公开(公告)号：WO2004098099A1

公开(公告)日：2004-11-11

申请号：PCT/EP2004/003780

申请日：2004-04-08

Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (publ) ,  JONSSON, Elias ,  ERICSSON, Anders

Inventor： JONSSON, Elias ,  ERICSSON, Anders

IPC: H04B01/707

CPC classification number: H04B1/712 ,  H04B1/7117

Abstract: Methods of scaling path delay values in a communication system, in which estimates of received symbols corresponding to the path delays are combined, include the step of determining a respective weight value for each path delay based on relative correlations of the path delays. The weight values may be determined by getting a plurality of path delay values (301); identifying the path delay values as either peak values or neighbor values (302); organizing the peak values and neighbor values into groups, with each group including at least one peak value and at least one neighbor value (303); for each group, determining a set of weight (values304); and checking the groups for duplicated path delay values and selecting a weight value from the weight values determined for the duplicated path delay values as either one of the weight values for the duplicated path delay values or a combination of the weight values for the duplicated path delay values (305). Receivers in digital communication systems and computer-readable media are also disclosed.

Abstract translation: 在其中组合对应于路径延迟的接收符号的估计的通信系统中缩放路径延迟值的方法包括基于路径延迟的相对相关性确定每个路径延迟的相应权重值的步骤。 权重值可以通过获得多个路径延迟值（301）来确定; 将路径延迟值识别为峰值或相邻值（302）; 将峰值和相邻值组织成组，每组包括至少一个峰值和至少一个相邻值（303）; 确定一组重量（值304）; 并且检查组中的重复路径延迟值，并从为复制路径延迟值确定的权重值中选择权重值作为复制路径延迟值的权重值之一或复制路径延迟的权重值的组合 值（305）。 还公开了数字通信系统和计算机可读介质中的接收机。

公开(公告)号：WO1998011676A2

公开(公告)日：1998-03-19

申请号：PCT/SE1997001494

申请日：1997-09-05

Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (publ)

Inventor： TELEFONAKTIEBOLAGET LM ERICSSON (publ) ,  SCHRAMM, Peter ,  HUBER, Johannes

IPC: H04B01/707

CPC classification number: H04B1/707

Abstract: Methods and apparatus for demodulating a received communication signal employing coherent demodulation and decision-directed channel estimation are disclosed that have a significant gain compared to a receiver employing noncoherent demodulation. This is particularly so for spread spectrum communication systems such as the uplink specified by the TIA/EIA/IS-95 mobile communication standard, in which an orthogonal modulation scheme combined with convolutional coding and interleaving is used. The coherent demodulation methods and apparatus do not require a pilot signal, and thus can be used in communication systems that are originally designed for use of noncoherent demodulation.

Abstract translation: 公开了使用相干解调和决策导频信道估计来解调接收到的通信信号的方法和装置，其与使用非相干解调的接收机相比具有显着的增益。 这对于使用与卷积编码和交织相结合的正交调制方式的TIA / EIA / IS-95移动通信标准规定的上行链路等扩频通信系统尤其如此。 相干解调方法和装置不需要导频信号，因此可以用于最初设计用于非相干解调的通信系统中。

公开(公告)号：WO1998008312A1

公开(公告)日：1998-02-26

申请号：PCT/SE1997001334

申请日：1997-08-08

Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (publ)

Inventor： TELEFONAKTIEBOLAGET LM ERICSSON (publ) ,  KARLSSON, Jonas ,  TEDER, Paul ,  EWERBRING, Lars-Magnus

IPC: H04B01/707

CPC classification number: H04B1/707

Abstract: A receiver device (703) downspreads signals from a band spreading signal, which generates downspread symbol sequences (803). A vector generator (704) generates symbol vectors (805) which include a symbol from each downspread symbol sequence (803). An auxiliary receiver (705) detects symbol vectors (805) in a first window (809) with the length of one symbol time. The auxiliary receiver (705) generates provisional estimates of the symbol vectors (805) with the help of a device with a first window algorithm (811). A delaying module (706) delays the symbol vectors (805) from the vector generator (704) by one symbol time before they reach a main receiver (707). The main receiver (707) detects in a second window (806) the symbol vectors (805) with the length of one symbol time. The main receiver (707) uses a device with a second window algorithm (808) in order to estimate the received symbol vectors (805) with reference taken to the previously estimated symbol vectors in the main receiver (705) and the provisional estimates of the symbol vectors (805) from the auxiliary receiver (705). A component generator (710) divides up the estimated symbol vectors (807) from the main receiver into separate components (815).

