Patent ID: 8265126
Filing Date: 2012-09-11
Classification: H04B

Abstract:
1. A receiving device for spread spectrum communication and for receiving a signal spread and modulated with a first spreading code, the receiving device comprising: a phase determining unit calculating a cross correlation between the received signal and a second spreading code and determining a phase P(0) of the received signal based on the cross correlation, the phase P(0) being a synchronizing point with the first spreading code; and a data demodulating unit synchronizing the phase P(0) and the first spreading code and despreading and demodulating the received signal with the first spreading code, wherein: the number of components in each of the first spreading code and the second spreading code is defined as Y; Y is an integer greater than or equal to 2; the phase determining unit includes a cross-correlation calculating element; the cross correlation calculating element selects a combination of N phases from the received signal; the combination of N phases is defined as {P(x x a phase shifting difference between two of the phase shifting amounts is a predetermined number of chips; the cross-correlation calculating element calculates a product sum of the received signal for Y chips included in each of the N phases {P(x the combination of N cross-correlation values {Q(x the cross-correlation calculating element specifies the phase shifting amount x the cross-correlation calculating element determines the phase P(0) as a phase shifted by the phase shifting amount x N represents a predetermined integer that is less than Y and that is set so that the phase shifting amount x