Multi-carrier received signal processing module, radio remote unit and communication system
By using the splitting and combining processing of the multi-carrier receiving signal processing module, the problem of increased board area and power consumption caused by the excessive number of ADC circuits in the multi-carrier RRU is solved, thereby reducing circuit cost and power consumption and simplifying FPGA interface design.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN HUAZHEN INFORMATION TECH CO LTD
- Filing Date
- 2025-08-07
- Publication Date
- 2026-06-19
AI Technical Summary
In existing multi-carrier RRU receiver links, the use of multiple ADC circuits leads to increased PCB board area, high hardware cost and power consumption, and high IOB requirements for FPGAs.
A multi-carrier receiving signal processing module is adopted, including an RF signal receiving end, an RF filtering and amplification unit, a power divider group, a mixer filtering unit, a combiner group, and an ADC unit. The RF signal is processed by splitting and combining, reducing the number of ADCs and using a single ADC unit for intermediate frequency signal processing.
It reduces PCB layout area, lowers circuit power consumption and cost, and simplifies FPGA interface design, making it easier to platformize.
Smart Images
Figure CN224385504U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of communication technology, and more specifically, to a multi-carrier receiving signal processing module, a radio frequency remote unit, and a communication system. Background Technology
[0002] Narrowband private network communication primarily utilizes PDT (Professional Digital Trunking) / TETRA (Terrestrial Trunked Radio) technologies. With the increasing demand for private network communication services, single-base station RRUs (Remote Radio Units) have gradually transitioned from single-carrier to multi-carrier designs in recent years. While this brings convenience, it also presents significant challenges to RRU link design. Unlike public network base stations, private network base stations do not support uplink power control mechanisms. This means that regardless of the communication distance between the private network terminal and the base station, all private network terminals transmit at maximum power during actual communication. This results in extremely high requirements for the anti-blocking capabilities of the private network RRU receiving link.
[0003] Due to the extremely high blocking requirements of the private network RRU receive link, the protocol requires a minimum blocking rate of 84dB. To ensure product competitiveness, communication equipment manufacturers actually design for a minimum blocking rate of 90dB. For multi-carrier RRU receive links, the in-band blocking requirement is the same. Currently, for multi-carrier RRUs, a separate ADC circuit is typically used for each carrier to ensure the in-band blocking requirement. Using multiple ADC circuits increases PCB area and hardware costs; moreover, multiple ADCs need to be connected to the subsequent FPGA for signal processing, placing high IOB requirements on the FPGA; furthermore, multiple ADCs require multiple reference clocks and multiple power supplies, leading to increased power consumption of the entire circuit. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide a multi-carrier receiving signal processing module, a radio frequency remote unit and a communication system, which address the above-mentioned technical defects of the prior art.
[0005] Firstly, the technical solution adopted by this utility model to solve its technical problem is: to construct a multi-carrier receiving signal processing module, including: a radio frequency signal receiving end, a radio frequency filtering and amplification unit, a power divider group including several power dividers, several mixing and filtering units, a combiner group including several combiners, and an ADC unit.
[0006] The radio frequency filtering and amplification unit is connected to the radio frequency signal receiving end and is used to filter and amplify the radio frequency signal received by the radio frequency signal receiving end.
[0007] The power divider group is connected to the radio frequency filtering and amplification unit and the mixing and filtering unit, and is used to sequentially split the radio frequency signal to obtain several sub-radio frequency signals and input them to the corresponding mixing and filtering units respectively.
[0008] The mixing and filtering units are respectively used to perform mixing and filtering on the corresponding sub-radio frequency signals to obtain sub-intermediate frequency signals;
[0009] The combiner group connects several of the mixing and filtering units and the ADC unit, and is used to combine several of the sub-IF signals sequentially to obtain the IF signal corresponding to the RF signal.
[0010] The ADC unit is used for intermediate frequency signal processing of the intermediate frequency signal.
[0011] Preferably, in the multi-carrier receiving signal processing module of this utility model, the power divider group includes a first power divider and a plurality of second power dividers;
[0012] The input terminal of the first power divider is connected to the radio frequency filter and amplification unit, and the output terminal of the first power divider is connected to the input terminal of a second power divider.
[0013] The output of the second power divider is connected to a corresponding mixing and filtering unit.
[0014] Preferably, in the multi-carrier receiving signal processing module of this utility model, the first power divider is a two-way power divider, and / or the second power divider is a two-way power divider.
