KR101297818B1 - A Relay station for reducing transmission rate and method thereof - Google Patents

Abstract

The present invention relates to a repeater and a method for reducing transmission speed, and more particularly, to integrate a plurality of different radio communication signals into one intermediate frequency signal to support a plurality of radio communication services, thereby requiring signal processing. The present invention relates to a repeater and a method capable of reducing transmission speed. According to the present invention, the center frequency of each signal is adjusted differently in consideration of the guard interval between a plurality of wireless services or MIMO signals and processed as a continuous signal integrated in one intermediate frequency, thereby reducing the number of analog-to-digital converters required and The transmission rate can be reduced and optimized for bandwidth, so that a low-cost transmission medium can be used.

Description

A relay station for reducing transmission rate and method

The present invention relates to a repeater and a method for reducing transmission speed, and more particularly, to integrate a plurality of different radio communication signals into one intermediate frequency signal to support a plurality of radio communication services, thereby requiring signal processing. The present invention relates to a repeater and a method capable of reducing transmission speed.

In mobile communication, a base station is located in a service area to support a wireless communication service and performs a relay role between an exchange station and a terminal. In this case, when the terminal is located in the shadow area that is not available for service, the communication state is degraded.To improve this, the terminal receives a signal from the base station and retransmits the signal to the terminal located in the shadow area or retransmits the signal received from the terminal to the base station. Repeater is installed.

Recently, a mobile communication system simultaneously performs a plurality of wireless services, and the repeater 1 transmits a signal received from a base station or a network network as shown in FIG. 1 to support the wireless signal corresponding to a band of each mobile communication service. In addition, the signal received from the terminal in the band of each mobile communication service can be retransmitted to the base station or the network.

In this case, the repeater 1 simultaneously receives radio signals for multiple service bands such as CDMA, WCDMA, LTE, LTE-Adavance, over 4G, Wifi service, or MIMO service, and relays mutual communication with the base station or network network. can do.

Detailed configuration of the existing repeater 1 for simultaneously supporting a plurality of mobile communication services will be described in detail with reference to FIG. 2.

First, when each configuration is described as a reference for retransmitting a signal received from a base station, an AP, or a network to the terminal, the transmission medium manager 11 collecting the signals received through the transmission medium from the base station or the network; A logic processor 12 for dividing the signal collected from the transmission medium manager 11 into corresponding paths, and a digital signal connected to each path by sampling the analog signal received from the logic processor 12 at a predetermined frequency; A plurality of D / A converters 13 for converting to a plurality of channels, a plurality of gain units 70 connected to the respective D / A converters 13 for adjusting a signal level, and a signal for which the signal level is adjusted A plurality of SAW filters 20 for filtering the plurality of SAW filters, a plurality of up-converter units 30 connected to each SAW filter 20 to upconvert the filtered signal to the original frequency of the signal, and the up-converter unit 30. Amplifier 50 for amplifying the signal received from the) and a duplexer or multiplexer 60 for multiplexing the signals received from the respective amplifiers 50 and transmitted to the terminal through the antenna.

On the contrary, the down converter unit 40 down-converts the signal received through the duplexer 60 to a predetermined intermediate frequency in order to retransmit the signal received from the terminal to the base station, and each of the down converter units 40. A plurality of SAW filters 20 for filtering to a predetermined band based on a predetermined intermediate frequency, and a plurality of gains for connecting the SAW filters 20 to adjust a received signal to a predetermined signal level. And a plurality of A / D converters 14 for restoring the filtered analog signal to an intermediate frequency and converting the filtered analog signal into a digital signal. The logic processor 12 includes a plurality of A / D converters ( The signal received from 14 is merged and provided to the transmission medium manager 11, and the transmission medium manager 11 transmits the merged signal to a base station, an AP, or a network through a transmission medium.

In the configuration of such a repeater, the signal of the physical layer of the mobile communication is generally the maximum of the signal for restoration in converting an analog signal into a digital signal or converting a digital signal into an analog signal according to Nyquist theory. More than twice the sampling frequency is required for bandwidth.

However, since the SAW filter currently used in the repeater 1 is difficult to implement in the band below 50 MHz, the A / D and D / A sampling frequencies are determined based on the limits of the SAW filter. In most cases, however, the bandwidth of the communication signal is often less than 20 MHz, which increases the amount of data to be relayed by the sampling frequency that is unnecessarily higher than the actual sampling frequency. It is not efficient because it leads to an increase.

