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Direct-sequence spread spectrum (DSSS) is based onpulse-amplitude modulation. Frequency-hopping spread spectrum (FHSS) could be based on any modulation scheme.
Regarding the latest revisions to the template: (See the 7 June 2007 version to the right)
OFDM should be considered as a modulation technique rather than a multiplex technique, because that is how it is utilized (for transferring one bit-stream of useful data from one user to another), and that is how it is presented in the literature. Don't confuseOFDM withOFDMA, which is a multiple access technique. "OFDM modulation" gives 100.000 hits in google, while "OFDM multiplexing" gives 198 hits. For further arguments, see theOFDM andmodulation articles.
A list of Digital multiplexing techniques or topics were added to the Modulation techniques template, but that I think that is outside the topic. I suggest that multiplexing should either be moved into a separatetemplate:multiplex techniques, or the modulation template should change name to for exampletemplate:Physical layer issues ordata transmission techniques.
Multiplexing is a huge topic, and if we keep this, several cathegories should be added, for example statistical multiplexing, FDM, etc. And why only digital?
CDMA is a multiple access technique, and not only a multiplexing technique, and should therefor be removed. It is however based on the DSSS multiplex technique.Multiplexing is carried out by the physical layer, and should not be mixed up with multiple access protocols =media access control. The latter is based on a multiplexing technique, but also by a protocol at the MAC sublayer of the data link layer.
OFDM is a tricky one. While it really isn't a different modulation from QAM (from performance analysis point of view), but more like an especially nice implementation, it is not a multiplexing or medium access technuque either. But of these categories, it should be in the digital modulation section (or could there be use also for discrete-time analog OFDM??).
If the template contained only pure modulation schemes, it would be a bit a bit small and that's why I think there is room for more. On the other hand, multiplexing and medium access are wide topics and not always even related to modulation (although sometimes they are). So I think we shouldn't include them. Spread-spectrum could be related enough to keep here.Alinja07:11, 21 June 2007 (UTC)[reply]
Has some kind of error been made in this template's category? For one thing, I don't think this template talk page is supposed to show in the template category and more important surely nobody intended that all the articles with a modulation template be automatically categorized as being about templates. Anybody understand the formatting involved? Something about a noinclude anchor or something?Jim.henderson14:38, 30 June 2007 (UTC)[reply]
I don't claim to be any sort of expert in modulation techniques. But from an organization-of-information perspective, I can't help but notice:
Wavelet modulation as a term never appears directly, but linked asWDM it appears in both Digital and Hierarchal. It appeared athird time asWOFDM in the See Alsos until I removed that redundancy.
AnM,PoM,PAM,PCM,PWM,andΔΣM are all relegated to the See Alsos, despite (according to their titles) being articles about modulation techniques. Is there a subdivision/heading that could be added to the main template listing that would cover them, instead of just being See Alsos?
I've seen the arguments forOFDM being included here. But shouldFDM be, when that article doesn't include this template? Or is linking toMultiplexing sufficient? (Leaving FDM to be covered byTemplate:Multiplex techniques, which is transcluded in the Multiplexing article.)
Merely looking to spark discussion, and as I said I'm no expert. The redundancy gives me pause, and makes me wonder if there isn't a better way to organize things so that those articles are represented singly in a way that covers all relevant bases. ("Hybrid modulation"?) But I'm happy to be told "it's fine the way it is" if, indeed, it is. --FeRD_NYC (talk)06:20, 23 July 2017 (UTC)[reply]
