CN107026635B - Pulse signal shaping system and method - Google Patents
Pulse signal shaping system and method Download PDFInfo
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- CN107026635B CN107026635B CN201610072462.3A CN201610072462A CN107026635B CN 107026635 B CN107026635 B CN 107026635B CN 201610072462 A CN201610072462 A CN 201610072462A CN 107026635 B CN107026635 B CN 107026635B
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Abstract
The invention relates to a pulse signal shaping system, comprising: a first signal processor for receiving an initial pulse signal and spreading each frequency component of the initial pulse signal in a time domain; a second signal processor for generating a control signal and processing a frequency component on a time domain using the control signal to output a target frequency component; and a third signal processor for synthesizing the respective target frequency components spread in the time domain to output a pulse signal having a target waveform. In the pulse signal forming system, each frequency component of the initial pulse signal is firstly expanded on a time domain, and the frequency component on the time domain is processed by the control signal, so that a frequency component corresponding to a target waveform, namely a target frequency component, is obtained. And finally, synthesizing the obtained target frequency components to obtain a pulse signal with a target waveform, so that any waveform can be output according to the requirement. The invention also relates to a pulse signal shaping method.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a pulse signal shaping system and method.
Background
Conventional pulse shaping techniques are typically applied to baseband signal processing in communication systems. The waveform is a square pulse before the digital baseband signal is fed into the modulator. Since the rising edge and the falling edge of the rectangular pulse are abrupt, high frequency components are rich, the frequency domain occupies a wide frequency band, and when passing through a band-limited channel, the pulse of each symbol will spread into the symbols of adjacent symbols, causing inter-symbol interference (ISI) and leading to an increased probability of error when a receiver detects one symbol. A common method to reduce intersymbol interference is to increase the channel bandwidth. However, the wireless communication system requires a small occupied bandwidth under the condition of reducing intersymbol interference, and reduces the out-of-band radiation of modulation as much as possible, thereby improving the utilization rate of the frequency band. Conventional pulse shaping techniques therefore require pulse shaping filters to be designed to produce a waveform that is more suitable for channel transmission that both reduces inter-symbol interference and does not occupy too much extra bandwidth.
A pulse shaping filter based on pulse shaping technology is a digital filter commonly used in communication systems. Pulse shaping filters are commonly used in baseband communication transmissions to improve the spectral transmission efficiency of the signal. The shaping filter after D/a (digital/analog) conversion is typically designed as a FIR filter, converting the in-phase (I) and quadrature (Q) symbols of the signal into an analog I, Q signal. The traditional pulse shaping technology is limited by a digital processing technology, and can only work in a narrow frequency range to obtain a narrow-band shaped waveform. Moreover, the conventional pulse shaping technique is limited by a shaping filter, and is generally used for forming a single rectangular pulse, and cannot form any waveform.
Disclosure of Invention
Based on this, it is necessary to provide a pulse signal shaping system and method that can output an arbitrary waveform.
A pulse signal shaping system comprising: a first signal processor for receiving an initial pulse signal and spreading each frequency component of the initial pulse signal in a time domain; a second signal processor for generating a control signal and processing a frequency component on a time domain using the control signal to output a target frequency component; and a third signal processor for synthesizing the respective target frequency components spread in the time domain to output a pulse signal having a target waveform.
In one embodiment, the initial pulse signal is a high-speed pulse signal.
In one embodiment, the first signal processor and the third signal processor are both dispersive group delay devices; the dispersive group delay device is a dispersive group delay device with linear relation between group delay and frequency.
In one embodiment, the group delay response slopes of the first and third signal processors are equal in magnitude and opposite in sign.
In one embodiment, the control signal generated by the second signal processor is a narrowband signal.
In one embodiment, the second signal processor is configured to add, remove, enhance or attenuate frequency components using the control signal.
A method of pulse signal shaping, comprising: receiving an initial pulse signal; spreading each frequency component of the initial pulse signal on a time domain; generating a control signal and processing a frequency component on a time domain using the control signal to output a target frequency component; the respective target frequency components spread in the time domain are synthesized to output a pulse signal having a target waveform.