Abstract translation: 接收机设备（703）对从扩频符号序列（803）产生的频带扩展信号中的信号进行扩展。 向量生成器（704）生成包括来自每个向下扩展符号序列（803）的符号的符号向量（805）。 辅助接收器（705）在一个符号时间的长度的第一窗口（809）中检测符号向量（805）。 辅助接收机（705）利用具有第一窗口算法（811）的设备的帮助产生符号向量（805）的临时估计。 延迟模块（706）在向量生成器（704）到达主接收器（707）之前延迟一个符号时间的符号向量（805）。 主接收机（707）在第二窗口（806）中检测具有一个符号时间的长度的符号向量（805）。 主接收机（707）使用具有第二窗口算法（808）的设备，以便参考主接收机（705）中的先前估计的符号向量来估计接收到的符号向量（805），并且 来自辅助接收器（705）的符号向量（805）。 分量生成器（710）将估计的符号矢量（807）从主接收机分成单独的分量（815）。

公开(公告)号：WO1998002973A1

公开(公告)日：1998-01-22

申请号：PCT/US1997013117

申请日：1997-07-03

Applicant: GENERAL ELECTRIC COMPANY ,  HARRISON, Daniel, David ,  TIEMANN, Jerome, Johnson

Inventor： GENERAL ELECTRIC COMPANY

IPC: H04B01/707

CPC classification number: H04B1/708 ,  G01S5/0027 ,  G01S5/0036 ,  G01S5/0054 ,  G01S19/29 ,  G01S19/30 ,  G01S19/34 ,  G01S19/37 ,  G01S19/42 ,  G06F17/15 ,  H04B1/707 ,  H04B1/71075 ,  H04B2201/70709 ,  H04W52/0283 ,  Y02D70/164 ,  Y02D70/40

Abstract: A direct sequence spread spectrum receiver samples an incoming signal and stores the sample in memory. Prior to sampling and storage, the incoming signal is translated to an IF signal. Also prior to storage, the IF signal is corrected for a frequency offset signal. The frequency offset may be caused by many sources, Doppler shift or local oscillator error, for example. Once the signal is corrected for the frequency offset, the signal sample is stored in memory. The signal sample is read from memory as necessary to process the signal. Such a receiver is useful in global positioning satellite (GPS) signal processing where the incoming signal contains several satellite transmissions encoded with CDMA encoding.

Abstract translation: 直接序列扩频接收机对输入信号进行采样并将样本存储在存储器中。 在采样和存储之前，输入信号被转换为IF信号。 同样在存储之前，针对频率偏移信号校正IF信号。 频率偏移可能由许多来源引起，例如多普勒频移或本地振荡器误差。 一旦对频率偏移校正了信号，信号样本将被存储在存储器中。 根据需要从存储器读取信号采样以处理信号。 这样的接收机在全球定位卫星（GPS）信号处理中是有用的，其中输入信号包含用CDMA编码编码的几个卫星传输。

公开(公告)号：WO1997006609A1

公开(公告)日：1997-02-20

申请号：PCT/CA1996000428

申请日：1996-06-26

Applicant: NORTHERN TELECOM LIMITED

Inventor： NORTHERN TELECOM LIMITED ,  LI, Gang ,  WANG, Rui ,  TROFIMOV, Iouri ,  CHLOMA, Alexandre ,  BAKOULINE, Mikhail ,  KREINDELINE, Vitali

IPC: H04B01/707

CPC classification number: H04B1/70752 ,  H04B1/70753 ,  H04J13/0022

Abstract: A method is disclosed for synchronizing, in the presence of sign ambiguity, to a pseudo random maximal length sequence having a characteristic polynomial of order k with a coefficients vector A given by: A = [1 a1 a2 ... ak-1 1] where each of the coefficients a1 to ak-1 is 1 for an intermediate tap location and otherwise is 0. A received symbol sequence is supplied to and shifted through a K = k + 1 stage shift register with P intermediate taps in positions determined by a coefficeints vector Ain given by: Ain = [1 a 1 (a1Oa2) (a2Oa3) ... (ak-2Oak-1) a k-1 1] where a 1 and a k-1 are the inverse of a1 and ak-1 respectively and O denotes a modulo-2 sum, whereby the shift register has P intermediate taps where P is a positive integer less than K. A respective correlation signal is recursively added at an input for the received symbol sequence and at each intermediate tap. Each correlation signal is produced by correlating the P + 1 signals from said input, intermediate taps, and output other than the signal to which the respective correlation signal is added. The invention is particularly applicable to pilot synchronization in CDMA terminals.

