JP2003060527A - Path search window setting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a path search setting device capable of detecting a path search window precisely. SOLUTION: The path search setting device is provided with a plurality of effective path detectors having a correlating device for correlating the same spreading code as that used on a transmitting side and a received signal, an averaging means for averaging the correlation value outputted by the correlating device through a prescribed period, and a comparing means for comparing the average value outputted by the averaging means with a threshold to indicate the possibility of the existence of an effective path by each sector; a shifting determining device which determines shifting to the determination of the path search window when even a single effective path exists in plurality of sectors; a path search window determining device for determining a sector to be used for path search, and the path search window in the sector by the number of the effective paths in each sector and the number of effective paths in a slot; and a sector selector consisting of a selector for selecting the output of the effective path detectors corresponding to the selector determined by the path search window determining means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a code division multiple access (generally abbreviated as "CDMA") as a multiple access system.
This is an acronym for Code Division Multiple Access. In the path search window setting device of the cellular communication system to which the) system is applied, the path required by the base station when the base station receives the signal transmitted from the mobile station desiring to communicate and despreads it to the baseband signal. When detecting timing, the path timing can be accurately detected, and even if the path timing may change with the movement of the mobile station, a time window or path that tracks the changing path timing. The present invention relates to a path search setting device capable of setting a search window with a necessary minimum width.

In recent years, the demand for cellular communication represented by mobile phones has been rapidly increasing, and the number of cellular communication terminals in practical use is already the same as the number of fixed telephone terminals installed in offices and homes. This is higher than expected, and demand is expected to continue increasing. In order to meet such an increase in demand, it is necessary to expand the communication capacity with high frequency utilization efficiency. Therefore, the time division multiple access (usually "TDMA") which has already been widely used as a multiple access system is used.
Is abbreviated. This is Time Domain Multiple Access
Is an abbreviation for the acronym. ) Introducing a code division multiple access system to replace the system.

In the code division multiple access system, the transmitting side spreads with a different spreading code for each communication signal and converts it into a wideband signal with a very small power per unit band for transmission. Therefore, in the wireless section, each communication signal is transmitted. As many signals as spread with different spreading codes are present at the same time as the number of communication signals. And
The baseband signal is extracted from the received signal by correlating the received signal with the received signal on the receiving side using the same spreading code as the code used to spread the communication signal on the transmitting side (this process is called "despreading"). The communication signal transmitted by performing "demodulation" is reproduced.

Therefore, in order to maximize the communication capacity of the code division multiple access system itself, the communication signal from the desired station as the communication partner exists in the communication signal or space of the interfering station that is not the communication partner. The ability to discriminate accurately and quickly from noise is needed. In general, many cells that make up a cellular communication system may reflect radio waves from buildings, hills, etc. Therefore, a plurality of communications are performed between a specific mobile station and a base station that controls the cell. Path (hereinafter,
It is simply abbreviated as “path”. ) Exists and the path is different, the propagation delay time is usually different. Therefore,
In order to accurately discriminate the communication signal of the desired station, it is necessary to know the timing (this is called "path timing") at which the most probable path is highly correlated.

Now, when the position of the mobile station with respect to the base station changes, the path changes and the path timing also changes. Therefore, it is necessary to keep track of the path timing of the desired station by tracking the path timing that changes with the movement of the mobile station. The path searcher does this, and the path search window setting device plays the main role. In this case, if the search time for tracking the path timing is lengthened, the path timing can be surely grasped, but the longer the search time, the larger the circuit and processing amount of the path searcher.

Therefore, even if the path timing changes with the movement of the mobile station, a time window for tracking the changing path timing, that is, a path search window is set accurately and with a minimum necessary width. It is strongly desired to realize a path search window setting device capable of performing the above.

[0007]

2. Description of the Related Art FIG. 24 shows a main structure of a conventional path search window setting device for tracking path timing among base stations of a cellular communication system. Note that FIG. 24 also shows a plurality of mobile stations. In FIG. 24, reference numeral 101 denotes a desired station which is a communication partner, and for convenience sake, only a portion for spreading a communication signal is shown. It is assumed that C ₁ is used as the spreading code. Further, 102 is an interfering station that is not a communication partner and uses C ₂ as a spreading code. Further, 103 is an interfering station that is not a communication partner and uses C ₃ as a spreading code.
In FIG. 24, the desired station 101 and the interfering stations 102 and 103 are illustrated as existing, but of course, the interfering station is 2
It is not limited to stations. The desired station 101, the interfering station 102, and the interfering station 103 are not always mobile stations existing in the same sector.

Reference numeral 1c is an effective path detecting device, and there are as many effective path detecting devices as there are sectors into which a cell is divided. That is,
The valid path detector is unique to the sector receiver. Note that FIG. 24 illustrates the same number of valid path detection devices as the mobile stations (desired station and interfering station), but since the number of mobile stations and the number of sectors are independent, it is merely a coincidence in the figure. I want you to understand.

