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1. 发明授权

US06748011B2 Efficient multicarrier filter 失效
标题翻译：高效多载波滤波器
公开(公告)号：US06748011B2
公开(公告)日：2004-06-08
申请号：US09756843
申请日：2001-01-09
申请人： Thunyachate Ekvetchavit , Maruthy Vedam , Inyup Kang
发明人： Thunyachate Ekvetchavit , Maruthy Vedam , Inyup Kang
IPC分类号： H04B1707
CPC分类号： H04L27/2601 , H04L5/026 , H04L5/06 , H04L25/03159 , H04L25/03343 , H04L2025/03414
摘要： A multi-carrier filter for a wireless communications system employing a multi-carrier signal. The multi-carrier filter includes a first mechanism for receiving the multi-carrier signal and extracting carrier signal components of the multi-carrier signal in response thereto. A second mechanism filters the carrier signal components and outputs a demodulated and filtered multi-bandwidth signal in response thereto. In the specific embodiment, the first mechanism includes a rotator. The multi-carrier signal is a 3× bandwidth multi-carrier signal having three carrier components. The three carrier components include a center carrier, a left carrier, and a right carrier. The center carrier, the left carrier, and the right carrier are separated by approximately 1.25 MHz. The rotator is a lookup table rotator that includes a mechanism for selectively rotating the multi-carrier-signal clockwise or counter clockwise and outputting the left carrier or the right carrier, respectively, in response thereto.
摘要翻译：一种用于采用多载波信号的无线通信系统的多载波滤波器。多载波滤波器包括用于接收多载波信号并且响应于此提取多载波信号的载波信号分量的第一机制。第二机制对载波信号分量进行滤波并响应于此输出解调和滤波的多带宽信号。在具体实施例中，第一机构包括转子。多载波信号是具有三个载波分量的3×带宽多载波信号。三个载体部件包括中心载体，左载体和右载体。中心载波，左载波和右载波分离约1.25 MHz。旋转器是一种查阅表旋转器，其包括用于分别顺序地或逆时针地选择性地旋转多载波信号的机构，并响应于此分别输出左载波或右载波。

2. 发明授权

US07684373B2 Coverage determination and switching between overlay communication systems 有权
标题翻译：重叠通信系统之间的覆盖确定和切换
公开(公告)号：US07684373B2
公开(公告)日：2010-03-23
申请号：US10933726
申请日：2004-09-02
申请人： Thunyachate Ekvetchavit , Ravi Govindarajula
发明人： Thunyachate Ekvetchavit , Ravi Govindarajula
IPC分类号： H04B7/216
CPC分类号： H04W36/14 , H04W36/30 , H04W88/06
摘要： For coverage determination and system switching, a terminal obtains pilot strength estimates for base stations in first and second wireless communication systems (e.g., packet data system and voice/data system) and received signal quality estimates for at least one serving base station in the first system. The terminal derives various metrics based on the received signal quality estimates and pilot strength estimates. The terminal may perform handoff to the second system if weak coverage is detected for the first system, a received signal quality metric (Q) for the first system is below a Qth—dn threshold, and a pilot strength metric (V) for the second system exceeds a Vth—dn threshold. The terminal may perform handoff to the first system if good coverage is detected for this system, metric Q exceeds a Qth—up threshold, or a maximum pilot strength metric (M) for the first system exceeds a Mth—up threshold.
摘要翻译：对于覆盖确定和系统切换，终端获得第一和第二无线通信系统（例如，分组数据系统和语音/数据系统）中的基站的导频强度估计，以及在第一和第二无线通信系统中的至少一个服务基站的接收信号质量估计系统。终端根据接收到的信号质量估计和导频强度估计，得出各种度量。如果针对第一系统检测到弱覆盖，则终端可以执行切换到第二系统，第一系统的接收信号质量度量（Q）低于第Q-Dn阈值，并且第二系统的导频强度度量（V）系统超过Vth-dn阈值。如果对于该系统检测到良好的覆盖，则终端可以执行切换到第一系统，度量Q超过Qth-up阈值，或者第一系统的最大导频强度度量（M）超过Mth-up阈值。

