Title:
【発明の名称】搬送波形式のデータ伝送により送信された2次元データシンボルの復調回路
Document Type and Number:
Japanese Patent JP2002502142
Kind Code:
A
Abstract:
A circuit for demodulating two-dimensional data symbols transmitted by carrier-based data transmission. The circuit has a tuner and a quadrature demodulator. The tuner has a first intermediate frequency stage for converting a carrier frequency of an input signal containing the two-dimensional data symbols to a first intermediate frequency f1, a surface wave filter, and a second intermediate frequency stage connected downstream of the surface wave filter for converting the carrier frequency of the input signal to a second intermediate frequency f2. The second intermediate frequency f2 is lower than the first intermediate frequency f1. The demodulator converts the input signal at the second carrier intermediate frequency f2 to a baseband and splits it into in-phase and quadrature components. The quadrature demodulator contains an A/D converter with a prescribed sampling frequency fa, and an anti-alias filter is connected upstream of the A/D converter in order to remove interfering spectral components from the useful signal. The following relationship between the first and second intermediate frequencies f1, f2 and the sampling frequency fa are defined by the equations:
Inventors:
Peter Schelhorn
Application Number:
JP2000529046A
Publication Date:
January 22, 2002
Filing Date:
January 20, 1999
Export Citation:
Assignee:
Infineon Technologies Actien Gezel Shaft
International Classes:
H03D7/16; H04B1/26; H04L27/22; H04L27/38; (IPC1-7): H04L27/38; H04B1/26; H04L27/22
Attorney, Agent or Firm:
Toshio Yano (4 outside)