公开(公告)号：WO1990014727A1

公开(公告)日：1990-11-29

申请号：PCT/US1990002374

申请日：1990-05-03

Applicant: MOTOROLA, INC.

Inventor： MOTOROLA, INC. ,  CANNALTE, Gary, A. ,  BURKE, Dennis, E.

IPC: H04L25/06

CPC classification number: H04L25/062 ,  H04L25/066 ,  H04L27/142

Abstract: There is provided a scheme for centering data prior to detection. It comprises: determining carrier frequency error, and pre-adjusting the data detection process to compensate for that error throughout the ensuing data detection. This scheme for reliable multilevel data detection further comprises: upon detection of carrier (C2, R5, G1) presence, determining carrier frequency error, gating a voltage associated with the frequency error (R1, R3, C1) to the differential amplification process to establish common mode rejection and compensating for that error throughout the ensuing multi-level data detection, and then analog-to-digital conversion of the differentially amplified multi-level data. A scheme for computationally centering the subsequent data detected (C3, R4) to compensate for the error is also provided.

公开(公告)号：WO2006124060A3

公开(公告)日：2007-10-25

申请号：PCT/US2005039281

申请日：2005-10-31

Applicant: SIGMATEL INC

Inventor： MAY MICHAEL R

IPC: H04L27/06

CPC classification number: H04L25/05 ,  H03H17/0286 ,  H03H17/0614 ,  H03H17/0621 ,  H04L27/142 ,  H04L2027/0024 ,  H04L2027/0087

Abstract: A sample rate converter includes an upsampling module, a low pass filter, and a linear sample rate conversion module. The upsampling module is operably coupled up-sample a digital input signal having a first rate to produce a digitally up-sampled signal. The low pass filter is operably coupled to low pass filter the digitally up-sampled signal to produce a digitally filtered signal at an up-sampled rate. The linear sample rate conversion module is operably coupled to convert the digitally up-sampled signal into a sample rate adjusted digital signal having a second rate based on an control feedback signal and a linear function, wherein a relationship between the first rate and the second rate is a non­power of two.

Abstract translation: 采样率转换器包括上采样模块，低通滤波器和线性采样率转换模块。 上采样模块可操作地耦合上采样具有第一速率的数字输入信号以产生数字上采样信号。 低通滤波器可操作地耦合到低通滤波器数字上采样信号，以产生以上采样速率的数字滤波信号。 线性采样率转换模块可操作地耦合以将数字上采样信号转换为基于控制反馈信号和线性函数的具有第二速率的采样率调整数字信号，其中第一速率与第二速率之间的关系 是一个非权力的两个。

公开(公告)号：WO2005043852A9

公开(公告)日：2006-04-13

申请号：PCT/IB2004003562

申请日：2004-10-29

Applicant: KONINKL PHILIPS ELECTRONICS NV ,  RYTER ROLAND EGON

Inventor： RYTER ROLAND EGON

IPC: H04L25/06 ,  H04L27/00 ,  H04L27/14 ,  H04L27/152

CPC classification number: H04L27/1525 ,  H04L25/062 ,  H04L27/142 ,  H04L2027/003 ,  H04L2027/0063 ,  H04L2027/0095

Abstract: The apparatus (20) for determining a frequency offset error comprises an input (24.1) for receiving a digitally coded frequency demodulated signal (demod lp2). The frequency demodulated signal (demod lp2) is processed by digital means (35) for performing a correlation, and by digital means (36) for performing a minimum-maximum evaluation. In order to determine whether a correlation criterion and a minimum-maximum criterion are fulfilled, the apparatus (20) comprises digital processing means (38) to calculate the current offset of the frequency demodulated signal (demod lp2) and to cancel the current offset if both criteria are fulfilled.

