Orthogonal Frequency Division Multiple Access

Supports multi-user on top of OFDM

Real-World Applications

4G LTE / 5G multiple access method, WiFi 6 (802.11ax) core upgrade. Previously WiFi routers sent one truck to deliver to one house, now one truck can carry goods for 8 houses (on different subcarriers), greatly reducing latency.

Experiment Steps

Resource Scheduling: Allocate subcarriers based on channel quality

Simulation Experiment

OFDMA Multi-User Resource Allocation

Subcarrier Allocation Pattern

Channel Quality per User

User Throughput Distribution

Localized: Each user gets contiguous subcarriers. Better for frequency-selective scheduling when channel quality varies across frequency.

Distributed: Subcarriers interleaved among users. Provides frequency diversity, more robust to narrowband interference.

Parameters(Real-time)

Num Users4

Total Subcarriers256

Allocation (0=Contiguous, 1=Distributed)0

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