CN114826286A - Millimeter wave processing device - Google Patents
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- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0028—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at baseband stage
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- 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
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0028—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at baseband stage
- H04B1/0039—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at baseband stage using DSP [Digital Signal Processor] quadrature modulation and demodulation
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- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
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- H04L5/00—Arrangements affording multiple use of the transmission path
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Abstract
The embodiment of the invention provides a millimeter wave processing device which comprises a receiving processing link and a sending processing link, wherein the receiving processing link consists of a millimeter wave antenna, an LNA unit, a duplex filtering unit, a radio frequency processing unit, a digital-analog processing unit and a BBU module in sequence, and the sending processing link consists of the BBU module, the digital-analog processing unit, the radio frequency processing unit, a PA unit, the duplex filtering unit and the millimeter wave antenna in sequence. The device correspondingly adjusts the primary filter in the receiving processing link to the rear end of the amplifier, thereby avoiding amplifying the incompletely filtered noise and clutter while amplifying the signal after the front end filtering, and ensuring the cleanness and stability of the signal.
Description
Technical Field
The invention relates to the technical field of antenna signal equipment, in particular to a millimeter wave processing device.
Background
With the rapid development of the communication industry, especially personal mobile communication, the low-end frequency of the radio frequency spectrum is becoming saturated, and even if gaussian filtering minimum shift keying (GMSK) modulation or various multiple access techniques are adopted to expand the capacity of the communication system and improve the utilization rate of the frequency spectrum, the requirements of future communication development cannot be met, so that new frequency spectrum resources must be developed towards the microwave high-frequency band to realize high-speed and broadband wireless communication. The millimeter wave has short wavelength and wide frequency band, so that many problems in high-speed broadband wireless access can be effectively solved, and the millimeter wave has wide application prospect in short-distance wireless communication.
At present, as shown in fig. 4, in a millimeter wave processing device from an antenna to a rear end, a filter is directly used at the rear end of the antenna, so that for a received signal, after filtering and then amplifying, because amplification is performed on the whole signal after filtering, noise and clutter contained in the received signal are also amplified correspondingly, so that the filtering effect is poor, subsequent interference is still serious, and the problems of signal access and the like are affected.
Disclosure of Invention
In view of the problem, the present invention has been made to provide a millimeter wave processing apparatus that overcomes or at least partially solves the problem, including:
in an embodiment of the present application, a millimeter wave processing apparatus is disclosed, including:
the receiving processing link comprises a millimeter wave antenna for receiving millimeter wave signals and an LNA unit for amplifying the millimeter wave signals; the duplex filtering unit is used for filtering the amplified millimeter wave signals; the radio frequency processing unit is used for receiving, processing and filtering the millimeter wave signals and converting the millimeter wave signals into radio frequency millimeter wave signals; the digital-to-analog processing unit is used for receiving the radio frequency millimeter wave signal and converting the radio frequency millimeter wave signal into a digital millimeter wave signal; the BBU module is used for receiving the digital millimeter wave signal and carrying out corresponding processing;
the sending processing link comprises the BBU module and is used for receiving and processing a baseband signal and sending the baseband signal to the digital-analog processing unit; the digital-to-analog processing unit is used for converting the baseband signal into an analog signal and sending the analog signal to the radio frequency processing unit; the radio frequency processing unit is used for converting the analog signal into a sending radio frequency signal and sending the sending radio frequency signal to the PA unit; the PA unit is used for amplifying the sending radio frequency signal and sending the sending radio frequency signal to the duplex filtering unit; and the duplex filtering unit filters the amplified transmission radio frequency signal and transmits the filtered transmission radio frequency signal to the millimeter wave antenna for signal transmission.
Further, the duplex filtering unit includes a first filtering module for providing received signal filtering in the receiving processing link, and a second filtering module for providing transmitted signal filtering in the transmitting processing link, where the first filtering module and the second filtering module are independent filtering modules isolated from each other.
