公开(公告)号：US07292624B2

公开(公告)日：2007-11-06

申请号：US10227836

申请日：2002-08-27

申请人： Michael A. Mayor ,  Lester G. Matheson ,  Robert D. Martin ,  John H. Gass ,  Mhairi N. McCune

发明人： Michael A. Mayor ,  Lester G. Matheson ,  Robert D. Martin ,  John H. Gass ,  Mhairi N. McCune

IPC分类号： H04B1/00

CPC分类号： H04B1/7093 ,  H04B1/708

摘要： A Direct Sequence Spread Spectrum receiver is described in which a complex spread spectrum signal is cross correlated by four digitally matched filters. The filters and subsequent multipliers correlate the in-phase and quadrature components as well as the current and previous symbols. The result is a more robust signal acquisition at very low signal to noise ratios.

摘要翻译： 描述了一种直接序列扩频接收机，其中复扩展频谱信号由四个数字匹配滤波器互相关。 滤波器和后续乘法器将同相和正交分量以及当前和先前符号相关。 结果是在非常低的信噪比下更稳健的信号采集。

公开(公告)号：US07218682B2

公开(公告)日：2007-05-15

申请号：US10073037

申请日：2002-02-12

申请人： Michael A. Mayor ,  Ning Lu

发明人： Michael A. Mayor ,  Ning Lu

IPC分类号： H04L27/04

CPC分类号： H04B1/7115 ,  H04B1/7117 ,  H04B7/022 ,  H04B7/026

摘要： Enhanced reception of transmitted signals in a communication system is achieved by synchronously combining transmissions from a cluster of transmitters at a distant receiver. The transmitters coordinate transmissions such that each substantially simultaneously transmits the same signal on the same communication channel. As a consequence of the spatial diversity of the transmitters, the transmitted signals arrive at the receiver at different times. The receiver essentially treats the different transmitted signals as though they were different multipath signals from a single transmitter. A multipath equalizer or combiner is used to determine timing offsets among the received signals, and the received signals are time aligned by phase rotating the signals in accordance with the estimated timing offsets. The time-aligned signals are then coherently combined and detected. The combined signal has a greater signal-to-noise ratio than the individual received signals, permitting detection at a greater range or with a lower bit error rate.

摘要翻译： 在通信系统中对发射信号的增强的接收是通过在远端的接收机上同步组合发射机的发射来实现的。 发射机协调发射，使得每个发射机在相同的通信信道上基本上同时发射相同的信号。 作为发射机的空间分集的结果，传输的信号在不同的时间到达接收机。 接收机基本上将不同的发射信号视为与单个发射机不同的多路径信号。 使用多径均衡器或组合器来确定接收信号之间的定时偏移，并且接收的信号通过根据估计的定时偏移相位旋转信号而被时间对准。 然后将时间对齐的信号相干组合和检测。 组合信号具有比各个接收信号更大的信噪比，允许在较大范围或较低误码率下进行检测。

公开(公告)号：US5943322A

公开(公告)日：1999-08-24

申请号：US644658

申请日：1996-04-24

申请人： Michael A. Mayor ,  Paul A. Gilmour

发明人： Michael A. Mayor ,  Paul A. Gilmour

IPC分类号： H04B7/26 ,  H04J13/10 ,  H04J13/02

CPC分类号： H04J13/102 ,  H04B7/2628 ,  H04W56/00 ,  H04W74/04

摘要： Personal communications in a code division multiple access system operated without a base is provided with simultaneous transmission of a communications channel and a control channel, each spread by different PN codes. The PN code facilitates restricting communications on the network to a particular conversation mode and between identified radios. Transmissions are performed in a time division duplex manner in 62.5 milliseconds slots. One of the radios initiates transmission and maintains power control and time synchronization normally done by a base station. A network control station can voluntarily or by command transfer control of the network to any of the other radios on the network. Colliding transmissions from more than one radio require the radios to retry transmitting until one of the radios transmits in an earlier time slot. Conversational mode capability is provided by equipping the radio receivers with despreaders in parallel for permitting a receiving radio to separately despread the simultaneously transmitted signals all other radios on the network and responding to each radio transmission individually. Simultaneous voice and data communications can be accomplished by equipping the receivers with despreaders for discriminating voice and data information signals spread by different PN codes.

摘要翻译： 在没有基地的情况下操作的码分多址系统中的个人通信被提供有通信信道和控制信道的同时传输，每个通信信道和控制信道由不同的PN码扩展。 PN码有助于将网络上的通信限制到特定对话模式和识别的无线电之间。 在62.5毫秒的时隙中以时分双工方式执行传输。 无线电之一发起传输并保持通常由基站完成的功率控制和时间同步。 网络控制站可以自主地或通过网络的命令传输控制到网络上的任何其他无线电。 来自多于一个无线电的碰撞传输需要无线电机重试发射，直到其中一个无线电装置在较早的时隙内发射。 通过对无线电接收机并行配置解扩器来提供会话模式能力，以允许接收无线电单独地解除同时发送的信号，网络上的所有其他无线电并单独响应每个无线电传输。 可以通过为接收机配备解扩器来识别通过不同PN码扩展的语音和数据信息信号来实现同时语音和数据通信。

公开(公告)号：US06859463B1

公开(公告)日：2005-02-22

申请号：US09708189

申请日：2000-11-08

申请人： Michael A. Mayor ,  Donald J. Rasmussen ,  Eric A. Whitehill ,  Charles A. Simmons ,  Dennis McCrady

