KR100758883B1 - Digital multiple path signal matching device of repeater - Google Patents

Abstract

The present invention relates to a digital multipath signal matcher of a repeater, and more particularly, to fading generated when the first multipath of a wireless communication signal output from a base station passes through a matched control coefficient adjusted according to the first multipath information estimated by the repeater. The present invention relates to a digital multipath signal matcher that can improve the transmission efficiency of high-speed data by matching and removing the data. To this end, the present invention is a mobile communication system comprising a mobile telecommunication switching station that provides circuit switching services to subscribers by serving as an interface between a public telephone network (PSTN) and a mobile communication network, each located in a plurality of divided cells A base station transmitting and receiving a signal for wireless communication with a mobile terminal; A relay for receiving a wireless communication signal output from the base station through a first multipath, analyzing the wireless communication signal, and matching and outputting the wireless communication signal according to the first multipath information estimated based on the analysis result. And a repeater of matching means.

Repeater, Repeater & Matching Means, Multipath Signal Matcher, Digital Multipath

Description

DIGITAL MULTIPLE PATH SIGNAL MATCHING DEVICE OF REPEATER}

1 is a block diagram showing the configuration of a general mobile communication system.

Figure 2 is a waveform diagram showing the dual multi-path effect of the wireless communication signal output from the conventional base station.

3 is a schematic diagram showing a configuration of an embodiment of a mobile communication system according to an embodiment of the present invention;

Figure 4 is a detailed block diagram showing the configuration of the relay and matching means of the repeater shown in Figure 3;

Fig. 5 is a detailed block diagram showing the configuration of the matching means shown in Fig. 4;

6 is a flowchart illustrating a digital multipath signal matcher of the repeater of the present invention.

FIG. 7 is a detailed operation flowchart showing the first multipath information estimation process shown in FIG. 6;

8 is a waveform diagram showing the dual multipath effect of a wireless communication signal output from a base station of a mobile communication system.

***** Description of the symbols for the main parts of the drawings *****

100: base station 200: relay and matching means

201,208: duplex filter 202: low noise amplification means

203: conversion means 204: saw filter

205: matching means 206, 207: amplification means

401: analogue / digital conversion means 402: digital matching means

403: digital / analog conversion means 404: multipath estimation means

405: matching control coefficient adjusting means

The present invention relates to a digital multipath signal matcher of a mobile communication system and a repeater. In particular, fading generated when a first multipath of a wireless communication signal output from a base station is passed is adjusted according to the first multipath information estimated by the repeater. The present invention relates to a digital multipath signal matching device for improving the transmission efficiency of high-speed data by matching and eliminating by matching control coefficients of relay and matching means.

Due to the rapid development of mobile communication services, high quality services are also desired in mountain wallpaper, remote islands, urban radio blind spots, subways, tunnels, and apartment complexes, where mobile communication services have not been completely provided to non-demand areas. However, if a service provider makes a huge investment for expansion of a base station in a radio blind spot, it may cause a loss of the service provider's balance of management and a huge investment inefficiency in the country. As a countermeasure, 'relay system' is being used to improve high communication quality and service range at low cost.

The scientific and technological fields that have been the foundation of the recent one-on-one mobile phone era include the introduction of cellular concepts, the development of wireless transmission technology (commercialization of CDMA), and the development of optical transmission technology.

The concept of cellular provides the opportunity for the development of wireless mobile communication by improving the frequency reuse efficiency by dividing the call capacity shortage and the call quality problem due to the limitation of the frequency spectrum, which is the biggest limitation of wireless communication, in all regions. The development of transmission technology provided the opportunity for the development of digitalization of wireless communication system.

The digitalization of the mobile communication system has been devised as a solution to quality problems such as system capacity limitation and weak security of the existing analog system, and as a result, many methods such as TDMA, GSM, and CDMA have emerged. In addition, the development of optical transmission technology has contributed to the development of network implementation technology by the high speed of the switching network and the development of photoelectric conversion technology.

In Korea, the demand for CDMA wireless mobile phone service became commercially available in the 1990s, and the demand was limited to a few classes. In addition, the wireless network environment was limited in demand area. However, as the wireless mobile phone service gradually became more popular, the wireless network environment of operators is urgently required to expand the area and system capacity.In addition, Korea's geographic characteristics and specificity of population density make it necessary to design the optimal wireless environment. Therefore, measures for many shaded areas are needed.

Here, the shaded area refers to an area where the radio path between the base station and the terminal is cut off. In other words, it refers to an area where radio waves cannot reach by buildings or terrain. In order to eliminate such shaded areas, additional base stations or additional repeaters are used to design wireless networks.

