CN112910532B - Multi-antenna receiving system and method for PCMFM - Google Patents
Multi-antenna receiving system and method for PCMFM Download PDFInfo
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- CN112910532B CN112910532B CN202110040018.4A CN202110040018A CN112910532B CN 112910532 B CN112910532 B CN 112910532B CN 202110040018 A CN202110040018 A CN 202110040018A CN 112910532 B CN112910532 B CN 112910532B
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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
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
- H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to a PCMFM multi-antenna receiving system and a method. Wherein, be used for PCMFM multiaerial receiving system including: the antenna comprises a PCMFM modulation module, an antenna module, a first PCMFM demodulation module, a multi-antenna combination module, a second PCMFM demodulation module and an output module. The multi-antenna receiving system for the PCMFM, provided by the invention, can combine the multiple paths of first PCMFM demodulation signals by adopting the multi-antenna combining module to generate a combined signal, and then demodulate the combined signal to obtain original data, so that the data receiving performance is improved and the accuracy of data demodulation is improved.
Description
Technical Field
The present invention relates to the field of PCMFM modulation and demodulation, and more particularly, to a PCMFM multi-antenna receiving system and method.
Background
PCMFM modulation (PCM is called pulse-code modulation, FM is called frequency modulation, and PCMFM is a cascade of two modulation schemes) is a widely used modulation technique, and a conventional receiver thereof receives by using a single directional antenna. When the transmitter moves rapidly, the receiver cannot guarantee stable reception performance. Therefore, a multi-antenna receiving mode is adopted, a larger space range is covered, and the quality of received signals is improved. There are many combining methods for multi-antenna reception, such as selective combining, maximum ratio combining, equal gain combining, and switching combining, but these algorithms are not suitable for multi-antenna combining of the PCMFM modulation method and cannot effectively improve the performance of the receiver.
Disclosure of Invention
In view of the above problems in the prior art, the present invention provides a system and method for PCMFM multiple antenna reception.
In order to achieve the purpose, the invention provides the following scheme:
a multiple antenna reception system for pcmmfm, comprising:
the PCMFM modulation module is used for generating a PCMFM modulation signal according to original data;
an antenna module for receiving the PCMFM modulated signal generated by the PCMFM modulation module;
the first PCMFM demodulation module is connected with the antenna module and used for generating a first PCMFM demodulation signal according to the PCMFM modulation signal;
a multi-antenna combining module coupled to the first PCMFM demodulation module to determine a combined signal from the first PCMFM demodulated signal;
the second PCMFM demodulation module is connected with the multi-antenna combination module and is used for generating a second PCMFM demodulation signal according to the combination signal;
and the output module is connected with the second PCMFM demodulation module and used for generating original data according to the second PCMFM demodulation signal and outputting the original data.
Preferably, the PCMFM modulation module includes:
a PCM modulation unit for generating a PCM modulation signal from the original data;
and the FM modulation unit is connected with the PCM modulation unit and used for generating the PCMFM modulation signal according to the PCM modulation signal.
Preferably, the antenna module comprises
A plurality of receive antennas coupled to the first PCMFM demodulation module.
Preferably, the first PCMFM demodulation module includes:
the PCMFM demodulation units are connected with the receiving antennas in a one-to-one correspondence mode and used for generating first PCMFM demodulation signals according to the PCMFM modulation signals.
Preferably, each of the PCMFM demodulation units includes:
the FM demodulation subunit is connected with the receiving antenna and used for generating an FM demodulation signal according to the PCMFM modulation signal;
and the PCM demodulation sub-unit is connected with the FM demodulation sub-unit and used for generating a first PCMFM demodulation signal according to the FM demodulation signal.
Preferably, the FM demodulation subunit is a frequency discriminator.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the multi-antenna receiving system for the PCMFM, provided by the invention, can combine the multiple paths of first PCMFM demodulation signals by adopting the multi-antenna combining module to generate a combined signal, and then demodulate the combined signal to obtain original data, so that the data receiving performance is improved and the accuracy of data demodulation is improved.
The invention also provides a multi-antenna receiving method for the PCMFM, corresponding to the multi-antenna receiving system for the PCMFM provided above.
