JP2001102963A - Device and method for synchronization - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect the reception timing of a received signal even if the received signal is affected by a delay wave or an abrupt deterioration in reception quality. SOLUTION: An AGC circuit 101 corrects the gain of a received signal, an A/D converter 102 converts the gain-corrected signal from analog to digital, and a reception window control circuit 105 indicates the start of detection of the reception timing, a correlator 109 finds the correlation value between the ADD-converted signal and a known pattern signal, a power detecting circuit 110 detects the power of the correlation value, and a correlation value power scaler 111 multiplies the correlation value power by a scaling coefficient which corresponds to the correction value of the mentioned gain and cancels the gain. Then a differential absolute value output unit 112 differentiates the coefficient multiplied power by arbitrary samples and outputs the absolute value of the differentiation result, a maximum retrieval unit 115 retrieves a maximum value at the absolute value from the point of time of the detection start, and a latch circuit 116 holds the maximum value and the order of the sample.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronizing apparatus and a synchronizing method used for a mobile station apparatus and a base station apparatus in a mobile communication system to which a CDMA system is applied, and for synchronizing both apparatuses.

[0002]

2. Description of the Related Art Conventionally, as this kind of synchronization device and synchronization method, there is one described in Japanese Patent Application No. 6-270180.

FIG. 8 is a block diagram showing a configuration of a conventional synchronizer.

The synchronizer shown in FIG. 8 uses an AGC (Automated
atic Gain Control) circuit 801 and A / D converter 802
, A correlation circuit 803, and a reception timing detection circuit 804
And a reception window control circuit 815. The correlation circuit 803 includes memories 805 and 806 and a correlator 807.
And a power detection circuit 808. The reception timing detection circuit 804 includes a switch 809, a comparator 810,
The receiving window control circuit 805 includes a memory 811 and a latch circuit 812. The receiving window control circuit 805 includes a counter 813 and a decoder 814.

In such a configuration, a radio signal (not shown) is received by a radio (not shown), and the received analog signals of I and Qch are suitable for the input signal level of A / D converter 802 in AGC circuit 801. After the signal level has been corrected, the A / D converter 802 performs A / D conversion and quantization.

The reception window control circuit 815 controls the values of the counter 813 and the decoder 814 to appropriate values in order to detect a reception timing at an arbitrary position in a specific repetition timing such as a symbol or a frame. The timing detection start is transmitted to the correlation circuit 803 and the reception timing detection circuit 804.

When the start of the reception timing detection is transmitted, the reception timing detection circuit 804 switches the switch 809
Close. Hereinafter, the operation after the reception timing detection is started will be described.

In the correlation circuit 803, the correlation value power is obtained as follows. The quantized result is stored in the memory 8
05 is input. At this time, the memory 805 stores the known number (M) of received signals and overwrites the oldest received signal with the new received signal.

[0009] The memory 806 stores a received waveform of a known pattern. Correlator 807 includes memories 805 and 8
06 and the correlation value of the received signal. Actually, the correlation values of the in-phase component and the quadrature component are obtained as in the following equations (1) and (2), and then the powers of the in-phase component and the quadrature component are obtained as in the equation (3). Here, the subscript I represents an in-phase component and Q represents a quadrature component. These equations (1) to (3)
Can be easily realized by software of a signal processor such as a DSP (Digital Signal Processor).

[0010]

(Equation 1)

(Equation 2)

(Equation 3) After the power of the correlation value (correlation value power signal) is detected by the power detection circuit 808, the correlation value power signal is stored at a certain value (here, memory) while the switch 809 is closed, that is, during the reception timing detection section. The value stored in the comparator 811 is compared with the comparator 810 to detect the optimum timing by detecting the maximum value in a certain time interval or in a certain section, and store it in the latch circuit 812.

[0011]

However, in a conventional apparatus, a received wave reflected by a building or a mountain and the like (this wave is called a delayed wave. On the other hand, a desired received signal is a desired wave or a preceding wave) ), Or when the reception quality suddenly falls into an extremely bad state due to Rayleigh fading or the like, it is difficult to obtain an accurate reception timing due to the influence of these delayed waves or the rapid deterioration of the reception quality. There is a problem that is.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a synchronizing apparatus and a synchronizing apparatus capable of accurately detecting a reception timing even when a received signal is affected by a delayed wave or a sudden deterioration of reception quality. The aim is to provide a method.

