CN114829954A - Reflection coefficient measuring method and device - Google Patents
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Abstract
The application provides a reflection coefficient measuring method and device, relates to the technical field of communication, and is used for measuring a reflection coefficient in a broadband transmission system so as to improve the antenna transmission performance of the system. The method comprises the following steps: acquiring a transmission signal in a transmission frequency band; determining a frequency domain component signal of the transmission signal in at least one frequency band, wherein the at least one frequency band is a frequency band of the transmission frequency band, the bandwidth of which is smaller than that of the transmission frequency band, and the at least one frequency band comprises a first frequency band; and determining a first reflection coefficient of the first frequency band according to the frequency domain component signal corresponding to the transmission signal in the first frequency band.
Description
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for measuring a reflection coefficient.
The terminal antenna is used as a power and electromagnetic energy conversion device, and its impedance may change at different operating frequencies and in different usage scenarios (for example, the antenna is located at any position, at a hand-held position, or close to the head during a call). In addition, when the terminal transmits a high-frequency signal through the antenna, in order to efficiently transmit a radio-frequency signal to the antenna or to efficiently transmit a radio-frequency signal to a low-noise amplifier at a radio-frequency front end, it is necessary to ensure that a source impedance and a load impedance satisfy a power matching condition, that is, the source impedance and the load impedance are conjugate and equal. If the source impedance is mismatched with the load impedance, the power consumption of the terminal is increased, the battery life is reduced, and the communication is dropped, which results in a reduction in the user experience. The antenna tuning technology can be used for solving the problem of impedance mismatch in the high-frequency transmission process, and the key point of using the antenna tuning technology to carry out impedance matching is to monitor the reflection coefficient on the transmission line and adjust the radio frequency system with adjustable parameters based on the reflection coefficient so as to realize impedance matching.
In the prior art, reflection coefficient measurement in a transmission frequency band is mainly realized by measuring signal powers in different transmission directions. Specifically, a first power of a first signal transmitted in a forward direction is detected by a first power detector, a second power of a second signal transmitted in a reverse direction is detected by a second power detector, a third power of a signal obtained by adding the first signal to the second signal is detected by a third power detector, and a reflection coefficient in the transmission band is determined based on a plurality of detected powers.
Since the reflection coefficient on the transmission line increases with the bandwidth of the transmission signal, the difference in reflection coefficient at different frequencies becomes large. Therefore, the above method for determining the reflection coefficient based on the signal powers measured in different transmission directions is only applicable to a transmission system with a small transmission band, but cannot be applied to a broadband transmission system.
Disclosure of Invention
The application provides a reflection coefficient measuring method and device, which are used for measuring the reflection coefficient in a broadband transmission system so as to improve the antenna transmission performance of the system.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:
in a first aspect, a reflection coefficient measuring method is provided, which includes: acquiring a transmission signal in a transmission frequency band, where the transmission frequency band may be a broadband, for example, a bandwidth of the transmission frequency band is greater than a preset bandwidth; determining a frequency domain component signal of the transmission signal in at least one frequency band, where the at least one frequency band is a frequency band of the transmission frequency band with a bandwidth smaller than that of the transmission frequency band, and the at least one frequency band includes a first frequency band, for example, a frequency range of the transmission frequency band includes a frequency range of the first frequency band; and determining a first reflection coefficient of the first frequency band according to the frequency domain component signal corresponding to the transmission signal in the first frequency band.
In the above technical solution, the transmission signal in the transmission frequency band is divided into the frequency domain component signals in at least one frequency band whose bandwidth is smaller than the bandwidth of the transmission frequency band, and the first reflection coefficient of the first frequency band is determined according to the frequency domain component signal corresponding to the transmission signal in the first frequency band in the at least one frequency band, so that the reflection coefficient of the first frequency band with a smaller bandwidth can be accurately measured, that is, the transmission signal in the transmission frequency band is divided into the frequency domain component signals in one or more narrow bands, so that the reflection coefficient on the narrow band is accurately measured based on the frequency domain component signals in the narrow band, and the antenna transmission performance of the system is further improved.
In a possible implementation manner of the first aspect, determining a frequency domain component signal of the transmission signal in at least one frequency band includes: converting the transmission signal into a frequency domain signal, for example, the transmission signal is a time domain signal, and the transmission signal can be converted into a corresponding frequency domain signal through fourier transform; the frequency domain signal is divided into frequency domain component signals in at least one frequency band by means of frequency domain division, for example, the frequency domain signal can be divided into frequency domain component signals in at least one frequency band according to coefficients of the frequency domain signal. In the above possible implementation, a simple and efficient way of determining frequency domain component signals in at least one frequency band is provided.
In a possible implementation manner of the first aspect, determining a frequency domain component signal of the transmission signal in at least one frequency band includes: determining a time domain component signal of the transmission signal in at least one frequency band, for example, performing filtering processing of at least one frequency band on the transmission signal respectively to obtain the time domain component signal in the at least one frequency band correspondingly, or performing frequency shift processing of at least one frequency band on the transmission signal respectively, and performing filtering processing of the same frequency band on the signal after the frequency domain to obtain the time domain component signal in the at least one frequency band correspondingly; the time domain component signal in each of the at least one frequency band is converted into a frequency domain component signal in the frequency band, for example, the time domain component signal in each frequency band is converted into a frequency domain component signal in the frequency band by fourier transform. In the above possible implementation, another way of simply and efficiently determining the frequency domain component signals in at least one frequency band is provided.
