CN110752898B - Processing method and device based on multi-antenna received signals - Google Patents
Processing method and device based on multi-antenna received signals Download PDFInfo
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- CN110752898B CN110752898B CN201910933764.9A CN201910933764A CN110752898B CN 110752898 B CN110752898 B CN 110752898B CN 201910933764 A CN201910933764 A CN 201910933764A CN 110752898 B CN110752898 B CN 110752898B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
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- H—ELECTRICITY
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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Abstract
The invention discloses a processing method and a processing device based on multi-antenna received signals, and belongs to the technical field of diversity reception. The method comprises the following steps: determining an amplitude value of the baseband signal; the baseband signal is converted from a radio frequency signal received by an antenna, and the antenna is any one of at least two pairs of antennas adopted by space diversity; determining the attenuation of an amplifying circuit corresponding to the antenna according to the amplitude value of the baseband signal; the amplifying circuit corresponding to the antenna is used for amplifying the radio frequency signal received by the antenna before the radio frequency signal is converted into a baseband signal; generating at least two sets of control data according to the attenuation amount; each group of control data comprises an antenna mark, a serial number and a partial digital string of the attenuation, at least two groups of partial digital strings of the attenuation in the control data are arranged according to the sequence of the serial numbers in each group of control data, and the numerical value represented by the complete digital string is equal to the attenuation; and at least two groups of control data are transmitted through the control lines in sequence. The invention can improve the communication quality.
Description
Technical Field
The present invention relates to the field of diversity reception technologies, and in particular, to a method and an apparatus for processing a received signal based on multiple antennas.
Background
In a wireless communication system, a wireless signal is transmitted from a transmitter to a receiver, and different objects are encountered to generate different reflections, refractions and scatterings, so that the signal received by the receiver is a composite of a direct wave and a plurality of reflected waves, and the time delays of the signals transmitted at the same time to the receiver through different paths are different, and the signals transmitted at different times may be received by the receiver at the same time to generate intersymbol interference, which affects the communication quality. Meanwhile, in the synthesized signal, the in-phase signal is added, and the anti-phase signal is offset. Since the propagation medium and the propagation path vary with time, the signal strength received by the receiver varies in amplitude, i.e., fading, which also affects the communication quality when fading is large.
Diversity techniques are a major anti-fading technique. Space diversity (english) is also called antenna diversity, and is one of the most used diversity forms in wireless communication. Space diversity mainly uses at least two pairs of antennas to receive signals, and then combines the signals received by each pair of antennas. The distance between two adjacent pairs of antennas is more than half wavelength, so that the performance of receiving signals by the antennas is different and uncorrelated. When the signals received by a certain antenna are greatly faded, other antennas basically cannot simultaneously greatly fade, and the signals with large intensity amplitude and optimal signal-to-noise ratio can be selected from the signals received by each antenna, so that the fading effect is effectively avoided, the intersymbol interference is eliminated, and the wireless communication quality is ensured.
The signal strength received by each antenna has amplitude variation, and Automatic Gain Control (AGC) is required to be performed on the received signal first. AGC is to automatically adjust the gain of an amplifier circuit according to signal strength, and to keep the output voltage constant or substantially constant when the input signal voltage changes greatly. Specifically, when the strength of the input signal is low, AGC does not work, and the amplification circuit adopts a large gain; when the strength of the input signal is high, the AGC plays a control role, and the gain of the amplifying circuit is reduced along with the increase of the input signal, so that the strength of the signal received by each pair of antennas is controlled within a certain amplitude range, and the demodulation and recovery of the signal are facilitated.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:
at least two pairs of antennas used for space diversity have different received signal strength, and the signals received by the antennas need to be processed by mutually independent AGC circuits. However, due to the limitation of hardware conditions, the control line provided in the receiver is only enough for the AGC circuit of one antenna. If only one antenna adopts the AGC circuit, the demodulation of signals received by other antennas may have problems, and the wireless communication quality is influenced; if only one antenna is used to receive signals, the signals may be affected by fading, intersymbol interference and the like, resulting in poor wireless communication quality.
Disclosure of Invention
The embodiment of the invention provides a processing method and a device based on multi-antenna received signals, which can enable AGC circuits of all pairs of antennas to share the same control line, not only adopts at least two pairs of antennas to receive signals to avoid fading effect and intersymbol interference, but also can adopt the AGC circuits to process all pairs of antennas, is favorable for demodulating and recovering signals and ensures the wireless communication quality. The technical scheme is as follows:
in one aspect, an embodiment of the present invention provides a processing method based on multiple antenna received signals, where the processing method includes:
determining an amplitude value of the baseband signal; the baseband signal is converted from a radio frequency signal received by an antenna, and the antenna is any one of at least two pairs of antennas adopted by space diversity;
determining the attenuation of an amplifying circuit corresponding to the antenna according to the amplitude value of the baseband signal; the amplifying circuit corresponding to the antenna is used for amplifying a radio-frequency signal received by the antenna before the radio-frequency signal is converted into the baseband signal, and the attenuation of the amplifying circuit is used for adjusting the gain of the amplifying circuit;
generating at least two sets of control data according to the attenuation amount; each group of control data comprises an antenna mark, a serial number and a partial digital string of the attenuation, the partial digital strings of the attenuation in the at least two groups of control data are arranged according to the sequence of the serial numbers in the control data, and the numerical value represented by the complete digital string is equal to the attenuation;
And transmitting the at least two groups of control data through a control line in sequence, wherein the control line is connected with the amplifying circuits corresponding to all antennas adopted by the space diversity, and the amplifying circuits corresponding to the antennas receive the at least two groups of control data to obtain the attenuation and adjust the gain according to the attenuation.
