KR19990070480A - Digital data processing device of communication channel for digital mobile communication base station - Google Patents

Abstract

The present invention is to provide an apparatus capable of processing a call channel by digitally synthesizing alpha sector, beta sector and gamma sector output from a channel card, and then converting and amplifying them to analog. Alpha-sector, beta-sector, and gamma-sector, which are geographically separated from the channel card, respectively, convert the serial digital data of the I-channel and the Q-channel in parallel and synthesize them, respectively, and synthesize the synthesized I-channel and Q-channel digital. By converting the synthesized data into 16-bit analog signals and then amplifying them, the parts processed by reducing analog processing are reduced by 1/3 or more compared to conventional devices, thereby reducing the size of each board and increasing the density. Reduces the overall volume of the circuit, reduces the number of components in the digital data processing unit of the call channel, resists noise and debugs the board It will shorten the time.

Description

Digital data processing device of communication channel for digital mobile communication base station

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base station of a digital mobile communication system. In particular, the present invention relates to 120 call channel digital data generated by a cell site modem (hereinafter referred to as CSM) mounted on a channel card in a base station of a digital mobile communication system. It relates to a device for processing.

In general, the digital mobile communication system is applied to digital mobile communication and advanced wireless communication, and is a device that solves the capacity problem for mobile communication demand and provides an economical, efficient and portable mobile communication method.

In the digital mobile communication system, a conventional apparatus for processing digital data of 120 call channels for a base station includes 15 channels for converting, amplifying and outputting digital data output from the CSM into an analog signal, as shown in FIG. A card 10; Two analog common cards 30 for analog addition of analog signals output from the 15 channel cards 10; It consists of three sector interface cards 40 which sum the signals output from the two analog common cards 30.

The 15 channel cards 10 convert the serial data of the alpha sector, beta sector, and gamma sector of the I (Inphase) channel and the Q (Quadrature) channel, each of which is geographically separated, into parallel data. A serial / parallel conversion and state processing unit 11 for correcting phase distortion; First to sixth digital converting 12-bit digital I-channel and Q-channel data of alpha, beta, and gamma sectors output from the serial / parallel conversion and state processor 11 into 12-bit analog data, respectively. An analog to digital (hereinafter, abbreviated as D / A) conversion unit 12 to 17; First through sixth D / A converters 12 through 17 amplifying analog data respectively output by outputting I-channel and Q-channel data of an alpha sector, a beta sector, and a gamma sector, respectively. It consists of the 6th amplification parts 18-23.

The two analog common cards 30 are synthesized by synthesizing eight analog alpha sectors, beta sectors, and gamma sectors of I-channel and Q-channel data, respectively, output from the channel card 10. And first to sixth analog combining units 31 to 36 for outputting I-channel and Q-channel data of the beta sector and the gamma sector, respectively.

In the above three sector interface card 40, the seventh and eighth analog synthesizing unit for synthesizing and outputting two analog data of the I-channel or Q-channel signal output from the analog common card 30, respectively; It consisted of (41) (42).

Conventional call channel digital data processing apparatus configured as described above is divided into geographic sectors and sets the alpha sector from 0 ° to 120 °, the beta sector from 120 ° to 240 °, and the gamma sector from 240 ° to 360 °. When set to, the digital data of the alpha sector, beta sector, and gamma sector of the input I-channel and Q-channel, respectively, was converted to analog and then synthesized. In order to process digital data of 120 call channels, 15 channel cards 10 (8 call channels per channel card), 2 analog common cards 30 and 3 sector interface cards 40 are provided. Is needed.

Thus, eight CSMs are mounted in one channel card, and the CSM output data are processed in parallel in the serial / parallel conversion and state processing unit 11, and then the alpha sector I in the first to sixth D / A conversion units 12 to 17. Converts 12-bit digital data of channel, alpha sector Q-channel, beta sector I-channel, beta sector Q-channel, gamma sector I-channel and gamma sector Q-channel into 12-bit analog signals, respectively. The converted analog signal is then amplified and output through the first to sixth amplifying units 18 to 23.

In this way, the signal output from the channel card 10 is analog-added in the analog common card 30 through the first to sixth analog combining units 31 to 36. Accordingly, one analog common card 20 adds eight CSM data and data from eight channel cards 10 to process 64 call channels. Another analog common card 30 adds data from eight CSM data and seven channel cards 10 to process 56 communication channels.

Thus, the analog signals output from the two analog common cards 30 are summed through the seventh and eighth analog combining units 41 and 42 of the sector interface card 40, so that the total of 120 (= 64 + 56) It could handle the call channel.

However, the elements used in the conventional apparatus require 15 elements for serial / parallel conversion and state processing, 90 (= 15 × 6) 12-bit digital / analog conversion elements, and 90 (= 15 x 6) is required, and 15 analog composite elements are also required. There are various types of boards, and the same components are repeatedly used, thereby increasing the volume of the card and increasing the price.

