JPH0514236A - Radio repeating installation - Google Patents

Abstract

PURPOSE:To provide a radio repeating installation by which a satisfactory communication can be repeated by a sufficient transmitted output without troubling to select a topography, and the usage of a frequency can be reduced to the minimum. CONSTITUTION:The radio repeating installation is equipped with two repeaters CK1 and CK2 which are respectively equipped with a transmitting part and a receiving part which use the radio wave of the same frequency, and which operate transmitting and receiving operations by the radio wave of the frequency different from each other, and a communication control part CKC which communicates and controls those two repeaters CK1 and CK2. Then, each receiving part CR1 and CR2 temporarily time-compresses a sound signal from mobile stations MK and M'K, or a base station being the other destination of the communication, so as to be less than 1/2, converts it into an intermittent compressed sound signal, and receives a transmitted intermittent radio wave by using it as a modulated signal. Then, the communication control CKC transmits the received content to the transmitting parts CT1 and CT2 of the other repeater, and each transmitting part CT1 and CT2 transmits the transmitted received content on the intermittent radio wave.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless relay device used for relaying wireless communication between mobile stations located in a position where radio waves cannot reach or between a mobile station and a base station.

[0002]

2. Description of the Related Art There are the following devices which are currently in practical use or have been proposed as wireless relay devices for wireless communication using radio waves of a single frequency. That is, the receiving unit and the transmitting unit of the wireless relay device are spatially completely separated, and the device is configured so that both parts do not interfere with each other (interference between transmission and reception) in the radio wave of the single frequency used. The receiver and the transmitter are simultaneously operated, and the receiver and the transmitter of the wireless relay device are completely separated in time to alternately perform transmission and reception. Next, this will be described in the case of wireless relay of the base station F → ← relay station C → ← mobile station M.

FIG. 2 shows a wireless relay device and its wireless communication method in the case of. In this case, the wireless communication is "base station F →
Communication in the direction of relay station C → mobile station M and communication in the direction of “mobile station M → relay station C → base station F” are switched alternately (therefore, this device is also called a seesaw repeater), and the relay station The wireless relay device of C is an ideal obstacle (hereinafter simply referred to as a mountain) MO that does not interfere with each other.
Two wireless repeaters C of the same type installed across the UNT
It is composed mainly of a and Cb. In the following, the constituent parts of the wireless repeaters will be distinguished by the suffixes a and b, and the wireless repeaters Ca and Cb, the transmitters Ta and Tb, and the receiver R will be described.
a, Rb, antenna couplers ATa, ATb, antenna Aa,
It consists of Ab. The receiving unit Rb (Ra) on one side and the transmitting unit Ta (Tb) on the other side are always connected by a connecting unit IF (generally connected by an intermediate frequency portion).

To describe the wireless relay method, for example, when a radio wave of frequency f (single frequency) emitted from the base station F is received by the receiving unit Ra, the signal passes through the communication unit IF and the transmitting unit. The signal is transmitted from Tb to the mobile station M, that is, relayed (the above route is indicated by a chain line). In addition, from the mobile station M to the base station F, the reverse route (indicated by a thin line) R
Relay is performed from b → IF → Ta. (Rb → Ta, Ra →
When one of Tb is active, the other is dormant).

In the case of the wireless communication method in which the receiving unit and the transmitting unit of the wireless relay device are temporally separated and the two are alternately operated, as shown in FIG. 14, the wireless relay device C causes the transmitting unit Ta to operate. , A reception unit Ra, a transmission / reception switching control unit CONT, and a voice delay unit (temporary storage unit) D. The voice received and demodulated by the reception unit Ra during the receiving operation is once stored in the voice delay unit D and then transmitted. The operation of transmitting by the transmission unit Ta at the time of operation is switched at high speed by a time division method for communication.

The above is the relay in the case of using the radio wave of a single frequency, but at the present time, in the case of a simultaneous call, the base station F uses four different frequencies fa, fb, fc and fd. → ← Relay station C transmits / receives at frequencies fa · fb, and relay station C → ← mobile station M transmits / receives at frequencies fc · fd.

[0007]

This wireless relay method has the following problems. That is, in order to prevent the device from oscillating due to the mutual interference between the radio repeaters Ca and Cb, an ideal mountain MOUNT between which a large attenuation of radio waves can be obtained.
Is required, and it is difficult to select the topography. In some cases it cannot be installed. Further, in order to prevent mutual interference between the radio repeaters Ca and Cb, even if there is a mountain MOUNT, in most cases, the transmission output of Ta and Tb should be reduced. Therefore, this method can only be used for relief of small dead zones and is not universally effective.