[0013]

A synchronizer according to the present invention comprises: a gain correcting means for correcting a gain of a received signal; an A / D converting means for A / D converting the gain-corrected signal;
Reception window control means for instructing start of detection of the reception timing of the reception signal, correlation means for obtaining a correlation value between the A / D converted signal and a known signal, and power detection means for detecting the power of the correlation value And a first correction amount for canceling a change in gain according to the correction value of the gain.
Scaling means for correcting the power with a correction amount, differential absolute value output means for differentiating the corrected power between arbitrary samples, and outputting an absolute value of the differentiation result, and the absolute value output from the detection start time of the reception timing. The maximum value searching means for searching for the maximum value among the values, and a holding means for holding the searched maximum value and the order of the sample of the maximum value are adopted.

According to this configuration, even when the gain of the received signal is greatly corrected during the detection of the reception timing, it is possible to correctly capture the change in the correlation value with the known signal for detecting the corrected received signal. Therefore, the reception timing can be accurately detected.

[0015] The synchronization device according to the present invention, in the above configuration,
A reception quality measurement unit that obtains reception quality from the correlation value obtained by the correlation unit; and the scaling unit cancels a change due to the reception quality instead of correcting the power of the correlation value with a first correction amount. The second correction amount is obtained, and the power of the correlation value is corrected by the second correction amount.

According to this configuration, even if the received signal quality greatly changes during the detection of the reception timing, it is possible to correctly grasp the change in the correlation value with the known signal for detecting the received signal at the time of the change. Therefore, the reception timing can be accurately detected.

[0017] The synchronizing device according to the present invention, in the above configuration,
A reception quality measurement unit for obtaining reception quality from the correlation value obtained by the correlation unit; and a scaling coefficient control unit for obtaining a change in gain according to the correction value of the gain and a third correction amount for canceling the change due to the reception quality. And a scaling unit that corrects the power of the correlation value with the third correction amount instead of correcting the power of the correlation value with the first correction amount.

According to this configuration, even if the gain of the received signal is greatly corrected during the detection of the reception timing and the quality of the received signal is greatly changed, the correction and detection of the received signal at the time of the change are performed. Since the change in the correlation value with the known signal can be correctly detected, the reception timing can be accurately detected.

The synchronizer according to the present invention comprises: a gain correcting means for correcting a gain of a received signal; an A / D converting means for A / D converting the gain-corrected signal; and a detection start of reception timing of the received signal. Receiving window control means for instructing
Correlation means for obtaining a correlation value between the A / D-converted signal and the known signal; power detection means for detecting the power of the correlation value; and differentiation of the detected power between arbitrary samples. Differential absolute value output means for outputting an absolute value; sample unit averaging means for obtaining an average value of the absolute values of the same sample counted from the detection start time of the reception timing in current and previous reception timing detection; and Storage means for storing a value as an absolute value in the previous reception timing detection; maximum value search means for searching for the maximum value in the average value from the detection start time of the reception timing; the searched maximum value and the maximum value Holding means for holding the order of value samples.

According to this configuration, even if the reception signal cannot be detected due to fading fluctuation during the detection of the current reception timing, the timing can be complemented from the past information. Can be accurately detected.

[0021] The synchronization device of the present invention has the above configuration,
A first correction amount for canceling a change in gain according to the correction value of the gain is obtained between the power detection unit and the differential absolute value output unit, and the power of the correlation value is obtained from the power detection unit using the first correction amount. Is connected, and the differential absolute value output means differentiates the corrected power between arbitrary samples and outputs the absolute value of the differential result.

According to this configuration, if the received signal is greatly corrected by the gain correction circuit during the detection of the current reception timing, even if the received signal cannot be detected due to fading fluctuation or the like. Since the timing can be complemented from the past information, the reception timing can be accurately detected.

[0023] The synchronizing apparatus of the present invention has the above configuration,
A reception quality measurement unit that obtains reception quality from the correlation value obtained by the correlation unit; and the scaling unit cancels a change due to the reception quality instead of correcting the power of the correlation value with a first correction amount. The second correction amount is obtained, and the power of the correlation value is corrected by the second correction amount.

According to this configuration, if the reception quality greatly changes during the current reception timing detection, even if the received signal cannot be detected due to fading fluctuations or the like, even if the received signal cannot be detected, the past information is not used. Since the timing can be complemented, the reception timing can be accurately detected.