Further, the radio frequency processing unit includes a radio frequency receiving link belonging to the receiving processing link, wherein the radio frequency receiving link is sequentially composed of a band pass filter, an RF amplifier, a mixer, an IF amplifier, an IQ demodulator and a low pass filter according to a signal transmission direction, wherein the mixer is further connected with a UFH local oscillator for providing the UFH local oscillator signal to the mixer, the IQ demodulator has a first I channel and a first Q channel, and the VFH local oscillator provides the VFH local oscillator signal with a phase difference of 90 ° for the first I channel and the first Q channel; wherein the band pass filter is connected to the LNA unit; the first I channel and the first Q channel are respectively connected with a DAC module of the digital-to-analog processing unit through the low-pass filter;
the radio frequency processing unit further comprises a radio frequency transmission link belonging to the transmission processing link, wherein the radio frequency transmission link is sequentially composed of the low-pass filter, an IQ modulator, an IF amplifier, the mixer, the RF amplifier and the band-pass filter according to a signal transmission direction, wherein the mixer is connected with the UFH local oscillator for providing UFH local oscillator signals for the mixer, the IQ modulator has a second I channel and a second Q channel, and the VFH local oscillator provides VFH local oscillator signals with a phase difference of 90 ° for the second I channel and the second Q channel; wherein the band pass filter provides millimeter wave signals to the PA unit; the second I channel and the second Q channel are respectively connected to an ADC module of the digital-to-analog processing unit through the low-pass filter.
Further, the band pass filter includes a SAW filter, a BAR filter, and a BAW filter.
Further, the IF amplifier is a programmable gain amplifier.
Further, the antenna also comprises a pre-filter, and the pre-filter is arranged between the millimeter wave antenna and the LNA unit.
Further, the mobile terminal further comprises a channel switching unit, wherein the channel switching unit is arranged at the rear end of the antenna and is used for switching the connection between the receiving processing link and the antenna and the connection between the transmitting processing link and the antenna.
Further, the device also comprises a signal frequency monitoring unit and a filter selecting unit;
the signal frequency monitoring unit is used for monitoring the received and transmitted signal frequency and transmitting a control instruction to the filter selection unit according to a monitoring result;
the filter selection unit is used for cutting the band-pass filter corresponding to the suitable frequency according to the instruction. In an embodiment of the present application, a millimeter wave processing apparatus is further disclosed, including: the receiving processing link comprises a millimeter wave antenna for receiving millimeter wave signals and an LNA unit for amplifying the millimeter wave signals; the duplex filtering unit is used for filtering the amplified millimeter wave signals; the RF analog-to-digital conversion module is used for receiving and processing the millimeter wave signals after filtering and outputting digital millimeter wave signals; the BBU module is used for receiving the digital millimeter wave signal and carrying out corresponding processing;
the transmission processing link comprises the BBU module and is used for receiving and processing a baseband signal and transmitting the baseband signal to the RF digital-to-analog conversion module; the RF digital-to-analog conversion module is used for converting the baseband signal into a transmission radio frequency signal and transmitting the transmission radio frequency signal to the PA unit; the PA unit is used for amplifying the sending radio frequency signal and sending the sending radio frequency signal to the duplex filtering unit; and the duplex filtering unit filters the amplified transmission radio frequency signal and transmits the filtered transmission radio frequency signal to the millimeter wave antenna for signal transmission.
Further, the device also comprises a one-way isolator, wherein the one-way isolator is arranged between the PA unit and the millimeter wave antenna and is used for isolating signals received by the millimeter wave antenna from being transmitted into the sending processing link from the antenna.
