Multifunctional dual-mode digital signal processing hardware module for cellular communication systems

Abstract

The utility model relates to the field of cellular communication technology, specifically to a multifunctional dual-mode digital signal processing hardware module of a cellular communication system, including a digital signal processing module with a 4-antenna dual-mode 2×MIMO structure, each antenna having a complete T / R unit, including a radio frequency circuit and respective analog-to-digital conversion ADC and digital-to-analog conversion DAC units, which has the following beneficial effects: High flexibility: supports dual-mode 2×MIMO structure, can switch between internal antenna and external antenna according to actual needs, effectively improving system flexibility. High performance: each T / R unit is equipped with a high-gain PA and ATT chip to ensure excellent signal transmission and reception performance. Strong clock synchronization capability: supports local and external clock synchronization to ensure collaborative work between multiple devices in the system. High-speed data transmission: equipped with up to 4 SFP photoelectric conversion modules, supports high-speed digital signal transmission and can adjust the transmission rate to meet different needs.

Description

Technical Field

[0001] The utility model relates to the technical field of cellular communication, in particular to a multifunctional dual-mode digital signal processing hardware module of a cellular communication system. Background Art

[0002] Cellular mobile communication system is the most commonly used wireless communication system in human life. It has developed to the fifth generation and is still evolving. Existing RRU, digital fiber repeater and other equipment usually adopts exclusive design, which has a compact structure and small size, but also loses flexibility. Especially in the digital fiber repeater system with changing requirements, it is often necessary to use different power amplifiers, power supplies and antenna modules according to the use environment, and conventional designs are difficult to be flexible. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies of the prior art, the utility model provides a multifunctional dual-mode digital signal processing hardware module for a cellular communication system.

[0005] (II) Technical solution

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a multifunctional dual-mode digital signal processing hardware module for a cellular communication system, including a digital signal processing module with a 4-antenna dual-mode 2×MIMO structure, each antenna having a complete T / R unit, including a radio frequency circuit and respective analog-to-digital conversion ADC and digital-to-analog conversion DAC units, the transmitting part of the radio frequency circuit is equipped with a power amplifier PA with an output power of 250mW, and a corresponding gain amplifier, the receiving part of the radio frequency circuit has a 30dB signal gain and an attenuator ATT chip for realizing an automatic gain control AGC function, and each antenna is also equipped with a switchable switch for selecting to use an internal antenna or an external antenna.

[0007] Preferably, the four groups of T / R units are connected to a field programmable gate array FPGA responsible for digital signal processing and digital information transmission protocol processing.

[0008] Preferably, the digital signal processing module further includes a clock synchronization circuit having a local clock synchronization function and an external clock synchronization function.

[0009] Preferably, the digital signal processing module further includes four SFP photoelectric conversion modules for photoelectric conversion of high-speed digital signals.

[0010] (III) Beneficial effects

[0011] Compared with the prior art, the utility model provides a multifunctional dual-mode digital signal processing hardware module for a cellular communication system, which has the following beneficial effects:

[0012] The multifunctional dual-mode digital signal processing hardware module of the cellular communication system is highly flexible: it supports a dual-mode 2×MIMO structure and can switch between internal and external antennas according to actual needs, effectively improving system flexibility.

[0013] High performance: Each T / R unit is equipped with high-gain PA and ATT chips to ensure excellent signal transmission and reception performance.

[0014] Strong clock synchronization capability: supports local and external clock synchronization to ensure collaborative work between multiple devices in the system.

[0015] High-speed data transmission: Equipped with up to 4 SFP photoelectric conversion modules, it supports high-speed digital signal transmission and can adjust the transmission rate to meet different needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the internal system block diagram of the digital signal processing module of the utility model structure;

[0017] Figure 2 This is the overall structural layout diagram of the digital signal processing module of the utility model;

[0018] Figure 3 This is the system block diagram of the low-power indoor unit of the utility model;