Then, the effective path detecting device 1c detects the maximum value of the correlator 11 and the maximum value of the output of the correlator 11, which correlates the same spreading code as the spreading code used on the transmitting side with the received signal. And means 17. Incidentally, the correlator 1
A matched filter is usually used for 1. And
The output of the valid path detection device 1c is
The timing and the amplitude of the correlation value at the path timing (hereinafter, the amplitude of the correlation value at the path timing may be abbreviated as “path amplitude”).

Reference numeral 2c is a sector selecting device for comparing the outputs of a plurality of valid path detecting devices to select a sector in which the amplitude of the valid path shows the maximum value, and 4c is the maximum of the path amplitude on the output of the sector selecting device 2c. Is a path search window determining device (which is abbreviated as “search window determining device” in the figure) but has the same segment as the path search window.
Then, the path timing information is formed by the sector information output by the sector selection device 2c and the path search window information output by the path search window determination device 4c.

Reference numeral 5 denotes a spread code generator which generates a spread code under the control of the sector information output from the sector selector 2c, and 6 receives a communication signal transmitted by the spread code output from the spread code generator 5. It is a despreader that extracts from the signal. The output of the despreading device is the demodulation information. The sector selecting device 2c, the path search window determining device 4c, the spreading code generating device 5 and the despreading device 6 are unique to one sector receiving device. That is, FIG.
Reference numeral 4 shows an effective path detecting device 1c included in a plurality of sector receiving devices, a sector selecting device 2c, a path search window determining device 4c, a spreading code generating device 5 and a despreading device 6 included in a single sector receiving device. Has been done. Of these, the part excluding the spreading code generator 5 and the despreading device 6 is the conventional path search window setting device.

In the radio section between the desired station and the base station, in addition to the communication radio waves of a plurality of interfering stations, radio waves associated with various natural phenomena, radio waves generated by power systems and production systems, and cellular communication. There are noise radio waves such as radio waves used by a communication system different from the system. Therefore,
The correlator 11 in FIG. 24 outputs the correlation value between signal inputs from a large number of desired stations and interfering stations and one spreading code. The maximum value detecting means 17 detects the amplitude of the path having the maximum amplitude in the output of the correlator 11 and its timing.

The sector selection device 2c compares the amplitudes of the paths output by the respective effective path detection devices and selects the output (path amplitude and path timing) of the effective path detection device having the maximum path amplitude. The sector information is supplied to the spreading code generator 5 and the path search window determiner 4c. path·
The search window determination device 4c scans the output of the sector selection device 2c on a time axis for each slot, and passes a segment (which is obtained by dividing the slot into a plurality) including a timing at which the amplitude of the path becomes maximum.・ Determine as the search window.

That is, in the base station, the path search window setting device determines the amplitude of the path from among the desired waves of the plurality of paths of the desired station, the interference waves of the plurality of paths of the plurality of interfering stations, and the noise radio waves being superimposed. Assuming that the maximum timing is the most probable path timing, the segment including the timing is determined as the path search window. Since the time of this segment is extremely short compared with the delay time in the entire cell, the time for tracking the path timing can be greatly shortened. That is, the circuit scale and processing scale of the path search window setting device can be greatly reduced.

[0015]

[Problems to be Solved by the Invention]
In the search window setting device, the maximum correlation value is detected for each effective path detection device, and the sector corresponding to the effective path detection device that outputs the maximum correlation value among the plurality of effective path detection devices is most likely. Since the segment showing the maximum correlation value among the slots in the sector was selected as the path search window for the path timing, the communication signal of the interfering station and the noise radio wave and the desired station If the correlation value with the spread code happens to exceed the correlation value between the communication signal of the desired station and the spread code of the desired station and shows the maximum value, there is a risk that the timing may be mistaken for the path timing. .

When the wrong timing is mistakenly recognized as the correct path timing, the spread code cannot be synchronized between the transmission and the reception, and an effective demodulated signal cannot be obtained. Therefore, once opened
It becomes necessary to close the search window and restart the path timing search in all cells, during which communication is temporarily interrupted and service is degraded.

In view of such a problem, the present invention is a path search window setting device of a cellular communication system which applies a code division multiple access system as a multiple access system, in which a base station transmits from a mobile station desiring communication. When detecting the path timing required by the base station when receiving the signal and despreading it to the baseband signal, it is possible to accurately detect the path timing, and the path timing changes as the mobile station moves. An object of the present invention is to provide a path search setting device capable of setting a narrow time window, that is, a path search window for tracking the changing path timing even if it changes.