The wireless relay method (1) has the following drawbacks. That is, when switching between transmission and reception is performed at high speed, the occupied bandwidth of the radio wave is widened and it cannot be applied in the current wireless service. If the switching speed is reduced to such an extent that it can be applied, half of the voice information is lost due to the intermittent operation, and high-quality relay cannot be performed. Various methods have been devised to improve the missing voice information by compensating it at the base station or mobile station, but there are limits to the improvement, and moreover,
There are also problems such as having to modify existing equipment.

According to the wireless relay method of (1), all the above problems in the wireless relay method of (3) are completely eliminated, and clear simultaneous voice transmission / reception becomes possible. However, this wastes valuable radio waves, and this method fails this method.

The present invention solves the above-mentioned drawbacks, makes it possible to relay high-quality communication with sufficient transmission output without difficulty in selecting the topography to be installed, and to minimize the use of frequency. The purpose is to provide a relay device.

[0011]

In order to solve the above problems, the present invention is a repeater having a transmitting section and a receiving section that use radio waves of the same frequency, but transmitting and receiving with radio waves of different frequencies. Two repeaters and a communication control unit that communicates and controls the two repeaters, and the receiving unit of each repeater once receives a voice signal from a mobile station or a base station that is a communication partner. / 2 or less is time-compressed and converted into an intermittent compressed audio signal, which is then used as a modulation signal to receive the intermittent radio wave, and the communication control unit receives the received content and the other relay device The wireless relay device is configured in such a manner that the transmitted content is transmitted to the transmitting section of the wireless communication apparatus, and the transmitted content is transmitted on intermittent radio waves.

As the "reception contents" sent by the contact control unit, several things can be adopted. First, each of the reception units sends an intermittent radio wave transmitted from a mobile station or a base station with which it communicates. The intermittent compressed voice signal received and detected is time-expanded and demodulated into a continuous voice signal, and the communication control unit uses the demodulated voice signal as "reception content" for the other repeater. To the transmitting section, and the transmitting section, which has been sent, temporarily compresses the received voice signal to 1/2 or less, converts it into a compressed voice signal which is intermittent, and then uses it as a modulation signal to intermittently transmit. There is a wireless relay device that is configured to send out radio waves.

Next, each receiving section receives the intermittent radio waves sent from the mobile station or the base station, which is a communication partner, and detects and detects the intermittent compressed voice signals as "received contents" as they are. Inform the contact control unit, and the contact control unit
Send it to the transmitter of the other repeater, and the transmitter will
There is a wireless relay device configured to send intermittent electric waves by using this as a modulated signal. The relay speed will be faster than the former.

Further, each receiving unit receives the intermittent radio wave transmitted from the mobile station or the base station with which it communicates, converts it into an intermediate frequency, and the communication control unit converts this intermediate frequency. There is a wireless relay device having a configuration in which "reception content" is sent to the transmission unit of the other relay, and the transmission unit converts the transmitted intermediate frequency into intermittent radio waves and transmits the radio waves. The relay speed will be even faster.

In the wireless communication method performed by the wireless relay device having the above-mentioned structure, there occurs a case where the occupied bandwidth of the frequency of the radio wave is widened due to the voice compression, which causes a problem. In order to prevent the spread of the frequency band of the radio wave, the high frequency component of the voice is cut off, then this is converted into an intermittent compressed voice signal, and this is used as a modulated signal to transmit the radio wave, which is solved by a wireless relay device. .

[0016]

1 is a block diagram of an embodiment of a wireless relay device according to the present invention. There are a wireless communication area MM composed of a large number of mobile stations and base stations (represented by MK) and a wireless communication area MM 'composed of a large number of mobile stations and base stations (represented by M'K). It is assumed that communication between the two areas is impossible because they are separated by the mountain MOUNT and relay is required. Wireless relay device CK provided on the mountain MOUNT
Is equipped with two relays CK1 (including a transmitter CT1 and a receiver CR1), CK2 (including a transmitter CT2 and a receiver CR2) and a contact controller CKC, and the relay CK1 has a frequency fc1.
, And the relay station CK2 transmits and receives to and from the mobile station MK 'in the wireless communication area MM' using the radio wave of the frequency fc2. The signal (for example, a voice signal) obtained by the reception is transmitted to the transmission unit of the other relay by the communication control unit CKC, and is transmitted on a radio wave having a frequency different from the one before.