The invention has the following advantages:
in the embodiment of the invention, through the receiving processing link, the millimeter wave antenna is used for receiving millimeter wave signals and is amplified by the LNA unit; the duplex filtering unit is used for filtering the amplified millimeter wave signals; the radio frequency processing unit is used for receiving, processing and filtering the millimeter wave signals and converting the millimeter wave signals into radio frequency millimeter wave signals; the digital-to-analog processing unit is used for receiving the radio frequency millimeter wave signal and converting the radio frequency millimeter wave signal into a digital millimeter wave signal; the BBU module is used for receiving the digital millimeter wave signal and carrying out corresponding processing; the sending processing link comprises the BBU module and is used for receiving and processing a baseband signal and sending the baseband signal to the digital-analog processing unit; the digital-to-analog processing unit is used for converting the baseband signal into an analog signal and sending the analog signal to the radio frequency processing unit; the radio frequency processing unit is used for converting the analog signal into a sending radio frequency signal and sending the sending radio frequency signal to the PA unit; the PA unit is used for amplifying the sending radio frequency signal and sending the sending radio frequency signal to the duplex filtering unit; and the duplex filtering unit filters the amplified transmission radio frequency signal and transmits the filtered transmission radio frequency signal to the millimeter wave antenna for signal transmission. The device correspondingly adjusts the primary filter in the receiving processing link to the rear end of the amplifier, thereby avoiding amplifying the incompletely filtered noise and clutter while amplifying the signal after the front end filtering, and ensuring the cleanness and stability of the signal.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a millimeter wave processing apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a millimeter wave processing apparatus according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a millimeter wave processing apparatus according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of a millimeter wave processing apparatus according to the prior art;
fig. 5 is a schematic structural diagram of an rf transceiver unit according to an embodiment of the present invention.
In the drawings: 10. a millimeter wave antenna; 40. a radio frequency processing unit; 50. a digital-to-analog processing unit; 60, a BBU module; 201. a pre-filter; 202. a duplex filtering unit; 301. a PA unit; 302. an LNA unit; 401. a band-pass filter; 402. an RF amplifier; 403. an IF amplifier; 404. a mixer; 405. an IQ modulator; 406. an IQ demodulator; 407. a low-pass filter; 411. UHF local oscillation; 412. a VHF local oscillator; 501. an RF digital-to-analog conversion module; 502. and an RF analog-to-digital conversion module.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all 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.
Referring to fig. 1, a millimeter wave processing apparatus according to an embodiment of the present invention is shown, including: the receiving processing link is sequentially composed of a millimeter wave antenna 10, an LNA unit 302, a duplex filtering unit 202, a radio frequency processing unit 40, a digital-to-analog processing unit 50 and a BBU module 60, wherein the millimeter wave antenna 10 is used for receiving millimeter wave signals, and the LNA unit 302 is used for amplifying the millimeter wave signals; the duplex filtering unit 202 is configured to filter the amplified millimeter wave signal; the radio frequency processing unit 40 is configured to receive the millimeter wave signal after being filtered and convert the millimeter wave signal into a radio frequency millimeter wave signal; the digital-to-analog processing unit 50 is configured to receive the radio frequency millimeter wave signal and convert the radio frequency millimeter wave signal into a digital millimeter wave signal; the BBU module 60 is configured to receive the digital millimeter wave signal and perform corresponding processing;
a sending processing link, which is sequentially composed of the BBU module 60, the digital-to-analog processing unit 50, the radio frequency processing unit 40, the PA unit 301, the duplex filtering unit 202, and the millimeter wave antenna 10, wherein the BBU module 60 is configured to receive and process a baseband signal and send the baseband signal to the digital-to-analog processing unit 50; the digital-to-analog processing unit 50 is configured to convert the baseband signal into an analog signal, and send the analog signal to the radio frequency processing unit 40; the rf processing unit 40 is configured to convert the analog signal into a transmission rf signal, and transmit the transmission rf signal to the PA unit 301; the PA unit 301 is configured to amplify the transmit rf signal and transmit the amplified transmit rf signal to the duplex filtering unit 202; the duplex filtering unit 202 filters the amplified transmission rf signal, and transmits the filtered transmission rf signal to the millimeter wave antenna 10 for signal transmission.
In the embodiment of the invention, the primary filter (duplex filtering unit) in the receiving processing link is correspondingly adjusted to the rear end of the amplifier through the device, so that the phenomenon that noise and clutter which are not completely filtered are amplified when the signal is amplified after the front end is filtered is avoided, and the cleanness and stability of the signal are ensured.
Next, a millimeter wave processing apparatus in the present exemplary embodiment will be further described.
In an embodiment of the present invention, the duplex filtering unit 202 includes a first filtering module for providing received signal filtering in the receiving processing link, and a second filtering module for providing transmitted signal filtering in the transmitting processing link, where the first filtering module and the second filtering module are independent filtering modules isolated from each other.