In terms of performance, the base station is much better than the repeater, but in terms of cost, the base station is more expensive than the repeater. In order to eliminate the small shadow area, the fact that the installation of the base station can be over-invested in terms of cost and performance, can not be overlooked, so the wireless network design and service provider usually solves the shadow area solution with a repeater.

In this case, the mobile communication propagation from the base station to the mobile communication terminal through the repeater is formed in the multipath, and as a cause of the multipath, the mobile communication terminal has a problem in that the transmission performance is deteriorated under the influence of multipath fading. .

In order to solve this problem, the mobile communication terminal is provided with a rake receiving means to compensate for the degradation in transmission performance due to the multipath fading phenomenon of radio waves from the base station to the mobile communication terminal.

1 is a block diagram showing the configuration of a conventional mobile communication system, which includes a mobile station, a repeater, a base station, and a mobile communication switching center.

The mobile station (MS) refers to a terminal of a wireless subscriber who moves within a service area and communicates with a base station through a wireless channel. There are three types of mobile stations. In case of stop or low speed, PS (Personal Station), vehicle or aircraft (high speed) such as MS (Mobile Station), and in case of service using satellite, MES (Mobile Earth Station) is used.

The base station (BS) is located in a plurality of divided cells for efficient use of the mobile communication system, and performs wireless communication with the mobile station.

That is, the base station receives a signal emitted from a mobile station in a cell under its control over a wireless channel, transmits the signal to a mobile communication switching station, and conversely transmits a signal from the mobile communication switching station to the mobile station through the wireless channel. do.

The mobile switching center (MSC) serves as an interface between a public telecommunication network (PSTN) and a mobile communication network to provide circuit switching services to subscribers, as well as to manage radio resources. It provides the function to keep track of the location so that it can always be serviced, and to keep the call even if the mobile station moves during the call.

The repeater receives a downlink signal output from the base station to the mobile station through an input antenna, amplifies the received downlink signal by a predetermined magnitude, and outputs the downlink signal to the mobile station through an output antenna.

That is, the wireless communication signal (downlink signal) output from the base station is transmitted to the mobile station through the primary multipath and the secondary multipath as shown in FIG. 2, and the primary multipath is generated between the base station and the repeater. Secondary multipath occurs between the repeater and the mobile station.

In this case, fading occurs by the first multipath and the second multipath, which causes a problem of degrading transmission quality of a communication device using electromagnetic waves.

That is, fading by the multipath is caused by a phase difference (time delay difference) of a signal received at a receiver of a mobile station in a different path, and the phase difference of the signal reduces the magnitude of a received signal input to the mobile station. By worsening the Carrier to Interference (C / I), there is a problem that the transmission error occurs intensively.

The present invention has been invented to solve the above problems, the relay and matching means for adjusting the fading generated when the first pass multipath of the wireless communication signal output from the base station according to the first multipath information estimated by the repeater It is an object of the present invention to provide a digital multi-path signal matcher of a repeater which improves the transmission efficiency of high-speed data by matching and eliminating by matching control coefficient of.

The present invention for achieving the above object,

In a mobile communication system including a mobile communication switching center serving as an interface between a public telecommunication network (PSTN) and a mobile communication network and providing circuit switching services to subscribers, the mobile communication system is located in a plurality of divided cells and wirelessly communicates with the mobile terminal. A base station for transmitting and receiving a signal for communication;

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Receive the wireless communication signal output from the base station through the first multi-path and analyze the wireless communication signal,

And a repeater for repeating and matching means for matching and outputting the wireless communication signal according to the estimated first multipath information based on the analysis result.

The present invention for achieving the above object, in the multi-path signal matching repeater of the mobile communication system,

Receiving a wireless communication signal output from the base station;

Analyzing the received wireless communication signal and estimating primary multipath information based on the analysis result;

Calculating a match control coefficient based on the estimated first multipath information;

According to the matching control coefficient, characterized in that for performing the process of matching the received wireless communication signal.

Hereinafter, the operation and effects of the digital multipath signal matcher of the mobile communication system and the repeater according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram showing the configuration of an embodiment of a mobile communication system of the present invention;
The present invention comprises a base station 100, a repeater and matching means of the repeater 200, and the mobile terminal 300.

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The base station 100 is located in each of a plurality of divided cells to transmit and receive signals for wireless communication with the mobile terminal 300.

