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1.发明授权公开(公告)号：US08089990B2
公开(公告)日：2012-01-03
申请号：US12233084
申请日：2008-09-18
IPC分类号： H04J3/06
CPC分类号： H04L27/2662 , H04L5/0007 , H04L5/0048 , H04L27/2656 , H04L27/2675 , H04L27/2695
摘要： Disclosed are an apparatus and a method for preventing data read error for OFDM symbol demodulation. An average time synchronization offset estimating unit estimates average time synchronization offset between a pilot symbol of a time synchronized data frame and pilot symbols of data frames next to the time synchronized data frame. A data buffer control unit acquires a start location of a data frame to be read using the estimated average time synchronization offset, and controls reading of written data frames using the acquired start location information of the data frame to be read. In the apparatus and the method, a data buffering using a ring buffer construction may compensate time synchronization offset of samples containing real data in an OFDM symbol and prevent an erroneous read error in order to improve a receiving performance of a receiver.
摘要翻译： 公开了一种用于防止OFDM符号解调的数据读取错误的装置和方法。 平均时间同步偏移估计单元估计时间同步数据帧的导频符号与时间同步数据帧之后的数据帧的导频符号之间的平均时间同步偏移。 数据缓冲器控制单元使用估计的平均时间同步偏移来获取要读取的数据帧的开始位置，并且使用获取的要读取的数据帧的开始位置信息来控制写入的数据帧的读取。 在装置和方法中，使用环形缓冲器构造的数据缓冲可以补偿在OFDM符号中包含实际数据的样本的时间同步偏移，并且防止错误的读取错误，以便提高接收机的接收性能。
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2.发明申请APPARATUS FOR SYNCHRONIZING OFDM SIGNAL USING OPEN-LOOP FREQUENCY SYNCHRONIZATION METHOD AND FREQUENCY OFFSET ESTIMATION SCHEME USING THE APPARATUS 有权用于使用开环频率同步方法同步OFDM信号的装置和使用装置的频率偏移估计方案公开(公告)号：US20100118990A1
公开(公告)日：2010-05-13
申请号：US12338263
申请日：2008-12-18
IPC分类号： H04L27/28
CPC分类号： H04L27/2662 , H04L27/2656 , H04L27/2659 , H04L27/266 , H04L27/2675
摘要： There are provided an apparatus for synchronizing an OFDM signal using an open-loop frequency synchronization method, which can estimate and compensate for various types of frequency errors generated in a frequency modulation broadcasting/communication system to which the open-loop frequency synchronization method is applied, and a frequency offset estimation scheme using the apparatus. To this end, the apparatus for synchronizing an OFDM signal using the open-loop frequency synchronization method comprises a time offset estimator, a time offset compensator, a fractional frequency offset estimator, an integer frequency offset estimator, a frequency offset controller and a frequency offset compensator. Accordingly, in the OFDM demodulation broadcasting/communication system using the open-loop frequency synchronization method, a frequency offset, which is generated due to the carrier frequency difference between a transmitter and a receiver, a frequency shift generated due to the mobile environment of a receiver, the temperature characteristic of a local oscillator, and the like, can be estimated and compensated.
摘要翻译： 提供了一种使用开环频率同步方法同步OFDM信号的装置，其可以估计和补偿在应用开环频率同步方法的频率调制广播/通信系统中产生的各种类型的频率误差 以及使用该装置的频率偏移估计方案。 为此，使用开环频率同步方法同步OFDM信号的装置包括时间偏移估计器，时间偏移补偿器，分数频率偏移估计器，整数频率偏移估计器，频率偏移控制器和频率偏移 补偿器 因此，在使用开环频率同步方式的OFDM解调广播/通信系统中，由于发送机与接收机之间的载波频率差异而产生的频率偏移是由于移动环境中产生的频移 接收机，本地振荡器的温度特性等可以被估计和补偿。
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3.发明申请APPARATUS AND METHOD FOR PREVENTING DATA READ ERROR FOR ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYMBOL DEMODULATION 失效装置和方法，用于预防数据读取错误的正交频分多重符号解调公开(公告)号：US20090303867A1
公开(公告)日：2009-12-10
申请号：US12233084
申请日：2008-09-18
CPC分类号： H04L27/2662 , H04L5/0007 , H04L5/0048 , H04L27/2656 , H04L27/2675 , H04L27/2695
摘要： Disclosed are an apparatus and a method for preventing data read error for OFDM symbol demodulation. An average time synchronization offset estimating unit estimates average time synchronization offset between a pilot symbol of a time synchronized data frame and pilot symbols of data frames next to the time synchronized data frame. A data buffer control unit acquires a start location of a data frame to be read using the estimated average time synchronization offset, and controls reading of written data frames using the acquired start location information of the data frame to be read. In the apparatus and the method, a data buffering using a ring buffer construction may compensate time synchronization offset of samples containing real data in an OFDM symbol and prevent an erroneous read error in order to improve a receiving performance of a receiver.