In one embodiment, in the step of spreading the frequency components of the initial impulse signal in the time domain, the frequency components of the initial impulse signal are spread in the time domain according to a linear relationship between the group delay and the frequency; in the step of synthesizing the target frequency components spread in the time domain to output the pulse signal having the target waveform, the target frequency components spread in the time domain are synthesized according to a linear relationship between the group delay and the frequency.
In one embodiment, the slope of the group delay response used in the step of spreading the frequency components of the initial pulse signal in the time domain is equal to and opposite to the slope of the group delay response used in the step of synthesizing the target frequency components spread in the time domain to output the pulse signal with the target waveform
In one embodiment, the control signal is a narrowband signal.
According to the pulse signal forming system and method, each frequency component of the initial pulse signal is firstly expanded on a time domain, and the frequency components on the time domain are processed through the control signal, so that the frequency component corresponding to a target waveform, namely the target frequency component, is obtained. And finally, synthesizing the obtained target frequency components to obtain a pulse signal with a target waveform, so that any waveform can be output according to the requirement.
Drawings
FIG. 1 is a block diagram of a pulse signal shaping system in one embodiment;
FIG. 2 is a diagram illustrating an initial pulse signal of the pulse signal shaping system in one embodiment;
FIG. 3 is a graph of group delay versus frequency for a first signal processor in an embodiment;
FIG. 4 is a diagram illustrating the spreading of frequency components in the time domain after the initial pulse signal is processed by the first signal processor according to an embodiment;
FIG. 5 is a graph of group delay versus frequency for a third signal processor in an embodiment;
FIG. 6 is a target waveform output by the pulse signal shaping system in one embodiment;
FIG. 7 is a signal processing diagram of a pulse signal shaping system in one embodiment;
fig. 8 is a flowchart of a pulse signal shaping method in an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a block diagram of a pulse signal shaping system in an embodiment. The pulse signal forming system adopts microwave Analog Signal Processing (ASP) technology to realize pulse forming. Referring to fig. 1, the pulse waveform shaping system includes a first signal processor 110, a second signal processor 120, and a third signal processor 130. The first signal processor 110, the second signal processor 120 and the third signal processor 130 are connected in sequence.
The first signal processor 110 is configured to receive the initial pulse signal and spread frequency components of the initial pulse signal in a time domain. The initial pulse signal may be an arbitrary waveform signal. In this embodiment, the initial pulse signal is generally a high-speed pulse signalAs shown in fig. 2. The first signal processor 110 has a group delay (or group delay) characteristic, and the group delay is linear with respect to the frequency, so as to facilitate the control signal to process the frequency component of the pulse signal. The first signal processor 110 is configured to process the initial impulse signal according to a linear relationship between a group delay and a frequency thereof, so as to sequentially spread frequency components of the initial impulse signal in a time domain. Group delay is a quantity used to describe how fast the phase change varies with frequency. The group delay of the first signal processor 110 is linear with frequency. Therefore, if the group delay and the frequency of the first signal processor 110 are in a positive linear relationship (i.e. the slope of the group delay response is positive), the larger the frequency is, the larger the group delay is, so that the delay of the higher frequency component will be longer, the delay of the lower frequency component will be less, and the lower frequency component will appear earlier than the higher frequency component, thereby implementing the spreading of the initial pulse signal in the time domain. If the group delay of the first signal processor 110 is negatively linear with frequency, the opposite is true, and the lower frequency components will appear later than the higher frequency components. In the present embodiment, the first signal processor 110 is a dispersive group delay device, and the group delay is in a positive linear relationship with the frequency, i.e. the slope of the group delay response is positive, as shown in fig. 3. In fig. 3, the abscissa ω represents the frequency and τ represents the group delay. After processing by the first signal processor 110, the different frequency components of the initial pulse signal are spread out in the time domain, i.e. f1、f2、f2、……、fnAnd, as shown in FIG. 4. The signal spread in time domain has narrow bandwidth, and thus, the narrow control signal is used to process the frequency component of pulse signal.
