TC-PAM: Difference between revisions
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{{Short description|Modulation format used in HDSL2 and G.SHDSL}} |
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{{Refimprove|date=August 2009}} |
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'''Trellis-coded pulse-amplitude modulation''' ('''TC-PAM''') is the [[modulation]] format that is used in [[HDSL2]] and [[G.SHDSL]]. It is a variant of [[trellis coded modulation]] (TCM) which uses a one-dimensional [[pulse-amplitude modulation]] (PAM) symbol space, as opposed to a two-dimensional [[quadrature amplitude modulation]] (QAM) symbol space.<ref>Johannes Huber. [https://web.archive.org/web/20160304035913/http://www.lit.eei.uni-erlangen.de/papers/itg_hub_94.pdf "Multilevel-Codes: Distance Profiles and Channel Capacity"].</ref> Compared to the [[2B1Q]] scheme used in the older [[HDSL]] and [[Symmetric digital subscriber line|SDSL]] standards, TC-PAM improves range at a given bit-rate and provides enhanced spectral compatibility with [[ADSL]]. |
'''Trellis-coded pulse-amplitude modulation''' ('''TC-PAM''') is the [[modulation]] format that is used in [[HDSL2]] and [[G.SHDSL]]. It is a variant of [[trellis coded modulation]] (TCM) which uses a one-dimensional [[pulse-amplitude modulation]] (PAM) symbol space, as opposed to a two-dimensional [[quadrature amplitude modulation]] (QAM) symbol space.<ref>Johannes Huber. [https://web.archive.org/web/20160304035913/http://www.lit.eei.uni-erlangen.de/papers/itg_hub_94.pdf "Multilevel-Codes: Distance Profiles and Channel Capacity"].</ref> Compared to the [[2B1Q]] scheme used in the older [[HDSL]] and [[Symmetric digital subscriber line|SDSL]] standards, TC-PAM improves range at a given bit-rate and provides enhanced spectral compatibility with [[ADSL]]. |
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TC-PAM is also known as '''4B1H''', because it uses 16 levels to represents a 4 digit binary, 4 [[Binary code|Binary]] 1 [[Hexadecimal]]. |
TC-PAM is also known as '''4B1H''', because it uses 16 levels to represents a 4 digit binary, 4 [[Binary code|Binary]] 1 [[Hexadecimal]]. |
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==References== |
==References== |
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Revision as of 19:16, 29 December 2023
 | This article needs additional citations for verification. (August 2009) |
Trellis-coded pulse-amplitude modulation (TC-PAM) is the modulation format that is used in HDSL2 and G.SHDSL. It is a variant of trellis coded modulation (TCM) which uses a one-dimensional pulse-amplitude modulation (PAM) symbol space, as opposed to a two-dimensional quadrature amplitude modulation (QAM) symbol space.[1] Compared to the 2B1Q scheme used in the older HDSL and SDSL standards, TC-PAM improves range at a given bit-rate and provides enhanced spectral compatibility with ADSL.
TC-PAM is also known as 4B1H, because it uses 16 levels to represents a 4 digit binary, 4 Binary 1 Hexadecimal.
References
- ^ Johannes Huber. "Multilevel-Codes: Distance Profiles and Channel Capacity".
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