The repeater and matching means 200 of the repeater is a technical configuration of the present invention, and receives the wireless communication signal output from the base station 100 through the first multi-path to analyze the wireless communication signal, the analysis result Matching and outputting the wireless communication signal in accordance with the first order multipath information estimated based on the.

The mobile terminal 300 performs a wireless communication by receiving a wireless communication signal output from the relay and matching means 200 through a secondary multipath.

4 is a block diagram showing the detailed configuration of the repeater and the matching means of the repeater, the first duplex filter 201, the low noise amplification means 202, the conversion means 203, the saw filter connected to the antenna of the base station in the repeater 204, matching means 205, first and second amplifying means 206, 207, a second duplex filter 208 connected to the antenna of the mobile terminal, the second duplex filter 208 and the first duplex filter ( And uplink block 209 between 201).

The signal from the base station to the mobile terminal is introduced into the antenna of the repeater base station through the first multiple fading environment. The first duplex filter 201 connected to the antenna filters only a service band of a wireless communication signal received through a base station direction antenna. The wireless communication signal filtered by the first duplex filter 201 is a signal having a weak signal strength.

The low noise amplifying means 202 low noise amplifies the weak wireless communication signal output from the first duplex filter 201.

As a mixer, the converting means 203 down-converts the signal output from the low noise amplifying means 202 into an intermediate frequency signal, that is, converts the radio communication signal, which is a high frequency signal RF, into a frequency down-converted frequency. To.

The saw filter 204 performs SAW filtering on the intermediate frequency signal output from the converting means 203 to finely filter the service frequency band.

As a digital multipath signal matching block, the matching means 205 converts the signal output from the saw filter 204 into a digital signal, analyzes the digital signal, and based on the first order multipath information estimated according to the analysis result. To match the digital signal.

The first amplifying means 206 as a drive amplifier and the second amplifying means 207 as a power amplifier amplify the signal output from the matching means 205 to a rated level, and the second duplex filter 208 The amplified signals output from the first and second amplifying means (206, 207) are filtered and transmitted to the mobile terminal 300 through the antenna.

Fig. 5 is a block diagram showing the configuration of an embodiment of the matching means 205 as a digital multipath signal matching block, and is a matching control as an analog / digital conversion means 401, a multipath estimating means 404, and an equalization coefficient controller. It comprises a coefficient adjusting means 405, a digital matching means 402, and a digital / analog converting means 403 as a digital equalizer.

The analog / digital converting means 401 converts an intermediate frequency signal, which is a service frequency band filtered through the saw filter 204 shown in FIG. 4, into a digital signal, thereby digital matching means 402 and multipath estimating means 404. Each).

The multipath estimating means 404 analyzes the digital signal output from the analog / digital converting means 401 and estimates primary multipath information based on the analysis result. That is, the delay time, magnitude, and phase of the superimposed signals of the digital signal are extracted using the time axis correlation of the digital signal, and the delay time, magnitude, and phase are estimated as the first order multipath information.

The multipath estimating means 404 receives the digital matching signal from the digital matching means 402 to be described later, compares the fed back digital matching signal with the digital signal, and matches the matching control coefficient based on the comparison result. The error compensation signal for correcting the error of the output to the matching control coefficient adjusting means 405.

The matching control coefficient adjusting means 405 adjusts the matching control coefficient according to the first order multipath information estimated by the multipath estimating means 404, that is, the delay of the overlapped signals calculated in the time axis correlation of the digital signal. The match control coefficient is calculated using time, magnitude, and phase.

The matching control coefficient is a kind of filter (filter) coefficient, and is adaptively changed to the radio environment change between the base station and the relay period by the error compensation signal.

The digital matching means 402 matches the digital signal output from the analog / digital conversion means 401 by the matching control coefficient of the matching control coefficient adjusting means 405. At this time, the digital matching means 402 is composed of a filter (filter), the larger the matching control coefficient is the amplitude response size of the filter is increased, the complex phase is made of a structure that is adjusted according to the phase value of the matching control coefficient.

The digital / analog converting means 403 converts the digital matching signal output from the digital matching means 402 into an analog signal and supplies it to the first amplifying means 406 shown in FIG.

Such an operation of the present invention will be described with reference to Figs.

First, the relay and matching means 200 of the repeater receives the wireless communication signal output from the base station 100 through the primary multipath (SP1).

Subsequently, the repeater's relay and matching means 200 analyzes the wireless communication signal and estimates primary multipath information based on the analysis result (SP20).

The first method of estimating multipath information will be described with reference to FIG. 7. First, the wireless communication signal received from the base station is down-converted through the converting means 203, and the analog / digital converting means of the matching means 205 ( The 401 receives the downconverted intermediate frequency signal through the saw filter 204 and converts it into a digital signal (SP21).

