公开(公告)号：WO01019046A1

公开(公告)日：2001-03-15

申请号：PCT/EP2000/008701

申请日：2000-09-06

IPC: H04L27/14 ,  H04L27/18 ,  H04L27/233

CPC classification number: H04L27/2332 ,  H04L27/18

Abstract: Angle-modulated signals are transmitted in a communications system. Coding information is inserted into the data to be transmitted (dk) at regular intervals and phase-modulated together with said data to be transmitted (dk). This coding process is used for pulse shaping so that the receiver (27) can recover the digital data to be transmitted (dk) by processing the signal accordingly without the carrier phase being regulated and therefore, more simply.

Abstract translation: 在通信系统中的角度调制信号被传输，为此目的在所述传输数据（DK）等间隔的编码信息被插入并进行相位调制与发送数据（DK）。 该编码被用于脉冲整形，使得所述接收器（27）通过一个相应的信号处理，而不具有降低的实施复杂度的载波相位控制可以检索该数字传送数据（DK）。

公开(公告)号：WO00069063A1

公开(公告)日：2000-11-16

申请号：PCT/US2000/010900

申请日：2000-04-20

IPC: H04L27/01 ,  H04B7/26 ,  H04L25/06 ,  H04L27/14 ,  H04L27/38 ,  H03D1/06 ,  H03D11/04 ,  H03K5/01 ,  H03K6/04 ,  H04B1/10 ,  H04L1/00 ,  H04L25/08

CPC classification number: H04L25/063

Abstract: A processing system (216) selects (1004) a portion (702-706) of a received signal including an evaluation symbol (702), along with a preceding symbol (704) received immediately before the evaluation symbol, and a following symbol (706) received immediately after the evaluation symbol; and prefixes (1006) to the portion of the received signal a previously estimated symbol (708) received immediately before the portion, thereby producing an evaluation portion (712, 904). The processing system then compares (1008) the evaluation portion with templates equal in length to the evaluation portion and including different combinations of trial symbols and the at least one previously estimated symbol, prefixed to the trial symbols; and estimates (1010) the evaluation symbol to be equal to a trial symbol in one of the templates having a highest correlation with the evaluation portion, the trial symbol having a position matching that of the evaluation symbol in the evaluation portion.

Abstract translation: 处理系统（216）选择（1004）包括评估符号（702）的接收信号的一部分（702-706）以及紧接在评估符号之前接收的先前符号（704）和随后的符号（706 ）在评估符号后立即收到; 以及在所述接收信号的所述部分前面（1006）将先前估计的符号（708）紧接在所述部分之前，由此产生评估部分（712,904）。 处理系统然后将评估部分与长度相等的模板与评估部分进行比较（1008），并且包括尝试符号和试用符号前缀的至少一个先前估计的符号的不同组合; 并且将所述评估符号估计（1010）为与所述评估部分具有最高相关性的模板之一中的试验符号，所述试验符号具有与所述评估部分中的评估符号的位置相匹配的位置。

公开(公告)号：WO0030265A3

公开(公告)日：2000-08-03

申请号：PCT/SE9902084

申请日：1999-11-15

Applicant: ERICSSON TELEFON AB L M

Inventor： JAKOBSSON PETER

IPC: H03D1/22 ,  H04B1/16 ,  H04B1/30 ,  H04B17/00 ,  H04L27/14

CPC classification number: H04W52/028 ,  H04B1/1615 ,  Y02D70/00 ,  Y02D70/1222 ,  Y02D70/25 ,  Y02D70/40

Abstract: To solve the problems associated with conventional signal strength measurements utilizing homodyne receivers, the present invention is able to economically reduce the idle time power usage of a homodyne receiver by "powering down" a part of the homodyne receiver. With certain signal modulations, the power received in each channel of the homodyne receiver is equivalent and, as a result, th estimated received signal strength measurement calculation is simplified, reducing the power usage, which can be very useful, especially in the mobile communications industry.

