TC-PAM

In today's world, TC-PAM has become a topic of great interest and relevance. Over time, TC-PAM has significantly impacted different aspects of society, culture, politics and the economy. Since its inception, TC-PAM has played a fundamental role in people's daily lives and has sparked debates, discussions and deep reflections in various areas. In this article, we will further explore the impact and importance of TC-PAM, examining its many facets and its influence on the world today.

Modulation format used in HDSL2 and G.SHDSL

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Passband modulation
Analog modulation
AM SM SSB Angle modulation FM PM QAM
Digital modulation
ASK APSK CPM FSK MFSK MSK OOK PPM PSK QAM SC-FDE TCM TC-PAM WDM
Hierarchical modulation
QAM WDM
Spread spectrum
CSS DSSS FHSS THSS
See also
Capacity-approaching codes Demodulation Line coding Modem AnM PoM PAM PCM PDM PWM ΔΣM OFDM FDM Multiplexing
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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.^[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

1. ^ Johannes Huber. "Multilevel-Codes: Distance Profiles and Channel Capacity".

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