公开(公告)号：US20070286662A1

公开(公告)日：2007-12-13

申请号：US11448361

申请日：2006-06-07

申请人： Eric J. King

发明人： Eric J. King

IPC分类号： B41J5/00

CPC分类号： G06F3/0219

摘要： A convertible computer keyboard has two sections, a QWERTY typing and a key/numpad section. The sections are configured to be used as a single unit or independently of one another. Connection of the sections is made possible by the use of a channeled track or equivalent connection system, which allows a rigid attachment of the key/numpad section on either side of the QWERTY section. The sections of the keyboard can also be connected as a unit or used separately, with wireless connectors which transmit electronic input signals to the computer. As a result of its convertible nature, the keyboard has the flexibility to be configured in a number of ways, thus ergonomically enhancing keyboard use and versatility, especially for video gamers.

摘要翻译： 可转换计算机键盘有两个部分，一个QWERTY打字和一个键/数字键盘部分。 这些部分被配置为用作单个单元或彼此独立地使用。 通过使用通道轨道或等效连接系统可以实现各部分的连接，从而可以在QWERTY部分的任一侧刚性附加键/数字键盘部分。 键盘的部分也可以单独连接或单独使用，无线连接器将电子输入信号传输到计算机。 由于其可转换性，键盘具有以多种方式配置的灵活性，从而符合人体工程学，增强了键盘的使用和多功能性，特别是对于视频游戏玩家而言。

公开(公告)号：US06693954B1

公开(公告)日：2004-02-17

申请号：US09550786

申请日：2000-04-17

申请人： Eric J. King ,  Peijun Shan

发明人： Eric J. King ,  Peijun Shan

IPC分类号： H04B1707

CPC分类号： H04B1/7085 ,  H04B2001/70935

摘要： The receiver receives a complex spread spectrum signal modulated using complementary code keying. The received signal is down converted and cross correlated with code words using a Fast Walsh Transform. The peak magnitudes resulting from the Fast Walsh Transform are selected for a period before, during, and after an expected symbol boundary. The relative magnitudes of the early, on-time and late measurements are compared to determine which output has the largest magnitude. If the on-time measurement is the largest, symbol tracking continues without a timing adjustment. If the early measurement has the greatest magnitude, then the tracking timing is adjusted one period downward to shorten the period expected before the next symbol boundary. If the late measurement has the largest magnitude, then the tracking timing is increased by one sample period to increase the period expected before the next symbol boundary. This process repeats itself to provide accurate symbol tracking.

摘要翻译： 接收机接收使用补码代码调制的复扩展频谱信号。 接收的信号被下变频，并使用快速沃尔什变换与码字交叉相关。 在预期符号边界之前，期间和之后的期间选择由快速沃尔什变换产生的峰值幅度。 比较早期，准时和晚期测量的相对幅度，以确定哪个输出具有最大的幅度。 如果接通时间测量是最大的，则符号跟踪继续进行而不进行时序调整。 如果早期测量具有最大幅度，则跟踪定时被调整一个周期，以缩短在下一个符号边界之前所期望的期间。 如果后期测量具有最大幅度，则跟踪定时增加一个采样周期以增加在下一个符号边界之前预期的期间。 该过程重复提供准确的符号跟踪。

公开(公告)号：US06661834B1

公开(公告)日：2003-12-09

申请号：US09550565

申请日：2000-04-17

申请人： Peijun Shan ,  Eric J. King

发明人： Peijun Shan ,  Eric J. King

IPC分类号： H04B169

CPC分类号： H04L27/0014 ,  H04B2001/70706 ,  H04L2027/003 ,  H04L2027/0057 ,  H04L2027/0067

摘要： Carrier recovery control circuitry incorporates a dual-phase accumulator architecture to facilitate carrier recovery in spread spectrum communications. The associated receiver is configured to downconvert and despread the spread spectrum signal to a baseband signal. Demodulation circuitry operating on the baseband signals provides an error signal representing the difference between the sampled signal and the ideal symbol. This error signal, through a loop filter, is to provided to a first phase accumulator running at the symbol rate. The first phase accumulator accumulates a first phase correction adjustment for each symbol duration. A second phase accumulator running at the sampling rate is set by the output of the first phase accumulator to cause the second phase accumulator to accumulate an additional phase correction adjustment that is dependent upon the first phase correction adjustment and the sample rate. The resultant phase correction adjustment value is used to adjust the complex mixer controlling carrier recovery.

