size、循环前缀,以及FFT方向运行时间(run time)的变化,必须对这些run time信号进行缓冲并把它们与输出数据数据包开始(SOP)信号对齐。Therefore, in every control module of OFDM modulation and demodulation, some logic is dedicated to signal alignment.因此,在OFDM调制解调中的每个控制模块中都有一些逻辑信号专用于...
PROBLEM TO BE SOLVED: To prevent degradation of detection accuracy without increasing a circuit scale by using a normal OFDM modem circuit, transmitting start symbol signals for two times in a parallel/serial conversion circuit and thus generating OFDM signals for synchronization whose cycle is Tw ...
This design example shows OFDM (or orthogonal frequency division multiplexing) modulation and demodulation. Learn more about implementing OFDM modulation and demodulation.
对每个OFDM符号进行IFFT 在openair1\PHY\MODULATION\ofdm_mod.c中引入的头文件中,找到了PHY_ofdm_mod的详细定义(通过循环扩展或者补零完成调制过程) PDCCH是下行控制信道,在PHY/defs_common.h中可找到PDCCH_CONFIG的定义 在进入PHY/impl_defs_top.h后找到相关OFDM调制的过程 _PHY_MODULATION_ Modulation and Demodu...
OFDM modulation and demodulation are typically (as of 2001) implemented using数字滤波器banks generally using the快速弗利叶变换(FFT). Although highly complex, COFDM has high performance under even very challenging channel conditions. By combining the OFDM technique with error-correcting codes, adaptive ...
Therefore, in every control module of OFDM modulation and demodulation, some logic is dedicated to signal alignment.因此,在OFDM调制解调中的每个控制模块中都有一些逻辑信号专用于信号对齐。 该实例中也通过Avalon Stream信号sink_ready(输入准备好信号)和source_ready(输出准备好信号)来支持背压。循环前缀插入...
Modulation and demodulation in most real systems is made easier by using powers of two for the number of sub-carriers. 应用指南 This paper proposes solutions to address the problem of generating and analyzing orthogonal frequency division multiplexing (ODDM) waveforms. Multipath Considerations Let...
OFDM技术基本原理 OFDM是一种特殊的多 载波传输方案,它通过 串并转换将高速数据流 分配到若干并行的低速 子信道中进行传输 并行多载波传输对抗频 率选择性衰落的性能比 串行传输要强, 对抗ISI 的能力比串行传输要强 2.1 OFDM基本原理 Modulation and Demodulation in an OFDM System ∫ P/S ∫∫ + Channel S/P...
Demodulation of OFDM Signals As we have observed above, the modulator in an OFDM system can be implemented by computing the IDFT. The demodulator that recovers the information symbols {Xk} from the received signal samples is implemented by computing the DFT. ...
MODULATION DEVICE, MODULATION METHOD, DEMODULATION DEVICE, AND DEMODULATION METHOD A modulation device of the present invention has: a modulation unit (51) for modulating a carrier (42) in an audible sound range by an encoded transmission signal (3) to generate a modulated signal; a masker sound...