On the other hand, when the signal bandwidth received from the base station or the terminal is significantly smaller than the center frequency of the SAW filter, the limited aliasing does not occur for normal signal processing such as decoding and signal recovery at the signal and sampling frequency You can select the appropriate down sampling frequency in your environment. However, since it is variable according to bandwidth and according to characteristics of multiple communication methods, it is limited to the method of estimating the sampling frequency low.

For example, if the signal bandwidth is 10MHz and the filtering intermediate frequency is determined to be 62.5MHz, which is a practical lower limit frequency of the SAW filter, a sampling frequency of 50MHz or less should be set even if the sampling rate is reduced to reduce the transmission rate. If the bandwidth is variable or variable at the node, the downsampleable frequency will be more limited or higher, thus increasing unnecessary data.

For example, if the configuration shown in Figure 3 is for a dual system with two 10 MHz signal bandwidths and 12 bit resolution, then the minimum required transfer rate is 10 MHz * 2.2 times * 12 bits * 2 (dual) = 528 Mbps (Nike). According to the test theorem, it is calculated based on 2.2 times higher than 2 times the actual signal band) or due to the limitation of the SAW filter, a transmission rate of 50MHz * 12bit * 2 (dual) = 1.2Gbps is required.

In other words, by adjusting the frequency of the multipath received signal to an intermediate frequency based on the SAW filter, the center frequencies of all signals are fixed to be the same. As the number increases, it is inevitable to process at a higher transmission speed as described above.

In particular, although the actual speed is 528Mbps as shown in the above example, even though it can be sufficiently transmitted by UTP (STP or 1Gbps or less optical cable, UTP) cable, the existing method requires the use of high speed and expensive optical cables and optical transceivers of 1Gbps or more. .

In addition, the recent mobile communication system performs a plurality of wireless services at the same time to increase the number of analog-to-digital converter, the higher the transmission rate is required as the number of wireless services to accommodate.

On the other hand, the signal bandwidth used by the actual data for the communication resources operated at high transmission rates is very small, which causes inefficient operation, and provides a factor of increasing the cost and power consumption of equipment for supporting high transmission rates. .

Korean Patent Publication No. 2009-0077138

In order to solve the above problems, an object of the present invention is to reduce relay data by converting a signal processing method that has been processed in parallel to a low sampling frequency.

In addition, the present invention is to reduce the number of A / D, D / A converters, simplify the configuration of the internal logic unit by performing parallel processing due to the constraint of the SAW filter in a serial manner to reduce the repeater cost and reduce the operating power. The purpose is.

In order to achieve the above object, a signal for a plurality of wireless communication services or a signal for a MIMO service is converted into an intermediate frequency signal to convert from analog to digital signals or from digital signals to analog signals. The repeater for relaying a radio signal through a transmission medium includes a down converter for converting received radio signals so as to be spaced apart only by a predetermined guard interval and having different center frequencies, respectively, and a center of the received signal connected to the down converter, respectively. A receiving SAW filter for filtering a predetermined signal band based on frequency, a combiner for combining signals having a different center frequency from each receiving SAW filter and separated by a guard interval into a single line, and spaced apart by a predetermined guard interval A plurality of signals in each set band A separate transmission SAW filter, an upconverter for upconverting the signal passing through the transmission SAW filter to a different value so as to be the original wireless communication frequency, and digitally converting the signal of the combiner to be transmitted through a transmission medium, And a signal processor for converting a digital signal received through the transmission medium into an analog signal and providing the converted SAW filter.

In this case, the plurality of up-converters and down-converters may include a phase locked loop (PLL) as many kinds of center frequencies as necessary.

In addition, the signal processor extracts the actual transmission data from the transmission medium management unit physically connected to the transmission medium and the data received through the transmission medium management unit, and transmits the signal of the combine unit digitally converted to the transmission medium management unit for the transmission medium A logic unit for converting and transmitting data into a data; and a converter unit for converting a signal of the combine unit into a digital unit and transmitting the digital unit; converting the actual transmission data obtained through the logic unit into an analog signal and providing the analog signal to the transmission SAW filter. can do.

In addition, the transmission medium may be at least one of a physical layer transmission medium including a UTP cable and an optical cable.

In addition, the wireless communication frequency may correspond to a band used in at least one of CDMA, WCDMA, LTE, LTE-Adavance, Over 4G, Wifi, Bluetooth.