The receiving method comprises the following steps:
acquiring original data;
modulating the original data to generate a PCMFM modulation signal;
demodulating the PCMFM modulated signal to generate a first PCMFM demodulated signal;
determining a combined signal from the first PCMFM demodulated signal;
demodulating the combined signal to generate a second PCMFM demodulated signal;
demodulated data is obtained by demodulating the second PCMFM demodulated signal, and the demodulated data is output.
Preferably, the determining a combined signal according to the first PCMFM demodulated signal specifically includes:
using a formula based on the first PCMFM demodulated signal
Determining the combined signal ssk(n)；
In the formula (I), the compound is shown in the specification,
mean square error of k path signal noise at n time, sk(N) is the first PCMFM demodulated signal at time N, where k is 1, 2, …, N.
Since the technical effect achieved by the multiple antenna receiving method for the pcmmfm provided by the present invention is the same as the technical effect achieved by the multiple antenna receiving system for the pcmmfm provided by the present invention, further description is omitted here.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments 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 it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a PCMFM multi-antenna receiving system according to the present invention;
fig. 2 is a schematic diagram of a pcmmfm modulation scheme according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a PCMFM demodulation scheme according to an embodiment of the present invention;
FIG. 4 is a comparison chart of data demodulation results provided by the embodiment of the invention;
fig. 5 is a flowchart of a multiple antenna receiving method for pcmmfm according to 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 invention aims to provide a PCMFM multi-antenna receiving system and a method thereof, which can obviously improve the performance of a receiver.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic structural diagram of a pcmmfm multi-antenna receiving system according to the present invention, and as shown in fig. 1, the pcmmfm multi-antenna receiving system includes: the antenna comprises a PCMFM modulation module 1, an antenna module 2, a first PCMFM demodulation module 3, a multi-antenna combination module 4, a second PCMFM demodulation module 5 and an output module 6.
The PCMFM modulation module 1 is configured to generate a PCMFM modulation signal according to original data.
The antenna module 2 is used for receiving the PCMFM modulated signal generated by the PCMFM modulation module 1.
The first PCMFM demodulation module 3 is connected to the antenna module 2, and is configured to generate a first PCMFM demodulated signal according to the PCMFM modulated signal.
The multi-antenna combining module 4 is connected to the first PCMFM demodulation module 3 for determining a combined signal from the first PCMFM demodulated signal.
The second PCMFM demodulation module 5 is connected to the multi-antenna combining module 4, and is configured to generate a second PCMFM demodulation signal according to the combined signal. Wherein the second PCMFM demodulation module 5 is preferably a PCM demodulation module.
The output module 6 is connected to the second PCMFM demodulation module 5, and is configured to generate raw data according to the second PCMFM demodulation signal, and output the raw data.
Based on the modulation principle as shown in fig. 2, the above-mentioned PCMFM modulation module 1 preferably includes: a PCM modulation unit 11 and an FM modulation unit 12.
The PCM modulation unit 11 is configured to generate a PCM modulation signal according to original data.
The FM modulation unit 12 is connected to the PCM modulation unit 11 for generating a PCMFM modulated signal from the PCM modulated signal.
In the present invention, the PCM encoding by the PCM modulation unit 11 is to sample, quantize, and encode an input analog signal, and represent the amplitude of the analog signal by a binary-encoded number. The FM modulation performed by the FM modulation unit 12 is a frequency modulation of the public standard, i.e. using the formula
And performing signal modulation. In the formula, ω0Is the carrier angular frequency,
Is the carrier phase, KpPhase modulation index, f (t) is a modulation signal.
Therefore, the PCMFM modulation module 1 provided by the present invention adopts the structure of the existing PCMFM modulation module, and the details of the present invention are not repeated herein.
In order to further improve the receiving performance, the antenna module 2 provided in the above embodiment of the present invention preferably includes a plurality of receiving antennas 21. The multiple receiving antennas 21 are all connected to the first PCMFM demodulation module 3.
Further, based on the demodulation principle shown in fig. 3, the first PCMFM demodulation module 3 preferably includes: a plurality of PCMFM demodulation units 31.
The PCMFM demodulation units 31 are connected to the receiving antennas 21 in a one-to-one correspondence, and are configured to generate a first PCMFM demodulated signal according to the PCMFM modulated signal. The invention adopts the PCMFM demodulation units with the same number as that of the receiving antennas, and aims to improve the accuracy of signal modulation and demodulation while avoiding the problem that the signal cannot be modulated and demodulated due to the damage of a certain receiving channel so as to avoid the influence on the demodulation due to the precision difference among components.
