专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US5774494A Frequency error correction device of a spread-spectrum communication receiver 失效
标题翻译：扩频通信接收机的频率误差校正装置
公开(公告)号：US5774494A
公开(公告)日：1998-06-30
申请号：US342349
申请日：1994-11-18
申请人： Mamoru Sawahashi , Tomohiro Dohi
发明人： Mamoru Sawahashi , Tomohiro Dohi
IPC分类号： H04B1/707 , H04B1/7087 , H04J13/00 , H04B15/00
CPC分类号： H04B1/707
摘要： A frequency correction device for a spread-spectrum communication receiver requiring no high-accuracy, high-stable VCO as a local signal oscillator. It includes a quasi-coherent quadrature detector detecting an intermediate frequency signal using a local signal from a fixed frequency local oscillator, a correlation detector producing a despread signal by demodulating the output of the detector, a clock signal generating portion generating a pair of clock signals whose frequency is deviated a little with respect to a clock signal for driving the correlation detector. The pair of clock signals are used to drive two correlation detectors, and the amplitude of the outputs of the correlation detectors are squared, and then subtracted, thereby generating a correlation output error signal. Since the correlation output error signal has one to one correspondence with the frequency difference between the chip frequency of the spread spectrum signal outputted from the quasi-coherent quadrature detector and the frequency of the clock signal, a frequency correction signal can be generated by converting the correlation output error signal into the frequency error. The frequency difference between despread signal and the clock signal, which arises from the difference between the center frequency of a received signal and the local signal, can be corrected by correcting the frequency of the despread signal by the frequency correction signal.
摘要翻译：用于扩频通信接收机的频率校正装置，不需要高精度，高稳定的VCO作为本地信号振荡器。它包括使用来自固定频率本地振荡器的本地信号检测中频信号的准相干正交检测器，相关检测器，通过解调检测器的输出产生解扩信号;时钟信号产生部分，产生一对时钟信号其频率相对于用于驱动相关检测器的时钟信号偏离一点。该对时钟信号用于驱动两个相关检测器，相关检测器的输出的幅度平方，然后减去，从而产生相关输出误差信号。由于相关输出误差信号与从准相干正交检波器输出的扩频信号的码片频率与时钟信号的频率之间的频率差一一对应，所以可以通过转换频率校正信号相关输出误差信号进入频率误差。由接收信号的中心频率与本地信号之间的差异产生的解扩信号与时钟信号之间的频差可以通过频率校正信号校正解扩信号的频率来进行校正。

2. 发明授权

US5715235A Communication system capable of performing FDMA transmission 失效
标题翻译：能够执行FDMA传输的通信系统
公开(公告)号：US5715235A
公开(公告)日：1998-02-03
申请号：US342582
申请日：1994-11-21
申请人： Mamoru Sawahashi , Tomohiro Dohi , Fumiyuki Adachi
发明人： Mamoru Sawahashi , Tomohiro Dohi , Fumiyuki Adachi
IPC分类号： H04B1/28 , H04B1/707 , H04B17/00 , H04J11/00 , H04B7/208
CPC分类号： H04B1/0007 , H04B1/0003 , H04B1/7093 , H04B17/318 , H04B1/28
摘要： A communication apparatus is disclosed which is capable of measuring levels of carrier signals used in adjacent zones during telecommunication with a small circuit scale, and capable of simultaneously transmitting/receiving to FDMA-system signals through a plurality of communication channels. All of transmission signals received through the communication channels under use are wholly converted into an intermediate signal by a mixer. The intermediate signal is quadrature-detected and then A/D-converted into digital I/Q-channel signals by A/D-converters. Thereafter, the digital I/Q-channel signals are frequency-converted by frequency converting circuits in such a manner that center frequencies of these I/Q-channel signals become zero, two sets of I/Q-channel signals may be demodulated by two sets of demodulating circuits. Otherwise, one of these I/Q-channel signals is demodulated by a single demodulating circuit, and the other is level-detected by a level detecting circuit.
摘要翻译：公开了一种通信装置，其能够以小电路规模测量在通信期间在相邻区域中使用的载波信号的电平，并且能够通过多个通信信道同时发送/接收FDMA系统信号。通过正在使用的通信信道接收到的所有传输信号通过混频器完全转换成中间信号。中间信号被正交检测，然后通过A / D转换器A / D转换成数字I / Q通道信号。此后，数字I / Q信道信号通过频率转换电路以这些I / Q信道信号的中心频率变为零的方式进行频率转换，两组I / Q信道信号可以由两个解调电路组。否则，这些I / Q信道信号之一由单个解调电路解调，另一个由电平检测电路进行电平检测。