The apparatus may further include a transmission gain unit configured to transmit a signal filtered from the transmission SAW filter to the up-converter by adjusting a gain according to outputs of a plurality of wireless communication services.

In addition, by adjusting the gain of the signal received through the duplexer to equally adjust the input level of a plurality of wireless communication services, and the RF gain unit for transmitting the adjusted signal to the downconverter, and the signal filtered from the receiving SAW filter The apparatus may further include a reception gain unit configured to adjust the same according to a preset input level and transmit the same to the combiner unit.

In addition, the combiner may further include a reception signal level adjusting unit for adjusting the signal level according to the dynamic range of the A / D converter included in the signal processing unit.

In addition, the apparatus may further include a transmission signal level adjusting unit for adjusting the signal sampled by the signal processing unit to a predetermined signal level and transmitting the signal to the transmission SAW filter.

In order to achieve the above object, a signal for a plurality of wireless communication services or a signal for a MIMO service is converted into an intermediate frequency signal to convert from analog to digital signals or from digital signals to analog signals. In order to reduce the transmission speed of a repeater which relays a radio signal through a transmission medium, a radio signal of different wireless service bands received through a transmitter may be spaced apart only by a preset guard interval through a down converter, and may have different center frequencies. And a second step of filtering the predetermined signal band based on the center frequency of the signal received through the receiving SAW filter respectively connected to the down converter, and a different center frequency from each of the receiving SAW filters. Signals separated by the guard interval Through the bar, it converts the third step, a signal of said keombain binding to a single line to a digital to include a fourth step of transmitting over a transmission medium.

In this case, the first step may further include the step of transmitting the radio signal received through the duplexer through the RF gain unit to adjust the input level of a plurality of wireless communication services to the same by transmitting the same to the down converter.

The method may further include equally adjusting a signal filtered from the reception SAW filter according to a preset input level through the reception gain unit between the second and third steps.

According to another embodiment of the present invention, a signal for a plurality of wireless communication services or a signal for a MIMO service is converted into an intermediate frequency signal and converted from an analog to a digital signal or a digital signal to an analog signal. The method for reducing the transmission speed of a repeater for relaying a wireless signal through a transmission medium includes: converting a digital signal received through the transmission medium into an analog signal through a signal processor and providing the same to a plurality of transmission SAW filters. And a second step of separating a plurality of signals spaced by a predetermined guard interval through the transmission SAW filter into predetermined bands, and a signal passing through the transmission SAW filter through an upconverter connected to each transmission SAW filter. A third step of up-converting each to a different value to be the original radio frequency And a fourth step of transmitting the upconverted wireless communication signal through a transmitter.

In this case, the method may further include amplifying the upconverted wireless communication signal through an amplifier between the third and fourth steps.

The method may further include transmitting a signal, which is filtered through the transmission SAW filter, between the second step and the third step according to the output of the plurality of wireless communication services through the transmission gain unit to the upconverter. Can be.

The present invention can reduce the number of analog-to-digital converters by adjusting the center frequency of each signal differently in consideration of the guard interval between a plurality of wireless services or MIMO signals, and processing the plurality of signals as continuous signals in the frequency domain. The transmission rate can be reduced and optimized for bandwidth, so that a low-cost transmission medium can be used.

In addition, the present invention can minimize the resources for signal processing of a plurality of radio signals has the effect of greatly reducing the system configuration cost.

In addition, the present invention can be easily integrated in consideration of the guard interval in one intermediate frequency signal through the adjustment of the center frequency even if the number of wireless services is increased, so it is low in a system integrating a plurality of communication signals such as a wireless service or MIMO to accommodate. As a result, it is possible to expand the number of wireless services.

1 is a view showing the configuration of a general repeater.
2 is a configuration diagram of a conventional repeater.
3 is a diagram illustrating a signal processing method of a conventional repeater.
4 is a block diagram of a repeater according to the present invention.
5 to 6 are views illustrating a continuous signal processing method using a guard interval of a repeater according to the present invention.

The present invention converts a signal for a plurality of wireless communication services or a signal for a MIMO service to an intermediate frequency signal and converts the analog signal to a digital signal or a digital signal to an analog signal to repeat the wireless signal through a transmission medium. According to the present invention, a center frequency of a received signal is fixed to an intermediate frequency of an up-down converter and a SAW filter configured in an existing repeater, and relayed at a transmission rate greater than necessary compared to a signal bandwidth of a radio signal transmitted and received through the repeater. There is a problem that the cost of transmission channels for inefficient operation and relay of resources increases.

