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公开(公告)号：US07016661B2
公开(公告)日：2006-03-21
申请号：US10683098
申请日：2003-10-10
IPC分类号： H04B1/10
CPC分类号： H04B1/406 , H04L2027/0065
摘要： The present invention provides a multimode receiver design for mitigation of frequency offset by selective demodulation of an input modulated signal. The receiver (103) comprises a plurality of demodulators (207). Each of the plurality of demodulators (207) has the same functionality but different receiver sensitivity versus frequency-offset mitigation characteristics. Each of these demodulators incorporates a different demodulation technique. A suitable demodulator is selected to demodulate the received signal. The choice of a suitable demodulator is based on the value of the frequency offset (305, 307).
摘要翻译： 本发明提供一种多模接收机设计，用于通过对输入调制信号的选择性解调来减轻频偏。 接收器（103）包括多个解调器（207）。 多个解调器（207）中的每一个具有相同的功能，但是具有不同的接收机灵敏度与频偏抑制特性。 这些解调器中的每一个都包含不同的解调技术。 选择合适的解调器来解调所接收的信号。 合适的解调器的选择基于频率偏移的值（305,307）。
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公开(公告)号：US07277457B2
公开(公告)日：2007-10-02
申请号：US10678416
申请日：2003-10-03
IPC分类号： H04J3/06
CPC分类号： H04L27/0014 , H04L7/04 , H04L2027/0026 , H04L2027/0083 , H04W56/0035 , Y02D70/00 , Y02D70/142 , Y02D70/144 , Y02D70/162 , Y02D70/22
摘要： A method (500) and system for compensation of frequency offset between a first transceiver (102) and a second transceiver (104) in wireless communication are disclosed. The compensation of the frequency offset between two or more transceivers (102, 104) is achieved using frequency synchronization bursts. These bursts contain information about the frequency offset. The frequency synchronization bursts are transmitted by the first transceiver at a range of frequencies above and below its carrier frequency (502). A second transceiver that receives at least one of these bursts (504) determines the frequency offset (504), and adjusts its frequency to match the frequency of the first transceiver (508). Thereafter, the second transceiver may enter a low power sleep mode (510) in order to reduce its power consumption. The second transceiver returns to active mode (512) just before the start of the transmission of the data packets (514).
摘要翻译： 公开了一种用于在无线通信中补偿第一收发器（102）和第二收发器（104）之间的频率偏移的方法（500）和系统。 使用频率同步脉冲串实现两个或多个收发器（102,104）之间的频率偏移的补偿。 这些突发包含有关频率偏移的信息。 频率同步突发由第一收发器在其载波频率（502）之上和之下的频率范围内传输。 接收这些突发（504）中的至少一个的第二收发器确定频率偏移（504），并且调整其频率以匹配第一收发器（508）的频率。 此后，第二收发器可以进入低功率休眠模式（510），以便降低其功耗。 第二收发器在数据分组（514）的发送开始之前返回到活动模式（512）。
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公开(公告)号：US06519275B2
公开(公告)日：2003-02-11
申请号：US10022942
申请日：2001-12-18
IPC分类号： H04B1707
CPC分类号： H04B1/7075
摘要： A system and method for orthogonal modulation of signals in communication systems. In the transmitter, differentially coded symbols are used to select time-shifted code sequences. The timing, or code position, of a code sequence is determined at the receiver by comparison to the previous code from the same channel, thus eliminating the need for dual-channel transmission and eliminating error due to differences in path propagation time. A fixed preamble code is also used to synchronize the receiver.
摘要翻译： 一种用于通信系统中信号正交调制的系统和方法。 在发射机中，使用差分编码符号来选择时移码序列。 通过与来自相同信道的先前代码进行比较，在接收器处确定码序列的定时或码位置，从而消除了对双信道传输的需要，并消除由于路径传播时间差异引起的误差。 固定的前导码也用于同步接收机。
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4.发明授权Method and system for determining a location using a plurality of selected initial location estimates 有权使用多个选择的初始位置估计来确定位置的方法和系统公开(公告)号：US07092726B2
公开(公告)日：2006-08-15
申请号：US10747377
申请日：2003-12-29
申请人： Qicai Shi , Neiyer S. Correal , Paul E. Gorday , Spyros Kyperountas , Feng Niu
发明人： Qicai Shi , Neiyer S. Correal , Paul E. Gorday , Spyros Kyperountas , Feng Niu
IPC分类号： H04Q7/20
CPC分类号： H04W64/00 , G01S5/02 , G01S5/0289
摘要： A method and system is provided for determining a location for each of a plurality of units, which is selected from one of multiple sets of locations, which are each estimated based upon different initial location estimates. The selected set of locations includes the set which has the minimum error value, where the error value is based on the aggregate of the differences between the range determined from the estimated locations and the measured range. By using different sets of initial location estimates, there is a greater chance that at least one of the sets of initial location estimates will avoid any local minimums and produce a more accurate estimate of unit locations.
摘要翻译： 提供了一种方法和系统，用于确定多个单元中的每一个的位置，所述单元从多个位置集合中的一个组中选择，每个单元基于不同的初始位置估计来估计。 所选择的一组位置包括具有最小误差值的集合，其中误差值基于从估计位置确定的范围与测量范围之间的差异的总和。 通过使用不同的初始位置估计集合，初始位置估计集合中的至少一个将避免任何局部最小值并且对单位位置产生更准确的估计的可能性更大。
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公开(公告)号：US20110250844A1
公开(公告)日：2011-10-13
申请号：US13084865
申请日：2011-04-12
CPC分类号： H04B17/0047 , H04B17/364
摘要： A method, system, and device provide asymmetric round-trip-time (RTT) ranging with multipath correction. A RTT ranging determination using the resulting composite received signal contains multipath error, and compensation or correction of this error in a manner compatible with low-power, low-complexity devices, such as tag devices, is provided.
