CN114826301A - Wide-band receiving equipment and receiving method with large dynamic range - Google Patents
Wide-band receiving equipment and receiving method with large dynamic range Download PDFInfo
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- CN114826301A CN114826301A CN202210748356.8A CN202210748356A CN114826301A CN 114826301 A CN114826301 A CN 114826301A CN 202210748356 A CN202210748356 A CN 202210748356A CN 114826301 A CN114826301 A CN 114826301A
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- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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 discloses a wide-band receiving device and a receiving method with a large dynamic range, wherein the device comprises a filter, a dynamic compression circuit, an analog-to-digital converter, a dynamic recovery operation module, an FFT module, a frequency domain amplitude limiter and an IFFT module which are connected in sequence; filtering an analog signal of a received broadband signal; then carrying out compression treatment; performing analog-to-digital conversion on the compressed signal; performing inverse compression on the digital signal, and converting the digital signal into a frequency domain; and limiting the interference signal according to the frequency domain signal amplitude. And performing IFFT transformation on the frequency domain signal after amplitude limiting to restore the frequency domain signal into a time domain signal. The method does not need to greatly modify the original system, and has the advantages of large dynamic range, strong anti-interference capability and good compatibility to various broadband communication protocols.
Description
Technical Field
The present invention relates to the field of communications devices, and in particular, to a wide-dynamic-range broadband receiving device and a wide-dynamic-range broadband receiving method.
Background
When a strong interfering signal is added to the receiver simultaneously with the desired signal, the strong interference may saturate the devices on the receiver chain, causing nonlinear distortion. For the current broadband communication system, such as direct spread spectrum communication DS, orthogonal frequency division multiplexing OFDM, and code division multiple access CDMA, when the in-band interference signal is small, the interference can be eliminated through correlation reception or forward error correction coding, etc., so that the useful signal can be transmitted. However, if the amplitude of the inband interferer is large, the ADC overflow is severe, and even if there is enough useful signal, the system cannot demodulate it.
Disclosure of Invention
Therefore, the present invention aims to provide a wide-dynamic-range broadband receiving device and a receiving method, which do not need to make great modification on the original system and have the advantages of large dynamic range, strong anti-interference capability and good compatibility with various broadband communication protocols.
In order to achieve the above object, the wide band receiving device with a large dynamic range of the present invention comprises a filter, a dynamic compression circuit, an analog-to-digital converter, a dynamic recovery operation module, an FFT module, a frequency domain amplitude limiter and an IFFT module, which are connected in sequence;
the filter is used for filtering the analog signal of the received broadband signal;
the dynamic compression circuit is used for compressing the analog signal of the received broadband signal, weakening the amplitude of a strong interference signal and avoiding the saturation of the analog-to-digital converter;
the analog-to-digital converter is used for converting the analog signal of the compressed broadband signal into a digital signal;
the dynamic recovery operation module is used for carrying out inverse compression on the digital signal;
the FFT module is used for converting the decompressed signal into a frequency domain;
the frequency domain amplitude limiter is used for limiting the interference signal according to the frequency domain signal amplitude.
The IFFT module is used for carrying out IFFT transformation on the frequency domain signals after amplitude limiting and restoring the frequency domain signals into time domain signals.
Preferably, in any of the above embodiments, the dynamic compression circuit is a square root compression circuit.
In any one of the above embodiments, preferably, the square root compression circuit includes a logarithm operation unit, a signal attenuation unit, and an inverse logarithm operation unit, which are connected in sequence.
Preferably, in any one of the above embodiments, the logarithmic operation unit includes a first resistor, a first operational amplifier, and a first triode; the output end of the filter is connected to one end of the first resistor, the inverting input end of the first operational amplifier is connected to the other end of the first resistor, the output end of the first operational amplifier is grounded, the inverting input end of the first operational amplifier is connected with the collector of the first triode, the base of the first triode is grounded, and the emitter and the output end of the first operational amplifier are connected with the signal attenuation unit.
Preferably, in any one of the above embodiments, the signal attenuation unit includes a second resistor and a third resistor; one end of the second resistor is connected with the output end of the logarithm operation unit, the other end of the second resistor is connected with one end of the third resistor to serve as the output end and the input end of the anti-logarithm operation unit, and the other end of the third resistor is grounded.
In any one of the above embodiments, preferably, the attenuation multiple of the signal attenuation unit is set according to a ratio of the resistances of the second resistor and the third resistor.
Preferably, in any one of the above embodiments, the anti-log unit includes a second transistor, a fourth resistor, and a second operational amplifier; the collector and the base of the second triode are both connected with the output end of the signal attenuation unit, the emitter of the second operational amplifier is connected with the inverting input end of the second operational amplifier, and the fourth resistor is connected between the inverting input end and the output end of the second operational amplifier in parallel.
