公开(公告)号：EP0757493A2

公开(公告)日：1997-02-05

申请号：EP96111114.3

申请日：1996-07-10

申请人： NTT MOBILE COMMUNICATIONS NETWORK INC.

发明人： Adachi, Satoru ,  Miki, Toshio ,  Ohya, Tomoyuki ,  Kawahara, Toshiro

IPC分类号： H04N7/30

CPC分类号： H04N21/236 ,  H04N7/56 ,  H04N21/434

摘要： If a variable length code is caused to have a pseudo fixed length and transmitted in that condition, possible adverse effects due to out-of-synchronization attributable to code errors can be prevented, but it becomes difficult to enjoy this advantage in case an object to be fixed in length includes a block or blocks of variable length codes whose bit length is remarkably long. An object of the present invention is to obviate such a disadvantage as just mentioned. That is, for the transmission of variable length coded data blocks, a threshold arithmetic calculation circuit (9) obtains a threshold from an average of the bit lengths of the variable length coded data blocks for each group of such block., and the judgment circuit (10) makes a judgment as to whether or not those variable length coded data blocks have bit lengths exceeding the threshold of the block group to which such data blocks belong. Then, a block divider circuit 11 divides the variable length coded data blocks having bit lengths exceeding the threshold into blocks having small bit lengths. Each block thus obtained is fixedly equalized in bit length to an average length level and transmitted in that condition.

摘要翻译： 如果使可变长度码具有伪固定长度并在该条件下发送，则可以防止由于代码错误引起的不同步造成的可能的不利影响，但是如果对象 固定长度包括位长非常长的可变长度代码块或块。 本发明的目的是消除如上所述的这样的缺点。 也就是说，对于可变长度编码数据块的传输，阈值算术运算电路（9）从每个这样的块组的可变长度编码数据块的比特长度的平均值中获得阈值，并且判断电路 （10）判断这些可变长度编码数据块是否具有超过这些数据块所属的块组的阈值的位长度。 然后，块分割器电路11将具有超过阈值的位长度的可变长度编码数据块划分为具有小位长度的块。 如此获得的每个块在位长度固定均衡到平均长度水平并在该条件下传输。

公开(公告)号：EP0717505A3

公开(公告)日：1997-01-15

申请号：EP95308992.7

申请日：1995-12-11

申请人： NTT MOBILE COMMUNICATIONS NETWORK INC.

发明人： Miki, Yoshinori ,  Sawahashi, Mamoru

IPC分类号： H04B1/707

CPC分类号： H04B1/7103 ,  H04B1/7115

摘要： A CDMA receiver capable of effective orthogonalization even when the number of received signal vectors to be orthogonalized is very large. Received signals which have been spread by spreading codes are despread by despreading filters (11). Products of received signal levels and cross-correlations between the spreading codes are compared in a preliminary selector (20) of the cross-correlations, and Ns products are selected in order of magnitude, where Ns is a predetermined integer. Ns received signals associated with the selected products have priority to undergo orthogonalization. The number of signals to be orthogonalized by decorrelators (15) can be effectively decreased, and noise enhancement effect can be reduced on the reverse channels. The orthogonalized received signals are recovered through channel estimators (16), phase compensators (17), RAKE combiners (18) and decision blocks (19).

公开(公告)号：EP0750441A1

公开(公告)日：1996-12-27

申请号：EP96900186.6

申请日：1996-01-09

申请人： NTT MOBILE COMMUNICATIONS NETWORK INC.