[0015] Preferably, in the multi-carrier receiving signal processing module of this utility model, the combiner group includes a plurality of first combiners and a second combiner;
[0016] The input terminals of the first combiner are respectively connected to the corresponding mixing and filtering units, the output terminals of the first combiner are respectively connected to the input terminals of the second combiner, and the output terminals of the second combiner are connected to the input terminals of the ADC unit.
[0017] Preferably, in the multi-carrier receiving signal processing module of this utility model, the first combiner is a two-in-one combiner, and / or the second combiner is a two-in-one combiner.
[0018] Preferably, in the multi-carrier receiving signal processing module of this utility model, the radio frequency filtering and amplification unit includes a cavity filter circuit, a radio frequency limiting circuit, a low noise amplification circuit, a radio frequency gain control circuit, a radio frequency filter circuit, and a radio frequency amplification circuit connected in sequence.
[0019] The cavity filter circuit is connected to the radio frequency signal receiving unit, and the radio frequency amplifier circuit is connected to the power divider group.
[0020] Preferably, in the multi-carrier receiving signal processing module of this utility model, each of the mixing and filtering units includes a mixing circuit, a local oscillator driving circuit and an intermediate frequency filtering circuit.
[0021] The first end of the mixer circuit is connected to the power divider group, the second end of the mixer circuit is connected to the local oscillator drive circuit, and the output end of the mixer circuit is connected to the intermediate frequency filter circuit, and is connected to the combiner group through the intermediate frequency filter circuit.
[0022] Different local oscillator driving circuits are used to generate local oscillator signals with different frequencies.
[0023] Preferably, in the multi-carrier receiving signal processing module of this utility model, the ADC unit includes an ADC circuit and an intermediate frequency amplifier circuit;
[0024] The intermediate frequency signal output by the combiner group is amplified by the intermediate frequency amplifier circuit and then input to the ADC circuit for processing to obtain a digital signal.
[0025] Secondly, the radio frequency remote unit of this utility model includes the multi-carrier receiving signal processing module described above.
[0026] Thirdly, the present invention provides a communication system including the above-mentioned radio frequency remote unit and an antenna, wherein the antenna is connected to the radio frequency signal receiving end of the radio frequency remote unit.
[0027] The multi-carrier receiving signal processing module, radio frequency remote unit and communication system of this utility model have the following beneficial effects: they can reduce the PCB layout in related circuits, reduce circuit power consumption and reduce the overall circuit cost. Attached Figure Description
[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:
[0029] Figure 1 This is a schematic diagram of the structure of an embodiment of the multi-carrier receiving signal processing module of this utility model;
[0030] Figure 2 This is a schematic diagram of another embodiment of the multi-carrier receiving signal processing module of this utility model. Detailed Implementation
[0031] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0032] like Figure 1 As shown, an embodiment of the multi-carrier receiving signal processing module of this utility model is illustrated. Figure 1 In the embodiment of the multi-carrier receiving signal processing module of this utility model shown, the multi-carrier receiving signal processing module includes an RF signal receiving end 110, an RF filtering and amplification unit 120, a power divider group 130 containing several power dividers, several mixing and filtering units 140, a combiner group 150 containing several combiners, and an ADC unit 160; the RF filtering and amplification unit 120 is connected to the RF signal receiving end 110 and is used to filter and amplify the RF signal received by the RF signal receiving end 110; the power divider group 130 is connected to the RF filtering and amplification unit 120. The RF signal and the mixing and filtering unit 140 are used to sequentially split the RF signal to obtain several sub-RF signals and input them to the corresponding mixing and filtering unit 140 respectively; the mixing and filtering unit 140 is used to perform mixing and filtering on the corresponding sub-RF signals to obtain sub-IF signals; the combiner group 150 connects several mixing and filtering units 140 and the ADC unit 160, and is used to sequentially combine several sub-IF signals to obtain the IF signal corresponding to the RF signal; the ADC unit 160 is used to perform IF signal processing on the IF signal.
[0033] Specifically, the radio frequency (RF) signal corresponding to the multi-carrier signal enters the processing module through the RF signal receiver 110 for RF signal processing. The RF filtering and amplification unit 120 is connected to the RF signal receiver 110, allowing the RF signal input through the receiver 110 to be fed into the RF filtering and amplification unit 120, which then filters and amplifies the RF signal. It can be understood that the RF signal remains an RF signal after processing by the RF filtering and amplification unit 120; the processing reduces noise and adjusts the signal strength to meet the requirements of subsequent circuit processing.