In addition, after converting the digital signal to analog, there are many parts that need to process the signal, which increases the complexity of the circuit and has a lot of influences on external sleep.

Accordingly, the present invention has been proposed to solve the above-mentioned conventional problems, and an object of the present invention is to digitally synthesize alpha sectors, beta sectors, and gamma sectors output from the CSM of the channel card in separate cards. The present invention provides a digital data processing apparatus for a call channel for a digital mobile communication base station capable of processing 120 call channels by converting and amplifying bit digital / analog.

In order to achieve the above object, a digital data processing apparatus of a communication channel for a digital mobile communication base station according to the present invention,

A digital synthesizing unit for converting the serial digital data of the I-channel and the Q-channel of each of the alpha sector, the beta sector, and the gamma sector of the geographically divided space of the channel card in parallel to each other; A D / A converter for converting 16-bit digital data of the I-channel and Q-channel synthesized by the digital synthesizer into analog signals, respectively; Characterized in that the technical configuration consisting of an amplifier for amplifying and outputting the signal converted to analog in the D / A converter.

1 is a block diagram showing a conventional communication channel digital data processing apparatus;

2 is a block diagram of a digital data processing apparatus for a call channel for a digital mobile communication base station according to the present invention;

3 is a detailed block diagram showing processing of alpha sector data of a CSM in FIG. 2;

4 is a detailed block diagram showing processing of beta sector data of a CSM in FIG. 2;

FIG. 5 is a detailed block diagram illustrating processing of gamma sector data of the CSM in FIG. 2; FIG.

Explanation of symbols for the main parts of the drawings

110: alpha sector digital synthesis unit 120: alpha sector D / A conversion unit

130: alpha sector amplification unit 210: beta sector digital synthesis unit

220: beta sector D / A conversion unit 230: beta sector amplification unit

310: gamma sector digital synthesis unit 320: gamma sector D / A converter

330: gamma sector amplification unit

Hereinafter, an embodiment according to the technical concept of a digital data processing apparatus for a communication channel for a digital mobile communication base station configured as described above will be described in detail.

2 is a block diagram of a digital data processing apparatus for a call channel for a digital mobile communication base station according to the present invention.

As shown in the figure, the digital synthesizer 110 converts the serial digital data of the I-channel and the Q-channel of the alpha sector, the beta sector, and the gamma sector, respectively, into a geographically divided space of the channel card in parallel. (210) 310; D / A converters 120 and 220 for converting the 16-bit digital data synthesized from the I-channel and the Q-channel synthesized by the digital synthesizers 110, 210 and 310 into analog signals, respectively. 320; The D / A converters 120, 220, and 320 are amplified parts 130, 230, and 330 for amplifying and outputting the analog signal.

In the digital synthesis unit 110, 210 and 310, I-channel digital synthesis, which receives the I-channel serial digital data of an alpha sector, a beta sector, or a gamma sector from the channel card, converts them in parallel and synthesizes them in parallel. Sections 111, 211, and 311; The channel card comprises Q-channel digital synthesis units 112, 212, and 312 that receive alpha-channel, beta-sector, or gamma-sector Q-channel serial digital data and convert them in parallel to each other.

The D / A converter 120 (220) 320 is an I-channel of an alpha sector, a beta sector, or a gamma sector synthesized by the I-channel digital synthesis units 111, 211, and 311, respectively. I-channel D / A converters 121, 221, and 321 for converting digital data into 16-bit analog signals, respectively; Q-channel D / A conversion for converting Q-channel digital data of alpha sector, beta sector, or gamma sector synthesized by the Q-channel digital synthesis unit 112, 212, and 312 into a 16-bit analog signal, respectively. It is composed of portions 122, 222 and 322.

The amplification unit 130, 230, 330 may be an I-channel of an alpha sector, a beta sector, or a gamma sector converted to analog by the I-channel D / A converters 121, 221, 321. I channel amplifiers 131, 231 and 331 for amplifying and outputting data; Q-channel amplification unit 132 (232) for amplifying and outputting Q-channel data of an alpha sector, a beta sector, or a gamma sector converted to analog by the Q channel D / A converters 122, 222, and 322. (332).

The operation of the digital data processing apparatus of the call channel for a digital mobile communication base station configured as described above will be described in detail with reference to the accompanying drawings.

First, each channel card generates digital data of an alpha sector I-channel, an alpha sector Q-channel, a beta sector I-channel, a beta sector Q-channel, a gamma sector I-channel, and a gamma sector Q-channel. This signal is input to the baseband interface card assembly (BICA) for each sector. Therefore, three BICAs are required to process alpha, beta, and gamma sector data respectively.

Thus, referring to the detailed block diagram showing the alpha sector data processing of the CSM shown in FIG. 3, the processing operation of the I-channel and Q-channel of the alpha sector is as follows.