发明人： Michael A. Mayor ,  Donald J. Rasmussen ,  Eric A. Whitehill ,  Charles A. Simmons ,  Dennis McCrady

IPC分类号： H04B7/005 ,  H04L1/00 ,  H04L12/28 ,  H04L12/413 ,  H04L12/56

CPC分类号： H04W52/241 ,  H04L1/0002 ,  H04L1/0007 ,  H04L1/0009 ,  H04L1/0015 ,  H04W24/00 ,  H04W28/18

摘要： Operational parameters for transmitting a signal over a communication channel of a network are selected by first determining RF conditions on the communication channel from a received signal transmitted over the communication channel. An initial set of parameter values is selected for transmitting the signal based on RF conditions determined from the received signal. The initial set of parameter values is used to identify other sets of parameter values as other potential candidates for transmitting the signal. The parameter values in the other sets of parameter values differ from parameter values in the initial set of parameter values by less than a predetermined amount. The expected performance of the candidate sets of parameter values is compared to determine which set of parameter values has the best expected performance among the candidate sets of parameter values. The signal is transmitted on the communication channel using the selected set of parameter values.

摘要翻译： 通过首先根据通过通信信道发送的接收信号确定通信信道上的RF条件来选择通过网络的通信信道发送信号的操作参数。 基于从接收到的信号确定的RF条件，选择初始的参数值集合来发送信号。 初始参数值集用于将其他参数值集合识别为用于发送信号的其他潜在候选。 其他参数值组中的参数值与初始参数值组中的参数值不同，预先设定的量不大。 比较候选参数值集合的期望性能，以确定参数值的哪组参数值在候选参数值集合中具有最佳预期性能。 使用所选择的参数值集合在通信信道上发送信号。

公开(公告)号：US06700388B1

公开(公告)日：2004-03-02

申请号：US10076568

申请日：2002-02-19

申请人： Michael A. Mayor ,  David W. Lagrow

发明人： Michael A. Mayor ,  David W. Lagrow

IPC分类号： H01H3102

CPC分类号： G01R29/0892 ,  G01R29/0814 ,  G01R31/001

摘要： An EMI testing scheme involves analyzing an analog input signal in frequency band segments. The input signal is passband filtered and digitally sampled before being converted to a complex analytic signal via a Hilbert transform filter and then transformed into a frequency domain signal via a Discrete Fourier Transform (DFT). Pre-stored frequency window filters are then applied to the frequency domain signal. The set of discrete filter sample points which form the window filters are designed such that particular frequency sub-bands of a desired bandwidth within the frequency segment are selected for EMI analysis. By applying different frequency window filters to the frequency domain signal, different frequency sub-bands are sequentially selected for analysis. An inverse DFT transforms the filtered signal back to the time domain, and the peak voltage of the time domain signal is compared with a threshold to determine whether EMI levels within the selected sub-band are acceptable.

摘要翻译： EMI测试方案包括分析频段段中的模拟输入信号。 输入信号经过带通滤波和数字采样，然后通过希尔伯特变换滤波器转换为复杂分析信号，然后通过离散傅立叶变换（DFT）转换为频域信号。 然后将预先存储的频率窗口滤波器应用于频域信号。 形成窗口滤波器的一组离散滤波器采样点被设计成使得频率段内的期望带宽的特定频率子带被选择用于EMI分析。 通过对频域信号应用不同的频率窗口滤波器，顺序选择不同的频率子带进行分析。 逆DFT将经滤波的信号转换回时域，并将时域信号的峰值电压与阈值进行比较，以确定所选子带内的EMI电平是否可接受。

公开(公告)号：US07050775B2

公开(公告)日：2006-05-23

申请号：US10192559

申请日：2002-07-11

申请人： Michael A. Mayor ,  Ning Lu

发明人： Michael A. Mayor ,  Ning Lu

IPC分类号： H04B7/00

CPC分类号： H04B1/7156 ,  H04B2001/71566 ,  H04W52/0229 ,  Y02D70/40

摘要： A radio communication unit employs passive devices and a loop filter to receive a coded frequency modulated wakeup or synchronization signal that enables the receiving radio unit and initiates communications. The loop filter simultaneously tracks phase and frequency and provides smoothing to enable synchronization with weak signals (e.g., signals that typically do not enable a standard phase locked loop (PLL) to lock). In particular, when the communication unit is in a standby mode, the passive circuits of the present invention are receiving energy from a unit antenna and initially function as a phase locked loop (PLL) to lock onto an incoming signal. The wakeup or synchronization signal includes a series of tones at different frequencies, where the specific sequence is prearranged between the transmitting and receiving units. When each tone in the sequence has been detected by the receiving unit, the unit is enabled for communications.

摘要翻译： 无线电通信单元采用无源设备和环路滤波器来接收编码调频的唤醒或同步信号，使得接收无线电单元能够启动通信。 环路滤波器同时跟踪相位和频率，并提供平滑以实现与弱信号的同步（例如，通常不使标准锁相环（PLL）锁定的信号）。 特别地，当通信单元处于待机模式时，本发明的无源电路从单元天线接收能量，并且最初用作锁相环（PLL）以锁定到输入信号。 唤醒或同步信号包括不同频率的一系列音调，其中特定序列在发射和接收单元之间预先布置。 当接收单元检测到序列中的每个音调时，该单元被使能以进行通信。