Specifically, as shown in fig. 3, each of the PCMFM demodulation units 31 in the present invention includes: an FM demodulation subunit 311 and an FM demodulation subunit 311.
The FM demodulation subunit 311 is connected to the receiving antenna 21, and is configured to generate an FM demodulation signal according to the PCMFM modulation signal. The FM demodulation sub-unit provided in the present invention is preferably a frequency discriminator (the discriminator is a disclosed calculation method), and f (t) is directly obtained by using the discriminator.
The PCM demodulation sub-unit 312 is connected to the FM demodulation sub-unit 311, and generates a first PCMFM demodulated signal from the FM demodulated signal.
The PCM demodulation sub-unit 312 performs a PCM decoding operation of inverse-quantizing the FM-demodulated discrete values into analog signals.
Among them, the PCMFM signal shown in fig. 2 and 3 corresponds to the first PCMFM signal provided by the present invention.
The FM modulation, FM demodulation, PCM modulation and PCM demodulation provided by the invention have a plurality of different processing modes, including public modulation and demodulation algorithms and private modulation and demodulation algorithms. The receiving system provided by the invention can use a public algorithm or an undisclosed algorithm, and the performance of the multi-antenna receiving system is not influenced. When the undisclosed algorithm is used, the corresponding modulation and demodulation algorithm is only needed to be implanted into the modulation and demodulation unit, and the overall architecture of the receiving system is not changed.
The specific working principle of the PCMFM multi-antenna receiving system provided by the invention is as follows:
original data b (0) is subjected to PCMFM modulation through a PCMFM modulation module 1 (transmitter), so that a first PCMFM modulation signal is obtained, and the first PCMFM modulation signal is sent to a plurality of receiving antennas. Specifically, the transmitter performs PCMFM modulation on the original data b (N) to obtain a first PCMFM modulated signal, transmits the first PCMFM modulated signal, and then reaches the multiple receiving antennas 1, 2, …, and N after spatial propagation. In the present invention, the PCMFM modulation is a standard modulation method disclosed herein.
After receiving the signal by the receiving antenna, the received signal r at the time n is obtainedk(N), k is 1, 2, …, N. And N is the number of receiving antennas.
Received signal rk(N) sending the signals to the N FM demodulation subunits 311 for demodulation, and obtaining FM modulation signals by using a frequency/phase discrimination method, i.e. obtaining PCM signals s recovered at N timesk(N), k is 1, 2, …, N. The demodulation method may be a disclosed FM demodulation algorithm or an undisclosed new algorithm.
PCM signal s to be restoredk(N) sending the signal to N PCM demodulation subunits 312 for demodulation, and obtaining the signal before PCM modulation by adopting a mode of window accumulation judgment after bit synchronization, namely obtaining the demodulation output b at N momentsk(N), k is 1, 2, …, N. When a single receiving antenna is used, bkAnd (n) is the demodulation output of the receiver corresponding to the receiving antenna k. At the same timeUsing demodulated output bk(n) repeating the PCM modulation to obtain a PCM demodulated signal
k is 1, 2, …, N. The demodulation method may be a public PCM demodulation algorithm or a new algorithm that is not disclosed.
The multi-receiving antenna combining module 4 combines the PCM signal sk(n) and PCM demodulated signal
The calculation is carried out according to the following formula to obtain a combined signal ss at the n moment after combinationk(n)
Wherein M is the statistical length of noise, and the larger M is, the noise
The higher the statistical accuracy of (c), but the slower the speed of tracking noise changes.
The combined signal ss is combinedk(n) sending the data into a second PCMFM demodulation module 5 to obtain original data b before modulation0(n)。b0And (n) is the demodulation output of the receiver after multi-antenna combination.
As shown in fig. 4, dual receive antenna combining provides a 3dB performance improvement over single receive antenna reception. The combination of the four receiving antennas has 6dB performance improvement compared with the single receiving antenna. In fig. 4, the abscissa is the snr and the ordinate is the ber, a solid black line represents the ber curve received by a single antenna, a profile bar represents the ber curve received by diversity combining of dual antennas, and an o-profile bar represents the ber curve received by diversity combining of four antennas.