[0018]

According to a first aspect of the present invention, a correlator for correlating a received signal with a spreading code that is the same as the spreading code used on the transmitting side, and a correlation value output by the correlator for a predetermined period. First averaging means for averaging over, a threshold calculating means for calculating a threshold for valid path determination using the average value output by the first averaging means, and the first averaging means Comparing means for outputting the average value output by the threshold value calculating means with the threshold value output by the threshold value calculating means and outputting the average value and the timing at which the average value exceeds the threshold value, and suggesting the possibility of existence of an effective path for each sector. And a plurality of valid path detecting devices each having an effective path detecting device that receives an output from each valid path detecting device and is effective when there is a possibility that even one of the plurality of sectors has a valid path. Transition decision to decide the transition to search window decision processing A device, a path search window determining device that determines a sector used for path search, a path search window in the sector, and a bus search window determining device according to the number of valid paths for each sector and the timing of the valid paths. A path search window setting device, comprising: a sector selection device including a selector that selects an output of an effective path detection device corresponding to the determined sector.

According to the first invention, the first averaging means for averaging the correlation values output by the correlator for each sector receiving device over a predetermined time and the average value output by the first averaging means. And a comparing unit that determines that the timing at which the average value exceeds the threshold value is a path timing at which there is a high possibility that an effective path exists by comparing with a threshold value calculated based on the received signal using Even if the correlation value with the interference radio wave or the noise radio wave is increased by chance, the influence of the correlation value increased by chance is reduced by averaging, and the possibility of erroneously recognizing the path timing is reduced. Further, since a valid path is referred to for each sector when the path search window is determined, more reliable diversity reception is possible.

A second aspect of the invention is the path search window setting device of the first aspect of the invention, in which the average output of the comparing means is averaged over a predetermined number of times for each effective path detecting device. A path characterized by adding
It is a search window setting device. According to the second invention, in the path search window setting device of the first invention, a second averaging means for averaging the output of the comparing means over a predetermined number of times is provided for each of the valid path detecting devices. I will add it,
Even if the correlation value with the interference radio wave or the noise radio wave is increased by chance, the influence of the correlation value increased by chance is further reduced, and the possibility of erroneously recognizing the path timing is further reduced.

A third aspect of the present invention is the path search window setting device according to the first aspect or the second aspect of the invention, wherein the valid path detection device is set to the valid timing at each valid timing instead of the sector selection device. The output of either the summation means or the delay dispersion calculation means is compared with either the summation means for calculating the sum of the outputs of the path detection device or the delay dispersion calculation means for calculating the dispersion of the delay time of the effective timing. A sector selecting device comprising a comparing means and a selector for selecting the output of the effective path detecting device corresponding to the output of the magnitude comparing means is arranged, and instead of the bus search window determining device, the output of the transition determining device is used. Path search window determination that starts operation and determines the path search window according to the timing of the valid path in the sector selected by the sector selection device A path search window setting device, characterized in that to place the location.

According to the third aspect of the invention, a summing means for calculating the sum of the outputs of the valid path detecting devices at the valid timing for each of the valid path detecting devices or a delay dispersion calculating means for calculating the variance of the delay times of the valid timings. Sector selection including a magnitude comparison means for comparing the output of either the summation means or the delay variance calculation means, and a selector for selecting the output of the effective path detection device corresponding to the output of the magnitude comparison means. And a path search window determining device that starts operation by the output of the transition determining device and determines a path search window according to the number of effective paths in the sector selected by the sector selecting device. Therefore, when the summing means is provided, the sector is accurately selected when there are many effective paths or when the delay spread is large. It is possible, it is possible to determine the further it is sufficient to determine the path search window accurately path search window relative sector to which the sector selection unit selects. Further, when the delay dispersion calculation means is provided, it is possible to obtain a measure of the extent of the temporal position where an effective path exists, and it is possible to efficiently determine the path search window.

According to a fourth aspect of the present invention, in the path search window setting device of the third aspect, when the sector selection device includes the delay dispersion calculation means, the sector selection device includes the delay dispersion calculation means and the delay dispersion calculation means. A third averaging means for averaging the output of the delay variance calculating means, a magnitude comparing means for comparing the outputs of the third averaging means, and an effective path detecting device corresponding to the output of the magnitude comparing means. A path search window setting device comprising a selector for selecting an output.

According to the fourth invention, the sector selection device includes the delay dispersion calculation means, a third averaging means for averaging the outputs of the delay dispersion calculation means, and the third averaging means. And a selector for selecting the output of the effective path detecting device corresponding to the output of the size comparing means, so that the path search window is opened with the average of the delay times of the effective paths as the center. Therefore, the position of the path search window can be adaptively determined.

A fifth invention is the path search window setting device according to the third invention or the fourth invention, wherein the summing means sets the effective path detecting device at an effective timing for each effective path detecting device. When calculating the sum of the outputs, weighting corresponding to the amplitude of the received signal is performed for each output of the path detecting device, and when the delay dispersion calculating means calculates the dispersion of the delay time of the timing of the effective path, the delay time is calculated with respect to the delay time. A path search window setting device characterized by performing weighting.

