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1.发明授权
公开(公告)号：US5692019A
公开(公告)日：1997-11-25
申请号：US664747
申请日：1996-06-17
申请人： Chun-Ye Susan Chang , Jian-Cheng Huang , Lu Chang , Lorenzo Ponce De Leon , David Petreye , James Michael Keba , Clinton C. Powell, II
发明人： Chun-Ye Susan Chang , Jian-Cheng Huang , Lu Chang , Lorenzo Ponce De Leon , David Petreye , James Michael Keba , Clinton C. Powell, II
摘要： A communication device (400) with a polarization diversity antenna configuration, having a first antenna (410) with a first plane of polarization and a second antenna (412) with a second plane of polarization. Signal strength of a demodulated signal when the antenna switch (420) is coupled to one of the antennas (410, 412) is measured by a signal strength measuring circuit (440) to generate a short-term average signal power (SA) representing signal strength over a first predetermined number of symbol periods, a medium-term average signal power (MA) representing signal strength over a second predetermined number of symbol periods, and a long-term average signal power (LA) representing signal strength over a third predetermined number of symbol periods, greater than the second predetermined number of symbol periods and first predetermined number of symbol periods. Switching between antennas (410, 412) is made in response to differences between SA, MA and LA.
摘要翻译： 具有极化分集天线配置的通信设备（400）具有具有第一偏振平面的第一天线（410）和具有第二偏振平面的第二天线（412）。 天线开关（420）耦合到天线（410,412）之一时的解调信号的信号强度由信号强度测量电路（440）测量，以产生表示信号的短期平均信号功率（SA） 超过第一预定数量的符号周期的强度，表示第二预定数量的符号周期的信号强度的中期平均信号功率（MA）以及表示超过第三预定数量的信号强度的长期平均信号功率（LA） 符号周期的数量，大于第二预定数量的符号周期和第一预定数量的符号周期。 响应于SA，MA和LA之间的差异，在天线（410,412）之间进行切换。
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2.发明授权Method in a selective call receiver for synchronizing to a multi-level radio signal 失效用于同步到多电平无线电信号的选呼接收机中的方法
公开(公告)号：US5960042A
公开(公告)日：1999-09-28
申请号：US886356
申请日：1997-07-01
IPC分类号： H04L7/033 , H04L27/152 , H04L25/49
CPC分类号： H04L7/0334 , H04L27/1525
摘要： A selective call receiver (800), including a receiver circuit (101) and a processor (810), is used for synchronizing an internal reference to symbol edges of a plurality of symbols in a multi-level radio signal transmitted by a radio communication system. To perform this function the processor (810) is adapted to cause the receiver circuit (101) to demodulate the multilevel radio signal to in-phase and quadrature signals (108, 106), convert the in-phase and quadrature signals (108, 106) to a sequence of state transitions representative of the plurality of symbols, detect at least one same state transition from the sequence of state transitions, and synchronize the internal reference to the at least one symbol edge of the plurality of symbols based on the at least one same state transition.
摘要翻译： 包括接收机电路（101）和处理器（810）的选呼接收机（800）用于使内部参考与由无线电通信系统发送的多级无线电信号中的多个符号的符号边缘同步 。 为了执行该功能，处理器（810）适于使得接收机电路（101）将多电平无线电信号解调为同相和正交信号（108,106），将同相和正交信号（108,106） ）到表示所述多个符号的状态转移序列，从所述状态转换序列检测至少一个相同的状态转换，并且基于至少基于所述多个符号的所述至少一个符号边缘的所述至少一个符号边沿来同步所述内部参考 同一个国家过渡。
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3.发明授权
公开(公告)号：US5673197A
公开(公告)日：1997-09-30
申请号：US495857
申请日：1995-06-28
CPC分类号： H04L25/062
摘要： An apparatus and method for updating upper and lower thresholds in peak and valley systems. The apparatus includes comparators which determine which peaks or valleys are eligible for use in the calculation of upper or lower threshold levels. The comparators output the eligible peaks and valleys into statistical blocks that calculate the mean of the peaks and valleys as well as the deviation over a predetermined number of samples. Additional comparators compare either the mean deviation, standard deviation, or variance of the eligible peaks and valleys to predetermined deviation thresholds to determine whether the mean peak or mean valley should be used to calculate update thresholds. The apparatus further includes memory elements that store the mean peak or mean valley values used in the calculation of upper or lower thresholds.
