JPS58170240A - Digital radio communication system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] il+ technical field of invention Ilj is a digital wireless communication system.

■Technical background Digital wireless communication in the microwave and millimeter wave bands is one of the medium-sized i! Mutual V14'hL and terminal station and intermediate center I! During the review, it is necessary to configure a meeting line that includes Il visual control. Therefore, efforts are being made to make this transmission as simple and inexpensive as possible.

■Prior art and problems The meeting aie+a including monitoring and control will be hereinafter described as a service signal in Honmei Tsumugi. Service signal transmission methods include a method in which the digital main signal is inserted/added at the time intervals of the digital main signal, a new time division multiplexed digital signal is created, and this signal is transmitted, and a method in which the signal is modulated by the digital main signal. There is a composite 'R111110,000 system in which a light PBK fiber bundle, a cable width modifier, etc. are applied to the modified wave to transmit it. In order to extract the service signal from the digital signal Kli, the province has installed intermediate relay stations with the same scale m*t as the terminal stations.
In addition, it was impossible to insert a service signal if the intermediate relay station was of a non-regenerative type. On the rear right, it is possible to transmit service signals between end stations and non-regenerative relay stations, and between non-regenerative relay stations, but since multiple transmissions are carried out, mutual influence of modulation amounts is unavoidable, resulting in a deterioration of visual quality. Moreover, the service signal also had the disadvantage that it could only be transmitted through a meeting room channel, for example.

141 OBJECTS OF THE INVENTION The object of the present invention is to convert the speed of frame-structured digital signals so that a non-modulated wave-span between frame signals is used as an area for service m transmission, and to simplify the process.
The purpose of the present invention is to provide a digital wireless communication system V that allows for discussions and control.

(51 Configuration of the Invention The configuration of the present invention is a digital wireless communication system that configures a time-division multiplexed digital signal t-frame and wirelessly transmits a modulated signal.
The speed is rapidly converted for each VX frame to form a non-R1Ml wave region between each frame on the time axis, and the original is unchanged.
When the wave is transmitted by applying f&I using a service signal, the result is 1.
'be.

181 Examples of inventions The actual state of the present invention shown in the drawings will be explained below.

FIG. 1 is a diagram showing a signal waveform according to an embodiment of the present invention, and FIG. 2 is a boot diagram showing the configuration of a terminal transmitting side. 1st
8! In J, ■ indicates the range of l frame (lν) of a time-division multiplexed digital signal, for example, a PCM signal, and ■
is the R1II signal of the speed fall, and the converting means will be explained in Section 2 below. Nine locations of 〒1 are created by converting the bit rate between adjacent frames. ■ is a plexus that has changed from the carrier wave veK! -Show me the waves/01 bait 4
As shown in the data for No. 11, this occurs in the unchangeable area temp between the adjacent frames. The time length of the service signal data is selected within the standard range and in relation to the synchronization signal described later. @ indicates that a different change depending on the service signal data has been applied to the kiln change wave region which has not been changed with respect to II change & OK. [F] is the ting pulse for the synchronization signal, ■ indicates the state of the wave, and the @ signal t - [F] pulse or punching [F] must be in the state of *transmission. It shows.

2nd hlG! 0 to [F
] corresponds to FIG. 1 and represents the position where the waveform is obtained. Moreover, FIG. 2 shows an example of t-combined transmission with PO haikugo and 2 channels for service signals. Speed conversion circuit 111PC+xsR1 Regarding the signal as shown in Figure 00, "C"
sR1 diagram speeds up to shorten the time of 17 frames.
get the signal.

For the digital input signal, punch out the digital signal using a 4-pulse train with a cycle faster than the clock cycle for 1 flight, or store the image signal once in the memory device 11K, and then output it one after another with a 3-speed 4-pulse train. By making it into a signal train, the signal shown in Figure 1 [stock] is obtained.
At DI, the carrier wave is attenuated and a signal @1 is obtained. In addition, the two service signal channels 8781 and 8782 are each passed through a speed conversion circuit 8P04 and a multiplexing circuit ■! is synthesized in Figure 1 of the @ issue. In the modulation path Mp2 @
Lol! ! ! When the result is given by , the signal 1st phase is obtained. Pulse the tie link pulse for the ij1 signal &
Obtained from enclosure BP (collection l-@) changeover switch av'41
;H control, a signal with no carrier wave state is obtained as shown in No. 1-0. Therefore, the signal OV? Apply to s unit TeR and antennam! Send from.

The next Km3- is a diagram showing the configuration of an intermediate relay station.

Regarding the output of the receiver R, the output circuit I) is decoded by the PM, the main damage signal and the service signal are separated by the separator DMUI, and the speed conversion (b) path 8PC1g! : Used as a signal via. The timing of the non-carrier period on the transmitting side is extracted by the tie detection circuit TE. Furthermore, the modulation amplifier, transmitter terminal, and multiplexing circuit MIT! The configuration for Send** is the same and operates in the same way.

+71 Effects of the Invention As described above, according to the present invention, the R-free area between 7 frames can be effectively used for transmission #3 of the service @ number with a relatively simple configuration. It is possible to form a signal-free, carrier-free region at the top of the wave range and easily achieve effective synchronization.

[Brief explanation of drawings]

Figure 1 is a diagram showing signal waveforms according to an embodiment of the present invention. Block 1 is a diagram showing the configuration of a relay station. Figure 2 is a diagram showing the configuration of an intermediate relay station. 〒, p... Inter-frame signal space MG--Ting generation circuit 5Pc-Speed conversion circuit 5p---Synchronous pulse oscillation circuit MD1, MD...flm @u8W...
Changeover switch 8711.8782-9- Bi x signal human power m child Patent applicant Fujitsu Ltd. agent Sosuke Benfundo Suzuki @ TsPl - 1st r'? 1 Third Flash

Claims (1)

[Claims] In a digital wireless communication system that configures time-division multiplexed digital signals into frames and wirelessly transmits the modulated signals, the input digital 4s*w speed is rapidly changed for each frame and the modulated signal is transmitted on the time axis. A digital wireless communication system characterized in that a tI-free 11-wavelength region is formed in each of seven frames, and the unchangeable wave is modulated by a service signal and transmitted.