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1. 发明专利

JPH0254635A TDMA CHANNEL MONITORING DEVICE 失效
公开(公告)号：JPH0254635A
公开(公告)日：1990-02-23
申请号：JP20479588
申请日：1988-08-19
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MURASE ATSUSHI , ODATE HITOSHI , HORIKAWA IZUMI
IPC分类号： H04J3/00 , H04B7/26
摘要： PURPOSE:To omit an antenna for exclusive use of monitoring a TDMA channel and a channel filter by utilizing a sharing device. CONSTITUTION:A circulator 50 is provided between an isolator 18 and a channel filter connecting to a transmitter of a TDMA channel to branch the channel and the circulator 50 is connected to a monitor receiver 54 through an attenuator 52. A TDMA channel incoming from other base station is received by an antenna 8 in common use of transmission and reception similar to other channel and only the TDMA channel is selected by the channel filter via a band pass filter and a branch path of the multicoupler and the level is adjusted by the attenuator 52 and given to the monitoring receiver 54. In this case, the attenuator 52 is made variable to increase the attenuation in the case of a time slot sent from its own station, thereby reducing the required dynamic range for the monitoring receiver.

2. 发明专利

JPS6310827A TRANSMISSION OUTPUT CONTROL CIRCUIT 失效
公开(公告)号：JPS6310827A
公开(公告)日：1988-01-18
申请号：JP15264586
申请日：1986-07-01
申请人： KOKUSAI ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： OKUBO YOICHI , URABE KENZO , AKIYAMA TADASHI , SERA YASUO , HORISAWA TATEO , HORIKAWA IZUMI , ONOE SEIZO
IPC分类号： H04B1/04
摘要： PURPOSE:To improve transmission efficiency by providing a coupler, a rectifier, a low pass filter, a waveform generator and an adder so as to reduce the leading time of a transmission output. CONSTITUTION:A waveform generator 6 generates an optional single shot waveform rising faster than the leading of a sending output before addition of the waveform generator 6 and attenuated slowly at the incoming of a TXON signal, the waveform is added to a loop output from an LPF 5 by an adder 7 to utilize the control voltage from the waveform generator 6 at the leading of transmission and the output is stabilized by a feedback loop after a sufficient time for the end of leading. The method raising a signal forcibly by using the control voltage from the waveform generator 6 is stable because no feedback loop is utilized. When the leading is finished, since the response of the feedback system is deteriorated by the LPF 5, the stability is not lost and the leading time is quickened.

3. 发明专利

JPS5826227B2 失效
公开(公告)号：JPS5826227B2
公开(公告)日：1983-06-01
申请号：JP1510378
申请日：1978-02-13
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： HORIKAWA IZUMI
IPC分类号： H04L25/38 , H03M5/18 , H04L25/49 , H04L27/02

4. 发明专利

JPS55133145A SPACE DIVERSITY RECEPTION SYSTEM 失效
公开(公告)号：JPS55133145A
公开(公告)日：1980-10-16
申请号：JP3974379
申请日：1979-04-04
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： OKAMOTO SHIGEHARU , KOMAKI SHIYOUZOU , HORIKAWA IZUMI
IPC分类号： H04L1/06 , H04B7/08
摘要： PURPOSE:To enable to reduce the amplitude deviation within the band and delayed deviation at fading, by enabling to cancel the interference wave component which is a cause of requency selective fading in opposite phase state at all times. CONSTITUTION:Signal is received at the antennas 1, 2 spatially apart each other, it is branched at the couplers 10, 12, and one is fed to the synthesizer 4 and another is fed to the narrow band filters 11a-11c, 13a-13c. The level for the three points in the band is detected with the filters, it is compared at the level comparators 14-16, and the output is fed to the control direction discrimination circuit 17. On the other hand, the two point level is detected as to the output of the synthesizer 4 for level comparison, and the output is fed to the circuit 17. The discriminated output of the circuit 17 is inputted to the circuit 23, the phase shifter is driven with the circuit 23, and control is finished at the amount of phase shift when the level deviation within the band after synthesis is zero (the output of the comparator 22 is zero). When selected to the in-phase synthesis, the output of the phase detector 25 is used.

5. 发明专利

JPS55107365A DIGITAL SIGNAL RECEPTION SYSTEM 失效
公开(公告)号：JPS55107365A
公开(公告)日：1980-08-18
申请号：JP1436079
申请日：1979-02-13
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： HORIKAWA IZUMI , SHINSHI MASAAKI
IPC分类号： H04L27/14 , H04B1/10 , H04B1/76 , H04L25/06 , H04L25/08 , H04L25/24 , H04L25/38 , H04L27/00
摘要： PURPOSE:To realize the digital transmission of high quality easily, by eliminating the noise spectrum included in the band of digital signal and reproducing and adding only the signal component rejected from the output identified and reproduced. CONSTITUTION:After rejecting the narrow band noise fed in the digital signal band through the use of the narrow band noise rejection filter 2 with digital signal component, signal is reproduced with identification, reproduction or modulation, the signal component only lost is reproduced through the narrow signal pick up filter 8, and it is fed back to the addition circuit 3. Accordingly, since the signal waveform compensated so that no wave distortion component is present can be reproduced, the deterioration of digital signal transmission system is hardly caused to reject noise in the band.