发明人： WATANABE, Yasuyuki ,  NAKAIMA, Noriya ,  YAMAMOTO, Kouji ,  KATUTA, Moritosi

IPC分类号： H04Q7/38 ,  H04B7/26

CPC分类号： H04W28/24 ,  H04W36/12 ,  H04W76/10 ,  H04W88/181

摘要： Mobile communication is performed using an optimum voice coding system meeting the voice coding system provided by a radio zone and the voice coding capacity of a mobile station. Therefore, a control station which recognizes the state of handling of the voice coding system of a radio zone managed by the control station is made to store the selecting condition of a communication channel designated based on the use abilities of the voice coding system of a mobile station requested to establish a call set by an exchange and a mobile station to be connected when the communication channel between the mobile station and exchange is set up. In addition, by transmitting the selecting condition designated by the exchange as the information required to set up channel by another control station, the stored selecting condition is sent to each other when another radio zone extending across the control station is selected, or when the mobile station moves into another radio zone in which a voice coding system having the highest priority is usable, and consequently communication using a voice coding system of high priority is possible upon switching the channel during communication. Therefore, switching of communication channels using the optimum voice coding system can be made smoothly.

摘要翻译： 使用满足无线电区域提供的语音编码系统的最佳语音编码系统和移动台的语音编码能力来执行移动通信。 因此，识别由控制站管理的无线电区域的语音编码系统的处理状态的控制站被做成存储基于移动台的语音编码系统的使用能力指定的通信信道的选择条件 站建立由移动站和交换机之间的通信信道建立时由交换机和移动台建立呼叫建立连接的呼叫站。 另外，通过发送由交换机指定的选择条件作为由另一控制站建立信道所需要的信息，当选择延伸到控制台的另一个无线电区域时，或者当移动台 站点移动到具有最高优先级的语音编码系统可用的另一个无线电区域中，因此在通信期间切换信道时可以使用具有高优先级的语音编码系统的通信。 因此，可以顺利地进行使用最佳语音编码系统的通信信道的切换。

公开(公告)号：EP0749223A1

公开(公告)日：1996-12-18

申请号：EP95942278.3

申请日：1995-12-27

申请人： NTT MOBILE COMMUNICATIONS NETWORK INC.

发明人： HIGUCHI, Kenichi ,  SAWAHASHI, Mamoru ,  ADACHI, Fumiyuki

IPC分类号： H04J13/04 ,  H04B1/707 ,  H04L7/10 ,  H04L7/00

CPC分类号： H04J13/0077 ,  H04B1/70757 ,  H04B1/7077 ,  H04B1/708 ,  H04B1/7095 ,  H04J3/0602 ,  H04J13/0003

摘要： A CDMA system which can quickly establish initial synchronization of long codes which are spread-spectrum codes having periods which are much longer than the symbol length. The system inserts a priori codes which have a correlation value of nearly zero with respect to the long codes and an autocorrelation value which changes triangularly into spread-spectrum signals whose bandwidth is spread by the long codes at regular intervals, detects the timing at which reception of a priori codes is started, and estimates the reception phase of the long codes. The system is provided with an a priori code inserting circuit on the transmitting side and an a priori code replica generating circuit on the receiving side. The system is also provided with a plurality of correlators for finding the correlation value between the received signal and the replica of the a priori signal and a circuit for finding the maximum correlation value among the correlation values and its reception starting timing. The system estimates the timing at which that a priori signal is received from the reception starting timing at which the maximum correlation value is obtained, and infers that the point of time at a fixed time interval from the estimated timing is the point of phase reception of the long codes.

摘要翻译： 一种能快速建立长码初始同步的CDMA系统，长码是周期比符号长度长很多的扩频码。 该系统插入相关于长码的相关值近似为零的先验码和三角形地变换为其带宽以规则间隔由长码扩展的扩频信号的自相关值，检测接收的定时 开始先验代码，并估计长代码的接收相位。 该系统在发送端提供先验代码插入电路，在接收端提供先验代码复制品生成电路。 该系统还提供有多个相关器，用于找出接收信号与先验信号的复制品之间的相关值，以及用于找出相关值中的最大相关值及其接收开始定时的电路。 系统根据获得最大相关值的接收开始定时来估计接收先验信号的定时，并且推断出从估计的定时起的固定时间间隔的时间点是相位接收点 长码。

公开(公告)号：EP0508407B1

公开(公告)日：1996-12-18

申请号：EP92106077.8

申请日：1992-04-08

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION ,  NTT MOBILE COMMUNICATIONS NETWORK INC.

