Correlator and synchronous tracking apparatus for a spread spectrum receiver using the same

Claim 2

A synchronous tracking apparatus of a spread spectrum receiver for receiving a signal in which data have been spread based on a pseudo-noise code for transmitting, comprising: a first correlation property wherein a signal in which data have been spread based on a pseudo-noise code for transmitting is received, the received signal and a pseudo-noise code for receiving are inputted and a correlation value obtained at a given segment of a 1-chip segment of the pseudo-noise code for receiving has a continuous maximum value; a second correlation property wherein a correlation value obtained at a segment remaining when the given segment is subtracted from the 1-chip segment has a continuous maximum value; a delay discriminating property obtained by subtracting the second correlation property from the first correlation property; and a means for controlling the frequency of the pseudo-noise code for receiving based on the delay discriminating property and synchronously tracking the pseudo-noise code for receiving with the pseudo-noise code for transmitting.

Claim 3

A synchronous tracking apparatus of a spread spectrum receiver for receiving a signal in which data have been spread based on a pseudo-noise code for transmitting, comprising: a first correlation property obtained by receiving a signal in which data have been spread based on a pseudo-noise code for transmitting, multiplying this received signal with a pseudo-noise code for receiving, phase-synchronizing with a pseudo-noise code for receiving and time-sharing and totalling data from this multiplied signal based on a first signal which repeats the H level and L level at 1-chip segments of the pseudo-noise code for receiving; a second correlation property obtained by time-sharing and totalling data based on a second signal which is inversely phased in relation to the first signal; and a delay discriminating property obtained by subtracting the second correlation property from the first correlation property; and a means for controlling the frequency of the pseudo-noise code for receiving based on the delay discriminating property and synchronously tracking the pseudo-noise code for receiving with the pseudo-noise code for transmitting.

Claim 4

A synchronous tracking apparatus of a spread spectrum receiver for receiving a signal in which data have been spread based on a pseudo-noise code for transmitting, comprising: a first data time-sharing means wherein, in addition to phase-synchronizing with a signal obtained by receiving a signal in which data have been spread based on a pseudo-noise code for transmitting and multiplying this received signal with a pseudo-noise code for receiving, data is time-shared based on a first signal which repeats outputting at the H level and L level at 1-chip segments of the pseudo-noise code for receiving; a first correlation property obtained from a first integrator which integrates a signal outputted from the first data time-sharing means; a second data time-sharing means for time-sharing data based on a second signal which is inversely phased in relation to the first signal; a second correlation property obtained from a second integrator which integrates a signal outputted from the second data time-sharing means; a delay discriminating property obtained from a calculator which subtracts the second correlation property from the first correlation property; and a means for controlling the frequency of the pseudo-noise code for receiving based on the delay discriminating property and synchronously tracking the pseudo-noise code for receiving with the pseudo-noise code for transmitting.

Claim 5

A synchronous tracking apparatus of a spread spectrum receiver for receiving a signal in which data have been spread based on a pseudo-noise code for transmitting, comprising: a first data time-sharing means wherein, in addition to phase-synchronizing with a signal obtained by receiving a signal in which data have been spread based on a pseudo-noise code for transmitting and multiplying this received signal with a pseudo-noise code for receiving, data is time-shared based on a first signal which repeats outputting at the H level and L level at 1-chip segments of the pseudo-noise code for receiving; a second data time-sharing means for time-sharing data based on a second signal which is inversely phased in relation to the first signal and obtaining a second data time-sharing signal; a delay discriminating property obtained by subtracting the second data time-sharing signal from the first data time-sharing signal; and a means for controlling the frequency of the pseudo-noise code for receiving based on the delay discriminating property and synchronously tracking the pseudo-noise code for receiving with the pseudo-noise code for transmitting.

Claim 6

A synchronous tracking apparatus of a spread spectrum receiver for receiving a signal in which data have been spread based on a pseudo-noise code for transmitting, comprising: a first data time-sharing means wherein, in addition to phase-synchronizing with a signal obtained by receiving a signal in which data have been spread based on a pseudo-noise code for transmitting and multiplying this received signal with a pseudo-noise code for receiving, data is time-shared based on a first signal which repeats outputting at the H level and L level at 1-chip segments of the pseudo-noise code for receiving; a second data time-sharing means for time-sharing data based on a second signal which is inversely phased in relation to the first signal and obtaining a second data time-sharing signal; a calculating means for subtracting an output signal of the second data time-sharing means from an output signal of the first time-sharing means; an integrating means for integrating an signal outputted from the calculating means; and a means for obtaining a delay discriminating property from a signal outputted from the integrator, controlling the frequency of the pseudo-noise code for receiving based on the delay discriminating property and synchronously tracking the pseudo-noise code for receiving with the pseudo-noise code for transmitting.

Claim 7

A synchronous tracking apparatus of a spread spectrum receiver according to any one of claims 3-6, wherein both the first and second signals are clock signals for generating pseudo-noise codes for receiving and are inversely phased.

Claim 8

A synchronous tracking apparatus of a spread spectrum receiver according to any one of claims 1-7, wherein a pseudo-noise code for receiving is created by inputting a clock signal to a linear feedback resistor.

Claim 9

A synchronous tracking apparatus of a spread spectrum receiver according to any one of claims 4, 6-8, wherein both first and second data time-sharing means are comprised of logical OR.

Claim 10

A synchronous tracking apparatus of a spread spectrum receiver according to any one of claims 4, 6-8, wherein both a first data time-sharing means and a second data time-sharer are comprised of logical AND.

