Transmission Apparatus Adaptive Preamble Insertion for Channel Capacity

The patent extracts the preamble insertion operation from being applied to all protocol data units and applies it selectively only to the first protocol data unit in the aggregated A-PPDU. This extraction principle removes unnecessary preamble insertions from subsequent PPDUs, reducing overhead while maintaining the essential synchronization and channel estimation functions in the first PPDU, thereby improving transmission efficiency without significantly compromising reception characteristics.

The patent makes the preamble insertion mechanism universal across different PPDU positions by introducing conditional logic based on PPDU index. The same preamble structure serves multiple functions: it provides synchronization and channel estimation for its own PPDU, and when placed in the first PPDU, it also serves as a reference for subsequent PPDUs in the aggregation, reducing the need for redundant preambles in later PPDUs.

The patent extracts the preamble insertion operation from being applied to all protocol data units and applies it selectively only to the first protocol data unit in the aggregated A-PPDU. This extraction principle removes unnecessary preamble insertions from subsequent PPDUs, reducing overhead while maintaining the essential synchronization and channel estimation functions in the first PPDU, thereby improving transmission efficiency without significantly compromising reception characteristics.

Instead of applying preamble insertion to all PPDUs (excessive action), the patent applies it partially only to the first PPDU. This partial action is sufficient to provide the necessary spatial separation and channel estimation for the aggregated transmission, as subsequent PPDUs can leverage the channel information from the first PPDU's preamble, thereby reducing circuit complexity while maintaining channel capacity.

The patent introduces dynamic conditional logic that adjusts preamble insertion based on the PPDU index and MCS change detection. The system dynamically determines whether to insert a preamble in each PPDU by checking if it's the first PPDU and whether MCS has changed, allowing the transmission system to adapt to varying channel conditions and MCS requirements while minimizing unnecessary preamble insertions, thus balancing adaptability with overhead reduction.

The patent implements a feedback mechanism where the system monitors MCS changes between consecutive PPDUs and uses this information to control preamble insertion. The MCS change detection feedback allows the system to intelligently decide when preambles are necessary (when MCS changes) and when they can be omitted (when MCS remains the same), optimizing the balance between transmission adaptability and overhead reduction.