发明人： Fukawa, Kazuhiko ,  Suzuki, Hiroshi

IPC分类号： H04L25/30

CPC分类号： H04L25/03337

公开(公告)号：EP0734191A1

公开(公告)日：1996-09-25

申请号：EP95933642.1

申请日：1995-10-09

申请人： NTT MOBILE COMMUNICATIONS NETWORK INC.

发明人： UCHIDA, Noriko ,  MAEBARA, Akihiro ,  KOBAYASHI, Katsumi ,  YAMAMOTO, Koji ,  HIRATA, Syoichi, 1-107, NTT Oumebashi-syataku ,  SUGIYAMA, Kazuo ,  SOTOYAMA, Masumi ,  SASADA, Koji

IPC分类号： H04Q7/20 ,  H04B7/26

CPC分类号： H04W48/12 ,  H04B7/26 ,  H04W88/06 ,  H04W88/10

摘要： The technique will be applied, in the case where a data communication fixed station 3 and a voice communication fixed station 4 control a common service area, and will quicken connection between a mobile station 5 and the data communication fixed station 3. The data communication fixed station 3 notifies, sequentially, the voice communication fixed station 4 of channel informations (e.g., usable channels, traffic quantity). The voice communication fixed station 4 receives the channel information via a broadcast channel for voice communication, and broadcasts the channel information to the mobile stations. When the mobile station 5 is to execute packet communication with an ISDN 1 via the data communication fixed station 3, the mobile station 5 selects an appropriate channel among the channels broadcasted thereto, and notifies the data communication fixed station 3 of the selected channel. As such, since the mobile station 5 can determine the channel before the actual communication between the mobile station 5 and the data communication fixed station 3 takes place, the connection between the mobile station 5 and the data communication fixed station 3 can be quickened.

摘要翻译： 在数据通信固定站3和语音通信固定站4控制公共服务区域的情况下，将加速该移动站5与数据通信固定站3之间的连接。该数据通信固定 站3依次通知语音通信固定站4的信道信息（例如，可用信道，业务量）。 语音通信固定站4通过用于语音通信的广播信道接收频道信息，并向频道广播频道信息。 当移动站5经由数据通信固定站3执行与ISDN 1的分组通信时，移动站5在广播的信道中选择适当的信道，并向数据通信固定站3通知所选择的信道。 这样，由于移动站5可以在移动站5和数据通信固定站3之间的实际通信发生之前确定信道，所以可以加快移动台5与数据通信固定站3之间的连接。

公开(公告)号：EP0721264A1

公开(公告)日：1996-07-10

申请号：EP95921994.0

申请日：1995-06-20

申请人： NTT MOBILE COMMUNICATIONS NETWORK INC.

发明人： MIKI, Yoshinori ,  SAWAHASHI, Mamoru

IPC分类号： H04J13/02

CPC分类号： H04B1/7105 ,  H04J13/10 ,  H04J13/16

摘要： Each of receiving spreaded signals from K users via L channels for each user is de-spreaded with a spreading code allocated to each user. Interference components among signal components in the de-spreaded signal vector Z obtained are eliminated by a de-correlation filter (33) and pilot signals are detected by a pilot detection part (34) from the interference-eliminated signal vectors for multiple frames. Each of the detected pilot signals is divided by the pilot signal's known symbol to obtain a transfer function in a transfer function interpolation part (35) and a transfer function between consecutive pilot signals is estimated from the transfer functions of the consecutive pilot signals. A de-spreaded signal vector Z is supplied to a de-correlation filter (36) and interferences among signal components are eliminated and transmission distortion is also eliminated using the estimated transfer functions. Regarding the KL signal components obtained in the above process, L signal components corresponding to each user are composited by a phase compensation and composition part (37) so that K composite signals are generated. Those composite signals are level decided by a decision part (38) to regenerate K symbols from K users.