[0019] Figure 4 This is the system block diagram of the high-power outdoor unit of the utility model. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-4, a multifunctional dual-mode digital signal processing hardware module for a cellular communication system, including a digital signal processing module with a 4-antenna dual-mode 2×MIMO structure, each antenna having a complete T / R unit, including a radio frequency circuit and respective analog-to-digital conversion ADC and digital-to-analog conversion DAC units, the transmitting part of the radio frequency circuit is equipped with a power amplifier PA with an output power of 250mW, and a corresponding gain amplifier, the receiving part of the radio frequency circuit has a 30dB signal gain and an attenuator ATT chip for realizing an automatic gain control AGC function, each antenna is also equipped with a switchable switch for selecting to use an internal antenna or an external antenna, 4 groups of the T / R units, and are connected to a field programmable gate array FPGA responsible for digital signal processing and digital information transmission protocol processing, the digital signal processing module also includes a clock synchronization circuit with a local clock synchronization function and an external clock synchronization function, and the digital signal processing module also includes 4 SFP photoelectric conversion modules for photoelectric conversion of high-speed digital signals.

[0022] like Figure 1 As shown, the signal flow of digital signal processing is transmitted by other devices such as base station BBU through optical fiber transmission and input into the protocol processing program module of FPGA through SFP optical-electrical conversion module. The processed digital signal flow is sent to the DAC of the corresponding T / R channel through a series of signal processing, such as digital filter, CFR, DPD, etc., and converted into analog signal. After amplification by the RF amplifier circuit of T / R channel, it is sent to the corresponding antenna unit for transmission. It can also be sent from the RF interface of SMA to other RF processing modules for further amplification through the RF switch. Conversely, the analog signal received by the antenna is also sent to ADC for analog-to-digital conversion after being processed by filter amplification and other processes. After being converted into a digital signal stream, it is sent to FPGA, and then processed by the digital signal processor of FPGA and sent to the transmission protocol processing program module. After being converted into optical signal through SFP optical-electrical conversion module, it is transmitted to the upper-level device, such as base station BBU. The transmission protocols mentioned above include but are not limited to CPRI and eCPRI;

[0023] like Figure 2As shown in the figure, the distribution layout of the main components in the digital signal processing module. The AD / DA involved is an integrated RF IC that supports dual-channel MIMO. There is one on each side, forming a dual-mode 2×MIMO 4-antenna signal processing flow channel. That is to say, the 2 T / R channels on the left can run the signal processing of one frequency band, and the right side is independent of the left side, and is also a 2 T / R channel. It can realize dual-mode 2×MIMO and 4×SISO. Through the RF switching switch, the digital board can switch between the built-in antenna and the external antenna at will. The digital protocol handler in the FPGA can cooperate with the clk sync unit to switch multiple protocols, including but not limited to CPRI and eCPRI;

[0024] like Figure 3 As shown, when used as a low-power device, the switch is switched to the built-in antenna, and the low-power amplifier circuit on the board is used to output a maximum power of 250mw (24dBm). It is mainly used as an indoor device to provide small-range signal coverage.

[0025] like Figure 4 As shown, when used as a high-power device, the switch is switched to the SMA connector, and the low-power amplifier circuit on the board is turned off. At this time, a high-power amplifier can be connected externally through the SMA connector. The maximum output power is determined by the gain and power of the external amplifier. It is mainly used as an outdoor device to provide wide-range signal coverage.

[0026] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0027] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0028] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multifunctional dual-mode digital signal processing hardware module for a cellular communication system, characterized in that: It includes a digital signal processing module with a 4-antenna dual-mode 2×MIMO structure. Each antenna has a complete T / R unit, including a radio frequency circuit and respective analog-to-digital conversion ADC and digital-to-analog conversion DAC units. The transmitting part of the radio frequency circuit is equipped with a power amplifier PA with an output power of 250mW, and a corresponding gain amplifier. The receiving part of the radio frequency circuit has a 30dB signal gain and an attenuator ATT chip for realizing the automatic gain control AGC function. Each antenna is also equipped with a switchable switch that can select the use of an internal antenna or an external antenna.

2. The multifunctional dual-mode digital signal processing hardware module of the cellular communication system according to claim 1, characterized in that: The four groups of T / R units are connected to a field programmable gate array FPGA responsible for digital signal processing and digital information transmission protocol processing.

3. The multifunctional dual-mode digital signal processing hardware module of the cellular communication system according to claim 2, characterized in that: The digital signal processing module also includes a clock synchronization circuit with a local clock synchronization function and an external clock synchronization function.

4. The multifunctional dual-mode digital signal processing hardware module of the cellular communication system according to claim 3, characterized in that: The digital signal processing module also includes four SFP photoelectric conversion modules for photoelectric conversion of high-speed digital signals.

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