In the above embodiment, the mutually independent filtering modules are used for filtering the mutually independent modules with input and output in the same filter, so that a better filtering effect is realized without changing the structure of the original filter.
The LNA unit 302 is a Low Noise Amplifier (LNA), which is mainly used in the design of a receiving circuit. Since the signal-to-noise ratio in the receiving circuit is usually very low, and the signal is often much smaller than the noise, the signal and the noise are amplified together when passing through the amplifier, which is very unfavorable for the subsequent processing, and thus the amplifier is required to suppress the noise. The LNA is used in the receiver with a low bias due to the strict requirement for noise, which can achieve a low NF and high efficiency, but at the same time results in a low linear gain and a low maximum input power (also referred to as 1dB compression). The LNA amplifies the signal with substantially less current, on the one hand because of the small signal and on the other hand because of its high efficiency and low bias. It is known that NF (near field communication) is deteriorated when the current is large.
In an embodiment of the present application, as shown in fig. 5, the RF processing unit 40 includes an RF receiving link belonging to the receiving processing link, where the RF receiving link is sequentially composed of a band-pass filter 401, an RF amplifier 402, a mixer 404, an IF amplifier 403, an IQ demodulator 406, and a low-pass filter 407 according to a signal transmission direction, where the mixer 404 is further connected to a UFH local oscillator 411 for providing a UFH local oscillator signal to the mixer 404, the IQ demodulator 406 has a first I channel and a first Q channel, and the VFH local oscillator 412 provides a VFH local oscillator signal with a phase difference of 90 ° for the first I channel and the first Q channel; wherein the band pass filter 401 is connected to the LNA unit 302; the first I channel and the first Q channel are respectively connected to the DAC module of the digital-to-analog processing unit 50 through the low-pass filter 407;
the RF processing unit 40 further includes an RF transmitting link belonging to the transmitting processing link, wherein the RF transmitting link is sequentially composed of the low pass filter 407, an IQ modulator 405, an IF amplifier 403, the mixer 404, the RF amplifier 402, and the band pass filter 401 according to a signal transmission direction, wherein the mixer 404 is connected to the UFH local oscillator 411 for providing a UFH local oscillator signal thereto, the IQ modulator has a second I channel and a second Q channel, and the VFH local oscillator 412 provides a VFH local oscillator signal having a phase difference of 90 ° for the second I channel and the second Q channel; wherein the band pass filter 401 supplies the millimeter wave signal to the PA unit 301; the second I channel and the second Q channel are respectively connected to the ADC module of the digital-to-analog processing unit 50 through the low pass filter 407.
In the above embodiment, in the radio transmission link, the radio frequency transmission link in the transmission processing link is configured to implement a digital Up converter (duc), and in the radio transmission link, the digital signal is converted into an analog signal, the analog signal is subjected to frequency mixing to obtain a desired radio frequency center frequency higher than an original signal, then the signal is amplified to a proper power level, and finally the signal is transmitted through an antenna after a bandwidth is limited. This is the case for any wave signal generator (AWG) that generates a digitally modulated signal, but the clock frequency of the DAC determines the highest signal frequency that can be output.
The IQ demodulator 406 of the receiving processing chain via the above-mentioned radio frequency receiving chain, and similarly, the function as the analog IQ demodulator 406 can also be realized in a digital manner, which is called digital down-conversion. Compared with an analog demodulator, the digital down-conversion is more widely applied, and the basic idea is as follows: the radio frequency signal is down-converted to an IF frequency band, then directly discretized by an ADC (analog-to-digital conversion), a digital IQ signal can be obtained by performing digital down-conversion on the discretized data, and finally the IQ signal is processed and sent to the BBU module 60. In the receive processing chain, through the rf receive chain, the signal received at the antenna is mixed at mixer 404 with a signal generated by UHF local oscillator 411, and when the frequency of the mixing is equal to the intermediate frequency, this signal may be amplified by an intermediate frequency amplifier and then peak detected. The detected signal is amplified by a video amplifier and then output to a subsequent stage. Since the oscillation frequency of the UHF local oscillator 411 circuit varies with time, the received frequencies are different at different times. When the frequency of the UHF local oscillator 411 changes with time, the amplitudes of the signals at different frequencies are obtained, and the amplitudes of the signals at different frequencies can be stored and recorded in the memory, so that the frequency spectrum of the detected signal is obtained.