[0025] The synchronizing apparatus of the present invention has the above configuration,
A reception quality measurement unit for obtaining reception quality from the correlation value obtained by the correlation unit; and a scaling coefficient control unit for obtaining a change in gain according to the correction value of the gain and a third correction amount for canceling the change due to the reception quality. And a scaling unit that corrects the power of the correlation value with the third correction amount instead of correcting the power of the correlation value with the first correction amount.

According to this configuration, when the reception signal is greatly corrected by the gain correction circuit and the reception quality greatly changes during the current reception timing detection, the reception signal cannot be detected due to fading fluctuation or the like. Even in such a state, the timing can be complemented from the past information, so that the reception timing can be accurately detected.

[0027] The mobile station apparatus of the present invention employs a configuration including a synchronization device similar to any of the above configurations.

According to this configuration, in the mobile station device,
The same operation and effect as those of any of the above configurations can be obtained.

The base station apparatus according to the present invention employs a configuration including a synchronization device similar to any one of the above configurations.

According to this configuration, in the base station apparatus,
The same operation and effect as those of any of the above configurations can be obtained.

The mobile communication system of the present invention employs a configuration including a mobile station apparatus or a base station apparatus similar to any one of the above configurations.

According to this configuration, in the mobile communication system, the same operation and effect as any of the above configurations can be obtained.

According to the synchronization method of the present invention, the gain of a received signal is corrected, the gain-corrected signal is A / D-converted, and a correlation value between the A / D-converted signal and a known signal is obtained.
The power of the correlation value is detected, a first correction amount for canceling a change in gain according to the correction value of the gain is obtained, the power is corrected by the first correction amount, and the corrected power is sampled as an arbitrary sample. The maximum value in the absolute value of the differentiation result is searched for, and the searched maximum value and the order of the sample of the maximum value are retained.

According to this method, even if the gain of the received signal is largely corrected during the detection of the reception timing, it is possible to correctly capture the change in the correlation value with the known signal for detecting the corrected received signal. Therefore, the reception timing can be accurately detected.

According to the synchronization method of the present invention, the gain of a received signal is corrected, the gain-corrected signal is A / D-converted, and a correlation value between the A / D-converted signal and a known signal is obtained.
The power of the correlation value is detected, the detected power is differentiated between arbitrary samples, the absolute value of the result of the differentiation is output, and the absolute value of the sample at the same detection time in the present and previous reception timing detections is compared. An average value is obtained, the average value is stored as an absolute value in the previous reception timing detection, the maximum value in the average value is searched, and the searched maximum value and the sample order of the maximum value are held. I did it.

According to this method, even if the received signal cannot be detected due to fading fluctuation or the like during the detection of the current reception timing, the timing can be complemented from the past information. Can be accurately detected.

[0037]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a synchronizer according to Embodiment 1 of the present invention.

The synchronization device 1 according to the first embodiment shown in FIG.
00 is used for a mobile station apparatus or a base station apparatus in a mobile communication system to which the CDMA system is applied, for example, and synchronizes with a received signal from a communication partner apparatus.
GC circuit 101, A / D converter 102, correlation circuit 1
03, a correlation emphasis circuit 104, and a reception window control circuit 105
And a reception timing detection circuit 106.

The correlation circuit 103 includes a memory 107,
108, a correlator 109, and a power detection circuit 110, and the correlation emphasis circuit 104 includes a correlation value power scaler 1
11 and correlation value power sample differential absolute value output device 112
The reception window control circuit 105 includes a counter 113 and a decoder 114, and the reception timing detection circuit 106
Comprises a maximum value searcher 115 and a latch circuit 116.

In such a configuration, a radio signal is received by a radio device (not shown), and the received analog signals of I and Qch are suitable for the input signal level of A / D converter 802 in AGC circuit 801. After the signal level is corrected to the adjusted signal level, the signal is A / D-converted by the A / D converter 802 and output to the correlation circuit 103.

In the receiving window control circuit 105, the counter 113 counts up every time an external clock is supplied. When the counter value becomes a value set from outside by the decoder 114, the reception timing detection starts. Is output to the correlation circuit 103, the correlation emphasis circuit 104, and the reception timing detection circuit 106.

Upon receiving the reception timing detection start signal, the correlation circuit 103 stores the data after the A / D conversion in the memory 107.
The stored data and a known data string stored in the memory 108 are compared by a correlator 109 to obtain a correlation value between the two data. The power of the correlation value is calculated by a power detection circuit 110 And the correlation value power signal is output to the correlation emphasis circuit 104.

