-
1.发明授权System and method for communicating data using efficient fast fourier transform (FFT) for orthogonal frequency division multiplexing (OFDM) 有权用于正交频分复用（OFDM）的高效快速傅里叶变换（FFT）传送数据的系统和方法公开(公告)号：US08274921B2
公开(公告)日：2012-09-25
申请号：US12060292
申请日：2008-04-01
IPC分类号： H04K1/10
CPC分类号： H04L27/2628 , G06F17/142 , H04L27/265
摘要： A system communicates data and includes a transmitter for transmitting a communications signal that carries communications data. It includes an efficient modulator for approximating the frequencies of sine/cosine basis waveforms using complex exponential functions and adding and subtracting the complex exponential functions to generate an Orthogonal Frequency Division Multiplexed (OFDM) communications signal as a plurality of N data subcarriers that carry communications data as data symbols. A receiver receives the OFDM communications signal and includes a demodulation circuit for demodulating the OFDM communications signal using logical shifts of multiples +/−2p based on complex exponential functions corresponding to sine/cosine basis waveform approximations to extract amplitude and phase values from a plurality of N data subcarriers as data symbols within the OFDM communications signal.
摘要翻译： 系统通信数据并包括用于发送携带通信数据的通信信号的发射机。 它包括一个有效的调制器，用于使用复指数函数近似正弦/余弦基波形的频率，并且加上和减去复指数函数以产生正交频分复用（OFDM）通信信号作为携带通信数据的多个N个数据子载波 作为数据符号。 接收机接收OFDM通信信号，并且包括解调电路，用于使用基于与正弦/余弦基波形近似对应的复指数函数的倍数+/- 2p的逻辑移位来解调OFDM通信信号，以从多个 N个数据副载波作为OFDM通信信号内的数据符号。
-
2.发明授权System and method for communicating data using efficient fast fourier transform (FFT) for orthogonal frequency division multiplexing (OFDM) modulation 有权用于使用用于正交频分复用（OFDM）调制的有效快速傅立叶变换（FFT）来传送数据的系统和方法公开(公告)号：US08229009B2
公开(公告)日：2012-07-24
申请号：US12060283
申请日：2008-04-01
IPC分类号： H04K1/10
CPC分类号： H04L27/265 , G06F17/142 , H04L27/2628
摘要： A communications device includes at least one memory device for storing complex exponential functions as approximations of sine and cosine basis waveforms. A logic circuit adds and subtracts the complex exponential functions to generate an Orthogonal Frequency Division Multiplexed (OFDM) communications signal as a plurality of N data subcarriers that carry communications data. The logic circuit provides efficient and accurate implementation of the IFFT for use as an OFDM modulator using additions of stored complex exponentials and modulation of the integer-valued QAM data symbols using logic shifts and sign changes (2's complement).
摘要翻译： 通信设备包括至少一个用于存储复数指数函数作为正弦和余弦基波形近似的存储器件。 逻辑电路加上和减去复指数函数以产生正交频分复用（OFDM）通信信号作为携带通信数据的多个N个数据副载波。 逻辑电路提供了IFFT的有效和准确的实现，用于使用存储的复指数的加法和使用逻辑移位和符号变化（2的补码）对整数值QAM数据符号进行调制而用作OFDM调制器。
-
3.发明申请SYSTEM AND METHOD FOR COMMUNICATING DATA USING EFFICIENT FAST FOURIER TRANSFORM (FFT) FOR ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) 有权用于正交频分多址（OFDM）的有效快速傅里叶变换（FFT）通信数据的系统和方法公开(公告)号：US20090245084A1
公开(公告)日：2009-10-01
申请号：US12060292
申请日：2008-04-01
CPC分类号： H04L27/2628 , G06F17/142 , H04L27/265
摘要： A system communicates data and includes a transmitter for transmitting a communications signal that carries communications data. It includes an efficient modulator for approximating the frequencies of sine/cosine basis waveforms using complex exponential functions and adding and subtracting the complex exponential functions to generate an Orthogonal Frequency Division Multiplexed (OFDM) communications signal as a plurality of N data subcarriers that carry communications data as data symbols. A receiver receives the OFDM communications signal and includes a demodulation circuit for demodulating the OFDM communications signal using logical shifts of multiples +/−2p based on complex exponential functions corresponding to sine/cosine basis waveform approximations to extract amplitude and phase values from a plurality of N data subcarriers as data symbols within the OFDM communications signal.
摘要翻译： 系统通信数据并包括用于发送携带通信数据的通信信号的发射机。 它包括一个有效的调制器，用于使用复指数函数近似正弦/余弦基波形的频率，并且加上和减去复指数函数以产生正交频分复用（OFDM）通信信号作为携带通信数据的多个N个数据子载波 作为数据符号。 接收机接收OFDM通信信号，并且包括解调电路，用于使用基于与正弦/余弦基波形近似对应的复指数函数的倍数+/- 2p的逻辑移位来解调OFDM通信信号，以从多个 N个数据副载波作为OFDM通信信号内的数据符号。
-
4.发明申请SYSTEM AND METHOD FOR COMMUNICATING DATA USING EFFICIENT FAST FOURIER TRANSFORM (FFT) FOR ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) MODULATION 有权用于正交频分多址（OFDM）调制的有效快速傅里叶变换（FFT）通信数据的系统和方法公开(公告)号：US20090245406A1
公开(公告)日：2009-10-01
申请号：US12060283
申请日：2008-04-01
CPC分类号： H04L27/265 , G06F17/142 , H04L27/2628
摘要： A communications device includes at least one memory device for storing complex exponential functions as approximations of sine and cosine basis waveforms. A logic circuit adds and subtracts the complex exponential functions to generate an Orthogonal Frequency Division Multiplexed (OFDM) communications signal as a plurality of N data subcarriers that carry communications data. The logic circuit provides efficient and accurate implementation of the IFFT for use as an OFDM modulator using additions of stored complex exponentials and modulation of the integer-valued QAM data symbols using logic shifts and sign changes (2's complement).
摘要翻译： 通信设备包括至少一个用于存储复数指数函数作为正弦和余弦基波形近似的存储器件。 逻辑电路加上和减去复指数函数以产生正交频分复用（OFDM）通信信号作为携带通信数据的多个N个数据副载波。 逻辑电路提供了IFFT的有效和准确的实现，用于使用存储的复指数的加法和使用逻辑移位和符号变化（2的补码）对整数值QAM数据符号进行调制而用作OFDM调制器。
-
-
-
搜索结果
4 条记录 (耗时 0.025 秒)
