LDPC编码调制系统中基于反馈LLR均值的迭代解调／译码算法-LDPC coded modulation systems based on iterative feedback from the mean LLR demodulator/decoding algorithm

qpsk modulator demodulator

高码速率QPSK解调器的设计，对于高码率的情况QPSK的设计方案-High code rate of the QPSK demodulator design, for the case of high rate design QPSK

We have proposed a digitally implemented QPSK system for Free-Space Optics (FSO) systems for future satellite missions. We have used a Laser source of 1550nm wavelength and data rate of 2.5Gbps.The system consists of a modulating and a demodulating b