Claim 11

A synchronous tracking apparatus of a spread spectrum receiver for receiving a signal in which data have been spread based on a pseudo-noise code for transmitting, wherein said apparatus; creates two correlation properties from a multiplication result obtained by multiplying the receive signal by a pseudo-noise code for receiving, wherein the two correlation properties are asymmetrical on both sides to a correlation value axis which no longer has a phase difference between a pseudo-noise code for transmitting and a pseudo-noise code for receiving included in the receive signal due to the manner of data time division in which data are shared over the same time axis; and creates a delay discriminating property by combining both the correlation properties.

Claim 12

A correlator, wherein said correlator uses a time-sharing means to time-share data and thereby obtains a self-correlation property asymmetrical to a vibration axis in which τ = 0 from a self-correlation property symmetrical to a vibration axis in which τ = 0 obtained from a calculating means for calculating a first signal and a second signal having as a function a parameter τ expressing the shift of one signal to another signal.

Claim 13

A correlator, wherein said correlator uses a time-sharing means to time-share data and thereby obtains a self-correlation property asymmetrical to a vibration axis in which τ = 0 from a self-correlation property symmetrical to a vibration axis in which τ = 0 derived by substituting a first signal f1(t) and a second signal f2(t) having as a function a parameter τ expressing the shift of one signal to another signal in a calculation equation

Claim 14

A correlator, wherein said correlator uses a data time-sharing means to time-share data from an input signal of a first signal and a second signal inputted thereto having as a function a parameter τ expressing the shift of one signal to another signal; and thereby deems a self-correlation property obtained wherein the first and second signals are identical to be an asymmetrical property with respect to a vibration axis in which τ = 0.

Claim 15

A correlator, wherein said correlator multiplies a first signal and a second signal inputted thereto having as a function a parameter τ expressing the shift of one signal to another signal, time-shares data using a time-sharing means, carries out integration and thereby deems a self-correlation property obtained wherein the first and second signals are identical to be an asymmetrical property with respect to a vibration axis in which τ = 0.

Claim 16

A correlator, wherein said correlator multiplies a first signal and a second signal inputted thereto having as a function a parameter τ expressing the shift of one signal to another signal, performs a logic operation with the multiplication result and a third signal phase-synchronized to either the first signal or the second signal, carries out integration and thereby deems a self-correlation property obtained wherein the first and second signals are identical to be an asymmetrical property with respect to a vibration axis in which τ = 0.

Claim 17

A correlator, wherein said correlator multiplies a first signal and a second signal inputted thereto having as a function a parameter τ expressing the shift of one signal to another signal, performs a logic operation with the multiplication result and a clock signal phase-synchronized to either the first signal or the second signal, carries out integration and thereby deems a self-correlation property obtained wherein the first and second signals are identical to be an asymmetrical property with respect to a vibration axis in which τ = 0.

Claim 18

A correlator, wherein said correlator multiplies a first signal and a second signal, time-shares data from a signal phase-synchronized to either the first signal or the second signal using a time-sharing means, integrates the signal in which data has been time-shared and thereby obtains a correlation property of the first and second signals.

Claim 19

A correlator according to any one of claims 12-18, wherein first and second signals are pseudo-noise codes.

Claim 20

A correlator according to any one of claims 12-18, wherein first and second signals are pseudo-noise codes obtained by inputting clock signals to a linear feedback resistor.

Claim 21

A correlator according to any one of claims 12-15, 18-20, wherein an OR logic calculator is used in a data time-sharing means.

Claim 22

A correlator according to any one of claims 16, 17, 19, 20, wherein logic calculation is OR logic.

Claim 23

A correlator according to any one of claims 12-15, 18-20, wherein a NAND logic calculator is used in a data time-sharing means.

Claim 24

A correlator according to any one of claims 16, 17, 19, 20, wherein logic calculation is NAND logic.

Claim 25

A correlator according to any one of claims 15-24, wherein multiplication is logical XOR.

Claim 26

A correlator, wherein said correlator sets a given function, carries out a multiplication calculation with an inputted signal, time-shares and integrates data from the multiplication result and thereby deems a self-correlation property obtained wherein a signal set in a given function and an inputted signal are identical to be an asymmetrical property with respect to a vibration axis in which τ = 0.

Claim 27

A spread spectrum receiver for receiving at a receiver a transmitted signal in which data have been spread-processed using a pseudo-noise code and carrying out reverse spread processing by multiplying the received signal by a pseudo-noise code with an identical phase and identical code as the pseudo-noise code, wherein: in order to reduce phase distortion of the data obtained by carrying out reverse spread processing, the spread spectrum receiver time-shares and integrates data from a multiplication result of a pseudo-noise code contained in a transmission signal and a pseudo-noise code used in reverse spread processing and thereby deems a self-correlation property of the pseudo-noise code contained in the transmission signal and the pseudo-noise code used in the reverse spread processing as an asymmetrical correlation property with respect to a same-phase correlation value axis, assesses the phase advance or delay from this asymmetry and phase-controls the pseudo-noise code used in reverse spread processing.

Claim 28

A correlator, wherein said correlator receives a video signal inputted thereto, measures a period constituting a given brightness signal level, produces a first timing signal which outputs High from the start of the measured period throughout the first half of the period and after this first half of the period has elapsed produces a second timing signal which is high during the second half of the measured period; and thereby deems a self-correlation property of a video signal obtained by time-sharing and integrating data from a multiplication of video signals differing temporally by one frame using the first timing signal and second timing signal as an asymmetrical correlation property with respect to a correlation value axis for video signals differing temporally by one frame having an identical signal and identical phase.