专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JPH0646013A C/N MEASURING INSTRUMENT 失效
公开(公告)号：JPH0646013A
公开(公告)日：1994-02-18
申请号：JP19988792
申请日：1992-07-27
申请人： FUJITSU LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： MISHIRO TOKIHIRO , TAKENAKA TETSUYOSHI , ONO TAKASHI , SHOMURA TATSURO
IPC分类号： H04B7/15 , G01R29/26 , H04B17/00 , H04B17/336 , H04J1/00 , H04L27/26
摘要： PURPOSE:To perform C/N (signal to noise) measurement free from an influence of IM noise with a simple constitution by performing C/N measurement of only a specific carrier and correcting the C/N based on reception levels of respective carriers. CONSTITUTION:An input signal is divided into carrier components having prescribed frequencies f1 to fn by plural band filters 10 different by center frequencies, and their reception levels C1 to Cn are measured by plural reception level measuring means 12. A C/N measuring means 14 measures C/N of the carrier f1. A correction value calculating means 20 calculates an average value of level differences between the reception level C. of the specific carrier measured by the reception level measuring means 12 and reception levels C2 to Cn of the other carriers and calculates a C/N correction value gamma. A C/N correcting means 22 corrects C/N, namely, C1/N1 measured by the C/N measuring means 14 by the C/N correction value gamma and outputs the result.

2. 发明专利

JPH05252084A 失效
公开(公告)号：JPH05252084A
公开(公告)日：1993-09-28
申请号：JP4580292
申请日：1992-03-03
申请人： FUJITSU LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： TAKENAKA TETSUYOSHI , TOZAWA YOSHIHARU , MISHIRO TOKIHIRO , KAZAMA HIROSHI
IPC分类号： H04B1/04 , H04B7/15
摘要： PURPOSE:To attain the stable control of transmission power by controlling an increase rate of transmission power at a succeeding time so that a reception C/N estimated from the increasing rate of transmission power is equal to an actually measured C/N thereby generating control information with a small scale circuit. CONSTITUTION:An output of a transmission power control section 4 from a modulator 3 is sent to a satellite repeater 2 via an outdoor equipment 5, the equipment 5 receives its own station signal reflected in the repeater 2 and the signal is demodulated by a demodulator 6. A C/N conversion section 7 calculates the actually measured C/N from the demodulation output, and an arithmetic operation section 8 calculates information used for the control section 4 to control the transmission power at a succeeding time based on an increasing rate X of the transmission power at a current point of time at a fine weather and on the actually measured C/N. The arithmetic operation is implemented by including each of conditions such as rainfall attenuation quantities Lu, Ld, deterioration in reception C/N, a propagation time and a frequency of a radio wave for both up-link and down-link. Thus, control information is generated with a small scale circuit and stable control of transmission power is attained.

3. 发明专利

JPH06276176A CDMA COMMUNICATION SYSTEM 失效
公开(公告)号：JPH06276176A
公开(公告)日：1994-09-30
申请号：JP5845793
申请日：1993-03-18
申请人： FUJITSU LTD
发明人： TAKENAKA TETSUYOSHI , USHIYAMA TAKAYUKI , YAMASHITA ATSUSHI
IPC分类号： H04B7/26 , H04J13/00 , H04W28/18 , H04W72/04
摘要： PURPOSE:To reduce intra-signal interference at the time of demodulating signals from respective remote stations and to solve a perspective problem by preparing plural chip rates and appropriately allocating them for the respective remote stations. CONSTITUTION:When the power level of reception signals initially detected by a reception power detection part 5 is as showh by a figure (b) for the signals from the remote stations RS1 and RS2 inputted to the spectrum inverse spread demodulation part 4 of a base station BS3, a chip rate deciding blade 6 judges that the reception power level of the RS1 is to be strong interference in the inverse spread demodulation of the signals of the RS2. Then, the present chip rate Cj of the RS1 is changed and decided to be Ci lower than the Cj and the RS1 is informed from a chip rate informing part 7. In the RS1, a spreading code is generated corresponding to the chip rate Ci informed from the BS by a spreading code generation part 8, is supplied to a spectrum spread modulation part 9 to perform spectrum spread modulation and is transmitted to the BS. Thus the reception power level from the RS1 and RS2 in the BS is turned to be as shown by the figure (c,) the BS performs an inverse spread processing by the chip rate Cj and the interference is reduced.