Abstract translation: 为了解决与使用零差接收机的常规信号强度测量相关的问题，本发明能够通过“降低”零差接收机的一部分来经济地减少零差接收机的空闲时间功率使用。 通过某些信号调制，在零差接收机的每个信道中接收的功率是相等的，因此，估计的接收信号强度测量计算被简化，减少了功率使用，这在非常有用的情况下尤其在移动通信行业 。

公开(公告)号：WO00038385A1

公开(公告)日：2000-06-29

申请号：PCT/US1999/030803

申请日：1999-12-22

IPC: H04L27/14 ,  H03D3/00 ,  H04B1/16 ,  H04B1/30 ,  H04L25/06 ,  H04L27/22 ,  H04L27/152

CPC classification number: H04L25/063 ,  H03D3/008

Abstract: A quadrature receiver (10) including a downconverter (22) configured to convert a wireless communication signal into a baseband signal; and an I/Q offset processor (40) coupled with the downconverter (22) and configured to sample the baseband signal to provide plural sampled vectors, to generate a difference vector from the sampled vectors, to generate a scaled vector from the difference vector, and to sum the difference vector, the scaled vector and one of the sampled vectors to provide a direct current offset signal. A method of calculating direct current offset including receiving a wireless communication signal; downconverting the wireless communication signal following the receiving; sampling the wireless communication signal providing plural sampled vectors; calculating a difference vector from the sampled vectors; calculating a scaled vector from the difference vector; and summing the difference vector, the scaled vector and one of the sampled vectors to provide a direct current offset signal.

Abstract translation: 包括下变频器（22）的正交接收机（10），其被配置为将无线通信信号转换为基带信号; 以及与所述下变频器（22）耦合并被配置为对所述基带信号进行采样以提供多个采样矢量的I / Q偏移处理器（40），以从所述采样矢量生成差矢量，以从所述差矢量生成缩放矢量， 并且将差矢量，缩放矢量和一个采样矢量相加以提供直流偏移信号。 一种计算直流偏移的方法，包括接收无线通信信号; 在接收之后下变频无线通信信号; 对提供多个采样矢量的无线通信信号进行采样; 从采样矢量计算差矢量; 从差分矢量计算标度矢量; 并将差矢量，缩放矢量和一个采样矢量相加，以提供直流偏移信号。

公开(公告)号：WO0001061A3

公开(公告)日：2000-03-23

申请号：PCT/IB9901096

申请日：1999-06-14

Applicant: KONINKL PHILIPS ELECTRONICS NV ,  PHILIPS SVENSKA AB

Inventor： STROET PETER ,  MOHINDRA RISHI

IPC: H03H7/18 ,  H03D3/02 ,  H03D3/06 ,  H03H7/19 ,  H03H11/18 ,  H04L27/14

CPC classification number: H03D3/02

Abstract: An approach for demodulating a frequency-modulated signal involves processing a frequency-modulated signal with a phase shifter network to provide a demodulated signal that has a relatively constant amplitude around the center frequency of the frequency-modulated signal and that exhibits a relatively linear phase change over an operational frequency range. Embodiments of the invention include a phase shifter network comprising N number of all-pass filters and a phase shifter network comprising a low-pass bessel filter.

Abstract translation: 用于解调频率调制信号的方法涉及用移相器网络处理频率调制信号，以提供在调频信号的中心频率周围具有相对恒定振幅的解调信号，并且表现出相对线性的相位变化 超过工作频率范围。 本发明的实施例包括包括N个全通滤波器的移相器网络和包括低通贝塞尔滤波器的移相器网络。

