公开(公告)号：US10009040B2

公开(公告)日：2018-06-26

申请号：US15475292

申请日：2017-03-31

Applicant: Topcon Positioning Systems, Inc.

Inventor： Nikolay Afanasievich Vazhenin ,  Andrey Vladimirovich Veitsel ,  Alexey S. Lebedinsky ,  Ivan Andreevich Kirjanov

IPC: H03M13/00 ,  H03M13/11 ,  H04L1/00 ,  H03M13/37 ,  H03M13/45

CPC classification number: H03M13/1111 ,  H03M13/1128 ,  H03M13/3723 ,  H03M13/3746 ,  H03M13/458 ,  H04L1/005 ,  H04L1/0052 ,  H04L1/0057

Abstract: Method of identification and compensation for inversion of the input bit stream when decoding LDPC codes includes obtaining a code word of the LDPC code from a demodulator output and writing the code word into a buffer memory, decoding the code word, calculating a syndrome for each iteration when decoding, making an analysis of converging the weight of the syndrome, generating an inversion feature for the input bit stream based on this analysis, continuing the decoding, if the inversion feature for the input bit stream does not give evidence of detecting inversion, resetting, if the inversion feature for the input bit stream shows inversion, the LDPC decoder and analysis parameters for the convergence of the weight of the syndrome, reading next code word from the buffer memory, and producing an inversion of this code word, and feeding the word to the decoder input to implement the next decoding operation.

公开(公告)号：US09621189B2

公开(公告)日：2017-04-11

申请号：US14865119

申请日：2015-09-25

Applicant: Topcon Positioning Systems, Inc.

Inventor： Nikolay Afanasievich Vazhenin ,  Andrey Vladimirovich Veitsel ,  Alexey S. Lebedinsky ,  Ivan Andreevich Kirjanov

IPC: H03M13/00 ,  H03M13/11 ,  H04L1/00 ,  H03M13/37 ,  H03M13/45

CPC classification number: H03M13/1111 ,  H03M13/1128 ,  H03M13/3723 ,  H03M13/3746 ,  H03M13/458 ,  H04L1/005 ,  H04L1/0052 ,  H04L1/0057

Abstract: Method of identification and compensation for inversion of the input bit stream when decoding LDPC codes includes obtaining a code word of the LDPC code from a demodulator output and writing the code word into a buffer memory, decoding the code word, calculating a syndrome for each iteration when decoding, making an analysis of converging the weight of the syndrome, generating an inversion feature for the input bit stream based on this analysis, continuing the decoding, if the inversion feature for the input bit stream does not give evidence of detecting inversion, resetting, if the inversion feature for the input bit stream shows inversion, the LDPC decoder and analysis parameters for the convergence of the weight of the syndrome, reading next code word from the buffer memory, and producing an inversion of this code word, and feeding the word to the decoder input to implement the next decoding operation.

公开(公告)号：US08982937B1

公开(公告)日：2015-03-17

申请号：US14527880

申请日：2014-10-30

Applicant: Topcon Positioning Systems, Inc.

Inventor： Mark I. Zhodzishsky ,  Victor A. Prasolov ,  Vladimir V. Veitsel ,  Dmitry M. Zhodzishsky ,  Alexey S. Lebedinsky ,  Ilya V. Ivantsov

IPC: H03D3/18 ,  H03D3/24 ,  H04L25/02 ,  H04B17/00 ,  H04L7/033 ,  H03L7/08

CPC classification number: H04L25/0262 ,  G01S19/37 ,  H03L7/08 ,  H03L2207/50 ,  H04B17/364 ,  H04L7/0331

Abstract: Navigation satellite receivers have a large number of channels, where phase discriminators and loop filter of a PLL operate in phase with data bits and control of numerically controlled oscillator (NCO) carried out simultaneously on all channels. Since symbol boundaries for different satellites do not match, there is a variable time delay between the generation of control signals and NCO control time. This delay may be measured by counting a number of samples in the delay interval. A proposed system measures non-energy parameters of the BPSK-signal carrier received in additive mixture with noise when a digital loop filter of PLL controls NCO with a constant or changing in time delay. A control unit controls bandwidth and a LF order by changing transfer coefficients based on analyzing estimated signal parameters and phase tracking error at a PD output.

Abstract translation: 导航卫星接收机具有大量信道，其中PLL的相位鉴别器和环路滤波器与所有信道上同时执行的数字位和数控振荡器（NCO）的相位操作。 由于不同卫星的符号边界不匹配，控制信号的产生和NCO控制时间之间存在可变的时间延迟。 该延迟可以通过对延迟间隔中的采样数进行计数来测量。 所提出的系统在PLL的数字环路滤波器控制NCO具有恒定或时间延迟变化时，测量在具有噪声的加法混合中接收的BPSK信号载波的非能量参数。 控制单元通过基于分析PD输出端的估计信号参数和相位跟踪误差来改变传输系数来控制带宽和LF顺序。