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51. 发明专利

JPH10145834A METHOD FOR EXECUTING SOFT HAND-OFF FOR MOBILE COMMUNICATION SYSTEM, MOBILE COMMUNICATION SYSTEM AND RADIO BASE STATION FOR THE SAME 失效
公开(公告)号：JPH10145834A
公开(公告)日：1998-05-29
申请号：JP30308496
申请日：1996-11-14
申请人： FUJITSU LTD
发明人： YAMASHITA ATSUSHI , ASANO MASAHIKO
IPC分类号： H04W36/18 , H04W36/38 , H04Q7/22 , H04Q7/28
摘要： PROBLEM TO BE SOLVED: To reduce the burden of a mobile exchange station (MSTO) by performing soft hand-off control under the control of one of plural radio base stations (BTSs) between the MTSO and the plural BTSs by connecting the adjacent BTS through a communication path separated from the MTSO. SOLUTION: Each BTS 12 is connected with its mutually adjacent BTS by a line. When a mobile station(MS) 18 detects the quality of line between the MS 18 and a BTS 121 is degraded and the quality of line with a BTS 122 is improved and reports it to the BTS 121 , the BTS 121 requests the execution of soft hand-off to the BTS 122 . When there is any idle channel at the BTS 122 , the MS 18 is simultaneously connected with the BTS 121 and BTS 122 and a soft hand-off mode under the control of the BTS 121 is started. Thus, down traffic information is transmitted from the MTSO to the BTS 125, simultaneously transferred from the BTS 121 to the BTS 122 as well and respectively transmitted from the BTSs 121 and 122 to a radio channel.

52. 发明专利

JPH0730464A SPREAD SPECTRUM DEMODULATOR 失效
公开(公告)号：JPH0730464A
公开(公告)日：1995-01-31
申请号：JP17174193
申请日：1993-07-12
申请人： FUJITSU LTD
发明人： HATAZOE NAMI , YAMASHITA ATSUSHI
IPC分类号： H04B1/69 , H04B1/707
摘要： PURPOSE:To provide a spread spectrum demodulator capable of effectively utilizing the soft decision processing gain of an error correction decoder. CONSTITUTION:This demodulator is provided with an operation part 1 for finding out respective correlation values among a receiving signal in the m-th information sequence and k different diffusion codes in the m-th information sequence, an optimum code selecting part 2 for selecting a diffusion code having the maximum correlation with the receiving signal based upon these correlation values, a reverse diffusion part 3 for reversely diffusing the selected diffusion code to a code information in the n-th information sequence, and an information adding part 4 for adding a correlation value having the maximum correlation with the receiving signal to the reversely diffused code information. The demodulation is also provided with an operation part 5 for finding out respective correlation values among the receiving signal in the m-th information sequence and k diffusion signals in the m-th information sequence in each unit information of the n-th information sequence to be demodulated and an information selecting part 6 for selecting k correlation values having maximum correlation with k information elements in the unit information to be modulated based upon respective correlation values.

53. 发明专利

JPH0697971A DELAY DETECTION DEMODULATOR 失效
公开(公告)号：JPH0697971A
公开(公告)日：1994-04-08
申请号：JP24532892
申请日：1992-09-16
申请人： FUJITSU LTD
发明人： MATSUYAMA KOJI , FURUKAWA HIDETO , YAMASHITA ATSUSHI
IPC分类号： H04L27/227 , H04L27/22
摘要： PURPOSE:To miniaturize a delay detection demodulator, to lower the power consumption of the delay detection demodulator and to perform more accurate phase discrimination to reception signals relating to the delay detection demodulator used in a mobile radio communication system, for instance. CONSTITUTION:In the delay detection demodulator provided with a delay detection part 1 and a data discrimination part 2 for discriminating a difference part and outputting demodulated data, a frequency conversion means 3a for multiplying the local signals of an (n) phase generated by using the local signals of a frequency fL to be impressed and the reception signals of the frequency fIF and taking out the frequency conversion signals of the (n) phase by the frequency (fL-fIF) to be outputted is provided. Phase numbers are assigned beforehand to all states which the output of the frequency conversion means 3a can obtain and a phase discrimination means 4 for outputting the corresponding phase number as the phase data of the reception signals of the frequency fIF to the delay detection part is provided.