公开(公告)号：WO00011831A2

公开(公告)日：2000-03-02

申请号：PCT/SE1999/001384

申请日：1999-08-17

IPC: H04L27/12 ,  H04L7/00 ,  H04L7/04 ,  H04L25/06 ,  H04L27/14 ,  H03C3/00

CPC classification number: H04L7/041 ,  H04L7/046 ,  H04L25/062 ,  H04L27/142

Abstract: Methods and apparatus for performing synchronization and DC-offset compensation in FM transmission systems significantly reduce the overhead associated with transmitting a conventional digital preamble at the start of each of a succession of transmitted digital data packets. According to exemplary embodiments, a multi-part digital preamble includes a short, substantially DC-free leading part followed by a code-protected synchronization part which is not necessarily substantially DC-free. The leading part provides for coarse DC offset estimation and synchronization, while the coded synchronization part carries timing and/or other useful information which can be unique for each packet. One or more substantially DC-free trailing parts follow the synchronization part, or are included in the synchronization part itself, and provide for fine tuning of the DC-offset estimate. Since the substantially DC-free leading and trailing parts are extremely short, and since the synchronization part carries useful information, the overhead associated with a preamble according to the invention is significantly reduced as compared to a conventional, entirely DC-free, preamble.

Abstract translation: 用于在FM传输系统中执行同步和DC偏移补偿的方法和装置显着地减少了在一系列发送的数字数据分组中的每一个的开始时与传统的数字前同步码相关的开销。 根据示例性实施例，多部分数字前同步码包括短的，基本上无DC的前导部分，其后是代码保护的同步部分，其不一定基本上不含DC。 前导部分提供粗略的直流偏移估计和同步，而编码的同步部分承载每个分组可以是唯一的定时和/或其它有用的信息。 一个或多个基本无DC的拖尾部分跟随同步部分，或者被包括在同步部分本身中，并且提供DC偏移估计的微调。 由于基本上无DC的前导和后置部分非常短，并且由于同步部分携带有用的信息，所以与常规的，完全不含DC的前置码相比，与根据本发明的前同步码相关联的开销显着降低。

公开(公告)号：WO9959307A8

公开(公告)日：2000-01-27

申请号：PCT/US9910319

申请日：1999-05-13

Applicant: COMSAT CORP

Inventor： SAYEGH SOHEIL I

IPC: H04L7/04 ,  H04L27/00 ,  H04L27/233 ,  H04L27/14 ,  H04L27/22

CPC classification number: H04L27/2332 ,  H04L7/042 ,  H04L2027/0091

Abstract: A method and apparatus for determining initial carrier and symbol phase estimates in a burst mode digital communication system are described. In-phase and quadrature sample of a BPSK preamble are sampled to obtain correlation values (YE, YO, XE, XO). Next, sum (7, 9, 10) and differences (8, 11, 12) of the correlation values are obtained. Then the initial carrier phase estimate (THETAHAT) and the initial symbol phase estimate (TAUHAT) are obtained through application of an algorithm. The apparatus that implements the method consists of adders (9, 10, 11, 12, 16, 17), inverters (7, 8, 15), arc tangent look-up tables (13, 14) and divide by 2 logic units (18, 19).

Abstract translation: 描述了用于在突发模式数字通信系统中确定初始载波和符号相位估计的方法和装置。 对BPSK前导码的同相和正交样本进行采样，以获得相关值（YE，YO，XE，XO）。 接下来，获得相关值的和（7,9,10）和差（8,11,12）。 然后通过应用算法获得初始载波相位估计（THETAHAT）和初始符号相位估计（TAUHAT）。 实现该方法的装置包括加法器（9,10,11,12,16,17），反相器（7,8,15），反正切查找表（13,14）和除以2个逻辑单元 18，19）。

公开(公告)号：WO9957912A3

公开(公告)日：2000-01-20

申请号：PCT/IB9900750

申请日：1999-04-26

Applicant: KONINKL PHILIPS ELECTRONICS NV ,  PHILIPS SVENSKA AB

Inventor： MOHINDRA RISHI

IPC: H03D3/00 ,  H04L27/14 ,  H04L27/22 ,  H04L27/38

CPC classification number: H03D3/008 ,  H04L27/142

Abstract: The present invention provides dc offset compensation circuit (800) for a zero IF FM quadrature demodulator in an AMPS cellular mobile telephone system. A frequency offset is introduced to remove modulation inherent dc components from supervisory audio tones and Manchester codes from a modulated signal. The local oscillator (608) is operated at a frequency that is slightly different, e.g. 5 kHz from a frequency which would mix down the intermediate frequency signal to zero. A dc offset is produced with a control loop to eliminate fixed dc components caused by leakage from a local oscillator (608). After a given time, the control loop may be frozen and the frequency offset of the local oscillator (608) can be removed.

