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1.发明授权Method and apparatus in a messaging system for limiting an interval of carrier cancellation 失效用于限制载波消除间隔的消息系统中的方法和装置
公开(公告)号：US06044276A
公开(公告)日：2000-03-28
申请号：US959409
申请日：1997-10-28
申请人： Steven Jeffrey Goldberg , Brian Joseph Budnik , Thomas Aloysius Sexton , Stephen Rocco Carsello
发明人： Steven Jeffrey Goldberg , Brian Joseph Budnik , Thomas Aloysius Sexton , Stephen Rocco Carsello
CPC分类号： H04B7/022 , H04B2201/709709
摘要： In a messaging system having a plurality of simulcasting base transmitters (104), a plurality of pseudorandom sequence generators (216) are provided (402) for the plurality of base transmitters. The plurality of pseudorandom sequence generators are arranged (403) to ensure that they generate a plurality of pseudorandom sequences having sub-sequences that are different from one another during concurrent transmissions by the plurality of base transmitters. A cancellation-affecting parameter of the plurality of base transmitters is adjusted (404, 406, 408) in accordance with the plurality of pseudorandom sequences during the simulcast transmission from the plurality of base transmitters to limit intervals of carrier cancellation.
摘要翻译： 在具有多个同时播送基站发射机（104）的消息系统中，为多个基站发射机提供多个伪随机序列发生器（402）（402）。 布置多个伪随机序列发生器（403）以确保它们在多个基站发射机的并发传输期间产生具有彼此不同的子序列的多个伪随机序列。 在从多个基站发射机的联播传输期间，根据多个伪随机序列来调整多个基站发射机的消除影响参数，以限制载波消除的间隔。
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2.发明授权公开(公告)号：US06529566B1
公开(公告)日：2003-03-04
申请号：US09387090
申请日：1999-08-31
IPC分类号： H04L2706
CPC分类号： H04L25/0262
摘要： A processor (202) delays (906) a baseband digital signal by a symbol duration, thereby generating a delayed baseband digital signal. The processor adds (908) the baseband digital signal to the delayed baseband digital signal, thereby generating a summed signal; and divides (910) the summed signal by two, thereby generating a threshold signal. The processor also delays (912) the baseband digital signal by one-half the symbol duration, thereby generating a half-delayed signal; and subtracts (914) the threshold signal from the half-delayed signal, thereby generating a candidate signal. In addition, the processor searches (916) for a zero crossing in the candidate signal, and generates (918) a pulse in response to finding the zero crossing.
摘要翻译： 处理器（202）将基带数字信号延迟（906）码元持续时间，从而产生延迟的基带数字信号。 处理器将（908）基带数字信号加到延迟的基带数字信号上，从而产生一个相加的信号; 并将（910）加和的信号除以二，从而产生阈值信号。 处理器还将基带数字信号延迟（912）码元持续时间的一半，从而产生半延迟信号; 并从半延迟信号中减去（914）阈值信号，从而生成候选信号。 此外，处理器在候选信号中搜索（916）零交叉，并且响应于找到过零点而产生（918）脉冲。
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3.发明授权Method and apparatus in a wireless communication system for adding a second channel that overlaps a guard band used by a first channel 失效一种无线通信系统中的用于添加与第一信道所使用的保护带重叠的第二信道的方法和装置
公开(公告)号：US6154500A
公开(公告)日：2000-11-28
申请号：US83250
申请日：1998-05-20
CPC分类号： H04L27/2657 , H04L27/10 , H04L27/2602 , H04L27/2626 , H04L27/34 , H04B17/21 , H04L27/2675
摘要： In a wireless communication system a first transmission (612, 614) is sent (802) over a first channel to a first receiver (122) that requires a transmission-free guard band (620) during a tuning period, and the first receiver accommodates a second transmission (616) sent concurrently with the first transmission on a second channel that overlaps with spectrum occupied by the guard band. During the tuning period, the system disallows the second transmission, and the first receiver adjusts (804) a pass band of a radio frequency (RF) filter (302) therein such that the pass band includes the guard band. Thereafter, the first receiver tunes (806) to the first channel. During a time other than the tuning period, the first receiver readjusts (810) the pass band of the RF filter such that the pass band excludes the guard band. After the tuning period, the system allows the second transmission to be sent (812).