In the wireless relay device according to the present invention, when the repeater (the transmitting unit and the receiving unit thereof) transmits / receives voice to / from a mobile station or a base station of a partner station within the same wireless communication area, "conventional simultaneous transmission / reception wireless communication" is performed. The apparatus is configured to use the "new communication method using voice compression / decompression proposed in communication" to solve all of the above problems at once. In practicing the present invention, it is desirable that the same communication method be used not only between the repeater and the mobile station or the base station, but also between the mobile stations or between the mobile station and the base station. When this communication method is adopted, in addition to the function improvement of the relay according to the present invention, simultaneous transmission / reception is possible, so that the usefulness of communication is enhanced at once.

"Communication method using voice compression / decompression, which has been proposed in the conventional simultaneous transmission / reception wireless communication".
Is summarized as follows. That is, the master station (wireless station on the driving side) and the slave station (counter station) each have a transmitter / receiver of the same function, and the transmitter of the master station time-divisions the audio signal and obtains it by time-division. Each divided audio signal is time-compressed and converted into an intermittent signal, the carrier is modulated by the intermittent signal and converted to an intermittent radio wave, and transmitted to the slave station.The receiver of the slave station is sent from the master station. By applying time expansion to each of the intermittent signals obtained by receiving and detecting the intermittent radio waves, and connecting the divided audio signals obtained by time expansion in synchronization with the time division of the master station, the original It is a simultaneous transmission / reception wireless communication method of returning to an audio signal.

When the apparatus is configured to use this method, it means that the repeater (the transmitting section and the receiving section) of the above-mentioned wireless relay apparatus performs voice communication with a mobile station or a base station of a partner station within the same wireless communication area. The transmission / reception operation of is performed in the same manner as the transmission / reception operation performed in this "simultaneous transmission / reception wireless communication".
Is to say.

In the following, for the purpose of clarifying the method performed by the device of the present invention and the devices used for it, the method, device, the occupied frequency bandwidth compression of radio waves, and the timing of "simultaneous transmission / reception wireless communication". The signal transmission will be described in detail with an example. However, in the following description of “simultaneous transmission / reception wireless communication”, in order to avoid confusion, the names of the relay station, the base station, and the mobile station will not be used, but the names of the master station and the slave station will be described.

In FIG. 3, the two narrow band voice wireless communication devices B1 and B2 are devices having the same structure, and both use a single frequency f for transmission and reception. Then, a transmitter T and a receiver R (in the drawing, the reference numerals of the respective members indicate the wireless communication device B1
, B2 with lower case subscripts 1 and 2. The same shall apply hereinafter), a control switch SW that switches and operates them at a fixed cycle, a synchronization generator SYCGEN that regulates the cycle and synchronizes with each other, and a speaker S.
It incorporates a P, a microphone MIC, and an antenna coupler AT. ANT is an antenna. Sync generator SYCG
Due to the function of EN, the transmission / reception operations of both wireless communication devices are periodically controlled so as to be opposite in time. Then, on the transmitting side, the modulated signal is time-divided and the communication time is compressed to modulate the carrier to send out intermittent radio waves, and on the receiving side, the signals obtained by receiving and detecting the radio waves are time-expanded. , And simultaneous transmission / reception wireless communication is performed in which the original signals are demodulated by connecting them in synchronism with time division on the transmitting side. As for the synchronization method, one wireless communication device of the communication becomes the "master station", that is, the driving side, and decides the time division of the time division of the modulated signal at the time of transmission, and the other wireless communication device of the communication is " It becomes a "slave station", that is, a passive side so as to synchronize with this.

FIG. 4 shows two narrow band voice wireless communication devices B1.
3 is a time chart of a communication between B2 and B2.
VM is a transmission voice signal, SWT is a control switch S
Switching status of transmission and reception by W, VSP is a reception voice signal. The operation of the SWT is only half of the intermittent period T0 of the audio signal. The transmission / reception audio signal from the wireless communication device B1 to the wireless communication device B2 is shown by a solid line, and the transmission / reception audio signal from B2 to B1 is shown by a dotted line.

In the communication shown in FIG. 4, on the transmitting side, the transmission voice signal VM input from the microphone MIC is subjected to "time division" () processing at equal time intervals (in parentheses is the case of dotted lines, the same applies hereinafter), And 1/2 "time compression" () processing is added, and it becomes an intermittent signal of compressed voice, which modulates the carrier and is transmitted as an intermittent radio wave, while the receiving side receives and detects such radio wave. The intermittent signal () of the compressed voice obtained as described above is subjected to "time expansion" of twice, and is combined and demodulated into the signal of (), that is, a continuous voice signal, and output to the speaker SP. By this operation, continuous and high-quality sound is delivered to the recipient's ear.