摘要翻译： 公开了一种用于防止OFDM符号解调的数据读取错误的装置和方法。 平均时间同步偏移估计单元估计时间同步数据帧的导频符号与时间同步数据帧之后的数据帧的导频符号之间的平均时间同步偏移。 数据缓冲器控制单元使用估计的平均时间同步偏移来获取要读取的数据帧的开始位置，并且使用获取的要读取的数据帧的开始位置信息来控制写入的数据帧的读取。 在装置和方法中，使用环形缓冲器构造的数据缓冲可以补偿在OFDM符号中包含实际数据的样本的时间同步偏移，并且防止错误的读取错误，以便提高接收机的接收性能。
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4.发明申请公开(公告)号：US20100150181A1
公开(公告)日：2010-06-17
申请号：US12337279
申请日：2008-12-17
CPC分类号： H04L27/2647 , H04L27/2656 , H04L27/2657 , H04L27/2662
摘要： There is provided an apparatus for receiving a T-DMB signal. The apparatus for receiving a T-DMB signal comprises an input buffer receiving and buffering a T-DMB signal comprising a null symbol and a phase reference symbol (PRS); an initial synchronizing unit estimating and compensating for time and frequency offsets of the T-DMB signal using the null symbol and the PRS; a frame tracking unit performing estimation of the time offset and measurement of a strength of an output signal from the input buffer; an OFDM signal demodulating unit performing I/Q demodulation, frequency compensation, OFDM demodulation and de-interleaving with respect to an output signal of the frame tracking unit; a channel decoding unit performing channel decoding with respect to an output signal of the OFDM signal demodulating unit and checking quality of the channel-decoded signal; and a controller controlling operations of the initial synchronizing unit, the OFDM signal demodulating unit and the channel decoding unit 308 based on the strength of the signal measured by the frame tracking unit and the quality of the signal checked by the channel decoding unit. Accordingly, unnecessary calculating processes arc reduced by measuring the strength and quality of an input signal, thereby maximizing power efficiency of the apparatus.
摘要翻译： 提供了一种用于接收T-DMB信号的装置。 用于接收T-DMB信号的装置包括输入缓冲器，其接收和缓冲包括零符号和相位参考符号（PRS）的T-DMB信号; 初始同步单元使用空符号和PRS估计和补偿T-DMB信号的时间和频率偏移; 帧跟踪单元执行时间偏移的估计和来自输入缓冲器的输出信号的强度的测量; OFDM信号解调单元，相对于帧跟踪单元的输出信号执行I / Q解调，频率补偿，OFDM解调和解交织; 信道解码单元，对OFDM信号解调单元的输出信号进行信道解码，检查信道解码信号的质量; 以及控制器，其基于由帧跟踪单元测量的信号的强度和由信道解码单元检查的信号的质量来控制初始同步单元，OFDM信号解调单元和信道解码单元308的操作。 因此，通过测量输入信号的强度和质量来减少不必要的计算处理，从而使设备的功率效率最大化。
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5.发明授权Apparatus for synchronizing OFDM signal using open-loop frequency synchronization method and frequency offset estimation scheme using the apparatus 有权使用该设备使用开环频率同步方法和频率偏移估计方案来同步OFDM信号的设备公开(公告)号：US08160185B2
公开(公告)日：2012-04-17
申请号：US12338263
申请日：2008-12-18
IPC分类号： H04L27/06
CPC分类号： H04L27/2662 , H04L27/2656 , H04L27/2659 , H04L27/266 , H04L27/2675
摘要： There are provided an apparatus for synchronizing an OFDM signal using an open-loop frequency synchronization method, which can estimate and compensate for various types of frequency errors generated in a frequency modulation broadcasting/communication system to which the open-loop frequency synchronization method is applied, and a frequency offset estimation scheme using the apparatus. To this end, the apparatus for synchronizing an OFDM signal using the open-loop frequency synchronization method comprises a time offset estimator, a time offset compensator, a fractional frequency offset estimator, an integer frequency offset estimator, a frequency offset controller and a frequency offset compensator. Accordingly, in the OFDM demodulation broadcasting/communication system using the open-loop frequency synchronization method, a frequency offset, which is generated due to the carrier frequency difference between a transmitter and a receiver, a frequency shift generated due to the mobile environment of a receiver, the temperature characteristic of a local oscillator, and the like, can be estimated and compensated.
