multiple antennas in this embodiment may include: the method comprises the steps of firstly obtaining a received signal of each antenna in a plurality of antennas, and then respectively carrying out demodulation processing and shaping filtering processing on the received signal of each antenna to obtain a first symbol sequence corresponding to each antenna. For specific implementation procedures of the demodulation processing and the shaping filtering processing, reference may be made to the prior art, and details are not described here.
Fig. 3 is a flowchart of a method for estimating antenna noise according to this embodiment, and as shown in fig. 3, the method for estimating noise for each antenna includes:
Optionally, in this embodiment, a preset first synchronization sequence having the same sampling frequency as the first symbol sequence of the antenna is used to perform correlation matching with the first symbol sequence of the antenna, so as to obtain a position where a large correlation value is obtained, and a second synchronization position of the first symbol sequence of the antenna is determined according to the position where the large correlation value is obtained. Or, when the second synchronization sequence for performing correlation matching with the first symbol sequence is different from the first symbol sequence in frequency, the second synchronization sequence may be oversampled to obtain a synchronization sequence having the same sampling frequency as the first symbol sequence, and then the first symbol sequence may be subjected to correlation matching based on the synchronization sequence to obtain a position where a large correlation value is obtained, and based on the position, the second synchronization position of the first symbol sequence of the antenna is determined.
For example, fig. 4 is a schematic diagram of a correlation matching process provided by the embodiment of the present invention, and a synchronization sequence (S) with a length of 24 and a speed of 1 × is adopted in fig. 41……S24) Correlation matching is performed with a first symbol sequence having a sampling frequency of 8 times the speed (8D). The result of the correlation matching shown in fig. 4 is shown in fig. 5. The position where the maximum correlation value is obtained is determined according to fig. 5. FIG. 6 is a partial enlarged view of FIG. 5, and it is assumed that the position of the maximum correlation value is n as shown in FIG. 6peak，npeakHas a correlation value of b, npeakThe correlation value at-1 is a, npeakThe correlation value at +1 is c, then the second synchronization position Pos of the first symbol sequence can be obtained by interpolation:
it is understood that this is by way of illustration and not by way of limitation.
The interpolation timing compensation process and the decimation process in this embodiment can be referred to in the prior art, and are not described herein again.
Optionally, in this embodiment, when performing DC removal processing, an averaging operation may be performed on the fourth symbol sequence to obtain a DC frequency offset estimation value corresponding to the antenna, and then a difference processing may be performed on the fourth symbol sequence and the DC frequency offset estimation value to obtain a fifth symbol sequence. The DC removal processing method in this embodiment may refer to the prior art, and is not described here.
And 304, performing difference operation on the fourth symbol sequence and the fifth symbol sequence to obtain a noise estimation value of the antenna.
Optionally, in step 304, a hard decision may be performed on the fourth symbol sequence, and a difference operation may be performed on the fourth symbol sequence and the symbol sequence after the hard decision to obtain a noise sequence, and then noise estimation may be performed based on the noise sequence.
Alternatively, the second symbol sequence may be calculated based on the following formula:
wherein corr (n) is a second symbol sequence after combining the plurality of antennas,
for noise estimation for the ith antenna, corriAnd (N) is a first sequence corresponding to the ith antenna, and N is the number of the antennas.
And 204, performing first synchronous timing detection processing on the second symbol sequence to determine a first synchronous position.
The method of the first synchronous timing detection processing is the same as the method of the second synchronous timing detection processing, and is not described herein again.
Optionally, the manner of executing the interpolation timing compensation process and the decimation process in step 205 may be referred to in the prior art and will not be described herein again.
As can be seen from the implementation process of this embodiment, the process of obtaining the third symbol sequence is a process of performing synchronization processing on the first symbol sequence.
Optionally, after the synchronization processing procedure is completed, the present embodiment may further perform soft bit mapping processing and multi-antenna combining processing based on the third symbol sequence corresponding to each antenna, so as to obtain target soft bit sequences corresponding to multiple antennas.
