公开(公告)号：US4646173A

公开(公告)日：1987-02-24

申请号：US744106

申请日：1985-06-12

申请人： Karl-Dirk Kammeyer ,  Andreas Rungeler

发明人： Karl-Dirk Kammeyer ,  Andreas Rungeler

IPC分类号： H04L7/00 ,  H04L7/02 ,  H04L27/38 ,  G11B5/09 ,  G11B5/00 ,  H04B1/10

CPC分类号： H04L7/0029 ,  H04L27/38 ,  H04L7/0062

摘要： Multi-phase/multi-level modulation data signals recorded on tape after conversion from original digital data are first converted to complex digital signals in an analog-to-digital converter in which the sampling rate is set by a pulse generator frequency controlled by the received signals through a control loop which develops a frequency control voltage (A). The complex digital signals have their real and imaginary parts separately filtered by filters of variable propagation time, but of constant bandwidth to produce complex signals to which the nearest permissible output complex signal (reference signal) is selected by a decision circuit (17), for final conversion to binary signals by a decoder (19) and a shift register (20). Timing shift correction is based on comparison of the received signals and reference signals of the decision stage to produce a control signal (.phi.) which further processed by addition to its previous value to produce a timing correction signal (A) which is applied both to the pulse generator for the sampling frequency of the analog-to-digital converter and to control the propagation time of digital non-recursive filters (14, 15). The timing correction signal (A) control of the filter propagation time makes possible a rapid timing shift correction that overcomes tape jitter effects. It is not necessary to stabilize the received carrier frequency because the tap recording preserves the relation between the sampling/keying frequency and the carrier frequency.

摘要翻译： 在从原始数字数据转换之后记录在磁带上的多相/多电平调制数据信号首先在模数转换器中转换为复数数字信号，其中采样速率由接收到的脉冲发生器频率 通过产生频率控制电压（A）的控制回路发出信号。 复数数字信号通过可变传播时间的滤波器分别对其实部和虚部进行滤波，但是具有恒定带宽以产生由决策电路（17）选择最接近的允许输出复信号（参考信号）的复数信号，为 由解码器（19）和移位寄存器（20）最终转换为二进制信号。 定时移位校正基于接收信号和判决级的参考信号的比较，以产生通过加上其先前值进一步处理的控制信号（phi），以产生定时校正信号（A），该定时校正信号（A）同时应用于 脉冲发生器，用于模拟 - 数字转换器的采样频率，并控制数字非递归滤波器（14,15）的传播时间。 定时校正信号（A）控制滤波器传播时间使得可以实现克服磁带抖动效应的快速定时偏移校正。 不需要稳定接收的载波频率，因为抽头记录保持采样/键控频率与载波频率之间的关系。

公开(公告)号：US5790595A

公开(公告)日：1998-08-04

申请号：US523699

申请日：1995-09-05

申请人： Marcus Benthin ,  Karl-Dirk Kammeyer

发明人： Marcus Benthin ,  Karl-Dirk Kammeyer

IPC分类号： G06F11/10 ,  H03M13/23 ,  H04L1/00 ,  H04L1/20 ,  H04L27/00

CPC分类号： H04L1/20

摘要： In a method for demodulation of multistage-modulated data, correspondence variables (decision variables) are determined from the comparison of the received signal with stored signals, and these correspondence variables are converted into a posteriori symbol probabilities. The received signal represents a symbol which in turn represents a data group. The a posteriori symbol probabilities are now accounted for in turn such that one individual probability information item is produced for each bit of a data group, which information indicates the probability of a relevant bit being +1. Reliability values are determined from these bit-specific probabilities, and these reliability values are output, together with the bits, as soft bits.

摘要翻译： 在解调多级调制数据的方法中，根据接收信号与存储信号的比较来确定对应变量（决定变量），并将这些对应变量转换成后验符号概率。 接收到的信号表示一个符号，它又表示一个数据组。 后验符号概率现在依次被考虑，使得针对数据组的每个位产生一个个体概率信息项，该信息指示相关比特为+1的概率。 从这些位特定概率确定可靠性值，并将这些可靠性值与位一起作为软比特输出。

公开(公告)号：US06603824B1

公开(公告)日：2003-08-05

申请号：US09673066

申请日：2000-11-30

申请人： Kalman Cinkler ,  Karl-Dirk Kammeyer

发明人： Kalman Cinkler ,  Karl-Dirk Kammeyer

IPC分类号： H04L2706

CPC分类号： H04L25/069 ,  H04L27/2332

摘要： A method for demodulating a carrier wave that is modulated using a digital symbol sequence and that is transmitted over a noise-impacted channel, the ideal edge shapes of possible transitions between two symbols being known and stored in memory as reference edges, and a received edge being scanned and digitalized using a scanning frequency that is a multiple of the frequency of the symbol sequence. In particular, for detecting a received and scanned edge, all scanning values are used for calculating Euclidean distances from at least two reference edges, and the reference edge associated with the lowest Euclidean distance is selected. A Viterbi algorithm is applied to a sequence of estimated edges (rather than to an estimated symbol sequence) and the specific Euclidean distances between the edge received in one symbol period and the reference edges are considered as the costs of one trellis branch of the Viterbi algorithm.

