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1. 发明专利

JP2001251216A CIRCUIT AND METHOD FOR CAPTURING SYNCHRONIZATION 失效
公开(公告)号：JP2001251216A
公开(公告)日：2001-09-14
申请号：JP2000060963
申请日：2000-03-06
申请人： OKI ELECTRIC IND CO LTD
发明人： AMAZAWA TAIJI
IPC分类号： H04B1/707 , H04B1/7075 , H04L7/00
摘要： PROBLEM TO BE SOLVED: To decide a threshold in a synchronization capturing circuit depending on a communication environment. SOLUTION: The synchronization capturing circuit is provided with a spread code generating section 102 that provides the output of a spread code 202 started from a received phase value that is sequentially revised, a correlation arithmetic section 103 that applies a correlation arithmetic operation to a received signal 201 and the spread code 202 to provide the output of a correlation power 204, a comparison section 109 that compares the correlation power 204 with a threshold 209 to provide an output of a phase value 210 when the correlation power 204 is larger than the threshold 209, and a multiplier section 108 that outputs the threshold value 209, in response to a value of a delay profile obtained by the correlation power 204 that is calculated in the past by the correlation arithmetic section 103.

2. 发明专利

JP2000050343A METHOD FOR DETECTING POSITION OF MOBILE STATION AND POSITION DETECTION SYSTEM FOR BASE STATION AND MOBILE STATION 失效
公开(公告)号：JP2000050343A
公开(公告)日：2000-02-18
申请号：JP21281698
申请日：1998-07-28
申请人： OKI ELECTRIC IND CO LTD
发明人： AMAZAWA TAIJI
IPC分类号： G01S5/06 , H04W56/00 , H04Q7/34
摘要： PROBLEM TO BE SOLVED: To make it possible to highly accurately measure the position of a mobile station by executing 2nd processing by using plural 1st processing results found out by respective base stations and detecting the position of the mobile station. SOLUTION: A common receiving signal is supplied from a synchronism acquisition part 18 to three synchronous follow-up parts 20 to 22 to supply propagation time data p1 to p3 indicating the generation timing of a spread code part sequence to respective synchronous follow-up parts 20 to 22. The follow-up part 20 finds out a correlation value between the receiving signal and the spread code part sequence of the generation timing while over-sampling data and obtains highly accurate propagation time data H1. the follow-up parts 21, 22 also similarly found out highly accurate propagation time data H2, H3. Respective up-down counters 23 to 25 obtain respective counter values CV1 to CV3 in accordance with these data H1 to H3. A shortest time detection circuit 26 simply compares these three counter values CV1 to CV3 and selects the shortest counter value. The selection means the selection of data providing the shortest propagation time out of the three data H1 to H3.

3. 发明专利

JPH0936778A SPREAD CODE GENERATING CIRCUIT AND RECEIVER FOR MOBILE COMMUNICATION 失效
公开(公告)号：JPH0936778A
公开(公告)日：1997-02-07
申请号：JP18387895
申请日：1995-07-20
申请人： OKI ELECTRIC IND CO LTD
发明人： AMAZAWA TAIJI , TAKEO KOUJI , NISHINO MASAHIRO
IPC分类号： H04B1/707 , H04B1/7075 , H04L7/00
摘要： PROBLEM TO BE SOLVED: To obtain the spread code generating circuit and the receiver for mobile communication in which a circuit having provision for a bus revision request is realized with a simple configuration. SOLUTION: A spread code generating circuit 11 is connected to a synchronization acquisition device generating relative path information based on a reception signal from a multi-path propagation path in the spread spectrum communication. The relative path information from the synchronization acquisition device is given to an address generating section 24, in which a relative phase with a basic index is given. Thus, when a path change request is received, an address counter section 25 decides how much the phase of the spread code outputted from a memory section 26 so far is shifted in which direction based on the relative path information.