In any one of the above embodiments, preferably, the dynamic recovery operation module is a multiplier performing a square operation.
The invention also provides a broadband receiving method with a large dynamic range, which is implemented based on the broadband receiving equipment and comprises the following steps:
s1, filtering the received analog signal of the broadband signal with a large dynamic range;
s2, compressing the analog signal of the filtered broadband signal, and weakening the amplitude of the strong interference signal;
s3, converting the analog signal of the compressed broadband signal into a digital signal;
s4, performing inverse compression on the digital signal;
s5, converting the signal after the decompression into a frequency domain;
s6, limiting the interference signal according to the frequency domain signal amplitude;
s7, IFFT transforms the limited frequency domain signal to restore to a time domain signal.
Further preferably, in S2, the compressing process of the analog signal of the filtered broadband signal includes the following compressing processes:
taking logarithm ln (x) of the filtered signal by using a logarithm arithmetic circuit, and reducing the amplitude of the signal by half ln (x)/2 by using an 1/2 signal attenuation circuit; by means of inverse logarithm operation, the halved signal is converted into the signal shown in the following formula
Where x represents the original filtered signal and y represents the attenuated signal.
Further preferably, in S4, the digital signal is decompressed according to the following formula:
wherein inv is the inversion operation, x is the compressed signal, and y is the inverted signal.
Compared with the existing equipment, the broadband receiving equipment and the broadband receiving method with the large dynamic range disclosed by the application have the following advantages that:
1. according to the broadband receiving equipment and the receiving method with the large dynamic range, the signal is compressed dynamically in an analog domain, and the signal is decompressed by inverse operation in a digital domain after being sampled by an ADC (analog-to-digital converter). The dynamic compression circuit is used for suppressing strong interference signals to avoid ADC saturation, then the inverse operation of compression is carried out in a digital domain, the signals are converted into a frequency domain through FFT conversion, after amplitude limiting processing is carried out on the signals in the frequency domain, the signals are restored to a time domain through IFFT. The recovered signal follows the previous wideband reception digital processing chain. The method does not need to greatly modify the original system, and has the advantages of large dynamic range, strong anti-interference capability and good compatibility to various broadband communication protocols.
2. According to the broadband receiving equipment and the broadband receiving method with the large dynamic range, the square root operation is optimized in dynamic compression operation, and the broadband receiving equipment and the broadband receiving method have the characteristics of small signal attenuation and large strong interference signal attenuation;
3. according to the wide-dynamic-range broadband receiving equipment and the receiving method, the inverse operation of the compression operation is carried out on the signals converted into the digital domain by the ADC; the inverse operation to the square root operation is a square operation and can be conveniently and quickly realized by multiplication in a digital domain.
4. According to the wide-dynamic-range broadband receiving equipment and the receiving method, compressed data are subjected to inverse operation of compression in a digital domain, then the compressed data are converted into a frequency domain through FFT (fast Fourier transform), time domain signals are recovered through frequency domain amplitude limiting and IFFT (inverse fast Fourier transform), the recovered signals can continue to use an original broadband receiving digital processing link, and an original system does not need to be greatly modified. The method has the advantages of large dynamic range, strong anti-interference capability and good compatibility to various broadband communication protocols.
5. The wide-band receiving device and the receiving method with the large dynamic range can be applied to wide-band communication systems such as a direct spread spectrum sequence (DS), Orthogonal Frequency Division Multiplexing (OFDM), Code Division Multiple Access (CDMA) and the like, and can also be applied to other wide-band communication systems.
Drawings
Fig. 1 is a system block diagram of a wide-band receiving device with a large dynamic range provided by the present invention.
FIG. 2 is a schematic block diagram of a square root compression circuit provided by the present invention.
FIG. 3 is a schematic diagram of a square root compression circuit provided by the present invention.
Fig. 4 is a flowchart of a wide-band receiving method with a large dynamic range according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
As shown in fig. 1, in an aspect of the present invention, a wide-band receiving device with a large dynamic range includes a filter, a dynamic compression circuit, an analog-to-digital converter, a dynamic recovery operation module, an FFT module, a frequency domain limiter, and an IFFT module, which are connected in sequence;
the filter is used for filtering the analog signal of the received broadband signal;
the dynamic compression circuit is used for compressing the analog signal of the received broadband signal, weakening the amplitude of a strong interference signal and avoiding the saturation of the analog-to-digital converter;
the analog-to-digital converter is used for converting the analog signal of the compressed broadband signal into a digital signal;
the dynamic recovery operation module is used for carrying out inverse compression on the digital signal;
the FFT module is used for converting the decompressed signal into a frequency domain;
the frequency domain amplitude limiter is used for limiting the interference signal according to the frequency domain signal amplitude.