The above simultaneous transmission / reception wireless communication device has the following problems. One is that when a limit value is set for the occupied frequency bandwidth of the transmitted radio wave, the occupied bandwidth of the transmitted radio wave becomes wider due to the compression of the voice, and the limit value is exceeded and interference is given to others. It's a problem. Another issue is the issue of synchronization. When decompressing each divided voice on the receiving side and connecting them, if there is a gap in the divided voices that are not synchronized and the connected divided voices are generated, intense noise such as plosive noise is mixed in and the call becomes almost impossible. Sometimes. It must always be in sync. This synchronization must not be weak enough that fading easily causes out-of-sync.

A further problem is that parent stations are generated in a large number of stations and talk with each other at one of the above-mentioned frequencies (usually). It must be devised so that the child station (station to talk to) can be selected. Failure to do so will result in confusion as a call between one master station and multiple slave stations. Another problem is the problem of time delay that occurs during this audio processing, that is, the "time division", "time compression", "time expansion" and "concatenation" processing. This time delay makes the call frustrating as if it were being made over a satellite line. Described below is a simultaneous transmission / reception wireless communication method and apparatus that solves the problem.

The following problems occur in the processing of these voices, that is, the processing such as "time division", "time compression", and "time expansion". That is, since the audio signal is compressed in half the time, its maximum modulation frequency (here assumed to be 3 kHz) doubles and the frequency bandwidth widens. That is, the limit value is exceeded and it becomes unusable. This phenomenon becomes more severe when the compression (expansion) rate is 2 or more. To solve this problem, the upper limit of the modulation frequency is halved by using a low-pass filter LPFQ (hereinafter referred to as a band limiting filter), and the effective maximum modulation frequency is limited (for example, limited to 1.5 kHz). The structure is shown in FIG. In FIG. 5, the band limitation filter LPFQ is placed on the voice VM after the microphone MIC to obtain the voice VMQ with the maximum frequency limited. For voice,
It is known that even if the filter cuts the frequency part of 1/2 or more of the modulation frequency, there is almost no hindrance to the call.

The voice VMQ has its pass band limited to ˜3 kHz by the aliasing noise elimination low-pass filter AALPF (not a voice band limit, but one provided so as not to allow sampling noise to enter the voice).
It is converted into a digital value by the D converter ADC and stored at a predetermined address of the random access memory RAM at a normal speed (for example, 8 kHz). After this process is performed for a certain period of time, this time the speed (1
This is read at 6 kHz, and it is immediately converted into an analog value by the D / A converter DAC. Starting from the time when the above storage is completed, the same storage and read as described above are performed using another predetermined address of the random access memory RAM, and both processes are repeated to perform VSS through the band limiting filter BLLPF. Will be output. A voice pitch controller CTR containing a microcomputer controls the above operation. Therefore, this CTR serves as both SW and SYCGEN in FIG. That is, the start signals are sent to the two converters ADC and DAC, and the random access memory R
For AM, work to specify each of the above predetermined addresses,
Performs storage / reading work at varying speeds.

The transmission / reception switching frequency F0 is 1 Hz to 1
A value that does not hinder operation at 0 Hz is adopted. It has been found that placing this F0 within the range of 1 Hz to 10 Hz in the simultaneous transmission / reception wireless communication device is an essential condition when obtaining a voice having both intelligibility and confidentiality.
Regardless of whether various measures described below are applied, if the frequency is out of this range, the intelligibility does not change significantly.
The sense of confidentiality decreases in a human sense. Generally speaking, since the voice consists of several syllables per second, the voice is 1 Hz to 1 Hz.
When 1/2 time compression is performed at a frequency of about 0 Hz, the blank time generated by the compression process and the time equivalent to the syllable become approximately the same, and the illusion that the syllable is dropped occurs, making it difficult to grasp the conversation. . Moreover, since the voice pitch (frequency) is doubled by 1/2 time compression, it is difficult to hear and the effect is further enhanced. Therefore, in the configuration of the communication device described above, the transmission / reception switching frequency F0 is set in the range of approximately 1 Hz to 10 Hz, and in the radio wave carrying the compressed half cycle time of transmission, even if the third party intercepts this, the conversation It is almost impossible to hear the contents.

