Editing Ternary signal

In [[telecommunications]], a '''ternary signal''' is a [[signal]] that can assume, at any given instant, one of three states or [[significant condition]]s, such as [[Power (physics)|power]] level, [[phase (waves)|phase]] position, [[pulse duration]], or [[frequency]].

Examples of ternary signals are (a) a pulse that can have a positive, zero, or negative voltage value at any given instant ([[pulse-amplitude modulation|PAM]]-3), (b) a sine wave that can assume phases of 0°, 120°, or 240° relative to a [[clock]] pulse (3-[[phase-shift keying|PSK]]), and (c) a [[carrier signal]] that can assume any one of three different frequencies depending on three different [[modulation]] signal significant conditions (3-[[frequency modulation|FM]]).

{{Modulation techniques}}

Some examples of PAM-3 [[line code]]s that use ternary signals are:
* [[hybrid ternary code]]
* [[bipolar encoding]]
* [[MLT-3 encoding]] used in [[Fast Ethernet#100BASE-TX|100BASE-TX Ethernet]]
* [[B3ZS]]
* [[4B3T]] used in some ISDN [[basic rate interface]]
* [[8B6T]] used in [[Fast Ethernet#100BASE-T4|100BASE-T4 Ethernet]]
* [[return-to-zero]]
* [[DQPSK#SOQPSK|SOQPSK-TG]] uses ternary continuous phase modulation<ref>{{cite journal |doi=10.1109/TCOMM.2008.041108 |title=PAM representation of ternary CPM |journal=IEEE Transactions on Communications |volume=56 |issue=12 |pages=2020–2024 |author1=Erik Perrins |author2=Michael Rice |publisher=[[IEEE]] |date=12 December 2008}}</ref>

3-PSK can be seen as falling between "binary phase-shift keying" ([[BPSK]]), which uses two phases, and "quadrature phase-shift keying" ([[QPSK]]), which uses four phases.

==References==
{{reflist}}
*{{FS1037C}}

==See also==
* [[Balanced ternary]]
* [[Digital signal (electronics)]]
* [[Fast Ethernet#100BASE-T2]] uses PAM-5, which, like ternary, is one of the few modulation schemes that does not use a power-of-two number of symbols.
* [[Ternary computer]]
* [[Three-phase electric power]], like 3-PSK, uses 3 phases at a single frequency and amplitude.
* [[Three-valued logic]]

{{DEFAULTSORT:Ternary Signal}}
[[Category:Line codes]]
[[Category:Ternary computers]]


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