In the correlation emphasizing circuit 104, the correlation value power scaler 111 uses a scaling coefficient corresponding to the gain correction value from the AGC circuit 101 (in this case, a coefficient for canceling a change in gain according to the gain correction value). )
Is calculated, and the scaling coefficient is multiplied by the correlation value power signal from the power detection circuit 110 to perform scaling.

That is, this scaling means that when the gain of the received signal is corrected in the AGC circuit 101,
Since the amplitude of the received signal after the correction is different from the amplitude of the received signal before the correction, the gain is canceled by the scaling coefficient to return the amplitude to the amplitude of the received signal input to the AGC circuit 101. .

By this scaling, the change in the correlation value power corresponding to the change in the gain correction value after the start of the reception timing detection is accurately emphasized.

Correlation value power sample differential absolute value output device 1
At 12, the correlation value power signal scaled by the correlation value power scaler 111 is handled in units of samples, such as 1, 2,..., N, from the reception timing detection start instruction. Is differentiated. In this differentiation, for example, the degree of change between sample 1 and sample 2 is obtained, and the absolute value (differential absolute value signal) is obtained.

This differential absolute value signal responds sensitively to the change in the absolute value of the correlation value power, and captures the change point of the correlation value power buried in the noise in the sample sequence of the correlation value power signal. This emphasizes the reception timing.

Correlation value power sample differential absolute value output device 1
The differential absolute value signal from 12 is output to the reception timing detection circuit 106.

In the reception timing detection circuit 106, after an instruction to start detection of reception timing from the reception window control circuit 105, the maximum value search unit 115 determines which sample in the differential absolute value signal from the correlation emphasis circuit 104 is the maximum value. , And the searched maximum value and the order of the samples are output to the latch circuit 116 and held. In the subsequent stage, demodulation is performed at the reception timing corresponding to the sample order of the held maximum value.

As described above, the synchronization device 10 according to the first embodiment
According to 0, even if a delayed wave arrives or the reception quality sharply deteriorates during the detection of the reception timing, and the reception signal is greatly corrected by the AGC circuit (gain correction means) 101 due to these effects, Since the change in the correlation value with the known signal for detecting the corrected received signal can be correctly detected, the reception timing can be accurately detected.

(Embodiment 2) FIG. 2 is a block diagram showing a configuration of a synchronizer according to Embodiment 2 of the present invention.
However, in the second embodiment shown in FIG. 2, portions corresponding to the respective portions of the first embodiment in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The synchronization device 2 according to the second embodiment shown in FIG.
00 is different from the first embodiment in that
01.

The reception quality measuring device 201 measures the reception quality of the signal output from the correlator 109 and outputs it to the correlation value power scaler 111.

However, the reception quality is obtained from, for example, the variance of the output signal symbol vector of the correlator 109 and the rotation angle between the output symbol symbols that differ in time.

Therefore, in the correlation value power scaler 111, a scaling coefficient corresponding to the reception quality (in this case, a coefficient for canceling a change due to the reception quality) is obtained.
The scaling by which the correlation value power signal from 10 is multiplied is performed.

By this scaling, a change in the correlation value power corresponding to a change in the reception quality after the start of the detection of the reception timing is accurately emphasized. Thereafter, the same processing as that described in the first embodiment is performed.

As described above, the synchronization device 20 according to the second embodiment
According to 0, even if a delayed wave arrives or the reception quality sharply deteriorates during the detection of the reception timing, and the reception signal quality greatly changes due to these effects, the reception signal at the time of the change is detected. Therefore, the change of the correlation value with the known signal can be correctly detected, so that the reception timing can be accurately detected.

(Embodiment 3) FIG.3 is a block diagram showing a configuration of a synchronizer according to Embodiment 3 of the present invention.
However, in the third embodiment shown in FIG. 3, portions corresponding to the respective portions of the second embodiment in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.

The synchronization device 3 according to the third embodiment shown in FIG.
00 is different from the second embodiment in that a scaling coefficient controller 301 is provided.

The scaling coefficient controller 301 has an AGC
Gain correction value and reception quality measuring device 20 from circuit 101
A scaling coefficient to be multiplied by the correlation value power signal from the power detection circuit 110 is obtained based on the reception quality from 1.
It is output to the correlation value power scaler 111.

