作者supsymmetry (supsymmetry)
看板comm_and_RF
標題[問題] 關于噪聲uniformly分布時候比特錯誤概率的問題
時間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.
我才判決水平應該是\gamma=0,然后bit error probability 應該是
\int_{-0.2}^{0}1/2dz=0.1的.
但是怎么都不能從原來的題目的已知中推導出來.
求求解思路.謝謝.
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◆ From: 59.51.155.162
※ supsymmetry:轉錄至看板 Statistics 01/05 11:58
1F：→ lovewa:解題思路: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