摘要翻译： 通过分配给每个用户的扩展码对每个用户经由L个信道的来自K个用户的每个接收分散信号进行解扩。 通过去相关滤波器（33）去除所获得的解扩信号矢量Z中的信号分量中的干扰分量，并且由针对多帧的干扰消除信号矢量由导频检测部分（34）检测导频信号。 每个检测到的导频信号被导频信号的已知符号除以在传递函数插值部分（35）中获得传递函数，并且根据连续导频信号的传递函数来估计连续导频信号之间的传递函数。 解扩信号矢量Z被提供给去相关滤波器（36），消除了信号分量之间的干扰，并且使用估计的传递函数也消除了传输失真。 关于在上述处理中获得的KL信号分量，对应于每个用户的L个信号分量由相位补偿和合成部分（37）合成，使得产生K个复合信号。 那些复合信号由决定部分（38）决定，从K个用户再生K个符号。

公开(公告)号：EP0719063A1

公开(公告)日：1996-06-26

申请号：EP95924515.0

申请日：1995-07-06

申请人： NTT MOBILE COMMUNICATIONS NETWORK INC.

发明人： NAGATA, Kiyohito ,  FUJII, Teruya ,  HAMADA, Katsunori ,  KAKINUMA, Kazuhiko ,  YOSHIMI, Masaaki ,  WAKABAYASHI, Tatsuaki

IPC分类号： H04Q7/36 ,  H04B7/26 ,  H04B1/40

CPC分类号： H04W88/08 ,  H03J1/0008 ,  H04B1/403 ,  H04B7/208 ,  H04B7/2621 ,  H04W24/00 ,  H04W88/02

摘要： A mobile communication system having a high precision frequency base station device with a high precision frequency generator, and the other low precision frequency base station device with a low precision frequency generator which receives transmission waves from the high precision frequency base station device using a transmission frequency in a prescribed frequency precision, and carries out transmission and reception by controlling transmission and reception frequencies of own station in accordance with the frequency precision of the received transmission waves. It is also fine to provide a mobile station device for a mobile station which receives the transmission waves from the high precision frequency base station device, controls a reference frequency to be a reference for transmission and reception frequencies of own station in accordance with the frequency precision of the received transmission waves, and carries out transmission and reception with respect to a base station using transmission and reception frequencies according to the controlled reference frequency, and make the low precision frequency base station device to receive the transmission waves from the mobile station device carrying out transmission and reception using the transmission and reception frequencies according to the controlled reference frequency, control a reference frequency to be a reference for transmission and reception frequencies of own station in accordance with the frequency precision of the received transmission waves, and carry out transmission and reception with respect to the mobile station using transmission and reception frequencies according to the controlled reference frequency.

摘要翻译： 一种具有高精度频率发生器的高精度频率基站装置和具有低精度频率发生器的低精度频率基站装置的移动通信系统，其使用传输频率从高精度频率基站装置接收传输波 以规定的频率精度，通过根据接收到的发送波的频率精度控制本站的发送和接收频率来进行发送和接收。 提供从高精度频率基站装置接收发送波的移动台的移动台装置，根据频率精度，将参考频率控制为本台站的发送和接收频率的基准 并且使用根据受控参考频率的发送和接收频率对基站进行发送和接收，并且使得低精度频率基站装置从携带有移动站装置的移动站装置接收发送波 根据受控参考频率使用发送和接收频率进行发送和接收，根据接收到的发送波的频率精度，将参考频率控制为本台站的发送和接收频率的基准，并进行发送和 雷杰普 根据受控参考频率使用发送和接收频率的移动台。

公开(公告)号：EP0717508A2

公开(公告)日：1996-06-19

申请号：EP95308993.5

申请日：1995-12-11

申请人： NTT MOBILE COMMUNICATIONS NETWORK INC.