Abstract translation: 用于确定频率偏移误差的装置（20）包括用于接收数字编码的频率解调信号（demod lp2）的输入（24.1）。 频率解调信号（demod lp2）由用于执行相关的数字装置（35）和用于执行最小最大值评估的数字装置（36）处理。 为了确定是否满足相关标准和最小 - 最大准则，装置（20）包括数字处理装置（38），用于计算频率解调信号（demod lp2）的当前偏移量，并且取消当前偏移量 两个标准都得到满足。

公开(公告)号：WO2003003682A1

公开(公告)日：2003-01-09

申请号：PCT/IB2002/001956

申请日：2002-06-03

Applicant: NOKIA CORPORATION

Inventor： SCHETELIG, Markus ,  BURGESS, Paul

IPC: H04L25/06

CPC classification number: H04L25/063 ,  H04L25/062 ,  H04L27/142

Abstract: The invention relates to a method and a device for estimating the DC offset portion of signal, especially of a signal containing parts with sinusoidal shaping, for example a signal which results from demodulation of a frequency modulated receive signal. According to the invention a method is presented for correcting the direct current offset portion (DC offset) of a first signal (Signal 1) which comprises the following steps: - phase shifting the first signal (Signal 1) for obtaining a second signal (Signal 2); comparing the first signal (Signal 1) and the second signal (Signal 2) with an estimated DC offset. The estimated DC offset is adjusted if the result of the comparison is, that the first signal (Signal 1) and the second signal (Signal 2) are on different sides of said estimated DC offset and the estimated DC offset is kept constant as long as the result of the comparison is, that the first signal (Signal 1) and the second signal (Signal 2) are on the same side of the estimated DC offset.

Abstract translation: 本发明涉及一种用于估计信号的DC偏移部分的方法和装置，特别是用于估计包含具有正弦整形的部分的信号，例如由调频接收信号的解调产生的信号。 根据本发明，提出一种用于校正第一信号（信号1）的直流偏移部分（DC偏移）的方法，其包括以下步骤： - 移位第一信号（信号1）以获得第二信号（信号 2）; 将第一信号（信号1）和第二信号（信号2）与估计的DC偏移进行比较。 如果比较结果是第一信号（信号1）和第二信号（信号2）在所述估计的DC偏移的不同侧，并且估计的DC偏移保持恒定，则调整估计的DC偏移，只要 比较的结果是，第一信号（信号1）和第二信号（信号2）位于估计的DC偏移的同一侧。

公开(公告)号：WO02033920A1

公开(公告)日：2002-04-25

申请号：PCT/EP2001/011619

申请日：2001-10-08

IPC: H03F3/45 ,  H03K5/003 ,  H04L25/06 ,  H04L27/14

CPC classification number: H04L25/061 ,  H03F3/45986 ,  H03K5/003 ,  H04L25/062 ,  H04L27/142

Abstract: A method of estimating a DC offset value of a signal includes estimating a DC offset value of a preamble part of the signal using a pair of diodes (D1, D2) and a resistor (R) connected in parallel. During receipt of the data part of the signal, the diode pair (D1, D2) is switched out of the circuit by a switch (SW). During reception of the data part, the DC level is estimated using a low pass filter (R, C).

Abstract translation: 估计信号的DC偏移值的方法包括使用一对并联连接的二极管（D1，D2）和电阻器（R）来估计信号的前导码部分的DC偏移值。 在接收信号的数据部分期间，二极管对（D1，D2）通过开关（SW）从电路切换出来。 在接收数据部分期间，使用低通滤波器（R，C）来估计DC电平。

公开(公告)号：WO2008117427A1

公开(公告)日：2008-10-02

申请号：PCT/JP2007/056359

申请日：2007-03-27

Applicant: 富士通株式会社 ,  中村 道春 ,  吉田 誠 ,  中谷 勇太 ,  小林 一彦

Inventor： 中村 道春 ,  吉田 誠 ,  中谷 勇太 ,  小林 一彦

IPC: H04J11/00 ,  H04L1/00

CPC classification number: H04L1/0045 ,  H03M13/03 ,  H03M13/6577 ,  H04L5/0007 ,  H04L25/067 ,  H04L27/142 ,  H04L27/2653

Abstract: 周波数軸上の前記複数のサブキャリアで構成される信号を用いて誤り訂正符号の復号をする受信機であって、サブキャリアの周波数に依存するノイズの影響を受けるサブキャリアの信号に対し、低い信頼度の重みを付加する重み付加部と、前記サブキャリアの信号と前記重み付加部で付加された前記低い信頼度の重みとを用いて、誤り訂正符号の復号をする誤り訂正復号部と、を備える受信機とした。

