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55
5.7 OFDMA
In telecommunications, Orthogonal Frequency-division Multiplexing (OFDM) is a type of digital
transmission and a method of encoding digital data on multiple carrier frequencies. OFDM divides
a channel into subcarriers, but only a single user can transmit on all of the sub-carriers at any given
time.
Orthogonal Frequency-division Multiple Access (OFDMA) is a multi-user version of the popular
OFDM digital modulation scheme. It also divides a channel into subcarriers which is further divided
into subsets, called Resource Units (RUs). These RUs can be assigned to multiple users, therefore
allowing simultaneous low-data-rate transmission from several users.
The mechanisms of OFDM and OFDMA are illustrated as below.
OFDM
OFDMA
To access the configuration page, log in to the web UI of the router, and choose WiFi Settings >
OFDMA. This function is disabled by default.
Router
Channel 1
Channel 2
Channel 3
User 1
User 2
User 3
Subcarrier
Subcarrier
Subcarrier
Subcarrier
Subcarrier
Subcarrier
Subcarrier
Subcarrier
Subcarrier
Router
Channel X
User 1
User 2
User 3
Subcarrier
Subcarrier
Subcarrier
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