公开(公告)号：US20040114556A1

公开(公告)日：2004-06-17

申请号：US10603421

申请日：2003-06-24

Inventor： David S. Miller ,  Leonard Norman Schiff

IPC: H04B007/216

CPC classification number: H04B7/216 ,  H04B2201/70702 ,  H04W56/0035 ,  H04W56/0045 ,  H04W92/10

Abstract: A technique for realizing code synchronism to enable the application of modulation codes needed for implementing orthogonal CDMA modulation for reverse link communications. In a satellite communications system using orthogonal CDMA in the reverse link, a ground station transmits a first pilot signal in the forward link direction, which is acquired and tracked by a terminal or remote station, and used in recovering carrier phase and modulation chip clock timing. The terminal then derives a transmission carrier frequency and chip clock timing to be used, from the recovered forward pilot carrier frequency and chip clock timing. The terminal transmits a second pilot signal in the reverse link direction which, after being received and retransmitted by a satellite, is detected at the ground station. Terminals have the ability to advance or retard the timing of their signals for transmission relative to the timing derived from the forward link pilot signal. The ground station tracks timing, and in some embodiments also tracks frequency, of the terminal pilot signal, and compares these parameters to a reverse link reference signal. Based at least in part on the results of the comparison, the ground station transmits a control signal on the forward link to each terminal, thereby commanding the terminal to advance or retard its respective transmission timing. Each terminal then adjusts its transmission timing and/or frequency in small increments to maintain a desired level of time alignment with the ground station.

Abstract translation: 一种用于实现代码同步以实现用于实现用于反向链路通信的正交CDMA调制所需的调制码的技术。 在反向链路中使用正交CDMA的卫星通信系统中，地面站在前向链路方向上发送由终端或远程站获取和跟踪的第一导频信号，并用于恢复载波相位和调制芯片时钟定时 。 然后，终端从恢复的前向导频载波频率和芯片时钟定时导出要使用的传输载波频率和码片时钟定时。 终端在地面站检测到卫星接收和重传后的反向链路方向上发送第二导频信号。 终端具有相对于从前向链路导频信号导出的定时，推进或延迟用于传输的信号的定时的能力。 地面站跟踪终端导频信号的定时，并且在一些实施例中也跟踪频率，并将这些参数与反向链路参考信号进行比较。 至少部分地基于比较的结果，地面站在前向链路上发送控制信号到每个终端，从而命令终端推进或延迟其各自的发送定时。 然后每个终端以小增量调整其发射定时和/或频率，以保持与地面站的时间对准所需的水平。

公开(公告)号：US06728203B2

公开(公告)日：2004-04-27

申请号：US09859535

申请日：2001-05-18

Applicant: Yi-Pin Eric Wang

Inventor： Yi-Pin Eric Wang

IPC: H04J1100

CPC classification number: H04B1/7075 ,  H04B1/7087 ,  H04B7/0845 ,  H04B2201/70702 ,  H04L2027/0065

Abstract: A system searches for a cell and determines a frequency error estimate in a communications network. The system generates a slot boundary candidate. The system identifies a scrambling code group using the slot boundary list, identifies a scrambling code from the scrambling code group, and determines a frequency error estimate using the identified scrambling code. The system also determines a detection metric, compares the detection metric to a predetermined threshold, and selects the frequency error estimate when the detection metric is greater than the predetermined threshold.

Abstract translation: 系统搜索小区并确定通信网络中的频率误差估计。 系统生成槽边界候选。 该系统使用时隙边界列表识别扰码组，从加密码组识别扰码，并使用所识别的扰码确定频率误差估计。 系统还确定检测度量，将检测度量与预定阈值进行比较，并且当检测度量大于预定阈值时选择频率误差估计。