In particular, because the fixed center frequency must be used to process signals in different wireless service bands in parallel, the cost of repeaters (including RHH and RH) is increased and power consumption is increased due to the increased configuration to support the signals. A new repeater configuration is proposed.

To this end, the present invention by adjusting the center frequency for the radio signals of different bands differently within the range that the aliasing for the signals for a plurality of wireless communication services or signals for MIMO services does not occur based on the intermediate frequency, It can be configured to serially configure the parallel processing of signals at intermediate frequencies of existing repeaters, minimizing the number of converters for analog-digital signal processing, and reducing the resources required to transmit signal bands by half. To reduce the transmission speed.

Based on the above, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a diagram illustrating a configuration of a repeater 2 for reducing transmission speed according to an embodiment of the present invention. As illustrated, the repeater 2 for reducing transmission speed according to the present invention may include a signal processor 100. , Combine unit 500, transmit / receive SAW filters 210 and 220, transmit gain unit 700, receive gain unit 800, receive RF gain unit 900, up / down The converters 310 and 320 may include an amplifier 400 and a duplexer 600.

First, the signal processing unit 100 may relay a signal for a plurality of wireless communication services or a signal for a MIMO service through a separate wired or wireless transmission medium, and for this purpose, converts transmission / reception data or a signal or transmits and receives through a transmission medium. Generate and receive data.

To this end, only a minimum A / D converter is used to sample the wireless reception signal of the signal processor 100 at one time and generate data to be relayed to a transmission medium, and the data received through the transmission medium is the same frequency as the sampling. The furnace can also be converted via a minimal D / A converter and output for wireless transmission.

According to such a simple conversion unit 130, 140 to obtain the data from this to generate a transmission medium data, or to obtain the actual output data from the data received from the transmission medium and the logic unit for transferring to the conversion unit 130 ( The configuration of 120 can be simplified.

The simplification of the signal processing unit 100 is due to the analog signal processing method of the present invention. In the embodiment of the present invention, when converting signals of multiple paths to an intermediate frequency, the converted signal bands have a frequency between the guard intervals. By sequential arrangement on the axis, the signal band is as close as possible to maximize sampling efficiency.

In other words, when down-converting multipath signals, signals of the same band or different bands are continuously arranged by varying the converting frequency slightly so as to be densely arranged in consideration of each band.

For example, FIG. 5 illustrates an example of down-converting a radio signal received through two paths and down-converting two paths by 12 MHz. As shown, if the bandwidths of the plurality of signals are 10 MHz and the guard interval is set to 2 MHz to prevent aliasing between the plurality of signals, the signal bands of the two paths may be 22 MHz.

In fact, for dual systems with two 10MHz signal bandwidths and 12-bit resolution, the minimum required transfer rate is 10MHz * 2.2x * 12bit * 2 (dual) = 528Mbps, but conventional repeater configurations typically have a medium 62.5MHz ( IF) frequency, and the resulting transmission rate requires 50MHz * 12bit * 2 (dual) = 1.2Gbps due to the limitation of SAW filter. However, when the two path signals are continuously arranged as described above, the SAW filter frequency does not need to be considered because the frequency (oversampling) for sampling the corresponding signal band almost reaches the SAW filter limit frequency.

That is, the transmission rate for the signal of FIG. 5 is (10 MHz + 2 MHz (guard interval) + 10 MHz) x 2.2 times x 12 bits = 580 Mbps, which can reduce the transmission rate almost close to the minimum required transmission rate.

In addition, the guard interval may be varied in consideration of the aliasing between signals according to the bandwidth of the plurality of signals and the effects of combining the signals, the mutual effect of minimizing the number of logic of the filter, and the guard interval of the radio signal included in the plurality of signals It is desirable to select a guard interval of up to 1 MHz and to sample lower than the adopted transmission line, such as UTP or low light.

Referring again to FIG. 4 as an example, when a plurality of signals having different wireless communication frequencies are received by the down converter 320 through the duplexer 600, the down converter 320 is a reception frequency at a predetermined center frequency, respectively. Is lowered, and the plurality of signals passing through each down converter 320 are converted to be spaced apart at guard intervals and have different center frequencies.

