Timeline for OFDM use a pulse shaping filter or not?
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| Mar 26, 2022 at 16:34 | history | edited | Dan Boschen | CC BY-SA 4.0 |
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| Apr 15, 2021 at 11:07 | comment | added | Dan Boschen | @AlexTP it is effectively the same: for a given data set I can send it with a single carrier or I can effectively split the data up amongst many lower data rate carriers all evenly spaced and transmit in parallel. The pulse shaping would be just as effective but scaled down proportionally, so to the extent pulse shaping is needed in a single carrier modulation that is much reduced in OFDM | |
| Apr 15, 2021 at 7:51 | comment | added | AlexTP | Your point is convincing though, but do you know why in practice, for example in LTE, we need to reserve about 40% subcarriers at the borders of bandwidth, and also apply spectrum masks to avoid out-of-band interference? | |
| Apr 15, 2021 at 7:51 | comment | added | AlexTP | Interesting point. However, we don't take a mono-carrier bandwidth and divide it by a number of subcarriers, but rather keep a certain subcarrier-spacing and multiply it with a very important number of subcarriers. Indeed, I often see OFDM systems with large bandwidth. | |
| Mar 27, 2021 at 12:21 | history | edited | Dan Boschen | CC BY-SA 4.0 |
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| Mar 27, 2021 at 12:14 | history | edited | Dan Boschen | CC BY-SA 4.0 |
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| Mar 27, 2021 at 12:07 | history | answered | Dan Boschen | CC BY-SA 4.0 |