According to the fifth aspect of the invention, the summing means weights the amplitude when calculating the sum of the outputs of the valid path detecting devices at the valid timing for each of the valid path detecting devices. It becomes possible to determine the path search window in addition to the judgment material, and the path search window can be accurately determined.
In addition, since the delay dispersion calculation means weights the delay time when calculating the dispersion of the delay time of the effective timing, it becomes possible to obtain a measure of the extent of the temporal position where the effective path exists. The path search window can be efficiently and accurately determined.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION The technique of the present invention will be described in detail below with reference to specific drawings. FIG. 1 is a basic configuration of a first embodiment of the present invention, and FIG. 7 is a configuration of a sector selection device according to the first, second, sixth, and seventh embodiments of the present invention.
FIG. 13 is a diagram showing the function and schematic configuration of the first averaging means, and the configuration of the first embodiment of the present invention will be clarified by the combination of FIG. 1, FIG. 7 and FIG.

In FIG. 1, reference numeral 1 is an effective path detecting device for detecting and outputting information on the timing of the effective path and the amplitude of the effective path, and there are as many effective path detecting devices as there are spatially divided sectors of the cell. To do. That is, the effective path detecting device is unique to the sector receiving device that constitutes the base station, and the effective path detecting device 1 takes the correlation between the spreading code same as the spreading code used on the transmitting side and the received signal. Correlator 1
1, a first averaging means 12 for calculating an average value of the output of the correlator 11, a threshold calculating means 13 for calculating a threshold value for detecting an effective path from the output of the first averaging means 12, a first When the amplitude of the output of the averaging means 12 exceeds the amplitude of the output of the threshold value calculating means 13, a valid timing and a comparing means for outputting the amplitude of the valid path (in the figure, simply referred to as "comparison", the same). The same applies to the following figures.). A matched filter is usually used for the correlator 11.

2 is 1 from the outputs of a plurality of effective path detectors.
A sector selection device for selecting the output of one effective path detection device, that is, the output of the effective path detection device corresponding to a specific sector in which the presence of a desired station is most likely, as shown in FIG.
The selector 21 is used. Reference numeral 3 denotes a transition determination device that determines transition to the path search window determination processing. In this case, when there is a possibility that a valid path exists even in one of a plurality of sectors, the valid path determination signal is set to enable transition determination. It is provided with an effective path determining means 31 for outputting as a signal.

Reference numeral 4 denotes a path search window determining device that receives the output of the valid path determining means 31 as a transition determination enable signal and determines the path search window using the outputs of a plurality of valid path detecting devices. The window determining device 4 outputs the information of the sector in which the presence of the desired station is most likely and the segment information which is the time window information including a lot of the most probable path timing on the sector in which the presence of the desired station is most likely. Of these, the sector information is supplied as a selection signal to the selector 21 which constitutes the sector selection device 2.

Reference numeral 5 is a spreading code generator which generates a spreading code under the control of the output of the path timing detecting device corresponding to the sector information output from the sector selecting device 2, and 6 is a spreading code output from the spreading code generating device 5. It is a despreading device that extracts a communication signal transmitted from a received signal by a code. Then, the output of the despreading device becomes the demodulation information. Here, the sector selection device 2, the transition determination device 3, the path search window determination device 4, the spreading code generation device 5, and the despreading device 6 are unique to one sector reception device. That is, FIG.
The effective path detecting device 1 provided in a plurality of sector receiving devices
And a sector selection device 2 provided in a single sector receiving device,
A transition determining device 3, a path search window determining device 4, a spreading code generating device 5 and a despreading device 6 are shown. Of these, the parts excluding the spreading code generating device 5 and the despreading device 6 are paths of the present invention. -Configure a search window setting device.

Now, the correlator 11 is a communication radio wave of the desired station,
The correlation value between a large number of reception inputs including communication radio waves and noise radio waves of the interfering station and a specific spreading code is output. The first averaging means 12 is basically an adder 12-1 as shown in FIG.
And a divider 12-2, which calculates and outputs the average of correlation values in a plurality of slots. In order to obtain the average of the correlation values in the plurality of slots, the correlation values in the plurality of slots may be sequentially written in the shift register, read in parallel, added, and divided by the number of slots.

The comparing means 14 compares the output amplitude of the first averaging means 12 with the output amplitude of the threshold value calculating means 13,
When the output amplitude of the first averaging means 12 exceeds the output amplitude of the threshold calculating means 13 (when the output amplitude of the first averaging means 12 exceeds the output amplitude of the threshold calculating means 13, the path is a valid path. The output of the first averaging means 12 is sent as the output of the effective path detecting device.

The outputs of the plurality of valid path detecting devices are supplied to the valid path determining means 31, the path search window determining device 4 and the sector selecting device 2 which constitute the migration determining device 3. Of these, the valid path determination means 31 supplies a valid path determination signal to the path search window determination device 4 as a transition determination enable signal if there is at least one valid path information in the outputs of the plurality of valid path detection devices. Now, description will be made assuming that the valid path determination means 31 has output the transition determination enable signal.

When receiving the transition decision enable signal from the valid path decision means 31, the path search window decision device 4 enters the path search window decision process and selects the most probable sector and the most probable segment in the sector. Determined as the path search window. Of these, the sector information is supplied to the selector 21 constituting the sector selection device 2, and the output of the effective path detection device corresponding to the sector is supplied to the spreading code generation device 5.