That is, the down converter 320 may lower the wireless communication frequency of a plurality of signals to an intermediate frequency band and differently set each signal band so as to be spaced apart by a guard interval.

Thereafter, the down converter 320 transmits a plurality of down-converted signals having different frequencies to the receiving SAW filter 220 connected to each down converter, and each of the receiving SAW filters 220 is connected to the down converter 320. Through the filtered signal through the predetermined signal band can be obtained a signal corresponding to the signal band for each path.

In this case, the plurality of down converters 320 may be configured as a phase locked loop (PLL) as much as the type of down-converting frequency required.

Next, each of the received SAW filters 220 transmits the filtered signal to the combiner 500, and the combiner 500 has a center frequency different from each of the received SAW filters 220 and is equal to a guard interval. A plurality of spaced apart signals may be combined and transmitted as a continuous signal on a single line. That is, a signal obtained by mixing a plurality of frequencies is obtained in the time domain.

Thereafter, the combiner 500 transmits the mixed signal to the signal processing unit 100, and the signal processing unit 100 converts the mixed signal to a preset sampling frequency by analog-to-digital converting the base station through the transmission medium. It can be transmitted to a network network (hereinafter, network network) such as an optical line or a UTP line.

In this case, since the mixed signal received through the combiner between the combiner 500 and the signal processor 100 is a signal in which radio signals corresponding to a plurality of wireless communication services are combined, signal levels of the respective radio signals are different. Accordingly, in the process of integrating this into one mixed signal, the signal level may be out of the dynamic range of the A / D converter 140 included in the signal processor 100. Accordingly, a part of the mixed signal may be filtered during the A / D conversion.

In order to prevent this, the reception signal level adjusting unit 1020 for adjusting the level of the mixed signal according to the dynamic range of the A / D converter 140 is between the A / D converter 140 and the reception SAW filter 220. It can be further configured, thereby solving the problem that the signal is lost.

In addition, since the present invention can easily adjust the levels of the plurality of radio signals by using only one reception signal level adjusting unit 1020 for a mixed signal in which a plurality of radio signals transmitted to the A / D converter 140 are integrated. In addition, as shown in FIG. 2 for adjusting the existing signal level, the complexity of the system may be greatly improved and the configuration cost may be greatly reduced as compared with the configuration in which the plurality of gain units 70 are required.

Meanwhile, the signal received by the transmission medium through the base station or the network network is also data obtained by sampling a signal in which multipath signals are mixed at different frequencies, and the signal processing unit 100 is configured to receive the data received through the transmission medium. Separating the actual data and converting the analog data to the same frequency and resolution as the sampling frequency is transmitted to the transmission SAW filter 210, wherein the transmission SAW filter 210 is a different center of the multi-band signal included in the analog signal It may be composed of a plurality so as to correspond to each frequency.

That is, each of the transmission SAW filter 210 may be preset in the center frequency so as to correspond to the center frequency of the signals of the plurality of paths included in the continuous signal, so that each transmission SAW filter 210 is different from each other Can be set to a frequency.

Accordingly, each transmission SAW filter 210 receives the signal and filters a predetermined signal band based on its filtering frequency to distinguish the signal for each path.

In this case, the signal level of the mixed signal restored through the D / A converter 130 of the signal processing unit 100 needs to be amplified for output. For this purpose, the plurality of transmission SAW filters 210 and the signal processing unit ( A transmission signal level adjusting unit 1010 may be further configured as shown between 100 and 100, and sets the signal level of the mixed signal sampled through the D / A converter 130 of the signal processing unit 100 to a preset level. By adjusting and transmitting to the transmission SAW filter 210, the separation may be easily performed in the transmission SAW filter 210.

At this time, the transmission signal level adjusting unit 1010 performs a function of properly adjusting the level of the signal output from the D / A converter 130 to the SAW filter 210. In this case, the structure of the gain unit constituting the transmission signal level adjusting unit 1010 can be simplified as compared with the existing configuration.

On the other hand, the signal separated and filtered from the transmission SAW filter 210 is transmitted to a plurality of transmission gain units 700 respectively connected to the transmission SAW filter 210, each transmission gain unit 700 is a different wireless communication It has a function to adjust the gain (Gain) for each wireless communication service so that it can be adjusted to the output of the service, the controlled signal is transmitted to the up-converter (310). In addition, each upconverter 310 can be up-converted to different values so as to be the original wireless communication frequency of each signal, and can be easily restored to the same signal as the first received signal.