3. 发明授权

US5623486A Transmission power control method and apparatus for mobile communications using a CDMA (code division multiple access) system 失效
标题翻译：使用CDMA（码分多址）系统的移动通信的发送功率控制方法和装置
公开(公告)号：US5623486A
公开(公告)日：1997-04-22
申请号：US442955
申请日：1995-05-17
申请人： Tomohiro Dohi , Mamoru Sawahashi , Koji Ohno
发明人： Tomohiro Dohi , Mamoru Sawahashi , Koji Ohno
IPC分类号： H04W52/04 , H04B7/005 , H04B7/26 , H04J13/00 , H04L1/00 , H04W52/00 , H04W52/02 , H04W52/08
CPC分类号： H04L1/0054 , H04L1/0072 , H04W52/0245 , H04W52/08
摘要： A transmission power control method is disclosed for controlling transmission power of radio communications in a CDMA system. The transmission power of a first transmitted signal transmitted from a first station is determined by a transmission power control signal contained in a second transmitted signal sent from a second station. The first station receives the second transmitted signal in the form of convolutional codes, and decodes it by using a first Viterbi decoder and a second Viterbi decoder. The first and second Viterbi decoders includes path memories with the path history length of different first predetermined lengths. The transmission power control signal contained in the second transmitted signal is extracted from the output of the second Viterbi decoder, whereas the other information data is obtained from the output of the first Viterbi decoder. The first station controls the transmission power of the first transmitted signal on the basis of the extracted transmission power control signal.
摘要翻译：公开了用于控制CDMA系统中的无线电通信的发送功率的发送功率控制方法。从第一站发送的第一发送信号的发送功率由包含在从第二站发送的第二发送信号中的发送功率控制信号确定。第一站以卷积码的形式接收第二发送信号，并通过使用第一维特比解码器和第二维特比解码器进行解码。第一和第二维特比解码器包括具有不同的第一预定长度的路径历史长度的路径存储器。从第二维特比解码器的输出中提取包含在第二发送信号中的发送功率控制信号，而从第一维特比解码器的输出获得其他信息数据。第一站基于所提取的发送功率控制信号来控制第一发送信号的发送功率。

