Part 3 discusses Direct Sequence Spread Spectrum (DSSS) and Orthogonal Frequency Division Multiplex (OFDM) techniques. Another form of modulation that is widely used, especially for data transmissions ...

For a “reasonable” phase waveform deviation (aka small angle..., small modulation index..., or narrowband PM...approximation) of ≤ 0.2 rad (≤ 11.5°), where a PM spectrum is basically ...