In order to help understanding, a secret story is visually expressed and explained with reference to a, b, c and d in FIG. 6, a is a continuous syllable, and b is a frequency much lower than 1 Hz. It is time-compressed at (cycle longer than 1 second). Since several syllables are connected, it is difficult to understand the content of the conversation and obtain confidentiality. c is repeated by setting the frequency of time compression to about 1 Hz to 10 Hz, and the syllables are separated from each other, resulting in a voice like a missing tooth, making it difficult to understand the content of the conversation and securing confidentiality. It d is a repetition of the time compression frequency set to a frequency considerably higher than 10 Hz. Although the syllables are finely divided, they are continuous with almost no time separation, so that the content of the conversation can be understood with high probability. be able to. 6a,
Although b, c, and d are visually explained, it was confirmed experimentally that this is also auditory.

There is always the problem of fading in mobile communications. This method greatly contributes to this improvement. Generally, in mobile communication, radio waves are reflected by a building or the like, so in most cases, direct waves that directly reach the other party and radio waves that include standing waves in which reflected waves interfere with each other are used for communication. Interference occurs approximately every 1/2 of the wavelength of the radio wave, and the electric field strength of the composite wave sometimes fluctuates considerably. When the electric field strength falls below the limit of the receiver's capability, noise occurs and a fading phenomenon occurs. . The frequency Ff (Hz) of fading noise generated in the receiver of the mobile station with the moving speed v (m / sec) is half the wavelength (that is, λ / 2, λ is the wavelength) while the station runs for 1 second. The unit is determined by passing m) and is given by Ff = v / (λ / 2). For example, when the frequency f of the radio wave is 800 MHz and the moving speed is 20 km / h, Ff is approximately 30 Hz. The frequency Ff of fading noise increases in direct proportion to both the frequency of the radio wave and the moving speed. As a matter of course, the larger Ff, the more disturbing the call becomes and the more uncomfortable. 7 a, b,
c and d are diagrams for explaining the content of fading noise, where the horizontal axis represents time, a represents changes in electric field strength, a dashed-dotted line represents a reception limit level, b represents switching between reception and transmission, and c represents fading appearing in a reception detection signal. Noise, d is noise appearing in a demodulated signal obtained by expanding and connecting the noise. It can be seen that in the demodulated signal, the noise generation interval is widened, the frequency is reduced, and the improvement is automatically made. Due to this effect, the expansion of the service area is achieved.

As is apparent from FIG. 7, transmission / reception to Ff
There is an appropriate value for how to change the reception switching frequency F0, and in practice, it was found that setting F0 to a value smaller than Ff when v = 20 km / h is an excellent measure against noise. When this condition is expressed by a mathematical formula, Ff is proportional to the frequency of the radio wave, so when the frequency is fMHz, Ff
0 <30 · f / 800.

Next, a method of establishing synchronization and the like will be described. Here, the improved simultaneous transmission / reception wireless communication method shown in the timing chart of FIG. 9 is adopted by using a new device shown in FIG. 8 in which only the parts necessary for the immediate explanation of the master / slave station are extracted. Each of the parent and child stations has an internal device having an equivalent function, and the configuration of the device is as shown in the block diagram and FIG. In FIG. 10, a controller CTR with a built-in microprocessor for orderly operation of all signal processings to be described below,
The antenna coupler AT and the like are in the form added to FIG. By way of example, the subscripts 1 and 2 that distinguish between the parent and child of the device are omitted.

Now, the order of simultaneous transmission / reception will be described with reference to FIGS. 9 and 8. First, the transmitter of the master station synchronizes with the synchronization generator TDG1 for producing the synchronization tone signal TWQ and the microphone M.
The voice VW1 obtained by the IC1 is passed through a band limiting filter LPFQ, and the intermittent compressed voice V is output from the voice VMQ1 in which the high frequency band is limited.
A voice processing unit TOS1 for making SS1 and an adder MU1 for adding the signals sent from both and sending it to the modulating unit MODQ1 are newly provided, while the receiving unit of the slave station is the antenna A of the master station.
The antenna ANT2 receives the radio waves sent from NT1,
Of the signals detected by the detection unit DEMOD2, a synchronization processing unit RDS2 that processes the synchronization tone signal TWQ, an audio processing unit ROS2 that processes the audio signal VSS2, and a switch that switches these signals to both and outputs them in good timing. It has a new circuit SWQ.