4. 发明授权

US5638362A Correlation detector and communication apparatus 失效
标题翻译：相关检测器和通讯装置
公开(公告)号：US5638362A
公开(公告)日：1997-06-10
申请号：US481396
申请日：1995-06-13
申请人： Tomohiro Dohi , Mamoru Sawahashi , Fumiyuki Adachi
发明人： Tomohiro Dohi , Mamoru Sawahashi , Fumiyuki Adachi
IPC分类号： H04B1/707 , H04B7/212 , H04J13/00
CPC分类号： H04B1/7085 , H04B7/2125
摘要： A correlation detector is provided which can establish initial acquisition quickly, and achieve high accuracy tracking by extracting crosscorrelation components in a receiver for CDMA communication, and a communication system using the correlation detector is also provided. During the initial acquisition, a received signal 21 is supplied to a matched filter 43. When an acquisition decision circuit 45 decides that the matched filter 43 detects the acquisition, it controls a switching circuit 42 to supply the received signal 21 to multipliers 47 and 48, and resets a VCCG 29 and a spreading code replica generator 30. After establishing the acquisition, a received spreading code is quasicoherent detected, and the detected spread signal is multiplied by a phase advanced replica and a phase retarded replica. Correlation detection signals are produced from the products, and squared components of the correlation detected signals are generated, summed in the opposite phase, and averaged along the time axis. The averaged signal is inversely modulated by a decision signal of received data to obtain a phase error signal, the decision signal being obtained by multiplying the received spread signal by a replica in synchronism with the received spread sinal, and by integrating the product over a plurality of chips to compensate for a receive phase error. The replica generator is driven by a clock signal whose phase is controlled by the phase error signal.
摘要翻译： PCT No.PCT / JP94 / 01715 Sec。 371日期：1995年6月13日 102（e）1995年6月13日PCT 1994年10月13日PCT PCT。公开号WO95 / 10903 日期1995年04月20日提供了一种能够快速建立初始采集并通过提取用于CDMA通信的接收机中的互相关分量来实现高精度跟踪的相关检测器，并且还提供了使用该相关检测器的通信系统。在初始采集期间，将接收信号21提供给匹配滤波器43.当采集判定电路45判定匹配滤波器43检测到采集时，控制切换电路42将接收信号21提供给乘法器47和48 ，并且复位VCCG 29和扩展码副本发生器30.在建立采集之后，接收的扩展码被准相干检测，并且所检测的扩展信号乘以相位超前副本和相位延迟副本。产生相关检测信号，产生相关检测信号的平方分量，相反相加，并沿时间轴平均。平均信号由接收数据的判定信号反相调制以获得相位误差信号，该判决信号是通过将接收到的扩展信号与接收到的扩展信号同步地复制一个副本而获得的，并且通过多个的芯片来补偿接收相位误差。复制发生器由相位由相位误差信号控制的时钟信号驱动。

5. 发明授权

US5604766A Transmission power control method of a spread-spectrum communication system, and a spread-spectrum communication system employing the control method 失效
标题翻译：扩频通信系统的发送功率控制方法以及采用该控制方法的扩频通信系统
公开(公告)号：US5604766A
公开(公告)日：1997-02-18
申请号：US439503
申请日：1995-05-11
申请人： Tomohiro Dohi , Mamoru Sawahashi , Fumiyuki Adachi
发明人： Tomohiro Dohi , Mamoru Sawahashi , Fumiyuki Adachi
IPC分类号： H04W52/04 , H04B7/005 , H04B7/26 , H04J13/00 , H04W52/36 , H04W52/54 , H04L27/30
CPC分类号： H04W52/221 , H04W52/362 , H04W52/367
摘要： A transmission power control method of a spread-spectrum communication system which determines transmission power in accordance with a transmission power control bit. The transmission power control bit is extracted at a base station from a signal sequence obtained by receiving a signal transmitted from a mobile station, and by despreading and demodulating the received signal. When the same value of the transmission power control bit is consecutively received, the transmission power of the base station is controlled in accordance with transmission power control quantities which are predetermined in accordance with the consecutive number of receptions of the same value of the transmission power control bit. This is because the consecutive receptions of the same value of the transmission power control bit suggests that the received power of the other party (the mobile station in this case) changes greatly. Thus, an amount of an increment or a decrement in the transmission power is increased with the duration of the consecutive receptions. This makes it possible for the transmission power control to follow sudden changes in propagation paths.
摘要翻译：扩展频谱通信系统的发送功率控制方法，其根据发送功率控制比特确定发送功率。发送功率控制位是从基站接收从移动台发送的信号而得到的信号序列，并对接收到的信号进行解扩解调而从基站提取的。当连续接收到发送功率控制位的相同值时，根据与发送功率控制的相同值的连续接收次数预定的发送功率控制量来控制基站的发送功率位。这是因为发送功率控制位的相同值的连续接收表明对方（在这种情况下为移动台）的接收功率发生很大变化。因此，随着连续接收的持续时间，发送功率的增量或减量的量增加。这使得传输功率控制可以跟随传播路径的突然变化。

