公开(公告)号：JPH02270442A

公开(公告)日：1990-11-05

申请号：JP9062389

申请日：1989-04-12

Applicant: TOSHIBA CORP

Inventor： NAKAMURA MAKOTO ,  KODAMA TOMOKO

IPC: H03M13/00 ,  H03M13/15 ,  H04L27/34

Abstract: PURPOSE:To realize high coding efficiency and high reliability by providing an error correction means using all or a part of n-set of series deciding a signal point arrangement as a symbol and applying the coding/decoding of a Reed- Solomon code. CONSTITUTION:Eight digital signal series inputted to terminals (11-1)-(11-8) are subjected to differential coding by differential logic circuits (12-1)-(12-4) and led to Reed-Solomon coders 13-1 and 13-2. The Reed-Solomon coders 13-1 and 13-2 apply coding by using a received 4-bit signal as a symbol. Output signals of Reed-Solomon decoders 16-1 and 16-2 are led to the differential logic decoding circuits (17-1)-(17-4) as the sets of signal series corresponding to each other and additive arithmetic operation is implemented and the signal is regenerated and outputted to output terminals (10-1)-(10-8). Thus, one symbol error is realized with the coding rate of 87%.

公开(公告)号：JPH02145038A

公开(公告)日：1990-06-04

申请号：JP29823988

申请日：1988-11-28

Applicant: TOSHIBA CORP

Inventor： NAKAMURA MAKOTO ,  KODAMA TOMOKO

IPC: H04L1/00 ,  H04L1/18

Abstract: PURPOSE:To attain the high utilizing efficiency of a communication with high reliability even if the state of the communication line is deteriorated by transmitting only an information frame in the information subjected to error detection coding and symbol error correction coding in the transmission of a 1st cycle and transmitting a redundancy block in the transmission of a 2nd cycle. CONSTITUTION:(h-1).r Sets of blocks composed of a redundancy symbol for error correction by RS coding are generated and stored in a storage circuit 24 together with information blocks. The storage circuit 24 outputs only signals from a 1st line to the r-th line among the information stored therein to a terminal 12 via a modulator 25 and completes the transmission of the 1st cycle. Upon the receipt of an acknowledge signal to the transmission of the 1st cycle, a maximum value deciding circuit 27 detects a maximum retransmission request block number and outputs the value to the storage circuit 24 as the instruction signal of the 2nd cycle transmission, and the redundancy blocks stored from the (r+1)th are outputted by a instructed number only as the 2nd cycle transmission to the terminal 12 via the modulator 25.

公开(公告)号：JPS63246051A

公开(公告)日：1988-10-13

申请号：JP7751287

申请日：1987-04-01

Applicant: TOSHIBA CORP

Inventor： NAKAMURA MAKOTO

IPC: H04L12/28

Abstract: PURPOSE:To eliminate the need for a waiting time in case of retransmission after collision by preparing a channel comprising plural carrier frequencies and selecting optionally the carrier frequency and the sent time optionally in sending a signal. CONSTITUTION:Terminal stations 10a-10p comprising small sized earth stations send a data signal to a large sized earth station being s hub station 20 via a satellite 30. The stations 10a-10p select one frequency among carrier frequencies f1-f5 of the channel when a data to be sent exists at random and send a burst signal in matching with the transmission time slot. Moreover, they receive a collision signal from the hub station 20 and when its own station sends a data to the time slot corresponding to the collisin signal, the station sends the data again. In case of data retransmission, the transmission carrier frequency is selected at random again and the transmission time is selected at random in the range of, e.g., 1-5 slots.

公开(公告)号：JPS63228839A

公开(公告)日：1988-09-22

申请号：JP6327087

申请日：1987-03-18

Applicant: TOSHIBA CORP

Inventor： HIROSE TSUGIHIRO ,  NAKAMURA MAKOTO

IPC: H04L1/20

Abstract: PURPOSE:To always monitor the quality of a circuit with no insertion of a specific signal for check of the circuit quality by performing the soft decision (multi-value decision) of the output of a demodulator to obtain reliability degree data on each information bit and to carry out statistic processing by an amount equal to an information bit string of prescribed length and deciding the circuit quality. CONSTITUTION:A soft deciding circuit 1 gives the soft decision (multi-value decision) to an analog output signal of a demodulator and outputs soft decision data. A bit reliability degree calculation circuit 3 converts the soft decision data into the reliability degree data to show the reliability degree of each information bit. A bit string reliability degree calculation circuit 4 performs the statistic processing of said reliability degree by an amount equal to the number of bits of the prescribed length and converts in into the reliability degree data of an information bit string of the prescribed length. A circuit quality deciding circuit 5 refers to said reliability degree data on the information bit string to decide whether the circuit quality higher or lower than a prescribed level and outputs the result of this decision. Thus it is not required to insert a specific signal for check of the circuit quality into the transmission data. Therefore, the circuit quality is monitored with no deterioration in transmission efficiency.