In this case, the wireless communication frequency may include CDMA, WCDMA, LTE, LTE-Advance, Over 4G, Wifi, Bluetooth. In addition, the plurality of up-converters 310 may be configured as PLL (phase locked loop) by the number of required center frequencies.

Thereafter, each upconverter 310 may amplify by transmitting a signal to the amplifier 400, the amplified signal may be transmitted to the outside through the duplexer 600.

As a result, while a plurality of existing SAW filters are processed in parallel with respect to the same center frequency to increase the transmission speed, the transmission SAW filter 210 according to the present invention has a different center frequency set so that the transmission SAW among the plurality of signals included in the continuous signal. Signal bands having the same center frequency as the center frequency of the filter 210 can be filtered, so that signals of different wireless services or signals of the MIMO band can be easily separated and greatly reduce communication resources used in the existing parallel processing. can do.

Through such a configuration and process, when transmitting a signal received through the transmission medium to the terminal, the transmission speed may be reduced when transmitting a transmission medium through the signal received through the terminal as well. .

Referring to FIG. 6, as described above, a plurality of signals received from the terminal that has passed through the down converter 320 and the reception SAW filter 220 are transmitted from node A and node B connected to each reception filter in FIG. 4. As in the measured signal, they are spaced apart from each other by a guard interval and converted to have different center frequencies.

In addition, the combiner 500 may combine a plurality of signals received from each of the receiving SAW filters 220, and the combined signals may be combined in terms of frequency, such as the signals measured at node C of FIG. It can be seen that they are separated by a guard interval and are combined into successive signals having different center frequencies.

In this case, applying the above-described embodiment of the dual system having the signal bandwidth of 10MHz, even when transmitting a signal from the terminal to the transmission medium (10MHz + 2MHz (guard interval) + 10MHz) × 2.2 times × 12bit = 580Mbps Since only the transmission speed of is required, the transmission speed can be significantly reduced.

On the other hand, the signal processing unit 100 is physically connected to the transmission medium and the transmission medium management unit 110 for transmitting and receiving signals, and extracts the data to be actually transmitted from the data received through the transmission medium management unit, to the transmission medium management unit A logic unit 120 that converts the digitally converted combiner signal into data for a transmission medium, and converts the combiner signal into a digital unit and transmits the signal to the logic unit 120 and transmits the logic unit 120. The conversion unit 130 and 140 may be configured to convert the actual transmission data obtained through the analog signal to the transmission SAW filter.

At this time, due to the continuous signal processing of the plurality of signals as described above, while the conventional configuration requires a plurality of analog to digital converter for parallel processing, the present invention is between the transmission and reception SAW filter (210, 220) and logic unit 120 Since only one converter (130, 140) corresponding to the transmission and reception, respectively, can be configured, the number of equipment configurations can be greatly reduced.

Of course, the number of converters can be increased if the number of paths is increased or the communication bands for each path are increased in consideration of the sampling rate in consideration of the sampling rate. However, if the signals have a bandwidth of at least 20 MHz, the number of converters is higher than that of the conventional band. It can be reduced to less than half.

In addition, the transmission medium connected to the transmission medium management unit 110 can be configured with a relatively inexpensive UTP cable due to the reduction in the transmission speed can further reduce the system configuration cost. At this time, if the signal bandwidth required for the service increases, it is a matter of course that the optical cable can be applied to the transmission medium.

In addition, the RF gain unit 900 and the reception gain unit 800 may perform a function of matching the received powers of different input levels received through the duplexer 600 to the same level in the combiner 500. This is because when the input radio signal of another level where the difference in input level is input largely exists, due to the limitation of the dynamic range that the A / D converter 140 can accommodate, the wireless communication signal having a relatively low input signal level is generated. As a result of having a relatively low SNR is generated, even if a wireless communication signal of a relatively low signal level is applied, it is adjusted to the same signal level by adjusting the gains of the RF gain unit 900 and the reception gain unit 800. In this way, independent wireless communication signals received at different input levels can ensure stable SNR.

That is, the transmit gain 700 and the amplifier 400 of the forward link can be adjusted for each output to be serviced, and thus have a configuration that can operate in a separate configuration for each service frequency, and the receive gain 800 of the reverse link. And the RF gain unit 900 configures each A / D input level in the same manner so that the input level of the A / D converter 140 can be operated identically under the rated input when different levels of input signals are input. Can maximize the service quality.