6. 发明授权

US5594754A Spread spectrum communication receiver 失效
标题翻译：扩频通信接收机
公开(公告)号：US5594754A
公开(公告)日：1997-01-14
申请号：US448396
申请日：1995-06-06
申请人： Tomohiro Dohi , Mamoru Sawahashi , Fumiyuki Adachi
发明人： Tomohiro Dohi , Mamoru Sawahashi , Fumiyuki Adachi
IPC分类号： H04B1/707 , H04B1/7087 , H04J13/00 , H04B15/00 , H04K1/00 , H04L27/30
CPC分类号： H04B1/7097 , H04B1/7117
摘要： A spread spectrum communication receiver which can obviate a highly accurate, highly stable VCO used in a local signal oscillator. The receiver includes a corrector for correcting by a correcting signal a baseband signal obtained by spectrum despreading; a RAKE circuit for recovering information by demodulating corrected baseband signal; a remodulator for remodulating the demodulated signal outputted from the RAKE circuit, thereby generating a signal corresponding to a primary modulated signal at a transmitter; a multiplier for multiplying the baseband signal by the complex conjugate of the output of the remodulator; an averaging circuit for averaging the output of the multiplier to eliminate noise components of the baseband signal, thereby outputting only frequency offset component of the received signal and the local signal; and a circuit for producing a correcting signal with an angular velocity obtained from said frequency offset component and a polarity opposite to that of the baseband signal, thereby eliminating the frequency offset component by the corrector.
摘要翻译： PCT No.PCT / JP94 / 01701 Sec。 371日期：1995年6月6日 102（e）日期1995年6月6日PCT 1994年10月12日PCT PCT。公开号WO95 / 10891 日期1995年04月20日一种扩频通信接收机，可以消除本地信号振荡器中使用的高精度，高度稳定的VCO。接收机包括校正器，用于通过校正信号校正通过频谱解扩获得的基带信号; RAKE电路，用于通过解调校正的基带信号来恢复信息; 再调制器，用于重新调制从RAKE电路输出的解调信号，从而在发射机处产生对应于一次调制信号的信号; 用于将基带信号乘以再调制器的输出的复共轭的乘法器; 平均电路，用于平均所述乘法器的输出以消除所述基带信号的噪声分量，从而仅输出所述接收信号和所述本地信号的频率偏移分量; 以及用于产生从所述频率偏移分量获得的具有角速度的校正信号和与基带信号的极性相反的极性的校正信号的电路，从而消除了校正器的频率偏移分量。

7. 发明授权

US5586113A CDMA communications method and system 失效
标题翻译： CDMA通信方式和系统
公开(公告)号：US5586113A
公开(公告)日：1996-12-17
申请号：US335089
申请日：1994-11-07
申请人： Fumiyuki Adachi , Mamoru Sawahashi , Tomohiro Dohi , Shinji Uebayashi
发明人： Fumiyuki Adachi , Mamoru Sawahashi , Tomohiro Dohi , Shinji Uebayashi
IPC分类号： H04W76/02 , H04B7/26 , H04J13/00 , H04W76/00
CPC分类号： H04B7/264
摘要： A CDMA communications method capable of multiplex transmission of data over a wide range from a low rate to high rate such as image data without a considerable increase in a circuit scale. A fundamental transmission rate is determined, for example, at 32 kbps, a rate higher than 8 kbps conventionally used. The data whose transmission rate is equal to the fundamental transmission rate is transmitted in frames including no vacant portion. Data whose transmission rate is lower than the fundamental transmission rate (16 kbps, for example) is transmitted in frames including vacant portions. The vacant portions are not transmitted. This makes it possible to receive data through other channels during a time period associated with the vacant portions. Data of a higher transmission rate, 128 kbps, for example, can be multiplexed and transmitted through four channels using different spreading codes.
摘要翻译：一种CDMA通信方法，其能够在诸如图像数据的低速率到高速率的宽范围内多路传输数据，而不会显着增加电路规模。确定基本传输速率，例如以32kbps，高于常规使用的8kbps的速率。传输速率等于基本传输速率的数据以包括空格部分在内的帧发送。传输速率低于基本传输速率（例如16kbps）的数据在包括空白部分的帧中传输。空的部分不被传送。这使得可以在与空闲部分相关联的时间段期间通过其他信道接收数据。例如，128kbps的较高传输速率的数据可以通过使用不同扩展码的四个信道进行复用和传输。

