14.4.1.4.2 High Data Rate Frame Structure

In order to allow robust frame synchronization, the AT86RF212B high data rate modulation is restricted to the PSDU part only. The PPDU header (the preamble, the SFD, and the PHR field) are transmitted with a rate of either 100kb/s or 250kb/s (basic rates).

Figure 14-38. High Date Rate Frame Structure

Due to the overhead caused by the PPDU header and the FCS, the effective data rate is less than the selected data rate, depending on the length of the PSDU. A graphical representation of the effective data rate is shown in the figure below.

Figure 14-39. Effective Data Rate “B” for O-QPSK High Data Rate Modes

Consequently, high data rate transmission is useful for large PSDU lengths due to the higher effective data rate, or in order to reduce the power consumption of the system.