In a possible implementation manner of the first aspect, the determining, by the transmission signal including a forward coupling signal and a backward coupling signal, a first reflection coefficient of a first frequency band according to a frequency domain component signal corresponding to the transmission signal in the first frequency band includes: determining a first reflection coefficient of a first frequency band according to two frequency domain component signals corresponding to a forward coupling signal and a backward coupling signal in the first frequency band; this approach may be applicable to the case where the directional coupler acquires both the forward coupled signal and the reverse coupled signal. Or, the determining a first reflection coefficient of the first frequency band according to the frequency domain component signal corresponding to the transmission signal in the first frequency band includes: determining a first forward coupling coefficient according to a forward transmission signal during forward coupling in a first frequency band and two frequency domain component signals corresponding to the forward coupling signal; determining a first reverse coupling coefficient according to two frequency domain component signals corresponding to a forward transmission signal and a reverse coupling signal during reverse coupling in a first frequency band; determining a first reflection coefficient of a first frequency band according to the first forward coupling coefficient and the first backward coupling coefficient; this approach is applicable to the case where the directional coupler separately acquires the forward coupled signal and the reverse coupled signal. In the above possible implementation manners, two different manners of determining the first reflection coefficient are provided, and in practical applications, an appropriate determination manner may be selected according to whether the coupler simultaneously obtains the forward transmission signal and the backward coupling signal, or respectively obtains the forward transmission signal and the backward coupling signal, so as to improve accuracy and flexibility of determining the first reflection coefficient of the first frequency band.
In a possible implementation manner of the first aspect, the at least one frequency band further includes a second frequency band, and a frequency range of the first frequency band is different from a frequency range of the second frequency band; optionally, the frequency band range of the first frequency band and the frequency band range of the second frequency band may have partial overlap or no overlap, and/or the bandwidth of the first frequency band and the bandwidth of the second frequency band may be equal or unequal; the method further comprises the following steps: determining a second reflection coefficient of a second frequency band; and determining the reflection coefficient of each frequency point from the first frequency band to the second frequency band according to the first reflection coefficient and the second reflection coefficient, for example, performing interpolation fitting processing on the first reflection coefficient and the second reflection coefficient to obtain a reflection coefficient model, and determining the reflection coefficient of each frequency point from the first frequency band to the second frequency band according to the reflection coefficient model. In the possible implementation manner, the continuous reflection coefficient function from the first frequency band to the second frequency band can be obtained by performing interpolation fitting processing on the reflection coefficients from the first frequency band to the second frequency band based on the first reflection coefficient and the second reflection coefficient, so that the reflection coefficient of any frequency point from the first frequency band to the second frequency band can be determined according to the continuous reflection coefficient function, and when the reflection coefficient changes violently or slowly along with the frequency band bandwidth or frequency, the reflection coefficient of any frequency point can be accurately determined, so that the transmission state of the device can be known more accurately, and the device can be supported to obtain better antenna transmission performance.
In a possible implementation manner of the first aspect, the method further includes: filtering out at least one of the following signals in the frequency domain component signals in the at least one frequency band: the direct current signal is a component signal with image interference, and the signal intensity is smaller than the component signal with preset intensity. In the above possible implementation manner, by filtering out the interference and the noise, the signal-to-noise ratio of the frequency domain component signal in at least one frequency band may be improved, so that when the reflection coefficient of each frequency band is determined based on the filtered frequency domain component signal through the following steps, the accuracy of the reflection coefficient may be improved.
In a second aspect, there is provided a reflectance measuring apparatus, comprising: the directional coupler is used for acquiring a transmission signal in a transmission frequency band; a processor configured to determine a frequency domain component signal of the transmission signal in at least one frequency band, where the at least one frequency band is a frequency band of the transmission frequency band having a bandwidth smaller than a bandwidth of the transmission frequency band, and the at least one frequency band includes a first frequency band; the processor is further configured to determine a first reflection coefficient of the first frequency band according to the frequency domain component signal corresponding to the transmission signal in the first frequency band.
In one possible implementation manner of the second aspect, the processor is further configured to: converting the transmission signal into a frequency domain signal; and dividing the digital signal corresponding to the transmission signal into frequency domain component signals in at least one frequency band.
In one possible implementation form of the second aspect, the apparatus further comprises a time domain division circuit; the time domain division circuit is used for determining a time domain component signal of the transmission signal in at least one frequency band; the processor is further configured to convert the time domain component signals in each of the at least one frequency band into frequency domain component signals in the frequency band.
In one possible implementation manner of the second aspect, the time domain division circuit includes: at least one band-pass filter, which is used for respectively carrying out filtering processing of at least one frequency band on the transmission signal to correspondingly obtain a time domain component signal in the at least one frequency band; or, at least one frequency shifter is used for respectively performing frequency shift processing of at least one frequency band on the transmission signal; and the band-pass filter is used for performing filtering processing on the frequency-shifted signals in the same frequency band to correspondingly obtain time domain component signals in the at least one frequency band.
In one possible implementation manner of the second aspect, the transmission signal includes a forward coupling signal and a reverse coupling signal, and the processor is further configured to: and determining a first reflection coefficient of the first frequency band according to the two frequency domain component signals corresponding to the forward coupling signal and the backward coupling signal in the first frequency band.
In one possible implementation manner of the second aspect, the transmission signal includes a forward transmission signal in forward coupling, a forward coupling signal, a forward transmission signal in reverse coupling, and a reverse coupling signal, and the processor is further configured to: determining a first forward coupling coefficient according to the forward transmission signal in forward coupling in a first frequency band and two frequency domain component signals corresponding to the forward coupling signal; determining a first backward coupling coefficient according to the forward transmission signal and two frequency domain component signals corresponding to the backward coupling signal when the forward transmission signal and the backward coupling signal are reversely coupled in a first frequency band; a first reflection coefficient for the first frequency band is determined based on the first forward coupling coefficient and the first backward coupling coefficient.
In a possible implementation manner of the second aspect, the at least one frequency band further includes a second frequency band, and the frequency range of the first frequency band is different from that of the second frequency band, and the processor is further configured to: determining a second reflection coefficient of a second frequency band; and determining the reflection coefficient of each frequency point from the first frequency band to the second frequency band according to the first reflection coefficient and the second reflection coefficient.
In one possible implementation manner of the second aspect, the processor is further configured to: performing interpolation fitting processing on the first reflection coefficient and the second reflection coefficient to obtain a reflection coefficient model; and determining the reflection coefficient of each frequency point from the first frequency band to the second frequency band according to the reflection coefficient model.
In one possible implementation manner of the second aspect, the processor is further configured to: filtering out at least one of the following signals in the frequency domain component signals in the at least one frequency band: the direct current signal with interference exists, the component signal with image interference exists, and the signal intensity is smaller than the component signal with preset intensity.