Alternatively,
the transmitting the at least two groups of control data through the control lines in turn comprises:
and control data generated by the attenuation of the amplifying circuits corresponding to all the antennas adopted by the space diversity are transmitted sequentially through the control line.
Further, the determining the amplitude value of the baseband signal includes:
sampling the baseband signal once every set time to obtain an amplitude value of the baseband signal during each sampling;
and taking the average value of the amplitude values of the baseband signal during multiple times of sampling as the amplitude value of the baseband signal.
Optionally, the determining an attenuation amount of an amplifying circuit corresponding to the antenna according to the amplitude value of the baseband signal includes:
acquiring an upper limit value and a lower limit value;
when the amplitude value of the baseband signal is between the upper limit value and the lower limit value, the attenuation quantity of an amplifying circuit corresponding to the antenna is kept unchanged;
When the amplitude value of the baseband signal is larger than the upper limit value, increasing the attenuation of an amplifying circuit corresponding to the antenna;
and when the amplitude value of the baseband signal is smaller than the lower limit value, reducing the attenuation of the amplifying circuit corresponding to the antenna.
Further, the obtaining the upper limit value and the lower limit value includes:
changing an amplitude value of the baseband signal;
demodulating the baseband signal with the changed amplitude value to obtain a digital signal;
and determining the upper limit value and the lower limit value according to whether the digital signal is correctly demodulated.
Optionally, the processing method further includes:
demodulating the baseband signal to obtain a digital signal;
decoding the digital signal to obtain decoded data and error correction data;
determining the error rate of the decoded data according to the error correction data;
and outputting the decoding data with the minimum error rate in the decoding data obtained by the radio frequency signals received by all the antennas adopted by the space diversity.
Further, the processing method further comprises:
code synchronizing the digital signal prior to decoding the digital signal;
when only one path of successful code synchronization exists in digital signals obtained by radio frequency signals received by all antennas adopted by space diversity, decoding data obtained by decoding the digital signals successfully synchronized by the code synchronization is output;
And when at least two paths of successful codes are synchronized in the digital signals obtained by the radio frequency signals received by all the antennas adopted by the space diversity, decoding data with the minimum error rate in the decoded data obtained by decoding the digital signals with the successful codes.
Optionally, the processing method further includes:
receiving a radio frequency signal through the antenna;
amplifying the radio frequency signal by adopting a radio frequency amplifying circuit, wherein the radio frequency amplifying circuit is an amplifying circuit corresponding to the antenna;
performing frequency conversion on the amplified radio frequency signal to obtain an intermediate frequency signal;
amplifying the intermediate-frequency signal by adopting an intermediate-frequency amplifying circuit, wherein the intermediate-frequency amplifying circuit is an amplifying circuit corresponding to the antenna;
and performing frequency conversion on the amplified intermediate frequency signal to obtain the baseband signal.
Optionally, the number of antennas used for spatial diversity is two, and the two antennas are respectively arranged on two opposite surfaces of the receiver.
In another aspect, an embodiment of the present invention provides a processing apparatus based on multiple antenna received signals, where the processing apparatus includes:
the amplitude value determining module is used for determining an amplitude value of the baseband signal; the baseband signal is converted from a radio frequency signal received by an antenna, and the antenna is any one of at least two pairs of antennas adopted by space diversity;
The attenuation amount determining module is used for determining the attenuation amount of an amplifying circuit corresponding to the antenna according to the amplitude value of the baseband signal; the amplifying circuit corresponding to the antenna is used for amplifying a radio-frequency signal received by the antenna before the radio-frequency signal is converted into the baseband signal, and the attenuation of the amplifying circuit is used for adjusting the gain of the amplifying circuit;
the data generation module is used for generating at least two groups of control data according to the attenuation amount; each group of control data comprises an antenna mark, a serial number and a partial digital string of the attenuation, the partial digital strings of the attenuation in the at least two groups of control data are arranged according to the sequence of the serial numbers in the control data, and the numerical value represented by the complete digital string is equal to the attenuation;
and the data transmission module is used for transmitting the at least two groups of control data through the control lines in sequence, the control lines are connected with the amplifying circuits corresponding to all the antennas adopted by the space diversity, and the amplifying circuits corresponding to the antennas receive the at least two groups of control data to obtain the attenuation and adjust the gain according to the attenuation.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
The amplitude value of the baseband signal is determined, the attenuation of the amplifying circuit is determined according to the amplitude value of the baseband signal, at least two groups of control data are generated according to the attenuation, and the at least two groups of control data are transmitted through the control lines in sequence. Since the control line is connected to the amplification circuits corresponding to all antennas used for the spatial diversity, at least two sets of control data determined based on the antenna reception signal can be transmitted to the amplification circuits corresponding to the antennas. And each group of control data comprises an antenna mark, a serial number and a partial digital string of the attenuation, so that after the amplifying circuits corresponding to all antennas adopted by the space diversity receive at least two groups of control data transmitted by the control line, whether the control data belong to the corresponding antennas can be determined according to the antenna marks, and when the antenna marks are consistent with the corresponding antennas, the partial digital strings of the attenuation are arranged according to the sequence of the serial numbers in each group of control data to form a complete digital string representing that the numerical value is equal to the attenuation, so that the gain of the corresponding amplifying circuits can be adjusted according to the attenuation. In addition, the amplifying circuits corresponding to all the antennas adopted by the space diversity are connected with the same control line, the condition that only one control line used by an AGC circuit is arranged in a receiver can be adapted, the limitation of hardware conditions is broken through, the AGC circuits are arranged for all the antennas adopted by the space diversity, and the wireless communication quality is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced 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 based on these drawings without creative efforts.