The second signal processor 120 is used to generate a control signal. The control signal may be any signal that is commonly known. In this embodiment, the control signal is a narrowband signal. The control signal is used for processing the frequency component of the pulse signal spread on the time domain and reserving the frequency component corresponding to the output waveform, namely obtaining the target frequency component. The control signal can process the frequency components of the pulse signal in various ways, and can add or remove some frequency components, and also can enhance or weaken the amplitude of some frequency components, so as to obtain the target frequency components corresponding to the output waveform (i.e. the target waveform).
The third signal processor 130 is configured to synthesize the respective target frequency components spread in the time domain to output a pulse signal having a target waveform. The third signal processor 130 has the opposite action and effect compared to the first signal processor 110, thereby enabling the frequency components to be restored to the original time, and finally outputting a desired waveform. The third signal processor 130 is also a device with a linear relationship of group delay to frequency. In this embodiment, the third signal processor 130 and the first signal processor 110 both employ a dgd device. The slope of the group delay response of the third signal processor 130 and the first signal processor 110 are symmetrically arranged, i.e. the group delay response of the first signal processor 110 is a linear group delay with a positive slope, and the group delay response of the third signal processor 130 adopts a linear group delay with a negative slope. In this embodiment, the linear relationship between the group delay and the frequency of the third signal processor 130 is shown in fig. 5. In other embodiments, the arrangement may be reversed, and the third signal processor 130 may use devices having a negative linear relationship, and the first signal processor 110 may use devices having a positive linear relationship, that is, the slope of the two is equal in magnitude and opposite in sign. The desired target pulse waveform is obtained through the processing of the third signal processor 130, as shown in fig. 6.
The two dispersive group delay devices are symmetrically arranged, so that after the frequency components of the initial pulse signal are spread, the frequency components can be completely recovered without distortion except for control signal processing. For example, in the case of processing the frequency component without adding any control signal, the output waveform obtained after the initial pulse signal passes through the two dispersive group delay devices is the same as the initial pulse signal. FIG. 7 is a diagram illustrating an exemplary process, wherein A (t) represents an initial pulse signal, S (t) represents a control signal, and B (t) represents an output signal.
In the pulse signal forming system, the first signal processor 110 sequentially spreads the frequency components of the initial pulse signal in the time domain, and the second signal processor 120 processes the frequency components in the time domain by using the control signal to obtain the frequency components corresponding to the target waveform, i.e., the target frequency components. Finally, the third signal processor 130 synthesizes the obtained target frequency components to obtain a pulse signal having a target waveform, so that an arbitrary waveform can be output as necessary. The pulse signal forming system adopts a microwave analog time domain signal processing technology, and has a high processing speed. And the initial pulse signal is expanded on a time domain through a dispersive group delay device to obtain the most original analog form of the signal, and the signal is manipulated in the time domain in a real-time mode. The system processes the analog signals in a real-time mode, does not relate to any analog-digital signal conversion, reduces energy consumption and improves efficiency. Meanwhile, the input high-speed pulse signal is a signal with extremely wide bandwidth, and after the input high-speed pulse signal passes through the dispersive group delay device, the initial pulse signal is widened on a time domain, and the signal bandwidth is narrowed. The control signal can process wider signal only by common narrow-band signal, that is, a narrow-band signal is used to control very wide-band signal, so that it can conveniently control high-speed pulse to attain the goal of pulse formation.
The invention also provides a pulse signal shaping method, and a flow chart of the pulse signal shaping method is shown in fig. 8. The pulse shaping method includes the following steps.
And S810, receiving an initial pulse signal.
The initial pulse signal may be any signal. In this embodiment, the initial pulse signal is generally a high-speed pulse signal.
S820, the frequency components of the initial pulse signal are spread in the time domain.
And expanding each frequency component of the initial pulse signal on a time domain according to the linear relation between the group delay and the frequency.
S830, a control signal is generated and the frequency component on the time domain is processed by the control signal to output a target frequency component.