[0034] The power divider group 130 contains several power dividers, which are radio frequency (RF) power dividers. These power dividers sequentially split the RF signal output from the RF filter amplifier unit 120, dividing a single input RF signal into several sub-RF signals. The number of sub-RF signals corresponds to the number of carrier waves; each sub-RF signal can be understood as corresponding to one carrier wave. The power of each sub-RF signal varies relative to the RF signal output from the RF filter amplifier unit 120, but its frequency may remain unchanged. The process of combining the power divider group 130 into the power divider group 130 can be configured according to actual needs, ensuring that a single RF signal input can be divided into several sub-RF signals that meet the quantity and power requirements.
[0035] The number of mixing and filtering units 140 can be set according to the number of carriers. Simply put, the number of mixing and filtering units 140 is the same as the number of sub-RF signals. Each sub-RF signal is mixed and filtered by its corresponding mixing and filtering unit 140 to obtain the corresponding sub-IF signal. Each sub-IF signal corresponds to one carrier.
[0036] The combiner group 150 comprises several combiners, specifically intermediate frequency (IF) combiners. These combiners sequentially combine the sub-IF signals, ultimately merging multiple input sub-IF signals into a single IF signal. It can be understood that the IF signal obtained after merging by the combiner group 150 contains the IF signals corresponding to all carriers. The process of combining multiple combiner groups 150 into the combiner group 150 can be configured according to actual needs. The goal is to ensure that multiple input sub-IF signals can be combined into a single IF signal that meets the requirements.
[0037] The final intermediate frequency (IF) signal can be processed by the ADC unit 160 to obtain the final baseband signal. This completes the entire received signal processing process. This embodiment reduces the number of ADCs. Furthermore, different frequencies can be set for each sub-IF signal, allowing each carrier to use a different IF point, making separation easier in the digital domain and increasing carrier isolation. Moreover, by using a single ADC unit 160, increasing the number of carriers based on this receiver module does not affect the ADC unit 160 hardware, allowing the interface design between the ADC unit 160 and the FPGA to remain unchanged, facilitating platformization of the receiver module.
[0038] In one embodiment, such as Figure 2As shown, the power divider group 130 includes a first power divider 131 and several second power dividers 132. The input terminal of the first power divider 131 is connected to the radio frequency filter amplification unit 120, and the output terminal of the first power divider 131 is connected to the input terminal of each of the second power dividers 132. The output terminals of the second power dividers 132 are connected to a corresponding mixing filter unit 140. Specifically, the power divider group 130 can adopt a two-level design, that is, the first power divider 131 performs preliminary splitting of the radio frequency signal to obtain a first-level split signal, and the second power dividers 132 perform further splitting to obtain the required sub-radio frequency signals, which are then output to the corresponding mixing filter units 140. The number of second power dividers 132 can be set as needed. In other embodiments, the power divider group 130 can adopt a more multi-level design to perform multi-level splitting to obtain the required sub-radio frequency signals.
[0039] In one specific embodiment, the first power divider 131 can be a two-way power divider, that is, the first power divider 131 splits the radio frequency signal into two radio frequency signals, and the second power divider 132 further splits these two radio frequency signals. In another embodiment, the second power divider 132 can also be a two-way power divider, that is, the second power divider 132 splits the output of the first power divider 131 into two sub-radio frequency signal outputs. In one specific embodiment, when the number of carriers is 4, the power divider group 130 can be configured to include one first power divider 131 and two second power dividers 132, where both the first power divider 131 and the second power divider 132 are two-way power dividers.
[0040] In one embodiment, the combiner group 150 includes a plurality of first combiners 151 and a second combiner 152; the input terminals of the first combiners 151 are respectively connected to the corresponding mixing and filtering units 140, the output terminals of the first combiners 151 are respectively connected to the input terminals of the second combiners 152, and the output terminals of the second combiners 152 are connected to the input terminals of the ADC unit 160. Specifically, the combiner group 150 can adopt a two-level design, that is, the first combiners 151 perform preliminary combining of the sub-IF signals to obtain a first-level combined signal, and the second combiner 152 performs further combining to combine the first-level combined signal again to obtain the required IF signal and output it to the ADC unit 160. The number of first combiners 151 can be set as needed. In other embodiments, the combiner group can adopt a more multi-level design to combine a plurality of sub-IF signals to obtain the required IF signal.