With these devices, in the master station, the voice processing unit TOS1 divides the original transmission voice VMQ1 in the column of the timing chart of FIG. 9 into TQ3 (for example, 395 msec) intervals, and each of them is divided by 1 / 2.5. Are compressed into the intermittent compressed audio signal VSS1. Then, the synchronization generator T
The synchronizing tone signal TWQ sent from DG1 is combined with the adder MU1 to form a modulated signal in the column, which is sent to the transmitting high frequency section TQ1 via the modulating section MODQ1 and is sent from the antenna ANT1 as an intermittent radio wave. To be done. The transmission section TSQ1 of the transmission unit of the master station (T in the column
Q2, for example 210 msec) and the receiving section RSQ of the receiving unit
The total of 1 (TQ1 in the column, for example, 185 msec) is the above-mentioned division section (TQ3, 395 msec), and since synchronization between the parent and child stations is established as described below, each of them is received by the child station. It is a section (TQ2 in the column) and a transmission section (TQ1 in the column). Sync tone signal period Ta (for example, 25 m
sec) and the reception section TQ1 between the time interval Tb (5 ms
ec) is usually placed.

In the slave station, when the above-mentioned radio wave is received and detected by the detection unit DEMOD2 after passing through the reception high frequency unit RQ2, the signal of TWQ + VSS1 in the previous column is taken out, and first, the synchronization tone signal TWQ is switched by switching the switch SWQ.
Is sent to the synchronization processing unit RDS2, a timing point CUQ2 used to match the phase of the time division pattern of the slave station with that of the master station is extracted, and a synchronization signal generated by the own station is synchronized with it. Let Along with that, a control signal is also sent to the voice processing unit ROS2,
Each divided section of the intermittent compressed audio signal VSS1 is expanded by a factor of 2.5, and they are connected to each other to produce the audio signal VS2 in the column.
And the pseudo high frequency band component VHQ is added to produce a voice VSX2 that is close to nature and is output to the speaker SP2. Although detailed illustration is omitted, in response to the above, the voice signal input from the microphone of the slave station is also divided like the master station and compressed to 1 / 2.5 to become the intermittent compressed voice signal VSS2 in the column. , (Generally, the compression rate of the slave station → the master station and hence the expansion rate do not necessarily have to match those of the master station → slave station. That is, the time TS1 in the column of FIG. 9 and the time TS2 in the column should be equal. Is not an indispensable condition. The switching operation required when the two are different is the controller CT.
R will discriminate between the parent and the child) and will be sent to the transmission section TSQ2 of the child station in the column riding on the radio wave of the child station, and the parent station will receive it in the reception section, that is, RSQ1 of the column. , (10), the audio signal VS1 is demodulated (detected, expanded, and connected) and output to the speaker. In this case, the tone signal such as the above-mentioned TWQ is not included in the radio wave transmitted by the slave station because it is unnecessary. Therefore, when the device of FIG. 10 is used as a slave station, the synchronization generation unit TDG does not generate a synchronization tone signal. This operation switching is also
The controller CTR discriminates between the parent and the child.

Although it has been popular to send tone signals for synchronization, conventional tone signals for synchronization are usually generated by a digital circuit as shown in FIG. Is a single sine wave DT1 such as b in the same figure, which is created based on a rectangular wave like a in
Therefore, the extraction of the timing point was accompanied by the instability of the rabbit angle. The reason is that this sine wave signal D
When T1 is demodulated at the receiving side, since the signal passes through a filter and various other demodulation circuits, the obtained signal is inevitably a transient "who" at the beginning and end, as shown by c in the figure. It is accompanied by 13Q and 14Q.
Since this "who" exists, it becomes a difficult problem as to which position of this c should be selected and included in this c so that the receiving side can extract it without error. . In the case of the simultaneous transmission / reception wireless communication device, strict synchronization is required especially, and it has been found by experiments that selection / extraction thereof is a difficult technique.

In order to solve this problem, as shown in FIG. 12, a joint position (generally a predetermined joint position) cc of two (generally a plurality of) tone signals DT1 and DT2 having different continuous frequencies. Or, ideally, a position deviated from that by a predetermined value (a phase angle of 720 degrees in the case of c in the figure) is selected as the timing point CUQ2. According to this method, at least the joint c
Since there is no amplitude "droop" as seen in 13Q and 14Q at the c position, the timing point CUQ2 can be extracted extremely accurately on the receiving side. The timing point CUQ2 in the column of FIG. 9 is selected, contained and extracted in this way. In FIG. 9, the division point of the division of the transmission voice of the master station in the column does not match the rising or falling position of the transmission section TSQ1. The controller CT shown in FIG. 10 regulates the time interval between the two.
R. In addition, the time positions of the sync tone signal TWQ and the intermittent compressed audio signal VSS1 in the column and their mutual intervals, etc. are regulated with respect to the dividing points described above, and the transmission / reception of radio waves of the parent / slave station is controlled. It is also the controller CTR.

