KR100661501B1 - Divergence controlling device of asynchronous basestation system equipped with the time delay compensation function - Google Patents

Abstract

The present invention includes a time adjusting unit at the output end of the transmission processing unit, and corrects the relative time delay of each call signal output through a plurality of transmission paths through the time adjusting unit, thereby eliminating the inconvenience of replacing the corresponding board or components. Since the time delay of the path is adjusted accurately, it provides a divergence control device of an asynchronous base station system having a time delay compensation function that can significantly improve the call quality of the base station transmitter.

Description

Diversity controlling device of asynchronous basestation system equipped with the time delay compensation function

      1 is a block diagram illustrating the structure of a conventional invention.

      2 is a block diagram illustrating the structure of the present invention.

      Figure 3 is a detailed block diagram of the time adjusting unit of the present invention.

<Detailed Description of Codes>

1: baseband processor 2: radio transceiver

3: signal measuring unit 4: control unit

5: Path A part 6: Path B part

7: Modem 8: Link

9A-B: Transmission Signal Processing Unit 10A-B: Time Control Unit

11A-B: Low Noise Amplifier 12A-B: Front End (FE)

13: Antenna A 14: Antenna B

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a divergence control device of an asynchronous base station system having a time delay compensation function. In particular, the present invention relates to a relative time delay occurring between a plurality of transmission paths provided in a base station for asynchronous transmission diversity. The present invention relates to a divergence control device of an asynchronous base station system having a time delay compensation function that compensates through a time delay means.

In general, wireless data communication refers to a communication function of wirelessly transmitting and receiving various data such as letters, numbers, and images by using a portable terminal capable of wireless transmission and reception. That is, a mobile communication system that exchanges or retrieves data in both directions while moving by using various terminals such as a cellular phone, a portable computer, a facsimile, and a credit card inquiry machine. In order to facilitate such wireless data communication, base station systems capable of relaying communication signals of terminals are usually distributed in a plurality of regions.

However, the base station system as described above is mainly affected by tropospheric fading because its frequency band is 800 to 1800 MHz, and such fading is due to the fact that the radio wave radiated from the transmission antenna is a propagation path. It refers to a phenomenon in which the intensity of an electric field changes from a short period of several tenths of a second to several tenths of a second to a long period of one day to several months due to a change of state. Accordingly, such a base station system generally uses various methods for preventing the fading, and one of such methods is diversity.

For example, such diversity is to receive two or more radio frequency input signals including the same information in duplicate to select a good signal or to combine a plurality of signals. In general, in land-based fixed wireless communication systems, space diversity, frequency diversity, polarization diversity, path diversity, and the like are applied, but dual path diversity is obtained by dualizing a physical transmission relay link. This is a way of selecting a propagation path.

       Then, referring to FIG. 1, the conventional structure of the base station system includes: a baseband processor 51 outputting a predetermined signal by processing a radio call signal transmitted from a terminal and a radio call output from the baseband processor 51; A plurality of angles from the radio transmitter / receiver 52 for processing a high frequency signal through a plurality of paths 54 and 55 to be emitted to the outside and the paths 54 and 55 included in the radio transmitter 52. The signal measuring unit 53 measures the divergence of the high frequency signal.

       The baseband processor 51 includes a modem 56 for modulating and outputting a radio call signal transmitted from a terminal into a digital signal.

       The radio transmitter / receiver 52 further includes a link unit 57 for dividing a radio call signal modulated by the modem 56 into a plurality of paths, and one of a plurality of call signals output from the link unit 57. A path portion 54 which receives only a high frequency and receives a high frequency, and a B path portion 55 which receives a high frequency of another call signal output from the link unit 57 and performs a high frequency processing.

       Meanwhile, the path A 54 includes a transmission processor 58A for high frequency processing of the wireless call signal output from the link unit 57, and a low noise amplifier for low noise amplification of the call signal output from the transmission processor 58A. 59A, and the FE 60A which filters the call signal amplified by the low noise amplifier 59A according to a predetermined band, converts the waveform, and transmits the signal to the antenna.