摘要翻译： 在无线通信系统中，通过第一信道将第一传输（612,614）发送（802）到在调谐周期期间需要无传输保护频带（620）的第一接收机（122），并且第一接收机容纳 在与由所述保护频带占据的频谱重叠的第二信道上与所述第一传输同时发送的第二传输（616）。 在调谐期间，系统禁止第二次发送，第一个接收机在其中调整（804）射频（RF）滤波器（302）的通带，使得通带包括保护带。 此后，第一接收机调谐（806）到第一信道。 在除了调谐周期之外的时间内，第一接收机重新调整（810）RF滤波器的通带，使得通带不包括保护频带。 在调谐周期之后，系统允许发送第二传输（812）。
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4.发明授权Method and apparatus for estimating time-of-arrival of a synchronization signal sent simultaneously from at least two non-collocated transmitters 有权用于估计从至少两个非并置发射机同时发送的同步信号的到达时间的方法和装置公开(公告)号：US06317474B1
公开(公告)日：2001-11-13
申请号：US09130174
申请日：1998-08-06
IPC分类号： H04L700
CPC分类号： H04H20/67 , H04J3/0682
摘要： At least two non-collocated transmitters (116) transmit (1604) a synchronization signal such that it includes at least three predetermined tone frequencies. A receiver (122) receives (1606) the synchronization signal, and separates (1608) the synchronization signal into a plurality of segments (404). The receiver then calculates (1610) segment Fourier transform values corresponding to the at least three predetermined tone frequencies, for ones of the plurality of segments, thereby creating a set of segment Fourier transform values. The receiver also computes a set of segment time-of-arrival (TOA) values corresponding to the set of segment Fourier transform values. In addition, the receiver determines (1612) a set of segment weights from the set of segment Fourier transform values, and estimates (1616) the TOA of the synchronization signal from the set of segment TOA values and the set of segment weights.
摘要翻译： 至少两个非并置的发射机（116）发送（1604）同步信号，使得它包括至少三个预定的音调频率。 接收机（122）接收（1606）同步信号，并将同步信号（1608）分离成多个段（404）。 然后，接收机计算对应于多个段中的至少三个预定音调频率的（1610）段傅里叶变换值，从而创建一组段傅里叶变换值。 接收机还计算一组对应于段傅里叶变换值集合的段到达时间（TOA）值。 另外，接收机根据分段傅里叶变换值组确定（1612）一组分段权重，并根据分段TOA值集合和分段权重集来估计（1616）同步信号的TOA。
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5.发明授权Method and apparatus in a communication receiver for compensating for channel amplitude and phase distortion 失效通信接收机中用于补偿信道幅度和相位失真的方法和装置
公开(公告)号：US5974100A
公开(公告)日：1999-10-26
申请号：US978552
申请日：1997-11-26
CPC分类号： H04L27/3809 , H04L2027/0028 , H04L2027/0046 , H04L2027/0087
摘要： A radio signal is digitized and filtered to derive a digitized pilot signal (210) modulated by channel amplitude and phase distortion. A numerator and a denominator are formed for dividing the digitized radio signal (208) by the digitized pilot signal, the numerator and the denominator requiring a first predetermined number of bits per sample. The bits of the numerator and the denominator are shifted (518) by equal amounts until a highest order bit of one of the numerator and the denominator is non-zero. A second predetermined number of highest order bits of the numerator are divided (524) by the second predetermined number of highest order bits of the denominator in a divider utilizing less than the first predetermined number of bits, to generate a channel compensated radio signal (536) having a minimum number of bits that can accommodate a predetermined maximum dynamic range.
摘要翻译： 无线电信号被数字化并被滤波以导出由信道幅度和相位失真调制的数字化导频信号（210）。 形成分子和分母，用于将数字化无线电信号（208）除以数字化导频信号，分子和分母需要每个样本的第一预定位数。 分子和分母的位被移位（518）相等的量，直到分子和分母之一的最高阶位不为零。 在小于第一预定数量的比特的分频器中，分母（524）除以分母的第二预定数量的最高位的第二预定数量的最高位，以产生信道补偿无线电信号（536 ）具有可以适应预定最大动态范围的最小位数。
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公开(公告)号：US5796787A
公开(公告)日：1998-08-18
申请号：US859809
申请日：1997-05-19
IPC分类号： H04L1/16 , H04L7/027 , H04L7/04 , H04L27/00 , H04L27/148 , H04L27/233 , H04L27/38 , H04L27/14
CPC分类号： H04L27/2332 , H04L27/148 , H04L27/3854 , H04L7/027 , H04L7/042 , H04L7/046 , H04L1/16 , H04L2027/003 , H04L2027/0046 , H04L2027/0093
摘要： A receiver (109) and a method therein arranged and constructed to receive a signal using a noncoherent matched filter structure including a frequency detector (205) arranged to process a first portion (602) of the signal to provide a frequency error; a timing detector (206), responsive to the frequency error, arranged to process a second portion (604) of the signal to provide a timing error; and a symbol detector (209), responsive to the frequency error and the timing error, arranged to process a symbol portion (606) of the signal to provide a detected symbol.
