CN210380855U

CN210380855U - Low-cost optical fiber distribution system

Info

Publication number: CN210380855U
Application number: CN201921591205.6U
Authority: CN
Inventors: 任恩贤; 宋胜东
Original assignee: Shenzhen Jiaxian Communication Equipment Co ltd
Current assignee: Shenzhen Jiaxian Communication Technology Co ltd
Priority date: 2019-09-23
Filing date: 2019-09-23
Publication date: 2020-04-21
Anticipated expiration: 2029-09-23

Abstract

The utility model discloses a low-cost optic fibre distribution system, including main unit, extension unit and distal end unit, its characterized in that, the main unit includes: LNA module, PA module, FPGA chip, Transceiver module and SFP module. The FPGA chip comprises a CPRI frame sealing module and a CPRI frame decoding module; the Transceiver module comprises a receiving module and a transmitting module and is used for converting the air interface signal and the baseband signal to each other; the receiving module is connected with the LNA module and the CPRI frame-sealing module and is used for converting an air interface signal received by the LNA module into a baseband signal; the CPRI frame encapsulating module is connected with the receiving module and the SFP module and is used for encapsulating the baseband signal into a CPRI frame; and the CPRI frame decoding module is connected with the transmitting module and the SFP module and is used for converting CPRI frames into radio frequency signals.

Description

Low-cost optical fiber distribution system

Technical Field

The utility model relates to the field of communication technology, especially, relate to a low-cost optical fiber distribution system.

Background

The optical fiber distribution system is an extension of indoor and outdoor coverage of a mobile network in a building, and is also one of important means for improving the coverage width and depth of the network, absorbing indoor and outdoor telephone traffic and improving the network quality and service quality.

With the gradual increase of the requirement of users on the service quality, the cost pressure of operators is also increasing, so how to be compatible with multiple standards on the premise of controllable cost becomes urgent to perfect the signal coverage quality. The existing scheme on the market generally has the problems of high equipment cost and the like, so that the production cost and the maintenance cost are high.

How to solve the above problems is a problem to be solved urgently in the field.

SUMMERY OF THE UTILITY MODEL

The utility model provides a low-cost optical fiber distribution system aims at solving the problem that current optical fiber distribution system is with high costs.

According to the embodiment of the application, a low-cost optical fiber distribution system comprises a main unit, an expansion unit and a remote unit, wherein the main unit comprises: the LNA module is used for receiving an air interface signal; the PA module is used for transmitting a radio frequency signal; the FPGA chip comprises a CPRI frame sealing module and a CPRI frame de-sealing module and is used for sealing the baseband signal into a CPRI frame and de-sealing the electric signal into the CPRI frame; the SFP module is connected with the FPGA chip and the optical fiber; the device is used for converting the electric signal into CPRI frames; the Transceiver module comprises a receiving module and a transmitting module and is used for converting the air interface signal and the baseband signal to each other; the receiving module is connected to the LNA module and the CPRI framing module, and is configured to convert an air interface signal received by the LNA module into a baseband signal; the CPRI frame encapsulating module is connected with the receiving module and the SFP module and is used for encapsulating the baseband signal into a CPRI frame; the CPRI frame decoding module is connected with the transmitting module and the SFP module and used for converting the CPRI frame into a radio frequency signal.

In the low-cost optical fiber distribution system of the present invention, the extension unit and the remote unit have a mesh connection structure therebetween.

The utility model discloses an among the low-cost optic fibre distribution system, the FPGA chip include with the weighting compression module of baseband signal compression.

The utility model discloses an among the low-cost optical fiber distribution system, the FPGA chip does.

In the low-cost fiber distribution system of the present invention, the SFP module is a 3.072Gbps optical module.

The technical scheme provided by the embodiment of the application can have the following beneficial effects: the application designs a low-cost distribution system of optic fibre, optic fibre distribution system can reduce optic fibre distribution system's cost including having used Transceiver module.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.

Fig. 1 is a schematic structural diagram of a low-cost optical fiber distribution system according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a main unit of an embodiment of the present invention;

fig. 3 is a schematic diagram of a main unit structure of the conventional art.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in the specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

Referring to fig. 1, the present invention discloses a low-cost optical fiber distribution system, which includes a main unit, an extension unit, and a remote unit, wherein the main unit is connected to the extension unit and adopts a point-to-multipoint mesh structure, or a multipoint-to-multipoint mesh structure. The expansion unit and the remote unit can adopt a one-point-to-multipoint mesh structure or a chain structure, and the connection between the expansion unit and the remote unit is set according to the actual situation.