The IFFT module is used for carrying out IFFT transformation on the frequency domain signals after amplitude limiting and restoring the frequency domain signals into time domain signals.
The dynamic compression circuit is a square root compression circuit.
As shown in fig. 2, the square root compression circuit includes a logarithmic operation unit, a signal attenuation unit, and an anti-logarithmic operation unit, which are connected in sequence. As shown in fig. 3, the logarithmic operation unit includes a first resistor R1, a first operational amplifier U1, and a first transistor Q1; the output end of the filter is connected to one end of the first resistor R1, the inverting input end of the first operational amplifier U2 is connected to the other end of the first resistor R1, the output end of the first operational amplifier U1 is grounded, the inverting input end of the first operational amplifier U1 is connected with the collector of the first triode Q1, the base of the first triode Q1 is grounded, and the emitter and the output end of the first operational amplifier U1 are connected with the signal attenuation unit. The signal attenuation unit comprises a second resistor R2 and a third resistor R3; one end of the second resistor R2 is connected with the output end of the logarithm arithmetic unit, the other end of the second resistor R2 is connected with one end of the third resistor R3 to be used as the output end and the input end of the inverse logarithm arithmetic unit, and the other end of the third resistor R3 is grounded.
The attenuation times of the signal attenuation unit are set according to the resistance value ratio of the second resistor R2 and the third resistor R3.
The anti-log operation unit comprises a second triode Q2, a fourth resistor R4 and a second operational amplifier U2; the collector and the base of the second triode Q2 are both connected with the output end of the signal attenuation unit, the emitter of the second operational amplifier U2 is connected with the inverting input end of the second operational amplifier U2, and the fourth resistor R4 is connected in parallel between the inverting input end and the output end of the second operational amplifier.
The dynamic recovery operation module is a multiplier for performing square operation.
The dynamic compression circuit realizes dynamic compression of a real re-signal, and the functional block diagram of the dynamic compression circuit is shown in fig. 2: the square root dynamic compression is preferably adopted, and the circuit implementation process is as follows:
the signal is logarithmized ln (x) by a logarithmic operation circuit. The signal amplitude is reduced by half ln (x)/2 by 1/2 signal attenuation circuit. By means of inverse logarithm operation, the halved signal is converted into the signal shown in the following formula 1
The square root dynamic compression circuit is embodied as shown in FIG. 3. The logarithm operation circuit is realized by a circuit consisting of R1, U1 and Q1, the base of Q1 is grounded, which is equivalent to an exponential working area mode of a diode, and the logarithm operation is realized after the inversion of the operational amplifier. 1/2 the signal attenuation circuit is realized by the voltage dividing circuit composed of R2 and R3, the attenuation multiple can be realized by adjusting the voltage dividing resistance of R2 and R3. The anti-log operation is realized by a circuit consisting of Q2, R4 and U2. The analog-to-digital converter ADC module mainly realizes the conversion of signals from an analog domain to a digital domain.
The dynamic recovery operation realizes dynamic recovery through the inverse operation of dynamic compression. In the embodiment, the square root operation is performed by the inverse operation of the square root operation, i.e., the square root operation. The inverse of the square root operation can be implemented in the digital domain by multiplication, i.e. by multiplying the signal by itself, as shown in equation 2 below.
Where inv is the inverse operation, x is the compressed signal, and y is the inverted signal.
A Fast Fourier Transform (FFT) performs the conversion of the signal time domain to the frequency domain. The frequency domain amplitude limiter mainly has the functions of reducing the amplitude of interference or overlarge useful signals, calculating the distribution characteristic of a power spectrum through a power spectrum extraction module, and comparing and analyzing the power spectrum with a power spectrum specified by a protocol. And then the frequency domain amplitude limiting module is used for attenuating the power spectrum of the exceeding part. An Inverse Fast Fourier Transform (IFFT) restores the clipped frequency domain signal to the time domain.
As shown in fig. 4, the present invention further provides a wide-band receiving method with a large dynamic range, which is implemented based on the above-mentioned wide-band receiving device, and includes the following steps:
s1, filtering the received analog signal of the broadband signal with a large dynamic range;
s2, compressing the analog signal of the filtered broadband signal, and weakening the amplitude of the strong interference signal; the further compression process is implemented by the square root dynamic compression, and the compression principle is shown in formula 1.
S3, converting the analog signal of the compressed broadband signal into a digital signal;
s4, performing inverse compression on the digital signal; when performing the inverse compression, the compression principle is shown in equation 2.
S5, converting the signal after the decompression into a frequency domain;
s6, limiting the interference signal according to the frequency domain signal amplitude;
s7, IFFT-transforming the limited frequency domain signal to restore the signal to a time domain signal.
