CN111313920B - Zero intermediate frequency receiver, signal processing method and device thereof, electronic device and medium - Google Patents
Zero intermediate frequency receiver, signal processing method and device thereof, electronic device and medium Download PDFInfo
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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Abstract
The invention provides a zero intermediate frequency receiver, a signal processing method, a signal processing device, electronic equipment and a medium thereof, wherein the zero intermediate frequency receiver comprises the following components: the device comprises a first channel, a second channel and a signal processing device; the first channel and the second channel are respectively used for carrying out frequency mixing processing on the input signals; the first channel and the second channel both comprise mixers, and the mixers in each channel share the same voltage-controlled oscillator; the signal processing apparatus is configured to: when the input end of the first channel is connected with an antenna and the input end of the second channel is connected with a first load, determining a compensation processing signal at the moment according to an output signal of the second channel at the moment, wherein the compensation processing signal is consistent with a local oscillator leakage signal in the output signal of the first channel at the moment; and acquiring a required target signal according to the compensation processing signal and the output signal of the first channel at the moment.
Description
Technical Field
The present invention relates to the field of signal processing of receivers, and in particular, to a zero intermediate frequency receiver, a signal processing method and apparatus thereof, an electronic device, and a medium.
Background
Zero intermediate frequency means that the signal is directly changed from RF to baseband without modulation and demodulation method of intermediate frequency. Correspondingly, the signal can be received and processed by a zero intermediate frequency receiver. The image rejection filter and the intermediate frequency filter can be omitted, so that the system is easy to integrate on a single chip, low in cost and low in power consumption, and the circuit modules, the number of external nodes and the opportunity that radio frequency signals are interfered by the outside required by the system can be reduced.
Because the local oscillator frequency of the zero intermediate frequency structure is the same as the signal frequency, when the isolation between the radio frequency port and the local oscillator port is insufficient, the local oscillator signal can be reflected back to the receiving channel through leaking to the antenna, and then a direct current signal is generated after frequency mixing, so that the direct current deviation is increased, and the local oscillator is leaked. When the original signal is mixed with the leaked local oscillator signal and the local oscillator leakage is large, the performance of the whole communication system is affected, such as the problems of increased error rate, communication interruption and the like.
Disclosure of Invention
The invention provides a zero intermediate frequency receiver, a signal processing method and device thereof, electronic equipment and a medium, and aims to solve the problem of local oscillator leakage.
According to a first aspect of the present invention, there is provided a zero intermediate frequency receiver comprising: the device comprises a first channel, a second channel and a signal processing device; the first channel and the second channel are respectively used for carrying out frequency mixing processing on the input signals; the first channel and the second channel both comprise mixers, and the mixers in each channel share the same voltage-controlled oscillator;
the signal processing apparatus is configured to:
when the input end of the first channel is connected with an antenna and the input end of the second channel is connected with a first load, determining a compensation processing signal at the moment according to an output signal of the second channel at the moment, wherein the compensation processing signal is consistent with a local oscillator leakage signal in the output signal of the first channel at the moment;
and acquiring a required target signal according to the compensation processing signal and the output signal of the first channel at the moment.
Optionally, the signal processing apparatus is further configured to:
when the input ends of the first channel and the second channel are connected with the same second load, determining a compensation parameter of a local oscillator leakage signal between the first channel and the second channel according to output signals of the first channel and the second channel at the moment; the compensation parameter is related to the difference of local oscillator leakage signals between two channels;
when determining the compensation processing signal at this time, the signal processing apparatus is specifically configured to:
and when the input end of the first channel is connected with an antenna and the input end of the second channel is connected with a second load, determining the compensation processing signal according to the compensation parameter and the output signal of the second channel at the moment.
Optionally, the compensation parameter is determined according to an amplitude of a first local oscillator signal and an amplitude of a second local oscillator signal when the input ends of the first channel and the second channel are connected to the second load, where the first local oscillator signal is generated by the mixer and the voltage-controlled oscillator in the first channel for the input signal of the first channel, and the second local oscillator signal is generated by the mixer and the voltage-controlled oscillator in the second channel for the input signal of the second channel.
Optionally, the first channel and the second channel both include a low-pass filter before frequency mixing, a low-pass filter after frequency mixing, and a low-noise amplifier, and the low-pass filter before frequency mixing, the low-noise amplifier, the frequency mixer, and the low-pass filter after frequency mixing in each channel are directly or indirectly connected in sequence.
Optionally, the compensation parameter k (t) is:
wherein:
a (t) is the amplitude of the first local oscillator signal when the input ends of the first channel and the second channel are connected with the same first load;
(t) is the amplitude of the second local oscillator signal when the input ends of the first channel and the second channel are connected with the same first load;
n1' (t) is noise in the first channel after the mixed low pass filter;
n2' (t) is the noise in the second channel after the mixed low pass filter.