Then, in the despreading device 6, the spreading code generated by the spreading code generating device 5 and the received signal are correlated and demodulated. The above operation is expressed in a flowchart as shown in FIG. There are some overlaps,
Hereinafter, the operation of the first embodiment of the present invention will be described with reference to the reference numerals in FIG.

S1. The correlator obtains a correlation value with the received signal using a specific spreading code, and inputs the correlation value to the first averaging means. Here, the communication signal of the mobile station i is D
_i (t), the spreading code used is C _i (t), the impulse response of the communication channel is CH _i (t), and the noise of the communication channel is N _i (t), the received signal R (t) Is given by equation (1). However, n is the number of mobile stations.

[0038]

[Equation 1]

That is, the received signal is the sum of a plurality of communication signals arriving via the communication path and noise in the communication path. At this time, assuming that the impulse response of the spread code of the correlator is h ₁ (t), the output R _h (t) of the correlator is given by the convolution integral of the received signal R (t) and h ₁ (t). The output R _h (t) of the correlator is expressed by equation (2).

[0040]

[Equation 2]

S2. The first averaging means averages the correlation value over a predetermined number of slots. This is R
_{Let hAV} (t). S3. The threshold calculation means calculates a threshold for valid path determination using the output of the first averaging means. Set the threshold to L ₁
And the constant obtained by the experiment is X, the threshold L ₁
Is expressed by equation (3).

[0042]

[Equation 3]

Here, the integration time of the equation (3) is set to be sufficiently long with respect to the time of the predetermined number of slots in which the first averaging means averages the correlation values. The constant X obtained by the experiment
Is added because the reliability of the threshold value itself can be made higher than the threshold value obtained from only the received signal. S4. The comparing means compares the output amplitude of the first averaging means with the output amplitude of the threshold calculating means, and when the output amplitude of the first averaging means is equal to or larger than the output amplitude of the threshold calculating means, the first averaging means. Send the output of.

S5. The valid path determining means that constitutes the migration determining device determines whether or not there is at least one valid path information in the outputs of the plurality of valid path detecting devices. If there is no valid path information (No), the process is once terminated and the above valid path detection is tried again. S6. In step S5, if there is only one piece of valid path information (Yes), the migration determination device outputs a migration determination enable signal that prompts the path search window determination device to perform the path search window determination processing.

In step S7, the path search window determination device counts the number of valid paths for each piece of valid path information output by the valid path detection device corresponding to each sector. The count result for each sector is N _{SE CT} . S8. Further, the path search window determination device counts the number of effective paths for each segment of each sector. The counting result for each segment is N _SEG .

S9. The product of the count result N _{SECT for} each sector and the count result N _SEG for each segment is brute-forced, and the combination of the sector and segment that maximizes the product is determined to be the sector and segment used for path search. The process is once ended. Note that FIG. 14 is a diagram for explaining segment determination. In the case of the first embodiment of the present invention,
Counting the effective number of passes for each sector together with (N _SECT) for each counting an effective number of passes for each segment obtained by dividing a slot on the sector of the (N _SEG) and, N _SECT · N _SEG with brute
Find the combination of sector and segment that maximizes.
Therefore, in the example of FIG. 14, segment # 3 is selected as the most probable segment.

That is, according to the first embodiment of the present invention, the path search window setting device in the base station sets the desired waves of a plurality of paths of the desired station, the interference waves of a plurality of paths of the plurality of interfering stations, and noise radio waves. It is judged that there is an effective path when the average amplitude of the correlation value exceeds the threshold value, and the timing at which the product of the number of effective paths for each sector and the number of effective paths for each segment is the most probable. A segment including the timing is determined as a path timing and is determined as a path search window.

Since the time of this segment is extremely short compared with the delay time in the entire cell, the time for tracking the path timing can be greatly shortened.
That is, the circuit scale and processing scale of the path search window setting device can be greatly reduced. Moreover, when the average amplitude of the correlation value exceeds the threshold value, it is determined that there is an effective path,
Since the timing that maximizes the product of the number of valid paths for each sector and the number of valid paths for each segment is the most probable path timing, the segment including the relevant timing is determined as the path search window. Even if the correlation value between the noise radio wave and the spreading code of the desired station accidentally exceeds the correlation value between the communication signal of the desired station and the spreading code of the desired station and shows the maximum value, the timing of showing the maximum value It is possible to reduce the risk of erroneously recognizing that it is the path timing immediately, and improve the reliability of the path search.

FIG. 2 is a basic configuration of the second embodiment of the present invention, and FIG. 7 is a configuration of a sector selection device according to the first, second, sixth and seventh embodiments of the present invention. 13 is a diagram showing the function and schematic configuration of the first averaging means, and the configuration of the second embodiment of the present invention will be clarified by the combination of FIG. 2, FIG. 7 and FIG. In FIG. 2, reference numeral 1a denotes an effective path detecting device that detects and outputs information on the timing of the effective path and the amplitude of the effective path, and there are as many effective path detecting devices as there are sectors into which a cell is divided.

