CN117768046A - DC control word adjusting method, interference eliminating method, chip and equipment - Google Patents
DC control word adjusting method, interference eliminating method, chip and equipment Download PDFInfo
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Abstract
The invention provides a method for eliminating baseband direct current interference of a receiving path of a radio frequency chip, which comprises the following steps: setting the frequency point of the radio frequency chip as a target frequency point, and adjusting the automatic gain control to a target gear; controlling the radio frequency chip to receive an air interface noise signal; and adjusting the direct current control word of the digital baseband according to the current energy of the air interface noise signal. The direct current control word adjusting method, the interference eliminating method, the chip and the device provided by the invention can effectively acquire the direct current interference of the whole receiving channel.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a method for adjusting a direct current control word, an interference cancellation method, a chip, and a device.
Background
In modern wireless communication, when a user equipment is in a standby or connected state to receive signals, due to the design of a radio frequency chip, direct current interference is always generated when the signals are received, so that the received signals have larger local oscillation interference, cell signals cannot be accurately measured, and demodulation and reception sensitivity is poor. In the prior art, when the automatic test equipment calibrates the radio frequency chip, the direct current interference of one or two devices in the radio frequency chip is calibrated, and when the user equipment is in a standby or connected state, the calibration result of the automatic test equipment calibration is taken as compensation to eliminate the direct current interference.
Because the calibration platform of the automatic test equipment is used for detaching and calibrating each device of the radio frequency chip, based on the limitation of the calibration platform of the automatic test equipment, only the direct current interference of one two devices in the radio frequency chip can be obtained when the two devices work independently, and the direct current interference of the whole downlink link of the radio frequency chip can not be obtained, and the direct current interference estimation is inaccurate.
Disclosure of Invention
The direct current control word adjusting method, the interference eliminating method, the chip and the device provided by the invention can effectively acquire the direct current interference of the whole receiving channel.
The invention provides a method for adjusting a baseband direct current control word of a receiving path of a radio frequency chip, which comprises the following steps:
setting the frequency point of the radio frequency chip as a target frequency point, and adjusting the automatic gain control to a target gear;
controlling the radio frequency chip to receive an air interface noise signal;
and adjusting the direct current control word of the digital baseband according to the current energy of the air interface noise signal.
Optionally, setting the frequency point of the radio frequency chip as the target frequency point, and adjusting the automatic gain control to the target gear includes:
and setting the frequency point of the radio frequency chip as the central frequency point of the frequency band to be calibrated, and adjusting the automatic gain control to the maximum gear.
Optionally, the adjusting the dc control word of the digital baseband according to the current energy of the air interface noise signal includes:
judging whether the current energy is in a convergence state according to a dichotomy;
and when the current energy is in an unconverged state, updating the boundary of the direct current control word according to a dichotomy, and re-executing the step of controlling the radio frequency chip to receive the air interface noise signal after re-selecting the direct current control word in the updated boundary.
Optionally, the adjusting the dc control word of the digital baseband according to the current energy of the air interface noise signal includes:
acquiring corresponding relations between the I-path signal and the Q-path signal and between a first direct current control word and a second direct current control word in the direct current control words;
and adjusting the first direct current control word and the second direct current control word according to the current energy of the I-path signal and the current energy of the Q-path signal.
Optionally, the adjusting the first dc control word and the second dc control word according to the current energy of the I-path signal and the current energy of the Q-path signal includes:
judging whether the current energy of one path of signal corresponding to the first direct current control word is in a convergence state or not according to a dichotomy;
and when the current energy of one path of signal corresponding to the first direct current control word is in an unconverged state, keeping the second direct current control word unchanged, updating the boundary of the first direct current control word according to a dichotomy, and re-executing the step of controlling the radio frequency chip to receive the air interface noise signal after re-selecting the first direct current control word in the updated boundary.
Optionally, the adjusting the dc control word of the digital baseband according to the current energy of the air interface noise signal includes:
and when the current energy of one path of signal corresponding to the first direct current control word is in a convergence state, keeping the first direct current control word unchanged, and adjusting the second direct current control word of the digital baseband.