The control signal may be any signal that is commonly known. In this embodiment, the control signal is a narrowband signal. The control signal is used for processing the frequency component of the pulse signal spread on the time domain and reserving the frequency component corresponding to the output waveform, namely obtaining the target frequency component. The control signal can process the frequency components of the pulse signal in various ways, and can add or remove some frequency components, and also can enhance or weaken the amplitude of some frequency components, so as to obtain the target frequency components corresponding to the output waveform (i.e. the target waveform).
S840, synthesizing the respective target frequency components spread in the time domain to output a pulse signal having a target waveform.
And synthesizing each target frequency component expanded on the time domain according to the linear relation between the group delay and the frequency. In this embodiment, the linear relationship between the group delay and the frequency (i.e., the group delay response slope) adopted in S820 and S840 is symmetrically set, that is, the group delay response slopes of the two are equal in size and opposite in sign, so as to ensure that after the frequency components of the initial pulse signal are spread, the frequency components can be completely recovered without distortion except for the control signal processing.
The pulse signal forming method comprises the steps of sequentially expanding each frequency component of an initial pulse signal on a time domain, and processing the frequency components on the time domain through a control signal to obtain the frequency components corresponding to a target waveform, namely the target frequency components. And finally, synthesizing the obtained target frequency components to obtain a pulse signal with a target waveform, so that any waveform can be output according to the requirement.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A pulse signal shaping system, comprising:
a first signal processor for receiving an initial pulse signal and spreading each frequency component of the initial pulse signal in a time domain;
a second signal processor for generating a control signal and processing a frequency component on a time domain using the control signal to output a target frequency component; and
a third signal processor for synthesizing the respective target frequency components spread in the time domain to output a pulse signal having a target waveform;
the control signal generated by the second signal processor is a narrow-band signal;
the second signal processor is used for adding, removing, enhancing or weakening frequency components by utilizing the control signal.
2. The pulse signal shaping system of claim 1, wherein the initial pulse signal is a high-speed pulse signal.
3. The pulse signal shaping system of claim 1, wherein the first signal processor and the third signal processor are each a dispersive group delay device; the dispersive group delay device is a dispersive group delay device with linear relation between group delay and frequency.
4. A pulse signal shaping system according to claim 3, wherein the group delay response slopes of the first signal processor and the third signal processor are equal in magnitude and opposite in sign.
5. A method of pulse signal shaping, comprising:
receiving an initial pulse signal;
spreading each frequency component of the initial pulse signal on a time domain;
generating a control signal and processing a frequency component on a time domain using the control signal to output a target frequency component;
synthesizing each target frequency component spread in the time domain to output a pulse signal having a target waveform;
the control signal is a narrow-band signal;
the generating the control signal and processing the frequency component in the time domain by using the control signal to output the target frequency component includes adding, removing, enhancing or weakening the frequency component by using the control signal.
6. The method according to claim 5, wherein the step of spreading the frequency components of the initial pulse signal in the time domain is spreading the frequency components of the initial pulse signal in the time domain according to a linear relationship between group delay and frequency;
in the step of synthesizing the target frequency components spread in the time domain to output the pulse signal having the target waveform, the target frequency components spread in the time domain are synthesized according to a linear relationship between the group delay and the frequency.
7. The method of claim 6, wherein a slope of a group delay response used in the step of spreading frequency components of the initial pulse signal in the time domain is equal in magnitude and opposite in sign to a slope of a group delay response used in the step of synthesizing target frequency components spread in the time domain to output the pulse signal having the target waveform.
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| CN102608833A (en) * | 2012-04-12 | 2012-07-25 | 武汉邮电科学研究院 | Full optical time domain-frequency domain continuous Fourier transforming device |
| CN104267407A (en) * | 2014-09-12 | 2015-01-07 | 清华大学 | Initiative imaging method and system based on compressed sampling |
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| CN102608833A (en) * | 2012-04-12 | 2012-07-25 | 武汉邮电科学研究院 | Full optical time domain-frequency domain continuous Fourier transforming device |
| CN104267407A (en) * | 2014-09-12 | 2015-01-07 | 清华大学 | Initiative imaging method and system based on compressed sampling |
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