作者supsymmetry (supsymmetry)
看板comm_and_RF
標題Re: [問題] 請問BPSK coherently demodulation pha …
時間Sat Jan 13 15:41:48 2007
If there is a time synchronization bias, for example pT where p is between (
0,1) and T is the bit time, what's the bit error probability of the coherent
ly detected BPSK?
Thanks in advance.
※ 引述《Leon (Achilles)》之銘言：
: ※ 引述《supsymmetry (supsymmetry)》之銘言：
: : 一個BPSK modulated的信號,在demodulated的時候,如果reference signal的phase
: : 有一個固定的error,比如\phei.也就是說,如果BPSK信號為cos(wt)和-cos(wt);而接
: : 受端的reference signals是 cos(wt+\phei)和 -cos(wt+phei).
: : 那么bit error probability會怎么變化呢?
: : 求一個詳細的公式,找了半天沒找到.
: : Thanx in advance.
: Check the Synchronization chapter.
: Now your min-distance in the vector space will reduce by the factor,
: cos(r), where r is the phase noise.
: by the way, in BPSK,
: the transmitted signal is cos(wt) , cos(wt + pi),
: if you want to add phase noise in it,
: it should be cos(wt + r), cos(wt + pi + r).
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