专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

51. 发明专利

AU1016097A Frequency estimating circuit and AFC circuit using the same 未知
公开(公告)号：AU1016097A
公开(公告)日：1997-08-07
申请号：AU1016097
申请日：1997-01-14
申请人： MITSUBISHI ELECTRIC CORP
发明人： SOGABE YASUSHI
IPC分类号： H03H17/02 , H03J7/02 , H03J7/04 , H04L27/00 , H04L27/233 , G01R23/165 , H03L7/00 , H04B7/185

52. 发明专利

AU668254B2 Carrier detector 未知
公开(公告)号：AU668254B2
公开(公告)日：1996-04-26
申请号：AU5388794
申请日：1994-01-19
申请人： MITSUBISHI ELECTRIC CORP
发明人： SOGABE YASUSHI
IPC分类号： H04L27/00 , H03D1/00 , H04L27/22 , H04L27/18
摘要： A carrier detector which is capable of performing high-accuracy carrier detection even with patterns other than a CR pattern by processing signals on the frequency axis, regardless of the existence of the residual frequency due to the quasi-coherent detection. The carrier detector converts a received signal having been subject to the quasi-coherent detection, A/D conversion, filtering for eliminating noises and expressed on the time axis into that expressed on the frequency axis by the time axis/frequency axis converting circuit. An accumulator 2 accumulatively adds the signals expressed on the frequency axis, and a decision section compares the accumulated value output from the accumulator to a predetermined threshold to detect the coming of the burst so as to detect the carrier.

53. 发明专利

JP2000183856A MULTISTATION TRANSMISSION SYSTEM 失效
公开(公告)号：JP2000183856A
公开(公告)日：2000-06-30
申请号：JP35713398
申请日：1998-12-16
申请人： MITSUBISHI ELECTRIC CORP
发明人： SOGABE YASUSHI , ASANO MASAKO , ISHIZU FUMIO
IPC分类号： H04L1/06 , H04B7/26
摘要： PROBLEM TO BE SOLVED: To maintain communication quality when a conventional receiver is used by allowing a base station to perform continuous transmission by transmitting the same information burst plural times by using its own transmitter and to perform transmission by changing transmission timing from each station in every burst. SOLUTION: Base stations 1 and 2 transmit the same information to a mobile station 4 while changing transmission timing in every burst. A receiver 3 mounted on the station 4 receives the same information simultaneously transmitted from the stations 1 and 2. In this multistation transmission system performing continuous transmission in which the same information is transmitted plural times by using plural transmitter, delay quantity in each burst is changed by changing transmission timing from each station in each burst, a mobile station can perform stable communication at a position where it stops even if the mobile station stops moving by making the phase relationship between plural transmission signals random, and a circuit configuration also becomes simple because an adaptive equalizer and plural receivers are not needed any longer.

54. 发明专利

JP2000134667A MOBILE COMMUNICATION SYSTEM 失效
公开(公告)号：JP2000134667A
公开(公告)日：2000-05-12
申请号：JP30814798
申请日：1998-10-29
申请人： MITSUBISHI ELECTRIC CORP
发明人： SOGABE YASUSHI , ISHIZU FUMIO
IPC分类号： H04J11/00 , H04L7/00 , H04W36/08 , H04W56/00 , H04Q7/36
摘要： PROBLEM TO BE SOLVED: To switch a channel within a synchronizing processing time at the time of hand over short in a passing time. SOLUTION: In this mobile communication system provided with plural base stations, cells formed of the base stations and a mobile station, the base stations (a), (b) and (c) are clock-synchronized with each other, the base stations and the mobile station communicate with each other by using a multicarrier modulation system and at the time of hand over which switches the cells (a), (b) and (c), the channel is switched in a synchronize-holding state without the re- synchronizing processing of a clock.

