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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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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：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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7.发明授权Method and apparatus for determining the location of a unit using neighbor lists 有权用于使用邻居列表确定单元的位置的方法和装置公开(公告)号：US07242947B2
公开(公告)日：2007-07-10
申请号：US10743961
申请日：2003-12-23
申请人： Feng Niu , Spyros Kyperountas , Frederick L. Martin , Jian Huang , Qicai Shi , Timothy Bancroft , Neiyer S. Correal
发明人： Feng Niu , Spyros Kyperountas , Frederick L. Martin , Jian Huang , Qicai Shi , Timothy Bancroft , Neiyer S. Correal
IPC分类号： H04Q7/20
CPC分类号： G01S5/14 , G01S5/02 , G01S5/0289 , G06Q10/087 , H04W8/18 , H04W64/00
摘要： A method and location determination module is provided for determining a location of one of a plurality of units using neighbor lists. Each unit is communicatively coupled to at least some of the other plurality of units, where at least some of the plurality of units are reference units, whose locations are known. The units communicate with other nearby units within communication range, to establish neighbor lists. A unit to be located then identifies an aggregate value corresponding to the number of occurrences of the reference units in the neighbor list of the unit to be located and the neighbor lists of each of a group of associated units. The location of the unit to be located is then determined, based upon the known locations of the reference units and the number of identified occurrences of the reference units in the corresponding neighbor lists.
摘要翻译： 提供了一种方法和位置确定模块，用于使用邻居列表来确定多个单元中的一个单元的位置。 每个单元通信地耦合到其他多个单元中的至少一些，其中多个单元中的至少一些是参考单元，其位置是已知的。 单位与通信范围内的其他附近单位进行通信，建立邻居列表。 然后，要定位的单元识别与要定位的单元的邻居列表中的参考单元的出现次数和一组关联单元中的每一个的邻居列表相对应的聚合值。 然后，基于参考单元的已知位置和相应邻居列表中的参考单元的识别出现次数来确定要定位的单元的位置。
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公开(公告)号：US06922432B2
公开(公告)日：2005-07-26
申请号：US09803258
申请日：2001-03-09
CPC分类号： H04B1/707
摘要： A signaling system is provided in which a spread spectrum code is cyclically shifted by a cyclical shift dictated by a bit pattern of one or more bits. The cyclically shifted spread spectrum code is used to modulate a carrier frequency, and transmitted from a transmitter to a receiver. At the receiver the signal including the cyclically shifted spectrum code is demodulated to recover the cyclically shifted code. The cyclical shift is then determined and the bit pattern which is associated with the cyclical shift is output. The method can be used in direct sequence spread spectrum communication.
摘要翻译： 提供了一种信号系统，其中扩频码被循环移位由一个或多个位的位模式指示的循环移位。 循环移位扩频码用于调制载波频率，并从发射机发射到接收机。 在接收机处，解调包括循环移位的频谱码的信号以恢复循环移位码。 然后确定循环移位，并输出与循环移位相关联的位模式。 该方法可用于直接序列扩频通信。
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公开(公告)号：US07050467B1
公开(公告)日：2006-05-23
申请号：US09633705
申请日：2000-08-07
申请人： Frederick L. Martin
发明人： Frederick L. Martin
CPC分类号： H03K7/04 , H03K5/133 , H03K5/135 , H03K2005/00156 , H03K2005/00286 , H03L7/0812
摘要： A digital-to-phase or digital-to-time-shift converter (100) includes a delay line (106), a multiplexor (108) and synchronization circuit (110). In the converter (100) the clock edges of a reference signal are shifted in response to the value of a multi-bit digital word, IN (104). The synchronization circuit (110) gates the output of the multiplexor (108) such that a pulse appears at the synchronization circuit's (110) output port (114) only when the circuit is gated by a signal at input TRIG (112). The synchronization circuit (110) creates a time aperture for the multiplexor output.
摘要翻译： 数字 - 相位或数 - 时 - 转换器（100）包括延迟线（106），多路复用器（108）和同步电路（110）。 在转换器（100）中，参考信号的时钟边沿响应多位数字字IN（104）的值移位。 同步电路（110）仅在多路复用器（108）的输出端口门控时，使得只有当电路被输入TRIG（112）的信号选通时，脉冲出现在同步电路（110）的输出端口（114）。 同步电路（110）创建多路复用器输出的时间孔。
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公开(公告)号：US06891420B2
公开(公告)日：2005-05-10
申请号：US10036558
申请日：2001-12-21
CPC分类号： H03L7/22 , H03L7/0812 , H03L7/16
摘要： A digital frequency synthesizer includes one or more reference clocks (104, 1316, 1502A, 1504A, 1506A) optionally coupled through one or more pulse width reducers (106) to one or more main delay lines (108, 702, 1502B, 1504B, 1506B) that include a plurality of output taps (108B-108I, 702B-702E). During at least certain periods of the reference clock (104) a plurality of the output taps are coupled to a common output (130, 1312, 1508), thereby producing an output signal that has a frequency that exceeds a frequency of the one or more reference clocks. The coupling is preferably accomplished by transmission gates (114, 128, 720-724, 1420-1434) that are switched by gating pulses that are received from decoders (148, 150, 1418) via gating signal delay lines (134-146, 704-718, 1404-1416).
摘要翻译： 数字频率合成器包括一个或多个参考时钟（104,1316,1502A，1504A，1506A），其可选地通过一个或多个脉冲宽度减法器（106）耦合到一个或多个主延迟线（108,702,1502B ，1504B，1506B），其包括多个输出抽头（108B-108I，702B-702E）。 在参考时钟（104）的至少某些时段期间，多个输出抽头耦合到公共输出（130,1312,1508），从而产生具有超过一个或多个频率的频率的频率的输出信号 参考时钟。 耦合优选地由通过选通脉冲切换的传输门（114,128,720-724,1420-1434）完成，门脉冲经由选通信号延迟线（134-146,704）从解码器（148,150,1418）接收 -718,1404-1416）。
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