Furthermore, the controller CTR also performs an operation of adjusting the synchronization signal of the own station to the master station by using the timing point CUQ2 extracted by the slave station. Dotted lines extending from the controller CTR indicate various information and control signals exchanged for the control. It should be noted that it is obvious that the above can be conveniently applied to both analog and digital simultaneous transmission / reception wireless communication devices, and no explanation is required.

Since considerable portions have already been shown in FIGS. 5 and 9, the following new technique disclosed herein will be described with reference to FIGS. 13 and 14. For the simultaneous transmission / reception wireless communication without delay in the call, that is, without the mellowness, the measures described below are indispensable. Each section of the divided audio VMQ1 in the column of FIG. 9 is controlled by the controller CTR as shown in FIG.
Random access memory RAM after digitized by C
Is input to and stored in, but most of the input is TQ2.
From the time when it was performed between / TQ3 (generally more than half),
At the speed of TQ3 / TQ1 times at the time of input, D / A converter DA
The stored contents are read toward C, and the reading ends immediately after the end of the division section. The one thus obtained is the intermittent compressed audio signal VSS1 in the column.

As shown in FIG. 13, the intermittent compressed audio signal VSS detected and extracted by the slave station which has received the radio wave from the master station is AALPF, A as shown in FIG.
Random access memory R via A / D converter ADC
It is input to AM and stored, but immediately after the start of the input, toward the D / A converter DAC, TQ1 / TQ3
The reading starts at the speed of, and the reading ends immediately before the start of reading the next section of the intermittent compressed audio signal VSS. In this way, VS, that is, the demodulated signal VS2 in the column is obtained.

In FIG. 9, the sound of the section arrives at the section only with a delay of about 0.5 sections. The method of improving the delay in signal transmission disclosed herein can be used not only when the modulation is an analog signal such as voice, but also when it is a digital signal. It can be used even when the above device has a limitation on the occupied frequency bandwidth of the transmitted radio wave,
It is possible to obtain a simultaneous transmission / reception wireless communication device with extremely high intelligibility and intelligibility of voice, with no messy delay in communication.

Although the method and apparatus for "simultaneous transmission / reception wireless communication" have been described in detail above, the apparatus for simultaneous transmission / reception wireless communication can be used as it is for the wireless relay device of the present invention, and can be utilized very effectively. A (common) timing signal is added to synchronize repetitive operations, and the high-frequency component of the voice is cut off and converted to an intermittent compressed voice signal to prevent the spread of the frequency band of the transmitted radio wave, and then it is converted to a modulation signal. Both of which are used to transmit intermittent radio waves, and they are directly used in the device of the present invention.

However, in the case of the present invention, since the device is a wireless relay device, the above operation of the master station and the slave station (in the
The relay operation by the contact control unit CKC is added. That is, as shown in FIG. 1, the voice transmitted from the mobile station MK in one wireless communication area (for example) MM by the intermittent electric wave (T) of the frequency fc1 is transmitted to the relay CK1.
After being received and demodulated by the receiving unit CR1 of the communication unit, the communication control unit CKC passes the signal to the transmitting unit CT2 of the other relay CK2, where it is subjected to processing such as compression and used for modulation, and the frequency fc2 is intermittent. Wireless communication area M on radio waves (T)
It is sent to M'mobile station M'K. Although the relay operation is added, the function of "simultaneous transmission / reception wireless communication" is preserved before and after the relay, which is extremely effective.
When selective calling is performed in the permutation or combination using the "plurality of tone signals" described above, the range of the selective calling becomes a wide range over both the relayed MM and MM 'regions.

Now, the above is one repeater (for example) CK
The reception unit CR1 of 1 receives the radio wave and demodulates the voice, and the communication control unit CKC transmits it to the transmission unit CT2 of the other repeater CK2, and the transmission unit CT2 converts this into a compressed voice signal and further turns it into an intermittent radio wave. It was to change and transmit, but this not only complicates the device, but also causes delay in relaying,
If you give me a big bow, you may have a problem that the conversation is uncomfortable.

This problem is solved by the following method. That is, the receiver CR1 of one repeater (for example) CK1
Receives the radio wave of frequency fc1, detects it, and converts it into a compressed audio signal that is intermittent, the communication control unit CKC immediately (without demodulating) transmits it to the transmission unit CT2 of the other relay CK2, and transmits it. The section CT2 then modulates the carrier wave (the operation for producing the compressed audio signal is unnecessary), and the frequency f
It transmits c2 intermittent radio waves. The device is simplified and the speed of relaying is quick.