4. 发明专利

JPH05244070A 失效
公开(公告)号：JPH05244070A
公开(公告)日：1993-09-21
申请号：JP4123692
申请日：1992-02-27
申请人： FUJITSU LTD
发明人： TAKENAKA TETSUYOSHI , NAKAMURA TADASHI , TAJIMA YOSHIHARU
IPC分类号： H04Q7/36 , H04B7/26 , H04Q7/28 , H04Q7/04
摘要： PURPOSE:To equally treat users as to serviceability by the radio channel allocation system in the mobile communication system for land mobile radio telephone, portable telephone, etc. CONSTITUTION:When the mobile communication system consisting of plural radio base stations 2-1-2-N, plural mobile stations 3-1-3-M, and a radio channel control station 1 allocates radio channels to the radio base stations 2-1-2-N, the radio base stations 2-1-2-N measure loss probability. The radio channel control station 1 preferentially allocates the radio channel to the radio base stations 2-1-2-N which exceed a reference value at the time of radio channel allocation requests from the radio base stations 2-1-2-N which exceed the reference value so that the respective radio base stations will be less in loss probability than the reference value.

5. 发明专利

JPH04290339A BURST DEMODULATOR 失效
公开(公告)号：JPH04290339A
公开(公告)日：1992-10-14
申请号：JP8089491
申请日：1991-03-19
申请人： FUJITSU LTD
发明人： TAKENAKA TETSUYOSHI , FURUKAWA HIDETO , KATO TADAYOSHI
IPC分类号： H04L27/227 , H04L27/22
摘要： PURPOSE:To improve the demodulation burst characteristics in the burst demodulator by reducing the failure possibility of carrier wave reproduction or bit timing reproduction while expanding the frequency pull-in range of the carrier wave and preventing the hang-up at the time of phase pull-in. CONSTITUTION:Plural carrier wave reproduction circuits 1011 to 101n with different initial oscillation frequency fi-1 to fi-n and/or initial phase thetai-1 to thetai-n are parallelly operated and the carrier wave reproduction of the burst signal is performed. The synchronized carrier wave reproduction circuit in the preamble of the burst signal is selected and the burst signal is demodulated by using the selected carrier wave reproduction circuit.

6. 发明专利

JPH04149731A MULTIPLIER CIRCUIT 失效
公开(公告)号：JPH04149731A
公开(公告)日：1992-05-22
申请号：JP27573990
申请日：1990-10-15
申请人： FUJITSU LTD
发明人： YUDA TSUTOMU , TAKENAKA TETSUYOSHI , ITO ETSUKO
IPC分类号： G06F7/52 , G06F7/53 , G06F7/533
摘要： PURPOSE:To shorten the time for multiplication processing and to attain miniaturization of the multiplier circuit by obtaining the product of two numbers while performing one stage of correction processing. CONSTITUTION:The partial product of the negative expression of multiplicand and the most significant bit of multiplier by a first calculation means 111, and this partial product and the other partial product obtained by plural second calculation means 121 are added by an addition means 131. The addition result by this addition means 131 become equal to the result applying the correction to the direct product between the multiplicand and the multiplier. Therefore, the product between the multiplicand and the multiplier can be obtained by performing one stage of correction based on the output of the third calculation means 141 by a correction means 140. Thus, the time for multiplication can be shortened, and the miniaturization of the multiplier circuit can be attained.

7. 发明专利

JPH03258057A AUTOMATIC FREQUENCY CONTROL CIRCUIT 失效
公开(公告)号：JPH03258057A
公开(公告)日：1991-11-18
申请号：JP5609490
申请日：1990-03-07
申请人： FUJITSU LTD
发明人： TAKENAKA TETSUYOSHI , FURUKAWA HIDETO
IPC分类号： H04L27/227 , H04L27/22
摘要： PURPOSE:To utilize respective advantages of a frequency discrimination type AFC circuit and a sweep type AFC circuit by receiving a frequency discrimination output whose offset is a prescribed level, giving a control output in the same locking direction to converge the frequency deviation to a voltage controlled oscillator so as to control the oscillated frequency. CONSTITUTION:An adder section 3 giving a prescribed offset epsilon to a discrimination output (d) of a frequency discriminator 2 is provided and a loop filter 4 controls the oscillating frequency of a VCO 5 so that a value (d+epsilon) converges a frequency deviation DELTAf between a reception signal frequency fin and the oscillated frequency fvco of the VCO 5 is converged. Since the frequency discrimination type AFC control and the sweep type AFC control coexist so as to provide a prescribed offset to an output of the frequency discriminator 2, a defect of the frequency discriminator AFC when the frequency fluctuation exceeds the transmission speed and a defect of the sweep type AFC requiring external control and possible for production of pseudo synchronization are compensated together.