In the CSM output data of each channel card, I-channel data is A-I0.1_1, A-I0.1_2, A-I0.1_3, A-I0.1_4, A-I0.1_5, A-I0.1_6, A-I0.1_7, A-I0.1_8, A-I0.1_9 and A-I0.1_10, and this data is input to the digital synthesis unit 110 of the alpha sector in one BICA. Then, the I-channel digital synthesis unit 111 of the digital synthesis unit 110 converts the 10 serial data of the I-channel in parallel and then synthesizes the data converted in parallel. The synthesized digital data is input to the 16-bit I-channel D / A converter 121 to be analog-converted, and its output is amplified to a desired size by the I-channel amplifier 131 and output.

Also, the Q-channel data in the CSM output data of each channel card is A-Q0.1_1, A-Q0.1_2, A-Q0.1_3, A-Q0.1_4, A-Q0.1_5, A-Q0.1_6 , A-Q0.1_7, A-Q0.1_8, A-Q0.1_9 and A-Q0.1_10, and this data is input to the digital synthesis unit 110 of the alpha sector in the BICA. Then, the Q-channel digital synthesis unit 112 of the digital synthesis unit 110 converts the 10 serial data of the Q-channel in parallel and then synthesizes the data converted in parallel. The synthesized digital data is input to the 16-bit Q-channel D / A converter 122 to be analog-converted, and its output is amplified and output to a desired size by the Q-channel amplifier 132.

Similarly, the digital data of the I-channel and Q-channel of the beta sector and the I-channel and Q-channel of the gamma sector is also processed in the I-channel and Q-channel data of the alpha sector as shown in FIGS. 4 and 5. It is processed in the same way as the operation to be amplified to the desired size and output.

Thus, the card used in the apparatus according to the present invention requires 10 channel cards (12 call channels per channel card) and 3 BICAs. The devices used here include six (= 3 x × I-channel + Q-channel) digital synthesizers, 6 (= 3 x 2) 16-bit D / A converters, and 6 (= 3 x 2). With this amplifier, it is possible to perform digital data processing of 120 call channels (= 10 sheets x 12 call channels).

As described above, the digital data processing apparatus of the call channel for the digital mobile communication base station according to the present invention digitally synthesizes the alpha sector, the beta sector, and the gamma sector output from the channel card in a separate card and then converts the analog. By reducing the parts that are processed as analog, the required parts can be reduced by 1/3 or more compared with conventional devices, so that the size of each board can be reduced and the density can be increased, thereby reducing the total volume of the base station.

In addition, by reducing the number of components in the digital data processing unit of the call channel, it is also resistant to noise, can reduce board debugging time, and can reduce manufacturing costs.

Claims (4)

Digital synthesis unit 110, 210, and 310 for converting the serial digital data of the I-channel and the Q-channel of the alpha sector, the beta sector, and the gamma sector, respectively, into a geographically divided space of the channel card in parallel. Wow; D / A converters 120 and 220 for converting the 16-bit digital data synthesized from the I-channel and the Q-channel synthesized by the digital synthesizers 110, 210 and 310 into analog signals, respectively. 320; Call for digital mobile communication base station, characterized in that consisting of amplification unit (130, 230, 330) for amplifying and outputting the signal converted into analog in the D / A converter (120, 220, 320) Channel digital data processing device. The method of claim 1, wherein the digital synthesis unit 110, 210, 310, An I-channel digital synthesis unit (111) (211) (311) for receiving the I-channel serial digital data of an alpha sector, a beta sector, or a gamma sector from the channel card and converting them in parallel; Q-channel digital synthesis unit (112, 212, 312) is composed of Q-channel serial digital data of alpha sector, beta sector, or gamma sector from the channel card, and converts them in parallel to each other. Digital data processing apparatus for a call channel for a digital mobile communication base station. The method of claim 1, wherein the D / A converter 120, 220, 320, I-channel D / A for converting I-channel digital data of alpha sector, beta sector, or gamma sector respectively synthesized by the I-channel digital synthesis unit 111, 211, and 311 into a 16-bit analog signal, respectively. A conversion unit (121, 221, 321); Q-channel D / A conversion for converting Q-channel digital data of alpha sector, beta sector, or gamma sector synthesized by the Q-channel digital synthesis unit 112, 212, and 312 into a 16-bit analog signal, respectively. Digital data processing apparatus for a call channel for a digital mobile communication base station, characterized in that the unit (122) (222, 322). The method of claim 1, wherein the amplifier 130, 230, 330, I-channel amplification unit 131 (231) for amplifying and outputting I-channel data of an alpha sector, a beta sector, or a gamma sector converted to analog by the I-channel D / A converters 121, 221, and 321. 331; Q-channel amplification unit 132 (232) for amplifying and outputting Q-channel data of an alpha sector, a beta sector, or a gamma sector converted to analog by the Q channel D / A converters 122, 222, and 322. Digital data processing apparatus for a call channel for a digital mobile communication base station, characterized in that consisting of (332).