In a third aspect, there is provided a reflection coefficient measuring apparatus, comprising: an acquisition unit configured to acquire a transmission signal within a transmission frequency band; a determining unit, configured to determine a frequency domain component signal of the transmission signal in at least one frequency band, where the at least one frequency band is a frequency band of the transmission frequency band with a bandwidth smaller than that of the transmission frequency band, and the at least one frequency band includes a first frequency band; and the determining unit is further used for determining a first reflection coefficient of the first frequency band according to the frequency domain component signal corresponding to the transmission signal in the first frequency band.
In a possible implementation manner of the third aspect, the determining unit is further configured to: converting the transmission signal into a frequency domain signal; the frequency domain signal is divided into frequency domain component signals within at least one frequency band.
In a possible implementation manner of the third aspect, the apparatus further includes: a dividing unit, configured to determine a time domain component signal of the transmission signal in at least one frequency band; a converting unit, configured to convert the time domain component signal in each frequency band of the at least one frequency band into a frequency domain component signal in the frequency band.
In a possible implementation manner of the third aspect, the dividing unit is further configured to: respectively carrying out filtering processing of at least one frequency band on the transmission signals to correspondingly obtain time domain component signals in at least one frequency band; or, respectively performing frequency shift processing of at least one frequency band on the transmission signal, and performing filtering processing of the same frequency band on the signal after the frequency domain, so as to correspondingly obtain a time domain component signal in at least one frequency band.
In a possible implementation manner of the third aspect, the transmission signal includes a forward coupling signal and a reverse coupling signal, and the determining unit is further configured to: and determining a first reflection coefficient of the first frequency band according to two frequency domain component signals corresponding to the forward coupling signal and the backward coupling signal in the first frequency band.
In a possible implementation manner of the third aspect, the transmission signal includes a forward transmission signal in forward coupling, a forward coupling signal, a forward transmission signal in reverse coupling, and a reverse coupling signal, and the determining unit is further configured to: determining a first forward coupling coefficient according to a forward transmission signal during forward coupling in a first frequency band and two frequency domain component signals corresponding to the forward coupling signal; determining a first reverse coupling coefficient according to two frequency domain component signals corresponding to a forward transmission signal and a reverse coupling signal during reverse coupling in a first frequency band; a first reflection coefficient for the first frequency band is determined based on the first forward coupling coefficient and the first backward coupling coefficient.
In a possible implementation manner of the third aspect, the at least one frequency band further includes a second frequency band, and the frequency range of the first frequency band is different from that of the second frequency band, and the determining unit is further configured to: determining a second reflection coefficient of a second frequency band; and determining the reflection coefficient of each frequency point from the first frequency band to the second frequency band according to the first reflection coefficient and the second reflection coefficient.
In a possible implementation manner of the third aspect, the determining unit is further configured to: performing interpolation fitting processing on the first reflection coefficient and the second reflection coefficient to obtain a reflection coefficient model; and determining the reflection coefficient of each frequency point from the first frequency band to the second frequency band according to the reflection coefficient model.
In a possible implementation manner of the third aspect, the determining unit is further configured to: filtering out at least one of the following signals in the frequency domain component signals in at least one frequency band: the direct current signal is a component signal with image interference, and the signal intensity is smaller than the component signal with preset intensity.
In yet another aspect of the present application, there is provided a reflection coefficient measuring apparatus, which is a wireless communication device or a chip system applied to a wireless communication device, and includes a processor and a memory, where the memory stores instructions, and the processor executes the instructions in the memory to cause the apparatus to perform the reflection coefficient measuring method as provided in the second aspect or any possible implementation manner of the second aspect.
In a further aspect of the present application, a readable storage medium is provided, which has stored therein instructions that, when run on a device, cause the device to perform the reflection coefficient measurement method as provided by the second aspect or any one of the possible implementations of the second aspect.
In a further aspect of the present application, a computer program product is provided, which, when run on a computer, causes the computer to perform the reflection coefficient measuring method provided by the second aspect or any of the possible implementations of the second aspect.
It is understood that any device, readable storage medium or computer program product of the reflection coefficient measuring method provided above is used to execute the corresponding method provided above, and therefore, the beneficial effects achieved by the method can refer to the beneficial effects in the corresponding method provided above, and are not described herein again.
Fig. 1 is a schematic structural diagram of a wireless communication device according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a reflection coefficient measuring method according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of determining frequency domain component signals of different frequency bands according to an embodiment of the present application;
fig. 4 is a schematic diagram of another method for determining frequency domain component signals of different frequency bands according to an embodiment of the present application;
fig. 5 is a schematic diagram of determining frequency domain component signals of different frequency bands according to an embodiment of the present application;
FIG. 6 is a schematic flow chart of another reflectance measurement method provided in the embodiments of the present application;
fig. 7 is a schematic structural diagram of a reflection coefficient measuring apparatus according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of another reflection coefficient measurement apparatus according to an embodiment of the present disclosure.
In the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a and b, a and c, b and c, or a, b and c, wherein a, b and c can be single or multiple. In addition, the embodiments of the present application use the words "first", "second", etc. to distinguish objects with similar names or functions or actions, and those skilled in the art will understand that the words "first", "second", etc. do not limit the quantity and execution order. The term "coupled" is used to indicate electrical connection, including direct connection through wires or connections, or indirect connection through other devices. Thus, "coupled" should be considered as an electronic communication connection in a broad sense.
In this application, the words "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
The technical scheme of the application can be applied to various wireless communication devices adopting the reflection coefficient measuring device. The wireless communication device may be deployed on land, including indoors or outdoors, hand-held, or in a vehicle. And can also be deployed on the water surface (such as a ship and the like). And may also be deployed in the air (e.g., airplanes, balloons, satellites, etc.). For example, the radio channel device may be a terminal or a base station. For example, the terminal includes but is not limited to: mobile phone (mobile phone), tablet computer, notebook computer, palm computer, Mobile Internet Device (MID), wearable device (e.g. smart watch, smart bracelet, pedometer, etc.), vehicle-mounted device (e.g. car, bicycle, electric car, airplane, ship, train, high-speed rail, etc.), Virtual Reality (VR) device, Augmented Reality (AR) device, wireless terminal in industrial control (industrial control), smart home device (e.g. refrigerator, television, air conditioner, electric meter, etc.), smart robot, workshop device, wireless terminal in unmanned-driving (self-driving), wireless terminal in remote surgery (remote medical supply), wireless terminal in smart grid (smart grid), wireless terminal in transportation safety (security), wireless terminal in smart city (city), or a wireless terminal, a flying device (e.g., a smart robot, a hot air balloon, a drone, an airplane), etc. in a smart home (smart home).