摘要翻译： 载波恢复控制电路结合了双相累加器结构，以便于扩频通信中的载波恢复。 相关联的接收机被配置为将扩频信号下变频和解扩到基带信号。 在基带信号上工作的解调电路提供了表示采样信号和理想符号之间差异的误差信号。 该错误信号通过环路滤波器提供给以符号速率运行的第一相位累加器。 第一相位累加器针对每个符号持续时间积累第一相位校正调整。 以采样率运行的第二相位累加器由第一相位累加器的输出设置，以使第二相位累加器积累依赖于第一相位校正调整和采样率的附加相位校正调整。 所得到的相位校正调整值用于调节复合混频器控制载波恢复。

公开(公告)号：US06728324B1

公开(公告)日：2004-04-27

申请号：US09629588

申请日：2000-07-31

申请人： Peijun Shan ,  Eric J. King

发明人： Peijun Shan ,  Eric J. King

IPC分类号： H04D106

CPC分类号： H04B1/7107 ,  H04B1/7113 ,  H04B1/7115 ,  H04B1/7117 ,  H04B2201/70707

摘要： An equalizer operates on chip or sub-chip resolution input samples of a received spread-spectrum multipath signal to remove interference from one or more secondary propagation path signals within the multipath signal. The equalizer may be configured for cancellation of secondary signals arriving before and after a main propagation path signal, referred to as pre- and post-cursor signals, respectively. An associated communications system provides the equalizer with a path coefficient and delay value for each secondary path signal for which cancellation is desired. With its unique architecture, the equalizer cancels secondary signals displaced in time by amounts as small as the input sample time resolution or by amounts exceeding multiple chips, or even multiple symbols. The length of sample delay buffers within the equalizer, in combination with the input sample rate, determines the maximum secondary signal delay accommodated by the equalizer. Post-cursor cancellation requires only a hard-decision value buffer, while pre-cursor cancellation requires an additional input or compensated sample buffer. The equalizer makes a hard-decision about the phase value of each input sample and buffers these hard-decision values for use in secondary signal cancellation. Hard-decision values delayed from current input samples by delay times corresponding to the path delays of the secondary signals for which cancellation is desired are used to rotate the phase of corresponding path coefficients. These adjusted values are fed back for subtraction from input samples for post-cursor cancellation, and fed forward for subtraction from delayed input samples for pre-cursor cancellation.

摘要翻译： 均衡器对接收的扩频多径信号的芯片或子芯片分辨率输入样本进行操作，以去除多径信号内的一个或多个次传播路径信号的干扰。 均衡器可以被配置为分别消除被称为前和后光标信号的主传播路径信号之前和之后到达的二次信号。 相关联的通信系统为均衡器提供了对于期望消除的每个辅助路径信号的路径系数和延迟值。 通过其独特的架构，均衡器可以消除随时间移动的二次信号，其量小于输入采样时间分辨率或数量超过多个芯片，甚至多个符号。 均衡器内的采样延迟缓冲器的长度与输入采样率的组合决定了均衡器容纳的最大辅助信号延迟。 光标后消除只需要一个硬判决值缓冲器，而前置光标消除则需要额外的输入或补偿采样缓冲器。 均衡器对每个输入采样的相位值作出硬判决，并缓冲这些硬判决值用于二次信号消除。 使用与当前输入样本延迟的延迟时间相对应的期望消除的次级信号的路径延迟的硬判决值来旋转相应路径系数的相位。 这些调整后的值被反馈，用于从输入样本中进行减号以进行后置光标取消，并将其从延迟输入样本中进行前馈以进行前置取消。

公开(公告)号：US06700929B1

公开(公告)日：2004-03-02

申请号：US09628972

申请日：2000-07-31

申请人： Peijun Shan ,  Eric J. King

发明人： Peijun Shan ,  Eric J. King

IPC分类号： H04B1700

CPC分类号： H04B1/7115 ,  H04B1/7107 ,  H04B1/7113 ,  H04B1/7117 ,  H04B1/7183

摘要： A training method provides an advantageous technique for estimating secondary propagation path parameters based on learning propagation path characteristics for a selected number of secondary propagation path signals. In a multipath environment, a received radio signal comprises multiple received signals, each received through a different signal propagation path. The strongest multipath signal is deemed the main path signal, while the remaining multipath signals are termed secondary path signals. In some types of direct-sequence, spread spectrum communications systems, significant secondary signals must be canceled from the received multipath signal to achieve desired receiver performance, while in other types of systems, such secondary signals may be used to enhance the signal-to-noise ratio of the received signal. In either case, the various multipath signals must be accurately characterized. The training method includes a course search technique that yields initial identification of the significant secondary path signals, and further includes techniques for characterizing the magnitude, phase, and path delay, all relative to the main path signal for secondary path signal of interest. The training method employs differential decoding and sample phase slicing to improve parameter estimation accuracy, and further includes phase correlation operations to determine secondary path delay, where such delays may have delay spreads that exceed a transmitted signal symbol period.