8. 发明专利

JPH02290319A AUTOMATIC FREQUENCY CONTROL CIRCUIT 失效
公开(公告)号：JPH02290319A
公开(公告)日：1990-11-30
申请号：JP2329390
申请日：1990-01-31
申请人： FUJITSU LTD
发明人： FURUKAWA HIDETO , TAKENAKA TETSUYOSHI , TOZAWA YOSHIHARU
IPC分类号： H03L7/06 , H03J7/02 , H04L27/22
摘要： PURPOSE:To decide the frequency pull-in range with a frequency variable width of a local oscillation without affected by the band limit of a waveform shaping filter by identifying the polarity of the output of a frequency discriminator, and supplying the value of an up-down counter in response to the result of identification to a VCO. CONSTITUTION:The polarity of the output of a frequency discriminator 2 having an output characteristic whose one period exceeds a limit band of a waveform shaping filter(DTF) is identified by a polarity identifier device 5 and an up-down counter 6 as a loop filter counts the result of discrimination. Thus, the output frequency of the local oscillator VCO 17 is controlled and when the signal is at the outside of the band of the DTF and even when the output of the discriminator 2 is consecutive logical 0, it is identified by the identifier 5 to operate the counter 6. Thus, the pull-in up to the variable width of the VCO is attained easily independently of the band width of the DTF.

9. 发明专利

JPH07131394A DIVERSITY RECEPTION CONTROL SYSTEM 失效
公开(公告)号：JPH07131394A
公开(公告)日：1995-05-19
申请号：JP27330793
申请日：1993-11-01
申请人： FUJITSU LTD
发明人： OBUCHI KAZUCHIKA , NAKAMURA TAKAHARU , KAWABATA KAZUO , TAKENAKA TETSUYOSHI , NAKAMURA SATOSHI , FUKUDA EISUKE
IPC分类号： H04B7/08 , H04B7/26
摘要： PURPOSE:To take into account the characteristic of the full rate system and the half rate system and to reduce the power consumption on the diversity reception control system switching the antenna selection diversity system and the selected diversity system after detection. CONSTITUTION:The system is provided with the 1st and 2nd antennas 1 and 2, the 1st and 2nd reception parts 3 and 4, data processing part 5, power source part 6, the 1st and 2nd switching parts 7 and 8, switching circuit 9. The 1st switching part 7 makes the antennas 1 and 2 to the antenna selection diversity system to be selected and switched at the time of connection during waiting for receiving the control burst in the full rate system and during the communication accepting the communication burst in the full rate system. During the communication accepting the communication burst in the half rate system, the 2nd switching part 8 switches the 1st and 2nd reception parts 3 and 4 to the selected diversity system after detection to be selected and switched at the time of connection.

10. 发明专利

JPH06104833A SIGNAL TRANSMISSION SYSTEM 失效
公开(公告)号：JPH06104833A
公开(公告)日：1994-04-15
申请号：JP25429492
申请日：1992-09-24
申请人： FUJITSU LTD
发明人： TAKENAKA TETSUYOSHI , MATSUYAMA KOJI
IPC分类号： H04B10/516 , H04B10/524 , H04B10/58 , H04B10/61 , H04B14/06 , H04B10/04 , H04B10/06
摘要： PURPOSE:To provide the signal transmission system to send an analog signal through an optical fiber. CONSTITUTION:A sender side is provided with a modulation means 1, which converts an input analog signal into a signal comprising a pulse train, with an electrooptic conversion means 2 to convert the signal comprising the pulse train into an optical signal and the optical signal is sent through an optical fiber 3. A receiver side is provided with an optoelectric conversion means 4, which converts the received optical signal into an electric signal, with a demodulation means 5 converting the pulse train of the electric signal into the original analog signal.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式