55. 发明专利

JPH09214293A FREQUENCY ESTIMATION CIRCUIT AND AFC CIRCUIT USING THE SAME 失效
公开(公告)号：JPH09214293A
公开(公告)日：1997-08-15
申请号：JP1767396
申请日：1996-02-02
申请人： MITSUBISHI ELECTRIC CORP
发明人： SOGABE YASUSHI
IPC分类号： H03H17/02 , H03J7/02 , H03J7/04 , H04L27/00 , H04L27/233
摘要： PROBLEM TO BE SOLVED: To provide the highly precise frequency estimation circuit of a wide range operation with less operation quantity by executing time base-frequency axis conversion and estimating frequency information on the plural candidates of ▵f from the frequency of the maximum power spectrum. SOLUTION: A DFT circuit 2 converts a received input data group 1 which is inputted and sampled into a discrete signal on the frequency axis from a time base signal. The converted discrete signal is squared and the power spectrum is obtained. The power spectrum outputted from the DFT circuit 2 is inputted to a MAX search circuit 3. The MAX search circuit 3 retrieves the maximum value of the power level of the inputted power spectrum within an observed range, obtains and outputs the frequency f1 of the spectrum, where the power spectrum becomes the largest. A frequency operation circuit 60 operates the frequency f1 obtained in the MAX search circuit 3, and it is outputted as the estimation value fEST of ▵f.

56. 发明专利

JPH0685859A BURST DEMODULATOR 失效
公开(公告)号：JPH0685859A
公开(公告)日：1994-03-25
申请号：JP23475292
申请日：1992-09-02
申请人： MITSUBISHI ELECTRIC CORP
发明人： SOGABE YASUSHI
IPC分类号： H04L27/22
摘要： PURPOSE:To allow the demodulator to cope with high speed transmission processing by adapting the storage simultaneous demodulation system by a low speed sample, thereby relieving the load without deteriorating estimated accuracy. CONSTITUTION:An A/D converter 2 samples and quantizes a burst mode modulation wave subject to quasi-synchronization detection by a quasisynchronization detector 1 from a digital phase modulation burst reception signal 11. A carrier estimate means 4 estimates a carrier to correct a frequency and a phase to a sample point data signal 12 stored once for each burst in a buffer memory 3. An interpolation timing generating means 5 applies arithmetic operation to the corrected data signal 13 to estimate a Nyquist point, and generated interpolation timing information sets 14, 15 are given to a data correction means 6, which applies interpolation calculation to the correction data signal 13 to estimate Nyquist point data and to generate tentative demodulation data series 16, 17. A timing decision means 7 compares, discriminates and selects the accumulated the absolute values or the squared absolute values of data levels of the tentative demodulation data series 16, 17 for each burst, and the resulting demodulation data series 18 is discriminated by a data discrimination means 8, which outputs a demodulated data signal 19.

57. 发明专利

JPH04261248A BATCH DEMODULATOR 失效
公开(公告)号：JPH04261248A
公开(公告)日：1992-09-17
申请号：JP773791
申请日：1991-01-25
申请人： MITSUBISHI ELECTRIC CORP
发明人： SOGABE YASUSHI
IPC分类号： H03D3/00 , H04L27/01 , H04L27/22
摘要： PURPOSE:To obtain a demodulation signal with excellent quality by equalizing group delay caused by the group delay characteristic of a quasi-synchronization detection section. CONSTITUTION:An output of a quasi-synchronization detection section 100 is converted into a digital data by A/D converters 8, 9 and the data is stored in a memory 10. A fast Fourier transforming section 21 obtains a vector and implement Fourier transform from a data of in-phase and orthogonal components from the memory 10 onto a frequency axis. The conversion output and a correction value corresponding to a frequency outputted from a table 22 on which a correction of a group delay characteristic of the quasi-synchronization detection section are multiplied by a multiplier 23 to correct the group delay. The result of multiplication is converted into a data on a time axis by an inverse fast Fourier transforming section 25, timing regeneration and carrier regeneration are implemented and the phases of the sender and receiver sides are adjusted to obtain a demodulation signal with excellent quality.