Optionally, the target signal s (t) is:
S(t)＝r1(t)-fk(t)；
fk(t)＝r2(t)·k(t)；
wherein:
r1(t) the output signal of the first channel when the input end of the first channel is connected with an antenna and the input end of the second channel is connected with a second load;
r2and (t) the input end of the first channel is connected with an antenna, and the input end of the second channel is connected with an output signal of the second channel when the second load is connected.
Optionally, the first channel and the second channel each further include a variable gain amplifier connected to an output side of the mixed low-pass filter.
According to a second aspect of the present invention, there is provided a signal processing method for a zero intermediate frequency receiver, which is applied to a signal processing apparatus in the zero intermediate frequency receiver, and the zero intermediate frequency receiver further includes a first channel and a second channel; the first channel and the second channel are respectively used for performing frequency mixing processing on input signals, the first channel and the second channel both comprise mixers, and the mixers in each channel share the same voltage-controlled oscillator, and the signal processing method comprises the following steps:
when the input end of the first channel is connected with an antenna and the input end of the second channel is connected with a first load, determining a compensation processing signal at the moment according to an output signal of the second channel at the moment, wherein the compensation processing signal is consistent with a local oscillator leakage signal in the output signal of the first channel at the moment;
and acquiring a required target signal according to the compensation processing signal and the output signal of the first channel at the moment.
Optionally, the signal processing method further includes:
when the input ends of the first channel and the second channel are connected with the same second load, determining a compensation parameter of a local oscillator leakage signal between the first channel and the second channel according to output signals of the first channel and the second channel at the moment; the compensation parameter is related to the difference of local oscillator leakage signals between two channels;
determining the compensation processing signal at this time specifically includes:
and when the input end of the first channel is connected with an antenna and the input end of the second channel is connected with a second load, determining a compensation processing signal according to the compensation parameter and the output signal of the second channel at the moment.
Optionally, the compensation parameter is determined according to an amplitude of a first local oscillator signal and an amplitude of a second local oscillator signal when the input ends of the first channel and the second channel are connected to the second load, where the first local oscillator signal is generated by the mixer and the voltage-controlled oscillator in the first channel for the input signal of the first channel, and the second local oscillator signal is generated by the mixer and the voltage-controlled oscillator in the second channel for the input signal of the second channel.
Optionally, the first channel and the second channel both include a low-pass filter before frequency mixing, a low-pass filter after frequency mixing, and a low-noise amplifier, and the low-pass filter before frequency mixing, the low-noise amplifier, the frequency mixer, and the low-pass filter after frequency mixing in each channel are directly or indirectly connected in sequence.
Optionally, the compensation parameter k (t) is:
wherein:
a (t) is the amplitude of the first local oscillator signal when the input ends of the first channel and the second channel are connected with the same first load;
(t) is the amplitude of the second local oscillator signal when the input ends of the first channel and the second channel are connected with the same first load;
n1' (t) is noise in the first channel after the mixed low pass filter;
n2' (t) is the noise in the second channel after the mixed low pass filter.
Optionally, the target signal s (t) is:
S(t)＝r1(t)-fk(t)；
fk(t)＝r2(t)·k(t)；
wherein:
r1(t) the output signal of the first channel when the input end of the first channel is connected with an antenna and the input end of the second channel is connected with a second load;
r2and (t) the input end of the first channel is connected with an antenna, and the input end of the second channel is connected with an output signal of the second channel when the second load is connected.
According to a third aspect of the present invention, there is provided a signal processing apparatus of a zero intermediate frequency receiver, the zero intermediate frequency receiver further comprising a first channel and a second channel; the first channel and the second channel are respectively used for performing frequency mixing processing on input signals, the first channel and the second channel both include mixers, the mixers in each channel share the same voltage-controlled oscillator, and the signal processing apparatus includes:
the signal receiving and processing module is configured to determine a compensation processing signal at the time according to an output signal of the second channel at the time when the input end of the first channel is connected to an antenna and the input end of the second channel is connected to a first load, where the compensation processing signal is consistent with a local oscillator leakage signal in the output signal of the first channel;
and the target signal acquisition module is used for acquiring a required target signal according to the compensation processing signal and the output signal of the first channel at the moment.
Optionally, the signal processing apparatus further includes:
a compensation parameter obtaining module, configured to determine, when a same second load is connected to input ends of the first channel and the second channel, a compensation parameter of a local oscillator leakage signal between the first channel and the second channel according to output signals of the first channel and the second channel at the time; the compensation parameter is related to the difference of local oscillator leakage signals between two channels;
the signal receiving and processing module is specifically configured to determine the compensation processing signal according to the compensation parameter and the output signal of the second channel when the input end of the first channel is connected to an antenna and the input end of the second channel is connected to a second load.
Optionally, the compensation parameter is determined according to an amplitude of a first local oscillator signal and an amplitude of a second local oscillator signal when the input ends of the first channel and the second channel are connected to the second load, where the first local oscillator signal is generated by the mixer and the voltage-controlled oscillator in the first channel for the input signal of the first channel, and the second local oscillator signal is generated by the mixer and the voltage-controlled oscillator in the second channel for the input signal of the second channel.