In the present embodiment, VHF (Very High Frequency) means radio waves having a Frequency band of 30Mhz to 300 Mhz. A very High Frequency (HF) lower than the VHF radio Frequency, and a UHF higher than the VHF radio Frequency, wherein when the VHF local oscillator 412 is the IQ modulator 405 and the IQ demodulator 406, VFH local oscillator signals with a phase difference of 90 ° are provided, so that a 90 ° phase difference exists between the carrier waves of the two signals of the I channel and the Q channel, and the two signals are kept orthogonal, for example, after the I channel and the Q channel baseband signals of the transmission processing link in fig. 2 are mixed, the RF signals are added; if the phase of the carrier wave is required to be modulated, the amplitude of the signals of the path I and the path Q is only required to be changed; the requirement for the suppression degree of the filter can be reduced, and specifically, the analysis is carried out from the time domain: assuming that the input signal is sin (2 pi f1t) and the local oscillator signal is sin (2 pi f2t), the output signal is sin (2 pi f1t) cos (2 pi f2t) + cos (2 pi f1t) sin (2 pi f2t) sin (2 pi (f1+ f2) t), and only one sideband signal cancels the other sideband signal. Even if there is an non-ideality in the link, the energy in the other sideband is lower than in the conventional single mixer architecture, reducing the requirements on the transmit filter rejection. Conversely, the above advantages also exist in the transmission processing link.
As an example, 1 instance is a double sideband amplitude modulated signal for AM radio, which uses twice the bandwidth than actually needed, such a signal being the same at low and above carrier frequencies. For example, two-dimensional modulation may be employed. These complex signals are encoded and modulated into real and imaginary components. Complex signals are suitably down-converted using quadrature control. The quadrature control not only converts, filters and decimates the sampled IF (Intermediate Frequency) signal, but it also separates the IF signal into real and imaginary components. The real part is the in-phase (I) signal and the imaginary part is the 90 ° phase shifted (Q) signal. IQ modulator 405, generates two carrier signals: i and Q carriers, which are phase shifted by 90 °. These signals are mixed independently, and the input IF signal is converted to baseband I and Q components, filtered and decimated as before for each path. The post-stage processing unit then further processes the I and Q signals or the following processes record them.
In an embodiment of the present application, the band pass filter 401 includes a SAW filter, a BAR filter, and a BAW filter; the band pass filter 401 may be an LC band pass filter.
In the above embodiments, the SAW filter is a Surface Acoustic Wave (SAW) filter, and is widely applied to a 2G receiver front end, a duplexer, and a receiving filter. The SAW filter integrates low insertion loss and good suppression performance, not only can realize wide bandwidth, but also has a volume much smaller than that of a traditional cavity or even a ceramic filter. Since the SAW filter is formed on a wafer, mass production can be performed at low cost. SAW technology also supports the integration of filters and duplexers for different frequency bands on a single chip with little or no additional processing; the surface acoustic wave element mainly functions on the principle that an input signal of electric waves is converted into mechanical energy by using the piezoelectric property of a piezoelectric material and an input and output Transducer (Transducer), and the mechanical energy is converted into an electric signal after being processed, so that the aims of filtering unnecessary signals and clutter and improving the signal quality are fulfilled. It can replace LC resonance circuit for interstage coupling and filtering. Mainly used to filter out the impurities, and is simpler to install and smaller in size than the conventional LC filter.
Although SAW and TC-SAW filters are well suited for applications within about 1.5GHz, above 1.5GHz, BAW filters have a significant performance advantage. The BAW filter also shrinks in size with increasing frequency, which makes it very suitable for very demanding 3G and 4G applications. Furthermore, even in high bandwidth designs, BAWs are less sensitive to temperature variations, while they also have very low losses and very steep filter skirts. For frequencies above 1.5GHz, BAW filters have a significant performance advantage, unlike SAW filters, where the acoustic waves propagate vertically within the BAW filter. In BAW resonators using quartz crystal as the substrate, metal embedded on both sides of the top and bottom of the quartz substrate excites the acoustic wave, which bounces from the top surface to the bottom to form a standing acoustic wave.