[0041] In one specific embodiment, the first combiner 151 can be a two-in-one combiner, that is, the first combiner 151 combines two sub-IF signals into one, and the outputs of multiple first combiners 151 are further combined by a second combiner 152. In another embodiment, the second combiner 152 can be a two-in-one combiner, that is, the second combiner 152 combines the outputs of the first combiners 151 into one, thus obtaining the IF signal output. In one specific embodiment, when the number of carriers is 4, the combiner group 150 can be configured to include two first combiners 151 and one second combiner 152, where both the first combiner 151 and the second combiner 152 are two-in-one combiners.
[0042] In one embodiment, the RF filtering and amplification unit 120 includes a cavity filter circuit 121, an RF clipping circuit 122, a low-noise amplifier circuit 123, an RF gain control circuit 124, an RF filter circuit 125, and an RF amplifier circuit 126 connected in cascade. The cavity filter circuit 121 is connected to the RF signal receiving unit, and the RF amplifier circuit 126 is connected to the power divider group 130. Specifically, in the RF filtering and amplification unit 120, the RF signal input through the RF signal receiving unit first enters the cavity filter circuit 121, and is then processed sequentially by the cavity filter circuit 121, the RF clipping circuit 122, the low-noise amplifier circuit 123, the RF gain control circuit 124, the RF filter circuit 125, and the RF amplifier circuit 126. The cavity filter circuit 121 can set its filtering parameters according to the operating frequency band of the RF signal. This process can refer to the design process of currently available cavity filter circuits 121. Similarly, the RF limiting circuit 122, low-noise amplifier circuit 123, RF gain control circuit 124, RF filter circuit 125, and RF amplifier circuit 126 can all have their specific operating parameters set according to the operating frequency band of the RF signal and actual operating requirements. The specific process can refer to the currently mature circuit design process, and is not limited here. The final RF signal is input to the power divider group 130 at the output terminal of the RF amplifier circuit 126.
[0043] In one embodiment, each of the mixing and filtering units 140 includes a mixing circuit 141, a local oscillator driving circuit 142, and an intermediate frequency (IF) filter circuit 143. The first terminal of the mixing circuit 141 is connected to the power divider group 130, the second terminal of the mixing circuit 141 is connected to the local oscillator driving circuit 142, and the output terminal of the mixing circuit 141 is connected to the IF filter circuit 143, and then connected to the combiner group 150 through the IF filter circuit 143. Different local oscillator driving circuits 142 are used to generate local oscillator signals with different frequencies. Specifically, the local oscillator driving circuit 142 generates a local oscillator signal, and the sub-RF signal is mixed with the local oscillator signal through the mixing circuit 141 to obtain the corresponding sub-IF signal. The different frequencies of the local oscillator signals generated by the different local oscillator driving circuits 142 result in different sub-IF signals obtained after the sub-RF signal is mixed with different local oscillator signals through the mixing circuit 141. The operating parameters of the mixer circuit 141 and the local oscillator drive circuit 142 can be set according to specific design needs. The specific processes can refer to currently mature circuit design procedures and are not limited here. The obtained sub-IF signal can be filtered by the corresponding IF filter circuit 143 and then input to the combiner group 150. The IF filter circuit 143 includes an IF surface acoustic wave (SAW) filter and an IF gain control circuit. The design process of the IF SAW filter and the IF gain control circuit can refer to currently mature circuit design procedures and is not limited here. Based on this process, the IF frequencies of different carriers are different after frequency conversion by the mixer. Multiple narrowband IF SAWs with different center frequencies and sufficiently large frequency intervals are used for narrowband frequency selection. This ensures that the different IF signals are combined after being filtered by the IF SAWs. Because the IF frequencies of different carriers are inconsistent and the frequency intervals are sufficiently large, the signal-to-noise ratio of each carrier will not deteriorate after combining.
[0044] In one embodiment, the ADC unit 160 includes a wideband ADC circuit 162 and an intermediate frequency (IF) amplifier circuit 161. The IF signal output from the combiner group 150 is amplified by the IF amplifier circuit 161 and then input to the ADC circuit 162 for processing to obtain a digital signal. Specifically, both the IF amplifier circuit 161 and the ADC circuit 162 are wideband circuits. The IF signal is amplitude-adjusted by the IF amplifier circuit 161 and then sent to the ADC circuit 162, whereby the ADC circuit 162 processes each sub-IF signal to obtain the corresponding digital signal. This can be understood as obtaining the baseband signals corresponding to multiple carriers. Both the ADC circuit 162 and the IF amplifier circuit 161 can refer to currently mature circuit design processes and are not limited here.