Optionally, the first channel and the second channel both include a low-pass filter before frequency mixing, a low-pass filter after frequency mixing, and a low-noise amplifier, and the low-pass filter before frequency mixing, the low-noise amplifier, the frequency mixer, and the low-pass filter after frequency mixing in each channel are directly or indirectly connected in sequence.
Optionally, the compensation parameter k (t) is:
wherein:
a (t) is the amplitude of the first local oscillator signal when the input ends of the first channel and the second channel are connected with the same first load;
(t) is the amplitude of the second local oscillator signal when the input ends of the first channel and the second channel are connected with the same first load;
n1' (t) is noise in the first channel after the mixed low pass filter;
n2' (t) is the noise in the second channel after the mixed low pass filter.
Optionally, the target signal s (t) is:
S(t)＝r1(t)-fk(t)；
fk(t)＝r2(t)·k(t)；
wherein:
r1(t) is of the first channelThe input end of the second channel is connected with an antenna, and the input end of the second channel is connected with the output signal of the first channel when the second channel is connected with a second load;
r2and (t) the input end of the first channel is connected with an antenna, and the input end of the second channel is connected with an output signal of the second channel when the second load is connected.
According to a fourth aspect of the present invention, there is provided an electronic device, comprising a processor and a memory,
the memory is used for storing codes and related data;
the processor is configured to execute the codes in the memory to implement the signal processing method according to the second aspect and its optional aspects.
According to a fifth aspect of the present invention, there is provided a storage medium having stored thereon a computer program which, when executed by a processor, implements the signal processing method relating to the second aspect and its alternatives.
In the zero intermediate frequency receiver, the signal processing method and device thereof, the electronic equipment and the medium, when the first channel is connected with the antenna and the second channel is connected with the load, the compensation processing signal consistent with the local oscillation leakage in the first channel can be determined according to the output signal of the second channel, so that the signals received by the two channels are mutually offset, further, the local oscillation leakage can be accurately eliminated, and a more complete target signal is obtained.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a first schematic diagram of a zero intermediate frequency receiver according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a zero intermediate frequency receiver according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the first and second channels according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a configuration of a zero intermediate frequency receiver according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a zero intermediate frequency receiver according to an embodiment of the present invention;
fig. 6 is a first flowchart illustrating a signal processing method of a zero intermediate frequency receiver according to an embodiment of the present invention;
fig. 7 is a second flowchart illustrating a signal processing method of a zero intermediate frequency receiver according to an embodiment of the present invention;
fig. 8 is a first schematic diagram of program modules of a signal processing apparatus of a zero intermediate frequency receiver according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a second program module of a signal processing apparatus of a zero intermediate frequency receiver according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of an electronic device in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 1 is a first schematic diagram of a zero intermediate frequency receiver according to an embodiment of the present invention; fig. 2 is a schematic diagram of a zero intermediate frequency receiver according to an embodiment of the present invention; FIG. 3 is a schematic diagram of the first and second channels according to an embodiment of the present invention; fig. 4 is a schematic diagram of a configuration of a zero intermediate frequency receiver according to an embodiment of the present invention; fig. 5 is a schematic diagram of a zero intermediate frequency receiver according to an embodiment of the present invention.
Referring to fig. 1, the zero if receiver includes: a first channel 101, a second channel 102 and a signal processing device 103. The signal processing device 103 can be connected to the output ends of the first channel 101 and the second channel 102, and further can obtain the output signals.
The first channel 101 and the second channel 102 are respectively used for performing frequency mixing processing on input signals, and therefore, the first channel and the second channel both include mixers, and the mixers in each channel share the same voltage-controlled oscillator; in addition to the mixing process, other processes such as filtering and amplification may be performed, and whether or not other processes are performed does not depart from the description of the present embodiment.
In this embodiment, the processing procedures performed by different channels and the specific details in the processing procedures may be the same, and further, the circuit configurations of the first channel 101 and the second channel 102 may be the same.
Referring to fig. 1, the signal processing apparatus 103 is configured to:
when the input end of the first channel 101 is connected with an antenna 104 and the input end of the second channel 102 is connected with a first load 105, determining a compensation processing signal at the moment according to an output signal of the second channel 102 at the moment, wherein the compensation processing signal is consistent with a local oscillator leakage signal in the output signal of the first channel 101 at the moment;
and acquiring a required target signal according to the compensation processing signal and the output signal of the first channel 101 at the moment.
The frequency of the output signal of the mixer can be determined according to the frequency of the input signal of the channel and the frequency of the output signal of the voltage-controlled oscillator. The mixer can also down-convert the signal. Taking fig. 3 as an example, the mixer in the first channel 101 may be characterized as a mixer 1011, and the mixer in the second channel 102 may be characterized as a mixer 1021.
The voltage controlled oscillator 107 may also be characterized as a VCO, specifically: the output frequency of the voltage-controlled oscillator corresponds to the input control voltage, and the frequency of the output signal can be adjusted by controlling the input control voltage. As long as the mixers receive signals of the same frequency output by the same voltage controlled oscillator 107, the description of the present embodiment is not deviated.