4. 发明专利

JPH08331007A SYNCHRONIZATION TRACKING CIRCUIT 失效
公开(公告)号：JPH08331007A
公开(公告)日：1996-12-13
申请号：JP13324495
申请日：1995-05-31
申请人： OKI ELECTRIC IND CO LTD
发明人： NISHINO MASAHIRO , AMAZAWA TAIJI , SATO SHINICHI
IPC分类号： H04B1/707 , H04B1/7085 , H04L7/00
摘要： PURPOSE: To provide the synchronization tracking circuit excellent in the precision of synchronization tracking at a reception station in a mobile communication system based on the code division multiplex connection system. CONSTITUTION: A signal to noise ratio measurement circuit 20 measures a signal to noise power ratio (S/N) of a received signal IN. A correlation length discrimination circuit 30 decides the length of a correlation block based on a relational table 32 describing cross reference between the S/N and the length of the correlation block among an Early pseudo random (PN) signal S47e, a rate PN signal S471, and a reception signal IN. A delay locked loop circuit 40 obtains respectively the correlation among the Early pseudo random (PN) signal S47e, the rate PN signal S471, and the reception signal IN based on the length of the correlation block from the correlation length discrimination circuit 30 to detect a shift in the phase of the reception signal based on the difference and to change the phase of the Early pseudo random (PN) signal S47e and the rate PN signal S471 thereby approaching a difference from each correlation to be zero and tracking the Early pseudo random (PN) signal and the rate PN signal synchronously with the reception signal IN.

5. 发明专利

JPH0832550A PROPAGATION PATH ESTIMATION DEVICE 失效
公开(公告)号：JPH0832550A
公开(公告)日：1996-02-02
申请号：JP16765394
申请日：1994-07-20
申请人： OKI ELECTRIC IND CO LTD
发明人： AMAZAWA TAIJI , SATO SHINICHI , TAKEO KOUJI
IPC分类号： H04J13/00 , H04B1/711 , H04B7/26 , H04W24/00 , H04W24/08 , H04J13/04
摘要： PURPOSE:To estimate a propagation path characteristic in an excellent way even when a propagation environment is fluctuated. CONSTITUTION:A Doppler frequency detection part 30 detects a Doppler frequency sequentially at a prescribed period based on a correlation signal V1(i) from which a data modulation component is eliminated. An SNR arithmetic section 40 calculates a signal versus interference wave power ratio sequentially for a prescribed period based on the correlation signal V1(i) and a reception signal V2. An approximation data number decision section 50 decides the number of approximated data to minimize the estimate error by the least square method based on the output. An estimate value calculation section 60 uses the correlation signal V1(i) by the number of decided approximated data to calculate a parameter of the approximate function by the least square method and calculates an estimate value V3(i) of the propagation path characteristic from the correlation signal V1(i) based on the approximated function having the parameter.

6. 发明专利

JPH06311092A BASE STATION LINE CONTROLLER 失效
公开(公告)号：JPH06311092A
公开(公告)日：1994-11-04
申请号：JP9612393
申请日：1993-04-22
申请人： OKI ELECTRIC IND CO LTD
发明人： NISHINO MASAHIRO , AMAZAWA TAIJI , SUZUKI TAKAO
IPC分类号： H04W16/02 , H04B7/26 , H04W48/20 , H04W72/04 , H04W76/00 , H04Q7/04
摘要： PURPOSE:To reduce the generation of call loss in a base station where mobile stations are centralized, in the mobile communication system based on a frequency division multiplex connection time division multiplex connection communication system. CONSTITUTION:This controller has a call loss ratio calculation circuit 1 calculating the call loss ratio in the area (=cell) that a base station controls, a level determination circuit 2 determining the level of a pilot signal from the calculation result and a pilot signal transmitter 3 transmitting a pilot signal on this determined level. The level determination means determines the level of the pilot signal for the level which is decreased by the portion proportional to the deviation from a design call loss ratio when the loss of the base station is larger than the upper limit value of an allowable call loss ratio and determines the level of the pilot signal for the level which is increased by the portion proportional to the deviation from the design call loss ratio when the call loss of the base station is smaller than the lower limit value of an allowable call loss ratio. Thus, the generation of the call loss in the base station where mobile stations are centralized is reduced.

7. 发明专利

JP2001203623A BASE STATION ANTENNA SYSTEM 失效
公开(公告)号：JP2001203623A
公开(公告)日：2001-07-27
申请号：JP2000009736
申请日：2000-01-19
申请人： OKI ELECTRIC IND CO LTD
发明人： AMAZAWA TAIJI
IPC分类号： H01Q3/24 , H01Q3/26 , H01Q25/00 , H04B7/06 , H04B7/08 , H04B7/10 , H04B7/26
摘要： PROBLEM TO BE SOLVED: To solve a problem of a conventional base station antenna system that has caused excessive processing load from the standpoint of the circuit scale and also signal processing. SOLUTION: A mobile station under the management of a base station is provided with a multi-beam antenna section that forms a service range of the base station so as to cover it with a plurality of beams of a predetermined beam width in a predetermined direction for the base station antenna system in a wireless communication system belonging to any of a plurality of sectors configured by the base station and with a sector configuration section that groups a plurality of the beams of the multi-beam antenna section to configure sectors.

