Code Division Multiple Access
E566521
Code Division Multiple Access (CDMA) is a digital cellular technology that allows multiple users to share the same frequency band simultaneously by assigning unique codes to each user’s signal.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Code Division Multiple Access canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6042251 — 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: Code Division Multiple Access Context triple: [Time Division Multiple Access, contrastedWith, Code Division Multiple Access]
-
A.
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.
-
B.
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.
-
C.
MIMO
MIMO (Multiple-Input Multiple-Output) is a wireless communication technique that uses multiple transmitting and receiving antennas to significantly increase data throughput and link reliability.
-
D.
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.
-
E.
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.
- 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: Code Division Multiple Access Target entity description: Code Division Multiple Access (CDMA) is a digital cellular technology that allows multiple users to share the same frequency band simultaneously by assigning unique codes to each user’s signal.
-
A.
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.
-
B.
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.
-
C.
MIMO
MIMO (Multiple-Input Multiple-Output) is a wireless communication technique that uses multiple transmitting and receiving antennas to significantly increase data throughput and link reliability.
-
D.
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.
-
E.
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.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
digital cellular technology
ⓘ
multiple access technique ⓘ spread spectrum technology ⓘ |
| abbreviation | CDMA ⓘ |
| advantage |
graceful degradation of quality as load increases
ⓘ
higher spectral efficiency than many earlier cellular technologies ⓘ |
| allows | multiple users to share the same frequency band simultaneously ⓘ |
| application |
3G mobile networks
ⓘ
cellular mobile communication ⓘ military communication systems ⓘ satellite communication systems ⓘ |
| basedOn |
Code Division Multiple Access
NERFINISHED
ⓘ
Code Division Multiple Access NERFINISHED ⓘ Code Division Multiple Access NERFINISHED ⓘ |
| codeType |
Walsh code
ⓘ
pseudo-noise sequence ⓘ spreading code ⓘ |
| developedFor | cellular networks with higher capacity than analog systems ⓘ |
| distinguishesUsersBy | unique codes ⓘ |
| domain | wireless communications engineering ⓘ |
| feature |
frequency reuse of 1
ⓘ
inherent privacy through spreading codes ⓘ multipath diversity gain ⓘ power control requirement ⓘ resistance to narrowband interference ⓘ soft capacity limit ⓘ soft handoff ⓘ |
| fullName | Code Division Multiple Access NERFINISHED ⓘ |
| mitigates | near–far problem using power control ⓘ |
| multipleAccessComparison |
alternative to FDMA
ⓘ
alternative to TDMA ⓘ |
| operatesIn | time and frequency domains simultaneously ⓘ |
| requires |
accurate power control
ⓘ
synchronization between base station and mobile ⓘ |
| standardFamily |
CDMA2000
NERFINISHED
ⓘ
IS-95 NERFINISHED ⓘ UMTS WCDMA radio interface ⓘ WCDMA NERFINISHED ⓘ cdmaOne NERFINISHED ⓘ |
| suffersFrom | near–far problem ⓘ |
| supports |
circuit-switched voice
ⓘ
data services ⓘ packet-switched data ⓘ voice services ⓘ |
| uses |
RAKE receiver
ⓘ
code division multiplexing ⓘ orthogonal codes ⓘ pseudo-random codes ⓘ spread spectrum modulation ⓘ |
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: Code Division Multiple Access Description of subject: Code Division Multiple Access (CDMA) is a digital cellular technology that allows multiple users to share the same frequency band simultaneously by assigning unique codes to each user’s signal.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.