作者supsymmetry (supsymmetry)
看板comm_and_RF
标题[问题] 关于噪声uniformly分布时候比特错误概率的问题
时间Fri Jan 5 11:56:03 2007
A binary communication system transmits signals s_i(t)(i=1,2).The receiver t
est statistic z(T)=a_i+n_0, where the signalcomponent a_i is either a_1=1 or
a_2=-1 and the noise component n_0 is uniformly distributed, yielding the c
onditional density functions p(z|s_i) given by
p(z|s_1)=1/2 for -0.2<=z<=1.8
0 otherwise
and
p(z|s_2)=1/2 for -1.8<=z<=0.2
0 otherwise
Find the probability of a bit error, P_B, for the case of equally likely sig
naling and the use of an optimum decision threshold.
我才判决水平应该是\gamma=0,然后bit error probability 应该是
\int_{-0.2}^{0}1/2dz=0.1的.
但是怎么都不能从原来的题目的已知中推导出来.
求求解思路.谢谢.
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※ supsymmetry:转录至看板 Statistics 01/05 11:58
1F：→ lovewa:解题思路:MAP -> Decision Threshold -> Pe 140.115.152.45 01/06 01:50
2F：→ lovewa:0.2*(1/2) * 1/2 * 2 = 0.1 140.115.152.45 01/06 01:52