Fig. 1 is an application scenario diagram of a processing method based on multiple antenna received signals according to an embodiment of the present invention;
fig. 2 is a flowchart of a processing method based on multiple antenna received signals according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a processing apparatus based on multiple antenna received signals according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
An application scenario of a processing method based on multiple antenna received signals according to an embodiment of the present invention is described below. Fig. 1 is an application scenario diagram of a processing method based on multiple antenna received signals according to an embodiment of the present invention. Referring to fig. 1, a wireless communication system includes a transmitter 100 and a receiver 200. At least one pair of transmitting antennas is arranged on the transmitter 100, and when the number of the transmitting antennas is more than two, the distance between each pair of transmitting antennas is greater than a set value; at least two pairs of receiving antennas are provided on the receiver 200, and the distance between the receiving antennas is greater than a set value.
Illustratively, as shown in fig. 1, a transmitter 100 is provided with a transmitting antenna 110, and a receiver 200 is provided with two receiving antennas 210 and 220. The two pairs of receiving antennas 210, 220 are respectively disposed at different positions in the vertical direction: the height from the center of the receiving antenna 210 to the ground is L, the height from the center of the receiving antenna 220 to the ground is L + d, and the distance between the receiving antenna 210 and the receiving antenna 220 is d; the center of the transmitting antenna 110 is at a height L' from the ground. The two pairs of receiving antennas 210 and 220 are arranged opposite to the transmitting antenna 110 in the horizontal direction; transmitter 100 transmits wireless signals at transmit antenna 110 and receiver 200 receives wireless signals at receive antenna 210 and receive antenna 220, respectively, to achieve spatial diversity.
In practical applications, the number of antennas used for spatial diversity may be two. The two antennas can effectively avoid fading effect and intersymbol interference, the number of signals received by the antennas is small, on one hand, the number of correspondingly required devices is small, on the other hand, the complexity of signal processing is low, and on both sides, the implementation cost and the implementation difficulty can be effectively reduced.
Alternatively, the two antennas may be disposed on two surfaces opposite to the receiver, respectively. On one hand, the distance between the two antennas is larger, on the other hand, the difference of the environments of the two antennas is larger, the fading performance is difficult to be the same, and the space diversity is favorably realized.
Illustratively, the two antennas are an upper antenna and a lower antenna, respectively. The upper antenna is arranged on the skin of a tail boom above the airplane, and the right front of the upper antenna is shielded by an airplane engine to form an angle of 60 degrees, so that most of an angle area above the airplane body can be covered. The lower antenna is installed on a skin of a tail beam behind an abdomen of the airplane, the nose part in the front of the lower antenna is shielded by an angle of 90 degrees, the tail part in the front of the lower antenna is shielded by an angle of 10 degrees, and the part above the lower antenna is shielded by an angle of 140 degrees and can cover most angle areas below the airplane body. When the upper antenna and the lower antenna adopt the omnidirectional antenna, the overall coverage angle of the upper antenna and the lower antenna is very comprehensive, so that the signals received by the two antennas can be effectively prevented from being greatly faded at the same time, and the communication quality is ensured.
The embodiment of the invention provides a processing method based on multi-antenna received signals. Fig. 2 is a flowchart of a processing method based on multiple antenna received signals according to an embodiment of the present invention. Referring to fig. 2, the processing method includes:
step 101: amplitude values of the baseband signal are determined.
In this embodiment, the baseband signal is converted from a radio frequency signal received by an antenna, and the antenna is any one of at least two antennas used for space diversity.
In practical applications, the frequency of the rf signal is very high, it is difficult to directly obtain the baseband signal, and the baseband signal can be obtained as follows:
receiving a radio frequency signal through an antenna;
performing frequency conversion on the radio frequency signal to obtain an intermediate frequency signal;
and performing frequency conversion on the intermediate frequency signal to obtain a baseband signal.