Abstract translation: 本发明提供一种用于AMPS蜂窝移动电话系统中的零IF FM正交解调器的直流偏移补偿电路（800）。 引入频率偏移以从调制信号中去除监控音频音调和曼彻斯特码中的调制固有直流分量。 本地振荡器（608）以略微不同的频率操作，例如， 从将中频信号混合到零的频率5 kHz。 通过控制回路产生直流偏移，以消除由本地振荡器的泄漏引起的固定直流分量（608）。 在给定时间之后，控制环路可能被冻结，并且可以去除本地振荡器（608）的频率偏移。

公开(公告)号：WO99048214A3

公开(公告)日：1999-11-18

申请号：PCT/IB1999/000351

申请日：1999-03-02

IPC: G10L13/00 ,  G10L19/00 ,  H03M20060101 ,  H03M7/40 ,  H04B14/04 ,  H04L17/00 ,  H04L27/00 ,  H04L27/04 ,  H04L27/06 ,  H04L27/12 ,  H04L27/14 ,  H04L27/20 ,  H04L27/22

CPC classification number: H03M7/4006

Abstract: A transmitter is disclosed for transmitting a digital information signal via a transmission medium. The digital information signal can be divided into one or more sub-signals. Each sub-signal is transmitted as a non-encoded or as an encoded signal. In which way the sub-signal is transmitted depends on the compression that can be achieved by the encoder. If the compression is low the sub-signal is transmitted in non-encoded form. For the receiver an identification is added to the composite signal to be transmitted. A first component of the identification signal indicates if one or more sub-signals are transmitted in encoded form. A second component of the identification signal indicates for each sub-signal whether it appears in encoded or non-encoded form in the composite signal. The invention provides a composite signal with a minimal number of bits.

Abstract translation: 公开了用于经由传输介质发送数字信息信号的发射器。 数字信息信号可以被分成一个或多个子信号。 每个子信号作为非编码信号或编码信号发送。 以这种方式发送子信号取决于编码器可以实现的压缩。 如果压缩较低，则以非编码形式发送子信号。 对于接收机，将要发送的复合信号添加识别。 识别信号的第一分量指示是否以编码形式发送一个或多个子信号。 识别信号的第二分量表示每个子信号是否以复合信号中的编码或非编码形式出现。 本发明提供具有最少位数的复合信号。

公开(公告)号：WO99057912A2

公开(公告)日：1999-11-11

申请号：PCT/IB1999/000750

申请日：1999-04-26

IPC: H03D3/00 ,  H04L27/14 ,  H04L27/22 ,  H04Q

CPC classification number: H03D3/008 ,  H04L27/142

Abstract: The present invention provides dc offset compensation circuit (800) for a zero IF FM quadrature demodulator in an AMPS cellular mobile telephone system. A frequency offset is introduced to remove modulation inherent dc components from supervisory audio tones and Manchester codes from a modulated signal. The local oscillator (608) is operated at a frequency that is slightly different, e.g. 5 kHz from a frequency which would mix down the intermediate frequency signal to zero. A dc offset is produced with a control loop to eliminate fixed dc components caused by leakage from a local oscillator (608). After a given time, the control loop may be frozen and the frequency offset of the local oscillator (608) can be removed.

Abstract translation: 本发明提供一种用于AMPS蜂窝移动电话系统中的零IF FM正交解调器的直流偏移补偿电路（800）。 引入频率偏移以从调制信号中去除监控音频音调和曼彻斯特码中的调制固有直流分量。 本地振荡器（608）以略微不同的频率操作，例如， 从将中频信号混合到零的频率5 kHz。 通过控制回路产生直流偏移，以消除由本地振荡器的泄漏引起的固定直流分量（608）。 在给定时间之后，控制环路可能被冻结，并且可以去除本地振荡器（608）的频率偏移。