For example, assume that the third symbol sequence corresponding to the ith antenna is di(n), the soft bit sequence obtained after the soft bit mapping processing is:
bi(2n-1)＝di(n)
of course, this is only an example and is not a sole limitation to the present invention, and actually, the soft bit mapping processing method in this embodiment may refer to a corresponding method in the prior art, which is not described again.
When the multi-antenna combining processing is performed, noise estimation may be performed according to the obtained soft bit sequence corresponding to each antenna, and then multi-antenna combining may be performed based on the noise estimation value corresponding to each antenna to obtain a target soft bit sequence.
Optionally, when performing noise estimation according to the soft bit sequence, the soft bit sequence may be determined first, and then the noise sequence is obtained by subtracting the soft bit sequence obtained after the determination from the soft bit sequence, and then noise estimation is performed according to the noise sequence. In addition, the even number of the soft bit sequence only has two values of-1 and 1, and the soft bit sequence with the even number can be adopted to simplify noise estimation.
Optionally, the noise estimation is performed by using the method, and noise can be corrected according to a noise estimation result when the noise estimation is small under the condition of low signal-to-noise ratio. After the noise estimation value of each antenna is obtained, the soft bit sequences of multiple antennas can be combined to obtain a target soft bit sequence:
it should be noted that, in this embodiment, the execution sequence between the soft bit mapping process and the multi-antenna combining process may be any sequence, and is not limited in this embodiment.
Optionally, after obtaining the target soft bit sequence, the embodiment further performs a hard decision process on the target soft bit sequence to obtain a hard-decision bit sequence. Of course, if bit decoding is adopted, the obtained target soft bit sequence can be directly input into the soft bit decoder for use, and the process of hard decision is omitted.
In this embodiment, a first symbol sequence of a received signal corresponding to each of multiple antennas is obtained, noise estimation processing is performed on each antenna based on the first symbol sequence corresponding to each antenna, a noise estimation value corresponding to each antenna is obtained, maximum combining processing is performed on the first symbol sequences of the multiple antennas based on the early-syndrome estimation value corresponding to each antenna, a second symbol sequence after the multiple antennas are combined is obtained, first synchronous timing detection processing is performed on the second symbol sequence, a first synchronous position is determined, interpolation timing compensation processing and extraction processing are performed on the first symbol sequence corresponding to each antenna based on the first synchronous position, and a third symbol sequence corresponding to each antenna is obtained, so that signal receiving and synchronization processing based on multiple antennas are achieved, and communication quality is improved.
Fig. 7 is a schematic structural diagram of a receiving device according to an embodiment of the present invention, and as shown in fig. 7, the receiving device includes:
an obtaining module 11, configured to obtain a first symbol sequence of a received signal corresponding to each antenna in a plurality of antennas;
a first processing module 12, configured to perform noise estimation processing on each antenna based on a first symbol sequence corresponding to each antenna, so as to obtain a noise estimation value corresponding to each antenna;
a second processing module 13, configured to perform maximum ratio combining processing on the first symbol sequences of the multiple antennas based on the noise estimation value corresponding to each antenna, so as to obtain a second symbol sequence after the multiple antennas are combined;
a third processing module 14, configured to perform a first synchronous timing detection process on the second symbol sequence, and determine a first synchronous position;
a fourth processing module 15, configured to perform interpolation timing compensation processing and decimation processing on the first symbol sequence corresponding to each antenna respectively based on the first synchronization position, so as to obtain a third symbol sequence corresponding to each antenna.
Optionally, the obtaining module 11 is specifically configured to:
acquiring receiving signals of a plurality of antennas;
and respectively carrying out demodulation processing and shaping filtering processing on the received signals of each antenna to obtain a first symbol sequence corresponding to each antenna.
Optionally, the receiving device further includes:
and the fifth processing module is configured to perform soft bit mapping processing and multi-antenna combining processing based on the third symbol sequence corresponding to each antenna, so as to obtain target soft bit sequences corresponding to the multiple antennas.
Optionally, the receiving device further includes:
and the hard decision module is used for carrying out hard decision processing on the target soft bit sequence.
The receiving device provided in this embodiment can be used to execute the method in the embodiment of fig. 2, and the execution manner and the beneficial effects are similar, and are not described again here.