The frequency conversion method is characterized in that a radio frequency signal (such as a C wave band) is converted into an intermediate frequency signal (such as an L wave band) for transition, the intermediate frequency signal is converted into a baseband signal in a frequency mode, and the frequency conversion is achieved in two stages, so that the difficulty in achieving frequency conversion is reduced, and the achieving effect of frequency conversion is guaranteed.
In addition, the space diversity adopts at least two pairs of antennas, and each pair of antennas can receive radio frequency signals, so that the radio frequency signals received by each pair of antennas are subjected to frequency conversion twice respectively to obtain baseband signals.
Optionally, before performing frequency conversion on the radio frequency signal, the radio frequency signal may be amplified by using a radio frequency amplification circuit, and then the amplified radio frequency signal is subjected to frequency conversion to obtain an intermediate frequency signal. Before the frequency conversion of the intermediate frequency signal, the intermediate frequency signal may be amplified by an intermediate frequency amplifying circuit, and then the amplified intermediate frequency signal may be subjected to frequency conversion to obtain a baseband signal. Aiming at two-stage frequency conversion, the signal is amplified before each stage of frequency conversion, which is beneficial to improving the precision of frequency conversion.
In addition, the space diversity uses two-stage frequency conversion of the radio frequency signals received by each antenna, so that the intermediate frequency amplifying circuit and the radio frequency amplifying circuit both correspond to the antenna, namely the amplifying circuit corresponding to the antenna.
In summary, before step 101, the processing method may further include:
receiving a radio frequency signal through an antenna;
amplifying the radio frequency signal by adopting a radio frequency amplifying circuit, wherein the radio frequency amplifying circuit is an amplifying circuit corresponding to the antenna;
performing frequency conversion on the amplified radio frequency signal to obtain an intermediate frequency signal;
amplifying the intermediate-frequency signal by adopting an intermediate-frequency amplifying circuit, wherein the intermediate-frequency amplifying circuit is an amplifying circuit corresponding to the antenna;
and performing frequency conversion on the amplified intermediate frequency signal to obtain a baseband signal.
Optionally, this step 101 may include:
sampling the baseband signal once every set time to obtain an amplitude value of the baseband signal during each sampling;
and taking the average value of the amplitude values of the baseband signal in the multiple sampling as the amplitude value of the baseband signal.
In practical applications, the baseband signal includes an In-phase (In-phase) signal and a Quadrature (Quadrature) signal, and the amplitude value a of the baseband signal can be calculated by using the following formula:
A＝I2+Q2；
Where I denotes an in-phase signal component and Q denotes a quadrature signal component.
The baseband signal is a continuously varying signal, the amplitude value of the baseband signal at each time is obtained by sampling, and the sampling results are different. The amplitude values of the baseband signals obtained by multiple times of sampling are averaged, so that the overall situation of the baseband signals in a period of time can be determined, and the processing effect of the baseband signals is improved.
Illustratively, the number of multiple samples may be 4, 16, 32, 64, 128, etc., such as 128.
In practical applications, the number of multiple samples may be determined by the time of the AGC. If the AGC time is longer, the number of multiple sampling is larger; if the AGC time is short, the number of multiple samples is small.
Step 102: and determining the attenuation of the amplifying circuit corresponding to the antenna according to the amplitude value of the baseband signal.
In this embodiment, the amplifying circuit corresponding to the antenna is used to amplify the radio frequency signal received by the antenna before converting the radio frequency signal into a baseband signal, and the attenuation of the amplifying circuit is used to adjust the gain of the amplifying circuit.
Optionally, this step 102 may include:
acquiring an upper limit value and a lower limit value;
when the amplitude value of the baseband signal is between the upper limit value and the lower limit value, the attenuation quantity of an amplifying circuit corresponding to the antenna is kept unchanged;
When the amplitude value of the baseband signal is larger than the upper limit value, increasing the attenuation of an amplifying circuit corresponding to the antenna;
and when the amplitude value of the baseband signal is smaller than the lower limit value, reducing the attenuation of the amplifying circuit corresponding to the antenna.
Adjusting the attenuation of the amplifying circuit according to the upper limit value and the lower limit value, and when the amplitude value of the baseband signal is between the upper limit value and the lower limit value, the signal can be correctly demodulated after being processed by the amplifying circuit, and the original gain is kept; when the amplitude value of the baseband signal is greater than the upper limit value or less than the lower limit value, the signal cannot be demodulated correctly after being processed by the amplifying circuit, and adjustment needs to be performed according to the magnitude relation between the amplitude value of the baseband signal and the upper limit and the lower limit, so that the amplitude value of the baseband signal is between the upper limit value and the lower limit value.
Further, when the amplitude value of the baseband signal is greater than the upper limit value, the attenuation X of the amplifying circuit corresponding to the antenna may be calculated by using the following formula:
X＝X0+(A-Aupper part of)*k；
Where X is the attenuation after adjustment, X0 is the attenuation before adjustment, A is the amplitude value of the baseband signalOn the upper partIs an upper limit value, and k is a set value.
For example, if k is 20dB, the amplitude value of the baseband signal is 1V greater than the upper limit value, and the attenuation amount is increased by 20 dB; if the amplitude value of the baseband signal is 3V greater than the upper limit value, the attenuation increases by 60 dB.