       The B path unit 55 includes a transmission processor 58B for high frequency processing of the wireless call signal output from the link unit 57, and a low noise amplifier for low noise amplifying the call signal output from the transmission processor 58B. 59B) and the FE 60B for filtering the call signal amplified by the low noise amplifier 59B to a predetermined band, converting the waveform, and transmitting the waveform to the antenna.

       On the other hand, referring to the operation of the base station system as described above, the analog call signal transmitted from the terminal is digitally modulated by the modem 56 in the baseband processor 51 and enters the link unit 57. The link unit 57 divides the input digital signal into an A path part 54 and a B path part 55. The call signal input to the A-path unit 54 is subjected to high frequency processing through the transfer processing unit 58A, and the high frequency processed call signal is low noise amplified by the low noise amplifier 59A. The amplified call signal is filtered and waveform-converted in a predetermined band through the FE 10A and then transmitted to the antenna A 61. At this time, some of the signals transmitted to the antenna A is measured by the signal measuring unit 53.

       The signal divided by the B path part 55 is subjected to high frequency processing through the transmission processor 58B, and the high frequency processed call signal is low noise amplified by the low noise amplifier 59B. The amplified call signal is filtered through a FE 60B in a predetermined band, waveform-converted, and then transmitted to the antenna B 62. In this case, some of the signals transmitted to the antenna B 62 are measured by the signal measuring unit 53.

       Then, through the signal measuring unit 53, the divergence corresponding to the relative time delay occurring in each of the transmission paths 54 and 55 is measured.

       However, in the conventional base station system as described above, since there is no special means for compensating the relative time delay between transmission paths, a transmission error of a call signal frequently occurs, and when a transmission error occurs, the transmission error occurs. Since the corresponding board and parts have to be replaced every time, there was a problem that it was very inconvenient to manage the system.

Accordingly, the present invention has been invented to solve the conventional problems as described above, and includes a time control unit at the output terminal of the transmission processing unit so that each call signal outputted through a plurality of transmission paths is relative to each path through the signal measuring unit. When the divergence corresponding to the time delay is measured and inputted to the controller, the controller compares and analyzes the divergence between the respective paths and outputs a path time correction control signal according to the result of the comparison analysis. The relative time delay is adjusted by correcting the time delay of the corresponding path that requires time delay correction according to the path time control signal of the controller. Therefore, the divergence corresponding to the relative time delay can be obtained without the inconvenience of replacing the corresponding board or components. The purpose is to provide a device that can be easily controlled.                         

       Another object of the present invention is to provide a divergence control device that can cope with the time delay that may occur in all modules without any additional device, and to take into account the relative time delay effect factor due to aging of a part or temperature change. Has its purpose.

       In order to achieve the above object, the present invention provides a baseband processing unit for processing a baseband wireless call signal and outputs a predetermined signal, and a time control unit at a transmission processor output terminal for a call signal input from the baseband processor. Compensating for the delay difference and processing the high frequency signal and transmitting it to the outside through an antenna, a signal measuring unit for measuring the divergence of the plurality of high frequency signals emitted from the wireless transmitting and receiving unit, and measuring through the signal measuring unit The present invention provides a divergence control device of a base station system including a control unit for comparing and analyzing relative time delays between the determined paths and outputting a path time correction control signal according to the result of the comparison analysis.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, the apparatus of the present invention includes a baseband processor 1 for processing a baseband radio call signal and outputting a predetermined signal, and a plurality of paths through which a radio call signal input from the baseband processor 1 is output. The wireless transmitter / receiver 2 and the path A included in the wireless transmitter 2 to adjust the relative time delays occurring in the divided paths and process the high-frequency signals and emit them to the outside through an antenna. The relative time delay difference between the signal measuring unit 3 for measuring the divergence of a plurality of high frequency signals from B (5, 6) and the respective paths 5 and 6 measured through the signal measuring unit 3 And a controller 4 for outputting the path time correction control signal according to the comparative analysis and the result of the comparative analysis.