The simplification and the improvement of the relay speed described above will be further advanced by the following procedure. That is, one repeater (for example) CK
When the receiving unit CR1 of 1 receives the radio wave of the frequency fc1 and converts it into the intermediate frequency, the communication control unit CKC immediately transmits the intermediate frequency to the transmitting unit CT2 of the other relay CK2, and the transmitting unit CT2 immediately transmits it. It is transmitted by changing to intermittent radio waves of frequency fc2. The device is extremely simplified,
The speed of the relay will be even faster.

[0047]

According to the device of the present invention, all the above-mentioned conventional problems can be solved. That is, it is possible to provide a wireless relay device that does not have a difficulty in selecting the topography to be installed, can relay high-quality communication with sufficient transmission output, and can obtain clear simultaneous conversation. It does not cause interference problems. The efficiency of spectrum utilization will be improved, which will make an immeasurable contribution to the wireless communication industry.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a wireless relay device of the present invention.

FIG. 2 is a block diagram of a conventional wireless relay device.

FIG. 3 is a block diagram showing a configuration of a simultaneous transmission / reception wireless communication device.

FIG. 4 is a time chart of the communication.

FIG. 5 is a block diagram of a voice processing unit on the transmitting side.

FIG. 6 is a diagram for visually explaining and explaining a secret story in order to help understanding.

FIG. 7 is a diagram illustrating the content of fading noise.

FIG. 8 is a diagram extracting and showing only a part necessary for explaining the simultaneous transmission / reception wireless communication of the master / slave station.

FIG. 9 is a timing chart of a simultaneous transmission / reception wireless communication method.

FIG. 10 is a block diagram of a configuration of a parent / slave station device.

FIG. 11 is a diagram of a tone signal.

FIG. 12 is a diagram of an improved tone signal.

FIG. 13 is a block diagram of a voice processing unit on the receiving side.

FIG. 14 is a block diagram of another example of a conventional wireless communication system.

[Explanation of symbols]

MK, M'K Many mobile stations and base stations MM, MM 'wireless communication area MOUNT mountain CK wireless relay device CK1, CK2 repeater CT1, CT2 transmitter CR1, CR2 receiver CKC communication control unit fc2, fc1 Radio frequency

Claims (5)

[Claims] 1. Each of the relays comprises a transmitter and a receiver that use radio waves of the same frequency, and two relays for transmitting and receiving radio waves of different frequencies are connected to each other. A wireless relay device including a communication control unit that controls each of the reception units, and each reception unit temporarily compresses a voice signal from a mobile station or a base station, which is a communication partner, to 1/2 or less, and intermittently compresses the voice signal. After converting to a compressed voice signal, it is used as a modulation signal to receive an intermittent radio wave that is transmitted, and the communication control unit sends the received content to the transmission unit of the other relay, and each transmission unit A wireless relay device characterized in that the received contents sent are sent on intermittent radio waves. 2. Each of the receiving sections receives the intermittent radio waves sent from a mobile station or a base station as a communication partner, detects the intermittent radio waves, performs time expansion on the intermittent compressed audio signals, and outputs them. To a continuous voice signal, the communication control unit sends the demodulated voice signal to the transmission unit of the other repeater, and each of the transmission units temporarily outputs the received voice signal. 2. The wireless relay apparatus according to claim 1, wherein the wireless repeater is time-compressed to ½ or less, converted into an intermittent compressed audio signal, and then used as a modulation signal to transmit an intermittent electric wave. 3. Each of the receiving units transmits an intermittent compressed voice signal obtained by receiving and detecting the intermittent radio wave transmitted from a mobile station or a base station, which is a communication partner, to the communication control unit. The wireless relay device according to claim 1, wherein the communication control unit sends it to the transmission unit of the other repeater, and each of the transmission units uses this as a modulated signal to send intermittent radio waves. 4. Each of the reception units receives the intermittent radio waves transmitted from a mobile station or a base station that is a communication partner, converts the radio waves into an intermediate frequency, and the communication control unit determines the intermediate frequency. 2. The wireless relay apparatus according to claim 1, wherein the wireless relay device is configured to transmit the intermediate frequency to the transmitting unit of the other relay, and each of the transmitting units converts the transmitted intermediate frequency into an intermittent electric wave and transmits the electric wave. 5. Each of the transmitters cuts off a high-frequency component of a voice and then converts the compressed high-frequency component into an intermittent compressed voice signal in order to prevent the spread of the frequency band of the radio wave, and uses the compressed voice signal as a modulation signal. 5. The method of claim 1, 2, 3 or 4
The wireless relay device described.