Because the mixers of the two channels share the same voltage-controlled oscillator 107, the received signals of the two channels have certain correlation. If one end of one channel is connected with a load, and one end of the other channel is connected with an antenna to receive signals, the signals of one channel can be conveniently used for eliminating local oscillator leakage signals existing in the signals of the other channel by utilizing the correlation of the local oscillator signals.
Therefore, in the above embodiment, the signals received by the two channels are mutually offset, so that local oscillator leakage can be accurately eliminated, and a relatively complete target signal is obtained.
However, even if two channels use the same device, the two channels may not be completely equal to each other, for example: some slight differences in the circuitry may cause at least one of the amplitude, phase, etc. of the local oscillator signals in the two channels to differ.
Therefore, in one implementation, the present embodiment further introduces a compensation parameter, and the compensation parameter is used to enable the local oscillation signals of the two channels to be synchronized.
Referring to fig. 2, in one embodiment, the signal processing apparatus 103 is further configured to:
when the input ends of the first channel 101 and the second channel 102 are connected to the same second load 106, determining a compensation parameter of a local oscillator leakage signal between the first channel 101 and the second channel 102 according to output signals of the first channel 101 and the second channel 102 at the moment; the compensation parameter is associated with a difference in local oscillator leakage signals between the two channels.
Furthermore, the compensation parameters can be used for conveniently eliminating the difference of local oscillation signals caused by slight difference on a circuit.
The two second loads 106 depicted therein may be the same two loads or the same load, the second loads 106 may be the same load as the first load 105, the first load 105 and the second load 106 may be the same load, or the first load 105 and the second load 106 may be different loads. In any way, the description of the present embodiment is not deviated from.
When determining the compensation processing signal at this time, the signal processing apparatus 103 is specifically configured to:
when the input end of the first channel 101 is connected to an antenna and the input end of the second channel 102 is connected to a second load 106, the compensation processing signal is determined according to the compensation parameter and the output signal of the second channel at this time.
It can be seen that, in the specific implementation process, the input end of the first channel 101 may be connected to an antenna or a load, and may be switched to connect the antenna or the load in a manual control manner, or may be automatically controlled to connect the antenna or the load by using the signal processing module, for example, a switch may be connected to the input end of the first channel 101, and the switch may connect the antenna and the corresponding load, and further, by controlling the conduction condition of the switch, the connection relationship shown in fig. 1 may be implemented, and the connection relationship shown in fig. 2 may also be implemented. Similarly, if the first load 105 and the second load 106 are different loads, the second channel 102 may also be switched in a similar manner.
In a specific implementation process, the compensation parameter is determined according to an amplitude of a first local oscillator signal and an amplitude of a second local oscillator signal when the input ends of the first channel 101 and the second channel 102 are connected to the second load 106, where:
the first local oscillator signal is generated by the mixer and the voltage-controlled oscillator in the first channel for the input signal of the first channel, and the second local oscillator signal is generated by the mixer and the voltage-controlled oscillator in the second channel for the input signal of the second channel.
In a specific implementation process, referring to fig. 3 to fig. 5, the first channel 101 and the second channel 102 each include a mixing front low-pass filter, a mixing rear low-pass filter, and a low-noise amplifier, and the mixing front low-pass filter, the low-noise amplifier, the mixer, and the mixing rear low-pass filter in each channel are sequentially connected directly or indirectly.
Specifically, the method comprises the following steps:
the devices in the first channel 101 may be characterized as a pre-mixing low-pass filter 1012, a low-noise amplifier 1013, a mixer 1011, a post-mixing low-pass filter 1014, and furthermore, a variable gain amplifier 1015 may be connected to the output side of the post-mixing low-pass filter 1014;
the devices in the second channel 102 may be characterized as a pre-mixing low pass filter 1022, a low noise amplifier 1023, a mixer 1021, a post-mixing low pass filter 1024, and a variable gain amplifier 1025 may be connected to the output side of the post-mixing low pass filter 1024.
The pre-mixing Low pass filter and the post-mixing Low pass filter may be characterized as an LPF, specifically a Low-pass filter, which may allow signals below a cut-off frequency to pass through but may not allow signals above the cut-off frequency to pass through, so as to filter transmitted signals. Since a pre-mixing low pass filter can be used to connect the antenna, it can also be characterized as an RF LPF.