In practical applications, the attenuation has a table of correspondences that are converted to binary values. For example, the attenuation amount of the amplifying circuit of the intermediate frequency signal corresponds to a binary value of 4 bits. The AGC defaults to a non-attenuation state, the attenuation amount corresponding to the 4-bit binary value of all 0 is 32dB, the attenuation amount corresponding to the 4-bit binary value of all 1 is 2dB, and k is 2dB at the moment.
Accordingly, when the amplitude value of the baseband signal is smaller than the lower limit value, the attenuation X of the amplifying circuit corresponding to the antenna can be calculated by using the following formula:
X＝X0-(A-Alower part)*k；
Where X is the attenuation after adjustment, X0 is the attenuation before adjustment, A is the amplitude value of the baseband signalLower partIs a lower limit value and k is a set value.
For example, if k is 20dB, the amplitude value of the baseband signal is 1V smaller than the lower limit value, and the attenuation amount is reduced by 20 dB; if the amplitude value of the baseband signal is 3V smaller than the lower limit value, the attenuation amount is reduced by 60 dB.
The magnitude of the attenuation amount is correspondingly adjusted according to the magnitude of the phase difference between the baseband signal and the upper limit value and the lower limit value, so that the amplitude value of the baseband signal can be adjusted between the upper limit value and the lower limit value as soon as possible.
Further, acquiring the upper limit value and the lower limit value may include:
changing an amplitude value of the baseband signal;
Demodulating the baseband signal with the changed amplitude value to obtain a digital signal;
and determining the upper limit value and the lower limit value according to whether the digital signal is correctly demodulated.
The amplitude value of the baseband signal can be automatically adjusted between the upper limit and the lower limit by changing the amplitude value of the baseband signal, determining the range in which the digital signal can be correctly demodulated and correspondingly obtaining the upper limit value and the lower limit value.
In practical application, the gain of the amplifying circuit is not adjusted by default, the amplitude value of the baseband signal can be changed by external equipment, the influence of the amplitude value change of the baseband signal on the demodulation condition is obtained, the amplitude value of the baseband signal is monitored at the same time, and the upper limit value and the lower limit value are obtained based on the demodulation result.
Step 103: at least two sets of control data are generated based on the attenuation amount.
In this embodiment, each set of control data includes an antenna tag, a serial number, and a partial digital string of an attenuation amount, and at least two sets of partial digital strings of an attenuation amount in the control data are arranged according to the sequence of the serial numbers in each set of control data, and a value represented by a complete digital string of the control data is equal to the attenuation amount.
Step 104: and at least two groups of control data are transmitted through the control line in sequence, the control line is connected with the amplifying circuits corresponding to all the antennas adopted by the space diversity, and the amplifying circuits corresponding to the antennas receive the at least two groups of control data to obtain the attenuation and adjust the gain according to the attenuation.
In practical application, the binary value corresponding to the attenuation of the amplifying circuit of the intermediate frequency signal has 4 bits, and 4 discrete control lines are generally distributed for transmission; the binary value corresponding to the attenuation corresponding to the amplifying circuit of the radio frequency signal has 5 bits, and 5 discrete control lines are generally distributed for transmission. The hardware is designed with 9 off-line control lines, if only one receiving antenna is provided, the attenuation of the amplifying circuit which just transmits the intermediate frequency signal and the radio frequency signal is exactly the same. However, at least two receiving antennas are required for spatial separation, and thus the number of amplifying circuits for the intermediate frequency signal and the radio frequency signal is more than two. Therefore, 4 discrete control lines are shared by the amplifier circuits for the intermediate frequency signals of the respective sub-antennas, and 5 discrete control lines are shared by the discharge circuits for the radio frequency signals of the respective sub-antennas.
Taking two pairs of receiving antennas as an example, the 1 st bit of a group of control data transmitted on 4 discrete control lines is an antenna flag, where 0 represents an upper antenna and 1 represents a lower antenna; the 2 nd bit is a serial number, such as 0 represents two low bit data, and 1 represents two high bit data; the 3 rd bit and the 4 th bit are partial digital strings of the attenuation amount. For example, when the binary value corresponding to the attenuation amount of the amplifier circuit for the intermediate frequency signal of the upper antenna is 0110 and the binary value corresponding to the attenuation amount of the amplifier circuit for the intermediate frequency signal of the lower antenna is 1001, 0010 (the digital string 10 of the upper antenna 0 lower by two bits 0), 0101 (the digital string 01 of the upper antenna 0 higher by two bits 1), 1001 (the digital string 01 of the lower antenna 1 lower by two bits 0), 1110 (the digital string 10 of the lower antenna 1 higher by two bits 1) are transmitted in this order on the 4 discrete control lines.
