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公开(公告)号：US6028900A
公开(公告)日：2000-02-22
申请号：US861072
申请日：1997-05-21
CPC分类号： H04L27/2656 , H04L27/2659 , H04L27/266 , H04L27/2675 , H04L27/2679 , H04L1/0054
摘要： To control the oscillation frequency of a local oscillator, a digital broadcast receiver demodulates a phase-reference symbol contained in an orthogonal frequency-division multiplexed broadcast signal, modifies the resulting frequency-domain data by multiplication with complex conjugates of known data encoded in the phase-reference signal, under different assumed frequency offsets, converts the modified data to time-domain data, and thereby detects a first frequency error equal to a multiple of the subcarrier spacing and a second frequency error not exceeding the subcarrier spacing. Differential phase error is also detected. The oscillation frequency is adjusted to correct the first frequency error and differential phase error; then the second frequency error is used to correct for ambiguity in the differential phase error.
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公开(公告)号：US6148045A
公开(公告)日：2000-11-14
申请号：US395154
申请日：1999-09-14
CPC分类号： H04L27/2656 , H04L27/2659 , H04L27/266 , H04L27/2675 , H04L27/2679 , H04L1/0054
摘要： To control the oscillation frequency of a local oscillator, a digital broadcast receiver demodulates a phase-reference symbol contained in an orthogonal frequency-division multiplexed broadcast signal, modifies the resulting frequency-domain data by multiplication with complex conjugates of known data encoded in the phase-reference signal, under different assumed frequency offsets, converts the modified data to time-domain data, and thereby detects a first frequency error equal to a multiple of the subcarrier spacing and a second frequency error not exceeding the subcarrier spacing. Differential phase error is also detected. The oscillation frequency is adjusted to correct the first frequency error and differential phase error; then the second frequency error is used to correct for ambiguity in the differential phase error.
摘要翻译： 为了控制本地振荡器的振荡频率，数字广播接收机解调包含在正交频分多路复用广播信号中的相位参考符号，通过与在相位中编码的已知数据的复共轭进行乘法来修改所得到的频域数据 - 参考信号，在不同的假定频率偏移下，将修改的数据转换为时域数据，从而检测等于子载波间隔的倍数的第一频率误差和不超过子载波间隔的第二频率误差。 还检测到差分相位误差。 调整振荡频率以校正第一频率误差和差分相位误差; 则使用第二频率误差来校正差分相位误差中的歧义。
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3.发明授权Digital sound broadcasting receiver and automatic phase controlling method therefor 失效数字声音广播接收机及其自动相位控制方法
公开(公告)号：US5867503A
公开(公告)日：1999-02-02
申请号：US785506
申请日：1997-01-17
CPC分类号： H04L27/2657 , H03J7/04 , H04H40/18 , H04H60/11 , H04L1/0057 , H04L1/20 , H04L27/2679 , H04H2201/20
摘要： A digital sound broadcasting receiver and method receives a radio wave from a digital sound broadcasting station, demodulates the radio wave into baseband signals at a tuner, subjects the signals to demodulation, performs error detection and error correction at signal processors to obtain digital data, and inputs the digital data into an audio circuit to obtain audio or data output. A CRC error rate detector 13 for a fast information channel (FIC) for APC pseudo lock releasing action on demodulating the signals is arranged to determine, based on the possibility of an error rate of an error-detecting code (CRC) of the FIC, whether an APC pseudo lock state occurs, and to control releasing action for the APC pseudo lock state.
摘要翻译： 数字声音广播接收机和方法从数字声音广播台接收无线电波，在调谐器处将无线电波解调为基带信号，对信号进行解调，在信号处理器处执行错误检测和纠错以获得数字数据，以及 将数字数据输入音频电路以获得音频或数据输出。 布置了用于解调信号的用于APC伪锁释放动作的快速信息信道（FIC）的CRC错误率检测器13，基于FIC的错误检测码（CRC）的错误率的可能性， 是否发生APC伪锁定状态，并且控制APC伪锁定状态的释放动作。
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公开(公告)号：US6038275A
公开(公告)日：2000-03-14
申请号：US842789
申请日：1997-04-16
CPC分类号： H04L27/2662 , H04H40/18 , H04L27/2657 , H04L27/2675 , H04L27/2684 , H04H2201/20
摘要： A digital broadcasting receiver reduces the amount of operations in timing synchronization processing while reducing circuit scale and power consumption. Selective data extraction thins out and band-limits input data from demodulation data of phase reference symbols subjected to known modulation as synchronizing signal to reduce the number of data, so that the amount of required operations in phase correcting, IDFT and peak detecting can be reduced.