54. 发明专利

JPH0554292B2 失效
公开(公告)号：JPH0554292B2
公开(公告)日：1993-08-12
申请号：JP3881284
申请日：1984-03-02
申请人： FUJITSU LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： YAMASHITA ATSUSHI , KATO TADAYOSHI , KURIHARA HIROSHI , ATSUGI GAKUO , SHOMURA TATSURO
IPC分类号： H04B7/155 , H04B7/24 , H04J3/00 , H04L27/22 , H04L27/227

55. 发明专利

JPH05160806A METHOD FOR GENERATING CODE SERIES HAVING PHASE INFORMATION IN AUTOCORRELATION AND CORRELATION CIRCUIT USING CODE SERIES 失效
公开(公告)号：JPH05160806A
公开(公告)日：1993-06-25
申请号：JP34873391
申请日：1991-12-05
申请人： FUJITSU LTD
发明人： MATSUYAMA KOJI , YAMASHITA ATSUSHI
IPC分类号： H04J13/00 , H04B1/7085 , H04J13/10
摘要： PURPOSE:To attain phase synchronism for a delay lock loop or the like and to miniaturize a device by forming a correlation circuit employing a code series having position information in its autocorrelation. CONSTITUTION:Adjacent ternary M series codes are phase-shifted sequentially one by one bit so as to have a phase difference in each bit in a leading direction to form (2 -1) sets of codes, the codes are linked to generate a code series as one period by a code series generator 2 and the series is sent to correlation devices (1-0) to (1-5). Each correlation device 1 takes the correlation between an input signal and the code series. The correlation outputs of even numbered phases of the correlation devices 1-0, 1-2, 1-4 are added by an adder 3 and the correlation outputs of odd numbered phases of the correlation devices 1-1, 1-3, 1-5 are added by an adder 4. A multiplier 6 multiplies a correlation output A4 with -1 and the output is inverted and the result is added to a correlation output A3 by an adder 5. Then the difference A5 of the correlation outputs are fed to a VCO 8 as a control voltage through a loop filter 7.

56. 发明专利

JPH0563633A NETWORK CONTROL SYSTEM 失效
公开(公告)号：JPH0563633A
公开(公告)日：1993-03-12
申请号：JP22837291
申请日：1991-08-12
申请人： FUJITSU LTD
发明人： TAKENAKA TETSUYOSHI , FURUKAWA HIDETO , FUJINO SHINJI , CHIKUMA SATOSHI , YAMASHITA ATSUSHI , INOUE TAKESHI
IPC分类号： H04B7/26
摘要： PURPOSE:To easily match controlled objects by controlling a control object of its own station at a succeeding time so that the relative error between the control object subject to filtering and its own control object is eliminated. CONSTITUTION:A communication means is provided between adjacent nodes, each node sends its own control object, and a node receiving the control object from an adjacent station applies being spatial filtering Fs or time filtering Ft to the control object of the adjacent station and controls the control object of its own station at a succeeding time so that the relative error between the control object subjected to filtering and its own control object is eliminated. Thus, the information relating to the control object is sent and received between its own node and a node in the vicinity of its own node to find out a relative error, then the relative error with respect to the control object at least in the vicinity of its own node is eliminated without provision of a special control station.

