Timeline for LTE questions (subcarriers and cyclic prefix)
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22 events
| when toggle format | what | by | license | comment | |
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| Apr 23, 2015 at 13:27 | vote | accept | Tyrone | ||
| Apr 23, 2015 at 7:10 | comment | added | Deve | That's right, the margins of the transmit band are unused. Reducing cross-band interference is one reason for doing that, the anti-aliasing filter is another. Maybe you should mention in you question that it refers to the LTE downlink (if it does), because the uplink is quite different. | |
| Apr 22, 2015 at 23:05 | answer | added | Naveen | timeline score: 3 | |
| Apr 21, 2015 at 20:18 | history | edited | Tyrone | CC BY-SA 3.0 |
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| Apr 21, 2015 at 15:40 | history | edited | Tyrone | CC BY-SA 3.0 |
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| Apr 21, 2015 at 14:55 | history | edited | Tyrone | CC BY-SA 3.0 |
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| Apr 21, 2015 at 14:54 | comment | added | Tyrone | I would have thought that the unused subcarriers are those at the left and right of the bandwidth and are unused for interference purposes. | |
| Apr 21, 2015 at 14:53 | comment | added | Tyrone | 600 are the data subcarriers. However 900 are the total available resource blocks for a 10 MHz system. which is equal to 75 * 12, 75 being the total number of resource blocks and 12 being the number of subcarriers in one resource block. | |
| Apr 21, 2015 at 14:51 | comment | added | Deve | Yes, this is done for oversampling. Some subcarriers are unused to faciliate anti-aliasing filtering at the receiver. You mention 600 and 900 data subcarriers in your question. Which number is correct? | |
| Apr 21, 2015 at 14:48 | comment | added | Tyrone | Do you have an idea, why the 1024-900 subcarriers are unused?@Deve | |
| Apr 21, 2015 at 14:43 | comment | added | Deve | Yes, the guard interval is usually implemented by a cyclic prefix. | |
| Apr 21, 2015 at 14:38 | history | edited | Tyrone | CC BY-SA 3.0 |
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| Apr 21, 2015 at 14:32 | history | edited | Tyrone | CC BY-SA 3.0 |
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| Apr 21, 2015 at 14:30 | comment | added | Tyrone | I see your point, I will edit the question accordingly so as to not confuse people. By guard interval do you mean Cyclic Prefix?@Deve | |
| Apr 21, 2015 at 14:24 | comment | added | Deve | Does the book mention "CP subcarriers"? I'm sure the "guard fraction" means the ratio of guard interval and OFDM symbol length. | |
| Apr 21, 2015 at 14:21 | comment | added | Tyrone | Actually I got this from a book called Fundamentals of LTE, in that book some constant G defined as Guard fraction is 0.07% of 2048 for CP. So I thought these are for the CP subcarriers. @Deve | |
| Apr 21, 2015 at 7:06 | comment | added | Deve | What exactly are "Cyclic Prefix subcarriers"? The CP is inserted in time domain. Do you have a reference for this type of subcarriers in LTE? | |
| Apr 21, 2015 at 4:08 | history | edited | Tyrone | CC BY-SA 3.0 |
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| Apr 21, 2015 at 1:31 | history | edited | Tyrone | CC BY-SA 3.0 |
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| Apr 21, 2015 at 0:15 | history | edited | Tyrone | CC BY-SA 3.0 |
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| Apr 21, 2015 at 0:05 | history | edited | Tyrone | CC BY-SA 3.0 |
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| Apr 20, 2015 at 23:58 | history | asked | Tyrone | CC BY-SA 3.0 |