公开(公告)号：US20080140747A1

公开(公告)日：2008-06-12

申请号：US11862055

申请日：2007-09-26

Applicant: Young-Ha LEE ,  Youn-Ok PARK

Inventor： Young-Ha LEE ,  Youn-Ok PARK

IPC: G06F17/14

CPC classification number: G06F17/142

Abstract: The present invention relates to a complex multiplier and a twiddle factor generator. The complex multiplier according to an embodiment of the invention includes: a first adder/subtracter that adds the real part of the complex number and a first twiddle factor or subtracts the first twiddle factor from the real part of the complex number according to a first signal; a second adder/subtracter that adds the imaginary part of the complex number and a second twiddle factor or subtracts the second twiddle factor from the imaginary part of the complex number according to a second signal; a first multiplier that multiplies the value obtained by the first adder/subtracter by a third twiddle factor and outputs the resulting value; a second multiplier that multiplies the value obtained by the second adder/subtracter by a fourth twiddle factor and outputs the resulting value; a multiplexer that selectively outputs the values output from the first and second multipliers as a real part output signal and an imaginary part output signal according to a third signal; and a controller that provides the first to third signals. According to the present invention, it is possible to achieve a complex multiplier having a simple hardware design.

Abstract translation: 本发明涉及复数乘法器和旋转因子发生器。 根据本发明的实施例的复数乘法器包括：第一加法器/减法器，其将复数的实部和第一旋转因子相加，或者根据第一信号从复数的实部中减去第一旋转因子 ; 第二加法器/减法器，其将复数的虚部和第二旋转因子相加，或者根据第二信号从复数的虚部中减去第二旋转因子; 第一乘法器，将由第一加法器/减法器获得的值乘以第三旋转因数，并输出所得到的值; 第二乘法器，将由第二加法器/减法器获得的值乘以第四旋转因子，并输出所得到的值; 多路复用器，根据第三信号有选择地输出从第一和第二乘法器输出的值作为实部输出信号和虚部输出信号; 以及提供第一至第三信号的控制器。 根据本发明，可以实现具有简单的硬件设计的复数乘法器。

公开(公告)号：US20110149718A1

公开(公告)日：2011-06-23

申请号：US12841493

申请日：2010-07-22

Applicant: Young-Ha LEE

Inventor： Young-Ha LEE

IPC: H04J11/00

CPC classification number: H04L27/265 ,  G06F17/142 ,  H04L27/263

Abstract: A fast Fourier transform (FFT) apparatus and method. The FFT method may include finding a number of subcarriers carrying valid data in reception data, determining a Fourier transform order on the basis of the number of subcarriers, performing complex multiplication on the reception data, and then performing a Fourier transform of the determined Fourier transform order. Using the FFT method, it is possible to reduce the amount of computation and the complexity of an FFT in a frequency division multiplexing (FDM) system and simplify a hardware structure.

Abstract translation: 一种快速傅立叶变换（FFT）装置和方法。 FFT方法可以包括：在接收数据中发现携带有效数据的子载波数量，基于子载波数量确定傅里叶变换顺序，对接收数据执行复数乘法，然后执行所确定的傅里叶变换 订购。 使用FFT方法，可以减少频分复用（FDM）系统中的计算量和复杂度，并简化硬件结构。

公开(公告)号：US20090060069A1

公开(公告)日：2009-03-05

申请号：US12105172

申请日：2008-04-17

Applicant: Jun-Woo KIM ,  Dae-Ho KIM ,  Young-Ha LEE ,  Youn-Ok PARK

Inventor： Jun-Woo KIM ,  Dae-Ho KIM ,  Young-Ha LEE ,  Youn-Ok PARK

IPC: H04L27/28

CPC classification number: H04L27/2607 ,  H04L27/263

Abstract: The present invention relates to a signal transmitting apparatus, a method thereof, and an inverse fast Fourier transform (IFFT) apparatus for a signal transmitting apparatus. A signal transmitting apparatus according to an embodiment of the present invention receives data, and performs inverse fast Fourier transform (IFFT) on the data on the basis of a twiddle factor for shifting output data by the size of a cyclic prefix. In addition, the signal transmitting apparatus sequentially stores data corresponding to the size of the cyclic prefix starting with initial data among the transformed data, and generates an OFDM symbol on the basis of the stored data and the transformed data. According to the embodiment of the present invention, it is possible to efficiently reduce a time delay and a memory use amount when a cyclic prefix is added at a transmitting end, without changing the size of hardware and power consumption.

Abstract translation: 信号发送装置及其方法技术领域本发明涉及信号发送装置及其方法以及信号发送装置的快速傅里叶逆变换（IFFT）装置。 根据本发明的实施例的信号发送装置接收数据，并且基于用于根据循环前缀的大小移位输出数据的旋转因子对数据进行快速傅立叶逆变换（IFFT）。 此外，信号发送装置顺序地存储与变换数据中的初始数据开始的循环前缀的大小相对应的数据，并且根据存储的数据和变换后的数据生成OFDM符号。 根据本发明的实施例，可以有效地减少在发送端添加循环前缀的时间延迟和存储器使用量，而不改变硬件和功耗的大小。