公开(公告)号：WO1991008624A1

公开(公告)日：1991-06-13

申请号：PCT/US1990006784

申请日：1990-11-26

Applicant: MOTOROLA, INC.

Inventor： MOTOROLA, INC. ,  BIRCHLER, Mark, Allen ,  JASPER, Steven, Charles

IPC: H04B15/00

CPC classification number: H03G3/32 ,  H03G3/28 ,  H04B1/12

Abstract: A method for reducing noise caused by fading in FM radio systems . The algorithm described operates on a sequence of complex samples received at the input of the discriminator (501) from the output of the IF filter of a digitally implemented radio. After determination of magnitude (502), which yields the raw envelope of the received signal, the raw envelope information is processed via parallel paths to determine characteristics indicative of shape, amplitude and time of occurrence of noise pulses. The output signal from the discriminator (501) is processed (508) to determine noise pulse direction. A pulse generator (510) produces counter pulses based upon the previously determined characteristcs, and the counter pulses are combined (513) with the discriminator output to substantially cancel the noise pulses.

Abstract translation: 一种降低FM收音机系统衰落引起的噪声的方法。 所描述的算法对从数字实现的无线电的IF滤波器的输出在鉴别器（501）的输入处接收的一系列复杂样本进行操作。 在确定产生接收信号的原始包络的幅度（502）之后，通过并行路径处理原始包络信息，以确定指示噪声脉冲的形状，幅度和时间出现的特性。 处理来自鉴别器（501）的输出信号（508）以确定噪声脉冲方向。 脉冲发生器（510）基于先前确定的特征产生计数器脉冲，并且将计数器脉冲与鉴别器输出组合（513）以基本上消除噪声脉冲。

公开(公告)号：WO1993009617A1

公开(公告)日：1993-05-13

申请号：PCT/US1992008069

申请日：1992-09-23

Applicant: MOTOROLA, INC.

Inventor： MOTOROLA, INC. ,  JASPER, Steven, Charles ,  BIRCHLER, Mark, A.

IPC: H04J11/00

CPC classification number: H04L27/2602 ,  H04L27/262

Abstract: In a digital communication system in which pulse-shape filtered sync (202), pilot (203), and data symbols (201), arranged in successive time slots, modulate sub-channel carriers (309) via sub-channel mixers (308) to form sub-channel symbol streams for combination into a composite signal for transmission, deterministic portions of each time slot are rendered identical by determining phase difference of sub-channel carriers and rotating the phase of each sub-channel symbol stream by an amount equal to the phase difference, but with opposite sign.

公开(公告)号：WO1995006983A1

公开(公告)日：1995-03-09

申请号：PCT/US1994007952

申请日：1994-07-15

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  JASPER, Steven, Charles ,  BIRCHLER, Mark, Allen

IPC: H04B01/26

CPC classification number: H03D3/009 ,  H03D7/165 ,  H03D2200/005 ,  H03D2200/0092 ,  H04B1/1027 ,  H04B7/005

Abstract: In the following manner, a receiver (300) that receives quadrature modulated signals (r) may determine desired components of the quadrature modulated signals by minimizing effects of transmitted distortion produced by gain, phase, or gain-phase imbalance. A quadrature modulated signal (r) that includes a desired component, a fading component, and a transmitter distortion component is received by the receiver, wherein the transmitter distortion component includes a conjugate component and an imbalance component. The receiver (300) estimates the fading component (311), the conjugate component (312), and the imbalance component (314) and determines the desired component (315) based on these estimates and the quadrature modulated signal (r).

Abstract translation: 以下述方式，接收正交调制信号（r）的接收机（300）可以通过最小化由增益，相位或增益相位不平衡产生的发送失真的影响来确定正交调制信号的期望分量。 由接收机接收包括所需分量，衰落分量和发射机失真分量的正交调制信号（r），其中发射机失真分量包括共轭分量和不平衡分量。 接收器（300）基于这些估计和正交调制信号（r）估计衰落分量（311），共轭分量（312）和不平衡分量（314）并确定期望分量（315）。

公开(公告)号：WO1990004887A1

公开(公告)日：1990-05-03

申请号：PCT/US1989004064

申请日：1989-09-22

Applicant: MOTOROLA, INC.

