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公开(公告)号：US5818867A
公开(公告)日：1998-10-06
申请号：US708807
申请日：1996-09-09
CPC分类号： H04B1/707 , H04L27/2014
摘要： A modulator device is disclosed for a spread spectrum communication system which generates a modulated signal from incoming data. The device includes a QPSK portion for separating the incoming data into two data channels and for further spreading the two channels over a wide bandwidth according to a predetermined spreading code. A phase mapping element coupled to the QPSK portion for processing both channels in order to minimize spectral regrowth of the modulated signal by preventing the RF envelope deviation from going close to zero. Pulse shaping elements coupled to the phase mapping element for further processing each channel in order to improve the modulator spectral efficiency and minimize adjacent channel interference. A quad-mixer coupled to the pulse shaping elements for combining both channels into a recombined signal and for further modulating the recombined signal according to a predetermined carrier frequency.
摘要翻译： 公开了一种用于从输入数据生成调制信号的扩频通信系统的调制器装置。 该装置包括用于将输入数据分离为两个数据信道并用于根据预定扩展码在宽带宽上进一步扩展两个信道的QPSK部分。 耦合到QPSK部分以用于处理两个信道的相位映射元件，以便通过防止RF包络偏差接近于零来最小化调制信号的频谱再生长。 脉冲整形元件耦合到相位映射元件，用于进一步处理每个通道，以便提高调制器频谱效率并使相邻信道干扰最小化。 耦合到脉冲整形元件的四混频器，用于将两个信道组合成重组信号，并根据预定载波频率进一步调制重组信号。
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2.发明授权公开(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。
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公开(公告)号：US5732106A
公开(公告)日：1998-03-24
申请号：US465444
申请日：1995-06-05
CPC分类号： H04L25/03834
摘要： Disclosed is a digital pulse shaping circuit for reducing undesirable frequency components in subsequent data modulated transmissions, which circuit can be easily manufactured as a monolithic integrated circuit. In a preferred embodiment, the pulse shaping circuit employs an edge detector circuit to detect data transitions of an incoming serial data stream. Upon a data edge detection, the edge detector provides a control signal to a digital counter to enable the counter to begin counting applied clock pulses and generate a linear count. The linear count is provided to a decoding circuit, which generates an output word as a nonlinear function of the value of the count. The decoded output word then drives a digital modulator which modulates an RF carrier to provide wireless data transmission with improved spectral efficiency.
摘要翻译： 公开了一种数字脉冲整形电路，用于减少随后的数据调制传输中的不期望的频率分量，该电路可以容易地制造为单片集成电路。 在优选实施例中，脉冲整形电路采用边缘检测器电路来检测输入的串行数据流的数据转换。 在进行数据边缘检测时，边缘检测器向数字计数器提供控制信号，使计数器能够开始计数施加的时钟脉冲并产生线性计数。 将线性计数提供给解码电路，该解码电路产生输出字作为计数值的非线性函数。 解码的输出字然后驱动数字调制器，其调制RF载波以提供具有改进的频谱效率的无线数据传输。
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4.发明授权System and method employing concatenated spreading sequences to provide data modulated spread signals having increased data rates with extended multi-path delay spread 有权使用级联扩展序列的系统和方法提供具有扩展的多径延迟扩展的具有增加的数据速率的数据调制扩展信号公开(公告)号：US06674790B1
公开(公告)日：2004-01-06
申请号：US10053695
申请日：2002-01-24
申请人： Donald J. Rasmussen , Larry W. Koos
发明人： Donald J. Rasmussen , Larry W. Koos
IPC分类号： H04B1707
CPC分类号： H04J13/107 , H04B1/7115 , H04B2201/709709
摘要： A system and method for enabling a transmitter employing signal spreading techniques to increase the data rate of the transmitted modulated signal without reducing the multi-path delay spread. Specifically, the system and method use concatenated spreading sequences to provide data modulated spread signals having increased data rates with extended multi-path delay spread. The system and method therefore removes the one-to-one relationship between the repetitive spreading code length and maximum multi-path delay spread of a data modulated spread signal, to thus increase the data rate for a given multi-path delay spread while preserving the autocorrelation and cross-correlation properties of the individual spreading sequences.
摘要翻译： 一种用于使得采用信号扩展技术的发射机能够在不减少多径延迟扩展的情况下增加发射调制信号的数据速率的系统和方法。 具体地，该系统和方法使用连接的扩展序列来提供具有扩展的多径延迟扩展的具有增加的数据速率的数据调制扩展信号。 因此，该系统和方法消除了数据调制扩展信号的重复扩展码长度和最大多径延迟扩展之间的一对一关系，从而增加给定多径延迟扩展的数据速率，同时保留 个体扩展序列的自相关和互相关性质。
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