FREQUENCY CORRECTION CIRCUIT, RADIO RECEIVING APPARATUS, AND FREQUENCY CORRECTION METHOD

摘要

A frequency correction circuit used in a radio receiving apparatus that receives a preamble signal through one frequency band and also detects a periodic symbol timing in a receiving period of a part of a symbol that composes the preamble signal, the frequency correction circuit includes a generating unit that generates a detection window of a predetermined time width including each of a first symbol timing and a second symbol timing in the receiving period of a remaining symbol that composes the preamble signal, the first and the second symbol timing being previously determined among periodic symbol timings, a detecting unit that sequentially receives a correlation value between the preamble signal and a reference signal and detects a maximum value from the correlation value input during a period when the detection window is opened, and a correction unit that corrects a frequency deviation of the one frequency band.

主权项

1. A frequency correction circuit used in a radio receiving apparatus that receives a preamble signal through one frequency band and further detects a periodic symbol timing in a receiving period of a part of a symbol that composes the preamble signal, the frequency correction circuit comprising:
a generating unit that generates a detection window of a predetermined time width including each of a first symbol timing and a second symbol timing in the receiving period of a remaining symbol that composes the preamble signal, the first symbol timing and the second symbol timing being previously determined among periodic symbol timings; a detecting unit that sequentially receives a correlation value between the preamble signal and a reference signal, and detects a maximum value from the correlation value input during a period when the detection window is opened; and a correction unit that corrects a frequency deviation of the one frequency band based on the maximum value.