Fig. 1 is a schematic structural diagram of a wireless communication device according to an embodiment of the present application, where the wireless communication device is described by taking a mobile phone as an example. The wireless communication apparatus includes: a baseband processor (modem), a Radio Frequency Integrated Circuit (RFIC), a radio frequency front end module (RF FEM), and an antenna (antenna).
The baseband processor has a baseband processing function and can be used for processing baseband signals. The radio frequency integrated circuit RFIC may be used to implement modulation or demodulation between baseband signals and radio frequency signals. The radio frequency integrated circuit RFIC may include one or more transmission channels, each of which may include an analog-to-digital converter (DAC), a Low Pass Filter (LPF), an up converter (up converter), and a Driver Amplifier (DA), and one or more reception channels, each of which may include a digital-to-analog converter (ADC), a Low Pass Filter (LPF), and a down converter (down converter). The RF front-end module RF FEM may be used to provide power amplification or filtering functions. The rf front-end module 3 may also include one or more transmit (Tx) channels and one or more receive (Rx) channels, each transmit channel may include a Power Amplifier (PA), a transmit filter (Tx filter), and a duplexer (duplex), each receive channel may include a Low Noise Amplifier (LNA) and a duplexer (duplex), and the duplexer may be replaced by an antenna switch (antenna switch). The antenna can be used for receiving or transmitting signals, namely, energy conversion between radio frequency signals and electromagnetic waves is realized.
Further, the wireless communication device may further include a reflection coefficient measuring device, and the reflection coefficient measuring device may be configured to measure a reflection coefficient of the RF front-end module RF FEM. For example, the reflection coefficient measuring apparatus may include a processor, a directional coupler (directional coupler), and the like, and the processor may be a baseband processor, a microprocessor, or other circuits or processing chips that can be used to implement the functions of the processor. Optionally, all devices or functions in the reflection coefficient measuring apparatus may be separately provided, or some or all of the devices or functions may be integrated in a baseband processor, a radio frequency integrated circuit RFIC, or a radio frequency front end module RF FEM of the terminal, which is not limited in this application.
Fig. 2 is a flowchart illustrating a reflection coefficient measurement method according to an embodiment of the present application, where the method is applicable to the wireless communication device shown in fig. 1, and the method includes the following steps.
S201: a transmission signal within a transmission frequency band is acquired.
The transmission frequency band may refer to a frequency band having a certain bandwidth, and the bandwidth of the transmission frequency band may be greater than a preset bandwidth, for example, the preset bandwidth may be 50MHz or 100 MHz. The transmission signal may be a time domain signal, which is used to characterize the change of the transmission signal over time. In one possible example, the transmission signal may include a forward coupled signal and a reverse coupled signal. In another possible example, the transmission signal may include a forward transmission signal, which may be a transmission signal of the wireless communication device, a forward coupling signal, and a reverse coupling signal.
Specifically, the transmission signal of the wireless communication device may be referred to as a forward transmission signal, a frequency band of the forward transmission signal is referred to as a transmission frequency band, and when the wireless communication device sends the forward transmission signal to another device, the wireless communication device may obtain a forward coupling signal and a reverse coupling signal corresponding to the forward transmission signal in the transmission frequency band. For example, the wireless communication device includes a directional coupler, where the directional coupler has a forward coupling port and a reverse coupling port, and if the forward coupling port and the reverse coupling port can be simultaneously opened at the same time, the directional coupler can simultaneously acquire a forward coupling signal and a reverse coupling signal corresponding to the forward transmission signal, and if only one port of the forward coupling port and the reverse coupling port can be opened at the same time, the directional coupler can acquire a forward coupling signal corresponding to the forward transmission signal when the forward coupling port is opened, and acquire a reverse coupling signal corresponding to the forward transmission signal when the reverse coupling port is opened. It should be noted that the forward transmission signals when the forward coupling port and the reverse coupling port are opened only need to have the same bandwidth in the frequency domain, and the forward transmission signals in both cases may not need to be identical.
S202: determining a frequency domain component signal of the transmission signal in at least one frequency band, wherein the at least one frequency band is a frequency band of the transmission frequency band with a bandwidth smaller than that of the transmission frequency band, and the at least one frequency band comprises a first frequency band.
The at least one frequency band may include one or more frequency bands, for example, the at least one frequency band includes a first frequency band. The at least one frequency band is a frequency band of the transmission frequency band whose bandwidth is smaller than that of the transmission frequency band, which means that the bandwidth of each of the one or more frequency bands is smaller than that of the transmission frequency band, and the frequency range of the transmission frequency band includes the frequency range of the one or more frequency bands. In addition, when the at least one frequency band includes at least two frequency bands (i.e., two or more frequency bands), the frequency ranges of the at least two frequency bands may be different, for example, the at least one frequency band includes a first frequency band and a second frequency band, and the frequency range of the first frequency band is different from the frequency range of the second frequency band. Optionally, frequency band ranges of two adjacent frequency bands in the at least two frequency bands may partially overlap or do not overlap, and bandwidths of the at least two frequency bands may be equal or unequal, which is not specifically limited in this embodiment of the application. For example, if the bandwidth of the transmission frequency band is 120MHz, the corresponding frequency range is 700MHz to 820MHz, the number of at least one frequency band is 3, and the bandwidth of each frequency band is 40MHz, the at least one frequency band may be 700MHz to 740MHz, 740MHz to 780MHz, and 780MHz to 820MHz in sequence.
Specifically, determining the frequency domain component signal of the transmission signal in at least one frequency band may include the following several possible implementations, which are described in detail below.
