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
Cyclic prefix in OFDM — circular convolution and a Matlab hands-on demo
OFDM study path — 5 lessons (same on every page in this series) 1. Introduction → 2. Orthogonality → 3. IFFT modem → 4. Cyclic prefix (you are here) → 5. BER in AWGN Tools: OFDM CP overhead calculator · Eb/N0 ↔ SNR converter In one sentence: A cyclic prefix tricks a natural (linear) … Read more
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 simulation in AWGN — cyclic-prefixed MPSK and MQAM
OFDM study path — 5 lessons (same on every page in this series) 1. Introduction → 2. Orthogonality → 3. IFFT modem → 4. Cyclic prefix → 5. BER in AWGN (you are here) Tools: OFDM CP overhead calculator · Eb/N0 ↔ SNR converter In one sentence: Wire a discrete-time CP-OFDM chain (mapper → … Read more
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