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    METHOD AND APPARATUS FOR MODULATING SYMBOLS IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM AND TRANSMISSION APPARATUS USING THE SAME
    1.
    发明申请
    METHOD AND APPARATUS FOR MODULATING SYMBOLS IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM AND TRANSMISSION APPARATUS USING THE SAME 有权
    用于调制正交频分复用系统中的符号的方法和装置及其传输装置

    公开(公告)号：US20080165676A1

    公开(公告)日：2008-07-10

    申请号：US11966249

    申请日：2007-12-28

    申请人： Jun-Kyu KANG ,  Young-Ik Cho ,  Hun-Kee Kim

    发明人： Jun-Kyu KANG ,  Young-Ik Cho ,  Hun-Kee Kim

    IPC分类号： H04J11/00

    CPC分类号： H04L27/2607 ,  H04L5/0007 ,  H04L27/263

    摘要： A method for modulating a symbol in a transmitter of an Orthogonal Frequency Division Multiplexing (OFDM) system. The symbol modulation method includes multiplying an input stream of an Inverse Fast Fourier Transform (IFFT) unit by a Twiddling factor for circular-shifting the input stream of the IFFT unit by a Cyclic Prefix (CP) length; performing IFFT on the input stream of the IFFT unit, which is multiplied by the Twiddling factor; buffering data corresponding to the CP length beginning from a front of an output stream of the IFFT unit; and generating an OFDM symbol by forward-copying the buffered data to a back of the output stream of the IFFT unit.

    摘要翻译： 一种用于调制正交频分复用（OFDM）系统的发射机中的符号的方法。 符号调制方法包括将快速傅里叶逆变换（IFFT）单位的输入流乘以Twiddling因子，以便将IFFT单元的输入流循环移位循环前缀（CP）长度; 对IFFT单元的输入流执行IFFT，乘以Twiddling因子; 从IFFT单元的输出流的前面开始缓冲对应于CP长度的数据; 以及通过将所缓冲的数据转发到所述IFFT单元的输出流的背面来产生OFDM符号。

    METHOD AND APPARATUS FOR REDUCING DIGITAL TO ANALOG CONVERSION (DAC) BITS IN FREQUENCY DIVISION MULTIPLE ACCESS (FDMA) SYSTEM
    2.
    发明申请
    METHOD AND APPARATUS FOR REDUCING DIGITAL TO ANALOG CONVERSION (DAC) BITS IN FREQUENCY DIVISION MULTIPLE ACCESS (FDMA) SYSTEM 失效
    用于减少频分多址（FDMA）系统中数字到模拟转换（DAC）位的方法和装置

    公开(公告)号：US20090154442A1

    公开(公告)日：2009-06-18

    申请号：US12337702

    申请日：2008-12-18

    申请人： Jun-Kyu KANG ,  In-Tae Kang ,  Jeong-Gil Lee ,  Bo-Rham Lee ,  Sang-Min Bae

    发明人： Jun-Kyu KANG ,  In-Tae Kang ,  Jeong-Gil Lee ,  Bo-Rham Lee ,  Sang-Min Bae

    IPC分类号： H04B7/208

    CPC分类号： H04L27/2614 ,  H03M1/662 ,  H03M1/70 ,  H04L5/0044 ,  H04L27/2626

    摘要： A method and an apparatus for reducing Digital-to-Analog Conversion (DAC) bits at a transmitter of a Frequency Division Multiple Access (FDMA) system reduces a number of the bits for conversion so as to save power and reduce the cost of operation. The method can include generating a digital signal gain control value and an analog signal gain control value using subcarrier allocation information, a required Signal to Noise Ratio (SNR), and a Peak to Average Power Ratio (PAPR); controlling a gain of a signal input to a digital-to-analog converter using the digital signal gain control value; converting a digital signal of the controlled gain to an analog signal using the digital-to-analog converter; and restoring an original signal by controlling a gain of a signal output from the digital-to-analog converter using the analog signal gain control value.

    摘要翻译： 用于减少频分多址（FDMA）系统的发射机处的数模转换（DAC）比特的方法和装置减少了用于转换的比特数，以节省功率并降低操作成本。 该方法可以包括使用子载波分配信息，所需的信噪比（SNR）和峰均功率比（PAPR）来产生数字信号增益控制值和模拟信号增益控制值; 使用数字信号增益控制值控制输入到数模转换器的信号的增益; 使用数模转换器将受控增益的数字信号转换为模拟信号; 以及通过使用模拟信号增益控制值控制从数模转换器输出的信号的增益来恢复原始信号。