Why OFDM subcarriers are orthogonal — the math behind the “O”
OFDM subcarriers are orthogonal over a symbol period; how that yields independent flat bins after the DFT, and how CP protects that orthogonality.
OFDM
OFDM cyclic prefix length — how long must the CP be? (Matlab demo)
How long should the OFDM cyclic prefix be? CP must cover the channel delay spread so the FFT sees circular convolution — Matlab hands-on plus overhead calculator.
Breaking the Bandwidth Barrier – Li-Fi turns LED bulbs into High Speed Internet Hotspots
Researchers, working on Ultra-Parallel Visible Light Communications (UP-VLC) project, have demonstrated 3.5Gpbs free space data transmission via three separate micro-LEDs that emit red, blue and green colours. In effect, combining the three colours (that makes up for white colour), researchers say that achieving data rates over 10Gbps is feasible. The technology enabler here is called … Read more
OFDM BER vs Eb/N0 in Matlab — cyclic-prefixed MPSK/MQAM in AWGN
OFDM BER simulation vs Eb/N0 in Matlab with cyclic prefix: MPSK/MQAM on subcarriers in AWGN, and how results compare to single-carrier theory.
OFDM with the IFFT — mapping constellation symbols onto orthogonal subcarriers
OFDM part 3: packing QAM symbols onto subcarriers, IFFT to time domain, and how this builds the multicarrier waveform.
Introduction to OFDM — multicarrier idea, FDM vs OFDM, and the five-lesson path
OFDM study path — 5 lessons (same on every page in this series) 1. Introduction (you are here) → 2. Orthogonality → 3. IFFT modem → 4. Cyclic prefix → 5. BER in AWGN Tools: OFDM CP overhead calculator · Eb/N0 ↔ SNR converter In one sentence: OFDM shares bandwidth among many tightly spaced carriers … Read more