In one example, the low-pass filter can be a low-pass narrow-band filter,
in a specific example, taking fig. 2 and fig. 5 as an example, when the input end of the first channel 101 and the input end of the second channel 102 are both connected to the second load 106, then:
when the load is working, the signals received by the first channel 101 and processed by the pre-mixing low-pass filter 1012 and the low-noise amplifier 1013 may be: a (t) c (t) + n1(t)；
During the operation of the load, the signals received by the second channel 102 and processed by the low pass filter 1012 and the low noise amplifier 1023 may be: b (t) c (t) + n2(t)；
Wherein:
a (t) is the amplitude of the first local oscillator signal when the input ends of the first channel and the second channel are connected with the same first load;
(t) is the amplitude of the second local oscillator signal when the input ends of the first channel and the second channel are connected with the same first load;
after being processed by the mixer 1011 of the first channel 101, the resulting signal may be: a (t) + n1(t)；
After being processed by the mixer 1021 of the second channel 102, the resulting signal may be: b (t) + n2(t)；
After being processed by the low pass filter 1014 after mixing of the first channel 101, the resulting signal may be a (t) + n1′(t)；
After being processed by the low pass filter 1024 after mixing of the first channel 102, the obtained signal may be b (t) + n2′(t)；
Wherein:
n1' (t) is noise in the first channel after the mixed low pass filter;
n2' (t) is the noise in the second channel after the mixed low pass filter.
For the signal processed by the mixing low-pass filter, the division of the two signals can obtain the required compensation parameter k (t), that is: the compensation parameter k (t) is:
in a specific example, taking fig. 1 and fig. 4 as an example, when the input end of the first channel 101 is connected to the antenna 104, and the input end of the second channel 102 is connected to the first load 105, then:
the signal obtained by the first channel 101 after being processed by the low noise amplifier 1013 includes the target signal s (t) to be finally obtained, the gain of the local oscillator signal c (t) generated in the first channel 101 (i.e. a (t) mentioned above), and the noise generated by the low pass filter (which may also use n)1(t) characterization);
correspondingly, in the first channel 101, the signal obtained after being processed by the low-pass filter 1014 after being mixed is: r is1(t)＝S(t)+a(t)+n′1(t)；
After the input end of the first channel 101 is connected with the antenna 104 and the input end of the second channel 102 is connected with the first load 105, the second channel 102 can be kept open during the signal receiving process;
correspondingly, in the second channel 102, the signals obtained after the mixing and low-pass filter 1024 processing are: r is2(t)＝b(t)+n2′(t)。
Further, based on the above compensation parameter k (t), correspondingly, the compensation parameter may be multiplied by r2(t) obtaining the required compensation processing signal, namely: f. ofk(t)＝r2(t)·k(t)＝[b(t)+n2′(t)]·k(t)；
Therefore, the target signal s (t) is specifically: s (t) ═ r1(t)-fk(t)；
Wherein:
r1(t) may be understood as the output signal of the first channel when the input of the first channel is connected to an antenna and the input of the second channel is connected to a second load;
r2(t) may beIt is understood that the input end of the first channel is connected with an antenna, and the input end of the second channel is connected with the output signal of the second channel when a second load is connected.
It can also be seen that in the above process, n1' (t) and n2' (t) is the noise after the low-pass narrow-band filter, and can be ignored.
To sum up, in the zero intermediate frequency receiver provided by this embodiment, when the antenna is connected to the first channel and the load is connected to the second channel, the compensation processing signal consistent with the local oscillation leakage in the first channel can be determined according to the output signal of the second channel, so that the signals received by the two channels are mutually offset, and then the local oscillation leakage can be accurately eliminated, and a complete target signal is obtained.
Fig. 6 is a first flowchart illustrating a signal processing method of a zero intermediate frequency receiver according to an embodiment of the present invention; fig. 7 is a flowchart illustrating a signal processing method of a zero intermediate frequency receiver according to an embodiment of the present invention.
Referring to fig. 6 and fig. 7, the signal processing method of the zero-if receiver is applied to the signal processing apparatus in the zero-if receiver mentioned above, and therefore, the above description of the processing procedure of the signal processing apparatus can be understood as the processing procedure of the method according to the embodiment.
Referring to fig. 6, the signal processing method includes:
s201: when the input end of the first channel is connected with an antenna and the input end of the second channel is connected with a first load, determining a compensation processing signal at the moment according to an output signal of the second channel at the moment, wherein the compensation processing signal is consistent with a local oscillator leakage signal in the output signal of the first channel at the moment;
s202: and acquiring a required target signal according to the compensation processing signal and the output signal of the first channel at the moment.
Optionally, referring to fig. 7, the signal processing method further includes:
s203: when the input ends of the first channel and the second channel are connected with the same second load, determining a compensation parameter of a local oscillator leakage signal between the first channel and the second channel according to output signals of the first channel and the second channel at the moment; the compensation parameter is related to the difference of local oscillator leakage signals between two channels;
correspondingly, step S201 specifically includes:
s2011: and when the input end of the first channel is connected with an antenna and the input end of the second channel is connected with a second load, determining a compensation processing signal according to the compensation parameter and the output signal of the second channel at the moment.
Optionally, the compensation parameter is determined according to an amplitude of a first local oscillator signal and an amplitude of a second local oscillator signal when the input ends of the first channel and the second channel are connected to the second load, where the first local oscillator signal is generated by the mixer and the voltage-controlled oscillator in the first channel for the input signal of the first channel, and the second local oscillator signal is generated by the mixer and the voltage-controlled oscillator in the second channel for the input signal of the second channel.
