US 7,072,384 B2 · Fixed pattern detection apparatus and fixed pattern detection method

Abstract

In a fixed pattern detection apparatus, a reception memory temporarily stores received signals. A correlator calculates signature pattern correlation values for respective blocks by product-sum operation based on received signals of the respective blocks obtained by dividing a received signal at a predetermined reference timing out of the received signals stored in the reception memory. An in-phase adder adds, in phase for a plurality of blocks, the in-phase components and quadrature components of the signature pattern correlation values obtained by the correlator. A power value calculation unit calculates individual power values from in-phase addition values obtained by the in-phase adder. An adder sums up the individual power values obtained by the power value calculation unit to calculate a detection power value corresponding to the received signal. A detection determination unit compares the detection power value obtained by the adder with a threshold to determine whether a fixed pattern has been detected. A fixed pattern detection method is also disclosed.

Claims19

Dependent claims

A fixed pattern detection apparatus which is used in a CDMA communication radio reception apparatus, and detects from a received signal a fixed pattern generated by spreading by a spreading code an in-phase component and a quadrature component of a pattern obtained by repeating a signature pattern formed from a plurality of symbols, comprising:

a reception memory which temporarily stores received signals;
correlation means for calculating signature pattern correlation values for respective blocks by product-sum operation based on received signals of the respective blocks obtained by dividing a received signal at a predetermined reference timing out of the received signals stored in said reception memory;
in-phase addition means for adding, in phase for a plurality of blocks, in-phase components and quadrature components of the signature pattern correlation values obtained by said correlation means;
power value calculation means for calculating individual power values from in-phase addition values obtained by said in-phase addition means;
addition means for summing up the individual power values obtained by said power value calculation means to calculate a detection power value corresponding to the received signal;
and
detection determination means for comparing the detection power value obtained by said addition means with a threshold to determine whether a fixed pattern has been detected.

4 more elements

A fixed pattern detection method which is used in a CDMA communication radio reception apparatus to detect from a received signal a fixed pattern generated by spreading by a spreading code an in-phase component and a quadrature component of a pattern obtained by repeating a signature pattern formed from a plurality of symbols, comprising the steps of:

temporarily storing received signals;
calculating signature pattern correlation values for respective blocks by product-sum operation based on received signals of the respective blocks obtained by dividing a received signal at a predetermined reference timing out of the stored received signals;
adding, in phase for a plurality of blocks, in-phase components and quadrature components of the obtained signature pattern correlation values;
calculating individual power values from obtained in-phase addition values;
summing up the obtained individual power values to calculate a detection power value corresponding to the received signal;
and
comparing the obtained detection power value with a threshold to determine whether a fixed pattern has been detected.

4 more elements

Dependencies are inferred from the claim text.

Fixed pattern detection apparatus and fixed pattern detection method

Life of this patent

Fixed pattern detection apparatus and fixed pattern detection method

Life of this patent

Abstract

Claims19