Fig. 8 is a schematic structural diagram of the first processing module 12 according to an embodiment of the present invention, and as shown in fig. 8, based on the embodiment of fig. 7, the first processing module 12 includes:
a synchronous timing detection submodule 121, a first processing submodule 122, a second processing submodule 123 and an operation submodule 124;
wherein, for each antenna,
the synchronization timing detection submodule 121 is configured to perform second synchronization timing detection processing on the first symbol sequence of the antenna, and determine a second synchronization position;
the first processing sub-module 122 is configured to perform interpolation timing compensation processing and decimation processing on the first symbol sequence based on the second synchronization position to obtain a fourth symbol sequence;
the second processing submodule 123 is configured to perform DC removal processing on the fourth symbol sequence to obtain a fifth symbol sequence;
the operation submodule 124 is configured to perform a difference operation on the fourth symbol sequence and the fifth symbol sequence to obtain a noise estimation value of the antenna.
Optionally, the synchronous timing detection sub-module 121 is specifically configured to:
for each antenna, performing correlation matching processing on a first symbol sequence of the antenna and a preset first synchronization sequence to obtain a position for obtaining a maximum correlation value;
based on the position, a second synchronization position of the first symbol sequence of the antenna is determined.
Optionally, the second processing sub-module 123 is specifically configured to:
carrying out averaging operation on the fourth symbol sequence to obtain a corresponding DC frequency offset estimation value;
and performing difference processing on the fourth symbol sequence and the DC frequency offset estimation value to obtain a fifth symbol sequence.
The receiving device provided in this embodiment can be used to execute the method in the embodiment of fig. 3, and the execution manner and the beneficial effects are similar, and are not described again here.
Finally, it should be noted that, as one of ordinary skill in the art will appreciate, all or part of the processes of the methods of the embodiments described above may be implemented by hardware related to instructions of a computer program, where the computer program may be stored in a computer-readable storage medium, and when executed, the computer program may include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), a Random Access Memory (RAM), or the like.
Each functional unit in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer readable storage medium. The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (12)
1. A synchronization and reception method for a multi-antenna system, the method comprising:
acquiring a first symbol sequence of a received signal corresponding to each antenna in a plurality of antennas;
based on the first symbol sequence corresponding to each antenna, noise estimation processing is carried out on each antenna, and a noise estimation value corresponding to each antenna is obtained;
performing maximum ratio combining processing on the first symbol sequences of the multiple antennas based on the noise estimation value corresponding to each antenna to obtain a second symbol sequence after the multiple antennas are combined;
carrying out first synchronous timing detection processing on the second symbol sequence to determine a first synchronous position;
based on the first synchronous position, performing interpolation timing compensation processing and extraction processing on the first symbol sequence corresponding to each antenna respectively to obtain a third symbol sequence corresponding to each antenna;
the obtaining a first symbol sequence of a received signal corresponding to each antenna in a plurality of antennas includes:
acquiring receiving signals of a plurality of antennas;
and respectively carrying out demodulation processing and shaping filtering processing on the received signals of each antenna to obtain a first symbol sequence corresponding to each antenna.
2. The method of claim 1, wherein performing noise estimation processing on each antenna based on the first symbol sequence corresponding to each antenna to obtain a noise estimation value corresponding to each antenna comprises:
for each antenna, performing second synchronous timing detection processing on the first symbol sequence of the antenna to determine a second synchronous position;
performing interpolation timing compensation processing and extraction processing on the first symbol sequence based on the second synchronous position to obtain a fourth symbol sequence;
performing Direct Current (DC) removal processing on the fourth symbol sequence to obtain a fifth symbol sequence;
and carrying out difference operation on the fourth symbol sequence and the fifth symbol sequence to obtain a noise estimation value of the antenna.
3. The method of claim 2, wherein performing a second synchronization timing detection process on the first symbol sequence of the antenna for each antenna to determine a second synchronization position comprises:
for each antenna, performing correlation matching processing on a first symbol sequence of the antenna and a preset first synchronization sequence to obtain a position for obtaining a maximum correlation value;
based on the position, a second synchronization position of the first symbol sequence of the antenna is determined.