57. 发明专利

JPH04322541A VARIABLE TRANSMISSION SYSTEM 失效
公开(公告)号：JPH04322541A
公开(公告)日：1992-11-12
申请号：JP9090691
申请日：1991-04-23
申请人： FUJITSU LTD
发明人： YAMASHITA ATSUSHI , ISHIZAKI MASAYUKI , INOUE TAKESHI
IPC分类号： H04L25/497
摘要： PURPOSE:To reduce the deterioration in mis-synchronization probability and synchronization maintenance characteristic even when a bit error due to a transmission line is in existence. CONSTITUTION:Even when an error of even 1 bit is in existence, the error is spread and a value from a variable generator 1 outputting once each of values 1-n for one period is sent via a transmission line 2. A receiver side uses a variable generator 3 to output a variable to be received next based on the sent variable. The received variable and an output of the variable generator 3 are compared by a comparator 4. The result of comparison is inputted to a protection circuit 5, which discriminates synchronization/asynchronization and sends the result of discrimination to the variable generator 3. An output of the variable generator 3 when the protection circuit 5 synchronization is used as a reception value.

58. 发明专利

JPH03195227A SPREAD SPECTRUM CODE SYNCHRONIZING CIRCUIT 失效
公开(公告)号：JPH03195227A
公开(公告)日：1991-08-26
申请号：JP33570789
申请日：1989-12-25
申请人： FUJITSU LTD
发明人： NAKAMURA TADASHI , YAMASHITA ATSUSHI , USHIYAMA TAKAYUKI , IIZUKA NOBORU
IPC分类号： H04J13/00 , H04B1/7085
摘要： PURPOSE:To shorten the time up to synchronization establishment stably by utilizing principles such that an inverse spread code (M series code) synchronously with an input signal is immediately obtained when the input signal fetched to a shift register as an initial value has no error and the signal '0' is subject to spread modulation. CONSTITUTION:An input signal is given to one data input of a selection means 10. A circuit means 12 is provided with a shift register 120 and fetches an input signal sequentially when the selection means 10 selects the input signal and an M series code generator in a path of the selection means 10 is formed when other input is selected and generates an inverse spread code (M series code) by using the fetched value as the initial value. A correlation verification means 14 calculates the degree of the correlation between the inverse spread code and the input signal. A control means 16 controls the selection means 10 to input an input signal into the circuit means 12 as an initial value and selects the selection means 10 to form the M series code generator with the circuit means 12, and selects the selection means again to set an initial value to the circuit means 12 when an output of the correlation verification means 14 represents that no correlation is present between the inverse spread code and the input signal.

59. 发明专利

JPH0345583B2 失效
公开(公告)号：JPH0345583B2
公开(公告)日：1991-07-11
申请号：JP5817286
申请日：1986-03-18
申请人： FUJITSU LTD
发明人： YAMASHITA ATSUSHI , KATO TADAYOSHI , MORIWAKE MASARU
IPC分类号： H03M13/23

60. 发明专利

JPH02277329A SYNCHRONIZING CIRCUIT FOR RANDOM CODE FOR SPREADING SPECTRUM 失效
公开(公告)号：JPH02277329A
公开(公告)日：1990-11-13
申请号：JP9811289
申请日：1989-04-18
申请人： FUJITSU LTD
发明人： NAKAMURA TADASHI , YAMASHITA ATSUSHI , USHIYAMA TAKAYUKI , IIZUKA NOBORU
IPC分类号： H04J13/00 , H04B1/7075
摘要： PURPOSE:To quicken the establishment of synchronization by providing a shifter shifting a pseudo noise signal stored in advance. CONSTITUTION:A variable shift register 9 uses a reset signal Res generated at the same time as an input gate signal tw to decide a head code PN3 of a PN code generator 8, applies shift of bits to the code by a count output C of a counter 5 and outputs a pseudo random code PN4 synchronously with a spread input signal. An output of the variable shift register 9 is used to apply exclusive OR processing to the inputted spread signal with a spread demodulator 30, from which information data is outputted. Thus, the input spread signal is subject to inverse spread with an output of the variable shift register 9, and since the demodulated information data is coincident with the data of a sender and the pseudo random code PN4 being the synchronizing output is outputted directly from the variable shift register 9, much time is not required for generating an output.

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