发明人： Furukawa, Kenji ,  Nishi, Yakushi ,  Kobayashi, Hiroshi ,  Ohno, Yoshihisa ,  Kodama, Eiji, NTT Aougadai Dokushinryo A-306

IPC分类号： H04B7/005

CPC分类号： H04W52/228 ,  H04B7/18543 ,  H04W52/225

摘要： A transmission power control method in a mobile satellite communication system implementing accurate control of transmission power of a base station by obtaining an average received signal level at a mobile station at high accuracy. The mobile station measures an average received signal level Q k in a predetermined period (step SP2), and informs the base station of the average received signal level Q k and an actual measuring time T k (step SP3). The base station calculates a total measuring time t k which is the sum total of the actual measuring time T k (step SP16), a corrected average received signal level R k associated with the average received signal level during the total measuring time t k (step SP18), and a measuring error ΔD k (step SP17), and controls the transmission power on the basis of these values (step SP21). Estimating the measuring error ΔD k in the total measuring time t k longer than the individual actual measuring time T k makes it possible to reduce the measuring error, thereby implementing highly accurate transmission power control.

摘要翻译： 一种移动卫星通信系统中的发送功率控制方法，其通过以高精度获得移动站的平均接收信号电平来实现基站的发送功率的精确控制。 移动台在预定时间段内测量平均接收信号电平Qk（步骤SP2），并通知基站平均接收信号电平Qk和实际测量时间Tk（步骤SP3）。 基站计算作为实际测量时间Tk（步骤SP16）的总和的总测量时间tk，与总测量时间tk期间的平均接收信号电平相关联的校正平均接收信号电平Rk（步骤SP18） 和测量误差DELTA Dk（步骤SP17），并且基于这些值来控制发送功率（步骤SP21）。 在总测量时间tk中估计测量误差DELTA Dk比单个实际测量时间Tk长，可以减少测量误差，从而实现高精度的发射功率控制。

公开(公告)号：EP0717505A2

公开(公告)日：1996-06-19

申请号：EP95308992.7

申请日：1995-12-11

申请人： NTT MOBILE COMMUNICATIONS NETWORK INC.

发明人： Miki, Yoshinori ,  Sawahashi, Mamoru

IPC分类号： H04B1/707

CPC分类号： H04B1/7103 ,  H04B1/7115

摘要： A CDMA receiver capable of effective orthogonalization even when the number of received signal vectors to be orthogonalized is very large. Received signals which have been spread by spreading codes are despread by despreading filters (11). Products of received signal levels and cross-correlations between the spreading codes are compared in a preliminary selector (20) of the cross-correlations, and Ns products are selected in order of magnitude, where Ns is a predetermined integer. Ns received signals associated with the selected products have priority to undergo orthogonalization. The number of signals to be orthogonalized by decorrelators (15) can be effectively decreased, and noise enhancement effect can be reduced on the reverse channels. The orthogonalized received signals are recovered through channel estimators (16), phase compensators (17), RAKE combiners (18) and decision blocks (19).

摘要翻译： 即使正交化的接收信号矢量的数量非常大，也能够进行有效的正交化的CDMA接收机。 通过扩展码扩展的接收信号通过解扩滤波器（11）进行解扩。 在互相关的预选择器（20）中比较接收信号电平和扩展码之间的互相关的乘积，并且按照数量级选择Ns乘积，其中Ns是预定的整数。 与所选择的产品相关联的Ns信号优先进行正交化。 可以有效地减少由解相关器（15）正交化的信号的数量，并且可以在反向信道上降低噪声增强效果。 通过信道估计器（16），相位补偿器（17），RAKE组合器（18）和判定块（19）来恢复正交化的接收信号。