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1.发明授权Symbol synchronizer based on eye pattern characteristics having variable adaptation rate and adjustable jitter control, and method therefor 失效基于具有可变自适应速率和可调节抖动控制的眼图特征的符号同步器及其方法
公开(公告)号：US6084931A
公开(公告)日：2000-07-04
申请号：US962267
申请日：1997-10-31
CPC分类号： H04L7/0334 , H04L7/007
摘要： A symbol synchronizer (10) for use in a communication device. The symbol synchronizer (10) comprises a sampling circuit (100) which samples the demodulated signal at a plurality of sampling events for each symbol period to generate three sample values at each sampling event. An eye pattern detector circuit (200) generates eye pattern characteristic information based on the three sample values, and outputs a symbol pulse in response to detecting eye pattern characteristic information consistent with a symbol center. A synchronization noise mask circuit (400) filters symbol pulses that occur during a predetermined period of time after a first symbol pulse is detected for each symbol period. A synchronization adjust circuit (500) generates a synchronization pulse during each symbol period at a particular instant of time during the symbol period based on a history of the occurrences of symbol pulses for a current symbol period and for prior symbol periods.
摘要翻译： 一种用于通信设备的符号同步器（10）。 符号同步器（10）包括采样电路（100），其对于每个符号周期的多个采样事件对解调信号进行采样，以在每个采样事件处产生三个采样值。 眼图检测器电路（200）基于三个采样值产生眼图特征信息，并且响应于与符号中心一致的检测眼图特征信息而输出符号脉冲。 同步噪声屏蔽电路（400）对每个符号周期检测到第一个符号脉冲之后的预定时间段内的符号脉冲进行滤波。 同步调整电路（500）在符号周期内的特定时刻的每个符号周期期间，基于当前符号周期的符号脉冲的历史和先前的符号周期来生成同步脉冲。
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2.发明授权Method and apparatus for improving perceived quality of a stored voice message in a communication receiver 失效用于提高通信接收机中存储的语音消息的感知质量的方法和装置
公开(公告)号：US5524279A
公开(公告)日：1996-06-04
申请号：US345016
申请日：1994-11-23
CPC分类号： H04B17/318
摘要： A method and apparatus improves the perceived quality of a voice message received in a radio signal by a radio communication receiver (108) having voice storage capability and operating in a fading signal environment. A monitor (203) repeatedly monitors (304) a received radio signal quality indication during intervals of reception of contiguous portions of the voice message, and a selective storage element (228) selectively stores (308) for later playback (404) only those portions of the voice message received during the intervals of reception having a radio signal quality indication higher than a predetermined threshold.
摘要翻译： 一种方法和装置通过具有语音存储能力并在衰落信号环境中操作的无线电通信接收机（108）来改善在无线电信号中接收的语音消息的感知质量。 监视器（203）在接收语音消息的连续部分的间隔期间重复地监视（304）接收到的无线电信号质量指示，并且选择性存储元件（228）仅选择性地存储（308）用于稍后播放（404）那些部分 在具有高于预定阈值的无线电信号质量指示的接收间隔期间接收到的语音消息。
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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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4.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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公开(公告)号：US06560447B2
公开(公告)日：2003-05-06
申请号：US09798216
申请日：2001-03-05
申请人： Mahibur Rahman , Christopher T. Thomas , Robert Schweickert , James Mittel , Clinton C. Powell, II
发明人： Mahibur Rahman , Christopher T. Thomas , Robert Schweickert , James Mittel , Clinton C. Powell, II
IPC分类号： H04B106
CPC分类号： H04B1/30 , H03D3/006 , H03D7/161 , H04L25/061
摘要： A DC offset correction circuit (68) provides DC offset correction within a receiver (50) for receiving and processing a radio frequency signal (28) within a radio communication system (30). The DC offset correction circuit (68) includes a feedback loop (88) for shifting a digital signal (80) by a programmable amount; and a coarse DC offset correction path (104) coupled to the feedback loop (88) for performing coarse DC offset correction.
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6.发明授权Radio communication device and method for generating threshold levels in a radio communication device for receiving four-level signals 失效一种用于在用于接收四电平信号的无线电通信装置中产生阈值电平的无线电通信装置和方法
公开(公告)号：US5670951A
公开(公告)日：1997-09-23
申请号：US503366
申请日：1995-07-17
CPC分类号： G08B5/229 , H04L25/062
摘要： A symbol detector (110) includes an analog-to-digital converter (115) for converting signal voltages to digital values and peak and valley counters (310, 315) for tracking the digital values to determine peak and valley values associated with high and low voltages of the signal. The symbol detector (110) further includes calculation circuitry (356) for calculating upper, lower, and center thresholds based on the peak and valley values and a decoder (125) for generating data symbols in accordance with the upper, lower, and center thresholds.
