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.
Observed surface forms (4)
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 ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.