摘要翻译： 训练方法提供了一种用于基于所选次数传播路径信号的学习传播路径特性来估计二次传播路径参数的有利技术。 在多径环境中，接收的无线电信号包括多个接收信号，每个接收信号通过不同的信号传播路径接收。 最强的多路径信号被认为是主路径信号，而剩余的多路径信号被称为次路径信号。 在一些类型的直接序列扩频通信系统中，必须从接收的多路径信号中消除重要的二次信号以实现期望的接收机性能，而在其它类型的系统中，这样的辅助信号可用于增强信号 - 接收信号的噪声比。 在任一种情况下，必须准确地表征各种多径信号。 训练方法包括产生重要二次路径信号的初始识别的课程搜索技术，并且还包括用于表征幅度，相位和路径延迟的技术，全部相对于感兴趣的辅助路径信号的主路径信号。 训练方法采用差分解码和采样相位切片来提高参数估计精度，并且还包括相位相关运算以确定次级路径延迟，其中这种延迟可能具有超过发射信号符号周期的延迟扩展。

公开(公告)号：US06647077B1

公开(公告)日：2003-11-11

申请号：US09628996

申请日：2000-07-31

申请人： Peijun Shan ,  Eric J. King

发明人： Peijun Shan ,  Eric J. King

IPC分类号： H04L100

CPC分类号： H04B1/7115 ,  H04B1/7113 ,  H04B1/7117 ,  H04B1/7183

摘要： A training circuit includes resources for processing magnitude and phase information received in a main propagation path signal with magnitude and phase information concurrently received in a secondary propagation path signal to determine values for magnitude, phase, and time offset of the secondary propagation path signal relative to the main propagation path signal. Differential decoding circuitry within the training circuit provides a correlation circuit, also in the training circuit, with differentially decoded sequences of symbol phase values derived from concurrent main and secondary signal propagation path symbol phase value sequences provided to the training circuit by an associated communications receiver. Operating on theses phase value sequences, the correlation circuit determines the time offset between the main and secondary propagation path signals based on determining the correspondence between symbol phase values received via the main propagation path signal and those concurrently received via the secondary propagation path signal. The training circuit can identify time offsets less than or greater than a symbol period, for either leading or lagging secondary path time offsets. A phase difference circuit, further included in the training circuit, determines a phase offset for the secondary propagation path signal relative to the main propagation path signal using main and secondary propagation path symbol phase values in combination with the time offset information. The relative magnitude, phase, and time information represents a characterization of the secondary propagation path with respect to the main propagation path. This characterization information may be used to improve reception performance or cancel multipath interference.

摘要翻译： 训练电路包括用于处理在主传播路径信号中接收的幅度和相位信息的资源，其中幅度和相位信息在次传播路径信号中同时接收，以确定次传播路径信号相对于第二传播路径信号的幅度，相位和时间偏移的值 主传播路径信号。 训练电路内的差分解码电路也在训练电路中提供相关电路，该差分解码序列的符号相位值是由相关联的通信接收机提供给训练电路的并行主信号传播路径符号相位值序列。 基于这些相位值序列，相关电路基于确定通过主传播路径信号接收的符号相位值与经由次传播路径信号同时接收的符号相位值之间的对应关系，确定主传播路径信号与辅助传播路径信号之间的时间偏移。 训练电路可以识别小于或大于符号周期的时间偏移，用于前导或滞后次要路径时间偏移。 进一步包括在训练电路中的相位差电路使用与时间偏移信息相结合的主传播路径符号相位值和次传播路径符号相位值来确定相对于主传播路径信号的次传播路径信号的相位偏移。 相对幅度，相位和时间信息表示相对于主传播路径的次传播路径的表征。 该表征信息可用于改善接收性能或消除多路径干扰。

公开(公告)号：US06674818B1

公开(公告)日：2004-01-06

申请号：US09550567

申请日：2000-04-17

申请人： Eric J. King ,  Peijun Shan

发明人： Eric J. King ,  Peijun Shan

IPC分类号： H03D100

CPC分类号： H04L23/02

摘要： The present invention groups a set of N, nearly orthogonal, CCK code words into M subgroups, with each subgroup consisting of N/M orthogonal code words. For the 64-ary CCK communication standard for wireless local area networks (WLAN), N is 64 and M is preferably 8. Based on the orthogonal subgrouping, most significant bit (MSB) comparitors, instead of full-scale comparitors, are used to compare cross-correlations for each subgroup. In the subgroup containing the desired maximum correlation, all other cross-correlations, except the maximum, are zero in an ideal case, or very close to zero in a noisy environment due to the selected orthogonality. The maximum correlation value can be distinguished by looking at only the most significant bit or bits among all the cross-correlations. In the subgroups that do not contain the global, maximum correlation value, it does not matter which cross-correlation value is picked. The maximum correlation from all the subgroups, which will include the global maximum from one of the subgroups, are monitored to select the maximum correlation value and the corresponding code word.

摘要翻译： 本发明将一组N个近似正交的CCK码字分组为M个子组，每个子组由N / M个正交码字组成。 对于无线局域网（WLAN）的64进制CCK通信标准，N为64，M优选为8.基于正交子分组，使用最高有效位（MSB）比较器而不是全尺寸比较器 比较每个子组的互相关。 在包含期望的最大相关性的子组中，除了最大值之外的所有其他互相关在理想情况下为零，或者由于所选择的正交性，在噪声环境中非常接近于零。 可以通过仅查看所有交叉相关中的最高有效位或比特来区分最大相关值。 在不包含全局，最大相关值的子组中，选择哪个互相关值无关紧要。 监测来自所有子组的最大相关性，其将包括来自一个子组的全局最大值，以选择最大相关值和相应的代码字。