       The baseband processor 1 includes a modem 7 for modulating and outputting a radio call signal transmitted from a terminal into a digital signal.

       The radio transmitter / receiver 2 further includes a link unit 8 for dividing a radio call signal modulated by the modem 7 into a plurality of paths and one of a plurality of call signals input from the link unit 8. The A path unit 5 and the other one of the plurality of call signals outputted from the link unit 8 are characterized in that they have a function of adjusting the time delay by receiving only the input and outputting a time delay. It has a function that can be adjusted and consists of a B path portion (6) for high frequency processing.

       On the other hand, the A-path unit 5 can time-delay the call processing unit 9A for high frequency processing of the wireless call signal output from the link unit 8 and the call signal output from the transfer processing unit 9A. A low noise amplifier 11A for amplifying a low noise amplifying a call signal outputted by adjusting a relative time delay from the time adjusting unit 10A, and amplifying the low noise amplifier 11A. The FE 12A transmits an antenna to the antenna by filtering the received call signal in a predetermined band and converting the waveform to a predetermined band.

       In addition, the B path part 6 may perform a time delay on the transmission processor 9B for high frequency processing of the wireless call signal output from the link unit 8 and the call signal output from the transmission processor 9B. A time control unit 10B having a function, a low noise amplifier 11B for low noise amplifying the call signal outputted by adjusting the relative time delay in the time control unit 10B, and amplified by the low noise amplifier 11B. It consists of an FE (12B) for filtering the call signal to a predetermined band, converting the waveform to be transmitted to the antenna.

As shown in FIG. 3, the time adjusting unit 10A existing in the path A is based on the path time correction control signal output from the control unit 4 to the call signal input from the transmission signal processing unit 9A. A path time delay compensation unit 10A- 1 comprising a plurality of series-connected flip-flops capable of time delay.

In addition, the time adjusting unit 10B existing in the path B may perform a plurality of time delays according to the path time correction control signal output from the control unit 4 to the call signal input from the transmission signal processing unit 9B. And a B-path time delay compensator 10B- 1 consisting of flip-flops connected in series.

       Meanwhile. Referring to the operation of the divergence control device of the asynchronous base station system with time delay compensation function of the present invention is as follows.

       When the radio call signal modulated by the digital signal in the modem 7 is input to the radio transceiver 2, the link unit 8 in the radio transmitter separates the signal into the A path and the B path, respectively. The high frequency signal processing step is performed by the transmission signal processing units 9A and 9B in the path of. The low noise amplifiers 11A and 11B present in the respective paths are low-noise amplified and input to the FEs 12A and 12B. Then, the FEs 12A and 12B in each path filter the call signal, convert the waveform, and transmit the signal to the antennas 13 and 14 corresponding to the respective paths. At this time, the relative time delay of the high frequency signal transmitted to the antennas 13 and 14 corresponding to the respective paths is measured by the signal measuring unit 3. The time delay measured by the signal measuring unit 3 is output to the control unit 4.

       The controller 4 divides the relative time delay measured by the signal measuring unit 3 into the time of the one step delay. If a fractional value is discarded and only an integer value is taken from the value calculated by the above method, the value becomes a setting value. The calculating of the setting value may be performed through various programs. When the setting value is determined, the controller 4 closes only the switch corresponding to the setting value (for example, SA-7 or SB-7 if the setting value is 7) among the switches of the time control unit corresponding to the relatively fast path. All other switches are opened, and the switch of the time controller corresponding to the relatively backward path controls only the zero switch (SA-0 or SB-0) and all other switches are opened.