3. 发明授权

US07623861B2 Method and apparatus to optimize off-frequency pilot searching by wireless mobile station 失效
标题翻译：优化无线移动台离频导频搜索的方法和装置
公开(公告)号：US07623861B2
公开(公告)日：2009-11-24
申请号：US10313750
申请日：2002-12-05
申请人： Abhay Arvind Joshi , Arthur James Neufeld , Steven Yoon , Thunyachate Ekvetchavit
发明人： Abhay Arvind Joshi , Arthur James Neufeld , Steven Yoon , Thunyachate Ekvetchavit
IPC分类号： H04W36/00 , H04W72/00
CPC分类号： H04W48/20 , H04W52/0225 , H04W52/0245 , Y02D70/00
摘要： A wireless mobile telephone (400) is operated so as manage the performance of “off-frequency searches,” that is, searches for base station pilot signals that differ in frequency from the pilot signals in the mobile station's active set. Whenever frequency searching is performed (such as responsive to emerging from a reduced-power sleep mode), the mobile station performs on-frequency pilot signal searching (902) upon a prescribed active set frequency. Only if a prescribed off-frequency searching condition (903-908) is satisfied, the mobile station additionally performs off-frequency pilot signal searching (912) upon one or more neighboring base stations' frequencies.
摘要翻译：操作无线移动电话（400）以便管理“偏离频率搜索”的性能，即，搜索与移动台的活动集中的导频信号不同的基站导频信号。无论何时执行频率搜索（例如响应于从低功耗睡眠模式出来），移动台根据规定的活动设定频率执行频率导频信号搜索（902）。只有满足规定的偏频搜索条件（903-908）时，移动台在一个或多个相邻基站的频率上附加地执行非频率导频信号搜索（912）。

4. 发明授权

US07623566B2 Method and apparatus for demodulating signals processed in a transmit diversity mode 有权
标题翻译：用于解调以发射分集模式处理的信号的方法和装置
公开(公告)号：US07623566B2
公开(公告)日：2009-11-24
申请号：US11624194
申请日：2007-01-17
申请人： Douglas Neal Rowitch , Way-Shing Lee , Thunyachate Ekvetchavit
发明人： Douglas Neal Rowitch , Way-Shing Lee , Thunyachate Ekvetchavit
IPC分类号： H04B1/69 , H04B1/707 , H04B1/713
CPC分类号： H04B1/70751 , H04B1/70752 , H04B1/708 , H04B1/709 , H04B7/0613 , H04J13/004
摘要： Demodulator architectures for processing a received signal in a wireless communications system. The demodulator includes a number of correlators coupled to a combiner. Each correlator typically receives and despreads input samples (which are generated from the received signal) with a respective despreading sequence to provide despread samples. Each correlator then decovers the despread samples to provide decovered “half-symbols” and further demodulates the decovered half-symbols with pilot estimates to generate correlated symbols. The decovering is performed with a Walsh symbol having a length (T) that is half the length (2T) of a Walsh symbol used to cover the data symbols in the transmitted signal. The combiner selectively combines correlated symbols from the assigned correlators to provide demodulated symbols. One or more correlators can be assigned to process one or more instances of each transmitted signal. The pilot estimates used within each assigned correlator to demodulate the decovered half-symbols are generated based on the signal instance being processed by that correlator.
摘要翻译：用于在无线通信系统中处理接收信号的解调器架构。解调器包括耦合到组合器的多个相关器。每个相关器通常以相应的解扩序列接收和解扩输入采样（其从接收信号产生），以提供解扩样本。每个相关器然后解码解扩样本以提供去除的“半符号”，并且用导频估计进一步解调已解除的半符号以产生相关符号。使用具有用于覆盖发送信号中的数据符号的沃尔什符号的长度（2T）的一半的长度（T）的沃尔什符号执行解复用。组合器选择性地组合来自所分配的相关器的相关符号以提供解调符号。可以分配一个或多个相关器来处理每个发射信号的一个或多个实例。在每个分配的相关器内使用的导频估计是根据该相关器正在处理的信号实例产生的。

5. 发明申请

US20090163209A1 Method and Apparatus for Determining Coverage and Switching Between Overlay Communication Systems 审中-公开
标题翻译：确定叠加通信系统覆盖和切换的方法和装置
公开(公告)号：US20090163209A1
公开(公告)日：2009-06-25
申请号：US12249726
申请日：2008-10-10
申请人： Peter J. Black , Ramin Rezaiifar , Thunyachate Ekvetchavit
发明人： Peter J. Black , Ramin Rezaiifar , Thunyachate Ekvetchavit
IPC分类号： H04W36/00
CPC分类号： H04W36/30 , H04W36/14
摘要： Techniques to determine whether or not a terminal is under the coverage of a current wireless communication system (e.g., a packet data system) and to switch from the current system to another wireless communication system (e.g., a voice/data system). In one method, at least one measurement of at least one parameter for at least one base station in the current system is initially obtained. The measurement(s) may be SNR measurements. A metric is derived based on the measurement(s) and used (typically along with a metric threshold and a timer) to determine whether or not the terminal is within the coverage of the current system. A switch to another system is initiated if the terminal is deemed to be outside the coverage of the current system. The two systems provide at least one common service (e.g., packet data service).
摘要翻译：确定终端是否处于当前无线通信系统（例如，分组数据系统）的覆盖范围内并且从当前系统切换到另一个无线通信系统（例如，语音/数据系统）的技术。在一种方法中，首先获得当前系统中至少一个基站的至少一个参数的至少一个测量。测量可以是SNR测量。基于测量并使用（通常与度量阈值和定时器）来导出度量，以确定终端是否在当前系统的覆盖范围内。如果终端被认为在当前系统的覆盖范围之外，则启动到另一个系统的切换。两个系统提供至少一个公共服务（例如，分组数据服务）。

