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    • 3. 发明授权
    • Phase detecting circuit
    • 相位检测电路
    • US4803385A
    • 1989-02-07
    • US17625
    • 1987-02-24
    • Hizuru Nawata
    • Hizuru Nawata
    • H03K5/26G01R25/00H03L7/00H03L7/085
    • G01R25/00
    • A phase detecting circuit for detecting a phase differential between a reference clock and a bit timing extracted from a demodulated signal, which is derived from a modulation wave modulated by a digital signal. The circuit successfully eliminates points of discontinuity in the phase detection characteristic of a phase detector and, therefore, accurately determines a phase differential between the bit timing and the reference clock with no regard to the magnitude of the phase differential of an input. An absolute value averaging circuit is provided for averaging the absolute valves of a plurality of consecutive outputs of a phase detector. A sign majority decision circuit is provided for producing one of positive and negative signs of the consecutive outputs of the phase detector which is decided by majority. Further, a multiplier is provided for multiplying an output of the absolute value averaging circuit and an output of the majority decision circuit, the resulting product being delivered as a phase differential.
    • 一种相位检测电路,用于检测从由数字信号调制的调制波导出的解调信号提取的参考时钟和比特定时之间的相位差。 电路成功地消除了相位检测器的相位检测特性中的不连续点,因此,不考虑输入的相位差的大小,精确地确定位定时和参考时钟之间的相位差。 提供绝对值平均电路,用于对相位检测器的多个连续输出的绝对阀进行平均。 提供符号多数决定电路,用于产生由多数决定的相位检测器的连续输出的正和负符号之一。 此外,提供乘法器用于将绝对值平均电路的输出和多数判定电路的输出相乘,所得到的乘积被递送为相位差。
    • 4. 发明授权
    • Burst signal transmission from an earth station to an orbiting satellite
with a short guard time
    • 突发信号从地球站传输到具有短保护时间的轨道卫星
    • US5991598A
    • 1999-11-23
    • US907866
    • 1997-08-11
    • Hizuru Nawata
    • Hizuru Nawata
    • H04J3/00H04B7/185H04B7/204H04B7/212
    • H04B7/18532H04B7/2041H04B7/2125
    • Radiated from each orbiting satellite of a satellite communication network to M cells (M representing an integer, such as thirty-seven) covered with a predetermined solid angle on the earth, M spot beams are identified by M identification codes. In an earth station which may be a portable unit, a burst signal transmitter device (31) comprises a receiver part (35) receiving one of the spot beams as a received beam at a reception time, to recognize as a recognized code one of the identification codes that identifies the received beam, and a transmitter part (45) for transmitting burst signals at a transmission time delayed from the reception time by an offset amount selected by the recognized code from M offset amounts predetermined for the identification codes. Preferably, the M offset amounts are stored in a memory (43).
    • 从卫星通信网络的每个轨道卫星辐射到以地球上预定立体角覆盖的M个小区(M代表一个整数,例如三十七个),M个点波束由M个识别码识别。 在可以是便携式单元的地球站中,突发信号发射机装置(31)包括:接收部分(35),在接收时间接收作为接收波束的点波束中的一个,以识别为识别码 用于识别接收到的波束的识别码;以及发射机部分(45),用于在从接收时间延迟的传输时间处以由所识别的码所选择的偏移量从针对识别码预定的M个偏移量发送突发信号。 优选地,M个偏移量存储在存储器(43)中。
    • 5. 发明授权
    • Demodulator control system and a receiver capable of quickly acquiring a
desired carrier wave
    • 解调器控制系统和能够快速获取期望载波的接收机
    • US5708682A
    • 1998-01-13
    • US578861
    • 1995-12-27
    • Hizuru Nawata
    • Hizuru Nawata
    • H03J7/18H04B1/26H04B7/208H04J1/00H04L5/06H04L27/227H04L7/00H04L27/06
    • H04L5/06H04B7/208
    • In a control system being provided with a local oscillator (42) and being for controlling a demodulating arrangement (43, 44, and 45) demodulating a desired one of modulated signals in accordance with a demodulating frequency, produced by a sweeping operation of the local oscillator, into a demodulated signal having a unique word and an identification number which are carried by the desired modulated signal, a unique word detecting circuit (47) detects the unique word to produce a unique word detection signal. A number comparing circuit (48) compares the identification number with a desired one of predetermined numbers to produce a number coincidence signal when the identification number coincides with the desired number. In response to presence and absence of each of the number coincidence and the unique word detection signals, an oscillator control circuit (49) controls the sweeping operation of the local oscillator.