The SAW filter is a surface acoustic wave filter, wireless signals are converted into acoustic signals by the piezoelectric effect at the input end and are transmitted on the surface of a medium, and the acoustic signals are converted into the wireless signals by the inverse piezoelectric effect at the output end; BAW is a bulk acoustic wave, and the FBAR technology is adopted, the principle is basically the same as that of SAW, and the only difference is that an acoustic signal is transmitted inside a medium, so that the volume can be smaller (the dielectric constant of the medium is larger than that of air). BAW may perform relatively better, q-value, phase noise, small, etc. The BAW filter can be composed of 3 layers, with metal electrodes above and below and piezoelectric material in the middle, for example, when the resonant frequency is about 2GHz, the preferred thickness is (0.1um (electrode), 3um (piezoelectric layer), 0.1um (electrode)); BAW is typically used when the frequency is high, such as 3G, whereas SAW is typically used to meet the requirements when the frequency is below 1900 MHz.
In an embodiment of the present application, the IF amplifier 403 is a programmable gain amplifier.
In the above embodiment, the programmable gain amplifier is a highly versatile amplifier, and the amplification factor thereof can be controlled by a program as required. By adopting the amplifier, the full-scale signal of the A/D converter can be homogenized by adjusting the amplification factor through a program, thereby greatly improving the measurement precision. The automatic range conversion is to automatically adjust the multiple of the processed signal by using a programmable gain amplifier according to the requirement so as to meet the requirements of subsequent circuits and systems. There are two types of programmable gain amplifiers-combined PGA and integrated PGA. The combined PGA generally consists of an operational amplifier, an instrumentation amplifier or an isolated discharger, and some other additional circuits. The working principle of the programmable gain amplifier is that the amplification factor of the amplifier is adjusted by adjusting the numerical value of the feedback resistor switched on by the multiplexer switch through a program. Usually, the instrument amplifier adopts two stages of amplifying circuits, the first stage adopts a homodromous parallel differential amplifier, and the second stage adds a primary basic differential amplifier, so as to form the instrument amplifier. The high-impedance high-voltage input can be realized by changing an additional circuit, the common-mode rejection capability is strong, the gain adjustment is convenient, and the advantages of small voltage vector adjustment and temperature drift and the like are realized due to the symmetrical structure.
In an embodiment of the present application, the present invention further includes a signal frequency monitoring unit and a filter selecting unit (not shown in the figure); the signal frequency monitoring unit is used for monitoring the received and transmitted signal frequency and transmitting a control instruction to the filter selecting unit according to a monitoring result; the filter selection unit switches the band pass filter 401 corresponding to the appropriate frequency according to the command.
In the above embodiment, because different band pass filters have different advantages for filtering of different frequency bands, the filters used are selected by adaptive adjustment according to the frequency of the monitored signal, so that the signal processing is more efficient, and the signal is guaranteed to have a better filtering effect.
In an embodiment of the present application, as shown in fig. 2, the present application further includes a pre-filter 201, and the pre-filter is disposed between the millimeter wave antenna 10 and the LNA unit 302.
In the above embodiment, by providing the pre-filter 201, after the signal is received by the antenna in the receiving processing chain, the signal is further filtered by the pre-filter 201 first, and then goes to the LNA unit 302 for signal amplification, which ensures that the signal is relatively clean between the signal amplifications, and reduces the signal processed by the following amplifier and filter (which filters out a part of clutter and noise), thereby reducing the working strength of the amplifier and filter.
In an embodiment of the present application, the antenna further includes a channel switching unit (not shown in the figure), where the channel switching unit is disposed at a rear end of the antenna and is configured to switch connections between the receiving processing chain and the transmitting processing chain and the antenna.
In the above embodiment, the channel switching unit performs channel switching between the receiving processing link and the transmitting processing link to communicate with the antenna, so that when a signal needs to be transmitted, the antenna can be disconnected from the receiving processing link, thereby avoiding loop interference of the signal.