In one possible implementation, as shown in fig. 3, determining the frequency domain component signals of the transmission signal in at least one frequency band may include: converting the transmission signal into a frequency domain signal, for example, the transmission signal is a time domain signal, and the transmission signal can be converted into a corresponding frequency domain signal through fourier transform; the frequency domain signal is divided into frequency domain component signals in at least one frequency band by means of frequency domain division, for example, the frequency domain signal can be divided into frequency domain component signals in at least one frequency band according to coefficients of the frequency domain signal. When the transmission signal includes a forward coupling signal and a reverse coupling signal, or the transmission signal includes a forward transmission signal in forward coupling, a forward coupling signal, a forward transmission signal in reverse coupling, and a reverse coupling signal, each signal included in the transmission signal may be divided into frequency domain component signals in the at least one frequency band according to the manner. Fig. 3 illustrates an example in which the transmission signal includes a forward transmission signal in forward coupling, a forward coupling signal, and a forward transmission signal and a reverse coupling signal in reverse coupling.
A frequency domain signal corresponding to the forward coupling signal may be referred to as a first frequency domain signal, and a frequency domain component signal of the first frequency domain signal in the at least one frequency band may be referred to as a first frequency domain component signal; a frequency domain signal corresponding to the reverse coupling signal may be referred to as a second frequency domain signal, and a frequency domain component signal of the second frequency domain signal in the at least one frequency band may be referred to as a second frequency domain component signal; a frequency domain signal corresponding to the forward transmission signal in the forward coupling may be referred to as a third frequency domain signal, and a frequency domain component signal of the third frequency domain signal in the at least one frequency band may be referred to as a third frequency domain component signal; the frequency domain signal corresponding to the forward transmission signal in the backward coupling may be referred to as a fourth frequency domain signal, and the frequency domain component signal of the fourth frequency domain signal in the at least one frequency band may be referred to as a fourth frequency domain component signal.
For example, assuming that the frequency range of the transmission band is 700MHz to 820MHz, at least one band is 700MHz to 740MHz, 740MHz to 780MHz, and 780MHz to 820MHz in sequence, the frequency range of each of the first frequency domain signal, the second frequency domain signal, the third frequency domain signal, and the fourth frequency domain signal is 700MHz to 820MHz, the number of each of the first frequency domain component signal, the second frequency domain component signal, the third frequency domain component signal, and the fourth frequency domain component signal is 3, and the frequency ranges of the 3 frequency domain component signals corresponding to each of the frequency domain component signals are 700MHz to 740MHz, 740MHz to 780MHz, and 780MHz to 820MHz in sequence.
In another possible implementation manner, determining the frequency domain component signal of the transmission signal in at least one frequency band may include: determining a time domain component signal of the transmission signal in at least one frequency band, for example, performing filtering processing of at least one frequency band on the transmission signal respectively to obtain the time domain component signal in the at least one frequency band correspondingly, or performing frequency shift processing of at least one frequency band on the transmission signal respectively, and performing filtering processing of the same frequency band on the signal after the frequency domain to obtain the time domain component signal in the at least one frequency band correspondingly; the time domain component signal in each of the at least one frequency band is converted into a frequency domain component signal in the frequency band, for example, the time domain component signal in each frequency band is converted into a frequency domain component signal in the frequency band by fourier transform.
Optionally, as shown in fig. 4, the wireless communication device may include at least one band-pass filter, where the at least one band-pass filter corresponds to the at least one frequency band one to one, so that the time-domain component signal in the at least one frequency band can be obtained after the time-domain signal of the transmission signal is filtered by using the at least one band-pass filter. Alternatively, as shown in fig. 5, the wireless communication device may include at least one frequency shifter and a band pass filter, where the at least one frequency shifter corresponds to the at least one frequency band one to one, so that after the frequency shift processing is performed on the time domain signals of the transmission signal by using the at least one frequency shifter, at least one frequency shifted signal may be obtained, and the band pass filter is used to perform filtering processing on the at least one frequency shifted signal, so as to obtain the time domain component signal in the at least one frequency band. When the transmission signal includes a forward coupling signal and a reverse coupling signal, or the transmission signal includes a forward transmission signal in forward coupling, a forward coupling signal, a forward transmission signal in reverse coupling, and a reverse coupling signal, each signal included in the transmission signal may be divided into frequency domain component signals in the at least one frequency band in the manner described above. Fig. 4 and 5 illustrate examples of the transmission signals including a forward transmission signal in the case of forward coupling, a forward coupling signal, a forward transmission signal in the case of reverse coupling, and a reverse coupling signal.
It should be noted that, for the detailed description of the forward coupling coefficient determination, the backward coefficient determination of each frequency band, and the reflection coefficient interpolation referred in fig. 3 to fig. 5, reference may be made to the related descriptions in S203 to S205 below, and the embodiments of the present application are not described herein again.
Further, for the frequency domain component signals in at least one frequency band, the wireless communication device may further filter out at least one of the following signals in the frequency domain component signals in the at least one frequency band: the direct current signal is a component signal with image interference, and the signal intensity is smaller than the component signal with preset intensity. For example, the wireless communication device is integrated with an interference noise processing circuit, by which interference and noise in frequency domain component signals in at least one frequency band can be filtered out. By filtering out these interferences and noises, the signal-to-noise ratio of the frequency domain component signals in at least one frequency band can be improved, so that the accuracy of the reflection coefficient can be improved when the reflection coefficient of each frequency band is determined based on the filtered frequency domain component signals by the following steps.
S203: and determining a first reflection coefficient of the first frequency band according to the frequency domain component signal corresponding to the transmission signal in the first frequency band.
In one possible example, the determining the first reflection coefficient of the first frequency band according to the frequency domain component signal corresponding to the transmission signal in the first frequency band includes: determining a first forward coupling coefficient according to a forward transmission signal during forward coupling in a first frequency band and two frequency domain component signals corresponding to the forward coupling signal; determining a first reverse coupling coefficient according to two frequency domain component signals corresponding to a forward transmission signal and a reverse coupling signal during reverse coupling in a first frequency band; the first reflection coefficient of the first frequency band is determined according to the first forward coupling coefficient and the first backward coupling coefficient, for example, the ratio of the first backward coupling coefficient to the first forward coupling coefficient may be determined as the first reflection coefficient of the first frequency band.