58. 发明专利

JP2002094483A RADIO COMMUNICATION SYSTEM 失效
公开(公告)号：JP2002094483A
公开(公告)日：2002-03-29
申请号：JP2000393551
申请日：2000-12-25
申请人： MITSUBISHI ELECTRIC CORP
发明人： SOGABE YASUSHI , ISHIZU FUMIO
IPC分类号： H04L1/00 , H04B7/06 , H04J11/00
摘要： PROBLEM TO BE SOLVED: To reduce deterioration of reception electric field strength due to offset of each transmission signal at a reception edge, and to prevent the deterioration of reception characteristics, and to always maintain high communication quality, even when a transmission path state fluctuates even at the application of an SFN system or transmission diversity system, by using an orthogonal frequency division multiplex system for transmitting transmission signals which have the same information from a plurality of transmitting stations by using the same sub-carrier frequencies. SOLUTION: In the SFN system, transmitting stations 1 and 4 are provided with weighting means 10 and 11 for weighting the amplitude of the sub-carriers of OFDM modulated signals 3 and 6 differently for each transmitting stations 1 and 4.

59. 发明专利

JP2001136144A RECEIVER AND DEMODULATION METHOD 失效
公开(公告)号：JP2001136144A
公开(公告)日：2001-05-18
申请号：JP31551799
申请日：1999-11-05
申请人： MITSUBISHI ELECTRIC CORP
发明人： SOGABE YASUSHI
IPC分类号： H04N5/455 , H04J11/00 , H04L1/00
摘要： PROBLEM TO BE SOLVED: To obtain a receiver that can realize reduction in its circuit scale and an arithmetic quantity and highly accurate demodulation with a low bit error rate. SOLUTION: The receiver, that adopts an OFDM system for a transmission system, is provided with an FFT circuit 2 that converts a time sequence signal into a frequency sequence signal, a pilot demodulation circuit 3 that extracts a pilot signal from the frequency sequence signal, uses the pilot signal to correct (pilot demodulation) of the phase and the amplitude of a received signal in each subcarrier, then uses the signal after the correction to demodulate the received signal, and uses the pilot signal to calculate the received power of each subcarrier, and a weighting computing element 4 that applies weighing to the demodulated signal on the basis of the arithmetic result of the received power, and adopts a configuration where a weighted demodulation signal is converted into a prescribed data frame and a prescribed error correction processing is executed for the data frame.

60. 发明专利

JP2001034799A AUTOMATIC TOLL COLLECTION SYSTEM FOR TRAVELING VEHICLE AND ITS METHOD 失效
公开(公告)号：JP2001034799A
公开(公告)日：2001-02-09
申请号：JP20652399
申请日：1999-07-21
申请人： MITSUBISHI ELECTRIC CORP
发明人： ASANO MASAKO , SOGABE YASUSHI , ISHIZU FUMIO
IPC分类号： G07B15/00 , G08G1/017
摘要： PROBLEM TO BE SOLVED: To actualize a free flow system even when a radio wave signal such as a microwave is used. SOLUTION: An on-road machine 10 is equipped with a vehicle detection part 11 which detects the position of a traveling vehicle 20 allowed to travel in multiple lanes E1 to E3, a communication part 12 which confirms the collection of a road use toll by using a radio wave signal with the traveling vehicle 20 detected by the detection part 11, a direction detection part 13 which detects the direction to the traveling vehicle 20 by detecting the radio wave signal sent by the traveling vehicle 21 at the time of the transmission and reception by the communication part 12, and a control/processing part 14 which performs control specifying the traveling vehicle 21 by tracing the movement position of the traveling vehicle 21 according to the position of the traveling vehicle detected by the detection part 11 and the direction detection result of the direction detection part 13.

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