公开(公告)号：US06721301B2

公开(公告)日：2004-04-13

申请号：US09765016

申请日：2001-01-18

Applicant: Fatih M. Ozluturk ,  Gary R. Lomp

Inventor： Fatih M. Ozluturk ,  Gary R. Lomp

IPC: H04B7216

CPC classification number: H04B7/2637 ,  G06F13/374 ,  H03H17/0226 ,  H03H17/06 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/70753 ,  H04B1/70754 ,  H04B1/70755 ,  H04B1/70758 ,  H04B1/7077 ,  H04B1/708 ,  H04B1/7085 ,  H04B1/709 ,  H04B1/7093 ,  H04B1/711 ,  H04B1/7115 ,  H04B1/712 ,  H04B7/2628 ,  H04B7/264 ,  H04B2201/70701 ,  H04B2201/70702 ,  H04B2201/70703 ,  H04B2201/70707 ,  H04B2201/7071 ,  H04J13/00 ,  H04J13/004 ,  H04J13/0048 ,  H04J13/0077 ,  H04J13/10 ,  H04J13/107 ,  H04J13/12 ,  H04J13/16 ,  H04J2013/0037 ,  H04L1/0001 ,  H04L1/004 ,  H04L1/0042 ,  H04L1/0047 ,  H04L1/0054 ,  H04L1/0059 ,  H04L5/1446 ,  H04L25/0212 ,  H04L27/206 ,  H04L27/2332 ,  H04L2027/003 ,  H04L2027/0053 ,  H04N1/00912 ,  H04N1/3333 ,  H04N2201/3335 ,  H04W52/04 ,  H04W52/08 ,  H04W52/143 ,  H04W52/146 ,  H04W52/24 ,  H04W52/241 ,  H04W52/245 ,  H04W52/247 ,  H04W52/26 ,  H04W52/262 ,  H04W52/322 ,  H04W52/325 ,  H04W52/343 ,  H04W52/346 ,  H04W52/36 ,  H04W52/367 ,  H04W52/44 ,  H04W52/50 ,  H04W52/52 ,  H04W52/54 ,  H04W52/60 ,  Y02D10/14

Abstract: An improvement for a method and system for tracking a spreading code, used in a code division multiple access (CDMA) system. An input signal has spread-spectrum modulation. The spreading code embedded in the spread-spectrum modulation has a plurality of chips. The input signal is sampled, and half-chip offset samples are formed from the sampled input signal. An even set of the half-chip offset samples are grouped into an early set of samples, and an odd set of the half-chip offset samples are grouped into a late set of samples. Each early set of samples is multiplied by spreading codes c(n+1), c(n+2), . . . , c(n+L), to generate a first plurality of products. L is approximately equal to the number of chips of delay between the earliest and latest multipath signals. A first plurality of sums and magnitudes are computed from the first plurality of products. The first plurality of magnitudes are multiplied by a first plurality of weights, to generate a first plurality of weighted-signal values. The first plurality of weighted-signal values are summed to generate an early signal-energy value. Each late set of samples is multiplied by spreading codes c(n−1), c(n−2), . . . , c(n−L), to generate a second plurality of products. A second plurality of sums and magnitudes are computed from the second plurality of products. The second plurality of magnitudes are multiplied by a second plurality of weights, to generated a second plurality of weighted-signal values. The second plurality of weighted-signal values are summed to generate a late signal-energy value. A difference is calculated between the early signal-energy value and the late signal-energy value, thereby producing an error signal.

Abstract translation: 用于跟踪在码分多址（CDMA）系统中使用的扩展码的方法和系统的改进。 输入信号具有扩频调制。 嵌入在扩频调制中的扩展码具有多个码片。 对输入信号进行采样，并从采样输入信号形成半码片偏移采样。 半组合偏移样本的偶数组被分组为早期采样集合，并且半组合偏移样本的奇数组被分组为后期样本集合。 每个早期的样本集合乘以扩展码c（n + 1），c（n + 2）。 。 。 ，c（n + L），以产生第一多个产品。 L近似等于最早和最新的多径信号之间的延迟码片数。 从第一多个产品中计算出第一多个和值和量值。 第一多个量值乘以第一多个权重，以产生第一多个加权信号值。 将第一组多个加权信号值相加以产生早期信号能量值。 每个后期的样本集合乘以扩展码c（n-1），c（n-2）。 。 。 ，c（n-L），以产生第二多个产品。 从第二多个产品中计算第二个数量和的数量。 第二多个量值乘以第二多个权重，以产生第二多个加权信号值。 将第二多个加权信号值相加以产生后期信号能量值。 在早期的信号能量值和后期的信号能量值之间计算出差异，从而产生误差信号。