    • 在具有本地振荡器(42)并且用于控制解调装置(43,44和45)的控制系统中,根据解调频率来解调所调制的信号,所述调制信号通过本地 振荡器转换为具有由期望的调制信号携带的唯一字和识别号的解调信号,唯一字检测电路(47)检测唯一字以产生唯一字检测信号。 数字比较电路(48)将识别号码与期望的一个预定号码进行比较,以便当识别号码与期望号码一致时产生数字符合信号。 响应于存在和不存在数字一致性和唯一字检测信号,振荡器控制电路(49)控制本地振荡器的扫描操作。
    • 6. 发明授权
    • Communication system with repeatedly allocated channel ID numbers
    • 通信系统具有重复分配的频道ID号码
    • US5691983A
    • 1997-11-25
    • US657774
    • 1996-05-31
    • Hizuru Nawata
    • Hizuru Nawata
    • H04J1/00H04B7/208H04L5/06H04J1/02H04Q7/00
    • H04B7/208H04L5/06
    • An available frequency range previously assigned to the communication system is divided into a plurality of subranges each including a plurality of frequency channels to which channel identifiers are assigned, respectively. The channel identifiers are repeatedly assigned to all the frequency channels in the subranges. In such a channel assignment, a transmitting side transmits a signal including a desired channel identifier corresponding to a desired frequency channel. At a receiving side, after detecting a frequency acquisition of the demodulator, the desired channel identifier is detected based on the received signal when the frequency acquisition of the demodulator is detected. When the frequency acquisition of the demodulator is detected and the desired channel identifier is detected, a local oscillation frequency sweeping for demodulator is locked to receive the signal from the transmitting side.
    • 先前分配给通信系统的可用频率范围被分成多个子范围,每个子范围包括分配了信道标识符的多个频道。 频道标识符重复分配给子范围内的所有频道。 在这样的信道分配中,发送侧发送包括与期望的频率信道对应的期望信道标识符的信号。 在接收侧,在检测到解调器的频率获取之后,当检测到解调器的频率采集时,基于接收信号来检测所需的信道标识符。 当检测到解调器的频率采集并且检测到期望的信道标识符时,锁定用于解调器的本地振荡频率扫描以从发送侧接收信号。
    • 7. 发明授权
    • Communication system for varying timing offset to accommodate variation
in propagation delay
    • 用于改变定时偏移的通信系统,以适应传播延迟的变化
    • US5640672A
    • 1997-06-17
    • US455208
    • 1995-05-31
    • Hizuru Nawata
    • Hizuru Nawata
    • H04B7/195H04B7/212H04B7/185
    • H04B7/2125
    • In a communication system for transmitting and receiving burst signal between a round-trip satellite and a ground station, upon transmission of a transmitting burst signal from the round-trip satellite, a standard time upon transmission is added to the transmitting burst signal. In the ground station, the time data added to the transmitting burst data is extracted and compared with the standard time upon reception to derive a transmission delay period. A transmission timing of a burst signal to be transmitted from the own station is controlled depending upon the transmission delay period. By this, even when a distance between the ground station and the round-trip satellite is varied, overlapping of the burst signals in the time slots on the same time axis can be successfully avoided. Also, a guard time can be shortened to contribute for improvement of the transmission efficiency.
    • 在用于在往返卫星和地面站之间发送和接收脉冲串信号的通信系统中,在从往返卫星传输发射脉冲串信号时,将传输时的标准时间加到发射脉冲串信号上。 在地面站中,提取与发送脉冲串数据相加的时间数据,并与接收时的标准时间进行比较,得到传输延迟期间。 根据传输延迟周期来控制要从本台发送的突发信号的发送定时。 由此,即使在地面站与往返卫星之间的距离变化的情况下,也可以成功地避免同一时间轴上的时隙中的突发信号的重叠。 此外,可以缩短保护时间以有助于提高传输效率。
    • 8. 发明授权
    • Burst demodulator for establishing carrier and clock timing from a
sequence of alternating symbols
    • 突发解调器,用于从交替符号序列建立载波和时钟定时
    • US5170415A
    • 1992-12-08
    • US537354
    • 1990-06-13
    • Shousei YoshidaHizuru Nawata
    • Shousei YoshidaHizuru Nawata
    • H04L7/04H04L27/38
    • H04L27/3872H04L7/046
    • In a burst demodulator, an APSK burst signal containing a preamble of alternating "1" and "-1" symbols, followed by a data field is received and quasi-coherently demodualted into a baseband complex signal, which is converted to digital form such that each symbol of the complex signal yields N digital samples, with N being selected such that at least one of the N digital samples is closest to a signal point of the burst signal. A clock recovery circuit is responsive to the arrival of the burst for estimating the symbol timing of the burst signal from digital samples of the preamble. A digital sample is extracted from every N samples of the preamble in response to the estimated symbol timing so that it is most likely to be closest to the signal point. A carrier recovery circuit responds to the estimated symbol timing by estimating the carrier frequency and phase of the burst signal from the extracted digital samples to produce a complex carrier signal, which is multiplied with the extracted digital samples to recover the original signal. Memories are preferably provided to store the received burst signal. By repeatedly reading the preamble from the memories, the same symbols of the preamble can be used for clock timing and carrier phase recovery operations.