4. The method of claim 2, wherein the DC-removing the fourth symbol sequence to obtain a fifth symbol sequence comprises:
carrying out averaging operation on the fourth symbol sequence to obtain a corresponding DC frequency offset estimation value;
and performing difference processing on the fourth symbol sequence and the DC frequency offset estimation value to obtain a fifth symbol sequence.
5. The method according to any one of claims 1 to 4, wherein after the interpolation timing compensation process and the decimation process are respectively performed on the first symbol sequence corresponding to each antenna based on the first synchronization position to obtain the third symbol sequence corresponding to each antenna, the method further comprises:
and performing soft bit mapping processing and multi-antenna combination processing based on the third symbol sequence corresponding to each antenna to obtain target soft bit sequences corresponding to the multiple antennas.
6. The method of claim 5, wherein after performing the soft bit mapping process and the multi-antenna combining process based on the third symbol sequence corresponding to each antenna to obtain the target soft bit sequences corresponding to the multiple antennas, the method further comprises:
and carrying out hard decision processing on the target soft bit sequence.
7. A receiving device, comprising:
an obtaining module, configured to obtain a first symbol sequence of a received signal corresponding to each antenna in a plurality of antennas;
the first processing module is used for carrying out noise estimation processing on each antenna based on the first symbol sequence corresponding to each antenna to obtain a noise estimation value corresponding to each antenna;
a second processing module, configured to perform maximum ratio combining processing on the first symbol sequences of the multiple antennas based on the noise estimation value corresponding to each antenna, so as to obtain a second symbol sequence after the multiple antennas are combined;
a third processing module, configured to perform first synchronous timing detection processing on the second symbol sequence, and determine a first synchronous position;
a fourth processing module, configured to perform interpolation timing compensation processing and decimation processing on the first symbol sequence corresponding to each antenna based on the first synchronization position, respectively, to obtain a third symbol sequence corresponding to each antenna;
the acquisition module is specifically configured to:
acquiring receiving signals of a plurality of antennas;
and respectively carrying out demodulation processing and shaping filtering processing on the received signals of each antenna to obtain a first symbol sequence corresponding to each antenna.
8. The receiving device of claim 7, wherein the first processing module comprises: the synchronous timing detection module comprises a synchronous timing detection submodule, a first processing submodule, a second processing submodule and an operation submodule;
wherein, for each antenna,
the synchronous timing detection submodule is used for carrying out second synchronous timing detection processing on the first symbol sequence of the antenna and determining a second synchronous position;
the first processing submodule is configured to perform interpolation timing compensation processing and decimation processing on the first symbol sequence based on the second synchronization position to obtain a fourth symbol sequence;
the second processing submodule is used for performing DC removal processing on the fourth symbol sequence to obtain a fifth symbol sequence;
and the operation sub-module is used for carrying out difference operation on the fourth symbol sequence and the fifth symbol sequence to obtain a noise estimation value of the antenna.
9. The receiving device according to claim 8, wherein the synchronization timing detection sub-module is specifically configured to:
for each antenna, performing correlation matching processing on a first symbol sequence of the antenna and a preset first synchronization sequence to obtain a position for obtaining a maximum correlation value;
based on the position, a second synchronization position of the first symbol sequence of the antenna is determined.
10. The receiving device according to claim 8, wherein the second processing sub-module is specifically configured to:
carrying out averaging operation on the fourth symbol sequence to obtain a corresponding DC frequency offset estimation value;
and performing difference processing on the fourth symbol sequence and the DC frequency offset estimation value to obtain a fifth symbol sequence.
11. The receiving device according to any one of claims 7 to 10, wherein the receiving device further comprises:
and the fifth processing module is configured to perform soft bit mapping processing and multi-antenna combining processing based on the third symbol sequence corresponding to each antenna, so as to obtain target soft bit sequences corresponding to the multiple antennas.
12. The receiving apparatus according to claim 11, wherein the receiving apparatus further comprises:
and the hard decision module is used for carrying out hard decision processing on the target soft bit sequence.
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