JPH04216218A - Communication system - Google Patents

Abstract

PURPOSE:To miniaturize, economize a delay equalizer, which is conventionally provided at a base station or an intermediate repeating point to equalize delay deviation caused by equalizing an amplitude, and to simplify the configuration of the base station. CONSTITUTION:The delay equalizers provided at a base station 10 or the intermediate repeating point conventionally are provided as base band delay equalizers 138 and 148 at final repeating points 13 and 14 where modulators/ demodulators 134, 135, 144 and 145 are provided. Since the delay equalizer is a base band, the circuit configuration is simplified, miniaturized and economized as well as facilitating the design. Further, it is not necessary to provide the delay equalizers at the base station or the intermediate repeating point only corresponding to the number of amplitude equalizers.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system that requires relaying for amplitude equalization that causes delay deviations. especially,
The present invention relates to a technology for compensating for delay deviations associated with amplitude equalization in communication systems using wireless lines.

0002

2. Description of the Related Art Hereinafter, a typical mobile communication system will be described as an example of the prior art as shown in FIG. In this example, mobile device A
A case will be explained in which communication is carried out between the mobile terminal B and the terminal relay station 13 equipped with a modem and a modem, and between the mobile station B and the terminal relay station 14 equipped with a modem and a modem.

[0003] The signal of the mobile device A received by the antenna 101 of the base station 10 is transmitted to the transmitting/receiving device 102 and the receiving device 10.
3, amplitude equalizer 104, delay equalizer 105, transmitting device 106, transmitting/receiving device 107, signal transmission equipment 1
A terminal relay station 13 communicating with mobile device A via 1
sent to. At the terminal relay station 13, the transmitting/receiving shared device 13
2, after passing through the receiving device 133, the demodulating device 134
It is demodulated by The transmission signal from the terminating relay station 13 is transmitted to a modulation device 135 , a transmission device 136 , and a transmitting/receiving device 13
2 to the base station 10 via the signal transmission equipment 11, and the transmitting/receiving device 107 of the base station 10 and the receiving device 10
8, the transmitting device 109, the transmitting/receiving device 102, and the antenna 101. Similarly, signals are transmitted and received between the mobile device B and the terminal relay station 14.

[0004] In this conventional example, the operation of the amplitude equalizer 104 provided in the base station 10 will be described. If there is a level difference between the reception levels of mobile stations A and B as shown in FIG.
The signal commonly amplified by the transmitter 106 of the base station 10 is
This causes a problem in that the communication quality of a mobile device with a low reception level is degraded, and the signal of a mobile device with a low reception level is susceptible to the influence of nonlinear distortion caused by the signal of a mobile device with a high reception level. To solve this problem, the amplitude equalizer 104 equalizes both reception levels so that they are approximately equal. Furthermore, if the difference in the transmission frequencies assigned to mobile stations A and B is small, the amplitude equalizer 104 requires a resonant filter with high sharpness Q, so there is a delay caused by the amplitude equalizer 104 as shown in FIG. A frequency characteristic occurs, and a delay equalizer 105 is provided to compensate for this.

[0005]

[Problems to be Solved by the Invention] In this conventional technology, as the number of mobile terminals increases, the number of amplitude equalizers 104 increases, and the delay equalizer 105 also increases in proportion to the number of amplitude equalizers. There is a problem that the configuration of the base station becomes complicated because the number of base stations required is as many as the base station. Additionally, a delay equalizer 105 provided in the base station
Because the circuit configuration is in the radio frequency band or intermediate frequency band, the circuit configuration tends to be more complicated than that in the baseband.

For example, FIG. 5 shows an example of the reception level at the base station 10 when there are five mobile stations and
An amplitude equalizer 10 converts the reception level drop that occurred in 5 into each band.
4 shows the delay equalization frequency characteristics after amplitude equalization. The transmission frequency interval assigned to the mobile device is small,
If a resonant filter with a high sharpness Q is used in the amplitude equalizer 104, delay frequency characteristics occur in bands 1 and 4. When performing delay equalization, if the frequency interval is small, use a filter, etc. to separate each band, equalize the delay frequency characteristics of each band, and then combine the signals of each band. Therefore, the entire band must be compensated at once.

[0007] Therefore, this delay frequency characteristic is
If the delay equalizer 105 of 0 is used to equalize all at once, even when equalizing the delay frequency characteristics of only band 1, the delay equalizer 105 needs to consider the delay frequency characteristics of all bands. The circuit configuration of the device 105 becomes complicated.

The present invention simplifies the configuration of a base station or relay station by providing a delay equalizer that compensates for delay frequency characteristics at a terminal relay station as a baseband delay equalizer. The purpose of the present invention is to provide a communication method that can be easily configured.