摘要翻译： 数字广播接收机减少定时同步处理中的操作量，同时减少电路规模和功耗。 选择性数据提取将经过已知调制的相位参考符号的解调数据的输入数据带宽限制为同步信号，以减少数据数，从而可以减少相位校正，IDFT和峰值检测所需的操作量 。
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公开(公告)号：US5959965A
公开(公告)日：1999-09-28
申请号：US840724
申请日：1997-04-25
CPC分类号： H04L27/2657 , H04L27/2679 , H04H2201/20
摘要： It is an object to correct a frequency deviation at the time of reception of a digital signal in which each carrier is subjected to phase modulation and orthogonal frequency division multiplexing (OFDM). A vector of fixed pattern symbols for reference of received carriers is multiplied by a vector of conjugate complex numbers of the defined values for each element. In the result, elements separated by the same numbers forward and backward from an element at a particular carrier frequency are multiplied together and the results are added. The same processing is applied to cases in which the elements of the vectors are mutually shifted by a plurality of elements from a certain correspondence and synchronization control to the broadcasting frequency is provided on the basis of a value which maximizes the absolute value in the results of the addition and the correspondence at that time.
摘要翻译： 本发明的目的是在接收对每个载波进行相位调制和正交频分复用（OFDM）的数字信号时，校正频率偏差。 用于参考接收载波的固定模式符号向量乘以每个元素的定义值的共轭复数的向量。 其结果是，将从特定载波频率的元素前后相同数字分离的元素相乘，并将结果相加。 根据使得将结果中的绝对值最大化的值来提供相同的处理，其中向量的元素被多个元素从特定对应和同步控制相互移位到广播频率的情况下 当时的补充和通信。
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6.发明授权Method and digital receiver for receiving orthogonal frequency-division multiplexed signals 失效用于接收正交频分复用信号的方法和数字接收机
公开(公告)号：US5946292A
公开(公告)日：1999-08-31
申请号：US906242
申请日：1997-08-04
CPC分类号： H04L27/2657 , H04L27/2659 , H04L27/2679
摘要： A digital receiver uses a local oscillator to down-convert an orthogonal frequency-division multiplexed signal that has been modulated by differential phase-shift keying, and performs further processing to obtain a differentially demodulated array of phase values. According to a first aspect of the invention, the digital receiver detects a carrier offset, applies a corresponding phase correction to the values in the array, then shifts the entire array by an amount corresponding to the carrier offset. As a result, the local oscillator need be tuned only in a frequency range equal to the subcarrier spacing. According to a second aspect of the invention, the local oscillator is tuned within a range equal to the subcarrier spacing multiplied by a certain integer, the array is shifted by a multiple of this integer, and the phase correction is eliminated.
摘要翻译： 数字接收机使用本地振荡器对已经通过差分相移键控调制的正交频分复用信号进行下变频，并执行进一步的处理以获得差分解调的相位值阵列。 根据本发明的第一方面，数字接收机检测载波偏移，对阵列中的值应用对应的相位校正，然后将整个阵列移位一个对应于载波偏移的量。 因此，本地振荡器仅需要在等于子载波间隔的频率范围内进行调谐。 根据本发明的第二方面，本地振荡器在等于乘以某一整数的子载波间隔的范围内被调谐，该阵列被移位该整数的倍数，并且消除了相位校正。
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公开(公告)号：US6151374A
公开(公告)日：2000-11-21
申请号：US810292
申请日：1997-03-03
CPC分类号： H04L27/2656 , H04H40/18 , H04L27/2675 , H04H2201/20
摘要： When an edge detecting unit detects a falling edge of a digital audio broadcasting (DAB) signal, a time instant of a timer, which has a periodic characteristic, is stored via a calculating unit into a memory. If there is one piece of data continued a number of times, when an output value of a timer becomes a value of this data offset by a frame time period, the calculating unit resets the timer. Subsequently, when the value of the timer becomes equal to the period length T, the calculating unit resets the timer and at the same time, outputs an L level to an output terminal only during a preselected time period after the timer is set to 0. Accordingly, even when another signal is mixed into a frame synchronizing signal of a DAB signal, the synchronizing signal timing is detected without increasing the time required to detect a frame header.