摘要翻译： 一种用于更新峰谷系统中上限和下限阈值的装置和方法。 该装置包括比较器，其确定哪些峰或谷有资格用于计算上限或下限阈值水平。 比较器将合格的峰和谷输出到计算峰和谷的平均值以及预定数量样本的偏差的统计块中。 额外的比较器可将平均偏差，标准偏差或符合条件的峰谷的方差与预定的偏差阈值进行比较，以确定平均峰值还是平均谷值应用于计算更新阈值。 该装置还包括存储元件，其存储在计算上限或下限阈值时使用的平均峰值或平均谷值。
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公开(公告)号：US5943378A
公开(公告)日：1999-08-24
申请号：US691081
申请日：1996-08-01
CPC分类号： H04L7/0334 , H04L7/0083
摘要： A clock recovery circuit for recovering a symbol clock (226) includes a level decoder (210) for determining one of a plurality of received states of a demodulated signal (105) during each symbol period of the symbol clock (226). Each of the plurality of received states corresponds to one of at least two modulation levels. The level decoder (210) generates for each of the plurality of received states a sign signal (212) having transitions at central threshold transition times and a magnitude signal (211). An edge selector (220) determines selected central threshold transition times. A synchronizable clock (225) is synchronized by the selected central threshold transition times, resulting in a significant reduction of symbol clock (226) jitter.
摘要翻译： 用于恢复符号时钟（226）的时钟恢复电路包括用于在符号时钟（226）的每个符号周期期间确定解调信号（105）的多个接收状态之一的电平解码器（210）。 多个接收状态中的每一个对应于至少两个调制电平之一。 电平解码器（210）针对多个接收状态中的每一个生成在中心阈值转换时间具有转变的符号信号（212）和幅度信号（211）。 边缘选择器（220）确定所选择的中心阈值转换时间。 同步时钟（225）通过所选择的中央阈值转换时间同步，导致符号时钟（226）抖动的显着减少。
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5.发明授权Method and apparatus for detecting data symbols in a diversity communication system 失效用于在分集通信系统中检测数据符号的方法和装置
公开(公告)号：US5687197A
公开(公告)日：1997-11-11
申请号：US499261
申请日：1995-07-07
摘要： A data receiver (110) for processing multiple signals includes a receiving circuit (120) for demodulating at least first and second signals and a selector (125) coupled to the receiving circuit (120) for comparing the at least first and second signals to estimated peak and valley values. The selector (125) generates error values associated with the at least first and second signals and selects a data symbol associated with one of the estimated peak and valley values based on the error values. A timing circuit (140, 150) activates the selector (125) at predetermined times, and a controller (140) coupled to the selector (125) and the timing circuit (140, 150) recovers information in accordance with the data symbol and other data symbols.
摘要翻译： 用于处理多个信号的数据接收器（110）包括用于解调至少第一和第二信号的接收电路（120）和耦合到所述接收电路（120）的选择器（125），用于将所述至少第一和第二信号进行比较以估计 峰值和谷值。 选择器（125）产生与至少第一和第二信号相关联的误差值，并且基于误差值选择与估计的峰值和谷值之一相关联的数据符号。 定时电路（140,150）在预定时间激活选择器（125），并且耦合到选择器（125）和定时电路（140,150）的控制器（140）根据数据符号和其他 数据符号。
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6.发明授权Method and apparatus for selectively encoding digital messages in a communication system 失效用于在通信系统中选择性地编码数字消息的方法和装置
公开(公告)号：US5652783A
公开(公告)日：1997-07-29
申请号：US496563
申请日：1995-06-29
CPC分类号： H04W88/187
摘要： A communication system providing selective encoding of digital messages (408) comprising a plurality of transmitting devices (116) and a plurality of receiving devices (122). The transmitting devices (116) transmit an encoded address (404), encoded message vector (406) in a first portion of the message, and digital message (408) in a second portion of the message. The digital message (408) is encoded in the second portion of the message with an error correction code if the digital message is a data message (414), and without the overhead of an error correction code if the digital message (408) is a voice message (410). The receiving device (122) decodes the encoded address (404), encoded message vector (406), and digital message (408) transmitted by the transmitting devices (116) in the first and second portion of the message. The receiving device (122) determines the encoding method of the digital message (408) based on the message type received in the message vector (406), and thereafter decodes the digital message.
摘要翻译： 提供包括多个发送设备（116）和多个接收设备（122）的数字消息（408）的选择性编码的通信系统。 发送设备（116）在消息的第一部分中传送编码地址（404），编码消息向量（406）以及消息的第二部分中的数字消息（408）。 如果数字消息是数据消息（414），数字消息（408）被编码在具有纠错码的消息的第二部分中，并且如果数字消息（408）是 语音留言（410）。 接收设备（122）在消息的第一和第二部分中对由发送设备（116）发送的编码地址（404），编码消息向量（406）和数字消息（408）进行解码。 接收设备（122）基于在消息向量（406）中接收的消息类型来确定数字消息（408）的编码方法，然后对数字消息进行解码。
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