We experimentally demonstrate a direct-detection orthogonal-frequency-division-multiplexing quadrature-phase-shift-keying (OFDM-QPSK) system that is capable of delivering a 32 Gbaud OFDM-QPSK signal over 7 km single-mode fiber-28 (SMF-28). Intra-symbol frequency-domain averaging (ISFA) channel response estimation is applied to suppress in-band noise, while discrete Fourier transform-spread (DFT-spread) is used to reduce the peak-to-average power ratio (PAPR) of the transmitted OFDM signal. With
、基于MATLAB构构建一个在高斯白噪声信道条件下的QPSK仿真系统,要求仿真结果有:
a. 基带输入波形及其功率谱密度,解调输出波形及其功率谱密度;
b. QPSK信号及其功率谱密度;
c. QPSK调制解调过程;
d. QPSK信号星座图,高斯噪声曲线;
e. 高斯白噪声信道条件下的误码性能以及高斯白噪声的理论曲线,要求所有误码性能曲线在同一坐标比例下绘制
2、撰写设计报告