摘要翻译： 一种接收机（109）及其方法，其中布置和构造为使用非相干匹配滤波器结构接收信号，所述非相干匹配滤波器结构包括频率检测器（205），所述频率检测器被布置为处理所述信号的第一部分（602）以提供频率误差; 定时检测器（206），响应于所述频率误差，被布置为处理所述信号的第二部分（604）以提供定时误差; 以及响应于所述频率误差和定时误差的符号检测器（209），被布置为处理所述信号的符号部分（606）以提供检测到的符号。
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7.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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8.发明授权Method and apparatus in a wireless receiver for demodulating a continuous-phase frequency-shift-keyed signal 有权用于解调连续相位频移键控信号的无线接收机中的方法和装置公开(公告)号：US06625233B1
公开(公告)日：2003-09-23
申请号：US09408398
申请日：1999-09-29
IPC分类号： H04L2714
CPC分类号： H04L27/14
摘要： A demodulator (604) demodulates (802) a block of symbols of a signal through a single-symbol matched-filter technique, thereby generating a first set of data; and demodulates (804) the block of symbols through a multi-symbol matched-filter technique, thereby generating a second set of data. The demodulator obtains (806-810) a measurement of a characteristic of the signal, and chooses (814-816) one of the first and second sets of data for output, based upon the measurement.
摘要翻译： 解调器（604）通过单符号匹配滤波器技术解调（802）信号块的符号，从而产生第一组数据; 并且通过多符号匹配滤波器技术对（804）符号块进行解调，从而生成第二组数据。 解调器获得（806-810）信号特性的测量值，并根据测量结果选择（814-816）第一和第二组数据之一进行输出。
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9.发明授权Method and apparatus for facilitating reception of a signal on one of a plurality of contiguous channels 有权用于便于在多个相邻信道之一上接收信号的方法和装置公开(公告)号：US06370211B1
公开(公告)日：2002-04-09
申请号：US09245636
申请日：1999-02-05
IPC分类号： H04L2508
CPC分类号： H04L5/06 , H04B1/1027
摘要： In a zero intermediate frequency (ZIF) receiver (300) a desired signal is detected (902) and downmixed (924) to baseband, off-centered by an amount determined by at least one of (a) whether (906) pilot symbols are present in the desired signal, and (b) signal levels (908) of the desired signal and adjacent channel signals.
摘要翻译： 在零中频（ZIF）接收机（300）中，期望的信号被检测（902）并且下混合（924）到基带，偏离由（a）是否（906）导频符号的至少一个确定的量 存在于期望信号中，以及（b）期望信号和相邻信道信号的信号电平（908）。
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10.发明授权Method and apparatus for facilitating symbol timing acquisition in a data communication receiver 失效用于促进数据通信接收机中的符号定时获取的方法和装置
公开(公告)号：US5872819A
公开(公告)日：1999-02-16
申请号：US803049
申请日：1997-02-19
CPC分类号： H04L7/0334
摘要： A method and apparatus samples (902) a currently received symbol to form sampled values corresponding to sampling times, and evaluates (904) the currently received symbol to determine (906) its value. The method and apparatus recalls (908) a last previously received symbol and selects (916), from a plurality of thresholds (302), a threshold based upon the currently received symbol and the last previously received symbol. The threshold is known to be crossed consistently midway in time between the centers of two adjacent nominal symbols determined by the currently received symbol and the last previously received symbol. The sampled values are compared (920) to locate two adjacent samples, one having a first sampled value greater than the threshold and one having a second sampled value less than or equal to the threshold. A timing phase error is then computed (922, 924) from the first and second sampled values.
摘要翻译： 一种方法和装置对当前接收到的符号进行采样（902）以形成对应于采样时间的采样值，并评估（904）当前接收的符号以确定（906）其值。 方法和装置回忆（908）最后一个先前接收到的符号，并且从多个阈值（302）中选择（916）基于当前接收到的符号和最后一个先前接收到的符号的阈值。 已知阈值在由当前接收的符号和最后的先前接收到的符号确定的两个相邻标称符号的中心之间的时间中间交叉。 采样值被比较（920）以定位两个相邻样本，一个具有大于阈值的第一采样值，另一个具有小于或等于该阈值的第二采样值。 然后从第一和第二采样值计算定时相位误差（922,924）。
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