Optionally, the first channel and the second channel both include a low-pass filter before frequency mixing, a low-pass filter after frequency mixing, and a low-noise amplifier, and the low-pass filter before frequency mixing, the low-noise amplifier, the frequency mixer, and the low-pass filter after frequency mixing in each channel are directly or indirectly connected in sequence.
Optionally, the compensation parameter k (t) is:
wherein:
a (t) is the amplitude of the first local oscillator signal when the input ends of the first channel and the second channel are connected with the same first load;
(t) is the amplitude of the second local oscillator signal when the input ends of the first channel and the second channel are connected with the same first load;
n1′(t)noise in the first channel after the mixed low-pass filter;
n2' (t) is the noise in the second channel after the mixed low pass filter.
Optionally, the target signal s (t) is:
S(t)＝r1(t)-fk(t)；
fk(t)＝r2(t)·k(t)；
wherein:
r1(t) the output signal of the first channel when the input end of the first channel is connected with an antenna and the input end of the second channel is connected with a second load;
r2and (t) the input end of the first channel is connected with an antenna, and the input end of the second channel is connected with an output signal of the second channel when the second load is connected.
Alternative embodiments, technical effects and technical terms of the above processing procedures can be understood with reference to the embodiments shown in fig. 1 to 5, and therefore, the description thereof will not be repeated here.
To sum up, in the signal processing method of the zero intermediate frequency receiver provided in this embodiment, when the first channel is connected to the antenna and the second channel is connected to the load, the compensation processing signal consistent with the local oscillation leakage in the first channel may be determined according to the output signal of the second channel, so that the signals received by the two channels are cancelled out, and further, the local oscillation leakage may be accurately eliminated, and a complete target signal is obtained.
Fig. 8 is a first schematic diagram of program modules of a signal processing apparatus of a zero intermediate frequency receiver according to an embodiment of the present invention; fig. 9 is a schematic diagram of a second program module of the signal processing apparatus of the zero intermediate frequency receiver according to an embodiment of the present invention.
The zero intermediate frequency receiver can be understood with reference to the related description above.
a signal receiving processing module 301, configured to determine, when an input end of the first channel is connected to an antenna and an input end of the second channel is connected to a first load, a compensation processing signal at this time according to an output signal of the second channel at this time, where the compensation processing signal is consistent with a local oscillator leakage signal in the output signal of the first channel;
a target signal obtaining module 302, configured to obtain a required target signal according to the compensation processing signal and the output signal of the first channel at this time.
Optionally, referring to fig. 9, the signal processing apparatus further includes:
a compensation parameter obtaining module 303, configured to determine, when the input ends of the first channel and the second channel are connected to a same second load, a compensation parameter of a local oscillator leakage signal between the first channel and the second channel according to output signals of the first channel and the second channel at this time; the compensation parameter is related to the difference of local oscillator leakage signals between two channels;
the signal receiving and processing module is specifically configured to determine the compensation processing signal according to the compensation parameter and the output signal of the second channel when the input end of the first channel is connected to an antenna and the input end of the second channel is connected to a second load.
Optionally, the compensation parameter is determined according to an amplitude of a first local oscillator signal and an amplitude of a second local oscillator signal when the input ends of the first channel and the second channel are connected to the second load, where the first local oscillator signal is generated by the mixer and the voltage-controlled oscillator in the first channel for the input signal of the first channel, and the second local oscillator signal is generated by the mixer and the voltage-controlled oscillator in the second channel for the input signal of the second channel.
Optionally, the first channel and the second channel both include a low-pass filter before frequency mixing, a low-pass filter after frequency mixing, and a low-noise amplifier, and the low-pass filter before frequency mixing, the low-noise amplifier, the frequency mixer, and the low-pass filter after frequency mixing in each channel are directly or indirectly connected in sequence.
Optionally, the compensation parameter k (t) is:
wherein:
a (t) is the amplitude of the first local oscillator signal when the input ends of the first channel and the second channel are connected with the same first load;
(t) is the amplitude of the second local oscillator signal when the input ends of the first channel and the second channel are connected with the same first load;
n1' (t) is noise in the first channel after the mixed low pass filter;
n2' (t) is the noise in the second channel after the mixed low pass filter.
Optionally, the target signal s (t) is:
S(t)＝r1(t)-fk(t)；
fk(t)＝r2(t)·k(t)；
wherein:
r1(t) the output signal of the first channel when the input end of the first channel is connected with an antenna and the input end of the second channel is connected with a second load;
r2and (t) the input end of the first channel is connected with an antenna, and the input end of the second channel is connected with an output signal of the second channel when the second load is connected.
Alternative embodiments, technical effects and technical terms of the above processing procedures can be understood with reference to the embodiments shown in fig. 1 to 5, and therefore, the description thereof will not be repeated here.
To sum up, in the signal processing apparatus of the zero intermediate frequency receiver provided in this embodiment, when the first channel is connected to the antenna and the second channel is connected to the load, the compensation processing signal consistent with the local oscillation leakage in the first channel can be determined according to the output signal of the second channel, so that the signals received by the two channels are mutually offset, and further, the local oscillation leakage can be accurately eliminated, and a complete target signal is obtained.