In an embodiment of the present application, a millimeter wave processing apparatus is further disclosed, as shown in fig. 3, the receiving processing link is sequentially composed of a millimeter wave antenna 10, an LNA unit 302, a duplex filtering unit 202, an RF analog-to-digital conversion module 502, and a BBU module 60, where the millimeter wave antenna 10 is configured to receive a millimeter wave signal, and is amplified by the LNA unit 302; the duplex filtering unit 202 is configured to filter the amplified millimeter wave signal; an RF analog-to-digital conversion module 502, configured to receive and process the filtered millimeter wave signal, and output a digital millimeter wave signal; the BBU module 60 is configured to receive the digital millimeter wave signal and perform corresponding processing;
the transmission processing link comprises the BBU module 60, the digital-to-analog conversion module, the PA unit 301, the duplex filtering unit 202, and the millimeter wave antenna 10 in sequence, wherein the BBU module 60 is configured to receive and process a baseband signal and transmit the baseband signal to the RF digital-to-analog conversion module 501; the RF digital-to-analog conversion module 501 is configured to convert the baseband signal into a transmission radio frequency signal, and transmit the transmission radio frequency signal to the PA unit 301; the PA unit 301 is configured to amplify the transmit rf signal and transmit the amplified transmit rf signal to the duplex filtering unit 202; the duplex filtering unit 202 filters the amplified transmission rf signal, and transmits the filtered transmission rf signal to the millimeter wave antenna 10 for signal transmission.
In the above embodiment, by removing the RF processing unit 40 and using the modules in the digital-to-analog processing unit 50 directly, the RF analog-to-digital conversion module 502(RF-ADC) and the RF digital-to-analog conversion module 501(RF-ADC) perform signal processing by means of direct RF sampling, and directly sample the digital signal into the RF signal for transmission and reception, currently, the sampling rate of the ADC is already above 6.4GS/s, and due to the improvement of these performances, the converter can directly digitize the RF frequency signal and provide a sufficient dynamic range for the millimeter wave communication devices and systems. Meanwhile, the system is further simplified, because in the signal processing process, in theory, the more nodes pass through, the lower the processing efficiency is, and each node generates a certain time delay, therefore, through the simplified structure of the application, on one hand, the improved signal processing efficiency is realized, the use of components in the signal processing efficiency is reduced, the volume is smaller, on the other hand, the time delay of the signal is smaller, and the real-time performance of signal processing is improved.
In an embodiment of the present application, a unidirectional isolator (not shown) is further included, and the unidirectional isolator is disposed between the PA unit 301 and the millimeter wave antenna 10, and is used for isolating signals received by the millimeter wave antenna 10 from being transmitted from the antenna to the transmission processing link.
In the above embodiment, when a signal is turned off, since the transmission processing link processes an on state during transmission, and at this time, when the antenna receives a signal, the signal is transmitted in a reverse direction through the link, thereby causing loop crosstalk of the signal, and therefore, by providing the unidirectional isolator, signal transmission of the transmission processing link is further ensured, and the loop crosstalk of the signal is prevented.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The millimeter wave processing apparatus provided by the present invention is introduced in detail, and a specific example is applied in the text to explain the principle and the implementation of the present invention, and the description of the above example is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A millimeter wave processing apparatus, comprising:
the receiving processing link comprises a millimeter wave antenna for receiving millimeter wave signals and an LNA unit for amplifying the millimeter wave signals; the duplex filtering unit is used for filtering the amplified millimeter wave signals; the radio frequency processing unit is used for receiving, processing and filtering the millimeter wave signals and converting the millimeter wave signals into radio frequency millimeter wave signals; the digital-to-analog processing unit is used for receiving the radio frequency millimeter wave signal and converting the radio frequency millimeter wave signal into a digital millimeter wave signal; the BBU module is used for receiving the digital millimeter wave signal and carrying out corresponding processing;
the sending processing link comprises the BBU module and is used for receiving and processing a baseband signal and sending the baseband signal to the digital-analog processing unit; the digital-to-analog processing unit is used for converting the baseband signal into an analog signal and sending the analog signal to the radio frequency processing unit; the radio frequency processing unit is used for converting the analog signal into a sending radio frequency signal and sending the sending radio frequency signal to the PA unit; the PA unit is used for amplifying the sending radio frequency signal and sending the sending radio frequency signal to the duplex filtering unit; and the duplex filtering unit filters the amplified transmission radio frequency signal and transmits the filtered transmission radio frequency signal to the millimeter wave antenna for signal transmission.