[0009]

[Means for Solving the Problems] The first feature of the present invention is that
A base station equipped with a transmitting/receiving device for transmitting and receiving signals to and from a mobile device and an amplitude equalizer that equalizes the amplitude deviation of a received signal, and a base station that transmits and receives signals from or to this base station. In a communication system having a terminal relay station equipped with a transmitting/receiving device that performs modulation and demodulation of transmitted and received signals, and a terminating relay station that includes a modulator and demodulator that modulates and demodulates transmitted and received signals, a delay etc. that compensates for delay deviations that occur in a high frequency band or an intermediate frequency band due to amplitude equalization of the base station. The present invention is characterized in that the equalizer is provided as a baseband delay equalizer at the termination relay station.

[0010] The second feature is that the relay station is equipped with a transmitting/receiving device for transmitting and receiving signals with other relay stations, and an amplitude equalizer for equalizing the amplitude deviation of the received signal; In a communication system that has a terminal relay station equipped with a transmitting/receiving device that transmits and receives signals from a station or signals to this relay station, and a modulator/demodulator that modulates and demodulates the transmitted and received signals, the high frequency band increases due to amplitude equalization of the relay station. Alternatively, a delay equalizer for compensating for delay deviations occurring in the intermediate frequency band is provided as a baseband delay equalizer of the termination relay station.

[0011]

[Operation] Conventionally, the delay equalizer that compensates for the delay frequency characteristics of the amplitude equalizer of the base station or relay station is installed as a baseband delay equalizer at the termination relay station, and the Compensated for delay frequency characteristics. Therefore, a delay equalizer can be realized using a baseband circuit configuration, which simplifies the circuit, facilitates design, and enables miniaturization and economicalization. Further, since it is not necessary to provide the number of delay equalizers corresponding to the amplitude equalizers provided in the base station, the configuration of the base station is simplified.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram illustrating the configuration of a first embodiment of the present invention. In this first embodiment, an antenna 10 serves as a transmitting/receiving device for transmitting and receiving signals to and from a mobile device.
1, a base station 10 comprising a transmitting/receiving device 102, a receiving device 103, a transmitting device 109, and an amplitude equalizer 104 that equalizes the amplitude deviation of a received signal, and this base station 10
Transmitting/receiving devices 132 , 142 , receiving devices 133 , 143 , and transmitting devices 136 , 146 as transmitting/receiving devices that transmit and receive signals from or to this base station
In a communication system having terminal relay stations 13 and 14 having demodulators 134 and 144 and modulators 135 and 145 as modulators and demodulators that perform modulation and demodulation of transmitted and received signals, the present invention is characterized in that the amplitude of the base station, etc. Delay equalizer 138 that compensates for delay deviations caused by
, 148 are provided at the terminal relay stations 13 and 14.

Next, the operation of the first embodiment will be explained.

The signal received by the antenna 101 of the base station 10 passes through the transmitting/receiving device 102 and the receiving device 103, and then is input to the amplitude equalizer 104, and is transmitted to the mobile stations A and B.
levels are approximately equal. At this time, if the difference between the transmission frequencies assigned to mobile stations A and B is small, the amplitude equalizer 1
04, a delay frequency characteristic occurs. The signal passed through the amplitude equalizer 104 is sent to the transmitting device 106.
, through the transmitting/receiving device 107 and the signal transmission device 12,
Terminal relay stations 13 and 14 communicating with mobile devices A and B
transmitted to. At the terminal relay stations 13 and 14, the transmitting and receiving devices 132 and 142 are connected to the receiving devices 133 and 143.
The received signal is compensated for the delay frequency characteristics of the amplitude equalizer 104 by the delay equalizers 138, 148. The signal whose delay frequency characteristics have been compensated is sent to demodulators 134, 1
44, the signals from mobile stations A and B are demodulated.

Signals from the terminal relay stations 13 and 14 are transmitted from modulators 135 and 145 to transmitters 136 and 146.
The signal is transmitted to the base station 10 via the transmitting/receiving devices 132 , 142 and the signal transmission equipment 11 . Base station 1
0, the transmitting/receiving device 107 , the receiving device 108 , the transmitting device 109 , the transmitting/receiving device 102 , the antenna 10
1 to mobile stations A and B.

In this embodiment, as shown in FIG.
Even if there are 5 mobile stations at 0, the terminal relay station 13,
14, delay equalization is performed for each band 1 to 5, so
It is only necessary to consider each band in which communication is being performed, and there is no need to design a delay equalizer by considering the delay frequency characteristics of all bands as in the past.
48 circuit design becomes easier than in the conventional method.

FIG. 2 is a diagram showing the configuration of a second embodiment of the present invention. The first embodiment described above was applied to a case where there was a difference in reception levels between mobile stations A and B, but this second embodiment is an example for fixed communication, and is applied to a case where there is a difference in reception level between mobile stations A and B, but this second embodiment is an example in fixed communication, and is applied to a case where there is a difference in reception level between mobile stations A and B. This is an example applied when fading occurs in the B system and a difference occurs in the reception level.