摘要翻译： 一种方法，系统和设备提供了具有多径校正的不对称往返时间（RTT）范围。 使用所得到的复合接收信号的RTT测距确定包含多径误差，并且以与低功率，低复杂度设备（例如标签设备）兼容的方式来补偿或校正该误差。
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公开(公告)号：US07295638B2
公开(公告)日：2007-11-13
申请号：US10715222
申请日：2003-11-17
CPC分类号： H04L27/22 , H04B1/707 , H04B1/709 , H04B2201/70707
摘要： A direct sequence spread spectrum (DSSS) receiver (100) consistent with certain embodiments has a frequency generator (112) that generates a local oscillator signal without use of a piezoelectric crystal. A frequency converter (108) receives the local oscillator signal and mixes the local oscillator signal with a received DSSS signal to produce a down-converted signal. The received DSSS signal is encoded using a first set of DSSS code. A differential chip detector (116) receives the down-converted signal and converts the down-converted signal to a differentially detected signal. A correlator (120) receives the differentially detected signal and correlates the detected signal with a set of DSSS codes that are time-shifted from the first set of DSSS codes. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.
摘要翻译： 与某些实施例一致的直接序列扩频（DSSS）接收机（100）具有在不使用压电晶体的情况下产生本地振荡器信号的频率发生器（112）。 变频器（108）接收本地振荡器信号，并将本地振荡器信号与接收到的DSSS信号进行混频，产生下变频信号。 接收的DSSS信号使用第一组DSSS码进行编码。 差分芯片检测器（116）接收下变频信号并将下变频信号转换成差分检测信号。 相关器（120）接收差分检测信号，并将检测到的信号与从第一组DSSS码进行时移的一组DSSS码进行相关。 该摘要不被认为是限制性的，因为其他实施例可能偏离本摘要中描述的特征。
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公开(公告)号：US08779901B2
公开(公告)日：2014-07-15
申请号：US13084865
申请日：2011-04-12
CPC分类号： H04B17/0047 , H04B17/364
摘要： A method, system, and device provide asymmetric round-trip-time (RTT) ranging with multipath correction. A RTT ranging determination using the resulting composite received signal contains multipath error, and compensation or correction of this error in a manner compatible with low-power, low-complexity devices, such as tag devices, is provided.
摘要翻译： 一种方法，系统和设备提供了具有多径校正的不对称往返时间（RTT）范围。 使用所得到的复合接收信号的RTT测距确定包含多径误差，并且以与低功率，低复杂度设备（例如标签设备）兼容的方式来补偿或校正该误差。
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公开(公告)号：US20110222419A1
公开(公告)日：2011-09-15
申请号：US13045950
申请日：2011-03-11
CPC分类号： H04W52/0261 , G05F1/66 , H04B1/3883 , H04L27/2614 , H04L47/748 , H04W28/14 , Y02D70/00 , Y02D70/144
摘要： A method, system, and device provide power-efficient communications within the context of available power. Transmission and receipt data rates are scalable in accordance with output power available from a power source. Data is transmitted at a data rate determined, at least in part, by the available output power.
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公开(公告)号：US07706465B2
公开(公告)日：2010-04-27
申请号：US11566893
申请日：2006-12-05
IPC分类号： H04L27/00
CPC分类号： H04B1/707 , H04L5/0007 , H04L5/0037 , H04L5/0058
摘要： During operation of a node in a secondary communication system (100) data enters a spreader (301) and is appropriately spread. The spread data is then modulated onto all available channels using a multi-carrier OFDM modulation technique. This entails the spread data being modulated onto those channels that are currently being used by the primary communication system (120). Finally, a transmitter (303) transmits the spread data only over carriers that will not interfere with the primary communication system.
摘要翻译： 在二次通信系统（100）中的节点的操作期间，数据进入扩展器（301）并适当地扩展。 然后使用多载波OFDM调制技术将扩展数据调制到所有可用信道上。 这导致扩展数据被调制到当前正在被主要通信系统（120）使用的那些信道上。 最后，发射机（303）仅在不会干扰主要通信系统的载波上发送扩展数据。
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公开(公告)号：US07593718B2
公开(公告)日：2009-09-22
申请号：US10334383
申请日：2002-12-31
IPC分类号： H04L12/58
CPC分类号： H04W4/12 , H04W84/005 , H04W84/12
摘要： A WLAN communication system (10) and method employs mobile WLAN base stations (16) that include WLAN transceivers (26) and memory (30) for storing received messages from one or more mobile WLAN devices (12a-12n). The mobile WLAN base stations (16) serve as moving message carriers or message repeaters of messages for the mobile WLAN devices. In one embodiment, a mobile WLAN base station (16) receives messages transmitted by several mobile WLAN devices (12a-12n), temporarily stores the received messages, and delivers the stored messages to a fixed WLAN base station or another mobile WLAN base station when the mobile WLAN base station (16) moves to within communication range of the applicable fixed or other mobile WLAN base station.
摘要翻译： WLAN通信系统（10）和方法采用移动WLAN基站（16），其包括用于存储来自一个或多个移动WLAN设备（12a-12n）的接收到的消息的WLAN收发器（26）和存储器（30）。 移动WLAN基站（16）用作用于移动WLAN设备的消息的移动消息载体或消息中继器。 在一个实施例中，移动WLAN基站（16）接收由若干移动WLAN设备（12a-12n）发送的消息，临时存储所接收的消息，并且将存储的消息传送到固定的WLAN基站或另一个移动WLAN基站， 移动WLAN基站（16）移动到可应用的固定或其他移动WLAN基站的通信范围内。
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