OFDM
E115027
digital modulation scheme
multi-carrier modulation technique
orthogonal frequency-division multiplexing
OFDM (Orthogonal Frequency-Division Multiplexing) is a digital multi-carrier modulation technique that splits data across many closely spaced orthogonal subcarriers to improve robustness against interference and multipath fading in wireless and wired communication systems.
All labels observed (3)
| Label | Occurrences |
|---|---|
| OFDM canonical | 5 |
| OFDMA | 3 |
| Orthogonal Frequency-Division Multiplexing | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T970817 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: OFDM Context triple: [IEEE 802.16, uses, OFDM]
-
A.
IEEE 802.16
IEEE 802.16 is a family of broadband wireless access standards, commonly associated with WiMAX, that defines high-speed wireless metropolitan area networks.
-
B.
DVB-S2
DVB-S2 is an advanced digital satellite television broadcasting standard widely used in Europe and beyond for efficient, high-quality transmission of TV and data services.
-
C.
IEEE 802.17
IEEE 802.17 is a networking standard that defines resilient packet ring (RPR) technology for efficient, high-speed data transport in metropolitan area networks.
-
D.
LTE
LTE (Long Term Evolution) is a high-speed wireless communication standard for mobile devices and data terminals, widely used as the foundation of 4G cellular networks.
-
E.
IEEE 802.18
IEEE 802.18 is the Radio Regulatory Technical Advisory Group within the IEEE 802 standards community that focuses on spectrum and regulatory issues affecting wireless LAN and MAN technologies.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: OFDM Target entity description: OFDM (Orthogonal Frequency-Division Multiplexing) is a digital multi-carrier modulation technique that splits data across many closely spaced orthogonal subcarriers to improve robustness against interference and multipath fading in wireless and wired communication systems.
-
A.
IEEE 802.16
IEEE 802.16 is a family of broadband wireless access standards, commonly associated with WiMAX, that defines high-speed wireless metropolitan area networks.
-
B.
DVB-S2
DVB-S2 is an advanced digital satellite television broadcasting standard widely used in Europe and beyond for efficient, high-quality transmission of TV and data services.
-
C.
IEEE 802.17
IEEE 802.17 is a networking standard that defines resilient packet ring (RPR) technology for efficient, high-speed data transport in metropolitan area networks.
-
D.
LTE
LTE (Long Term Evolution) is a high-speed wireless communication standard for mobile devices and data terminals, widely used as the foundation of 4G cellular networks.
-
E.
IEEE 802.18
IEEE 802.18 is the Radio Regulatory Technical Advisory Group within the IEEE 802 standards community that focuses on spectrum and regulatory issues affecting wireless LAN and MAN technologies.
- F. None of above. chosen
Statements (83)
| Predicate | Object |
|---|---|
| instanceOf |
digital modulation scheme
ⓘ
multi-carrier modulation technique ⓘ orthogonal frequency-division multiplexing ⓘ |
| appliedIn |
4G LTE
ⓘ
5G NR ⓘ xDSL technologies ⓘ
surface form:
ADSL
DAB ⓘ DVB-T ⓘ DVB-T2 ⓘ IEEE 802.11 ⓘ
surface form:
IEEE 802.11a
Wi‑Fi 5 ⓘ
surface form:
IEEE 802.11ac
Wi‑Fi 6 ⓘ
surface form:
IEEE 802.11ax
IEEE 802.11 ⓘ
surface form:
IEEE 802.11g
IEEE 802.11 ⓘ
surface form:
IEEE 802.11n
IEEE 802.16 ⓘ PLC (Power Line Communication) ⓘ
surface form:
PLC
xDSL technologies ⓘ
surface form:
VDSL
Wi-Fi ⓘ IEEE 802.16 ⓘ
surface form:
WiMAX
broadband access systems ⓘ broadband over power lines ⓘ digital audio broadcasting ⓘ digital subscriber line ⓘ digital video broadcasting ⓘ optical OFDM systems ⓘ powerline communication ⓘ wired communication systems ⓘ wireless communication systems ⓘ |
| canUse |
16-QAM
ⓘ
256-QAM ⓘ 64-QAM ⓘ QPSK ⓘ |
| enables |
efficient use of spectrum
ⓘ
high data rate transmission ⓘ multiuser access with OFDMA ⓘ simple equalization in frequency domain ⓘ |
| fullName |
OFDM
self-linksurface differs
ⓘ
surface form:
Orthogonal Frequency-Division Multiplexing
|
| hasComponent |
FFT demodulator
ⓘ
IFFT modulator ⓘ channel estimator ⓘ cyclic prefix ⓘ data subcarriers ⓘ equalizer ⓘ guard interval ⓘ null subcarriers ⓘ parallel-to-serial converter ⓘ pilot subcarriers ⓘ serial-to-parallel converter ⓘ set of orthogonal subcarriers ⓘ symbol mapper ⓘ |
| hasProperty |
flexible subcarrier allocation
ⓘ
high peak-to-average power ratio ⓘ high spectral efficiency ⓘ requires linear power amplification ⓘ requires precise synchronization ⓘ robustness to multipath fading ⓘ robustness to narrowband interference ⓘ sensitivity to frequency offset ⓘ sensitivity to phase noise ⓘ supports MIMO techniques ⓘ supports adaptive coding per subcarrier ⓘ supports adaptive modulation per subcarrier ⓘ supports frequency diversity ⓘ supports time diversity ⓘ |
| mitigates |
frequency-selective fading
ⓘ
inter-symbol interference ⓘ |
| relatedTo |
IMT-2000 family
ⓘ
surface form:
CDMA
OFDMA ⓘ SC-FDMA ⓘ single-carrier modulation ⓘ |
| requires |
channel estimation
ⓘ
frequency synchronization ⓘ time synchronization ⓘ |
| standardizedIn |
5G NR
ⓘ
surface form:
3GPP 5G NR specifications
3GPP LTE specifications ⓘ DAB standards ⓘ DVB standards ⓘ IEEE 802.11 ⓘ
surface form:
IEEE 802.11 family
IEEE 802.16 ⓘ
surface form:
IEEE 802.16 family
|
| uses |
Cooley–Tukey Fast Fourier Transform algorithm
ⓘ
surface form:
FFT
IFFT ⓘ multi-carrier transmission ⓘ orthogonal subcarriers ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: OFDM Description of subject: OFDM (Orthogonal Frequency-Division Multiplexing) is a digital multi-carrier modulation technique that splits data across many closely spaced orthogonal subcarriers to improve robustness against interference and multipath fading in wireless and wired communication systems.
Referenced by (9)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
OFDMA
this entity surface form:
OFDMA
this entity surface form:
OFDMA
subject surface form:
ATSC 3.0
this entity surface form:
Orthogonal Frequency-Division Multiplexing