摘要翻译： 符号检测器（110）包括用于将信号电压转换为数字值的模拟 - 数字转换器（115）和用于跟踪数字值的峰值和谷值计数器（310,315），以确定与高和低相关联的峰值和谷值 信号电压。 符号检测器（110）还包括用于基于峰值和谷值计算上，下和中心阈值的计算电路（356）和用于根据上，下和中心阈值产生数据符号的解码器（125） 。
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7.发明授权
公开(公告)号：US5602877A
公开(公告)日：1997-02-11
申请号：US520322
申请日：1995-08-28
IPC分类号： H03D3/00 , H04L27/233 , H04L27/22
CPC分类号： H03D3/007 , H04L27/2332
摘要： A radio communication device (100) for recovering information from a received signal includes a demodulator (110) for demodulating the received signal into in-phase (I) and quadrature (Q) components and a multiplier (115) for multiplying the I and Q components together to generate a multiplied waveform. A polarity detector (125) coupled to the multiplier (115) determines from the multiplied waveform a polarity variable indicative of a data symbol, and a processor (135) recovers the information from the received signal in accordance with the data symbol.
摘要翻译： 一种用于从接收信号中恢复信息的无线电通信设备（100）包括用于将接收信号解调为同相（I）和正交（Q）分量的解调器（110）和用于将I和Q 组件一起产生一个相乘的波形。 耦合到乘法器（115）的极性检测器（125）根据乘法波形确定指示数据符号的极性变量，并且处理器（135）根据数据符号从接收到的信号中恢复信息。
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8.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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公开(公告)号：US5799043A
公开(公告)日：1998-08-25
申请号：US867498
申请日：1997-06-02
CPC分类号： H04L25/062
摘要： A selective call unit (800) comprising a receiver (100) and a processor (810) is used for decoding a 2-level radio signal. The processor (810) is adapted to convert in-phase and quadrature signals generated by the receiver (100) to a sequence of state transitions representative of the plurality of symbols. For each symbol in the plurality of symbols, the processor (810) counts the sequence of state transitions during a symbol period, and compares the recorded count to a predetermined threshold, thereby generating a comparison result. The processor (810) then calculates a bit decision threshold level based on an average of the comparison result for each symbol in the plurality of symbols. For each symbol in a plurality of subsequent symbols, the processor (810) then compares the bit decision threshold level to the sequence of state transitions counted during a symbol period to decode a digital logic level therefrom.
摘要翻译： 包括接收机（100）和处理器（810）的选呼单元（800）用于对2级无线电信号进行解码。 处理器（810）适于将由接收机（100）产生的同相和正交信号转换为表示多个符号的状态转换序列。 对于多个符号中的每个符号，处理器（810）在符号周期期间对状态转换序列进行计数，并将记录的计数与预定阈值进行比较，从而生成比较结果。 然后，处理器（810）基于多个符号中的每个符号的比较结果的平均值来计算比特判定阈值水平。 对于多个后续符号中的每个符号，处理器（810）然后将比特判定阈值电平与在符号周期期间计数的状态转换序列进行比较，以从其中解码数字逻辑电平。
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10.发明授权Method and communication system for improved channel scanning and link establishment determinations 失效用于改进信道扫描和链路建立确定的方法和通信系统
公开(公告)号：US5459873A
公开(公告)日：1995-10-17
申请号：US100784
申请日：1993-08-21
CPC分类号： H04B7/0802 , H04B7/0604 , H04W36/30
摘要： A method for improved channel scanning and link establishment determinations in a communication system (30) having at least one base station (36) with at least two antennas (32 and 34) and at least one portable unit (38 or 40) capable of linking with the base station, comprises the steps at the base station of determining (104) whether a communication resource on the base station is operating as a control channel and switching or alternating (106) antennas periodically if the communication resource operates as a control channel. Otherwise, the antennas are switched in accordance with a diversity algorithm (54) if the communication resource operates as a traffic bearing channel.
摘要翻译： 一种用于在具有至少一个具有至少两个天线（32和34）的基站（36）和至少一个能够链接的便携式单元（38或40）的通信系统（30）中改进信道扫描和链路建立确定的方法 如果通信资源作为控制信道操作，基站的步骤包括：确定（104）基站上的通信资源是否作为控制信道工作，周期性地切换或交替（106）天线。 否则，如果通信资源作为业务承载信道操作，则根据分集算法（54）切换天线。
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