The frequency domain component signal corresponding to the forward coupling signal is a first frequency domain component signal, the frequency domain component signal corresponding to the backward coupling signal is a second frequency domain component signal, and the frequency domain component signal corresponding to the forward transmission signal during the forward coupling is a third frequency domain component. For example, assume that a first frequency domain component signal in a first frequency band is y (k), a third frequency domain component is x (k), a first forward coupling coefficient is α, a signal angular frequency is w, and a time delay of the first frequency band is τ m And the noise and interference component signal is n (k), y (k) and x (k) satisfy the following formula (1).
By Y (k) X * (k) The phase information can be separated, and then the time delay tau can be obtained according to the slope estimation of the phase signal sequence m ，X * (k) Represents the conjugate of X (k). After time delay compensation is carried out, the time domain aligned first frequency domain component signal Y (k) is subjected to time delay compensation
And X (k) satisfy the following formula (2); in the formula,
and represents the signal after time delay compensation of N (k). Therefore, the estimated value α' of the first forward coupling coefficient α can be determined by the following formula (3).
It should be noted that, according to the above-mentioned manner for determining the first forward coupling coefficient, the first reverse coupling coefficient may also be determined, except that the first frequency domain component signal in the first frequency band is replaced by the second frequency domain component signal in the first frequency band, and the third frequency domain component in the first frequency band is replaced by the fourth frequency domain component signal in the first frequency band, and the specific process may refer to the above-mentioned manner for determining the first forward coupling coefficient, which is not described herein again in this embodiment of the application.
In another possible example, the transmission signal includes a forward coupling signal and a backward coupling signal, and determining the first reflection coefficient of the first frequency band according to the frequency domain component signal corresponding to the transmission signal in the first frequency band may include: and determining a first reflection coefficient of the first frequency band according to the two frequency domain component signals corresponding to the forward coupling signal and the backward coupling signal in the first frequency band. Optionally, the frequency domain component signal corresponding to the forward coupling signal is a first frequency domain component signal, and the frequency domain component signal corresponding to the backward coupling signal is a second frequency domain component signal, and then the first reflection coefficient of the first frequency band may be equal to a least square error estimation result of the second frequency domain component signal in the first frequency band and the first frequency domain component signal in the first frequency band, as shown in equation (3).
It should be noted that, the manner of determining the first reflection coefficient of the first frequency band is merely exemplary, and in practical applications, the first reflection coefficient may also be determined based on a frequency domain component signal in the first frequency band, and the foregoing example does not limit the embodiment of the present application, and the embodiment of the present application does not specifically limit this.
In the embodiment of the application, the transmission signal in the transmission frequency band is divided into the frequency domain component signals in at least one frequency band of which the bandwidth is smaller than the bandwidth of the transmission frequency band, and the first reflection coefficient of the first frequency band is determined according to the frequency domain component signal corresponding to the transmission signal in the first frequency band in the at least one frequency band, so that the reflection coefficient of the first frequency band with a smaller bandwidth can be accurately measured, and the antenna transmission performance of the wireless communication device is improved.
Further, the at least one frequency band further includes a second frequency band, and a frequency range of the first frequency band is different from a frequency range of the second frequency band, as shown in fig. 6, the method further includes: S204-S205.
S204: a second reflection coefficient for a second frequency band is determined. The process of determining the second reflection coefficient of the second frequency band is similar to the process of determining the first reflection coefficient of the first frequency band provided in the foregoing, and reference may be specifically made to the description in the foregoing, and details of the embodiment of the present application are not repeated herein.
S205: and determining the reflection coefficient of each frequency point from the first frequency band to the second frequency band according to the first reflection coefficient and the second reflection coefficient.
The first reflection coefficient may be used as a reflection coefficient of a center frequency point of the first frequency band, and the second reflection coefficient may be used as a reflection coefficient of a center frequency point of the second frequency band. Optionally, the first frequency band and the second frequency band may be two adjacent frequency bands in at least one frequency band. For example, the at least one frequency band may be 700MHz to 740MHz, 740MHz to 780MHz, and 780MHz to 820MHz in sequence, the first frequency band may be 700MHz to 740MHz, the second frequency band may be 740MHz to 780MHz, the first reflection coefficient may be a reflection coefficient of 720MHz, and the second reflection coefficient may be a reflection coefficient of 760 MHz.
Specifically, determining the reflection coefficient of each frequency point from the first frequency band to the second frequency band according to the first reflection coefficient and the second reflection coefficient may include: carrying out interpolation fitting processing on the first reflection coefficient and the second reflection coefficient to obtain a reflection coefficient model; and determining the reflection coefficient of each frequency point from the first frequency band to the second frequency band according to the reflection coefficient model. For example, based on the first reflection coefficient and the second reflection coefficient, interpolation fitting processing is performed on the reflection coefficients of the first frequency band to the second frequency band, for example, the interpolation fitting processing may include processing manners such as first-order linear interpolation or fitting, polynomial interpolation or fitting, or sine sinc function interpolation or fitting, and a continuous reflection coefficient function of the first frequency band to the second frequency band may be obtained after the interpolation fitting processing, so that the reflection coefficient of any one frequency point of the first frequency band to the second frequency band may be determined according to the continuous reflection coefficient function. Further, when at least one frequency band includes three or more frequency bands, based on the reflection coefficient determined on each frequency band, the reflection coefficient of any frequency point in the transmission frequency band can be obtained through interpolation fitting processing.
The interpolation fitting processing method described above is merely exemplary, and is not limited to the embodiment of the present application, and in practical applications, other interpolation fitting processing methods may be used, and the embodiment of the present application is not particularly limited to the interpolation fitting processing method.
In the embodiment of the application, the continuous reflection coefficient function from the first frequency band to the second frequency band can be obtained by performing interpolation fitting processing on the reflection coefficients from the first frequency band to the second frequency band based on the first reflection coefficient and the second reflection coefficient, so that the reflection coefficient of any frequency point from the first frequency band to the second frequency band can be determined according to the continuous reflection coefficient function, and therefore, when the reflection coefficient changes violently or slowly along with the frequency band bandwidth or frequency, the reflection coefficient of any frequency point can be accurately determined, the transmission state of the wireless communication device can be known more accurately, and the wireless communication device can be supported to obtain better antenna transmission performance.