Then, the effective path detecting apparatus 1a calculates the average value of the output of the correlator 11 and the correlator 11 for correlating the same spreading code as the spreading code used on the transmitting side with the received signal. Averaging means 12, threshold calculating means 13 for calculating a threshold for detecting an effective path from the output of the first averaging means 12, and the amplitude of the output of the first averaging means 12 corresponds to the output of the threshold calculating means 13. The comparison means 14 outputs the timing of the effective path and the amplitude of the effective path when the amplitude is exceeded, and the second averaging means 15 which averages the output of the comparison means 14 a plurality of times.

Reference numeral 2 is a sector selection device for selecting the output of the effective path detecting device corresponding to the specific sector in which the mobile station is most likely to exist from the outputs of the plurality of effective path detecting devices. As shown in FIG. Composed by. Reference numeral 3 denotes a transition determination device that determines transition to the path search window determination processing. In this case, when there is a possibility that a valid path exists even in one of a plurality of sectors, the valid path determination signal is set to enable transition determination. Effective path determination means 3 for outputting as a signal
1 is provided.

Reference numeral 4 denotes a path search window determining device which receives the output of the effective path determining means 31 as a transition determination enable signal and determines the path search window by using the outputs of a plurality of effective path detecting devices. The window determining device 4 outputs sector information and segment information. Of these, the sector information is supplied as a selection signal to the selector 21 which constitutes the sector selection device 2.

Reference numeral 5 denotes a spread code generator which generates a spread code under the control of the output of the path timing detector corresponding to the sector information output from the sector selector 2, and 6 the spread code output from the spread code generator 5. It is a despreading device that extracts a communication signal transmitted from a received signal by a code. The output of the despreading device is the demodulation information. Figure 1
Similarly to FIG. 2, the effective path detecting device 1a included in the plurality of sector receiving devices, the sector selecting device 2, the transition determining device 3, the path search window determining device 4, and the spreading code included in the single sector receiving device are shown in FIG. A generator 5 and a despreader 6 are shown, of which a spreading code generator 5 and a despreader 6 are shown.
The part excluding "" constitutes the path search window setting device of the present invention.

FIG. 16 is a flow chart showing the operation of the second embodiment of the present invention. Although there is a portion overlapping with FIG. 15, it is difficult to understand the technique of the present invention in a partial explanation, so the operation of the second embodiment of the present invention will be intentionally described along the reference numerals of FIG. 16. S11. The correlator obtains a correlation value with the received signal using a specific spreading code, and inputs the correlation value to the first averaging means.

Here, the received signal R (t) is given by the equation (1), and the correlation value is given by the equation (2). S12. The timer provided in the second averaging means is initialized. A counter may be used instead of the timer. S13. The first averaging means averages the correlation value over a predetermined number of slots.

S14. The threshold calculation means calculates a threshold for valid path determination using the output of the first averaging means. The threshold L ₁ is represented by the equation (3). S15. The comparing means compares the output amplitude of the first averaging means with the output amplitude of the threshold calculating means, and when the output amplitude of the first averaging means is equal to or larger than the output amplitude of the threshold calculating means, the first averaging means. Send the output of.

S16. The second averaging means performs addition calculation of the output of the comparing means. S17. The second averaging means increments the timer. S18. The second averaging means determines whether or not the timer has reached a predetermined time. If the predetermined time has not been reached (No), the process jumps to step S13 and the processes up to step S18 are repeated.

S19. If it is determined in step S18 that the timer has reached the predetermined time (Yes), the second averaging means divides the addition result by the predetermined number of additions to obtain the average value. S20. The valid path determination means that constitutes the migration determination device,
It is determined whether or not there is at least one piece of valid path information in the outputs of the plurality of valid path detecting devices.

If there is no valid path information (No), the process is once terminated and the above-mentioned valid path detection is tried again. S21. In step S20, if there is even one piece of valid path information (Yes), the migration determination device outputs a migration determination enable signal that prompts the path search window determination device to perform the path search window determination processing.

S22. The path search window decision devices are
Valid path output by the valid path detection device corresponding to the sector
The number of valid paths is counted for each item of information. Count result for each sector
To N _SECTAnd S23. In addition, the path search window determination device uses the sector of each sector.
The number of valid paths is counted for each segment. By segment
Count result as N_SEGAnd

S24. The product of the count result N _{SECT for} each sector and the count result N _SEG for each segment is brute-forced, and the combination of the sector and segment that maximizes the product is determined to be the sector and segment used for path search. The process is once ended. That is, in the second embodiment of the present invention, the path search window setting device in the base station superimposes desired waves of a plurality of paths of a desired station, interference waves of a plurality of paths of a plurality of interfering stations, and noise radio waves. The average amplitude of the correlation value exceeding the threshold value is averaged over multiple times, and the timing at which the product of the number of effective paths for each sector and the number of effective paths for each segment is the maximum is the most probable path timing. The segment including the timing is determined as the path search window.