摘要翻译： 当边缘检测单元检测到数字音频广播（DAB）信号的下降沿时，具有周期特性的定时器的时刻经由计算单元被存储到存储器中。 如果有一段数据持续多次，当定时器的输出值变为该数据偏移帧时间段的值时，计算单元复位定时器。 随后，当定时器的值等于周期长度T时，计算单元复位定时器，并且同时仅在定时器设置为0之后的预选时间段期间才将L电平输出到输出端。 因此，即使当另一个信号被混合到DAB信号的帧同步信号中时，检测同步信号定时，而不增加检测帧报头所需的时间。
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公开(公告)号：US6021165A
公开(公告)日：2000-02-01
申请号：US796545
申请日：1997-02-06
CPC分类号： H04L27/2657 , H04L27/2675
摘要： To control the oscillation frequency of a local oscillator, a digital broadcast receiver demodulates a phase-reference symbol contained in an orthogonal frequency-division multiplexed broadcast signal. The resulting frequency-domain data are modified by multiplication with complex conjugates of the known data encoded in the phase-reference signal, under different assumed frequency offsets between the frequency-domain data and known data. The results are converted to time-domain data, yielding one time series for each assumed frequency offset. One value is taken from each time series, these values are compared, and the oscillation frequency is adjusted according to the comparison results.A digital broadcast receiver for receiving a PSK-OFDM signal, having a local oscillator with a controllable oscillation frequency, a mixer for down-converting said PSK-OFDM signal to an intermediate-frequency signal by mixing said PSK-OFDM signal with a signal generated by said local oscillator, and demodulating circuits for obtaining an array of frequency-domain data from said intermediate-frequency signal, said array of frequency-domain data representing subcarrier phase information of said PSK-OFDM signal. The digital broadcast receiver further including a phase modifying means, an inverse-fast-Fourier-transform means, a peak detecting means, and a frequency-deviation detector. The digital broadcast receiver can also include a data selecting means in addition to the elements previously described.
摘要翻译： 为了控制本地振荡器的振荡频率，数字广播接收机解调包含在正交频分复用广播信号中的相位参考符号。 在频域数据与已知数据之间的不同假设频率偏移下，通过与在相位参考信号中编码的已知数据的复共轭相乘来修正所得到的频域数据。 将结果转换为时域数据，为每个假定的频率偏移产生一个时间序列。 从每个时间序列取一个值，比较这些值，并根据比较结果调整振荡频率。 一种用于接收具有可控振荡频率的本地振荡器的PSK-OFDM信号的数字广播接收机，用于通过将所述PSK-OFDM信号与产生的信号混合来将所述PSK-OFDM信号下变频为中频信号的混合器 通过所述本地振荡器和解调电路，用于从所述中频信号获得频域数据阵列，所述频域数据阵列表示所述PSK-OFDM信号的子载波相位信息。 数字广播接收机还包括相位修改装置，反快速傅里叶变换装置，峰值检测装置和频率偏差检测器。 数字广播接收机还可以包括除上述元素之外的数据选择装置。
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公开(公告)号：US06341123B1
公开(公告)日：2002-01-22
申请号：US09015768
申请日：1998-01-29
IPC分类号： H04L2706
CPC分类号： H04L27/2657 , H04H40/18 , H04H2201/20 , H04L27/2679
摘要： A digital audio broadcasting receiver comprises a phase error detector for detecting a phase error from data from a differential demodulator, an average value processing unit for determining the average value of phase errors, a memory for storing the phase errors of the carriers outputted from the phase error detector, and a phase error correcting unit which excludes a phase error whose sign is opposite to that of the average value among the phase errors stored in the memory, and determined the average value of phase errors again, thereby making it possible to obtain a phase error signal which is less affected by leakage from other carriers.
摘要翻译： 数字音频广播接收机包括：相位误差检测器，用于从差分解调器的数据中检测相位误差;平均值处理单元，用于确定相位误差的平均值;存储器，用于存储从相位输出的载波的相位误差 误差检测器和相位误差校正单元，其排除与存储在存储器中的相位误差中的平均值相反的相位误差，并且再次确定相位误差的平均值，从而可以获得 相位误差信号受到其他载波泄漏的影响较小。
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公开(公告)号：US6151369A
公开(公告)日：2000-11-21
申请号：US44862
申请日：1998-03-20
IPC分类号： H04L27/18 , H03J7/04 , H04B1/16 , H04B1/30 , H04H20/00 , H04H40/18 , H04J11/00 , H04L27/26 , H04L27/22
CPC分类号： H04H40/18 , H03J7/04 , H04B1/30 , H04L27/2657 , H04L27/2675
摘要： To control the oscillation frequency of a local oscillator, a digital broadcast receiver demodulates a phase-reference symbol contained in an orthogonal frequency-division multiplexed broadcast signal to obtain an array of complex values, selects several sets of values from the array, multiplies each selected value by the complex conjugate of a value offset by N positions in the array (where N is a fixed integer that may be equal to zero), averages the results in each set, takes differences between the average values, or between sums of these average values, thereby obtains two difference values, and calculates a frequency offset from the difference values. Each set of values is taken from positions at which the known reference-symbol values satisfy certain conditions in relation to the known values at adjacent positions.
摘要翻译： 为了控制本地振荡器的振荡频率，数字广播接收机解调包含在正交频分复用广播信号中的相位参考符号以获得复数值阵列，从阵列中选择若干组值， 值由数组偏移N个位置的值的复共轭（其中N是可以等于零的固定整数），对每个集合中的结果进行平均，取平均值之间或这些平均值之和 值，从而获得两个差值，并且从差值计算频率偏移。 每组值取自已知参考符号值相对于相邻位置处的已知值满足某些条件的位置。
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