Abstract translation: 公开了一种用于在符号歧义存在的情况下同步具有具有由下式给出的系数向量A的具有阶数k的特征多项式的伪随机最大长度序列的方法：A = [1 a1 a2 ... ak-1 1] 其中对于中间抽头位置，系数a1至ak-1中的每个系数为1，否则为0.接收到的符号序列被提供给K = k + 1级移位寄存器并通过P中间抽头在由a 系数矢量Ain由以下公式给出：Ain = [1 1（a1Oa2）（a2Oa3）...（ak-2Oak-1） ak-1 1] 分别是a1和ak-1的倒数，O表示模2和，由此移位寄存器具有P个中​​间抽头，其中P是 一个小于K的正整数。相应的相关信号在接收到的符号序列的输入端和每个中间抽头递归地相加。 每个相关信号是通过将来自所述输入的P + 1信号，中间抽头以及除相关相关信号的信号之外的输出相关而产生的。 本发明特别适用于CDMA终端中的导频同步。

公开(公告)号：WO1997005709A1

公开(公告)日：1997-02-13

申请号：PCT/US1996012531

申请日：1996-07-31

Applicant: QUALCOMM INCORPORATED

Inventor： QUALCOMM INCORPORATED ,  ROSS, Arthur

IPC: H04B01/707

CPC classification number: H04B1/7097 ,  H04L25/03038 ,  H04L2025/03375 ,  H04L2025/03477 ,  H04L2025/03617

Abstract: A method and apparatus for adaptively despreading a direct sequence spread spectrum signal. The direct sequence spread spectrum signal is provided to transversal filter (101). The output of filter (101) is despread by despreader (120) to provide a soft symbol determined by symbol estimator (122). The soft symbol is provided to decision circuit (124) which generates an error corrected version of the soft symbol data, referred to as a hard symbol. The value of the hard symbol is subtracted from the soft symbol by subtractor (126) to generate an error symbol. The error symbol is then used to compute tap values of the transversal filter by means of an LMS algorithm employed by tap adapter (103).

Abstract translation: 一种用于自适应地解扩直接序列扩频信号的方法和装置。 直接序列扩频信号被提供给横向滤波器（101）。 滤波器（101）的输出由解扩器（120）解扩，以提供由符号估计器（122）确定的软符号。 软符号被提供给判定电路（124），该电路产生称为硬符号的软符号数据的纠错版本。 通过减法器（126）从软符号中减去硬符号的值以产生错误符号。 然后使用误差符号通过抽头适配器（103）采用的LMS算法来计算横向滤波器的抽头值。

公开(公告)号：WO1997005707A1

公开(公告)日：1997-02-13

申请号：PCT/DE1996001368

申请日：1996-07-24

Applicant: SIEMENS AKTIENGESELLSCHAFT ,  RITTER, Gerhard

Inventor： SIEMENS AKTIENGESELLSCHAFT

IPC: H04B01/707

CPC classification number: H04B1/7105

Abstract: In order to reduce common channel interference in the receivers of base and subscriber stations of a cellular radio system in which radio cells with radio channels of the same frequency are used and signals are transmitted by the so-called JD-CDMA process (joint detection-code division multiple access), so that a plurality of connections is processed in parallel in the same HF band, the useful signals are provided each with a different spread code and are spread by a determined factor around the frequency axis and are decoded again at the receiving site by using said spread code. In the receivers of a radio cell, the spread codes of at least another radio cell that uses the same frequency band are at least partially taken into account during decoding. The invention may be used with future CDMA mobile radio systems.

Abstract translation: 本发明用于减少在其中无线小区与相同频率的无线电信道，并使用所谓的JD-CDMA的信号的传输（联合检测使用一个蜂窝式无线电系统的基地和用户站的接收设备的同信道干扰 - 码分多址=码复用 与相关联的检测）方法，其中多个在相同的RF频带的用户连接的并行处理，为此目的，该有用信号与相应的不同传播按特定因子在频率轴上再次使用这个扩频码进行扩展和解码的接收位置进行 ， 在各个接收设备的无线电小区进行解码时至少部分的扩频码的都考虑到，这是在至少一个其它中，相同的频带使用的无线电小区中使用。 本发明可以在未来的CDMA移动通信系统中。

公开(公告)号：WO1996038929A1

公开(公告)日：1996-12-05

申请号：PCT/US1996008495

申请日：1996-06-03

Applicant: DSC COMMUNICATIONS CORPORATION

Inventor： DSC COMMUNICATIONS CORPORATION ,  YEUNG, Joemanne, Chi, Cheung ,  COOPER, Ian, Leslie

