作者IronHand (蹂躏之爪牙)
看板comm_and_RF
标题[请益] QPSK & 2-PAM*2
时间Wed Oct 24 11:12:15 2007
1.为什麽QPSK(4-PSK) & 两个independent 2-PAM系统combined
的performance会相同呢
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?
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 140.113.123.1
※ 编辑: IronHand 来自: 140.113.123.1 (10/24 11:13)
※ 编辑: IronHand 来自: 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