The 1 st bit of a group of control data transmitted on the 5 discrete control lines is an antenna mark, for example, 0 represents an upper antenna, and 1 represents a lower antenna; the 2 nd bit is a serial number, such as 0 represents low three-bit data, and 1 represents high two-bit data; when the lower three-bit data is transmitted, the 3 rd bit, the 4 th bit and the 5 th bit are partial digital strings of the attenuation amount; when the high two-bit data is transmitted, the 3 rd bit is complemented with 0, and the 4 th bit and the 5 th bit are partial digital strings of the attenuation. For example, when the binary value corresponding to the attenuation amount of the amplifier circuit for the intermediate frequency signal of the upper antenna is 10110 and the binary value corresponding to the attenuation amount of the amplifier circuit for the intermediate frequency signal of the lower antenna is 01011, 00110 (the digital string 110 with the upper antenna 0 lower by three bits 0), 01010 (the digital string 10 with the upper antenna 0 higher by two bits 1), 10011 (the digital string 011 with the lower antenna 1 lower by three bits 0), and 11001 (the digital string 01 with the lower antenna 1 higher by two bits 1) are transmitted in this order over 5 discrete control lines.
The hold time for transmitting data on the discrete control line can be more than 100ns to ensure accurate acquisition.
Optionally, this step 104 may include:
and sequentially transmitting the adjustment data generated by the adjustment values of the amplifying circuits corresponding to all the antennas adopted by the space diversity through the control line.
Optionally, the processing method may further include:
demodulating the baseband signal to obtain a digital signal;
decoding the digital signal to obtain decoded data and error correction data;
determining the error rate of the decoded data according to the error correction data;
and outputting the decoding data with the minimum error rate in the decoding data obtained by the radio frequency signals received by all the antennas adopted by the space diversity.
And selecting better data output according to the error rate, thereby utilizing the space diversity technology to avoid the fading effect, eliminating the intersymbol interference and ensuring the wireless communication quality.
In practical application, when the bit error rate of decoded data obtained by radio frequency signals received by at least two antennas adopted by space diversity is minimum, one path of decoded data with the minimum bit error rate can be selected at will for output.
Further, the processing method may further include:
code synchronizing the digital signal before decoding the digital signal;
when only one path of successful code synchronization exists in digital signals obtained by radio frequency signals received by all antennas adopted by space diversity, decoding data obtained by decoding the digital signals successfully synchronized by the code synchronization is output;
and when at least two paths of successful codes are synchronized in the digital signals obtained by the radio frequency signals received by all the antennas adopted by the space diversity, decoding data with the minimum error rate in the decoded data obtained by decoding the digital signals with the successful codes.
According to the embodiment of the invention, the amplitude value of the baseband signal is determined, the attenuation amount of the amplifying circuit is determined according to the amplitude value of the baseband signal, at least two groups of control data are generated according to the attenuation amount, and the at least two groups of control data are transmitted sequentially through the control lines. Since the control line is connected to the amplification circuits corresponding to all antennas used for the spatial diversity, at least two sets of control data determined based on the antenna reception signal can be transmitted to the amplification circuits corresponding to the antennas. And each group of control data comprises an antenna mark, a serial number and a partial digital string of the attenuation, so that after the amplifying circuits corresponding to all antennas adopted by the space diversity receive at least two groups of control data transmitted by the control line, whether the control data belong to the corresponding antennas can be determined according to the antenna marks, and when the antenna marks are consistent with the corresponding antennas, the partial digital strings of the attenuation are arranged according to the sequence of the serial numbers in each group of control data to form a complete digital string representing that the numerical value is equal to the attenuation, so that the gain of the corresponding amplifying circuits can be adjusted according to the attenuation. In addition, the amplifying circuits corresponding to all the antennas adopted by the space diversity are connected with the same control line, the condition that only one control line used by an AGC circuit is arranged in a receiver can be adapted, the limitation of hardware conditions is broken through, the AGC circuits are arranged for all the antennas adopted by the space diversity, and the wireless communication quality is ensured.
The embodiment of the invention provides a processing device based on multi-antenna received signals, which is suitable for realizing the processing method based on the multi-antenna received signals shown in figure 2. Fig. 3 is a schematic structural diagram of a processing apparatus based on multiple antenna received signals according to an embodiment of the present invention. Referring to fig. 3, the processing apparatus includes:
an amplitude value determining module 201, configured to determine an amplitude value of the baseband signal; the baseband signal is converted from a radio frequency signal received by an antenna, and the antenna is any one of at least two pairs of antennas adopted by space diversity;
an attenuation amount determining module 202, configured to determine, according to the amplitude value of the baseband signal, an attenuation amount of an amplifying circuit corresponding to the antenna; the amplifying circuit corresponding to the antenna is used for amplifying the radio-frequency signal received by the antenna before the radio-frequency signal is converted into a baseband signal, and the attenuation of the amplifying circuit is used for adjusting the gain of the amplifying circuit;
a data generating module 203 for generating at least two sets of control data according to the attenuation amount; each group of control data comprises an antenna mark, a serial number and a partial digital string of the attenuation, at least two groups of partial digital strings of the attenuation in the control data are arranged according to the sequence of the serial numbers in each group of control data, and the numerical value represented by the complete digital string is equal to the attenuation;
And the data transmission module 204 is configured to transmit at least two sets of control data sequentially through a control line, the control line is connected to the amplification circuits corresponding to all antennas used in the space diversity, and the amplification circuits corresponding to the antennas receive the at least two sets of control data to obtain an attenuation amount and adjust a gain according to the attenuation amount.