Since the time of this segment is extremely short compared to the delay time in the entire cell, the time for tracking the path timing can be greatly shortened.
That is, the circuit scale and processing scale of the path search window setting device can be greatly reduced. Moreover, the timing at which the product of the number of valid paths for each sector and the number of valid paths for each segment is averaged is the most probable path timing by averaging the average amplitude of correlation values exceeding the threshold value multiple times. Pass a segment containing
Since it is determined as the search window, the correlation value between the communication signal of the interfering station or noise radio wave and the spreading code of the desired station accidentally exceeds the correlation value between the communication signal of the desired station and the spreading code of the desired station, and shows the maximum value. However, the risk of erroneously recognizing the timing showing the maximum value as the path timing is further reduced, and the reliability of the path search can be further improved.

FIG. 3 is a basic configuration of the third and fifth embodiments of the present invention, FIG. 8 is a configuration of a sector selection device (part 1) in the third embodiment of the present invention, and FIG. FIG. 13 is a diagram showing a configuration (No. 2) of the sector selection device according to the third embodiment of the present invention, and FIG. 13 is a diagram showing a function and a schematic configuration of the first averaging means. That is, the configuration of the third embodiment of the present invention is clarified by the combination of FIG. 3, FIG. 8 or FIG. 9, FIG.

In FIG. 3, reference numeral 1 denotes an effective path detection device for detecting and outputting effective path timing and path amplitude information at the path timing, which is the same spreading code as the spreading code used on the transmitting side. A correlator 11 for correlating with a received signal, a first averaging means 12 for calculating an average value of outputs of the correlator 11, and an effective path timing for detecting an effective path timing from the output of the first averaging means 12. Threshold calculation means 13 for calculating a threshold value, a comparison that outputs the path timing effective when the amplitude of the output of the first averaging means 12 exceeds the amplitude of the output of the threshold calculation means 13 and the path amplitude at the path timing. Equipped with means.

Reference numeral 2a is a sector selection device for selecting the output of the effective path detecting device corresponding to a specific sector from the outputs of the plurality of effective path detecting devices, and has the structure shown in FIG. 8 or FIG. That is, in the case of FIG. 8, summing means 22, 22a and 22b for obtaining the sum of the amplitudes of the valid paths for each output of the valid path detecting device, and a magnitude comparison means 23 for comparing the magnitudes of the outputs of the plurality of summation means. And one of the outputs of the plurality of effective path detecting devices using the output of the magnitude comparing means 23 as a selection signal.
Sector selection device 2a by selector 21 for selecting one
Is configured. Further, in the case of FIG. 9, delay dispersion calculation means (which is abbreviated as “dispersion calculation means” in the figure, which calculates the dispersion of the delay time of the effective path for each output of the effective path detection device, is the same. The same applies to the following.) 24, 24a and 24b, a magnitude comparison means 23 for comparing the magnitudes of the outputs of a plurality of delay variance calculation means, and a plurality of outputs of the magnitude comparison means 23 as a selection signal. The selector 21 that selects one of the outputs of the path detection device constitutes the sector selection device 2a.

Reference numeral 3 is a transition decision device for deciding the transition to the decision process of the path search window. In this case, when there is a possibility that a valid path exists even in one of the plurality of sectors, the first enable signal. The effective path determination means 31 for outputting Reference numeral 4a denotes a path search window determining device that determines the path search window using the output of the sector selecting device 2a with the output of the valid path determining means 31 as the first enable signal. Output segment information and.

Reference numeral 5 is a spread code generator which generates a spread code under the control of the sector information output from the sector selector 2, and 6 is a communication signal transmitted from the received signal by the spread code output from the spread code generator 5. Is a despreader for extracting. The output of the despreading device is the demodulation information. Similar to FIG. 1, FIG. 3 shows an effective path detection device 1 included in a plurality of sector reception devices, a sector selection device 2a, a transition determination device 3, and a path search window determination device 4a included in a single sector reception device. A spreading code generating device 5 and a despreading device 6 are shown, and the part excluding the spreading code generating device 5 and the despreading device 6 constitutes the path search window setting device of the present invention.

FIG. 17 is a flow chart (No. 1) showing the operation of the third embodiment of the present invention, and FIG. 18 is a flow chart (No. 2) showing the operation of the third embodiment of the present invention. . The operation of the third embodiment of the present invention will be described below with reference to the reference numerals of FIGS. 17 and 18. First, FIG.
The case is as follows.

S31. The correlator obtains a correlation value with the received signal using a specific spreading code, and inputs the correlation value to the first averaging means. Here, the received signal R (t) is given by the equation (1), and the output R _h (t) of the correlator is given by the equation (2).
Given in. S32. The first averaging means averages the correlation value over a predetermined number of slots.