Inventor： MOTOROLA, INC. ,  JOHNSON, Mark, J. ,  YESTER, Francis, R., Jr. ,  JASPER, Steven, Charles

IPC: H04B01/10

CPC classification number: H03G3/344 ,  H04B1/16

Abstract: A method is disclosed for determining when a frequency-modulated expected information signal resides at a predetermined channel. The method is based on determining a value (17) based on the frequency deviation of the received signal (15) and then comparing the value (18) with a threshold (19) based on the expected information signal. The method is particularly well-suited for use as a squelch detector in digital FM radios.

公开(公告)号：WO1994028637A1

公开(公告)日：1994-12-08

申请号：PCT/US1994005154

申请日：1994-05-11

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  BIRCHLER, Mark, Allen ,  JASPER, Steven, Charles ,  WILSON, Timothy, John

IPC: H04B03/46

CPC classification number: H04B17/20

Abstract: A receiver that receives (203) a stream of information symbols (101) may detect that usability of the stream of information symbols received as follows. Upon receiving the stream of information symbols (101), the receiver (203) separates the stream of information symbols into a desired portion and an undesired portion wherein the desired portion is the originally transmitted stream of information symbols and the undesired portion is interference and noise (204). From the undesired portion and the desired portion, the usability can be determined based on a ratio of the two portions.

Abstract translation: 接收（203）信息符号流（101）的接收机可以检测如下接收的信息符号流的可用性。 在接收到信息符号流（101）时，接收机（203）将信息符号流分离成期望部分和不期望部分，其中期望部分是原始传输的信息符号流，而不期望的部分是干扰和噪声 （204）。 从不期望的部分和期望的部分，可用性可以基于两个部分的比例来确定。

公开(公告)号：WO1987001540A1

公开(公告)日：1987-03-12

申请号：PCT/US1986001765

申请日：1986-08-25

Applicant: MOTOROLA, INC.

Inventor： MOTOROLA, INC. ,  JANC, Robert, Vincent ,  JASPER, Steven, Charles

IPC: H04B15/00

CPC classification number: G01S19/30 ,  G01S19/29

Abstract: A digital receiver (100) for GPS C/A-code signals. The GPS receiver (100) of the present invention provides reception and tracking a plurality of satellites simultaneously, using four separate receiver channels. The GPS receiver (100) of the present invention includes an analog front-end (104) for selecting and frequency translating the received GPS signal. The GPS receiver (100) further includes a highspeed digital signal processor (110) for recovering the despread data of the GPS signal. The baseband signal is further processed by a general purpose digital signal processor (112) for signal search, tracking, and data recovery operations, and a microprocessor (114) provides overall receiver control, and interface with the operator of the GPS receiver (100).

Abstract translation: 一种用于GPS C / A码信号的数字接收机（100）。 本发明的GPS接收机（100）使用四个独立的接收机信道同时提供对多个卫星的接收和跟踪。 本发明的GPS接收机（100）包括用于选择和频率转换接收到的GPS信号的模拟前端（104）。 GPS接收机（100）还包括用于恢复GPS信号的解扩数据的高速数字信号处理器（110）。 基带信号由用于信号搜索，跟踪和数据恢复操作的通用数字信号处理器（112）进一步处理，并且微处理器（114）提供总体接收器控制，并且与GPS接收器（100）的操作者接口， 。

公开(公告)号：WO1994028623A1

公开(公告)日：1994-12-08

申请号：PCT/US1994005667

申请日：1994-05-20

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  BIRCHLER, Mark, Allen ,  JASPER, Steven, Charles ,  WILSON, Timothy, John

IPC: H03D01/04

CPC classification number: H04L1/20 ,  H04B1/1027 ,  H04B17/20

Abstract: A receiver (202) may reduce the effects of distortion when determining signal usability in the following manner. Upon receiving a signal (201), the receiver (202) separates a desired component, an undesired component, and a distortion component, wherein the desired component includes the signal that was originally transmitted and the undesired component includes interference and noise. Hving isolated the distortion component, it can be mitigated such that the usability of the signal received can be determined based on a ratio between the desired and undesired components.

