JP2991194B1 - Multicarrier receiving method and wireless communication device - Google Patents

Abstract

A dynamic range of an automatic gain adjustment circuit in a slave channel section can be reduced even when a difference between a reception level in a master channel section and a reception level in a slave channel section is large, and the circuit configuration is simplified. To be able to Further, even if the carrier cannot be received in the master channel unit, the line is prevented from being disconnected in the slave channel unit. When no carrier is received in any of the master channel unit 10 and the slave channel units 20, 30,..., An automatic gain adjustment amount (AGC data 52) obtained by the master channel unit 10 is used. The automatic gain adjustment of the common unit 40 is performed. Further, the master channel unit 10 or the slave channel units 20, 30,
.. Receives any of the carriers, the common unit is used by using the average value of the automatic gain adjustment amounts (AGC data) obtained in all of the master channel unit 10 and the slave channel units that have received the carrier. Perform 40 automatic gain adjustments.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multicarrier receiving method and a radio communication device, and more particularly to a multicarrier receiving method and a radio communication device having an automatic gain adjustment function for a multicarrier received signal.

[0002]

2. Description of the Related Art At present, a very small earth station (VSAT: Very Small)
A VSAT system, which is a communication system using a plurality of aperture terminals, is used for data transmission, facsimile, voice and image transmission, and the like.

[0003] A VSAT system is a VSAT control earth station (master station) having an antenna of about 5 to 10 m in diameter and an antenna scattered in various places and having an antenna of 2.4 m or less in diameter or major axis and having a diameter of 2.4 m or less. VS to be controlled
This is a network configured between an AT earth station (slave station) and communicates via a communication satellite. Now,
In such a VSAT system, the following wireless communication device is used.

FIG. 2 is a block diagram showing a radio communication apparatus used in a conventional VSAT earth station (slave station). As shown in the figure, the wireless communication device 60 includes a common unit 40, a master channel unit 10, and a plurality (here, N) of slave channel units 20, 30,.

[0005] The common unit 40 includes an automatic gain adjustment circuit 1, an amplifier 2, a mixer 3, an amplifier 4, a distributor (hybrid) 5, and a D / A converter 8; Details are as follows.

The automatic gain adjustment circuit 1 is a means for adjusting the level of a received signal 50 received from the outside and automatically adjusting the output level to be constant, and includes a pin diode for level adjustment. The mixer 3 is a means for converting the frequency of the received signal 50. The distributor 5 converts the frequency-converted received signal 50 into one master channel unit 10 and N slave channel units 2 connected to the subsequent stage.
... means for distributing to 0, 30, .... D / A converter 8
Is a control voltage 5 for converting the AGC data 52 (digital signal) input from the master channel unit 10 into an analog signal and performing automatic gain adjustment of the automatic gain adjustment circuit 1.
9 is output. The amplifiers 2 and 4 are means for amplifying the level of an input signal and appropriately adjusting the level according to the input level of a circuit connected to the subsequent stage.

Next, the master channel section 10 includes an amplifier 11, an automatic gain adjustment circuit 12, a demodulator 13,
It is composed of a PU 14 and a D / A converter 15, and details of each circuit are as follows.

The amplifier 11 is means for amplifying and outputting the received signal input from the distributor 5. The automatic gain adjustment circuit 12 is means for adjusting the level of the signal input from the amplifier 11 and automatically adjusting the output level to be constant, and includes a pin diode for level adjustment. The demodulator 13 demodulates the signal input from the automatic gain adjustment circuit 12 and outputs the demodulated signal. The demodulator 13 compares the demodulated received signal with a preset reference voltage and calculates a difference 5
This is a means for outputting 1. The CPU 14 takes in the difference 51, encodes the difference 51 with a conversion table set in advance, and then performs automatic gain adjustment of the common unit 40 and AGC data 52 for performing automatic gain adjustment in the master channel unit 10. Output means. D / A
The converter 15 is a means for converting the AGC data 52 (digital signal) input from the CPU 14 into an analog signal and outputting a control voltage for performing automatic gain adjustment in the master channel unit 10.