The above description mainly introduces the scheme provided by the embodiment of the present application from the perspective of a wireless communication device. It will be appreciated that the wireless communication device, in order to carry out the above-described functions, comprises corresponding hardware structures and/or software modules for performing the respective functions. Those of skill in the art would readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiment of the present application, the wireless communication device may be divided into functional modules according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be 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. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation. The following description will be given by taking the division of each function module corresponding to each function as an example:
fig. 7 shows a schematic diagram of a possible structure of the reflection coefficient measuring apparatus according to the above-described embodiment, in the case of an integrated unit. The device can be a wireless communication device or a chip built in the wireless communication device, and comprises: an acquisition unit 301 and a determination unit 302. The obtaining unit 301 is configured to support the apparatus to execute S201 in the foregoing embodiment; the determining unit 302 is used to support the apparatus to perform S202, S203 in the above embodiments, and/or other technical processes described herein. Further, the apparatus may further include: a dividing unit 303, and/or a converting unit 304.
In a possible embodiment, the conversion unit 304 is configured to convert the transmission signal into a frequency domain signal; the dividing unit 303 is further configured to divide the frequency domain signal into frequency domain component signals in at least one frequency band. In another possible embodiment, the dividing unit 303 is configured to determine a time domain component signal of the transmission signal in at least one frequency band; the converting unit 304 is configured to convert the time domain component signal in each of at least one frequency band into a frequency domain component signal in the frequency band. Optionally, the dividing unit 303 is further configured to perform filtering processing on at least one frequency band on the transmission signal, so as to obtain a time domain component signal in at least one frequency band correspondingly; or, the dividing unit 303 is further configured to perform frequency shift processing on at least one frequency band on the transmission signal, and perform filtering processing on the frequency-domain signal in the same frequency band, so as to obtain a time-domain component signal in at least one frequency band correspondingly.
Further, the apparatus further comprises a filtering unit 305 for filtering out at least one of the following signals in the frequency domain component signals in at least one frequency band: the direct current signal is a component signal with image interference, and the signal intensity is smaller than the component signal with preset intensity.
On the basis of hardware implementation, the obtaining unit 301 in this application may be a directional coupler of the apparatus, the determining unit 302, the converting unit 304, and the filtering unit 305 may be processors of the apparatus, and the dividing unit 303 may be a time domain dividing circuit.
Fig. 8 is a schematic diagram of a possible structure of a reflection coefficient measuring apparatus according to an embodiment of the present disclosure. The device can be a wireless communication device or a chip built in the wireless communication device, and comprises: directional coupler 401, time domain divider circuit 402, and processor 403. Wherein, the directional coupler 401 is used to support the apparatus to execute S201 in the above embodiment; the time domain division circuit 402 is used to support the apparatus to perform S202 in the above embodiment; the processor 403 is used to enable the apparatus to perform S203 in the above embodiments, and/or other processes for the techniques described herein. Optionally, the time-domain division circuit 402 comprises at least one band-pass filter; alternatively, the time-domain division circuit 402 includes at least one frequency shifter and one band-pass filter. Further, the processor 403 is further configured to: interference and noise in the frequency domain component signals in at least one frequency band are filtered out.
The processor 403 may be a baseband processor, a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination for implementing a computing function, for example, a combination including one or more microprocessors, a combination of a digital signal processor and a microprocessor, and the like, which are not particularly limited in this embodiment of the application.
It should be noted that all relevant contents of each step related to the method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.
In another embodiment of the present application, a readable storage medium is further provided, where the readable storage medium stores computer-executable instructions, and when a device (which may be a single chip, a chip, or the like) or a processor executes the steps in the reflection coefficient measurement method provided in the foregoing method embodiment. The aforementioned readable storage medium may include: u disk, removable hard disk, read only memory, random access memory, magnetic or optical disk, etc. for storing program codes.
In another embodiment of the present application, there is also provided a computer program product comprising computer executable instructions stored in a computer readable storage medium; the computer executable instructions may be read by at least one processor of the device from a computer readable storage medium, and the execution of the computer executable instructions by the at least one processor causes the device to perform the steps in the method for measuring signal reflection coefficient provided by the above-described method embodiments.
Finally, it should be noted that: the above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (20)
- A reflection coefficient measuring method, characterized in that the method comprises:acquiring a transmission signal in a transmission frequency band;determining a frequency domain component signal of the transmission signal in at least one frequency band, wherein the at least one frequency band is a frequency band with a bandwidth smaller than that of the transmission frequency band in the transmission frequency band, and the at least one frequency band comprises a first frequency band;and determining a first reflection coefficient of the first frequency band according to the frequency domain component signal corresponding to the transmission signal in the first frequency band.
- The method of claim 1, wherein the determining the frequency domain component signals of the transmission signal in at least one frequency band comprises:converting the transmission signal into a frequency domain signal;the frequency domain signal is divided into frequency domain component signals within at least one frequency band.
- The method of claim 1, wherein the determining the frequency domain component signals of the transmission signal in at least one frequency band comprises:determining a time domain component signal of the transmission signal in at least one frequency band;converting the time domain component signal in each of the at least one frequency band into a frequency domain component signal in the frequency band.
- The method of claim 3, wherein the determining the time domain component signal of the transmission signal in at least one frequency band comprises:respectively carrying out filtering processing of at least one frequency band on the transmission signals to correspondingly obtain time domain component signals in the at least one frequency band; or,and respectively carrying out frequency shift processing of at least one frequency band on the transmission signals, and carrying out filtering processing of the same frequency band on the signals after frequency domain, so as to correspondingly obtain time domain component signals in the at least one frequency band.
- The method according to any one of claims 1-4, wherein the transmitting signals comprise forward coupling signals and backward coupling signals, and the determining the first reflection coefficient of the first frequency band according to the frequency domain component signals corresponding to the transmitting signals in the first frequency band comprises:and determining a first reflection coefficient of the first frequency band according to two frequency domain component signals corresponding to the forward coupling signal and the backward coupling signal in the first frequency band.