The scaling coefficient in this case is a coefficient for canceling a change in gain according to the gain correction value and canceling a change due to reception quality. For example, the scaling coefficient is multiplied by a constant multiplier. Then, the reception quality is obtained by multiplying the reception quality by a constant multiplier and adding the multiplication results of both.

The correlation value power scaler 111 performs scaling in which the scaling coefficient is multiplied by the correlation value power signal.

By this scaling, a change in the gain correction value and a change in the correlation value power corresponding to a change in the reception quality after the start of the reception timing detection are accurately emphasized. Thereafter, the same processing as that described in the first embodiment is performed.

As described above, the synchronization device 30 according to the third embodiment
According to 0, a delayed wave arrives or a sudden deterioration of reception quality occurs during the detection of reception timing, and the reception signal is greatly corrected by the AGC circuit 101 due to these influences. Even if changes greatly,
Since the correction and the change of the correlation value with the known signal for detecting the received signal at the time of the change can be correctly captured,
The reception timing can be accurately detected.

(Embodiment 4) FIG. 4 is a block diagram showing a configuration of a synchronizer according to Embodiment 4 of the present invention.
However, in the fourth embodiment shown in FIG. 4, portions corresponding to the respective portions of the first embodiment in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The synchronization device 4 according to the fourth embodiment shown in FIG.
00 is different from the first embodiment in that the correlation emphasis circuit 10
4 is a correlation value power sample differential absolute value output device 112
And a sample unit averaging circuit 401 and a memory 402.

In this case, in the correlation value power sample differential absolute value output unit 112, the correlation value power signal from the power detection circuit 110 is output from the reception timing detection start instruction.
It is treated in sample units such as 1, 2, ..., N,
The correlation value power signal is differentiated for each sample unit.
In this differentiation, for example, the degree of change between sample 1 and sample 2 is obtained, and the absolute value (differential absolute value signal) is obtained.

This differential absolute value signal responds sensitively to the change in the absolute value of the correlation value power, and captures the change point of the correlation value power buried in the noise in the sample sequence of the correlation value power signal, thereby obtaining a precise value. This emphasizes the reception timing.

The sample unit averaging circuit 401 calculates the long-term average of the differential absolute value signal from the correlation value power sample differential absolute value output unit 112 and the average value stored in the memory 402 up to the previous reception timing detection. Ask.

The method for obtaining the long-term average value can be, for example, the following method. The sample sequence of the differential absolute value signal this time is b1, b2, b3,..., BN, and the sample sequence of the average value up to the previous time is c1, c2, c3,.
As cN, aN = α · bN + β · cN is calculated.

Here, β is a number close to 1, for example, 0.99
Where α is 1−β and aN is a value represented as the output of the forgetting coefficient filter. This aN is used as the long-term average value.

The value obtained by taking a long-term average of the current value and the previous value is stored in the memory 402 and output to the maximum value search unit 115.

After the reception window control circuit 105 instructs the start of the detection of the reception timing, the maximum value search unit 115 searches the memory 402 for the sample of the long-term average value which is the maximum value. The maximum value and the order of the samples are output to the latch circuit 116 and held.

As described above, the synchronization device 40 according to the fourth embodiment
According to 0, even if the received signal cannot be detected due to fading fluctuation etc. during detection of the current reception timing, the timing can be complemented from the past information, so that the reception timing can be accurately detected. can do.

(Embodiment 5) FIG.5 is a block diagram showing a configuration of a synchronizer according to Embodiment 5 of the present invention.
However, in the fifth embodiment shown in FIG. 5, portions corresponding to the respective portions of the fourth embodiment in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.

The synchronization device 5 according to the fifth embodiment shown in FIG.
00 is different from the fourth embodiment in that the power detection circuit 1
10 and correlation value power sample differential absolute value output device 112
And the correlation value power scaler 111 described in the first embodiment is connected.

In this case, the correlation value power scaler 111
Then, a scaling coefficient corresponding to the gain correction value from the AGC circuit 101 (in this case, a coefficient for canceling a change in gain according to the gain correction value) is obtained, and the scaling coefficient is used as the power detection circuit 110. Is performed by multiplying the correlation value power signal from.

By this scaling, the change in the correlation value power corresponding to the change in the gain correction value after the start of the detection of the reception timing is accurately emphasized.

Correlation value power sample differential absolute value output device 1
At 12, the correlation value power signal scaled by the correlation value power scaler 111 is handled in units of samples, such as 1, 2,..., N, from the reception timing detection start instruction. Is differentiated. Thereafter, the same processing as that described in the fourth embodiment is performed.