8. 发明授权

US6034952A Method and instrument for measuring receiving SIR and transmission power controller 失效
标题翻译：测量接收SIR和传输功率控制器的方法和仪器
公开(公告)号：US6034952A
公开(公告)日：2000-03-07
申请号：US983412
申请日：1997-12-12
申请人： Tomohiro Dohi , Syunsuke Seo , Yukihiko Okumura , Mamoru Sawahashi , Fumiyuki Adachi
发明人： Tomohiro Dohi , Syunsuke Seo , Yukihiko Okumura , Mamoru Sawahashi , Fumiyuki Adachi
IPC分类号： H04B7/005 , H04J13/00
CPC分类号： H04W52/241 , H04B17/336
摘要： An SIR measuring apparatus with a simple configuration capable of improving the accuracy of received SIR measurement in CDMA mobile radio equipment using pilot symbols. A received signal (20) is input to a synchronization detector (21) that regenerates the clock timing of symbols and frame timing equivalent to the repetition period of the pilot signal. An interpolating coherent detector (22) produces information symbols (23) obtained from the received signal (20) through absolute phase coherent detection. A decision signal power calculator (24) obtains desired wave power values. A quasi-interference power calculator (25) obtains differences between the power values of the information symbols and a fading envelope, and adopts the differences as the quasi-interference power. Integrators (26 and 27) integrate received desired wave power and quasi-interference wave power. An SIR measuring portion (28) divides an averaged received desired wave power integral by an averaged quasi-interference power integral to obtain the received SIR (29).
摘要翻译： PCT No.PCT / JP97 / 01289第 371日期1997年12月12日 102（e）日期1997年12月12日PCT提交1997年4月14日PCT公布。第WO97 / 39545号公报日期1997年10月23日具有能够提高使用导频符号的CDMA移动无线电设备中的接收SIR测量精度的简单配置的SIR测量装置。接收信号（20）被输入到同步检测器（21），该同步检测器重新产生与导频信号的重复周期相当的符号的时钟定时和帧定时。内插相干检测器（22）通过绝对相位相干检测产生从接收信号（20）获得的信息符号（23）。决定信号功率计算器（24）获得期望的波功率值。准干扰功率计算器（25）获得信息符号的功率值和衰落包络之间的差异，并将该差作为准干扰功率。积分器（26和27）集成了所需的波功率和准干扰波功率。 SIR测量部分（28）将平均的接收期望波功率积分除以平均准干扰功率积分以获得接收SIR（29）。