Optionally, adjusting the second dc control word of the digital baseband includes:
judging whether the current energy of one path of signal corresponding to the second direct current control word is in a convergence state or not according to a dichotomy;
and when the current energy of one path of signal corresponding to the second direct current control word is in an unconverged state, keeping the first direct current control word unchanged, updating the boundary of the second direct current control word according to a dichotomy, and re-executing the step of controlling the radio frequency chip to receive the air interface noise signal after re-selecting the second direct current control word in the updated boundary.
Optionally, the adjusting the dc control word of the digital baseband according to the current energy of the air interface noise signal includes:
and when the current energy is in a convergence state, maintaining the direct current control word and the frequency point unchanged, and traversing the gear of the automatic gain control to calculate the direct current interference residual value of the corresponding gear of the automatic gain control relative to the target gear of the target frequency point.
Optionally, the adjusting the dc control word of the digital baseband according to the current energy of the air interface noise signal includes:
and when the current energy is in a convergence state, maintaining the direct current control word and the gear of the automatic gain control unchanged, and traversing the frequency points to calculate the direct current interference residual value of the corresponding frequency points relative to the target gear of the target frequency points.
Optionally, the traversing the frequency points includes:
and traversing the frequency points in the frequency band range to be calibrated.
In a second aspect, the present invention provides a method for eliminating baseband dc interference of a receiving path of a radio frequency chip, which is characterized in that the method includes:
acquiring the direct current control word adjusted by the method for adjusting the baseband direct current control word of the receiving path of the radio frequency chip;
the direct current control word is applied to a receive path to cancel the receive path baseband direct current interference.
In a third aspect, the present invention provides a chip comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the radio frequency chip receive path baseband direct current interference cancellation method as set forth in any one of the preceding claims.
In a fourth aspect, the present invention provides a terminal device, including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the radio frequency chip receive path baseband direct current interference cancellation method as set forth in any one of the preceding claims.
In the technical scheme provided by the invention, after the frequency point and the automatic gain control gear of the radio frequency chip are set, the actual signal is not received, only the air interface noise signal is received, and then the energy of the air interface noise signal is used for adjusting the direct current control word of the baseband, so that the direct current interference of the whole link under the target frequency point and the target gear can be eliminated.
Drawings
FIG. 1 is a flowchart of a method for adjusting a baseband DC control word of a receiving path of a RF chip according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for adjusting a baseband DC control word of a receiving path of a RF chip according to an embodiment of the invention, in which the current energy is not in a convergence state;
FIG. 3 is a flowchart of a method for adjusting a baseband DC control word of a receiving channel of a radio frequency chip according to an embodiment of the present invention;
FIG. 4 is a flowchart of a method for adjusting a baseband DC control word of a receiving path of a radio frequency chip according to an embodiment of the present invention, wherein the energy of a signal corresponding to a first DC control word is not in a convergence state;
FIG. 5 is a flow chart showing a method for adjusting a baseband DC control word of a receiving path of a radio frequency chip according to an embodiment of the present invention, wherein energy of a signal corresponding to a first DC control word is in a converged state;
FIG. 6 is a flowchart of a method for adjusting a baseband DC control word of a receiving path of a radio frequency chip according to an embodiment of the present invention, where energy of a signal corresponding to a second DC control word is not in a converged state;
FIG. 7 is a flowchart of a method for adjusting a baseband DC control word of a receiving path of a RF chip to calculate DC interference residuals of a plurality of gears according to an embodiment of the present invention;
fig. 8 is a flowchart of calculating interference residuals of a plurality of frequency point branches according to a method for adjusting a baseband dc control word of a receiving path of a radio frequency chip according to an embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides a method for adjusting a baseband direct current control word of a receiving path of a radio frequency chip, as shown in fig. 1, comprising the following steps:
step 100, setting a frequency point of a radio frequency chip as a target frequency point, and adjusting automatic gain control to a target gear;
in some embodiments, the target frequency point and the target gear may be selected according to requirements, for example, a center frequency point of a frequency band to be calibrated may be selected as the target frequency point, and a maximum gear of automatic gain control adjustment may be selected as the target gear. For the target frequency point and the target gear, the direct current control word after the direct current interference is eliminated is used as a reference to estimate the direct current residue of the combination of each gear and the frequency point.
Step 200, controlling the radio frequency chip to receive an air interface noise signal;
in some embodiments, the radio frequency chip does not receive any actual signal, and only receives the air interface noise signal, so that during the adjustment process, the noise signal is processed independently of any signal, and the direct current control word can be adjusted more accurately.
