Code Division Multiple Access

E566521

digital cellular technology multiple access technique spread spectrum technology

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.

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All labels observed (1)

Label	Occurrences
Code Division Multiple Access canonical	8

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 ⓘ Code Division Multiple Access ⓘ Code Division Multiple Access ⓘ
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 ⓘ
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 ⓘ IS-95 ⓘ UMTS WCDMA radio interface ⓘ WCDMA ⓘ linked to: UMTS cdmaOne ⓘ linked to: CDMA
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 ⓘ