IPC: H04B01/707

CPC classification number: H04W56/00 ,  G06F9/546 ,  H04B1/707 ,  H04B1/70735 ,  H04B1/7075 ,  H04B1/7077 ,  H04B1/70775 ,  H04B1/7085 ,  H04B2001/70706 ,  H04B2201/70702 ,  H04B2201/70706 ,  H04B2201/7071 ,  H04B2201/70711 ,  H04B2201/709709 ,  H04J3/0682 ,  H04J13/00 ,  H04L9/065 ,  H04L9/12 ,  H04L12/66 ,  H04L29/06 ,  H04L41/0226 ,  H04L41/0233 ,  H04L41/0816 ,  H04L41/22 ,  H04L43/00 ,  H04L69/08 ,  H04L69/14 ,  H04L2209/80 ,  H04Q11/04 ,  H04Q2213/1305 ,  H04Q2213/13093 ,  H04Q2213/13098 ,  H04Q2213/13109 ,  H04Q2213/1319 ,  H04Q2213/13196 ,  H04Q2213/13199 ,  H04Q2213/13202 ,  H04Q2213/13204 ,  H04Q2213/13216 ,  H04Q2213/13292 ,  H04Q2213/13296 ,  H04Q2213/13298 ,  H04Q2213/13299 ,  H04Q2213/13335 ,  H04Q2213/13376 ,  H04W52/04 ,  H04W52/08 ,  H04W52/24 ,  H04W52/52 ,  H04W84/14

Abstract: A downlink communication path is established from a transmitter (200) of the central terminal (10) to a receiver (202) of the subscriber terminal (20). A downlink signal (212) is transmitted from the transmitter (200) to the receiver (202) during setup and operation of the wireless telecommunications system (1). The downlink signal (212) includes an overhead channel (224) having a code synchronization signal (234). The code synchronization signal (234) is capable of adjusting a phase of a transmitter (204) in the subscriber terminal (20). A receiver (206) in the central terminal (10) monitors an uplink signal (214) transmitted by the transmitter (204) in the subscriber terminal and provides changes to the code synchronization signal (234) such that the transmitter (204) is synchronized to the receiver (206). Synchronization of the transmitter (204) in the subscriber terminal (20) to the receiver (206) in the central terminal (10) facilitates establishment of an uplink communication path from the subscriber terminal (20) to the central terminal (10).

Abstract translation: 从中心终端（10）的发射机（200）到用户终端（20）的接收机（202）建立下行链路通信路径。 在无线电信系统（1）的建立和操作期间，从发射机（200）向接收机（202）发送下行链路信号（212）。 下行链路信号（212）包括具有码同步信号（234）的开销信道（224）。 代码同步信号（234）能够调整用户终端（20）中的发射机（204）的相位。 中央终端（10）中的接收机（206）监视由用户终端中的发射机（204）发送的上行链路信号（214），并提供对码同步信号（234）的改变，使得发射机（204）同步 到接收器（206）。 用户终端（20）中的发射机（204）与中心终端（10）中的接收机（206）的同步有助于建立从用户终端（20）到中心终端（10）的上行链路通信路径。

公开(公告)号：WO1996022661A3

公开(公告)日：1996-07-25

申请号：PCT/US1996000141

申请日：1996-01-03

Applicant: QUALCOMM INCORPORATED

Inventor： QUALCOMM INCORPORATED ,  ZEHAVI, Ephraim ,  CARTER, Stephen, S. ,  GILHOUSEN, Klein, S.

IPC: H04B01/707

公开(公告)号：WO1995022859A1

公开(公告)日：1995-08-24

申请号：PCT/US1995001421

申请日：1995-02-03

Applicant: MICRILOR, INC.

Inventor： MICRILOR, INC. ,  CAFARELLA, John, H. ,  FISCHER, Jeffrey, H.

IPC: H04B01/707

CPC classification number: H04B1/711 ,  H04B1/707 ,  H04B2201/709709 ,  H04J13/0048 ,  H04J13/102 ,  H04W84/12

Abstract: An apparatus and method for communicating data between at least two data devices, suitable for use as a wireless local-area network, that provides robust data communication via a radio communication channel corrupted by multipath interference, particularly at high data rates. A preferred embodiment of the invention represents data as a sequence of Walsh-function waveforms (66) encoded by pseudo-noise direct-sequence spread-spectrum modulation (70). Walsh function encoding of the data provides a long symbol duration, thereby allowing the spread spectrum modulation to provide processing gain sufficient to substantially overcome multipath interference, while providing a high data rate.

Abstract translation: 一种用于在至少两个适合用作无线局域网的数据设备之间传送数据的装置和方法，该数据设备经由由多路径干扰（特别是在高数据速率）损坏的无线电通信信道提供鲁棒的数据通信。 本发明的优选实施例将数据表示为由伪噪声直接序列扩频调制（70）编码的沃尔什函数波形序列（66）。 数据的沃尔什函数编码提供长的符号持续时间，从而允许扩展频谱调制提供足以实质上克服多径干扰的处理增益，同时提供高数据速率。