公开(公告)号：US06697629B1

公开(公告)日：2004-02-24

申请号：US09689265

申请日：2000-10-11

Applicant: Francesco Grilli ,  Serge Willenegger

Inventor： Francesco Grilli ,  Serge Willenegger

IPC: H04Q720

CPC classification number: H04W64/00 ,  G01S5/10 ,  H04B1/7117 ,  H04B2201/70701 ,  H04B2201/70702

Abstract: Techniques to more accurately measure the arrival times of transmissions received at a remote terminal from a number of base stations. In one aspect, unassigned finger processors are used to process and measure the arrival times of transmissions from base stations not in the active set. In another aspect, if no finger processors are available for assignment, the arrival times can be measured in the time period between updates of a reference oscillator used for the measurements. In accordance with a method for determining a position of a remote terminal, a first set of one or more base stations in active communication with the remote terminal is identified and each base station in the first set is assigned at least one finger processor. A second set of one or more base stations not in active communication with the remote terminal is also identified and an available finger processor is assigned to each of at least one base station in the second set. A (signal arrival) time measurement is then performed for each base station, and outputs indicative of the measurements are provided for further processing. To improve accuracy, the measurements can be performed within a narrow time window.

Abstract translation: 从多个基站更准确地测量在远程终端接收的传输的到达时间的技术。 在一个方面，未分配的手指处理器用于处理和测量来自不在活动集合中的基站的传输的到达时间。 在另一方面，如果没有手指处理器可用于分配，则可以在用于测量的参考振荡器的更新之间的时间段内测量到达时间。 根据用于确定远程终端的位置的方法，识别与远程终端主动通信的一个或多个基站的第一组，并且为第一组中的每个基站分配至少一个手指处理器。 还识别出与远程终端未主动通信的第二组一个或多个基站，并且将可用的手指处理器分配给第二组中的至少一个基站中的每一个。 然后对每个基站执行A（信号到达）时间测量，并且提供指示测量的输出用于进一步处理。 为了提高精度，可以在狭窄的时间窗内进行测量。

公开(公告)号：US06697622B1

公开(公告)日：2004-02-24

申请号：US09655122

申请日：2000-09-05

Applicant: Yoshihiro Ishikawa ,  Seizo Onoe ,  Kazufumi Yunoki ,  Akihiro Higashi

Inventor： Yoshihiro Ishikawa ,  Seizo Onoe ,  Kazufumi Yunoki ,  Akihiro Higashi

IPC: H04Q720

CPC classification number: H04W36/0083 ,  H04B1/70735 ,  H04B1/7083 ,  H04B2201/70702 ,  H04W48/16 ,  H04W48/20 ,  H04W52/0216 ,  Y02D70/164 ,  Y02D70/20 ,  Y02D70/40

Abstract: A control method of searching for a neighboring cell of a mobile station communicating with a base station is provided in a direct sequence CDMA mobile communication system which transmits information by carrying out double modulation using a first spreading code group and a second spreading code. The first spreading code group includes spreading codes that have a same repetition period as an information symbol period and are used in common by the base stations, and the second spreading code has a repetition period longer than the information symbol period. The base stations are assigned different second spreading codes. The control method stores at least one second spreading code and its phase into a first table, which second spreading code corresponds to a perch channel whose second spreading code and phase are known; stores a second spreading code used by a neighboring base station into a second table; searches for a perch channel whose second spreading code and phase are unknown; and searches for a perch channel whose second spreading code and phase are known. The neighboring cell search method can save the power consumption and time required for the mobile station to carry out the cell search with preventing an increase in the total cost of the system.

Abstract translation: 在通过使用第一扩展码组和第二扩展码进行双重调制来发送信息的直接序列CDMA移动通信系统中，提供了搜索与基站通信的移动台的相邻小区的控制方法。 第一扩展码组包括与信息符号周期具有相同重复周期的扩展码，并且由基站共同使用，并且第二扩展码具有比信息符号周期长的重复周期。 基站被分配不同的第二扩展码。 控制方法将至少一个第二扩展码及其相位存储在第一表中，该第二扩展码对应于其第二扩展码和相位已知的导频信道; 将相邻基站使用的第二扩展码存储到第二表中; 搜索其第二扩频码和相位未知的导频信道; 并搜索其第二扩展码和相位是已知的导频信道。 相邻小区搜索方法可以节省移动台执行小区搜索所需的功耗和时间，从而防止系统总成本的增加。