    • 在脉冲串解调器中,接收包含交替的“1”和“-1”符号的前导码的APSK突发信号,随后是数据字段,并被准相干解调成基带复合信号,其被转换成数字形式,使得 复信号的每个符号产生N个数字样本,其中N被选择为使得N个数字样本中的至少一个最接近于突发信号的信号点。 时钟恢复电路响应于用于从前同步码的数字样本估计突发信号的符号定时的脉冲串的到达。 响应于估计的符号定时,从前导码的每个N个样本中提取数字样本,使得其最可能最接近信号点。 载波恢复电路通过从提取的数字样本估计突发信号的载波频率和相位来产生复载波信号来响应估计的符号定时,该复载波信号与所提取的数字样本相乘以恢复原始信号。 优选地提供存储器以存储所接收的突发信号。 通过从存储器重复读取前同步码,可以将前置码的相同符号用于时钟定时和载波相位恢复操作。
    • 9. 发明申请
    • SERIAL SIGNAL TRANSMISSION SYSTEM
    • 串行信号传输系统
    • US20090036168A1
    • 2009-02-05
    • US11994669
    • 2006-08-01
    • Hizuru NawataShintaro SomaKoji HoshinaYuzo Yoneyama
    • Hizuru NawataShintaro SomaKoji HoshinaYuzo Yoneyama
    • H04W88/00
    • H04L1/0079H04L1/0068
    • A transmission device includes signal synthesizer 16 that replaces the least significant bits of a plurality of transmission and reception target data that are digital signals with bit data of a desired control signal that is a digital signal, and serial signal converter 17 that converts the output signal from the signal synthesizer into a serial signal and transmits the serial signal. On the other hand, a reception device includes parallel signal converter 21 that converts the received serial signal into a parallel signal to acquire transmission and reception target data, and signal separator 23 that extracts the bit data of the control signal from the respective least significant bits of transmission and reception target data output by parallel signal converter 21.
    • 发送装置包括:信号合成器16,其将作为数字信号的多个发送和接收目标数据中的最低有效位替换为作为数字信号的期望控制信号的位数据;以及串行信号转换器17,其将输出信号 从信号合成器进入串行信号并发送串行信号。 另一方面,接收装置包括并行信号转换器21,其将接收到的串行信号转换为并行信号以获取发送和接收目标数据;以及信号分离器23,其从相应的最低有效位提取控制信号的位数据 由并行信号转换器21输出的发送和接收目标数据。
    • 10. 发明申请
    • Vacancy information search system
    • 空缺信息搜索系统
    • US20050256855A1
    • 2005-11-17
    • US11110802
    • 2005-04-21
    • Shintaro SomaHizuru NawataKen Kasagi
    • Shintaro SomaHizuru NawataKen Kasagi
    • G06F17/30G06Q30/06G06Q50/00H04M3/42H04M11/00
    • G06Q10/02
    • A vacancy information search system includes a vacancy information storage unit, reserved business entity storage unit, priority setting unit, and search unit. the vacancy information storage unit stores business entity vacancy information. The reserved business entity storage unit stores the log of a business entity reserved by a user. The priority setting unit sets a priority given by the user for the reserved business entity stored in the reserved business entity storage unit. The search unit accesses the vacancy information storage unit in response to a request from the user and searches for vacancy information of the reserved business entity of the user, which is stored in the reserved business entity storage unit, in order of priorities set for the reserved business entity. A vacancy information search method is also disclosed
    • 空缺信息搜索系统包括空缺信息存储单元,预约业务实体存储单元,优先级设置单元和搜索单元。 空缺信息存储单元存储商业实体空缺信息。 保留业务实体存储单元存储用户保留的业务实体的日志。 优先级设置单元为存储在预约业务实体存储单元中的预留业务实体设置由用户给出的优先级。 搜索单元响应于来自用户的请求访问空缺信息存储单元,并且按照为预约设置的优先级顺序搜索存储在预约业务实体存储单元中的用户的预留业务实体的空白信息 商业实体。 还公开了空缺信息搜索方法