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1. US20130028595 - Frequency offset estimating method and frequency offset estimating apparatus

官庁 アメリカ合衆国
出願番号 13640114
出願日 14.04.2011
公開番号 20130028595
公開日 31.01.2013
特許番号 08855485
特許付与日 07.10.2014
公報種別 B2
IPC
H 電気
04
電気通信技術
B
伝送
10
無線波以外の電磁波,例.赤外線,可視光または紫外線,を使用する,または微粒子放射線,例.量子通信,を使用する伝送方式
02
細部
08
監視,試験または障害測定のための装置
H 電気
04
電気通信技術
J
多重通信
11
直交多重化方式
H 電気
01
基本的電気素子
Q
空中線
17
空中線から放射された電波を吸収するための装置;輻射器または輻射系をもったそのような装置の組み合わせ
H 電気
04
電気通信技術
L
デジタル情報の伝送,例.電信通信
27
搬送波変調方式
26
多周波符号を用いる方式
H04B 10/08
H04J 11/00
H01Q 17/00
H04L 27/26
CPC
H04L 27/2657
H04L 27/2676
H04L 27/2684
出願人 Nakagawa Tadao
Nippon Telegraph and Telephone Corporation
Takatori Yasushi
Kudo Riichi
Matsui Munehiro
Ishihara Koichi
Kobayashi Takayuki
Yamazaki Etsushi
Sano Akihide
Yoshida Eiji
Mizoguchi Masato
Miyamoto Yutaka
発明者 Nakagawa Tadao
Takatori Yasushi
Kudo Riichi
Matsui Munehiro
Ishihara Koichi
Kobayashi Takayuki
Yamazaki Etsushi
Sano Akihide
Yoshida Eiji
Mizoguchi Masato
Miyamoto Yutaka
代理人 Harness, Dickey & Pierce, P.L.C.
優先権情報 2010-094968 16.04.2010 JP
発明の名称
(EN) Frequency offset estimating method and frequency offset estimating apparatus
要約
(EN)

When a circuit that calculates a frequency offset using a shape of a frequency spectrum is implemented by hardware, the circuit size can be reduced. A frequency offset estimating method for estimating the difference between a carrier frequency of a reception signal and the frequency of an output signal of a local oscillator includes performing a discrete Fourier transform on a reception signal previously sampled at a predetermined sampling frequency and outputting a frequency spectrum with a plurality of frequency components, calculating an average power of the frequency spectrum, calculating a threshold by adding a predetermined value to the average power or power obtained by multiplying the average power by a constant, performing 1-bit quantization on powers of the frequency components of the frequency spectrum based on the threshold, and calculating a centroid frequency by multiplying frequencies of the frequency components by powers of 1-bit quantized frequency components, calculating the sum of multiplied products, and dividing the sum of the products by the sum of the powers of the 1-bit quantized frequency components of the frequency spectrum.