摘要翻译： 提供了一种使用开环频率同步方法同步OFDM信号的装置，其可以估计和补偿在应用开环频率同步方法的频率调制广播/通信系统中产生的各种类型的频率误差 以及使用该装置的频率偏移估计方案。 为此，使用开环频率同步方法同步OFDM信号的装置包括时间偏移估计器，时间偏移补偿器，分数频率偏移估计器，整数频率偏移估计器，频率偏移控制器和频率偏移 补偿器 因此，在使用开环频率同步方式的OFDM解调广播/通信系统中，由于发送机与接收机之间的载波频率差异而产生的频率偏移是由于移动环境中产生的频移 接收机，本地振荡器的温度特性等可以被估计和补偿。
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6.发明授权公开(公告)号：US08040964B2
公开(公告)日：2011-10-18
申请号：US12337279
申请日：2008-12-17
IPC分类号： H04K1/10
CPC分类号： H04L27/2647 , H04L27/2656 , H04L27/2657 , H04L27/2662
摘要： There is provided an apparatus for receiving a T-DMB signal. The apparatus for receiving a T-DMB signal comprises an input buffer receiving and buffering a T-DMB signal comprising a null symbol and a phase reference symbol (PRS); an initial synchronizing unit estimating and compensating for time and frequency offsets of the T-DMB signal using the null symbol and the PRS; a frame tracking unit performing estimation of the time offset and measurement of a strength of an output signal from the input buffer; an OFDM signal demodulating unit performing I/Q demodulation, frequency compensation, OFDM demodulation and de-interleaving with respect to an output signal of the frame tracking unit; a channel decoding unit performing channel decoding with respect to an output signal of the OFDM signal demodulating unit and checking quality of the channel-decoded signal; and a controller controlling operations of the initial synchronizing unit, the OFDM signal demodulating unit and the channel decoding unit 308 based on the strength of the signal measured by the frame tracking unit and the quality of the signal checked by the channel decoding unit. Accordingly, unnecessary calculating processes arc reduced by measuring the strength and quality of an input signal, thereby maximizing power efficiency of the apparatus.
摘要翻译： 提供了一种用于接收T-DMB信号的装置。 用于接收T-DMB信号的装置包括输入缓冲器，其接收和缓冲包括零符号和相位参考符号（PRS）的T-DMB信号; 初始同步单元使用空符号和PRS估计和补偿T-DMB信号的时间和频率偏移; 帧跟踪单元执行时间偏移的估计和来自输入缓冲器的输出信号的强度的测量; OFDM信号解调单元，相对于帧跟踪单元的输出信号执行I / Q解调，频率补偿，OFDM解调和解交织; 信道解码单元，对OFDM信号解调单元的输出信号进行信道解码，检查信道解码信号的质量; 以及控制器，其基于由帧跟踪单元测量的信号的强度和由信道解码单元检查的信号的质量来控制初始同步单元，OFDM信号解调单元和信道解码单元308的操作。 因此，通过测量输入信号的强度和质量来减少不必要的计算处理，从而使设备的功率效率最大化。
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