2. The apparatus of claim 1, wherein the duplex filtering unit comprises a first filtering module for providing received signal filtering in the receive processing chain and a second filtering module for providing transmitted signal filtering in the transmit processing chain, wherein the first filtering module and the second filtering module are independent filtering modules isolated from each other.
3. The apparatus according to claim 1, wherein the RF processing unit includes an RF receiving chain belonging to the receiving processing chain, and the RF receiving chain is composed of a band pass filter, an RF amplifier, a mixer, an IF amplifier, an IQ demodulator, and a low pass filter in sequence according to a signal transmission direction, wherein the mixer is further connected with a UFH local oscillator for providing a UFH local oscillator signal thereto, the IQ demodulator has a first I channel and a first Q channel, and the VFH local oscillator provides a VFH local oscillator signal with a phase difference of 90 ° for the first I channel and the first Q channel; wherein the band pass filter is connected to the LNA unit; the first I channel and the first Q channel are respectively connected with a DAC module of the digital-to-analog processing unit through the low-pass filter;
the radio frequency processing unit further comprises a radio frequency transmission link belonging to the transmission processing link, wherein the radio frequency transmission link is sequentially composed of the low-pass filter, an IQ modulator, an IF amplifier, the mixer, the RF amplifier and the band-pass filter according to a signal transmission direction, wherein the mixer is connected with the UFH local oscillator for providing UFH local oscillator signals for the mixer, the IQ modulator has a second I channel and a second Q channel, and the VFH local oscillator provides VFH local oscillator signals with a phase difference of 90 ° for the second I channel and the second Q channel; wherein the band pass filter provides millimeter wave signals to the PA unit; the second I channel and the second Q channel are respectively connected to an ADC module of the digital-to-analog processing unit through the low-pass filter.
4. The apparatus of claim 3, wherein the band pass filter comprises a SAW filter, a BAR filter, and a BAW filter.
5. The apparatus of claim 1, wherein the IF amplifier is a programmable gain amplifier.
6. The apparatus of claim 1, further comprising a pre-filter disposed between the millimeter-wave antenna and the LNA unit.
7. The apparatus of claim 1, further comprising a channel switching unit, disposed at a rear end of the antenna, for switching connection between the receiving processing chain and the transmitting processing chain and the antenna.
8. The apparatus of claim 4, further comprising a signal frequency listening unit and a filter selecting unit;
the signal frequency monitoring unit is used for monitoring the received and transmitted signal frequency and transmitting a control instruction to the filter selection unit according to a monitoring result;
the filter selection unit is used for cutting the band-pass filter corresponding to the suitable frequency according to the instruction.
9. A millimeter wave processing apparatus, comprising: the receiving processing link comprises a millimeter wave antenna for receiving millimeter wave signals and an LNA unit for amplifying the millimeter wave signals; the duplex filtering unit is used for filtering the amplified millimeter wave signals; the RF analog-to-digital conversion module is used for receiving and processing the millimeter wave signals after filtering and outputting digital millimeter wave signals; the BBU module is used for receiving the digital millimeter wave signal and carrying out corresponding processing;
the transmission processing link comprises the BBU module and is used for receiving and processing a baseband signal and transmitting the baseband signal to the RF digital-to-analog conversion module; the RF digital-to-analog conversion module is used for converting the baseband signal into a transmission radio frequency signal and transmitting the transmission radio frequency signal to the PA unit; the PA unit is used for amplifying the sending radio frequency signal and sending the sending radio frequency signal to the duplex filtering unit; and the duplex filtering unit filters the amplified transmission radio frequency signal and transmits the filtered transmission radio frequency signal to the millimeter wave antenna for signal transmission.
10. The apparatus of claim 9, further comprising a unidirectional isolator disposed between the PA unit and the millimeter-wave antenna for isolating signals received by the millimeter-wave antenna from passing from the antenna into the transmit processing chain.
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