8. 发明专利

JP2000236288A PROPAGATION LINE ESTIMATING CIRCUIT 失效
公开(公告)号：JP2000236288A
公开(公告)日：2000-08-29
申请号：JP3409099
申请日：1999-02-12
申请人： OKI ELECTRIC IND CO LTD , FUJITSU LTD
发明人： AMAZAWA TAIJI
IPC分类号： H04J13/00 , H04B1/712 , H04B3/10 , H04B7/005
摘要： PROBLEM TO BE SOLVED: To obtain a high accuracy propagation path estimation value even when an insert signal is inserted by removing the data component corresponding to the insert signal from a demodulated signal, inserting a dummy data component, corresponding to a reference signal into the part, and thus regenerating a dummy reference signal. SOLUTION: A data component corresponding to the insert signal is removed from the demodulated signal, and the dummy data component corresponding to the reference signal is inserted into the part to regenerate a dummy reference signal. Even when the entire period of a frame is used to transmit not a pilot symbol and part of the period is used to transmit TCP bits, this circuit will remove signal components corresponding to the TCP bits from a correlative operation result signal S5 supplied to a pilot symbol correlator 5. Then data similar to the data obtained, when a signal of a pilot channel over which pilot symbols are transmitted successively and artificially can be generated.

9. 发明专利

JPH1198112A CORRELATION COMPUTING UNIT 失效
公开(公告)号：JPH1198112A
公开(公告)日：1999-04-09
申请号：JP25949097
申请日：1997-09-25
申请人： OKI ELECTRIC IND CO LTD
发明人： AMAZAWA TAIJI
IPC分类号： H04J13/00 , H04B1/7093 , H04B7/26 , H04L7/00 , H04W56/00
摘要： PROBLEM TO BE SOLVED: To improve reliability in the specification of a long code by computing the product sum of a received signal stored in a storage means and all spread codes outputted from a spread code generation means and calculating respective correlation values. SOLUTION: A digitally converted received signal inputted through a received signal input terminal 1 is inputted to a storage device 4. When long code synchronizing timing detected by a long code synchronizing timing detection part 23 is inputted to the storage device 4 through a synchronizing timing input terminal 2, the device 4 stores received signals equal to the previously determined number of samples. Then a CPU 24 reads out one code number stored in a long code storage part 25 and transmits the read code number to a spread code generation part 5 through a code number input terminal 3. The generation part 5 generates a spread code based on the code number and outputs the spread code to a product sum operation part 6. The operation part 6 executes product sum operation and outputs a correlation value.

10. 发明专利

JPH09294096A PROPAGATION PATH CHARACTERISTIC ESTIMATE DEVICE 失效
公开(公告)号：JPH09294096A
公开(公告)日：1997-11-11
申请号：JP10790896
申请日：1996-04-26
申请人： OKI ELECTRIC IND CO LTD
发明人： AMAZAWA TAIJI , SATO SHINICHI
IPC分类号： H04B7/005
摘要： PROBLEM TO BE SOLVED: To estimate a propagation path characteristic with high accuracy. SOLUTION: A converter 13 outputs a propagation path characteristic signal for each time interval Tf of predetermined known data based on reception symbol data and known data position information. An interpolation device 14 outputs the propagation path characteristic signal after interpolation at a reception symbol data interval Ts from the propagation path characteristic signal. A multiplier 15 multiplies the reception symbol data with the propagation path characteristic signal after interpolation to generate reception symbol data from which the propagation path characteristic is eliminated. A data discrimination device 16 applies soft discrimination and hard discrimination or the like to the reception symbol data after the propagation path characteristic is eliminated to provide an output of a data discrimination result. A multiplier 17 generates and outputs a pseudo propagation path characteristic signal including the noise component. A filter circuit 18 applies low pass filtering to the pseudo propagation path characteristic signal to provide an output of the propagation path characteristic estimate signal from which the noise component is eliminated.

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