Patent Number: 7,046,743

Title: Demodulator for demodulating digital modulated signals

Abstract: A differential detector produces, for each symbol, a phase difference between received phase information and one-symbol-delayed phase information, and delivers the phase difference to a differential circuit and a phase corrector. Another differential detector produces, for each symbol, a phase difference between the one-symbol-delayed phase information and two-symbol-delayed phase information of the received phase information. The differential circuit produces, for each symbol, phase-difference difference information from a difference between both the phase differences. A phase error detector obtains a phase error caused by a difference in the carrier frequency between a sending and a receiving digital radio apparatus, based on the phase-difference difference information and either of both phase differences. A phase corrector subtracts the phase error from the phase difference.

Inventors: Akahori; Hiroji (Tokyo, JP)

Assignee: Oki Electric Industry Co., Ltd.

International Classification: H03D 3/22 (20060101); H04L 27/14 (20060101)

Expiration Date: 5/16/02018