This second embodiment uses an antenna 201 as a transmitting/receiving device for transmitting and receiving signals with other relay stations.
, 211 , shared transmitting/receiving devices 202 , 207 , receiving devices 103 , 208 , transmitting devices 206 , 209
and an amplitude equalizer 204 that equalizes the amplitude deviation of the received signal.
, 214, and a similar intermediate relay station 30, and an antenna serving as a transmitting/receiving device that transmits and receives signals from these intermediate relay stations or signals to this intermediate relay station. 131, 14
1. Transmitting/receiving devices 132, 142, receiving device 13
3, 143, demodulation devices 134, 144, and modulation devices 135, 145 for modulating and demodulating the transmitting/receiving device. A delay equalizer 13 compensates for delay deviation due to amplitude equalization of the intermediate relay station.
8,148.

Next, the operation of this second embodiment will be explained.

The intermediate relay station 20 receives systems C and D (via line) with narrow frequency intervals from the adjacent intermediate relay station 30. At this time, intermediate relay station 20 and intermediate relay station 3
Suppose that fading occurs in the transmission path between 0 and 0, and the reception level of system D becomes lower than the reception level of system C. The signal received by the antenna 211 of the intermediate relay station 20 passes through the transmitting/receiving device 207 and the receiving device 208, and then is input to the amplitude equalizer 214, where the levels of systems C and D having a narrow frequency interval are equalized almost equally. Ru. The signal that has passed through the amplitude equalizer 214 is transmitted to the next intermediate relay station by the transmitter 209. Then, it is relayed to a terminal relay station 13 equipped with a modem device, and an antenna 131,
After passing through a transmitting/receiving device 132, a receiving device 133, and a delay equalizer 138 that compensates for the delay deviation of the amplitude equalizer, the transmitted signal is demodulated by a demodulating device 134. The transmission signal from the terminating relay station 13 is transmitted from the modulating device 135, the transmitting device 136, the transmitting/receiving device 132, and the antenna 131, and is transmitted via the intermediate relay station 20 and the intermediate relay station 30 to the terminating relay station 14 equipped with a modem device. sent to. At the terminal relay station 14, a delay equalizer 148 compensates for the delay deviation of the amplitude equalizer at the intermediate relay station.

[0022]

[Effects of the Invention] As explained above, the circuit configuration is simplified by compensating the delay frequency deviation caused by the amplitude equalizer of the base station or intermediate relay station by the baseband delay equalizer of the terminating relay station. This makes the design easier, making it possible to make it smaller and more economical. Additionally, in the past, it was necessary to increase the number of delay equalizers in response to the increase in the number of mobile devices communicating with the base station, but by installing them at the terminal relay station, the number of mobile devices communicating with the base station increases. There is no need to increase the number of delay equalizers, which has the effect of simplifying the base station configuration.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a first embodiment of the present invention.

FIG. 2 is a diagram showing the configuration of a second embodiment of the present invention.

FIG. 3 is a diagram showing a conventional configuration.

[Figure 4] Amplitude delay frequency characteristics of the amplitude equalizer.

[Figure 5] Delay frequency characteristics when performing amplitude equalization of multiple bands.

[Explanation of figure symbols]

10 Base station 11 Signal transmission equipment 13 14 Termination relay station 20 30 Intermediate relay station 101 131 141 201 211 301 3
11 Antenna 102 107 132 142
202 207 302 307 Sending/receiving shared device 1
03 108 133 143 203 208 30
3 308 Receiving device 104 204 214 304
314 Amplitude equalizer 105 138 148
Delay equalizer 106 109 136 146 206
209 306 309 Transmitting device 134 14
4 Demodulator 135 145 Modulator

Claims (2)

[Claims] Claim 1: A base station comprising a transmitting/receiving device for transmitting and receiving signals to and from a mobile device and an amplitude equalizer for equalizing the amplitude deviation of a received signal, and a signal from this base station or this base station. In a communication system that has a terminal relay station equipped with a transmitter/receiver that transmits and receives signals to and from a terminal and a modulator/demodulator that modulates and demodulates the transmitted and received signals, the delay deviation that occurs in the high frequency band or intermediate frequency band due to the amplitude equalization of the base station. A communication system characterized in that a delay equalizer for compensating for is provided as a baseband delay equalizer of the terminal relay station. Claim 2: A relay station comprising a transmitting/receiving device for transmitting and receiving signals to and from another relay station and an amplitude equalizer for equalizing the amplitude deviation of the received signal, and a signal from the relay station or this relay station. In a communication system that has a terminal relay station equipped with a transmitter/receiver that transmits and receives signals to and from the relay station and a modulator/demodulator that modulates and demodulates the transmitted and received signals, the error occurs in the high frequency band or intermediate frequency band due to amplitude equalization of the relay station. A communication system characterized in that a delay equalizer that compensates for delay deviation is provided as a baseband delay equalizer of the terminal relay station.