Fig. 10 is a schematic structural diagram of an electronic device in an embodiment of the present invention.
Referring to fig. 10, an electronic device 40 is provided, including:
a processor 41; and the number of the first and second groups,
a memory 42 for storing executable instructions of the processor;
wherein the processor 41 is configured to perform the above-mentioned method via execution of the executable instructions.
The processor 41 is capable of communicating with the memory 42 via the bus 43.
The present embodiments also provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-mentioned method.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (18)
1. A zero intermediate frequency receiver, comprising: the device comprises a first channel, a second channel and a signal processing device; the first channel and the second channel are respectively used for carrying out frequency mixing processing on the input signals; the first channel and the second channel both comprise mixers, and the mixers in each channel share the same voltage-controlled oscillator;
the signal processing apparatus is configured to:
when the input end of the first channel is connected with an antenna and the input end of the second channel is connected with a first load, determining a compensation processing signal at the moment according to an output signal of the second channel at the moment, wherein the compensation processing signal is consistent with a local oscillator leakage signal in the output signal of the first channel at the moment;
acquiring a required target signal according to the compensation processing signal and the output signal of the first channel at the moment;
the signal processing apparatus is further configured to:
when the input ends of the first channel and the second channel are connected with the same second load, determining a compensation parameter of a local oscillator leakage signal between the first channel and the second channel according to output signals of the first channel and the second channel at the moment; the compensation parameter is related to the difference of local oscillator leakage signals between two channels;
when determining the compensation processing signal at this time, the signal processing apparatus is specifically configured to:
and when the input end of the first channel is connected with an antenna and the input end of the second channel is connected with a second load, determining the compensation processing signal according to the compensation parameter and the output signal of the second channel at the moment.
2. The zero intermediate frequency receiver according to claim 1, wherein the compensation parameter is determined according to an amplitude of a first local oscillator signal and an amplitude of a second local oscillator signal when the input terminals of the first channel and the second channel are connected to the second load, the first local oscillator signal being generated by the mixer and the voltage-controlled oscillator in the first channel for the input signal of the first channel, and the second local oscillator signal being generated by the mixer and the voltage-controlled oscillator in the second channel for the input signal of the second channel.
3. The zero intermediate frequency receiver according to claim 2, wherein the first channel and the second channel each comprise a pre-mixing low pass filter, a post-mixing low pass filter and a low noise amplifier, and the pre-mixing low pass filter, the low noise amplifier, the mixer and the post-mixing low pass filter in each channel are directly or indirectly connected in sequence.
4. A zero intermediate frequency receiver according to claim 3, characterized in that the compensation parameter k (t) is:
wherein:
a (t) is the amplitude of the first local oscillator signal when the input ends of the first channel and the second channel are connected with the same first load;
(t) is the amplitude of the second local oscillator signal when the input ends of the first channel and the second channel are connected with the same first load;
n1' (t) is noise in the first channel after the mixed low pass filter;
n2' (t) is the noise in the second channel after the mixed low pass filter.
5. A zero intermediate frequency receiver according to claim 4, characterized in that the target signal S (t) is:
S(t)＝r1(t)-fk(t)；
fk(t)＝r2(t)·k(t)；
wherein:
r1(t) the output signal of the first channel when the input end of the first channel is connected with an antenna and the input end of the second channel is connected with a second load;
r2(t) the input end of the first channel is connected with an antenna, and the input end of the second channel is connected with the second channelThe output signal of the second channel under two loads;
fk(t) is the compensation processing signal.
6. A zero IF receiver according to any of claims 3 to 5, wherein the first and second channels each further comprise a variable gain amplifier connected to the output side of the post-mixing low pass filter.
7. A signal processing method of a zero intermediate frequency receiver is applied to a signal processing device in the zero intermediate frequency receiver, and is characterized in that the zero intermediate frequency receiver also comprises a first channel and a second channel; the first channel and the second channel are respectively used for carrying out frequency mixing processing on input signals, the first channel and the second channel respectively comprise frequency mixers, and the frequency mixers in each channel share the same voltage-controlled oscillator;
the signal processing method comprises the following steps:
when the input end of the first channel is connected with an antenna and the input end of the second channel is connected with a first load, determining a compensation processing signal at the moment according to an output signal of the second channel at the moment, wherein the compensation processing signal is consistent with a local oscillator leakage signal in the output signal of the first channel at the moment;
acquiring a required target signal according to the compensation processing signal and the output signal of the first channel at the moment;
further comprising:
when the input ends of the first channel and the second channel are connected with the same second load, determining a compensation parameter of a local oscillator leakage signal between the first channel and the second channel according to output signals of the first channel and the second channel at the moment; the compensation parameter is related to the difference of local oscillator leakage signals between two channels;
determining a compensation processing signal according to the output signal of the second channel, specifically including:
and when the input end of the first channel is connected with an antenna and the input end of the second channel is connected with a second load, determining a compensation processing signal according to the compensation parameter and the output signal of the second channel at the moment.
