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公开(公告)号：US06594317B2
公开(公告)日：2003-07-15
申请号：US10029038
申请日：2002-04-08
IPC分类号： H04L2700
CPC分类号： H04B1/707 , H04B14/026 , H04L23/02
摘要： A method and apparatus for encoding and decoding signals using code position modulation (CPM) in a communication system. The encoding method includes storing an N-chip pseudo-random noise sequence, such as an m-sequence, in a circular shift register and circularly shifting it to obtain a shifted m-sequence. The shifted m-sequence is compared to an m-bit symbol corresponding to the k bit information value. If the shifted m-sequence and the m-symbol match, the shifted m-sequence is output as the N-chip CPM sequence. Alternatively, the m-symbol is used as an initial condition for a pseudo-noise sequence generator. The corresponding decoder stores an N-chip m-sequence in a circular shift register and a correlates shifted version of the m-sequence with a received N-chip CPM sequence. When a peak in the correlation value is detected, an m-bit field is retrieved from the circular shift register and mapped back to a k-bit information value.
摘要翻译： 一种在通信系统中使用码位置调制（CPM）对信号进行编码和解码的方法和装置。 编码方法包括在圆形移位寄存器中存储诸如m序列的N码片伪随机噪声序列，并循环移位它以获得移位的m序列。 将移位的m序列与对应于k位信息值的m位符号进行比较。 如果移位的m序列和m符号匹配，则移位的m序列作为N码片CPM序列输出。 或者，将m符号用作伪噪声序列发生器的初始条件。 相应的解码器将N-码片m序列存储在循环移位寄存器中，并将m序列的移位版本与接收的N码片CPM序列进行相关。 当检测到相关值中的峰值时，从圆形移位寄存器检索m比特字段并将其映射回到k比特信息值。
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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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3.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：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：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：US20110222454A1
公开(公告)日：2011-09-15
申请号：US13045882
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.
摘要翻译： 方法，系统和设备在可用功率的上下文内提供功率高效的通信。 传输和接收数据速率可根据电源可用的输出功率进行扩展。 数据以至少部分地由可用输出功率确定的数据速率发送。
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公开(公告)号：US07961828B2
公开(公告)日：2011-06-14
申请号：US10959359
申请日：2004-10-06
IPC分类号： H04L7/00
CPC分类号： H04L27/0014 , H04L2027/0026 , H04W24/00 , H04W56/0035
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 by transmitting a set of 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). When system conditions permit, a subset of the set of frequency synchronization bursts may be transmitted instead of transmitting the full set of frequency synchronization bursts.
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。 通过发送一组频率同步脉冲串来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。 当系统条件允许时，可以发送该组频率同步脉冲串的子集，而不是传送全套频率同步脉冲串。
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公开(公告)号：US20090074032A1
公开(公告)日：2009-03-19
申请号：US11857911
申请日：2007-09-19
IPC分类号： H04B1/713
摘要： A technique (300) and apparatus for sharing frequency spectrum amongst cognitive radios is provided. By maintaining an unoccupied spectral quantum between each CR device, the channel technique ensures that a device just beginning transmissions in the CR frequency band will have spectrum from which to start growing. The growth can continue up to the maximum the spectrum can support, when the bandwidth of each device has been reduced to one spectral quantum, and there are no available spectral quanta left.
摘要翻译： 提供了一种在认知无线电中共享频谱的技术（300）和装置。 通过保持每个CR设备之间的空闲光谱量子，信道技术确保刚刚开始在CR频带中传输的设备将具有从其开始生长的频谱。 当每个设备的带宽已经减少到一个光谱量子，并且没有可用的光谱量子剩下时，增长可以持续到频谱可以支持的最大值。
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公开(公告)号：US09564939B2
公开(公告)日：2017-02-07
申请号：US13045915
申请日：2011-03-11
IPC分类号： H04L27/00 , H04B1/3883 , H04W52/02 , G05F1/66
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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