OFDMA
E494316
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.
Observed surface forms (1)
| Surface form | Occurrences |
|---|---|
| Orthogonal Frequency Division Multiple Access | 1 |
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
multiple access scheme
ⓘ
multi‑user version of OFDM ⓘ radio access technology ⓘ |
| allocates | subcarriers to different users ⓘ |
| appliedIn |
Wi‑Fi variants using OFDMA (e.g., IEEE 802.11ax)
ⓘ
broadband wireless access systems ⓘ cellular networks ⓘ fixed wireless access ⓘ |
| basedOn | OFDM NERFINISHED ⓘ |
| canUse | pilot subcarriers for channel estimation ⓘ |
| contrastedWith |
CDMA
NERFINISHED
ⓘ
FDMA NERFINISHED ⓘ SC‑FDMA NERFINISHED ⓘ TDMA ⓘ |
| enables |
frequency‑selective scheduling
ⓘ
high spectral efficiency ⓘ high system capacity ⓘ multiuser diversity ⓘ resource block‑based allocation ⓘ |
| fullName | Orthogonal Frequency Division Multiple Access NERFINISHED ⓘ |
| hasFeature |
fine‑grained subcarrier granularity
ⓘ
flexible bandwidth allocation ⓘ robustness to frequency‑selective fading ⓘ support for MIMO ⓘ support for beamforming ⓘ support for heterogeneous traffic types ⓘ |
| improves | cell throughput compared to single‑user OFDM scheduling ⓘ |
| requires |
accurate channel estimation
ⓘ
tight synchronization among users ⓘ |
| standardizedBy |
3GPP
NERFINISHED
ⓘ
IEEE NERFINISHED ⓘ |
| supports |
QoS‑aware scheduling
ⓘ
adaptive modulation and coding ⓘ dynamic subcarrier allocation ⓘ frequency‑domain multiple access ⓘ multiple users simultaneously ⓘ time‑frequency resource allocation ⓘ uplink and downlink multiuser access ⓘ |
| usedIn |
3GPP LTE‑Advanced
NERFINISHED
ⓘ
5G NR downlink (as CP‑OFDM multi‑user access) ⓘ IEEE 802.16e NERFINISHED ⓘ IEEE 802.16m NERFINISHED ⓘ LTE downlink ⓘ WiMAX NERFINISHED ⓘ |
| uses |
IFFT/FFT processing
ⓘ
cyclic prefix ⓘ orthogonal subcarriers ⓘ |
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Orthogonal Frequency Division Multiple Access