Next, the slave channel unit 20 has the same configuration as the master channel unit 10 and
1, an automatic gain adjustment circuit 22, a demodulator 23, a CPU
24 and the D / A converter 25, the description of each circuit is omitted. As described above, the slave channel unit 30 has the same configuration as the slave channel unit 20, and includes an amplifier 31, an automatic gain adjustment circuit 32, a demodulator 33, a CPU 34, and a D / A converter 35. It is configured.

Here, a description will be given of a variable level adjusting method of the conventional radio communication device 40 described above. First, in the wireless communication device 60, when the common unit 40 receives the reception signal 50 including the multicarrier, the reception unit 50 performs automatic gain adjustment and frequency conversion of the reception signal 50, and then performs the master channel unit 10 and N transmission Are distributed to the slave channel units 20, 30,. Then, in the master channel unit 10, the received signal 50 is demodulated by the demodulator 13, the level of the demodulated received signal 50 is compared with a reference voltage preset in the demodulator 13, and the difference 51 is obtained. The input level of the received signal 50 is controlled by the automatic gain adjustment circuit 1 in the common unit 40 so as to fall within a predetermined range.

That is, when the CPU 14 takes in the difference 51, it outputs a coded data using a conversion table set in advance as AGC data 52, and the D / A converters 8 and 15 convert the AGC data 52 into the AGC data 52. The signal is converted into the control voltage of the level adjustment pin diode, and the automatic gain adjustment circuits 1 and 12 adjust the reception signal level by changing the attenuation of the pin diode.

[0012]

However, such a conventional example has the following problems. First, the first
When the difference between the reception level in the master channel section and the reception level in the slave channel section is large, the automatic gain adjustment range of the slave channel section may be exceeded and the error rate may be degraded.
This is due to the fact that the use of multi-carriers is progressing in satellite communication ultra-small earth stations (VSAT stations), and the reception level difference between channels tends to increase due to station-to-station deviation and the like. Further, in order to avoid this, it is necessary to widen the automatic gain adjustment range of the slave channel section, which causes a problem that the circuit scale becomes large.

As a second problem, when only the channel set in the master channel section cannot receive a carrier, not only the master channel section but also all the normally received slave channel sections can receive signals. In some cases, it will not be possible and the line will be disconnected. This is because the automatic gain adjustment of the common unit is performed only on the channel set in the master channel unit in the related art, so that the automatic gain adjustment of the common unit cannot be performed if the reception cannot be performed in the master channel unit. .

The present invention is intended to solve such a problem. Even when the difference between the reception level of the master channel unit and the reception level of the slave channel unit is large,
It is an object of the present invention to provide a multicarrier receiving method and a wireless communication device capable of reducing a dynamic range of an automatic gain adjustment circuit of a slave channel unit and simplifying a circuit configuration.

Another object of the present invention is to prevent the slave channel from being disconnected even if the carrier cannot be received by the master channel, thereby improving the reliability of the line. An object of the present invention is to provide a carrier receiving method and a wireless communication device.

[0016]

In order to achieve the above object, a multi-carrier receiving method according to the present invention comprises:
A common unit that automatically adjusts the gain of the input level of the received signal including the multicarrier and then converts the frequency and distributes the frequency-converted received signal for each carrier, and demodulates the distributed received signal to correspond to the master channel. A master channel unit for receiving a carrier to be transmitted, and a plurality of slave channel units for demodulating the distributed reception signal and receiving a carrier corresponding to a slave channel. By keeping the difference from the reference voltage within a predetermined range,
In a wireless communication apparatus that performs automatic gain adjustment in the master channel unit and the slave channel unit, in a state where no carrier is received in any of the master channel unit and the slave channel unit, the wireless communication device is determined by the master channel unit. The automatic gain adjustment of the common unit is performed by using the automatic gain adjustment amount, and in a state where either the master channel unit or the slave channel unit receives a carrier, of the master channel unit and the slave channel unit, The automatic gain adjustment of the common unit is performed using the average value of the automatic gain adjustment amounts obtained in all the channel units that have received the carrier.