6. 发明授权

US07366137B2 Signal-to-noise estimation in wireless communication devices with receive diversity 失效
标题翻译：具有接收分集的无线通信设备中的信噪比估计
公开(公告)号：US07366137B2
公开(公告)日：2008-04-29
申请号：US10448815
申请日：2003-05-31
申请人： Farrokh Abrishamkar , Brian Banister , Gilbert C. Sih , Thunyachate Ekvetchavit
发明人： Farrokh Abrishamkar , Brian Banister , Gilbert C. Sih , Thunyachate Ekvetchavit
IPC分类号： H04Q7/00
CPC分类号： H04B1/1027 , H04B17/336 , H04W52/143 , H04W52/241 , H04W52/248
摘要： This disclosure is directed to techniques for estimating signal-to-noise ratio (SNR) of signals received by a wireless communication device. The techniques take advantage of spatial receive diversity in a wireless communication device to achieve accurate estimates of SNR. In general, a spatial projection wiener filter function can be applied to incoming symbol estimates to support efficient computation of SNR. The estimated SNR can be used to produce power control commands for use in forward power control.
摘要翻译：本公开涉及用于估计由无线通信设备接收的信号的信噪比（SNR）的技术。这些技术利用无线通信设备中的空间接收分集来实现SNR的准确估计。通常，空间投影维纳滤波函数可以应用于输入符号估计，以支持SNR的有效计算。估计的SNR可用于产生用于正向功率控制的功率控制命令。

7. 发明申请

US20070116101A1 METHOD AND APPARATUS FOR DEMODULATING SIGNALS PROCESSED IN A TRANSMIT DIVERSITY MODE 有权
标题翻译：用于在发射多样性模式下处理信号的方法和装置
公开(公告)号：US20070116101A1
公开(公告)日：2007-05-24
申请号：US11624194
申请日：2007-01-17
申请人： Douglas Rowitch , Way-Shing Lee , Thunyachate Ekvetchavit
发明人： Douglas Rowitch , Way-Shing Lee , Thunyachate Ekvetchavit
IPC分类号： H04B1/00
CPC分类号： H04B1/70751 , H04B1/70752 , H04B1/708 , H04B1/709 , H04B7/0613 , H04J13/004
摘要： Demodulator architectures for processing a received signal in a wireless communications system. The demodulator includes a number of correlators coupled to a combiner. Each correlator typically receives and despreads input samples (which are generated from the received signal) with a respective despreading sequence to provide despread samples. Each correlator then decovers the despread samples to provide decovered “half-symbols” and further demodulates the decovered half-symbols with pilot estimates to generate correlated symbols. The decovering is performed with a Walsh symbol having a length (T) that is half the length (2T) of a Walsh symbol used to cover the data symbols in the transmitted signal. The combiner selectively combines correlated symbols from the assigned correlators to provide demodulated symbols. One or more correlators can be assigned to process one or more instances of each transmitted signal. The pilot estimates used within each assigned correlator to demodulate the decovered half-symbols are generated based on the signal instance being processed by that correlator.
摘要翻译：用于在无线通信系统中处理接收信号的解调器架构。解调器包括耦合到组合器的多个相关器。每个相关器通常以相应的解扩序列接收和解扩输入采样（其从接收信号产生），以提供解扩样本。每个相关器然后解码解扩样本以提供去除的“半符号”，并且用导频估计进一步解调已解除的半符号以产生相关符号。使用具有用于覆盖发送信号中的数据符号的沃尔什符号的长度（2T）的一半的长度（T）的沃尔什符号执行解复用。组合器选择性地组合来自所分配的相关器的相关符号以提供解调符号。可以分配一个或多个相关器来处理每个发射信号的一个或多个实例。在每个分配的相关器内使用的导频估计是根据该相关器正在处理的信号实例产生的。