The information source can be a GSM information source, a TD-SCDMA information source and a TD-LTE information source.

Referring to fig. 2, the main unit includes an LNA module, a PA module, an FPGA chip, an SFP module, and a Transceiver module. The LNA module is used for receiving an air interface signal, and the PA module is used for transmitting a radio frequency signal; the FPGA chip comprises a CPRI frame sealing module and a CPRI frame de-sealing module, and is used for sealing baseband signals into CPRI frames and de-sealing electric signals into CPRI frames, and the SFP module is connected with the FPGA chip and the optical fiber; the Transceiver module comprises a receiving module and a transmitting module, and is used for converting the air interface signal and a baseband signal into each other, wherein the receiving module is connected with the LNA module and the CPRI frame-sealing module, and is used for converting the air interface signal received by the LNA module into the baseband signal; the CPRI frame-sealing module is connected with the receiving module and the SFP module and is used for sealing the baseband signal into a CPRI frame; the CPRI frame decoding module is connected with the transmitting module and the SFP module and used for converting CPRI frames into radio frequency signals. Because the Transceiver integrates a mixer circuit, an ADC, a DAC and a digital filter bank, and the high integration degree of the Transceiver has the advantages of low power consumption and adjustable frequency point, the cost of the system can be reduced, and the market competitiveness of the optical fiber distribution system is enhanced. However, as shown in fig. 3, the conventional technical solution is that the signal receiving direction is as follows: the received air interface signal enters an IF frequency mixing part after passing through an LNA module, is converted into an intermediate frequency signal and then is sent to an ADC module for analog-to-digital conversion, and then is sent to an FPGA module for DDC (digital down conversion) and is packaged into a CPRI frame and then is sent to an SFP optical module to be converted into an optical signal to enter an optical fiber. The signal transmitting direction is as follows: the SFP optical module recovers an electric signal from the optical fiber and sends the electric signal into the FPGA, the FPGA sends a baseband signal in a received CPRI frame to a DAC for digital-to-analog conversion after DUC (digital up-conversion), then the baseband signal is mixed to a radio frequency signal through radio frequency, and the radio frequency signal is finally converted to a radio frequency signal and then amplified through a PA module and transmitted through an antenna. The traditional scheme needs a high-speed optical fiber module to transmit baseband signals, and the cost is high.

In an alternative embodiment, the FPGA chip includes a weighted compression module that compresses the baseband signals. The extracted baseband data is 12-bit quantized IQ data, and the 12-bit data can be compressed to 9-bit data through weighting compression to perform CPRI frame sealing operation, so that the transmitted data volume is reduced. In the present embodiment, the SFP module is a 3.072Gbps optical module. The 6.144Gbps SFP module is needed for GSM 20M bandwidth and LTE40M dual-antenna data during 12-bit data transmission, but only the 3.03.072Gbps optical module is needed after the FPGA chip is weighted and compressed, so that the cost of an optical fiber publishing system is reduced, and the competitiveness of a product is increased.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A low cost fiber distribution system comprising a main unit, an expansion unit, and a remote unit, wherein the main unit comprises:

the LNA module is used for receiving an air interface signal;

the PA module is used for transmitting a radio frequency signal;

the FPGA chip comprises a CPRI frame sealing module and a CPRI frame de-sealing module and is used for sealing the baseband signal into a CPRI frame and de-sealing the electric signal into the CPRI frame;

the SFP module is connected with the FPGA chip and the optical fiber; the device is used for converting the electric signal into CPRI frames;

the Transceiver module comprises a receiving module and a transmitting module and is used for converting the air interface signal and the baseband signal to each other;

the receiving module is connected to the LNA module and the CPRI framing module, and is configured to convert an air interface signal received by the LNA module into a baseband signal; the CPRI frame encapsulating module is connected with the receiving module and the SFP module and is used for encapsulating the baseband signal into a CPRI frame; the CPRI frame decoding module is connected with the transmitting module and the SFP module and used for converting the CPRI frame into a radio frequency signal.

2. The low cost fiber distribution system of claim 1, wherein a web connection structure is provided between the expansion unit and the remote unit.

3. The low cost fiber distribution system of claim 1, wherein the FPGA chip includes a weighted compression module that compresses the baseband signal.

4. The low cost fiber distribution system of claim 1, wherein the SFP module is a 3.072Gbps optical module.