Then, in the time adjusting unit 10A, 10B, the corresponding switch is opened or closed according to the switch control method determined by the control unit 4. Then, the call signal of the path to be delayed is output along the closed switch after passing the corresponding number of flip-flops as much as the setting value, and flows along the control path ( 10A- 2 or 10B- 2) and relatively backwards. The corresponding call signal flows along the control path ( 10A- 2 or 10B- 2) without time delay caused by the flip-flop because the switch 0 (SA-0 or SB-0) is closed. Therefore, relative time delay is compensated according to the above method.

       For example, it is possible to delay a time of 16 nS per flip-flop, and assuming that the total number of flip-flops is 16, a total of 260 nS can be adjusted. In this case, the time that one flip-flop can be delayed is called the time of one step delay, and the total time that can be delayed by the total number of flip-flops is called the total delay time. The total delay step (N = 16) is determined according to the total number of flip flops. On the other hand, in the 3GPP standard, the relative time delay difference between A and B paths should be less than 64nS. If, in the signal measuring unit 3, it is determined that the relative time delay difference is 120 nS behind the A path, the controller 4 receives the above information from the signal measuring unit 3 and receives 120 nS (relative time delay). ) Is divided by 16nS (Delayed Base Time). 7 is calculated and the value becomes Setting value. According to the calculated setting value, the control unit 4 switches only the switch 7 of the time controller 10B corresponding to the path B (SB-7), opens the remaining switches, and adjusts the time corresponding to the path A. The switch of the unit 10A gives a command to each of the time adjusting units 10A and 10B to close only the zero switch SA-0 and open the remaining switches. Then, the switch is opened or closed according to the switch control method determined by the controller. Therefore, the signal of the path A flows along the first control path CP1 without the time delay caused by the flip-flop because the switch 0 is closed. The signal of the path B flows along the second control path CP2 after the time delay by the seven flip-flops because the seventh switch SB-7 is closed. Therefore, the signal corresponding to the path A does not undergo a time delay, and the signal corresponding to the path B is delayed by a total of 96 n. The relative time delay of the high frequency signals of the A and B paths from the respective time adjusting units 10A and 10B is output. The difference is 8 nS. This satisfies the specification below 64nS suggested by the 3GPP specification.

       On the other hand, when the multiple series-connected flip-flops delay time, the output of the first flip-flop becomes the input of the second flip-flop and the output of the second flip-flop becomes the input of the third flip-flop. In this way, each call signal flows through the flip-flop, and each flip-flop uses the principle of time delay by the time of one step delay.

       In FIG. 3, the delay step N may be appropriately selected for the PLD (program loading date) size, and the clock may be configured by using the system clock.

As described above, the present invention includes a time control unit at a transmission processor output terminal, and when each call signal outputted through a plurality of transmission paths is measured and inputted to the controller by measuring the time delay of each path through the signal measuring unit, The time delay difference is calculated by considering the setting value considering the time of one step delay and the total delay time. Since the relative time delay is adjusted according to the method controlled in, the relative time delay can be easily controlled without the inconvenience of replacing the corresponding board or replacing the corresponding parts, thereby providing excellent signal and standard quality. In addition, the implementation method is very easy and no additional device is required, so there is little construction cost. In addition, it can cope with the relative time delay that can occur in all modules, and even the relative time delay influence factors due to component aging or temperature change.

Claims (3)

       In the mobile communication base station system having a radio transmitting and receiving unit for high-frequency processing and outputting a radio call signal, The signal measuring unit for measuring the divergence of a plurality of high frequency signals from the radio transmitter and receiver and the relative time delay difference between the respective paths measured by the signal measuring unit are compared and analyzed according to the result of the comparison analysis. Asynchronous base station system having a time delay compensation function comprising a control unit for outputting a correction control signal and a time adjusting unit for correcting the time delay of the corresponding path requiring time delay correction according to the path time control signal of the control unit. Divergence Control The apparatus of claim 1, wherein the time adjusting unit is configured by connecting a plurality of flip-flops having a predetermined time delay in series. delete

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