8. 发明授权

US06771692B2 Time tracking in a non-negligible multipath spacing environment 有权
公开(公告)号：US06771692B2
公开(公告)日：2004-08-03
申请号：US09964589
申请日：2001-09-25
申请人： Roland Reinhard Rick , Parvathanathan Subrahmanya , Brian K. Butler , Shimman Patel , Thunyachate Ekvetchavit
发明人： Roland Reinhard Rick , Parvathanathan Subrahmanya , Brian K. Butler , Shimman Patel , Thunyachate Ekvetchavit
IPC分类号： H04B1707
CPC分类号： H04B1/7085 , H04B1/7115 , H04B7/0667 , H04B7/0697 , H04B2201/70701
摘要： In an antenna diversity environment, the timing offset of the receiver's fingers are based on the timing offset of the received peaks of the base station transmit signals. In a system with non-negligible multipath spacing, the timing offset of the received peaks of the base station transmit signals are not necessarily at the same location. In one embodiment, the demodulating elements for the signal from each base station antenna use the same offset for demodulating and determining an error signal based on pilot signal sampling prior to the timing offset and subsequent to the timing offset. The error signals are averaged and used by a time tracking loop to track the incoming signal. In another embodiment, the demodulating elements for the signal from each base station antenna independently time track the signals with different timing offsets for each finger. The preferred embodiment depends on the method used by the base station to multiplex the data onto multiple transmit antennas.

9. 发明授权

US07684474B2 Method and apparatus for demodulating signals processed in a transmit diversity mode 有权
标题翻译：用于解调以发射分集模式处理的信号的方法和装置
公开(公告)号：US07684474B2
公开(公告)日：2010-03-23
申请号：US11624198
申请日：2007-01-17
申请人： Douglas Neal Rowitch , Way-Shing Lee , Thunyachate Ekvetchavit
发明人： Douglas Neal Rowitch , Way-Shing Lee , Thunyachate Ekvetchavit
IPC分类号： H04B1/69 , H04B1/707 , H04B1/713
CPC分类号： H04B1/70751 , H04B1/70752 , H04B1/708 , H04B1/709 , H04B7/0613 , H04J13/004
摘要： Demodulator architectures for processing a received signal in a wireless communications system. The demodulator includes a number of correlators coupled to a combiner. Each correlator typically receives and despreads input samples (which are generated from the received signal) with a respective despreading sequence to provide despread samples. Each correlator then decovers the despread samples to provide decovered “half-symbols” and further demodulates the decovered half-symbols with pilot estimates to generate correlated symbols. The decovering is performed with a Walsh symbol having a length (T) that is half the length (2T) of a Walsh symbol used to cover the data symbols in the transmitted signal. The combiner selectively combines correlated symbols from the assigned correlators to provide demodulated symbols. One or more correlators can be assigned to process one or more instances of each transmitted signal. The pilot estimates used within each assigned correlator to demodulate the decovered half-symbols are generated based on the signal instance being processed by that correlator.
摘要翻译：用于在无线通信系统中处理接收信号的解调器架构。解调器包括耦合到组合器的多个相关器。每个相关器通常以相应的解扩序列接收和解扩输入采样（其从接收信号产生），以提供解扩样本。每个相关器然后解码解扩样本以提供去除的“半符号”，并且用导频估计进一步解调已解除的半符号以产生相关符号。使用具有用于覆盖发送信号中的数据符号的沃尔什符号的长度（2T）的一半的长度（T）的沃尔什符号执行解复用。组合器选择性地组合来自所分配的相关器的相关符号以提供解调符号。可以分配一个或多个相关器来处理每个发射信号的一个或多个实例。在每个分配的相关器内使用的导频估计是根据该相关器正在处理的信号实例产生的。

10. 发明授权

US07493131B2 Velocity responsive power control 有权
标题翻译：速度响应功率控制
公开(公告)号：US07493131B2
公开(公告)日：2009-02-17
申请号：US10097039
申请日：2002-03-12
申请人： Gilbert Christopher Sih , Shimman Patel , Thunyachate Ekvetchavit
发明人： Gilbert Christopher Sih , Shimman Patel , Thunyachate Ekvetchavit
IPC分类号： H04B7/00 , H04Q7/20
CPC分类号： H04W52/282 , H04W52/60
摘要： The velocity of a wireless communications device (WCD) (106) is estimated. In response to this estimate a power control command rate is determined. The WCD 106 transmits power control signals to a base station (102) according to the power control command rate. The power control command rate may be determined by mapping the estimated velocity to a velocity range, and selecting a rate that corresponds to the velocity range as the power control command rate. Velocity is estimated by measuring a level crossing rate of a multipath signal.
摘要翻译：估计无线通信设备（WCD）（106）的速度。响应于该估计，确定功率控制命令速率。 WCD 106根据功率控制命令速率向基站（102）发送功率控制信号。功率控制命令速率可以通过将估计的速度映射到速度范围，并且选择与速度范围对应的速率作为功率控制命令速率来确定。通过测量多路径信号的电平穿越率来估计速度。

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