The radio communication apparatus according to the present invention may further comprise a common unit for automatically gain-adjusting an input level of a received signal including a multicarrier, converting the frequency, and distributing the frequency-converted received signal for each carrier. A master channel unit for demodulating the distributed reception signal and receiving a carrier corresponding to the master channel, and a plurality of slave channels for demodulating the distributed reception signal and receiving a carrier corresponding to the slave channel A radio section for performing automatic gain adjustment in the common section, the master channel section and the slave channel section by maintaining a difference between the demodulated carrier level and a predetermined reference voltage within a predetermined range. In the communication device, the common unit may be any one of the master channel unit and the slave channel unit. Even in the state where no carrier is received, the automatic gain adjustment of the common unit is performed using the automatic gain adjustment amount obtained in the master channel unit, and any of the master channel unit or the slave channel unit is used. When the carrier receives the carrier, the automatic gain adjustment of the common unit is performed by using the average value of the automatic gain adjustment amounts obtained in all the channel units receiving the carrier among the master channel unit and the slave channel unit. Means for performing

With this configuration, the present invention provides:
By performing the automatic gain adjustment of the common unit in all the channel units receiving the carrier, even if the difference between the reception level of the master channel unit and the reception level of the slave channel unit is large, the automatic gain adjustment circuit of the slave channel unit The dynamic range can be reduced, and the circuit configuration can be simplified.

Further, even when only the master channel section cannot receive the carrier, the automatic gain adjustment of the common section can be continued in the other normally received slave channel sections. It is possible to avoid a disconnection of the section.

[0020]

Next, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention. In FIG.
In FIG. 2, the same reference numerals are given to the same or equivalent parts. Similarly to FIG. 2, the wireless communication device 60 includes a common unit 40, a master channel unit 10, and slave channel units 20, 3.
0,...

However, in the present embodiment, the automatic gain adjustment in the common
Not only the C data 52 but also the AGs obtained in all of the master channel units 10 and the slave channel units 20, 30,...
This is largely different from that of FIG. 2 in that the process is performed using the average of the C data (automatic gain adjustment amount).

Therefore, the configuration of the common unit 40 is greatly different from that of the conventional example of FIG. 2 in the following points. In addition to the configuration of FIG. , A sent from each channel unit
An AGC data averaging circuit 7 for averaging the GC data 52, 55, 58,... Based on the AGC data selection signal 57 is provided.

The configuration of the master channel section 10 is different from that of FIG. 2 in the following points. That is, CP
U14 not only outputs the AGC data 52, but also outputs a reception synchronization detection signal 53 indicating whether or not the reception of the master channel unit 10 is synchronized. Of course, the configuration of the slave channel units 20 and 30 is the same as that of the master channel unit 10, and similarly to the master channel unit 10, the CPUs 24 and 34 transmit not only the AGC data 55 and 58 but also the reception synchronization detection signal 56 and 2 is different from the configuration of FIG.

Here, the operation of the wireless communication device 60 according to FIG. 1 will be described. First, when no carrier is received at the time of initial startup or the like, the AGC of the only channel set in the master channel unit 10 is performed by the CPU 6.
An AGC data selection signal 57 is output so as to make the data 52 valid.

The AGC data selection signal 57
In the C data averaging circuit 7, the AGC data 52 from the master channel unit 10 is output as AGC data 58 with the same data. And this output AGC
The data 58 is converted into a control voltage 59 by the D / A converter 8 and controls the automatic gain adjustment circuit 1 of the common unit 40.

Thereafter, after the master channel unit 10 receives the carrier and synchronizes the reception, the master channel unit 1
Automatic gain adjustment of the automatic gain adjustment circuit 1 is performed by using 0 and all the slave channel units that are receiving. That is, the demodulators 13, 23, 33,... Of the master channel unit 10 and the N slave channel units 20, 30,.
Demodulates the received signal distributed by the common unit 40, compares the demodulated received signal with reference voltages set in the demodulators 13, 23, 33,.
... is output.

The output differences 51, 54, 57,...
Are captured by the CPUs 14, 24, 34,..., Respectively, and the CPUs encode the captured differences by using a conversion table, so that the AGC data 52, 55, 5
8, ... are output. At this time, each CPU receives a reception synchronization detection signal 53, 56, 5 indicating whether or not a carrier is being received.
9, ... are also output.

Then, the CPU 6 of the common unit 40 receives the reception synchronization detection signals 53, 56,
.., And outputs an AGC data selection signal 57 for validating the AGC data of all the reception-synchronized channel units.

