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    • 3. 发明授权
    • Apparatus and method for measuring SIR in CDMA communication system
    • CDMA通信系统测量SIR的装置和方法
    • US07085311B2
    • 2006-08-01
    • US10199013
    • 2002-07-22
    • Motoya Iwasaki
    • Motoya Iwasaki
    • H04B1/707
    • H04B17/336H04B1/7117H04W52/24
    • The present invention includes path delay difference comparator 14 for receiving path delay amounts τ1 to τK detected from a reception signal and extracting each pair of paths satisfying first condition (|τ1−τj|≦τth), de-spreaders 111 to 11K for performing de-spreading according to the path delay amounts, estimator 121 to 12K for estimating an SIR value every path, estimators 131 to 13K for estimating the carrier phase every path, phase difference comparator 15 for comparing the carrier phases θ1 to θk of the paths of each pair satisfying the first condition and extracting each pair of paths satisfying second condition (|θ1−θj|≦θth), and comparator 16 for selecting one path having larger SIR from the paths of each pair extracted and using the SIR value of the selected path for SIR combining.
    • 本发明包括路径延迟差比较器14,用于接收从接收信号检测到的路径延迟量τ1到T k,并提取满足第一条件的每对路径(|τ 用于根据路径延迟量执行去扩展的解扩器11 1至11 K, 用于估计每个路径的SIR值的估计器12 1至12 K,用于估计每个路径的SIR值,估计器13 1至13 K 每个路径的载波相位,相位差比较器15,用于将载波相位θ1与满足第一条件的每对路径的波形进行比较,并提取满足第二条件的每对路径(|θ1 - | = = ttt);以及比较器16,用于从提取的每对的路径中选择具有较大SIR的一个路径,并使用所选路径的SIR值进行SIR组合。
    • 5. 发明授权
    • Frequency estimating system
    • 频率估算系统
    • US06232761B1
    • 2001-05-15
    • US09405008
    • 1999-09-27
    • Motoya Iwasaki
    • Motoya Iwasaki
    • G01R23165
    • H04L27/2276
    • An inverse modulator 21, a Fourier transform circuit 22 and a power converter 23 are provided for obtaining a power-frequency spectrum of the carrier wave of a received signal, which is subjected to the influence of fading in the transmission line. A peak detector obtains a peak power level from the power-frequency spectrum and also obtains a peak power level frequency corresponding to the peak power level. A first and a second lower power level frequency detector 25 and 26 receive the power-frequency spectrum, the peak power level and the peak power level frequency. The first lower power level frequency detector detects a frequency which is higher than the peak power level frequency and corresponds to a power level lower than the peak power level by 120 dB, as a first lower power level frequency. The second lower power level frequency detector detects a frequency, which is lower than the peak power level frequency and corresponds to a power level lower than the peak power level by 10 dB, as a second lower power level frequency. An averaging circuit 27 obtains an estimated center frequency of the carrier wave by averaging the first and second lower power level frequencies.
    • 提供逆调制器21,傅立叶变换电路22和功率转换器23,用于获得经受传输线中的衰落影响的接收信号的载波的功率频谱。 峰值检测器从功率频谱获得峰值功率电平,并且还获得对应于峰值功率电平的峰值功率电平频率。 第一和第二低功率电平频率检测器25和26接收功率频谱,峰值功率电平和峰值功率电平频率。 第一低功率电平频率检测器检测到比峰值功率电平频率高的频率,并且对应于低于峰值功率电平120dB的功率电平作为第一较低功率电平频率。 第二低功率电平频率检测器检测低于峰值功率电平频率的频率,并且对应于低于峰值功率电平10dB的功率电平作为第二较低功率电平频率。 平均电路27通过平均第一和第二较低功率电平频率来获得载波的估计中心频率。
    • 6. 发明授权
    • Method and apparatus for preamble-less demodulation
    • 无前导码解调的方法和装置
    • US6016329A
    • 2000-01-18
    • US919820
    • 1997-08-29
    • Motoya Iwasaki
    • Motoya Iwasaki
    • H04L27/00H04L27/233H03D1/00H04J3/12H04L27/10
    • H04L27/2332H04L2027/003H04L2027/0095
    • A method and apparatus for demodulating includes differential-detecting an input signal into which a unique word is inserted, correlating an output of the differential-detection and a data table obtained by differential-detecting the unique word, detecting a time when an electric power of a correlation output which exceeds a threshold value becomes the local maximum, reading the input signal stored in a buffer from the leading end of the unique word, estimating a frequency error of the input signal based on a phase of the correlation output, obtaining a signal by removing the frequency error from the read signal and inverse-modulating a unique word portion in the signal in which the frequency error has been removed, according to a data of a unique word table, and then reproducing a carrier signal.