Step 300, adjusting the direct current control word of the digital baseband according to the current energy of the air interface noise signal.
In some embodiments, the adjustment of the dc control word will have a direct effect on the energy of the air interface noise signal, and in this embodiment, the energy of the air interface noise signal is made to approach zero by adjusting the dc control word, so that the dc interference at the target frequency point and the target gear is eliminated.
In the technical scheme provided by the embodiment of the invention, after the frequency point and the automatic gain control gear of the radio frequency chip are set, the actual signal is not received, only the air interface noise signal is received, and then the energy of the air interface noise signal is used for adjusting the direct current control word of the baseband, so that the direct current interference of the whole link under the target frequency point and the target gear can be eliminated.
As an optional implementation manner, in step 100, setting the frequency point of the radio frequency chip as the target frequency point, and adjusting the automatic gain control to the target gear includes:
and setting the frequency point of the radio frequency chip as the central frequency point of the frequency band to be calibrated, and adjusting the automatic gain control to the maximum gear.
In some embodiments, since the center frequency point of the frequency band to be calibrated is a frequency point with direct reflected direct current interference of the whole frequency band, the direct current interference is maximum when the automatic gain control is adjusted to the maximum gear, and therefore, the direct current interference can be eliminated greatly by adopting the center frequency point and the maximum gear.
As an alternative embodiment, as shown in fig. 2, in step 300, the adjusting the dc control word of the digital baseband according to the current energy of the air interface noise signal includes:
step 301, judging whether the current energy is in a convergence state according to a dichotomy;
in some embodiments, the dichotomy has a fast convergence property, and can accurately find a desired dc control word, so the dichotomy is used to find the dc control word in this embodiment.
Step 302, when the current energy is in an unconverged state, updating the boundary of the direct current control word according to the dichotomy, and re-executing the step of controlling the radio frequency chip to receive the air interface noise signal after re-selecting the direct current control word in the updated boundary.
In some embodiments, when the current energy is in an unconverged state, after updating the boundary of the dc control word, the dc control word is reselected in the updated boundary, and then the energy of the air interface noise is judged after receiving the air interface noise signal again, and after multiple iterations, the dc control word with the dc interference close to zero can be accurately found.
As an alternative embodiment, as shown in fig. 3, in step 300, the adjusting the dc control word of the digital baseband according to the current energy of the air interface noise signal includes:
step 303, obtaining the corresponding relation between the I-path signal and the Q-path signal and the first direct current control word and the second direct current control word in the direct current control word;
in some embodiments, the I-way signal may correspond to a first dc control word or a second dc control word. The Q-way signal corresponds to the second dc control word when the I-way signal corresponds to the first dc control word and the Q-way signal corresponds to the first dc control word when the I-way signal corresponds to the second dc control word.
Step 304, adjusting the first dc control word and the second dc control word according to the current energy of the I-path signal and the current energy of the Q-path signal.
In some embodiments, since the signals normally received by the rf chip are two signals including an I signal and a Q signal, in this embodiment, the current energy of the I signal and the current energy of the Q signal are respectively used to adjust the first dc control word and the second dc control word according to the correspondence, so that the dc interference of the I signal and the Q signal is close to zero.
As an alternative embodiment, as shown in fig. 4, in step 304, the adjusting the first dc control word and the second dc control word according to the current energy of the I-path signal and the current energy of the Q-path signal includes:
step 305, judging whether the current energy of a path of signal corresponding to the first direct current control word is in a convergence state according to a dichotomy;
in some embodiments, since the signals received by the rf chip are typically two signals of Q and I, in order to avoid mutual interference, one of the dc control words needs to be kept unchanged and the other dc control word needs to be changed during the adjustment of the dc control word. In this embodiment, first, the first dc control word is adjusted.
And 306, when the current energy of one path of signal corresponding to the first direct current control word is in an unconverged state, keeping the second direct current control word unchanged, updating the boundary of the first direct current control word according to a dichotomy, and re-executing the step of controlling the radio frequency chip to receive the air interface noise signal after re-selecting the first direct current control word in the updated boundary.
In some embodiments, when the current energy of a signal corresponding to the first dc control word is not in a convergence state, the second dc control word is kept unchanged, so as to avoid the influence of the change of the second dc control word on the adjustment of the first dc control word. And (3) performing multiple iterations on the function formed by the first direct current control word and the signal energy by using a dichotomy, and knowing that the current energy of one path of signal corresponding to the first direct current control word is close to zero.
