CDMA
E744870
CDMA (Code Division Multiple Access) is a digital cellular technology that allows multiple users to share the same frequency spectrum simultaneously by assigning unique codes to each communication.
All labels observed (2)
How this entity was disambiguated
This entity first appeared as the object of triple T8602752 — 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: CDMA Context triple: [Motorola StarTAC, supportedStandard, CDMA]
-
A.
D-AMPS
D-AMPS (Digital Advanced Mobile Phone System) is a second-generation (2G) digital mobile telephony standard that evolved from the analog AMPS system to provide improved capacity and voice quality.
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B.
TD-SCDMA
TD-SCDMA is a 3G mobile telecommunications standard developed in China that uses time-division duplexing and code division multiple access to provide wireless voice and data services.
-
C.
UMTS
UMTS is a third-generation (3G) mobile telecommunications system that provides higher-speed voice and data services over cellular networks.
-
D.
HSDPA
HSDPA (High-Speed Downlink Packet Access) is a 3G mobile telephony protocol that significantly increases data download speeds and network capacity for users on compatible cellular networks.
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E.
IMT-2000 family
The IMT-2000 family is the ITU-defined global standard framework for third-generation (3G) mobile communication systems, encompassing multiple technologies such as UMTS and CDMA2000.
- 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: CDMA Target entity description: CDMA (Code Division Multiple Access) is a digital cellular technology that allows multiple users to share the same frequency spectrum simultaneously by assigning unique codes to each communication.
-
A.
D-AMPS
D-AMPS (Digital Advanced Mobile Phone System) is a second-generation (2G) digital mobile telephony standard that evolved from the analog AMPS system to provide improved capacity and voice quality.
-
B.
TD-SCDMA
TD-SCDMA is a 3G mobile telecommunications standard developed in China that uses time-division duplexing and code division multiple access to provide wireless voice and data services.
-
C.
UMTS
UMTS is a third-generation (3G) mobile telecommunications system that provides higher-speed voice and data services over cellular networks.
-
D.
HSDPA
HSDPA (High-Speed Downlink Packet Access) is a 3G mobile telephony protocol that significantly increases data download speeds and network capacity for users on compatible cellular networks.
-
E.
IMT-2000 family
The IMT-2000 family is the ITU-defined global standard framework for third-generation (3G) mobile communication systems, encompassing multiple technologies such as UMTS and CDMA2000.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
digital cellular technology
ⓘ
multiple access scheme ⓘ |
| allows | multiple users to share the same frequency band simultaneously ⓘ |
| appliedIn | 3GPP UMTS as WCDMA ⓘ |
| basedOn | spread-spectrum modulation ⓘ |
| canBe |
asynchronous
ⓘ
synchronous ⓘ |
| contrastedWith |
FDMA
ⓘ
linked to:
Frequency Division Duplex
TDMA ⓘ |
| developedBy | Qualcomm ⓘ |
| distinguishesUsersBy | unique spreading codes ⓘ |
| enables | higher user capacity compared to FDMA and TDMA in many scenarios ⓘ |
| feature |
frequency reuse of 1
ⓘ
inherent security through code spreading ⓘ resistance to narrowband interference ⓘ soft capacity limit ⓘ soft handoff ⓘ |
| fullName | Code Division Multiple Access ⓘ |
| introducedInCommercialSystems | 1990s ⓘ |
| mitigates | multipath fading through diversity combining ⓘ |
| operatesIn | code domain ⓘ |
| requires |
RAKE receivers for multipath combining
ⓘ
power control ⓘ synchronization between base station and mobiles in some variants ⓘ |
| standardizedBy |
3GPP2
ⓘ
TIA ⓘ |
| suffersFrom | near–far problem ⓘ |
| supports |
data communication
ⓘ
packet data services ⓘ voice and data multiplexing on same carrier ⓘ voice communication ⓘ |
| usedIn |
3G mobile systems
ⓘ
GPS spread-spectrum signaling ⓘ cellular networks ⓘ military communication systems ⓘ satellite communication systems ⓘ |
| usedInStandard |
CDMA2000
ⓘ
IS-95 ⓘ WCDMA ⓘ
linked to:
UMTS
cdmaOne ⓘ
linked to:
IS-95
|
| uses |
Walsh codes in IS-95 downlink
ⓘ
chip rate higher than data rate ⓘ orthogonal codes for downlink in many systems ⓘ pseudorandom noise sequences ⓘ spread spectrum technology ⓘ spreading codes ⓘ |
| variant |
direct-sequence CDMA
ⓘ
frequency-hopping CDMA ⓘ |
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: CDMA Description of subject: CDMA (Code Division Multiple Access) is a digital cellular technology that allows multiple users to share the same frequency spectrum simultaneously by assigning unique codes to each communication.
Referenced by (9)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: CDMA