Given the convolutional encode defined by:
And assuming data is fed into the shiftregister one bit at a time:
1)Draw the encoder.
2)Tree diagram to four levels.
Solution:
(n,m,k) 此题n=1,m=2,k=3
1)
2)开始移入寄存器为0或1(上为0,下为1),如图1所示,此时u1u2=00,(每一次分叉寄存器内的值右移1位),如图2所示,最左端寄存器值为空,可输入0或1,输入0时,u1u2=00;输入1时,u1u2=11;以此类推,执行的是异或功能
图 1 图 2