公开(公告)号：JPS6260320A

公开(公告)日：1987-03-17

申请号：JP20000585

申请日：1985-09-10

Applicant: TOSHIBA CORP

Inventor： NAKAMURA MAKOTO ,  SUGIYAMA FUMIO

IPC: H03M13/00

Abstract: PURPOSE:To ensure the error position of 2-bit or over simply by giving a syndrome to an address of a storage device and outputting a data representing the bit error location decided by a syndrome from the storage device. CONSTITUTION:A received data M'(X) is inputted to a syndrome detection circuit 11 in an error correction circuit to obtain a syndrome S(X). An error position detection ROM 12 uses the syndrome S(X) as an address input and a data E(X) representing the bit error location specified by the syndrome S(X) is outputted. That is, each data is stored in a storage location of the ROM 12 addressed by using the syndrome corresponding to all bit errors. Then the error bit of the received data M'(X) is inverted by a circuit composing of the error bit inverting circuit 13 based on all data E(X). Thus, the error correction is applied without a complicated algorithm and then the circuit constitution is simplified and the reliability is improved.

公开(公告)号：JPS622422A

公开(公告)日：1987-01-08

申请号：JP4596186

申请日：1986-03-03

Applicant: TOSHIBA CORP

Inventor： NAKAMURA MAKOTO ,  UNO SHINTARO

IPC: H04B7/15 ,  H01J1/00 ,  H01J3/00 ,  H04B7/208

Abstract: PURPOSE:To enhance channel utilization efficiency by dividing repeatedly a sub-group into further sub-groups having exclusively usable number of channels and realizing a communication channel having a layered structure. CONSTITUTION:A communication channel is divided into successive channel groups each of which has the largest number of exclusively usable channels for information transfer to be regarded as the first sub-group. Next, the first sub-group is divided repeatedly into further sub-groups having exclusive usable number of channels respectively, whereby a layer structured communication channel having the second, the third...sub-groups is obtained. And any information relating to channel access requirements is assigned to a sub-group having its exclusively usable number of channels necessary for information transfer. It follows from the above that idle channels exist in every fixed sub-group unit, information to be transferred can be assigned in good order and the succassive channels corresponding to a sub-group can easily be left, whereby channels utilization efficiency is enhanced.

公开(公告)号：JPS61202538A

公开(公告)日：1986-09-08

申请号：JP4391185

申请日：1985-03-06

Applicant: TOSHIBA CORP

Inventor： NAKAMURA MAKOTO ,  UNO SHINTARO

IPC: H04J1/00 ,  H04B7/15 ,  H04B7/204 ,  H04B7/208 ,  H04J3/00

Abstract: PURPOSE:To improve the line utilizing efficiency even if >=2 kinds of line connection requests with different channel capacity exists by assigning each information so that a consecutive channel with large channel capacity. CONSTITUTION:In case of transmission, in general, to mobile stations 201-20n, since a band of, e.g., 5 times is required in comparison with the transmission to fixed stations 101-10n, when a transmission connection request to the fixed stations 101-10n exists, an idle channel f2 for one channel's content is retrieved from a low frequency band for assignment. When a communication connection request to the mobile stations 201-20n exists, an idle channel for 5 channel's content (e.g., a low frequency region than the f20) is retrieved from a high frequency band for assignment. In the assignment above, the line setting occupy ing one channel's content is concentrated always on the low frequency region and the line setting occupying 5 channels' content is concentrated to the high frequency region. Thus, the call loss is reduced remarkably in comparison with the conventional system where the line is set at random in this case.

公开(公告)号：JPS6162251A

公开(公告)日：1986-03-31

申请号：JP18491684

申请日：1984-09-04

Applicant: Nippon Telegr & Teleph Corp ,  Toshiba Corp

Inventor： KORI TAKEJI ,  NAKAMURA MAKOTO ,  SUZUKI HIDEO

IPC: H04J1/05 ,  H04B7/208 ,  H04B7/212 ,  H04J1/10 ,  H04J4/00

CPC classification number: H04J4/005

Abstract: PURPOSE:To make realization of hardware easy and to reduce errors in data by giving spectrum shaping characteristic for shaping transmission characteristic from the input end of a modulating circuit section to the output end of a demodulating circuit section to desired characteristic to at least one of a polyphase filter and an inserted filter in a transmultiplexer of transmitting side or receiving side. CONSTITUTION:When spectrum shaping characteristic of roll-off characteristic HR for, for instance, PSK wave is requested to the receiving side, characteristic of the polyphase filter and inserted filter 4 is determined to, for instance, HR= HI.HT. That is, characteristic of the two is determined to make synthetic transmission characteristic of the polyphase filter and inserted filter 4 have desired spectrum shaping characteristic. By this way, signals to the demodulating circuit 5 can be spectrum shaped without adding a filter for spectrum shaping specially, and demodulated and reproduced data can be taken out from the demodulating circuit 5 to an output terminal at low error rate.