Alternatively, the data transmission module 204 may be configured to,
and control data generated by the attenuation of the amplifying circuits corresponding to all the antennas adopted by the space diversity is transmitted sequentially through the control line.
Further, the attenuation determination module 202 may be configured to,
sampling the baseband signal once every set time to obtain an amplitude value of the baseband signal during each sampling;
and taking the average value of the amplitude values of the baseband signal in the multiple sampling as the amplitude value of the baseband signal.
Alternatively, the attenuation determination module 202 may be configured to,
acquiring an upper limit value and a lower limit value;
when the amplitude value of the baseband signal is between the upper limit value and the lower limit value, the attenuation quantity of an amplifying circuit corresponding to the antenna is kept unchanged;
when the amplitude value of the baseband signal is larger than the upper limit value, the attenuation of an amplifying circuit corresponding to the antenna is increased;
and when the amplitude value of the baseband signal is smaller than the lower limit value, reducing the attenuation of the amplifying circuit corresponding to the antenna.
Further, the attenuation amount determination module 202 may be configured to,
changing an amplitude value of the baseband signal;
demodulating the baseband signal with the changed amplitude value to obtain a digital signal;
and determining the upper limit value and the lower limit value according to whether the digital signal is correctly demodulated.
Optionally, the processing device may further include:
the demodulation module is used for demodulating the baseband signal to obtain a digital signal;
the decoding module is used for decoding the digital signal to obtain decoding data and error correction data;
the error correction module is used for determining the error rate of the decoded data according to the error correction data;
and the output module is used for outputting the decoding data with the minimum error rate in the decoding data obtained by the radio frequency signals received by all the antennas adopted by the space diversity.
Further, the processing device may further include:
a synchronization module for performing code synchronization on the digital signal before decoding the digital signal;
the output module is used for outputting decoded data obtained by decoding the digital signals successfully synchronized by the codes when only one path of the digital signals obtained by the radio-frequency signals received by all the antennas adopted by the space diversity is successfully synchronized by the codes; and when at least two paths of successful codes are synchronized in the digital signals obtained by the radio frequency signals received by all the antennas adopted by the space diversity, decoding data with the minimum error rate in the decoded data obtained by decoding the digital signals with the successful codes.
Optionally, the processing device may further include:
the receiving module is used for receiving radio frequency signals through an antenna;
the first amplification module is used for amplifying the radio-frequency signal by adopting a radio-frequency amplification circuit, and the radio-frequency amplification circuit is an amplification circuit corresponding to the antenna;
the first conversion module is used for carrying out frequency conversion on the amplified radio frequency signal to obtain an intermediate frequency signal;
the second amplifying module is used for amplifying the intermediate-frequency signal by adopting an intermediate-frequency amplifying circuit, and the intermediate-frequency amplifying circuit is an amplifying circuit corresponding to the antenna;
and the second conversion module is used for carrying out frequency conversion on the amplified intermediate frequency signal to obtain a baseband signal.
Alternatively, the number of antennas used for spatial diversity may be two, and the two antennas are respectively disposed on two surfaces opposite to the receiver.
It should be noted that: in the processing apparatus based on multi-antenna received signals provided in the foregoing embodiments, when processing signals based on multi-antenna received signals, only the division of the above functional modules is illustrated, and in practical applications, the above functions may be distributed to different functional modules according to needs, that is, the internal structure of the apparatus may be divided into different functional modules to complete all or part of the functions described above. In addition, the processing apparatus based on multiple antenna received signals provided in the foregoing embodiments and the processing method based on multiple antenna received signals provided in the foregoing embodiments belong to the same concept, and details of a specific implementation process thereof are referred to in the method embodiments and are not described herein again.
The above-mentioned serial numbers of the embodiments of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A processing method based on multi-antenna received signals, the processing method comprising:
determining an amplitude value of the baseband signal; the baseband signal is converted from a radio frequency signal received by an antenna, and the antenna is any one of at least two pairs of antennas adopted by space diversity;
determining the attenuation of an amplifying circuit corresponding to the antenna according to the amplitude value of the baseband signal; the amplifying circuit corresponding to the antenna is used for amplifying a radio-frequency signal received by the antenna before the radio-frequency signal is converted into the baseband signal, and the attenuation of the amplifying circuit is used for adjusting the gain of the amplifying circuit;
Generating at least two sets of control data according to the attenuation amount; each group of control data comprises an antenna mark, a serial number and a partial digital string of the attenuation, the partial digital strings of the attenuation in the at least two groups of control data are arranged according to the sequence of the serial numbers in the control data, and the numerical value represented by the complete digital string is equal to the attenuation;
and transmitting the at least two groups of control data through control lines in sequence, wherein the control lines are connected with amplifying circuits corresponding to all antennas adopted by the space diversity, the amplifying circuits corresponding to the antennas receive the at least two groups of control data to obtain the attenuation and adjust the gain according to the attenuation, the amplifying circuits corresponding to the antennas comprise a radio frequency amplifying circuit and an intermediate frequency amplifying circuit, the control data of the radio frequency amplifying circuit are transmitted through five control lines, and the control data of the intermediate frequency amplifying circuit are transmitted through four control lines.