摘要翻译： 一种用于解调使用数字符号序列调制并且在受噪声影响的信道上发送的载波的方法，已知并存储在存储器中的两个符号之间的可能转换的理想边缘形状作为参考边缘，以及接收边缘 使用扫描频率进行扫描和数字化，扫描频率是符号序列的频率的倍数。 特别地，为了检测接收和扫描的边缘，所有扫描值被用于从至少两个参考边缘计算欧氏距离，并且选择与最低欧几里德距离相关联的参考边缘。 维特比算法被应用于估计边缘的序列（而不是估计的符号序列），并且在一个符号周期中接收的边缘与参考边缘之间的特定欧几里德距离被认为是维特比算法的一个网格分支的成本 。

公开(公告)号：US4506228A

公开(公告)日：1985-03-19

申请号：US405318

申请日：1982-08-05

申请人： Karl-Dirk Kammeyer

发明人： Karl-Dirk Kammeyer

IPC分类号： H03B27/00 ,  H03B28/00 ,  H03D3/00 ,  H03D3/02 ,  H03K9/04

CPC分类号： H03D3/007 ,  H03B27/00 ,  H03B28/00 ,  H03D2200/0035 ,  H03D2200/005 ,  H03D2200/006 ,  H03D2200/008 ,  H03D3/006 ,  H03D3/02

摘要： FM Signals are demodulated on an entirely digital basis by converting the digitalized signal into a pair of signals which are substantially Hilbert transforms of each other. This requires at least one pair of nonrecursive filters having lower signal sample rates at the output than at the input. Each signal is delayed by one output sample interval, so that cross products of the delayed and undelayed Hilbert transforms can be formed, and the difference between them obtained. Finally, an arc-sine table is used to remove sine-function distortion. A single multiplier-accumulator provided with extra registers can perform all of the necessary arithmetical operations at the speeds required.

摘要翻译： FM信号通过将数字化信号转换为彼此基本上为希尔伯特变换的一对信号而在完全数字的基础上进行解调。 这需要至少一对非递归滤波器，在输出处具有比在输入处具有更低的信号采样率。 每个信号被延迟一个输出采样间隔，从而可以形成延迟和未延迟希尔伯特变换的交叉乘积，并获得它们之间的差异。 最后，使用电弧正弦表来消除正弦函数失真。 提供额外寄存器的单个乘法器累加器可以以所需的速度执行所有必要的算术运算。

公开(公告)号：US07664186B2

公开(公告)日：2010-02-16

申请号：US10842970

申请日：2004-05-11

申请人： Lars Brötje ,  Karl-Dirk Kammeyer ,  Volker Kühn ,  Sven Vogeler

发明人： Lars Brötje ,  Karl-Dirk Kammeyer ,  Volker Kühn ,  Sven Vogeler

IPC分类号： H04K1/10

CPC分类号： H04L25/067 ,  H04L1/0045 ,  H04L27/2657 ,  H04L27/2691

摘要： The influence of a DC offset with a carrier-frequency offset at the same time is reduced in that the values of the assumed or determined DC offset and of the assumed or determined carrier-frequency offset are included in the determination of reliability information for one sub-carrier in the multicarrier system, and the reliability information is corrected in this way. A factor M, where M

摘要翻译： 降低了同时具有载波频率偏移的DC偏移的影响，因为假定或确定的DC偏移和假设或确定的载波频率偏移的值被包括在用于一个子信道的可靠性信息的确定中 在多载波系统中的载波，并且以这种方式校正可靠性信息。 基于DC偏移和载波频率偏移的值，为每个子载波定义M <1的因子M，并且将副载波的可靠性信息乘以这些因子M.

公开(公告)号：US4736392A

公开(公告)日：1988-04-05

申请号：US857859

申请日：1986-04-30

申请人： Karl-Dirk Kammeyer ,  Wolfgang Tobergte

发明人： Karl-Dirk Kammeyer ,  Wolfgang Tobergte

IPC分类号： H03D3/00 ,  H03H17/04 ,  H04B3/23 ,  H04B7/005 ,  H04L27/14 ,  H04B1/10

CPC分类号： H04B7/005 ,  H03D3/007 ,  H03H17/04 ,  H03D2200/005 ,  H03D2200/0054 ,  H03D2200/0092 ,  H03D3/006

摘要： For compensation of the effects of multi-path reception, a cascade distortion corrector composed of distortion corrector blocks successively connected in series is provided for a digital FM demodulator that needs non-recursive filtering. Each distortion corrector block produces an increase of the phase rotation and of the propagation time as well as a reduction of the reflection factor of the input signal. The cascade distortion corrector leads to a significant reduction of the hardware expense compared to the previously used transversal type filter structures. Sufficient compensation of the multi-path reception effects can be obtained by connecting five or six distortion corrector blocks one after the other.

摘要翻译： 为了补偿多路径接收的影响，为需要非递归滤波的数字FM解调器提供串联连续串联的失真校正块组成的级联失真校正器。 每个失真校正器块产生相位旋转和传播时间的增加以及输入信号的反射系数的减小。 与先前使用的横向型滤波器结构相比，级联失真校正器导致硬件费用的显着降低。 通过一个接一个地连接五个或六个失真校正器块可以获得足够的多路径接收效果的补偿。