Code division multiple access signal receiving apparatus

Claim 2

A code division multiple access signal receiving apparatus for demodulating transmit data by subjecting a receive signal to despread processing using a code sequence identical with a spreading-code sequence on a transmitting side, comprising: a cross-correlation detector for calculating a cross-correlation value per symbol between a spreading-code sequence for spread-spectrum modulating local-station-addressed transmit data and a spreading-code sequence for spread-spectrum modulating other-station-addressed transmit data; a comparator for comparing the cross-correlation value with a threshold value; a control signal output portion for outputting a control signal during a symbol interval when the cross-correlation value is larger than or equal to the threshold value; and a switch for halting passage of a portion of the receive signal that corresponds to said symbol interval during which the control signal is output or halting despread processing of a portion of the receive signal that corresponds to said symbol interval.

Claim 3

A code division multiple access signal receiving apparatus according to claim 1 , comprising: a despreader for subjecting the receive signal to despread processing using a code sequence identical with a spreading-code sequence on the transmitting side; and a decoder for decoding transmit data using a despread signal output from the despreader; said switch regarding the receive signal prior to despreading thereof or a despread signal as said receive signal, and halting passage of a portion of the despread signal that corresponds to all or a part of said spreading-code sequence.

Claim 4

A code division multiple access signal receiving apparatus according to claim 2 , comprising: a delay unit for delaying said code sequence for despread processing or despread signal for a prescribed period of time; said delay unit matching timing of the despread signal, which is input to said switch, to detection timing of the cross-correlation value by delay processing.

Claim 5

A code division multiple access signal receiving apparatus according to claim 1 , wherein said cross-correlation detector calculates the cross-correlation value between said spreading-code sequences in advance and saves the position of the spreading-code sequence discriminated to be an interference interval based upon the cross-correlation value; and said switch halts passage of a portion of the receive signal regarding all or part of a spreading-code sequence that conforms to the position saved.

Claim 6

A code division multiple access signal receiving apparatus according to claim 1 , wherein said switch outputs a signal of a predetermined level when blocking passage of part of the receive signal.

Claim 7

A code division multiple access signal receiving apparatus for demodulating transmit data by subjecting a receive signal to despread processing using a code sequence identical with a spreading-code sequence on a transmitting side, comprising: a cross-correlation detector for calculating a cross-correlation value per symbol between spread-spectrum modulated local-station-addressed transmit data and spread-spectrum modulated other-station-addressed transmit data; a comparator for comparing the cross-correlation value with a threshold value; a control signal output portion for outputting a control signal during a symbol interval when the cross-correlation value is larger than or equal to the threshold value; and a switch for halting passage of a portion of the receive signal that corresponds to said symbol interval dining which the control signal is output or halting despread processing of a portion of the receive signal that corresponds to said symbol interval.

Claim 8

A code division multiple access signal receiving apparatus for demodulating transmit data by subjecting a receive signal to despread processing using a code sequence identical with a spreading-code sequence on a transmitting side, comprising: a cross-correlation detector for calculating a cross-correlation value per symbol between spread-spectrum modulated local-station-addressed transmit data and spread-spectrum modulated other-station-addressed transmit data; a comparator for comparing the cross-correlation value with a threshold value; a control signal output portion for outputting a control signal during a symbol interval when the cross-correlation value is larger than or equal to the threshold value; and a switch for halting passage of a portion of the receive signal that corresponds to said symbol interval dining which the control signal is output or halting despread processing of a portion of the receive signal that corresponds to said symbol interval.

Claim 9

A code division multiple access signal receiving apparatus for demodulating transmit data by subjecting a receive signal to despread processing using a code sequence identical with a spreading-code sequence on a transmitting side, comprising: a cross-correlation detector for calculating a cross-correlation value per symbol between a first spreading-code sequence for spread-spectrum modulating local-station-addressed transmit data and a second spreading-code sequence for spread-spectrum modulating other-station-addressed transmit data; a comparator for comparing the cross-correlation value with a threshold value; a code-coincident-chip detector for detecting whether the values of the first and second spreading-code sequence coincide or not per chip; a control signal output portion for outputting a control signal during a chip interval when the values of the first and second spreading-code sequence coincide per chip and the cross-correlation value is larger than or equal to the threshold value; and a switch for halting passage of a portion of the receive signal that corresponds to said chip interval during which the control signal is output or halting despread processing of a portion of the receive signal that corresponds to said chip interval.

Claim 10

A code division multiple access signal receiving apparatus for demodulating transmit data by subjecting a receive signal to despread processing using a code sequence identical with a spreading-code sequence on a transmitting side, comprising: a cross-correlation detector for calculating a cross-correlation value per symbol between a first spreading-code sequence for spread-spectrum modulating local-station-addressed transmit data and a second spreading-code sequence for spread-spectrum modulating other-station-addressed transmit data; a comparator for comparing the cross-correlation value with a threshold value; a code-coincident-chip detector for detecting whether the values of the first and second spreading-code sequence coincide or not per chip; a control signal output portion for outputting a control signal during a chip interval when the values of the first and second spreading-code sequence coincide per chip and the cross-correlation value is larger than or equal to the threshold value; and a switch for halting passage of a portion of the receive signal that corresponds to said chip interval during which the control signal is output or halting despread processing of a portion of the receive signal that corresponds to said chip interval.

Claim 11

A code division multiple access signal receiving apparatus according to claim 7 comprising: a despreader for subjecting a receive signal to despread processing using a code sequence identical with the spreading-code sequence on the transmitting side; and a decoder for decoding transmit data using a despread signal output from the despreader; said switch regarding the receive signal prior to despreading thereof or the despread signal as said receive signal, and halting passage of a portion of the despread signal that corresponds to all or a part of said spreading-code sequence on the transmitting side.

Claim 12

A code division multiple access signal receiving apparatus according to claim 8 comprising: a delay unit for delaying said code sequence for despread processing or despread signal for a prescribed period of time; said delay unit matching timing of the despread signal, which is input to said switch, to detection timing of the cross-correlation value by delay processing.

Claim 13

A code division multiple access signal receiving apparatus according to claim 7 wherein said cross-correlation detector calculates the cross-correlation value between said spreading-code sequence in advance and saves the position of the spreading-code sequence discriminated to be an interference interval based upon the cross-correlation value; and said switch halts passage of a portion of the receive signal regarding all or part of the spreading-code sequence that conforms to the position saved.

Claim 14

A code division multiple access signal receiving apparatus according to claim 7 wherein said switch outputs a signal of a predetermined level when blocking passage of part of the receive signal.

Claim 15

A code division multiple access signal receiving apparatus comprising: a decoder for decoding transmit data; a despreader for subjecting a receive signal to despread processing; and a cross-correlation detector for calculating a cross-correlation value between a first spreading-code sequence for spread-spectrum modulating local-station-addressed transmit data and a second spreading-code sequence that differs from said first spreading-code sequence and for generating, based upon the result of the cross-correlation value, a control signal that prevents a portion of the result of the despread processing from inputting to said decoder.

Claim 16

A code division multiple access signal receiving apparatus comprising: a decoder for decoding transmit data; a despreader for subjecting a receive signal to despread processing; and a cross-correlation detector for calculating a cross-correlation value between a first spreading-code sequence for spread-spectrum modulating local-station-addressed transmit data and a second spreading-code sequence that differs from said first spreading-code sequence and for generating, based upon the result of the cross-correlation value, a control signal that prevents a portion of the result of the despread processing from inputting to said decoder.