作者IronHand (蹂躪之爪牙)
看板comm_and_RF
標題[請益] QPSK & 2-PAM*2
時間Wed Oct 24 11:12:15 2007
1.為什麼QPSK(4-PSK) & 兩個independent 2-PAM系統combined
的performance會相同呢
2.Consider a PSK system.
It is suggested to modify the system to enhance its BER performance.
There are two choices.
The first is to double the average transmitting power level.
The second is to duplicate the system on another carrier,
i.e. to use two independent radios duplicating the same information
data stream. Which one will you choose? Why?
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◆ From: 140.113.123.1
※ 編輯: IronHand 來自: 140.113.123.1 (10/24 11:13)
※ 編輯: IronHand 來自: 140.113.123.1 (10/24 11:16)
1F：→ lovewa:Q2:I think the choice2 can incrase diver 140.113.144.28 10/24 12:49
2F：→ lovewa:sity gain... 140.113.144.28 10/24 12:49
3F：→ lovewa:Q1:Two independent 2-PAM can be treat as 140.113.144.28 10/24 12:52
4F：→ lovewa:one QPSK modulation... 140.113.144.28 10/24 12:52
5F：→ lovewa:Q1:AWGN Channel, Q2:Fading Channel 140.113.144.28 10/24 12:53
6F：→ coye:Q1:not sure for non-defined labeling 140.113.236.9 10/24 19:33