2. The processing method according to claim 1, wherein said transmitting the at least two sets of control data sequentially through control lines comprises:
and control data generated by the attenuation of the amplifying circuits corresponding to all the antennas adopted by the space diversity are transmitted sequentially through the control line.
3. The processing method of claim 2, wherein determining the amplitude values of the baseband signal comprises:
sampling the baseband signal once every set time to obtain an amplitude value of the baseband signal during each sampling;
and taking the average value of the amplitude values of the baseband signal during multiple times of sampling as the amplitude value of the baseband signal.
4. The processing method according to any one of claims 1 to 3, wherein the determining an attenuation amount of an amplifying circuit corresponding to the antenna according to the amplitude value of the baseband signal comprises:
acquiring an upper limit value and a lower limit value;
when the amplitude value of the baseband signal is between the upper limit value and the lower limit value, the attenuation quantity of an amplifying circuit corresponding to the antenna is kept unchanged;
when the amplitude value of the baseband signal is larger than the upper limit value, increasing the attenuation of an amplifying circuit corresponding to the antenna;
and when the amplitude value of the baseband signal is smaller than the lower limit value, reducing the attenuation of the amplifying circuit corresponding to the antenna.
5. The processing method according to claim 4, wherein the obtaining the upper limit value and the lower limit value comprises:
Changing an amplitude value of the baseband signal;
demodulating the baseband signal with the changed amplitude value to obtain a digital signal;
and determining the upper limit value and the lower limit value according to whether the digital signal is correctly demodulated.
6. The treatment method according to any one of claims 1 to 3, further comprising:
demodulating the baseband signal to obtain a digital signal;
decoding the digital signal to obtain decoded data and error correction data;
determining the error rate of the decoded data according to the error correction data;
and outputting the decoding data with the minimum error rate in the decoding data obtained by the radio frequency signals received by all the antennas adopted by the space diversity.
7. The processing method according to claim 6, characterized in that it further comprises:
code synchronizing the digital signal prior to decoding the digital signal;
when only one path of successful code synchronization exists in digital signals obtained by radio frequency signals received by all antennas adopted by space diversity, decoding data obtained by decoding the digital signals successfully synchronized by the code synchronization is output;
and when at least two paths of successful codes are synchronized in the digital signals obtained by the radio frequency signals received by all the antennas adopted by the space diversity, decoding data with the minimum error rate in the decoded data obtained by decoding the digital signals with the successful codes.
8. The treatment method according to any one of claims 1 to 3, further comprising:
receiving a radio frequency signal through the antenna;
amplifying the radio frequency signal by adopting a radio frequency amplifying circuit, wherein the radio frequency amplifying circuit is an amplifying circuit corresponding to the antenna;
performing frequency conversion on the amplified radio frequency signal to obtain an intermediate frequency signal;
amplifying the intermediate-frequency signal by adopting an intermediate-frequency amplifying circuit, wherein the intermediate-frequency amplifying circuit is an amplifying circuit corresponding to the antenna;
and performing frequency conversion on the amplified intermediate frequency signal to obtain the baseband signal.
9. A processing method according to any one of claims 1 to 3, characterized in that the number of antennas used for spatial diversity is two, and the two antennas are respectively arranged on two opposite surfaces of the receiver.
10. A processing apparatus for receiving signals based on multiple antennas, the processing apparatus comprising:
the amplitude value determining module is used for determining an amplitude value of the baseband signal; the baseband signal is converted from a radio frequency signal received by an antenna, and the antenna is any one of at least two pairs of antennas adopted by space diversity;
The attenuation amount determining module is used for determining the attenuation amount of the amplifying circuit corresponding to the antenna according to the amplitude value of the baseband signal; the amplifying circuit corresponding to the antenna is used for amplifying a radio-frequency signal received by the antenna before the radio-frequency signal is converted into the baseband signal, and the attenuation of the amplifying circuit is used for adjusting the gain of the amplifying circuit;
the data generation module is used for generating at least two groups of control data according to the attenuation amount; each group of control data comprises an antenna mark, a serial number and a partial digital string of the attenuation, the partial digital strings of the attenuation in the at least two groups of control data are arranged according to the sequence of the serial numbers in the control data, and the numerical value represented by the complete digital string is equal to the attenuation;
the data transmission module is used for transmitting the at least two groups of control data through control lines in sequence, the control lines are connected with the amplifying circuits corresponding to all antennas used for space diversity, the amplifying circuits corresponding to the antennas receive the at least two groups of control data to obtain the attenuation and adjust the gain according to the attenuation, the amplifying circuits corresponding to the antennas comprise radio frequency amplifying circuits and intermediate frequency amplifying circuits, the control data of the radio frequency amplifying circuits are transmitted through five control lines, and the control data of the intermediate frequency amplifying circuits are transmitted through four control lines.
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