论文部分内容阅读
设计了一种基于IFFT/FFT的高效OFDM调制解调器,实现数模同播音频广播系统中数字音频信号的OFDM调制解调,包括发射机中用于形成OFDM符号的时域与频域交织模块、OFDM调制模块和接收机中OFDM解调模块、时域与频域解交织模块。通过对IFFT/FFT算法的改进,该OFDM调制解调器中数据的输入顺序和输出顺序相同,不需要进行顺序输入逆序输出,并且可以把现有基2的幂次方的FFT变换扩展到任意点,实现适用于任意点的IFFT/FFT,简化了IFFT/FFT模块本身和交织/解交织的资源消耗,巧妙地节省了系统所需的资源。
An efficient OFDM modem based on IFFT / FFT is designed to realize the OFDM modulation and demodulation of digital audio signal in digital simulcast audio broadcasting system, including the time domain and frequency domain interleaving module used to form OFDM symbols in the transmitter, OFDM Modulation module and receiver OFDM demodulation module, time domain and frequency domain deinterleaving module. Through the improvement of the IFFT / FFT algorithm, the input order and the output order of the data in the OFDM modem are the same, no sequential input reverse order output is required, and the FFT transform of the exponentiation of the existing base 2 can be extended to any point to achieve The IFFT / FFT for any point simplifies the IFFT / FFT module itself and the resource consumption of interleaving / deinterleaving, saving the system resources ingeniously.