公开(公告)号：US06667962B1

公开(公告)日：2003-12-23

申请号：US09553189

申请日：2000-04-20

Applicant: Jeong-Goo Lee ,  Seok-Jin Ham

Inventor： Jeong-Goo Lee ,  Seok-Jin Ham

IPC: H04J1300

CPC classification number: H04W36/16 ,  H04B2201/70701 ,  H04B2201/70702 ,  H04M3/42 ,  H04W84/042

Abstract: A novel mobile station for a CDMA system does not repeat initial pilot acquisition, when a call is abnormally released. The mobile station performs energy measurement on PN offset values of the neighbor base stations, received from the previous service base station, to determine a reference active sector. Based on whether the determined sector is identical to the previous reference active sector, call re-origination is performed from the sync channel state or the paging channel state. Accordingly, the user shouldn't have to redial and wait for a long time until the call re-origination is performed successfully. In addition, the mobile station does not need to perform initial pilot acquisition unnecessarily, and can reduce the time required for recovering the dropped call.

Abstract translation: 当呼叫异常释放时，用于CDMA系统的新型移动站不重复初始导频获取。 移动台对从先前服务基站接收到的邻近基站的PN偏移值执行能量测量，以确定参考活动扇区。 基于确定的扇区是否与先前的参考活动扇区相同，从同步信道状态或寻呼信道状态执行呼叫重发。 因此，用户不必重拨并等待很长时间，直到成功执行呼叫重新发送。 此外，移动台不需要不必要地执行初始导频获取，并且可以减少恢复掉话所需的时间。

公开(公告)号：US20030227890A1

公开(公告)日：2003-12-11

申请号：US10452280

申请日：2003-06-03

Applicant: NEC ELECTRONICS CORPORATION

Inventor： Ayumi Izumida

IPC: H04B007/216

CPC classification number: H04B1/70735 ,  H04B2201/70702

Abstract: The method of this invention for preparing a profile in W-CDMA which, using a timer value and norm value, helps a mobile unit to synchronize its signals with those of a base station, comprising providing a profile data preparing portion which cumulatively adds a new norm value to a previous cumulative value fetched from a profile memory to cause the result to be stored as a current cumulative value in a profile memory and repeat the same cumulative addition each time a new norm value is fed to said portion; furnishing the profile data preparing portion with an overflow detection ability to detect the overflow of the profile memory; and choosing, when the overflow of the profile memory is detected, a maximum writable value of the profile memory, and causing the profile memory to store said maximum writable value as a current cumulative value.

Abstract translation: 本发明的用于在W-CDMA中准备简档的方法，其使用定时器值和范数值帮助移动单元将其信号与基站的信号同步，包括提供简档数据准备部分，其累积地添加新的 范数值与从简档存储器提取的先前累积值相关联，以使结果作为当前累积值存储在简档存储器中，并且每当将新的范数值馈送到所述部分时重复相同的累积加法; 提供具有溢出检测能力的简档数据准备部分，以检测简档存储器的溢出; 以及当检测到所述简档存储器的溢出时，选择所述简档存储器的最大可写值，并且使所述简档存储器将所述最大可写值存储为当前累积值。

公开(公告)号：US20030223476A1

公开(公告)日：2003-12-04

申请号：US10412576

申请日：2003-04-14

Applicant: GOLDEN BRIDGE TECHNOLOGY, INC.

Inventor： Emmanuel Kanterakis ,  Kourosh Parsa

IPC: H04B001/707

CPC classification number: H04B1/7075 ,  H04B1/707 ,  H04B7/2668 ,  H04B2201/70701 ,  H04B2201/70702 ,  H04J11/0069 ,  H04W4/06 ,  H04W24/00 ,  H04W52/325 ,  H04W52/362 ,  H04W52/367 ,  H04W52/48 ,  H04W56/00 ,  H04W74/00