Then, the multipath estimating means 404 connected to the analog / digital converting means 401 analyzes the digital signal, i.e., calculates the time axis correlation of the digital signal (SP22), and calculates the calculated time axis correlation. Using the relationship, the delay time, magnitude, and phase of the superimposed signals of the digital signal are extracted (SP23), and the delay time, magnitude, and phase are estimated as first order multipath information (SP24).

In addition, the multi-path estimating unit 404 receives the digital matching signal of the digital matching unit 402, compares the fed back digital matching signal with the digital signal, and based on the comparison result, the error of the matching control coefficient. The error compensation signal for correcting the output to the matching control coefficient adjustment means 405.

Then, the matching control coefficient adjusting means 405 calculates the matching control coefficient by using the estimated first multipath information (SP30), that is, the overlapped signals calculated according to the time axis correlation of the digital signal. The matching control coefficient is calculated using the delay time, magnitude, and phase.

At this time, the matching control coefficient is adaptively changed by the error compensation signal to the environmental change of the base station and the relay period.

Then, the digital matching means 402 matches the digital signal output from the analog / digital conversion means 401 by the matching control coefficient output from the matching control coefficient adjusting means 405 (ie, SP40). The digital matching means 402 comprises a filter (filter) to filter the digital signal using the matching control coefficient as the filter coefficient.

Then, the digital / analog converting means 403 of the matching means 205 converts the digital signal into an analog signal and amplifies the analog signal to the rated level by the first and second amplifying means 206 and 207. The amplified signal is transmitted to the mobile terminal 300 through the second duplexer filter 208 and the antenna.

That is, in the related art, the transmission quality of a communication device using electromagnetic waves is deteriorated due to fading generated when the wireless communication signal output from the base station passes through the first multipath and the second multipath, as shown in FIG. Unlike in FIG. 8, by fading generated when the first multipath of the wireless communication signal output from the base station passes, the matching control coefficient adjusted according to the first multipath information estimated by the repeater is used to remove the fading. It is to improve the transmission quality of communication equipment.

The specific embodiments or examples made in the detailed description of the present invention are intended to clarify the technical contents of the present invention to the extent that they should not be construed as limited to these specific examples and should not be construed as consultations. Various changes can be made within the scope of.

As described above in detail, the present invention matches and removes fading generated when a first multipath of a wireless communication signal output from a base station passes by a matching control coefficient adjusted according to first multipath information estimated by a repeater. In addition, it has an excellent effect of improving the transmission quality of a communication device using electromagnetic waves.

Claims (15)

delete A mobile telecommunication switching center serving as an interface between a public telecommunication network (PSTN) and a mobile telecommunication network to provide circuit switching services to subscribers; A base station positioned in each of a plurality of divided cells and transmitting and receiving a signal for wireless communication with a mobile terminal; A first duplex filter for passing a wireless communication signal received through an antenna only in a service band, low noise amplifying means for low noise amplifying a signal output from the first duplex filter, and a signal output from the low noise amplifying means is downgraded to an intermediate frequency signal A conversion means for converting, a saw filter for saw filtering the intermediate frequency signal output from the converting means, an amplifying means for amplifying the signal to a rated level, and a second filter for filtering and outputting the amplified signal output from the amplifying means. In the mobile communication system constituting a repeater of the repeating and matching means including a duplex filter, An analog / digital conversion means for converting the signal output from the saw filter into a digital signal between the saw filter and the amplifying means in the repeater; Analyze the signal output from the analog / digital conversion means based on the time-base correlation of the digital signal, but extract the delay time, magnitude, and phase of the overlapped and inflowed signal through the multipath between the base station and the repeater, and use the first multipath information. Multipath estimation means for estimating Matching control coefficient adjusting means for calculating a matching control coefficient by digitizing a complex phase which is information (delay time, magnitude, phase) obtained from the multipath estimating means; Digital matching means for multiplying the matching control coefficient obtained by the matching control coefficient adjusting means by the digital signal output from the analog / digital conversion means so that the signal introduced through the multipath between the base station and the repeater is matched; And digital / analog converting means for converting the digital matching signal output from the digital matching means into an analog signal. delete delete The method of claim 2, wherein the multi-path estimating means, Digital multiplexing of the repeater, receiving a digital match signal and comparing the fed back digital match signal with the digital signal, and outputting an error compensation signal for correcting the error of the match control coefficient based on the comparison result Path signal matcher. delete delete delete delete delete delete delete delete delete delete

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