    • 一种用于解调的方法和装置包括差分检测输入信号,其中插入唯一字,将差分检测的输出与通过差分检测唯一字获得的数据表进行相关,检测时间, 超过阈值的相关输出变为局部最大值,从唯一字的前端读取存储在缓冲器中的输入信号,基于相关输出的相位估计输入信号的频率误差,获得信号 通过从读取信号中去除频率误差,并根据唯一字表的数据对已经去除了频率误差的信号中的唯一字部分进行逆调制,然后再现载波信号。
    • 7. 发明授权
    • Automatic frequency control apparatus and method therefor
    • 自动变频调速装置及其方法
    • US5500878A
    • 1996-03-19
    • US255367
    • 1994-06-08
    • Motoya Iwasaki
    • Motoya Iwasaki
    • H03J7/02H03D3/00H03J7/26H04B7/212H04L27/38H03J7/00H04L7/04H04L27/06
    • H03J7/26H03D3/007
    • An automatic frequency control apparatus includes a local oscillator, a quadrature detector, a frequency offset value estimation circuit, a demodulation circuit, a synchronization determination circuit, a memory, and an AFC circuit. The synchronization determination circuit determines reception synchronization on the basis of demodulated signals from the demodulation circuit to output a synchronization determination signal to the AFC circuit when reception synchronization is established and outputs the value to the AFC circuit. The apparatus also includes a power-on state detection circuit for outputting a detection signal to the AFC circuit. The AFC circuit determines the oscillation frequency of the local oscillator on the basis of the outputs from the above components. An automatic frequency control method is also disclosed.
    • 一种自动频率控制装置,包括本地振荡器,正交检波器,频率偏移值估计电路,解调电路,同步确定电路,存储器和AFC电路。 当建立接收同步时,同步确定电路基于来自解调电路的解调信号确定接收同步,向AFC电路输出同步确定信号,并将该值输出到AFC电路。 该装置还包括用于向AFC电路输出检测信号的通电状态检测电路。 AFC电路基于上述组件的输出确定本地振荡器的振荡频率。 还公开了一种自动频率控制方法。
    • 8. 发明授权
    • Spread packet communication system
    • 扩展分组通信系统
    • US5245612A
    • 1993-09-14
    • US643793
    • 1991-01-22
    • Seiji KachiSusumu OtaniMotoya IwasakiShoji EndoShinichi Kono
    • Seiji KachiSusumu OtaniMotoya IwasakiShoji EndoShinichi Kono
    • H04B7/216
    • H04B7/216
    • A satellite packet communication system comprising a central station and VSAT stations. The central station generates chip-rate clock pulses and transmits a series of data on timeslots of a frame to a satellite transponder, and a plurality of terminal stations. Each VSAT station receives the frame from the transponder and recovers the chip-rate clock pulses from the received frame. A pseudorandom number (PN) sequence generator, provided in the terminal station is synchronized with the recovered chip-rate clock pulses for generating bits of a PN sequence with which packetized data bits are pseudorandomly modulated and transmitted in burst form to the transponder. The central station includes a correlator which is synchronized with the central station's chip-rate clock pulses to detect correlations between the pseudorandomly modulated data bits a sequence of pseudorandom numbers corresponding to the PN sequence bits of the terminal stations.
    • 一种包括中心站和VSAT站的卫星分组通信系统。 中心站产生码片速率时钟脉冲,并将一帧数据发送到卫星转发器和多个终端站。 每个VSAT站从应答器接收帧并从接收帧恢复码片速率时钟脉冲。 在终端站中提供的伪随机数(PN)序列发生器与恢复的码片速率时钟脉冲同步,用于产生PN序列的比特,以分组形式的数据比特被伪随机调制并以突发形式发送到应答器。 中央站包括相关器,其与中心站的芯片速率时钟脉冲同步,以检测伪随机调制数据位之间与终端站的PN序列比特对应的伪随机数序列的相关性。
    • 10. 发明授权
    • Wireless communication system and frequency hopping method therefor, and base station and mobile station
    • 无线通信系统及其跳频方法,基站和移动台
    • US08428099B2
    • 2013-04-23
    • US12115154
    • 2008-05-05
    • Ryo TomokiyoMotoya Iwasaki
    • Ryo TomokiyoMotoya Iwasaki
    • H04B1/00
    • H04B1/7156H04B1/7143
    • In a wireless communication system, a control unit (17) of a base station (1) sets a frequency hopping cycle longer than a predetermined value during a certain measurement interval in which an measurement of a frequency drift is conducted, allowing reception of a plurality of reference signals of the same frequency in receiving an uplink signal from a mobile station (2). The control unit (17) controls a reference signal extraction unit (15) and a reference signal phase difference calculation unit (16) so as to measure, based on the plurality of reference signals, the phase shift amount of a received signal at the same frequency. Thus, the wireless communication system can measure the phase shift amount by controlling the frequency hopping.
    • 在无线通信系统中,基站(1)的控制单元(17)在进行频率漂移的测量的特定测量间隔期间设置比预定值更长的跳频周期,允许接收多个 在从移动站(2)接收上行链路信号时,具有相同频率的参考信号。 控制单元(17)控制参考信号提取单元(15)和参考信号相位差计算单元(16),以便基于多个参考信号测量相同信号的接收信号的相移量 频率。 因此,无线通信系统可以通过控制跳频来测量相移量。