As described above, the synchronization device 50 according to the fifth embodiment
According to 0, if the received signal is greatly corrected by the gain correction circuit during the current reception timing detection, even if the received signal cannot be detected due to fading fluctuation or the like, even if the received signal cannot be detected, , The timing can be complemented, so that the reception timing can be accurately detected.

(Embodiment 6) FIG.6 is a block diagram showing a configuration of a synchronizer according to Embodiment 6 of the present invention.
However, in the sixth embodiment shown in FIG. 6, portions corresponding to the respective portions of the fifth embodiment in FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted.

The synchronization device 6 according to the sixth embodiment shown in FIG.
00 is different from the fifth embodiment in that the reception quality measuring device 201 described in the second embodiment is provided.

That is, the reception quality measuring device 201 measures the reception quality of the signal output from the correlator 109 and outputs the signal to the correlation value power scaler 111. The correlation value power scaler 111 performs scaling corresponding to the reception quality. A coefficient (in this case, a coefficient for canceling a change due to reception quality) is obtained, and scaling is performed by multiplying the correlation value power signal from the power detection circuit 110 by the scaling coefficient.

By this scaling, the change in the correlation value power corresponding to the change in the reception quality after the start of the reception timing detection is accurately emphasized. Thereafter, the same processing as that described in the fifth embodiment is performed.

As described above, the synchronization device 60 according to the sixth embodiment is used.
According to 0, when the reception quality greatly changes during the detection of the current reception timing, even if the reception signal cannot be detected due to fading fluctuation or the like, the timing is complemented from the past information. Therefore, the reception timing can be accurately detected.

(Embodiment 7) FIG.7 is a block diagram showing a configuration of a synchronizer according to Embodiment 7 of the present invention.
However, in the seventh embodiment shown in FIG. 7, parts corresponding to the respective parts of the sixth embodiment in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted.

The synchronization device 7 according to the seventh embodiment shown in FIG.
00 is different from Embodiment 6 in that the scaling coefficient controller 301 described in Embodiment 3 is provided.

The scaling coefficient controller 301 has an AGC
Gain correction value and reception quality measuring device 20 from circuit 101
A scaling coefficient to be multiplied by the correlation value power signal from the power detection circuit 110 is obtained based on the reception quality from 1.
It is output to the correlation value power scaler 111.

The scaling coefficient in this case is a coefficient for canceling a change in gain according to the gain correction value and canceling a change due to reception quality. For example, the scaling coefficient is multiplied by a constant multiplier. Then, the reception quality is obtained by multiplying the reception quality by a constant multiplier and adding the multiplication results of both.

The correlation value power scaler 111 performs scaling in which the scaling coefficient is multiplied by the correlation value power signal.

By this scaling, the change in the correlation value power corresponding to the change in the gain correction value and the change in the reception quality after the start of the reception timing detection is accurately emphasized. Thereafter, the same processing as described in the sixth embodiment is performed.

As described above, the synchronization device 70 according to the seventh embodiment
According to 0, when the received signal is greatly corrected by the gain correction circuit during the detection of the current reception timing, and when the reception quality is largely changed, the received signal cannot be detected due to further fading fluctuation or the like. Even if it falls, the timing can be complemented from the past information, so that the reception timing can be accurately detected.

[0094]

As described above, according to the present invention,
Even when a received signal is affected by a delayed wave or a sudden deterioration in reception quality, the reception timing can be accurately detected.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a synchronization device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a synchronization device according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a synchronization device according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a synchronization device according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a synchronization device according to a fifth embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a synchronization device according to a sixth embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a synchronization device according to a seventh embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of a conventional synchronization device.

[Explanation of symbols]

100, 200, 300, 400, 500, 600, 7
00,800 Synchronizer 101 AGC circuit 102 A / D converter 105 Reception window control circuit 109 Correlator 110 Power detection circuit 111 Correlation value power scaler 112 Correlation value power sample differential absolute value output device 115 Maximum value search device 116 Latch circuit 201 Reception quality measuring device 301 Scaling coefficient controller 401 Sample unit averaging circuit 402 Memory

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Claims (12)