Abstract translation: 当以下列方式确定信号可用性时，接收器（202）可以减小失真的影响。 在接收到信号（201）时，接收器（202）分离出期望的分量，不期望的分量和失真分量，其中期望分量包括最初传输的信号，并且不需要的分量包括干扰和噪声。 Hving隔离失真分量，可以减轻接收信号的可用性，可以根据期望和不需要的组件之间的比率来确定。

公开(公告)号：WO1994027390A1

公开(公告)日：1994-11-24

申请号：PCT/US1994004110

申请日：1994-04-14

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  CRISLER, Kenneth, James ,  STURGILL, Robert, Martin ,  JASPER, Steven, Charles ,  EMEOTT, Stephen, Paul ,  MARTURANO, Lawrence, Joseph ,  HONG, Daehyoung

IPC: H04L05/12

CPC classification number: H03M13/256 ,  H03M13/25 ,  H04L27/3433

Abstract: A method and system (300) for encoding data comprising a variable rate trellis coder (302) which receives a plurality of discrete data elements - e.g., input bits - and trellis encodes the information pursuant to a known set of coding rules, producing a plurality of trellis encoded symbols (303). Further, another variable input is used by the trellis coder (302) to determine the coding rate - i.e., symbols (303) are encoded and outputted to a dimensional formatter (306) at a rate which is determined by a rate control signal (305) as output by the variable rate controller (304). The dimensional formatter (306) acts in response to input from the variable rate controller (304), providing formatted symbols (308) to a modulator (310). The modulator (310), which in a preferred embodiment is a QAM modulator, is used to modulate the information signal onto a carrier signal for transmission over the communication channel.

Abstract translation: 一种用于对包含可变速率网格编码器（302）的数据进行编码的方法和系统（300），该可变速率网格编码器（302）接收多个离散数据元素（例如，输入比特），并根据一组已知的编码规则对该信息进行网格编码，从而产生多个 的网格编码符号（303）。 此外，网格编码器（302）使用另一个可变输入来确定编码速率 - 即符号（303）被编码并以速率控制信号（305）确定的速率输出到维格式化器（306） ）作为可变速率控制器（304）的输出。 尺寸格式器（306）响应于来自可变速率控制器（304）的输入而起作用，向调制器（310）提供格式化的符号（308）。 在优选实施例中，调制器（310）是QAM调制器，用于将信息信号调制到载波信号上，以在通信信道上传输。

公开(公告)号：WO1987001531A1

公开(公告)日：1987-03-12

申请号：PCT/US1986001764

申请日：1986-08-25

Applicant: MOTOROLA, INC.

Inventor： MOTOROLA, INC. ,  JANC, Robert, Vincent ,  JASPER, Steven, Charles ,  LONGLEY, Lester, Anderson ,  LAMBERT, Katherine, Helen ,  TURNEY, William, Joseph ,  LILLIE, Ross, James

IPC: H03D01/24

CPC classification number: H03D1/2245 ,  H03D3/006 ,  H03D3/007 ,  H03D2200/005 ,  H03D2200/0052

Abstract: The digital receiver (100) contemplates a digital radio receiver which operates on a received analog signal which has been converted to a digital form after preselection at the output of the antenna. The digital receiver (100) of the present invention comprises a preselector (106), a high-speed analog-to-digital (A/D) converter (108), a digitally implemented itermediate-frequency (IF) selectively section (110) having an output signal at substantially baseband frequencies, and digital signalprocessor (DSP) circuit (120) performing demodulation and audio filtering. The radio architecture of the present invention is programmably adaptable to virtually every known modulation scheme and is particularly suitable for implementation on integrated circuits.

Abstract translation: 数字接收机（100）考虑了一种数字无线电接收机，该数字无线电接收机对接收到的模拟信号进行操作，该接收的模拟信号在天线的输出预选之后被转换成数字形式。 本发明的数字接收机（100）包括预选器（106），高速模拟数字（A / D）转换器（108），数字实现的中频（IF）选择器部分（110） 具有基本上基带频率的输出信号和执行解调和音频滤波的数字信号处理器（DSP）电路（120）。 本发明的无线电架构可编程地适应于几乎每个已知的调制方案，并且特别适用于集成电路上的实现。