As an alternative embodiment, as shown in fig. 5, in step 300, the adjusting the dc control word of the digital baseband according to the current energy of the air interface noise signal includes:
in step 307, when the current energy of the signal corresponding to the first dc control word is in a convergence state, the first dc control word is kept unchanged, and the second dc control word of the digital baseband is adjusted.
In some embodiments, when the current energy of a signal corresponding to the first dc control word is in a convergence state, the first dc control word is kept unchanged, and adjustment of the second dc control word is started, so that the influence of the change of the first dc control word on the adjustment of the second dc control word is avoided.
As an alternative embodiment, as shown in fig. 6, in step 307, adjusting the second dc control word of the digital baseband includes:
step 308, judging whether the current energy of a path of signal corresponding to the second direct current control word is in a convergence state according to a dichotomy;
in some embodiments, the adjustment process of the second dc control word is similar to the adjustment process of the first dc control word, and the dc control word is determined by a dichotomy method.
Step 309, when the current energy of a signal corresponding to the second dc control word is in an unconverged state, keeping the first dc control word unchanged, updating the boundary of the second dc control word according to the dichotomy, and re-executing the step of controlling the rf chip to receive the air interface noise signal after re-selecting the second dc control word in the updated boundary.
In some embodiments, the adjustment process of the second dc control word is similar to the adjustment process of the first dc control word, and a successive iteration update method is also adopted to continuously reduce the boundary of the dc control word until the current energy of a signal corresponding to the second dc control word is close to zero.
As an alternative embodiment, as shown in fig. 7, in step 300, the adjusting the dc control word of the digital baseband according to the current energy of the air interface noise signal includes:
step 310, when the current energy is in a convergence state, maintaining the direct current control word and the frequency point unchanged, and traversing the gear of the automatic gain control to calculate the direct current interference residual value of the corresponding gear of the automatic gain control relative to the target gear of the target frequency point.
In some embodiments, when the energy is in a convergence state, it indicates that the dc interference at the target frequency point and the target gear is close to zero, at this time, the dc control word is kept unchanged, the gear controlled by the automatic gain of the single frequency point is traversed, one gear is changed each time, and the energy of the air interface noise signal are received, so that the dc interference residual values of the changed gear relative to the target gear and the target frequency point are calculated, and the residual values are compensated.
As an alternative embodiment, as shown in fig. 8, in step 300, the adjusting the dc control word of the digital baseband according to the current energy of the air interface noise signal includes:
step 311, when the current energy is in a convergence state, maintaining the direct current control word and the gear of the automatic gain control unchanged, and traversing the frequency points to calculate the direct current interference residual value of the corresponding frequency point relative to the target gear of the target frequency point.
In some embodiments, when the energy is in a convergence state, it indicates that the dc interference in the target frequency point and the target gear is close to zero, at this time, the dc control word is kept unchanged, the frequency point is traversed, one frequency point is changed each time, the air interface noise signal is received, and the energy of the air interface noise signal is calculated, so that the dc interference residual value of the changed frequency point relative to the target gear and the target frequency point is calculated, and the residual value is compensated.
As an optional implementation manner, in step 311, the traversing the frequency points includes:
and traversing the frequency points in the frequency band range to be calibrated.
In some embodiments, the frequency points are traversed within the frequency band to be calibrated, so that the whole frequency band to be calibrated can be calibrated.
The embodiment of the invention also provides a method for eliminating the baseband direct current interference of the receiving path of the radio frequency chip, which is characterized by comprising the following steps:
acquiring the direct current control word adjusted by the method for adjusting the baseband direct current control word of the receiving path of the radio frequency chip;
the direct current control word is applied to a receive path to cancel the receive path baseband direct current interference.
The embodiment of the invention also provides a chip, which comprises:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the radio frequency chip receive path baseband direct current interference cancellation method as set forth in any one of the preceding claims.
The embodiment of the invention also provides a terminal device, which comprises:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the radio frequency chip receive path baseband direct current interference cancellation method as set forth in any one of the preceding claims.