2: repeater 100: signal processing unit
110: transmission medium management unit 120: logic unit
130, 140: analog to digital converter
210: transmit SAW filter 220: receive SAW filter
310: up-converter 320: down-converter
400: amplifier 500: combine unit
600: duplexer 700: transmission gain unit
800: receiving gain section 900: receiving RF gain section
1010: transmit signal level adjuster 1020: receive signal level adjuster

Claims (15)

In the repeater for relaying a wireless signal through a transmission medium by converting a signal for a plurality of wireless communication services or a signal for a MIMO service to an intermediate frequency signal to convert from analog to digital signals or from digital signals to analog signals,
A down converter for converting the received radio signals to be spaced apart only by a predetermined guard interval and to have different center frequencies;
A reception SAW filter connected to each of the down converters and filtering a predetermined signal band based on a center frequency of a received signal;
A combiner for combining signals having a different center frequency from each of the received SAW filters and spaced apart by a guard interval into a single line;
A transmission SAW filter for separating a plurality of signals spaced by a predetermined guard interval into respective set bands;
An upconverter for upconverting the signal passing through the transmission SAW filter to a different value to be the original wireless communication frequency; And
A signal processor converting the combiner signal into a digital signal and transmitting the same through a transmission medium, converting the digital signal received through the transmission medium into an analog signal, and providing the analog signal to the transmission SAW filter;
The signal processing unit,
A transmission medium management unit physically connected to the transmission medium;
A logic unit which extracts data to be actually transmitted from data received through the transmission medium manager, converts a signal of the combine unit digitally converted to the transmission medium manager into data for transmission medium; And
And a converter unit for converting the combiner signal into a digital unit and transmitting the digital unit to the logic unit, and converting the actual transmission data obtained through the logic unit into an analog signal and providing the analog signal to the transmission SAW filter.
The method according to claim 1,
The up-converter and down converter includes a PLL (phase locked loop) as the kind of the center frequency required.
delete The method according to claim 1,
The transmission medium is a repeater for reducing the transmission rate, characterized in that at least one of the physical layer transmission medium including a UTP cable, optical cable.
The method according to claim 1,
The wireless communication frequency repeater for reducing the transmission rate, characterized in that corresponding to the band used in at least one of CDMA, WCDMA, LTE, LTE-Adavance, Over 4G, Wifi, Bluetooth.
The method according to claim 1,
And a transmission gain unit configured to adjust a gain filtered from the transmission SAW filter to an output of a plurality of wireless communication services and transmit the gain to the upconverter.
The method according to claim 1,
An RF gain unit adjusting an input level of a plurality of wireless communication services by adjusting a gain of a signal received through a duplexer and transmitting the adjusted signal to the downconverter; And
A reception gain unit for adjusting the signal filtered from the reception SAW filter in the same manner according to a predetermined input level and transmitting the same to the combiner unit;
Repeater for reducing the transmission rate, characterized in that it further comprises.
The method according to claim 1,
And a reception signal level adjusting unit for adjusting the signal level according to the dynamic range of the A / D converter included in the signal processing unit.
The method according to claim 1,
And a transmission signal level adjustment unit for adjusting the signal sampled by the signal processing unit to a predetermined signal level and transmitting the signal to the transmission SAW filter.
Transmission speed of repeater that repeats wireless signal through transmission media by converting signal for multiple wireless communication service or signal for MIMO service into intermediate frequency signal and converting from analog to digital signal or digital signal to analog signal In the method for relief,
A first step of converting radio signals of different wireless service bands received through the transmitter to be spaced apart only by a predetermined guard interval through the down converter and having different center frequencies;
A second step of filtering a predetermined signal band based on a center frequency of a signal received through a receiving SAW filter respectively connected to the down converter;
Coupling a signal having a different center frequency from each of the received SAW filters and spaced apart by a guard interval into a single line through a combiner; And
A fourth step of converting the combiner signal into a digital signal and transmitting the digital signal through a transmission medium;
The first step may include transmitting a signal received through a duplexer to the down converter by adjusting a gain through an RF gain unit to equally adjust input levels of a plurality of wireless communication services. .
delete The method of claim 10,
And adjusting the filtered signal from the receiving SAW filter equally according to a predetermined input level through the receiving gain section between the second and third steps. .
delete delete delete

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