- The method according to any one of claims 1-4, wherein the transmitting signals comprise a forward transmitting signal in forward coupling, a forward coupling signal, a forward transmitting signal in reverse coupling, and a reverse coupling signal, and the determining the first reflection coefficient of the first frequency band according to the frequency domain component signal corresponding to the transmitting signal in the first frequency band comprises:determining a first forward coupling coefficient according to a forward transmission signal during the forward coupling in the first frequency band and two frequency domain component signals corresponding to the forward coupling signal;determining a first reverse coupling coefficient according to a forward transmission signal during the reverse coupling in the first frequency band and two frequency domain component signals corresponding to the reverse coupling signal;and determining a first reflection coefficient of the first frequency band according to the first forward coupling coefficient and the first backward coupling coefficient.
- The method of any of claims 1-6, wherein the at least one frequency band further comprises a second frequency band, and wherein the first frequency band is different in frequency range from the second frequency band, the method further comprising:determining a second reflection coefficient of the second frequency band;and determining the reflection coefficient of each frequency point from the first frequency band to the second frequency band according to the first reflection coefficient and the second reflection coefficient.
- The method according to claim 7, wherein the determining the reflection coefficient of each frequency point from the first frequency band to the second frequency band according to the first reflection coefficient and the second reflection coefficient comprises:performing interpolation fitting processing on the first reflection coefficient and the second reflection coefficient to obtain a reflection coefficient model;and determining the reflection coefficient of each frequency point from the first frequency band to the second frequency band according to the reflection coefficient model.
- The method according to any one of claims 1-7, further comprising:filtering out at least one of the following signals in the frequency domain component signals within the at least one frequency band: the direct current signal is a component signal with image interference, and the signal intensity is smaller than the component signal with preset intensity.
- A reflectance measurement apparatus, characterized in that the apparatus comprises:the directional coupler is used for acquiring a transmission signal in a transmission frequency band;a processor configured to determine a frequency domain component signal of the transmission signal in at least one frequency band, where the at least one frequency band is a frequency band of the transmission frequency band having a bandwidth smaller than a bandwidth of the transmission frequency band, and the at least one frequency band includes a first frequency band;the processor is further configured to determine a first reflection coefficient of the first frequency band according to a frequency domain component signal corresponding to the transmission signal in the first frequency band.
- The apparatus of claim 10, wherein the processor is further configured to:converting the transmission signal into a frequency domain signal;and dividing the digital signal corresponding to the transmission signal into frequency domain component signals in at least one frequency band.
- The apparatus of claim 10, further comprising a time domain partitioning circuit;the time domain division circuit is used for determining a time domain component signal of the transmission signal in at least one frequency band;the processor is further configured to convert the time domain component signals in each of the at least one frequency band into frequency domain component signals in the frequency band.
- The apparatus of claim 12, wherein the time domain partitioning circuit comprises:at least one band-pass filter, configured to perform filtering processing on at least one frequency band on the transmission signal, respectively, so as to obtain a time domain component signal in the at least one frequency band; or,at least one frequency shifter, which is used for respectively carrying out frequency shift processing of at least one frequency band on the transmission signals; and the band-pass filter is used for performing filtering processing on the frequency-shifted signals in the same frequency band to correspondingly obtain time domain component signals in at least one frequency band.
- The apparatus of any of claims 10-13, wherein the transmission signal comprises a forward coupled signal and a reverse coupled signal, and wherein the processor is further configured to:and determining a first reflection coefficient of the first frequency band according to two frequency domain component signals corresponding to the forward coupling signal and the backward coupling signal in the first frequency band.
- The apparatus of any of claims 10-13, wherein the transmission signals comprise a forward transmission signal in forward coupling, a forward coupling signal, a forward transmission signal in reverse coupling, and a reverse coupling signal, and wherein the processor is further configured to:determining a first forward coupling coefficient according to a forward transmission signal during the forward coupling in the first frequency band and two frequency domain component signals corresponding to the forward coupling signal;determining a first reverse coupling coefficient according to a forward transmission signal during the reverse coupling in the first frequency band and two frequency domain component signals corresponding to the reverse coupling signal;and determining a first reflection coefficient of the first frequency band according to the first forward coupling coefficient and the first backward coupling coefficient.
- The apparatus of any of claims 10-15, wherein the at least one frequency band further comprises a second frequency band, and wherein the first frequency band is different from the second frequency band in frequency range, and wherein the processor is further configured to:determining a second reflection coefficient of the second frequency band;and determining the reflection coefficient of each frequency point from the first frequency band to the second frequency band according to the first reflection coefficient and the second reflection coefficient.
- The apparatus of claim 16, wherein the processor is further configured to:performing interpolation fitting processing on the first reflection coefficient and the second reflection coefficient to obtain a reflection coefficient model;and determining the reflection coefficient of each frequency point from the first frequency band to the second frequency band according to the reflection coefficient model.
- The apparatus according to any of claims 10-17, wherein the processor is further configured to:filtering out at least one of the following signals in the frequency domain component signals within the at least one frequency band: the direct current signal with interference exists, the component signal with image interference exists, and the signal intensity is smaller than the component signal with preset intensity.
- A reflection coefficient measuring apparatus, wherein the apparatus is a wireless communication device or a chip system applied to a wireless communication device, the apparatus comprises a processor and a memory, the memory stores instructions, and the processor executes the instructions in the memory to cause the apparatus to perform the reflection coefficient measuring method according to any one of claims 1 to 9.
- A readable storage medium having stored therein instructions which, when run on an apparatus, cause the apparatus to perform a reflection coefficient measurement method according to any one of claims 1-9.
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| JP2006266833A (en) * | 2005-03-23 | 2006-10-05 | Shinko Electric Ind Co Ltd | Method and apparatus for measuring characteristic impedance, and program for determining characteristic impedance |
| KR101305597B1 (en) * | 2011-08-08 | 2013-09-09 | 엘지이노텍 주식회사 | Impedance matching apparatus and method |
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