会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 22. 发明授权
    • Spread spectrum communication device
    • 扩频通信设备
    • US5291515A
    • 1994-03-01
    • US713462
    • 1991-06-11
    • Yoshitaka UchidaMamoru EndoMasahiro HamatsuShigeo Akazawa
    • Yoshitaka UchidaMamoru EndoMasahiro HamatsuShigeo Akazawa
    • H04B1/69H04B1/709H04J13/00H04L7/04H04L27/30
    • H04L7/043H04B1/69H04B1/709H04J13/0074
    • On the transmitter side, data to be transmitted are converted into a plurality of parallel data sets by a serial-parallel converter 101 and spread spectrum modulation is effected by means of PN code generators 105 and selectors 102. Each of the modulated outputs is delayed by a delaying circuit 103 with reference to a sounder channel and the phase thereof. The output thus delayed and the output of the sounder channel are added by an adder 104 to be multiplexed and transmitted.On the receiver side, correlation between a received signal and a reference signal is formed by a correlator 201 to obtain a correlation pulse from the correlation output thus obtained. Data demodulation is effected by means of a sounder detecting circuit 209, a sampling pulse generating circuit 210 and an information detecting circuit 211, starting from this correlation pulse.According to the structure described above, in SS communication, data demodulation can be effected with a high efficiency by using a single correlator.
    • 在发射机侧,由串并行转换器101将要发送的数据转换成多个并行数据集,并通过PN码发生器105和选择器102进行扩频调制。每个调制输出被延迟 参考发声器通道的延迟电路103及其相位。 输出如此延迟,并且发声器通道的输出由加法器104相加以进行复用和发送。 在接收机侧,由相关器201形成接收信号与参考信号之间的相关,以从这样获得的相关输出中获得相关脉冲。 通过发声器检测电路209,采样脉冲发生电路210和信息检测电路211,从该相关脉冲开始进行数据解调。 根据上述结构,在SS通信中,可以通过使用单个相关器以高效率进行数据解调。
    • 28. 发明授权
    • Spread spectrum communication system
    • 扩频通信系统
    • US06366603B1
    • 2002-04-02
    • US09120842
    • 1998-07-23
    • Yoshitaka UchidaTakeshi HashimotoKatsuo Onozaki
    • Yoshitaka UchidaTakeshi HashimotoKatsuo Onozaki
    • H04B1500
    • H04B1/70755H04B1/709
    • A spread spectrum communication system including a transmission side for transmitting a frame-structured transmission signal containing at least one preamble (having information on a transmission destination) and data subsequent to the preamble(s) while spread-spectrum-modulating the transmission signal with a PN code, and a reception side having a correlator for performing correlation between the PN code of the transmission signal and a reference PN code and a PN code generator for generating the reference PN code. At the reception side, the PN code of the preamble of the transmission signal and the reference PN code are correlated with each other to obtain correlation peaks, and the periodicity of the correlation peaks is detected and a prescribed number of correlation peaks is counted, thereby identifying the transmission signal as being addressed to the receiver.
    • 一种扩展频谱通信系统,包括发送侧,用于发送包含至少一个前导码(具有关于发送目的地的信息)的帧结构的发送信号以及在前导码之后的数据,同时对发送信号进行扩频调制, PN码,以及具有用于执行发送信号的PN码与参考PN码之间的相关性的相关器的接收端和用于产生参考PN码的PN码发生器。 在接收侧,将发送信号的前同步码的PN码和基准PN码相互关联,得到相关峰值,并且检测相关峰值的周期,并对规定数量的相关峰值进行计数,从而 将发送信号识别为寻址到接收机。
    • 30. 发明授权
    • Sliding correlator
    • 滑动相关器
    • US5574754A
    • 1996-11-12
    • US556439
    • 1995-11-09
    • Takao KuriharaYoshitaka UchidaMasahiro Hamatsu
    • Takao KuriharaYoshitaka UchidaMasahiro Hamatsu
    • H04J13/00H04B1/7095H04L7/04H04L7/00
    • H04B1/7075H04B1/708H04B1/7085H04B1/7095H04L7/043
    • A sliding correlator for initial synchronization and tracking of a SS (Spread Spectrum)-modulated signal containing a transmitted pseudo noise (PN) code, digitizes the received signal, and attempts to correlate the PN code in the received signal with a locally generated reference PN code. Initial synchronization employs correlation with three reference PN codes, an early, center and late channel. When correlation is found between the transmitted PN code and one of the reference PN codes, the three reference PN codes are shifted to align the center channel with the correlated channel and to displace the early and late channel reference PN codes to one side and the other of the center channel. In one embodiment, the displacement is one-third chip, and in another embodiment, the displacement is one-half chip. In one embodiment for initial tracking, the three channels are displaced one chip from each other and, after failure to attain correlation in any of the channels, the three channels are displaced three chips to again seek synchronization. Initial Tracking, following initial synchronization, detects changes in correlation in the three channels, and adjust the frequency and/or the phase of the three reference PN codes to return the reference PN codes into a desired relationship with the transmitted PN code. In one embodiment of tracking, clockwise and counterclockwise cyclic permutation of the three reference PN codes is used to maintain alignment between the three reference PN codes and the transmitted PN code. In other embodiments, the condition of correlation, or lack thereof, in each channel is stored in a register and shifting of the reference PN codes is performed in response to the status of the register.
    • 用于初始同步和跟踪包含发射伪噪声(PN)码的SS(扩频))调制信号的滑动相关器对接收到的信号进行数字化,并尝试将接收信号中的PN码与本地生成的参考PN 码。 初始同步采用与三个参考PN码(早期,中心和晚期信道)的相关性。 当在所发送的PN码和参考PN码之一中发现相关时,三个参考PN码被移位以使中心信道与相关信道对准,并将早期和晚期信道参考PN码移位到一侧,而另一个 的中心渠道。 在一个实施例中,位移是三分之一芯片,在另一个实施例中,位移是二分之一芯片。 在初始跟踪的一个实施例中,三个信道彼此一个位移,并且在不能在任何信道中获得相关性之后,三个信道被移位三个码片以再次寻找同步。 初始跟踪在初始同步之后,检​​测三个通道中相关性的变化,并调整三个参考PN代码的频率和/或相位,以将参考PN代码返回到与发送的PN码的期望关系。 在跟踪的一个实施例中,使用三个参考PN码的顺时针和逆时针循环置换来保持三个参考PN码和所发送的PN码之间的对准。 在其他实施例中,每个信道中的相关条件或不存在的条件存储在寄存器中,并且响应于寄存器的状态执行参考PN码的移位。