Abstract translation: 接收机使用由频率轴上的多个子载波构成的信号来解码纠错码。 接收机包括权重添加部分，其根据副载波频率向噪声影响的副载波信号增加低可靠性的权重; 以及误差校正解码部，其使用副载波信号和由加权加法部附加的低可靠性的权重来解码纠错码。

公开(公告)号：WO2004088902A3

公开(公告)日：2005-05-06

申请号：PCT/US2004009171

申请日：2004-03-25

Applicant: MOTOROLA INC ,  GAMBLE KEVIN JACKSON ,  CARSELLO STEPHEN

Inventor： GAMBLE KEVIN JACKSON ,  CARSELLO STEPHEN

IPC: H04L27/00 ,  H04L27/14 ,  H04L27/152 ,  H04L27/06

CPC classification number: H04L27/142 ,  H04L27/1525 ,  H04L2027/0016 ,  H04L2027/0024

Abstract: A wireless receiver (200) and corresponding method (500) is arranged to mitigate the effects of non-ideal receiver processing and comprises: a signal source (202) for providing an injection signal that is controlled to have a unique frequency at each of a plurality of time periods; and a non-ideal receiver device (208) constructed to use the injection signal for down converting a received signal having a known frequency to collect a plurality of waveform samples, each having a desired characteristic that varies with the unique frequency and an undesired characteristic, wherein one of the plurality of waveform samples with the undesired characteristic removed will retain the desired characteristic of the received signal.

Abstract translation: 布置无线接收器（200）和相应的方法（500）以减轻非理想接收机处理的影响，并包括：信号源（202），用于提供被控制为在每个 多个时间段; 以及非理想接收机设备（208），被构造为使用所述注入信号来下变频具有已知频率的接收信号，以收集多个波形样本，每个具有随所述唯一频率和非期望特性而变化的期望特性， 其中具有去除不想要的特性的多个波形样本之一将保留所接收信号的期望特性。

公开(公告)号：WO1997044898A1

公开(公告)日：1997-11-27

申请号：PCT/US1997007591

申请日：1997-05-05

Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION ,  DINGSOR, Andrew, D.

Inventor： INTERNATIONAL BUSINESS MACHINES CORPORATION

IPC: H03J07/02

CPC classification number: H04L27/142 ,  H03J7/02 ,  H04B1/40 ,  H04L27/12

Abstract: A method, apparatus and article of manufacture for compensating for carrier frequency error is disclosed. An FM signal is received from an antenna and the received FM signal is provided to a receiver. The receiver takes the FM signal at the carrier frequency and outputs a baseband signal. This baseband signal is then processed by a DSP which provides carrier frequency compensation and decoding to produce a data stream that a microprocessor provides to a host device. Frequency differences between the FM carrier frequency and the frequency used to demodulate the FM signal can shift the DC bias level of the baseband signal. The DSP compensates for such frequency difference by using a receive compensation value and applying it to each received signal sample. When transmitting, data to be transmitted is provided from the host device to the DSP via a microprocessor. The DSP provides encoding and carrier frequency compensation of the data to provide a baseband signal to a transmitter that modulates the baseband signal to produce anFM signal at a desired carrier frequency. Frequency differences between the desired FM carrier frequency and the frequency used to modulate the baseband signal can produce errors in receiver systems. The DSP compensates for such a frequency difference by using a transmit compensation value and applying it to each encoded signal sample.

Abstract translation: 公开了一种用于补偿载波频率误差的方法，装置和制品。 从天线接收FM信号，并将接收到的FM信号提供给接收机。 接收机以载波频率接收FM信号并输出​​基带信号。 该基带信号然后由提供载波频率补偿和解码的DSP处理以产生微处理器向主机设备提供的数据流。 FM载波频率与用于解调FM信号的频率之间的频率差可能会改变基带信号的直流偏置电平。 DSP通过使用接收补偿值来补偿这种频率差，并将其应用于每个接收的信号样本。 发送时，通过微处理器从主设备向DSP提供要发送的数据。 DSP提供数据的编码和载波频率补偿，以向发射机提供基带信号，该发射机调制基带信号以产生期望载波频率的F M信号。 所需的FM载波频率与用于调制基带信号的频率之间的频率差可能在接收机系统中产生误差。 DSP通过使用发射补偿值并将其应用于每个编码信号样本来补偿这样的频率差。