Abstract: An improvement to a code-division-multiple-access (CDMA) system employing spread-spectrum modulation, with the CDMA system having a base station (BS) and a plurality of remote stations. The base station has a BS-spread-spectrum transmitter and a BS-spread-spectrum receiver. A remote station has an RS-spread-spectrum transmitter and an RS-spread-spectrum receiver. The BS transmitter transmits a broadcast common-synchronization channel, which includes a frame-timing signal. The broadcast common-synchronization channel has a common chip-sequence signal, which is common to the plurality of remote stations. In response to the RS-spread-spectrum receiver receiving the broadcast common-synchronization channel, and determining frame timing from the frame-timing signal, an RS-spread-spectrum transmitter transmits an access-burst signal. The access-burst signal includes a collision-detection portion. In response to the BS-spread-spectrum receiver receiving the access-burst signal, the BS-spread-spectrum transmitter transmits an collision-detection signal with the collision detection portion. In response to the BS-spread-spectrum receiver not receiving the access-burst signal due to a collision with a collision access-burst signal, the BS-spread-spectrum transmitter transmits an collision-detection signal without the correct collision detection portion.

Abstract translation: 对CDMA系统具有基站（BS）和多个远程站的采用扩频调制的码分多址（CDMA）系统的改进。 基站具有BS扩频发射机和BS扩频接收机。 远程站具有RS扩频发射机和RS扩频接收机。 BS发射机发送包括帧定时信号的广播公共同步信道。 广播共同同步信道具有公共芯片序列信号，这是多个远程站所共有的信号。 响应于接收广播公共同步信道的RS扩频接收机，并根据帧定时信号确定帧定时，RS扩频发射机发送接入突发信号。 接入突发信号包括冲突检测部分。 响应于接收到接入突发信号的BS扩频接收机，BS扩频发射机与冲突检测部分发送冲突检测信号。 响应于由于与冲突接入突发信号的冲突而没有接收到接入突发信号的BS扩频接收机，BS扩频发射机发送没有正确的冲突检测部分的冲突检测信号。

公开(公告)号：US20030174760A1

公开(公告)日：2003-09-18

申请号：US09255032

申请日：1999-02-22

Inventor： ROLAND R. RICK ,  BRIAN C. BANISTER ,  MARK DAVIS

IPC: H04B001/707

CPC classification number: H04B1/707 ,  H04B2201/70702 ,  H04B2201/70709

Abstract: A method and apparatus for searching for neighboring base stations by waking from a power-saving sleep mode to receive an incoming signal. The incoming signal is received and at least a portion of the incoming signal is stored. The stored information signal is then processed with each of several different codes to determine a power level corresponding to each of the different codes.

Abstract translation: 一种用于通过从省电休眠模式唤醒以接收输入信号来搜索相邻基站的方法和装置。 输入信号被接收并且至少一部分输入信号被存储。 然后利用几个不同的代码中的每一个处理所存储的信息信号，以确定与每个不同代码对应的功率电平。

公开(公告)号：US20030152174A1

公开(公告)日：2003-08-14

申请号：US10339912

申请日：2003-01-10

Inventor： Joseph P. Burke

IPC: H04B001/10

CPC classification number: H04J13/0048 ,  H04B1/7097 ,  H04B7/0491 ,  H04B7/0845 ,  H04B7/0854 ,  H04B7/0891 ,  H04B2201/70702 ,  H04J13/18 ,  H04L25/03114 ,  H04L2025/03375 ,  H04L2025/03605

Abstract: Techniques for efficient allocation of channelization codes are disclosed. In one aspect, a dedicated data channel is partitioned into a primary channel and a secondary channel. The rate of the primary channel is a relatively low fixed rate. The rate of the secondary channel varies over time in accordance with the rate of the dedicated channel data. In another aspect, a channelization code indicator is transmitted in the primary channel to identify the secondary channel. In yet another aspect, more than one secondary channel may be deployed. Various other aspects are also presented. These aspects have the benefit of efficient code resource allocation, resulting in increased support for users/and or channels, as well as increased system capacity.

Abstract translation: 公开了用于有效分配信道化码的技术。 在一个方面，专用数据信道被划分为主信道和次信道。 主要渠道的比率是相对较低的固定利率。 次级通道的速率根据专用通道数据的速率随时间而变化。 在另一方面，在主信道中发送信道化码指示符以识别次信道。 在另一方面，可以部署多于一个的次级信道。 还提出了各种其他方面。 这些方面有利于高效的代码资源分配，从而增加对用户/或渠道的支持，以及增加的系统容量。