On the throughput gain of rapid symbol duration adaptation with dynamic spreading gain control

This thesis extends the study of the throughput gain of rapid duration adaptation to the cases in which, the symbol duration can only be chosen from a discrete finite set, the channel is varying during each symbol duration, and the duration adaption is implemented in a coded system. The results show that in uncoded systems the throughput gain is significant even within discrete duration sets and over channels varying during a symbol. In coded systems, the performance depends on the coding and interleaving scheme. For many commonly used codes without interleaving, symbol-by-symbol duration adaptation can also bring a large throughput gain. However, if the system adopts a superior forward error correction code, or a large size interleaver, there is little benefit to apply SBS duration adaptation. This thesis also illustrates how the throughput gain diminishes as the correlation between the available channel information and the true channel condition decreases.