When multiple receiving antennas are used, the effect of a single receiving antenna can be achieved as long as 1 receiving antenna normally receives, and the characteristic greatly improves the robustness of the system no matter whether other receiving antennas normally work or not.
When a plurality of receiving antennas receive normally, the sensitivity of the system is far higher than that of a single receiving antenna, and the overall performance of the system is greatly improved by the characteristic.
In addition, corresponding to the above-mentioned multiple antenna receiving system for pcmmfm, the present invention also provides a multiple antenna receiving method for pcmmfm, as shown in fig. 5, the receiving method comprising:
step 100: raw data is acquired.
Step 101: and modulating the original data to generate a PCMFM modulation signal.
Step 102: the PCMFM modulated signal is demodulated to generate a first PCMFM demodulated signal.
Step 103: a combined signal is determined from the first PCMFM demodulated signal.
Step 104: the combined signal is demodulated to produce a second PCMFM demodulated signal.
Step 105: demodulated data is obtained by demodulating the second PCMFM demodulated signal, and the demodulated data is output.
Preferably, in step 103, a formula is used, in particular based on the first PCMFM demodulated signal
Determining the combined signal ssk(n)。
In the formula (I), the compound is shown in the specification,
mean square error of k path signal noise at n time, sk(N) is the first PCMFM demodulated signal at time N, where k is 1, 2, …, N.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The method disclosed by the embodiment corresponds to the system disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the system part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (3)
1. A multiple antenna reception system for pcmmfm, comprising:
the PCMFM modulation module is used for generating a PCMFM modulation signal according to original data;
an antenna module for receiving the PCMFM modulated signal generated by the PCMFM modulation module;
the first PCMFM demodulation module is connected with the antenna module and used for generating a first PCMFM demodulation signal according to the PCMFM modulation signal;
a multi-antenna combining module, coupled to the first pcmmfm demodulation module, for determining a combined signal from the first pcmmfm demodulated signal;
the second PCMFM demodulation module is connected with the multi-antenna combination module and is used for generating a second PCMFM demodulation signal according to the combination signal;
an output module, connected to the second PCMFM demodulation module, for generating original data according to the second PCMFM demodulation signal and outputting the original data;
the antenna module comprises
A plurality of receiving antennas connected with the first PCMFM demodulation module;
the first PCMFM demodulation module includes:
the PCMFM demodulation units are connected with the receiving antennas in a one-to-one correspondence mode and used for generating a first PCMFM demodulation signal according to the PCMFM modulation signal;
each of the PCMFM demodulation units includes:
the FM demodulation subunit is connected with the receiving antenna and used for generating an FM demodulation signal according to the PCMFM modulation signal;
the PCM demodulation sub-unit is connected with the FM demodulation sub-unit and used for generating a first PCMFM demodulation signal according to the FM demodulation signal;
wherein the signal is received
Sending the signals into N FM demodulation subunits for demodulation, and acquiring FM modulation signals by adopting a frequency discrimination/phase discrimination mode to obtain PCM signals recovered at N moments
，k=1、2、…、N；
PCM signal to be restored
Sending the signal into N PCM demodulation subunits for demodulation, and obtaining the signal before PCM modulation by adopting a mode of window accumulation judgment after bit synchronization, namely obtaining the demodulation output at N moments
K =1, 2, …, N; when the antenna is used for receiving signals from a single antenna,
namely the demodulation output of the receiver corresponding to the receiving antenna k; using demodulated output simultaneously
Performing PCM modulation again to obtain PCM demodulation signal
，k=1、2、…、N；
Multi-antenna combining module for combining PCM signals
And PCM demodulated signal
Calculating according to the following formula to obtain a combined signal at n time after combination
Wherein M is the statistical length of the noise,
the mean square error of the kth path of signal noise at the moment n;
combining the combined signals
Sending into a second PCMFM demodulation module to obtain the original data before modulation
。
2. The system of claim 1, for the pcmmfm multi-antenna reception, wherein the pcmmfm modulation module comprises:
a PCM modulation unit for generating a PCM modulation signal according to the original data;
and the FM modulation unit is connected with the PCM modulation unit and used for generating the PCMFM modulation signal according to the PCM modulation signal.
3. The system of claim 1, wherein the FM demodulation sub-unit is a frequency discriminator.
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