The invention provides a wide-dynamic-range broadband receiving device and a receiving method, which are characterized in that after a received signal is filtered by a filter, a dynamic compression circuit is used for compressing to restrain strong interference signals and avoid ADC saturation, an analog-to-digital converter is used for converting the signal into a digital domain and then decompressing the digital domain by a dynamic recovery operation module, after the signal is recovered, the signal is converted into a frequency domain by an FFT module, and after the signal of the frequency domain is subjected to amplitude limiting processing by a frequency domain amplitude limiter, the signal is recovered to a time domain by IFFT. The restored signal follows the former broadband receiving digital processing link, and the structure is simple.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A broadband receiving device with a large dynamic range is characterized by comprising a filter, a dynamic compression circuit, an analog-to-digital converter, a dynamic recovery operation module, an FFT module, a frequency domain amplitude limiter and an IFFT module which are connected in sequence;
the filter is used for filtering the analog signal of the received broadband signal;
the dynamic compression circuit is used for compressing the analog signal of the received broadband signal and weakening the amplitude of a strong interference signal;
the analog-to-digital converter is used for converting the analog signal of the compressed broadband signal into a digital signal;
the dynamic recovery operation module is used for carrying out inverse compression on the digital signal;
the FFT module is used for converting the decompressed signal into a frequency domain;
the frequency domain amplitude limiter is used for limiting the interference signal according to the frequency domain signal amplitude;
the IFFT module is used for carrying out IFFT transformation on the frequency domain signals after amplitude limiting and restoring the frequency domain signals into time domain signals.
2. The wide dynamic range broadband receiving device of claim 1, wherein the dynamic compression circuit is a square root compression circuit; the square root compression circuit comprises a logarithm operation unit, a signal attenuation unit and an inverse logarithm operation unit which are connected in sequence.
3. The wide dynamic range broadband receiving device of claim 2, wherein the logarithmic operation unit comprises a first resistor, a first operational amplifier, and a first transistor; the output end of the filter is connected to one end of the first resistor, the inverting input end of the first operational amplifier is connected to the other end of the first resistor, the output end of the first operational amplifier is grounded, the inverting input end of the first operational amplifier is connected with the collector of the first triode, the base of the first triode is grounded, and the emitter and the output end of the first operational amplifier are connected with the signal attenuation unit.
4. The wide dynamic range broadband receiving device of claim 2, wherein the signal attenuation unit comprises a second resistor and a third resistor; one end of the second resistor is connected with the output end of the logarithm operation unit, the other end of the second resistor is connected with one end of the third resistor to serve as the output end and the input end of the anti-logarithm operation unit, and the other end of the third resistor is grounded.
5. The wide dynamic range broadband receiving device according to claim 4, wherein the attenuation factor of the signal attenuation unit is set according to a ratio of the resistance values of the second resistor and the third resistor.
6. The wide dynamic range broadband receiving device of claim 2, wherein the anti-log operation unit comprises a second transistor, a fourth resistor, and a second operational amplifier; the collector and the base of the second triode are both connected with the output end of the signal attenuation unit, the emitter of the second operational amplifier is connected with the inverting input end of the second operational amplifier, and the fourth resistor is connected in parallel between the inverting input end and the output end of the second operational amplifier.
7. The wide dynamic range broadband receiving device of claim 3, wherein the dynamic recovery operation module is a multiplier that performs a squaring operation.
8. A wide dynamic range wideband reception method implemented based on the wideband reception apparatus of any one of claims 1 to 7, comprising the steps of:
s1, filtering the received analog signal of the broadband signal with a large dynamic range;
s2, compressing the analog signal of the filtered broadband signal, and weakening the amplitude of the strong interference signal;
s3, converting the analog signal of the compressed broadband signal into a digital signal;
s4, performing inverse compression on the digital signal;
s5, converting the signal after the decompression into a frequency domain;
s6, limiting the interference signal according to the frequency domain signal amplitude;
s7, IFFT transforms the limited frequency domain signal to restore to a time domain signal.
9. The wide-dynamic-range wideband reception method according to claim 8, wherein the compressing the analog signal of the filtered wideband signal in S2 includes the following steps:
taking logarithm ln (x) of the filtered signal by using a logarithm arithmetic circuit, and reducing the amplitude of the signal by half ln (x)/2 by using an 1/2 signal attenuation circuit; by means of inverse logarithmic operation, the halved signal is shown in the following formula
Where x represents the original filtered signal and y represents the attenuated signal.
10. The wide dynamic range wideband reception method according to claim 8, wherein in S4, the digital signal is decompressed according to the following formula:
wherein inv is the inversion operation, x is the compressed signal, and y is the inverted signal.
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