Wireless laser communication PPM polarization modulation and demodulation method本发明的无线激光通信PPM偏振调制解调方法,首先在信源的PPM信号与椭圆偏振角之间建立一一对应关系,根据该对应关系,将信源信号调制成具有对应椭圆偏振角的椭圆偏振光,并以光信号发射出;解调时,将接收到的椭圆偏振光的偏振角计算出,在根据上述...
针对脉冲位置调制(PPM)与多级编码结合中的错误传播问题,利用多阶段译码原理的"链式规则",提出一种基于迭代的解调译码方法,给出了8-PPM多级编码调制的硬判决迭代算法。仿真分析表明,迭代解调译码方法可以改善错误传播现象,降低系统的误码率;在相同迭代次数下,信道衰减越大,该译码方法获得的增益越明显。综合考虑性能改善...
故使用MATLAB 对欧氏几何构造的LDPC 码进行通信系统仿真,验证LDPC 码的性能。仿真共有两项实验: 仿真实验一:在信噪比不变的条件下,随着LDPC 码长增加,观察误码率变化情况。 在这一项仿真中,信噪比设置为6dB,LDPC 校验矩阵行重为4,LDPC 校验矩阵列重为2,PPM 调制阶数为2,迭代次数为5。仿真结果如图2 所示。 图...
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MPPM coding modem communication method and system for adaptive self-synchronization, the method comprising: using trellis-coded modulation and pulse position modulation ary composition TCM-MPPM joint modulation encoding; receiving end information from synchronous acquisition and adaptive demodulation and ...
MODULATION CIRCUIT, DEMODULATION CIRCUIT AND ON MODEM CIRCUIT SYSTEM ADOPTING PPM SYSTEMPROBLEM TO BE SOLVED: To reduce the current consumption by applying control to the demodulation and modulation circuits in a way that supply of a clock signal to a detection circuit is stopped until a succeeding...
PROBLEM TO BE SOLVED: To reduce the current consumption by applying control to the demodulation and modulation circuits in a way that supply of a clock signal to a detection circuit is stopped until a succeeding symbol time begins after the detection of a prescribed carrier pulse in existence ...
The modulation circuit which adopts PPM mode, the demodulator circuit and modulation and demodulation circuit systemPROBLEM TO BE SOLVED: To reduce the current consumption by applying control to the demodulation and modulation circuits in a way that supply of a clock signal to a detection circuit ...
PROBLEM TO BE SOLVED: To reduce the current consumption by applying control to the demodulation and modulation circuits in a way that supply of a clock signal to a detection circuit is stopped until a succeeding symbol time begins after the detection of a prescribed carrier pulse in existence ...