Frequency Division Duplex
E524099
Frequency Division Duplex is a communication method in which uplink and downlink transmissions occur simultaneously on separate frequency bands, commonly used in cellular and wireless networks.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Frequency Division Duplex canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5479737 — 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: Frequency Division Duplex Context triple: [FDD, abbreviationFor, Frequency Division Duplex]
-
A.
Time Division Duplex
Time Division Duplex is a wireless communication method that uses a single frequency band for both uplink and downlink by separating them in time rather than frequency.
-
B.
OFDMA
OFDMA (Orthogonal Frequency Division Multiple Access) is a multi-user version of OFDM that divides subcarriers among multiple users to enable efficient, high-capacity wireless communication in systems like LTE and WiMAX.
-
C.
SC-FDMA
SC-FDMA (Single-Carrier Frequency Division Multiple Access) is a multi-carrier transmission scheme used primarily in LTE uplink that combines single-carrier characteristics with frequency-domain equalization to achieve lower peak-to-average power ratio than OFDM.
-
D.
OFDM
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.
-
E.
Time Division Multiple Access
Time Division Multiple Access (TDMA) is a channel access method that divides a communication medium into time slots so multiple users can share the same frequency without interference.
- 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: Frequency Division Duplex Target entity description: Frequency Division Duplex is a communication method in which uplink and downlink transmissions occur simultaneously on separate frequency bands, commonly used in cellular and wireless networks.
-
A.
Time Division Duplex
Time Division Duplex is a wireless communication method that uses a single frequency band for both uplink and downlink by separating them in time rather than frequency.
-
B.
OFDMA
OFDMA (Orthogonal Frequency Division Multiple Access) is a multi-user version of OFDM that divides subcarriers among multiple users to enable efficient, high-capacity wireless communication in systems like LTE and WiMAX.
-
C.
SC-FDMA
SC-FDMA (Single-Carrier Frequency Division Multiple Access) is a multi-carrier transmission scheme used primarily in LTE uplink that combines single-carrier characteristics with frequency-domain equalization to achieve lower peak-to-average power ratio than OFDM.
-
D.
OFDM
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.
-
E.
Time Division Multiple Access
Time Division Multiple Access (TDMA) is a channel access method that divides a communication medium into time slots so multiple users can share the same frequency without interference.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
communication technique
ⓘ
duplexing method ⓘ |
| abbreviation | FDD ⓘ |
| alsoKnownAs | frequency‑division duplexing ⓘ |
| appliedInStandard |
5G NR FDD
ⓘ
GSM NERFINISHED ⓘ LTE FDD NERFINISHED ⓘ UMTS FDD NERFINISHED ⓘ cdma2000 NERFINISHED ⓘ |
| benefit |
good support for continuous services like voice
ⓘ
low latency between uplink and downlink ⓘ simultaneous voice and data transmission ⓘ |
| challenge |
less flexible for asymmetric traffic patterns
ⓘ
more complex RF hardware due to duplexers ⓘ requires paired spectrum allocation by regulators ⓘ |
| contrastedWith | Time Division Duplex NERFINISHED ⓘ |
| contrastsInResourceSeparationWith |
code separation in CDMA systems
ⓘ
time separation in TDD ⓘ |
| governedBy | spectrum allocation regulations ⓘ |
| hasDesignParameter |
channel bandwidth per direction
ⓘ
guard band width ⓘ uplink–downlink frequency separation ⓘ |
| hasProperty |
enables full duplex communication
ⓘ
less sensitive to uplink–downlink interference than TDD ⓘ often used in coverage‑oriented deployments ⓘ provides constant transmit and receive channels ⓘ requires paired spectrum ⓘ supports simultaneous uplink and downlink ⓘ uplink and downlink are separated by guard band ⓘ uses separate frequency bands for uplink and downlink ⓘ well suited for symmetric traffic ⓘ |
| implementedUsing |
guard band between uplink and downlink frequencies
ⓘ
separate downlink carrier frequency ⓘ separate uplink carrier frequency ⓘ |
| relatedConcept |
downlink frequency band
ⓘ
full‑duplex communication ⓘ paired spectrum band ⓘ uplink frequency band ⓘ |
| requires |
duplexer in radio front‑end
ⓘ
frequency planning for paired bands ⓘ |
| typicalIn | sub‑3 GHz cellular bands ⓘ |
| usedFor |
broad area cellular coverage
ⓘ
mobile data services ⓘ mobile voice services ⓘ |
| usedIn |
cellular networks
ⓘ
microwave links ⓘ mobile broadband networks ⓘ satellite communication systems ⓘ wireless communication systems ⓘ |
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: Frequency Division Duplex Description of subject: Frequency Division Duplex is a communication method in which uplink and downlink transmissions occur simultaneously on separate frequency bands, commonly used in cellular and wireless networks.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.