[Claims] 1. A gain correcting means for correcting a gain of a received signal, and an A / D converter for A / D converting the gain-corrected signal.
/ D conversion means, reception window control means for instructing start of detection of reception timing of the reception signal, correlation means for obtaining a correlation value between the A / D converted signal and a known signal, and power of the correlation value Power detection means for detecting the gain, a first correction amount for canceling a change in gain according to the gain correction value, scaling means for correcting the power with the first correction amount, and A differential absolute value output means for differentiating between arbitrary samples and outputting an absolute value of the differentiation result; a maximum value searching means for searching for a maximum value in the absolute value from a detection start time of the reception timing; Holding means for holding the value and the order of the sample of the maximum value. 2. A reception quality measuring unit for obtaining reception quality from a correlation value obtained by the correlation unit, wherein the scaling unit corrects the power of the correlation value by using a first correction amount instead of correcting the reception quality. 2. The synchronizing device according to claim 1, wherein a second correction amount for canceling the change caused by the correction is obtained, and the power of the correlation value is corrected by the second correction amount. 3. A reception quality measuring means for obtaining reception quality from a correlation value obtained by the correlation means, and a scaling for obtaining a change in gain according to a correction value of the gain and a third correction amount for canceling the change due to the reception quality. A coefficient control unit, wherein the scaling unit corrects the power of the correlation value with the third correction amount instead of correcting the power of the correlation value with the first correction amount. The synchronizing device according to 1. 4. A gain correcting means for correcting a gain of a reception signal, and an A / D converter for A / D converting the gain-corrected signal.
/ D conversion means, reception window control means for instructing start of detection of reception timing of the reception signal, correlation means for obtaining a correlation value between the A / D converted signal and a known signal, and power of the correlation value Power detection means for detecting the detected power, differential absolute value output means for differentiating the detected power between arbitrary samples, and outputting the absolute value of the differentiation result, and starting detection of the reception timing in current and previous reception timing detection. A sample unit averaging means for calculating an average value of the absolute values of the same sample counted from time, a storage means for storing the average value as an absolute value in the previous reception timing detection, and a detection start time of the reception timing. Maximum value search means for searching for the maximum value of the average value; and a storage for storing the searched maximum value and the order of samples of the maximum value. Synchronization apparatus characterized by comprising a means. 5. A first correction amount for canceling a change in gain according to the correction value of the gain is obtained between the power detection means and the differential absolute value output means, and the power detection means is calculated based on the first correction amount. And a scaling means for correcting the power of the correlation value from, and the differential absolute value output means differentiates the corrected power between arbitrary samples and outputs the absolute value of the differential result. 5. The synchronization device according to 4. 6. A reception quality measuring means for obtaining reception quality from a correlation value obtained by the correlation means, wherein the scaling means corrects the power of the correlation value by a first correction amount, 6. The synchronization device according to claim 5, wherein a second correction amount for canceling the change due to the correction is obtained, and the power of the correlation value is corrected by the second correction amount. 7. A reception quality measuring means for obtaining reception quality from a correlation value obtained by the correlation means, and a scaling for obtaining a change in gain according to a correction value of the gain and a third correction amount for canceling the change due to the reception quality. A coefficient control unit, wherein the scaling unit corrects the power of the correlation value with the third correction amount instead of correcting the power of the correlation value with the first correction amount. 5. The synchronizing device according to 5. 8. A mobile station device comprising the synchronization device according to claim 1. Description: 9. A base station apparatus comprising the synchronizer according to claim 1. Description: 10. A mobile communication system comprising the mobile station device according to claim 8 or the base station device according to claim 9. 11. The gain of a received signal is corrected, the gain-corrected signal is A / D-converted, a correlation value between the A / D-converted signal and a known signal is obtained, and the power of the correlation value is calculated. Detecting a first correction amount for canceling a change in gain according to the correction value of the gain, correcting the power with the first correction amount, differentiating the corrected power between arbitrary samples, A synchronization method comprising: searching for a maximum value in an absolute value of a result; and storing the searched maximum value and an order of samples of the maximum value. 12. The gain of a received signal is corrected, the gain-corrected signal is A / D-converted, a correlation value between the A / D-converted signal and a known signal is obtained, and the power of the correlation value is calculated. Detected, differentiate the detected power between arbitrary samples, output the absolute value of the differentiated result, find the average value of the absolute values of the samples at the same detection time in the current and previous reception timing detection, and Synchronization characterized by storing an average value as an absolute value in the previous reception timing detection, searching for a maximum value in the average value, and retaining the searched maximum value and the order of samples of the maximum value. Method.