[0045] Furthermore, the radio frequency remote unit of this invention includes the aforementioned multi-carrier receiving signal processing module. That is, in the RRU module (corresponding to the radio frequency remote unit), the receiving link implements the receiving signal processing process through the aforementioned multi-carrier receiving signal processing module to achieve data receiving processing.
[0046] Furthermore, the communication system of this utility model includes the aforementioned radio frequency remote unit and antenna, wherein the antenna is connected to the radio frequency signal receiving end 110 of the radio frequency remote unit. That is, in the communication system, an antenna is connected to the RRU module, and the antenna receives signals from external devices input to the radio frequency signal receiving end 110 of the RRU module. The RRU's radio frequency signal receiving end 110 can also be understood as the radio frequency signal receiving end 110 of the corresponding multi-carrier receiving signal processing module. Simultaneously, the communication signal may also include a baseband signal processing unit connected to the RRU module to realize the final data processing process and complete the entire data reception.
[0047] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.
Claims
1. A multi-carrier received signal processing module, characterized by, include: The radio frequency signal receiving end, radio frequency filtering and amplification unit, power divider group containing several power dividers, several mixing and filtering units, combiner group containing several combiners, and ADC unit; The radio frequency filtering and amplification unit is connected to the radio frequency signal receiving end and is used to filter and amplify the radio frequency signal received by the radio frequency signal receiving end. The power divider group is connected to the radio frequency filtering and amplification unit and the mixing and filtering unit, and is used to sequentially split the radio frequency signal to obtain several sub-radio frequency signals and input them to the corresponding mixing and filtering units respectively. The mixing and filtering units are respectively used to perform mixing and filtering on the corresponding sub-radio frequency signals to obtain sub-intermediate frequency signals; The combiner group connects several of the mixing and filtering units and the ADC unit, and is used to combine several of the sub-IF signals sequentially to obtain the IF signal corresponding to the RF signal. The ADC unit is used for intermediate frequency signal processing of the intermediate frequency signal.
2. The multi-carrier receiving signal processing module according to claim 1, characterized in that, The power divider group includes a first power divider and several second power dividers; The input terminal of the first power divider is connected to the radio frequency filter and amplification unit, and the output terminal of the first power divider is connected to the input terminal of a second power divider. The output of the second power divider is connected to a corresponding mixing and filtering unit.
3. The multi-carrier receiving signal processing module according to claim 2, characterized in that, The first power divider is a two-way power divider, and / or the second power divider is a two-way power divider.
4. The multi-carrier receiving signal processing module according to claim 1, characterized in that, The combiner group includes several first combiners and a second combiner; The input terminals of the first combiner are respectively connected to the corresponding mixing and filtering units, the output terminals of the first combiner are respectively connected to the input terminals of the second combiner, and the output terminals of the second combiner are connected to the input terminals of the ADC unit.
5. The multi-carrier receiving signal processing module according to claim 4, characterized in that, The first combiner is a two-in-one combiner, and / or the second combiner is a two-in-one combiner.
6. The multi-carrier receiving signal processing module according to claim 1, characterized in that, The radio frequency filtering and amplification unit includes a cavity filter circuit, a radio frequency limiting circuit, a low noise amplification circuit, a radio frequency gain control circuit, a radio frequency filter circuit, and a radio frequency amplification circuit, which are connected in sequence. The cavity filter circuit is connected to the radio frequency signal receiving unit, and the radio frequency amplifier circuit is connected to the power divider group.
7. The multi-carrier receiving signal processing module according to claim 1, characterized in that, Each of the aforementioned mixing and filtering units includes a mixing circuit, a local oscillator driving circuit, and an intermediate frequency filtering circuit; The first end of the mixer circuit is connected to the power divider group, the second end of the mixer circuit is connected to the local oscillator drive circuit, and the output end of the mixer circuit is connected to the intermediate frequency filter circuit, and is connected to the combiner group through the intermediate frequency filter circuit. Different local oscillator driving circuits are used to generate local oscillator signals with different frequencies.
8. The multi-carrier receiving signal processing module according to claim 7, characterized in that, The ADC unit includes an ADC circuit and an intermediate frequency amplifier circuit; The intermediate frequency signal output by the combiner group is amplified by the intermediate frequency amplifier circuit and then input to the ADC circuit for processing to obtain a digital signal.
9. A radio frequency remote unit, characterized in that, Includes the multi-carrier receiving signal processing module as described in any one of claims 1 to 8.
10. A communication system, characterized in that, It includes the radio frequency remote unit as described in claim 9 and an antenna, wherein the antenna is connected to the radio frequency signal receiving end of the radio frequency remote unit.