Single-Carrier Receiver Decimation Phase Selection for Symbol Detection

The patent changes the parameter of sampling frequency representation by introducing an oversampling factor L, transforming the original sampling frequency fs into L×fs. This parameter transformation enables the use of FFT algorithms even when the original sampling frequency is not a power of two, thereby improving processing efficiency while avoiding the hardware complexity of implementing FFT with non-power-of-two frequencies.

The patent applies preliminary action by performing phase optimization before the decimation process. The system evaluates multiple candidate phases and selects the optimal phase that minimizes signal degradation before actually performing the decimation operation. This preliminary phase selection ensures that when decimation is performed to improve processing speed, the signal quality is preserved by avoiding frequency gaps through proper phase alignment.

The patent applies partial action by evaluating only a limited set of candidate phases (typically L phases where L is the oversampling factor) rather than exhaustively searching all possible phases. This partial evaluation approach achieves sufficient symbol detection accuracy by considering the most relevant phases while avoiding the excessive computational complexity of a complete phase search, thus finding an optimal balance between detection performance and computational load.