Abstract translation: 目的：通过将调制电路部分的输入端到解调电路部分的输出端的成形传输特性的频谱整形特性赋予数据中的错误，从而实现硬件并减少数据误差，达到所需特性， 多相滤波器和在发送侧或接收侧的多路复用器中插入的滤波器。 构成：当向接收侧请求例如PSK波的滚降特性HR的频谱整形特性时，多相滤波器和插入滤波器4的特性被确定为例如HR = HI.HT。 也就是说，确定两者的特性使得多相滤波器和插入滤波器4的合成传输特性具有期望的频谱整形特性。 通过这种方式，到解调电路5的信号可以是频谱形状的，而不需要专门用于频谱整形的滤波器，并且解调和再现数据可以从低解码率被从解调电路5取出到输出端。

公开(公告)号：JPS54149416A

公开(公告)日：1979-11-22

申请号：JP5794278

申请日：1978-05-16

Applicant: Nippon Telegr & Teleph Corp ,  Toshiba Corp

Inventor： KINOSHITA KOUTA ,  SUGIYAMA FUMIO ,  ASAKAWA SHIGERU ,  NAKAMURA MAKOTO ,  OKAI TSUKASA

IPC: H04L5/22 ,  H04J3/06 ,  H04L7/10 ,  H04L9/12

CPC classification number: H04J3/06

Abstract: PURPOSE:To establish accurately and easily synchronization at an arbitrary point even in the communication line having a large error rate by an easy detection, namely, discrimination of the second synchronizing signal based on the discrimination result of the first synchronizing signal. CONSTITUTION:Synchronous information of one frame consisting of the first synchronizing signal A of a code, which consists of peculiar code arrangement set previously between the transmission side and the receiving side, and the second synchronizing signal B indicating the position signal of the first synchronizing signal is transmitted periodically prescribed-number times. In the receiving side, when the first synchronizing signal of one frame is detected correctly, signal synchronization is established on a basis of discrimination of the second synchronizing signal, thereby obtaining the communication synchronous system.

Abstract translation: 目的：通过简单的检测，即通过第一同步信号的鉴别结果判别第二同步信号，即使在具有较大误码率的通信线路中，也可以在任意点准确地，容易地进行同步化。 构成：由代码的第一同步信号A构成的一帧的同步信息，其由先前在发送侧和接收侧之间设置的特殊代码排列组成，第二同步信号B指示第一同步信号的位置信号 周期性地传送规定次数。 在接收侧，当正确检测到一帧的第一同步信号时，基于对第二同步信号的鉴别建立信号同步，从而获得通信同步系统。

公开(公告)号：JPH08163101A

公开(公告)日：1996-06-21

申请号：JP29756894

申请日：1994-11-30

Applicant: TOSHIBA CORP

Inventor： NAKAMURA MAKOTO

IPC: H04L1/00 ,  H03M13/09 ,  H03M13/37 ,  H04L1/14 ,  H04L1/16

Abstract: PURPOSE: To suppress the deterioration of throughput caused by the extra redundant bits by adding only an error detection redundant bit to a transmission signal. CONSTITUTION: An error detection CRC bit is added to the transmission information inputted to an input terminal 151 by a detection encoding circuit 111. This transmission information is stored in a transmission buffer 112 as a transmission signal S (x) and also transmitted via a signal synthesizer 118. When an error is detected in a receiving device, a remainder signal re (s) acquired by using an error correction code generating polynomial is sent back to a transmitting device and received by a received signal discrimination circuit 121. Then a remainder signal generation circuit 113 divides the output signal S (x) of the buffer 112 by means of the generating polynomial to generate a remainder signal r1 (x). An addition circuit 114 secures an exclusive OR between both signals r1 (x) and re (x), and a correcting calculation circuit 115 applies the syndrome conversion to the OR to specify the error position. The error position information is sent back to the receiving device via an output terminal 152. Thereby the receiving device corrects the error bit and finishes its receiving operation.