公开(公告)号：WO9620540A3

公开(公告)日：1996-09-06

申请号：PCT/US9516363

申请日：1995-12-19

Applicant: QUALCOMM INC

Inventor： BLACK PETER J ,  WILSON NATHANIEL B

IPC: H04L27/10 ,  H04B1/04 ,  H04B1/40 ,  H04B7/26 ,  H04L25/49 ,  H04L27/14 ,  H04L27/233 ,  H04W4/18 ,  H04W88/06 ,  H04J15/00

CPC classification number: H04B1/406 ,  H04B2201/70707 ,  H04L25/4904 ,  H04L27/142 ,  H04L27/2337 ,  H04W4/18 ,  H04W88/06

Abstract: A dual-mode digital communication system for communicating an information signal during operation in frequency-modulated (FM) and multiple-access modes is disclosed herein. The digital communication system includes a dual-mode transmitter (14) for transmitting the information signal using an FM communication signal during FM mode operation, and for transmitting the information signal using a multiple-access communication signal during multiple-access mode operation. The communication system further includes a dual-mode receiver (16) for receiving the FM communication signal during FM mode operation, and for receiving the multiple-access communication signal during multiple-access mode operation. Incorporated within the dual-mode receiver (16) is a digital demodulator (96) for recovering the information signal from the received FM signal during operation in the FM mode, and for recovering the information signal from the received multiple-access signal during multiple-access mode operation. 00000

Abstract translation: 这里公开了一种用于在频率调制（FM）和多接入模式中的操作期间传送信息信号的双模式数字通信系统。 数字通信系统包括用于在FM模式操作期间使用FM通信信号发送信息信号的双模发送器（14），并且在多址模式操作期间使用多址通信信号发送信息信号。 通信系统还包括用于在FM模式操作期间接收FM通信信号的双模式接收器（16），并且用于在多址模式操作期间接收多址通信信号。 在双模式接收器（16）中并入的是数字解调器（96），用于在FM模式下操作期间从接收到的FM信号中恢复信息信号，并且用于在多模式接收器（16）期间从所接收的多址信号中恢复信息信号， 访问模式操作。 00000

公开(公告)号：WO1996020540A2

公开(公告)日：1996-07-04

申请号：PCT/US1995016363

申请日：1995-12-19

Applicant: QUALCOMM INCORPORATED

Inventor： QUALCOMM INCORPORATED ,  BLACK, Peter, J. ,  WILSON, Nathaniel, B.

IPC: H04B01/40

CPC classification number: H04B1/406 ,  H04B2201/70707 ,  H04L25/4904 ,  H04L27/142 ,  H04L27/2337 ,  H04W4/18 ,  H04W88/06

Abstract: A dual-mode digital communication system for communicating an information signal during operation in frequency-modulated (FM) and multiple-access modes is disclosed herein. The digital communication system includes a dual-mode transmitter (14) for transmitting the information signal using an FM communication signal during FM mode operation, and for transmitting the information signal using a multiple-access communication signal during multiple-access mode operation. The communication system further includes a dual-mode receiver (16) for receiving the FM communication signal during FM mode operation, and for receiving the multiple-access communication signal during multiple-access mode operation. Incorporated within the dual-mode receiver (16) is a digital demodulator (96) for recovering the information signal from the received FM signal during operation in the FM mode, and for recovering the information signal from the received multiple-access signal during multiple-access mode operation.

Abstract translation: 本文公开了一种用于在频率调制（FM）和多路访问模式中的操作期间传送信息信号的双模式数字通信系统。 数字通信系统包括在FM模式操作期间使用FM通信信号发送信息信号的双模发送器（14），并且在多访问模式操作期间使用多址通信信号发送信息信号。 通信系统还包括用于在FM模式操作期间接收FM通信信号的双模式接收器（16），并且用于在多址模式操作期间接收多址通信信号。 在双模式接收器（16）中并入的是数字解调器（96），用于在FM模式下操作期间从所接收的FM信号中恢复信息信号，并且用于在多模式接收器（16）期间从所接收的多址信号中恢复信息信号， 访问模式操作。