US 6,587,523 B1 · Radio signal receiving apparatus and a method of radio signal reception

Abstract

A radio signal receiving apparatus and a method of radio signal receiving for improving the receiving characteristic by limit the excessive compensation in the AFC circuit are realized. The base band phasing signal output from the phase detector is input to the AFC unit. In the AFC unit, the base band phasing signal is supplied to two ways, one is supplied to a series processing path of the frequency error detecting part, the integrating equalizing part, the numerical limiting part and the integrator, and another is supplied to the adder. In the former case, the frequency error of the base band phasing signal supplied to the frequency detecting part is detected, the detected frequency error is integrated and equalized for every one symbol in the integrating equalizing part and, after that, the equalized frequency error value is limited within a predetermined range in the numerical limiting part, and finally, the frequency error limited by the numerical limiting part is integrated for every one symbol in the integrator. The integrated frequency error is subtracted from the original base band phasing signal, which is the signal of the latter case, by the adder.

Claims6

Dependent claims

A radio signal receiving apparatus comprising:

an automatic frequency controller unit for compensating for a frequency error between a frequency used for signal modulation and a frequency to be used for signal demodulation by detecting the frequency error from a modulated signal and limiting the detected frequency error within a predetermined range;
and
a phase detector for converting the modulated signal into a base band phasing signal, wherein the automatic frequency controller unit detects the frequency error from the base band phasing signal,
the automatic frequency controller unit comprising:
a frequency error detecting part for detecting the frequency error from the base band phasing signal after being converted from the modulated signal by the phase detector;
an integrating and equalizing part for integrating and equalizing the frequency error detected by the frequency error detecting part;
and
a numerical limiting part for limiting the frequency error integrated and equalized by the integrating and equalizing part within the predetermined range.

5 more elements

Dependencies are inferred from the claim text.

Radio signal receiving apparatus and a method of radio signal reception

Life of this patent

Radio signal receiving apparatus and a method of radio signal reception

Life of this patent

Abstract

Claims6