9. 发明授权

US5684832A Maximum likelihood differential detecting method and differential detector thereof 失效
标题翻译：最大似然差分检测方法及其差分检测器
公开(公告)号：US5684832A
公开(公告)日：1997-11-04
申请号：US374784
申请日：1995-01-30
申请人： Fumiyuki Adachi , Mamoru Sawahashi , Tomohiro Dohi
发明人： Fumiyuki Adachi , Mamoru Sawahashi , Tomohiro Dohi
IPC分类号： H03M13/41 , H04L25/03 , H04L27/233 , H04L5/12 , H04L23/02
CPC分类号： H03M13/6502 , H03M13/3961 , H03M13/41 , H03M13/4169 , H04L25/03184 , H04L27/2332 , H04L2025/03401
摘要： The phase of a received signal is detected by a phase detector at symbol intervals T relative to the phase of a local signal. The detected phase is input to delay circuits that are connected in series and each of which has the delay interval T. Phases .PSI..sub.n (where n=0, 1, . . . , N) with delays of 1 to N symbols are output to a metric calculating portion. The sum of a partial sequence {.DELTA..phi..sub.i ; i=n+1-q, n+2-q, . . . , n} of a N-symbol phase difference sequence candidate {.DELTA..phi..sub.n ; n=0, 1, . . . , N} is added to a detected phase .PSI..sub.n-q at a time point (n-q)T (where q=1, 2, . . . , N) so as to obtain an estimated value of the received signal phase .PSI..sub.n. The v-th power value of the absolute value of a difference .mu..sub.n (q) between the estimated value and the received signal phase is defined as a branch metric of q-symbol differential phase detection. .SIGMA..vertline..mu..sub.n (q).vertline..sup.v =.lambda..sub.n, which the summation of metrics from q=1 to n, is defined as a branch metric at the time point nT. A path metric .LAMBDA.=.SIGMA..lambda..sub.n, which is the summation of branch metrics from a time point 1T to a time point NT, is calculated for all N-symbol phase difference candidates. A candidate sequence with a minimum value is decided as a decoded sequence.
摘要翻译： PCT No.PCT / JP94 / 00890 Sec。 371日期1995年1月30日 102（e）1995年1月30日PCT PCT 1994年6月2日PCT公布。公开号WO94 / 29990 日期1994年12月22日接收信号的相位由相位检测器以相对于本地信号的相位的符号间隔T来检测。所检测的相位被输入到串联连接的延迟电路，并且每个延迟电路具有延迟间隔T.具有1到N个符号的延迟的相位PSI n（其中n = 0,1，...，N）被输出到度量计算部分。部分序列{DELTA phi i; i = n + 1-q，n + 2-q，... 。。，n}个N符号相位差序列候选{DELTA phi; n = 0,1，... 。。，N}在时间点（n-q）T（其中q = 1,2，...，N）被添加到检测相位PSI n-q，以便获得接收信号相位PSI n的估计值。将估计值与接收信号相位之间的差值mu n（q）的绝对值的第v个功率值定义为q-符号差分相位检测的分支度量。 SIGMA | mu n（q）| v =λn，其中从q = 1到n的度量的求和被定义为在时间点nT的分支度量。对于所有N个符号相位差候选，计算路径量度LAMBDA = SIGMA lambda n，它是从时间点1T到时间点NT的分支度量的总和。具有最小值的候选序列被确定为解码序列。

10. 发明授权

US06341224B1 Power controller for mobile communication system wherein a signal to interference threshold is dynamically moved based on an error rate measurement 失效
标题翻译：用于移动通信系统的功率控制器，其中基于错误率测量动态地移动信号与干扰阈值
公开(公告)号：US06341224B1
公开(公告)日：2002-01-22
申请号：US09029534
申请日：1998-02-27
申请人： Tomohiro Dohi , Syunsuke Seo , Yukihiko Okumura , Mamoru Sawahashi
发明人： Tomohiro Dohi , Syunsuke Seo , Yukihiko Okumura , Mamoru Sawahashi
IPC分类号： H04B100
CPC分类号： H04W52/12 , H04L1/0001 , H04L1/002 , H04L1/203 , H04W52/08 , H04W52/18 , H04W52/20 , H04W52/225 , H04W52/24
摘要： An error rate of received signal is measured by a received signal error measuring unit 32, and a target SIR is changed by a target SIR decision unit using the error rate. It is also possible to detect error rate of received signal in an unit of frame using a CRC signal of a frame. It is further possible to detect error rate of received signal by detecting errors of known pilot signals inserted in a constant interval.
摘要翻译：接收信号的误差率由接收信号误差测量单元32测量，并且目标SIR由目标SIR判定单元使用错误率改变。也可以使用帧的CRC信号来检测以帧为单位的接收信号的错误率。还可以通过检测以恒定间隔插入的已知导频信号的误差来检测接收信号的错误率。

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