What I am looking is to find out which one provides faster data rate and is more robust. Which one is more prone to interference. In HSDPA a technique is used called Adaptive modulation and coding (AMC). Which means it changes the modulation scheme between QPSK & 16 QAM according to radio conditions.
2007-03-01 10:16:55 · 4 answers · asked by Mastang 2 in Science & Mathematics ➔ Engineering
What I am looking is to find out which one provides faster data rate and is more robust. Which one is more prone to interference. In HSDPA a technique is used called Adaptive modulation and coding (AMC). Which means it changes the modulation scheme between QPSK & 16 QAM according to radio conditions. Another query is
does this modulation changes when the UE is going through SoftHandover or compressed mode or
when the conditions are bad or All of the above?
2007-03-01 10:54:23 · update #1
Another query is
does this modulation changes when the UE is going through SoftHandover or compressed mode or
when the conditions are bad or All of the above?
2007-03-01 10:54:58 · update #2
16-QAM has a higher data rate (given the same bandwidth),
but has a higher error-rate with the same interference/noise
levels.
uhh, by default, I guess this would make QPSK "more robust"
High noise-levels, switch to QPSK .... when the noise dies down
(relative to signal strength) switch to 16-QAM
2007-03-01 10:48:42 · answer #1 · answered by atheistforthebirthofjesus 6 · 0⤊ 0⤋
Education is good, because it teaches you how to learn, how to discipline your mind. Knowledge for a Christian is knowing the word, knowing your God, His nature, His will, His outlook on things. Wisdom is looking at things from God's perspective and putting them into action. Knowledge is great, but too much of it can puff you up if you don't counteract it with fruit of the Spirit. Ever know a person who's very knowledgeable, but has no temperance and no love? Their knowledge is almost useless in the long run. But wisdom? You find that and your soul shall live, because when you find wisdom, you find the way God Himself looks at a situation. Proverbs 3: By wisdom the Lord laid the earth’s foundations, by understanding he set the heavens in place; by his knowledge the watery depths were divided, and the clouds let drop the dew.
2016-03-18 03:37:09 · answer #2 · answered by Sylvia 4 · 0⤊ 1⤋
Hi. QPSK depends on shifting the phase while QAM modulates the amplitude. Amplitude modulation is usually easier to disrupt. Found this other mode which may interest you. http://www.answers.com/topic/ofdm
2007-03-01 10:24:30 · answer #3 · answered by Cirric 7 · 1⤊ 0⤋
Qpsk Vs Qam
2016-11-12 08:26:49 · answer #4 · answered by Anonymous · 0⤊ 0⤋