TC-PAM
Modulation format used in HDSL2 and G.SHDSL
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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Line coding (digital baseband transmission)
- Unipolar encoding
- Bipolar encoding
- On-off keying
- Mark and space
- Return to zero (RZ)
- Non-return-to-zero, level (NRZ/NRZ-L)
- Non-return-to-zero, inverted (NRZ-I)
- Non-return-to-zero, space (NRZ-S)
- Manchester
- Differential Manchester/biphase (Bi-φ)
- Conditioned diphase
- 4B3T
- 4B5B
- 2B1Q
- Alternate mark inversion
- Modified AMI code
- Coded mark inversion
- MLT-3 encoding
- Hybrid ternary code
- 6b/8b encoding
- 8b/10b encoding
- 64b/66b encoding
- Eight-to-fourteen modulation
- Delay/Miller encoding
- TC-PAM
- Carrier-suppressed return-to-zero
- Alternate-phase return-to-zero
- See also: Baseband
- Baud
- Bit rate
- Digital signal
- Digital transmission
- Ethernet physical layer
- Pulse modulation methods
- Pulse-amplitude modulation (PAM)
- Pulse-code modulation (PCM)
- Serial communication
- Category:Line codes
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TC-PAM