Then, the AGC data averaging circuit 7 converts the AGC data 52, 55,
Among the 58,..., The average of only the AGC data of the channel section validated by the AGC data selection signal 57 is obtained and output as the AGC data 58. The AGC data 58 is converted into a control voltage 59 by the D / A converter 8,
By controlling the automatic gain adjustment circuit 1 of the common unit 40, the received signal level of the common unit 40 is kept constant.

The CPUs 14, 24,
The AGC data 52, 55, 58,... For performing automatic gain adjustment in each channel section output at 34,.
Are converted into control voltages by the A converters 15, 25, 35,..., And the automatic gain adjustment circuits 12, 22,.
.. Are finely controlled to keep the received signal level in the channel section constant.

As described above, the CPU 6 of the common unit 40 always receives the reception synchronization detection signal 53,
., And controls the AGC data averaging circuit 7 so as to invalidate the AGC data of the channel part which has become out of synchronization. When all the channels are out of synchronization, the CPU 6 sets the AGC data 5 of the only channel set in the master channel 10.
AGC data selection signal 57 is output so as to make 2 valid. Thereafter, when a carrier is received again, the operation is the same as described above.

[0032]

As described above, the present invention has the following effects. By performing the automatic gain adjustment of the common unit in the wireless communication device in all the channel units receiving the carrier, even if the difference between the reception level of the master channel unit and the reception level of the slave channel unit is large, on average Since automatic gain adjustment can be performed, the dynamic range of the automatic gain adjustment circuit of the slave channel unit itself can be reduced, and the circuit configuration can be simplified.

Further, even when only the master channel section cannot receive the carrier, the automatic gain adjustment of the common section can be continued by the other normally receiving slave channel sections. It is possible to prevent the channel section from being disconnected.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional example.

[Explanation of symbols]

1, 12, 22, 32 ... automatic gain adjustment circuit, 2, 4, 1
1, 21, 31 ... amplifier, 3 ... mixer, 5 ... distributor,
6, 14, 24, 34 ... CPU, 7 ... AGC data averaging circuit, 8, 15, 25, 35 ... D / A converter, 10 ...
Master channel section, 13, 23, 33 ... demodulator, 2
0, 30 ... Slave channel part, 40 ... Common part, 50 ...
Received signal, 51, 54, 57... Difference, 52, 55, 58
... AGC data, 53, 56, 59 ... reception synchronization detection signal, 60 ... wireless communication device.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04J 1/00 H04B 7/155

Claims (2)

(57) [Claims] 1. A common unit for automatically gain-adjusting an input level of a received signal including a multicarrier and then performing frequency conversion and distributing the frequency-converted received signal for each carrier.
A master channel unit for demodulating the distributed reception signal and receiving a carrier corresponding to a master channel; and a plurality of slave channel units for demodulating the distributed reception signal and receiving a carrier corresponding to a slave channel. Wireless communication for performing automatic gain adjustment in the common unit, the master channel unit, and the slave channel unit by maintaining a difference between the demodulated carrier level and a predetermined reference voltage within a predetermined range. In the apparatus, in a state where neither the master channel unit nor the slave channel unit receives a carrier,
The automatic gain adjustment of the common unit is performed by using the automatic gain adjustment amount obtained by the master channel unit. In a state where either the master channel unit or the slave channel unit receives a carrier, the master channel unit And performing an automatic gain adjustment of the common unit using an average value of the automatic gain adjustment amounts obtained in all of the slave channel units that have received a carrier. 2. A common unit for automatically gain-adjusting an input level of a received signal including a multicarrier and then performing frequency conversion and distributing the frequency-converted received signal for each carrier.
A master channel unit for demodulating the distributed reception signal and receiving a carrier corresponding to a master channel; and a plurality of slave channel units for demodulating the distributed reception signal and receiving a carrier corresponding to a slave channel. Wireless communication for performing automatic gain adjustment in the common unit, the master channel unit, and the slave channel unit by maintaining a difference between the demodulated carrier level and a predetermined reference voltage within a predetermined range. In the apparatus, the common unit uses an automatic gain adjustment amount obtained in the master channel unit in a state where a carrier is not received in any of the master channel unit and the slave channel unit. Perform the adjustment, and perform the master channel section or the slave channel In a state where any one of the channel units receives a carrier, the common unit automatically uses the average value of the automatic gain adjustment amounts obtained in all of the master channel unit and the slave channel unit that have received the carrier. A wireless communication device comprising means for performing gain adjustment.