8. The signal processing method according to claim 7, wherein the compensation parameter is determined according to an amplitude of a first local oscillator signal and an amplitude of a second local oscillator signal when the input terminals of the first channel and the second channel are connected to the second load, the first local oscillator signal is generated by the mixer and the voltage-controlled oscillator in the first channel for the input signal of the first channel, and the second local oscillator signal is generated by the mixer and the voltage-controlled oscillator in the second channel for the input signal of the second channel.
9. The signal processing method of claim 8, wherein the first channel and the second channel each comprise a pre-mixing low-pass filter, a post-mixing low-pass filter, and a low-noise amplifier, and the pre-mixing low-pass filter, the low-noise amplifier, the mixer, and the post-mixing low-pass filter in each channel are directly or indirectly connected in sequence.
10. The signal processing method of claim 9, wherein the compensation parameter k (t) is:
wherein:
a (t) is the amplitude of the first local oscillator signal when the input ends of the first channel and the second channel are connected with the same first load;
(t) is the amplitude of the second local oscillator signal when the input ends of the first channel and the second channel are connected with the same first load;
n1' (t) is noise in the first channel after the mixed low pass filter;
n2' (t) is the noise in the second channel after the mixed low pass filter.
11. The signal processing method of claim 10, wherein the target signal s (t) is:
S(t)＝r1(t)-fk(t)；
fk(t)＝r2(t)·k(t)；
wherein:
r1(t) the output signal of the first channel when the input end of the first channel is connected with an antenna and the input end of the second channel is connected with a second load;
r2(t) the input end of the first channel is connected with an antenna, and the input end of the second channel is connected with an output signal of the second channel when the second load is connected;
fk(t) is the compensation processing signal.
12. The signal processing device of the zero intermediate frequency receiver is characterized in that the zero intermediate frequency receiver also comprises a first channel and a second channel; the first channel and the second channel are respectively used for carrying out frequency mixing processing on input signals, the first channel and the second channel respectively comprise frequency mixers, and the frequency mixers in each channel share the same voltage-controlled oscillator;
the signal processing device comprises:
the signal receiving and processing module is configured to determine a compensation processing signal at the time according to an output signal of the second channel at the time when the input end of the first channel is connected to an antenna and the input end of the second channel is connected to a first load, where the compensation processing signal is consistent with a local oscillator leakage signal in the output signal of the first channel;
a target signal obtaining module, configured to obtain a required target signal according to the compensation processing signal and an output signal of the first channel at this time;
further comprising:
a compensation parameter obtaining module, configured to determine, when a same second load is connected to input ends of the first channel and the second channel, a compensation parameter of a local oscillator leakage signal between the first channel and the second channel according to output signals of the first channel and the second channel at the time; the compensation parameter is related to the difference of local oscillator leakage signals between two channels;
the signal receiving and processing module is specifically configured to determine the compensation processing signal according to the compensation parameter and the output signal of the second channel when the input end of the first channel is connected to an antenna and the input end of the second channel is connected to a second load.
13. The signal processing apparatus of claim 12, wherein the compensation parameter is determined according to an amplitude of a first local oscillator signal and an amplitude of a second local oscillator signal when the input terminals of the first channel and the second channel are connected to the second load, the first local oscillator signal is generated by the mixer and the voltage-controlled oscillator in the first channel for the input signal of the first channel, and the second local oscillator signal is generated by the mixer and the voltage-controlled oscillator in the second channel for the input signal of the second channel.
14. The signal processing apparatus of claim 13, wherein the first channel and the second channel each comprise a pre-mixing low pass filter, a post-mixing low pass filter, and a low noise amplifier, and the pre-mixing low pass filter, the low noise amplifier, the mixer, and the post-mixing low pass filter in each channel are directly or indirectly connected in sequence.
15. The signal processing apparatus of claim 14, wherein the compensation parameter k (t) is:
wherein:
a (t) is the amplitude of the first local oscillator signal when the input ends of the first channel and the second channel are connected with the same first load;
(t) is the amplitude of the second local oscillator signal when the input ends of the first channel and the second channel are connected with the same first load;
n1' (t) is noise in the first channel after the mixed low pass filter;
n2' (t) is the noise in the second channel after the mixed low pass filter.
16. The signal processing apparatus of claim 15, wherein the target signal s (t) is:
S(t)＝r1(t)-fk(t)；
fk(t)＝r2(t)·k(t)；
wherein:
r1(t) the output signal of the first channel when the input end of the first channel is connected with an antenna and the input end of the second channel is connected with a second load;
r2(t) the input end of the first channel is connected with an antenna, and the input end of the second channel is connected with an output signal of the second channel when the second load is connected;
fk(t) is the compensation processing signal.
17. An electronic device, comprising a processor and a memory,
the memory is used for storing codes and related data;
the processor, configured to execute the codes in the memory to implement the signal processing method according to any one of claims 7 to 11.
18. A storage medium having stored thereon a computer program which, when executed by a processor, implements the signal processing method of any one of claims 7 to 11.
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