6. 发明专利

JPS55107347A SPACE DIVERSITY RECEPTION SYSTEM 失效
公开(公告)号：JPS55107347A
公开(公告)日：1980-08-18
申请号：JP1435979
申请日：1979-02-13
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： OKAMOTO SHIGEHARU , KOMAKI SHIYOUZOU , HORIKAWA IZUMI
IPC分类号： H04L1/06 , H04B7/08
摘要： PURPOSE:To cancel the interference waves, by picking up the amplitude variation of synthesized signal with a plurality of frequencies, and determining the control direction from the magnitude of phase difference between antennas of each frequency based on it and the polarity of the level deviation in the band. CONSTITUTION:The amplitude variation of synthesized signal is fed to the band filters 12a-12c to pickup the frequency level of three points. The magnitude of the phase difference between the antennas 1 and 4 at each frequency according to the value picked up and the polarity of the level deviation in the band perform sampling at the sampling circuits 15a-15c, and the amplitude information corresponding to each frequency is fed to the processing circuit 20, where the determination of the drive direction of the phase shifter 5 required to cancel the interference waves in opposite phase state is made. Accordingly, the phase shifter 5 is set to optimum value at the drive circuit 10.

7. 发明专利

JPS5267244A VALTIIVALUE DISCRIMINATION UNIT 失效
公开(公告)号：JPS5267244A
公开(公告)日：1977-06-03
申请号：JP14345775
申请日：1975-12-01
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： HORIKAWA IZUMI , SAITOU YOUICHI
IPC分类号： H04L25/03 , H03D1/00 , H03M5/20 , H04B3/36 , H04L27/38
摘要： PURPOSE:To obtain a multi-value discrimination unit, which eliminates logical circuit with use of n-units of binary discriminator, (n-1) units of filter plus substractor.

8. 发明专利

JPS5267243A AMPLITUDE PHASE MODULATION SIGNAL DEMODULATION UNIT 失效
公开(公告)号：JPS5267243A
公开(公告)日：1977-06-03
申请号：JP14345875
申请日：1975-12-01
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： HORIKAWA IZUMI , SAITOU YOUICHI
IPC分类号： H04L27/38 , H03D5/00
摘要： PURPOSE:To eliminate effect of inperfect phase modulation by performing subtraction action at base band using multi-value discriminator comprising amplitude asjuster, transmission route equivalent low-lange band pass filter, subtractor and binary discriminator.

9. 发明专利

JPH048022A SIGNAL CONTROL SYSTEM 失效
公开(公告)号：JPH048022A
公开(公告)日：1992-01-13
申请号：JP10885590
申请日：1990-04-26
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKAHASHI KATSUMI , TANAKA KAZUE , HORIKAWA IZUMI
IPC分类号： H04Q7/38 , H04B7/26
摘要： PURPOSE:To efficiently transmit a call signal by allocating a different ID assigned fixedly to each radio base station or each channel hitherto repetitively, hourly and spatially. CONSTITUTION:A radio base station 14a assigns an optional ID to an automatic radio base station from an ID table stored in a memory. Then a radio base station 14b receives a control signal of peripheral radio base stations 14a, 14c to detect the allocated ID and retrieves other ID from the memory and allocates the ID to the radio base station in use. Similarly, the radio base station 14c detects the ID utilizing state of the surrounding zone and allocates an unused ID to the radio base station in use. The same ID of the control channel is used repetitively for the radio base station of the service zone apart by an interruption distance or over to decrease the number of ID patterns, thereby reducing the signal transmission quantity transmitted/received between the radio base station and the mobile equipment.

10. 发明专利

JPH03186043A RADIO DATA TRANSMITTER AND RECEIVER 失效
公开(公告)号：JPH03186043A
公开(公告)日：1991-08-14
申请号：JP32403589
申请日：1989-12-15
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TANAKA KIYOSHI , HORIKAWA IZUMI
IPC分类号： H03G3/20 , H04B1/40 , H04L27/01
摘要： PURPOSE:To compensate distortion which is generated by a transmitting power amplifier with simple constitution by inputting the demodulation output of a receiver to the distortion compensating circuit of a transmitter and forming a feedback loop for distortion compensation when data are sent and received on a time-division multiplex basis. CONSTITUTION:When data are sent, part of a sent wave is inputted to the reception part by a coupler 32 and it is considered that the coupler 32 may be coupled relatively roughly and only the isolation of an antenna switch 30 is enough since the reception part include an RF amplifier 33. A signal 35 which is demodulated at the time of the transmission is inputted to the distortion compensating circuit 25 and the feedback loop is formed including the transmission and reception parts to compensate the distortion which is generated by the power amplifier 29. The distortion compensating circuit 25 includes the power amplifier 29, the RF amplifier 33, a demodulator 34, the circuit which compensates the delay of a phase, and a feedback loop filter. Consequently, the distortion of the transmitting power amplifier 29 can be compensated with the constitution which is relatively small in circuit scale.

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