Receiving method and receiver with high-precision signal estimation

Abstract

A phase rotation unit rotates the phase of a digital received signal in accordance with a correction signal from a correction determination unit. An FWT computation unit subjects a CCK modulated signal to FWT computation and outputs Walsh transform values FWT. A maximum value searching unit receives Walsh transform values FWT and selects one of them by referring to the magnitude thereof. In accordance with the selected Walsh transform value FWT, the maximum value searching unit outputs a φsignal and a φ component signal, the φsignal corresponding to the signal prior to φdifferential detection and the φ component signal being a combination of φthrough φ. A φdemodulation unit subjects the φsignal to differential detection so as to generate φ. A second phase error detection unitdetects a phase error in accordance with an output signal from the φdemodulation unit.