Those skilled in the art will appreciate that implementing all or part of the above-described method embodiments may be accomplished by way of computer programs, which may be stored on a computer readable storage medium, which when executed may comprise the steps of the method embodiments described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), or the like.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (13)
1. The method for adjusting the baseband direct current control word of the receiving path of the radio frequency chip is characterized by comprising the following steps:
setting the frequency point of the radio frequency chip as a target frequency point, and adjusting the automatic gain control to a target gear;
controlling the radio frequency chip to receive an air interface noise signal;
and adjusting the direct current control word of the digital baseband according to the current energy of the air interface noise signal.
2. The method of claim 1, wherein setting the frequency point of the radio frequency chip as the target frequency point and adjusting the automatic gain control to the target gear comprises:
and setting the frequency point of the radio frequency chip as the central frequency point of the frequency band to be calibrated, and adjusting the automatic gain control to the maximum gear.
3. The method of claim 1, wherein said adjusting the dc control word of the digital baseband in accordance with the current energy of the air interface noise signal comprises:
judging whether the current energy is in a convergence state according to a dichotomy;
and when the current energy is in an unconverged state, updating the boundary of the direct current control word according to a dichotomy, and re-executing the step of controlling the radio frequency chip to receive the air interface noise signal after re-selecting the direct current control word in the updated boundary.
4. A method according to claim 3, wherein said adjusting the dc control word of the digital baseband in dependence on the current energy of the air interface noise signal comprises:
acquiring corresponding relations between the I-path signal and the Q-path signal and between a first direct current control word and a second direct current control word in the direct current control words;
and adjusting the first direct current control word and the second direct current control word according to the current energy of the I-path signal and the current energy of the Q-path signal.
5. The method of claim 4, wherein adjusting the first dc control word and the second dc control word based on the current energy of the I-way signal and the current energy of the Q-way signal comprises:
judging whether the current energy of one path of signal corresponding to the first direct current control word is in a convergence state or not according to a dichotomy;
and when the current energy of one path of signal corresponding to the first direct current control word is in an unconverged state, keeping the second direct current control word unchanged, updating the boundary of the first direct current control word according to a dichotomy, and re-executing the step of controlling the radio frequency chip to receive the air interface noise signal after re-selecting the first direct current control word in the updated boundary.
6. The method of claim 5, wherein adjusting the dc control word of the digital baseband based on the current energy of the air interface noise signal comprises:
and when the current energy of one path of signal corresponding to the first direct current control word is in a convergence state, keeping the first direct current control word unchanged, and adjusting the second direct current control word of the digital baseband.
7. The method of claim 6, wherein adjusting the second dc control word for the digital baseband comprises:
judging whether the current energy of one path of signal corresponding to the second direct current control word is in a convergence state or not according to a dichotomy;
and when the current energy of one path of signal corresponding to the second direct current control word is in an unconverged state, keeping the first direct current control word unchanged, updating the boundary of the second direct current control word according to a dichotomy, and re-executing the step of controlling the radio frequency chip to receive the air interface noise signal after re-selecting the second direct current control word in the updated boundary.
8. A method according to claim 3, wherein said adjusting the dc control word of the digital baseband in dependence on the current energy of the air interface noise signal comprises:
and when the current energy is in a convergence state, maintaining the direct current control word and the frequency point unchanged, and traversing the gear of the automatic gain control to calculate the direct current interference residual value of the corresponding gear of the automatic gain control relative to the target gear of the target frequency point.
9. A method according to claim 3, wherein said adjusting the dc control word of the digital baseband in dependence on the current energy of the air interface noise signal comprises:
and when the current energy is in a convergence state, maintaining the direct current control word and the gear of the automatic gain control unchanged, and traversing the frequency points to calculate the direct current interference residual value of the corresponding frequency points relative to the target gear of the target frequency points.
10. The method of claim 1, wherein traversing the bins comprises:
and traversing the frequency points in the frequency band range to be calibrated.
11. The method for eliminating the baseband direct current interference of the receiving path of the radio frequency chip is characterized by comprising the following steps:
obtaining a direct current control word adjusted by the method for adjusting the baseband direct current control word of the receiving path of the radio frequency chip according to any one of claims 1 to 10;
the direct current control word is applied to a receive path to cancel the receive path baseband direct current interference.
12. A chip, the chip comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the radio frequency chip receive path baseband direct current interference cancellation method of claim 11.
13. A terminal device, characterized in that the terminal device comprises:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the radio frequency chip receive path baseband direct current interference cancellation method of claim 11.
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