S33. The threshold calculation means calculates a threshold for valid path determination using the output of the first averaging means. When the threshold value is L ₁ and the constant obtained by the experiment is X, the threshold value L ₁ is expressed by the equation (3). S34. The comparing means compares the output amplitude of the first averaging means with the output amplitude of the threshold calculating means, and when the output amplitude of the first averaging means is equal to or larger than the output amplitude of the threshold calculating means, the first averaging means. Send the output of.

S35. The summing means adds the amplitudes of the valid paths for a predetermined period for each output of the valid path detecting device. S36. The magnitude comparing means compares the magnitudes of the sums output by the plurality of summing means, and instructs the selector to select the sector having the largest sum. According to this instruction, the sector used for the path search is selected.

S37. On the other hand, the valid path determining means that constitutes the migration determining device outputs 1 to the outputs of the plurality of valid path detecting devices.
It is determined whether there is any valid path information. If there is no valid path information (No), the process is once terminated and the above valid path detection is tried again. S38. In step S37, if there is only one piece of valid path information (Yes), the migration determination device outputs a migration determination enable signal that prompts the path search window determination device to perform path search window determination processing.

S39. The path search window determination device counts the number of valid paths for each segment for the sector selected in step S36. S40. The segment having the largest number of valid paths for each segment is determined to be the path search window, and the processing is temporarily terminated. FIG. 14 is a diagram illustrating determination of segments.

In the case of the third embodiment of the present invention, the sector is selected first, and the segment having the maximum number of effective paths for each segment obtained by dividing the slot on the sector is selected. Therefore, in the example of FIG.
3 is selected as the most probable segment. Next, the case of FIG. 18 is as follows.

S31 '. The correlator obtains a correlation value with the received signal using a specific spreading code, and inputs the correlation value to the first averaging means. Here, the received signal R (t) is given by the equation (1), and the output R _h (t) of the correlator is given by the equation (2).
Given in. S32 '. The first averaging means averages the correlation value over a predetermined number of slots.

S33 '. The threshold calculation means calculates a threshold for valid path determination using the output of the first averaging means. When the threshold value is L ₁ and the constant obtained by the experiment is X, the threshold value L ₁ is expressed by the equation (3). S34 '. The comparing means compares the output amplitude of the first averaging means with the output amplitude of the threshold calculating means, and when the output amplitude of the first averaging means is equal to or larger than the output amplitude of the threshold calculating means, the first averaging means. Send the output of.

S35 '. The delay dispersion calculating means calculates the dispersion of the delay time of the effective path for each output of the effective path detecting device for the amplitude for a predetermined period. S36 '. The magnitude comparing means compares the magnitudes of the delay variances output by the plurality of delay variance calculating means, and instructs the selector to select the sector having the smallest delay variance. According to this instruction, the sector used for the path search is selected.

S37 '. On the other hand, the valid path determination means that constitutes the migration determination device determines whether or not there is at least one valid path information in the outputs of the plurality of valid path detection devices. If there is no valid path information (No), the process is once terminated and the above valid path detection is tried again. S38 '. In step S37 ′, if there is even one valid path information (Yes), the transition determining device outputs a transition determining enable signal for prompting the path search window determining device to perform the path search window determining process. .

S39 '. The path search window determination device counts the number of valid paths for each segment for the sector selected in step S36 '. S40 '. The segment having the largest number of valid paths for each segment is determined to be the path search window, and the processing is temporarily terminated. That is, in the third embodiment of the present invention, desired waves of a plurality of paths of a desired station, interference waves of a plurality of paths of a plurality of interfering stations and the average amplitude of the correlation value from among the noise radio waves are superimposed. When the threshold is exceeded, it is determined that there may be an effective path, and the sum of the amplitudes of the effective paths for each sector or the sector with a large delay dispersion of the effective path is the sector used for path search,
Pass the segment with the largest number of valid paths on the sector.
Determined as a search window.

Therefore, when a sector having a large sum of the amplitudes of effective paths for each sector is used as a sector for path search, there are many effective buses and the most probable sector exists when the delay spread is large. Can be selected to increase the reliability of the path search window. If a sector with a small effective path delay dispersion for each sector is used for the path search, the most probable sector can be selected even if there are many effective paths. The reliability of the search window can be increased.

In FIG. 3, the sector selection device is replaced in the first embodiment of the present invention.
Of course, the sector selection device may be replaced in the second embodiment of the present invention. 4 is a basic configuration of the fourth embodiment of the present invention, FIG. 10 is a configuration of a sector selection device according to the fourth embodiment of the present invention, and FIG. 13 is a function of a first averaging means. It is a figure which shows schematic structure. That is, the configuration of the fourth embodiment of the present invention is clarified by the combination of FIG. 4, FIG. 10 and FIG.

In FIG. 4, reference numeral 1 denotes an effective path detection device for detecting and outputting information on the timing of the effective path and the amplitude of the effective path, which is the same as the spreading code used on the transmitting side and the received signal. Correlator 11 that takes a correlation, first averaging means 12 that calculates the average value of the output of correlator 11, and threshold calculation means that calculates a threshold value for detecting an effective path from the output of first averaging means 12. 13, first averaging means 12
When the amplitude of the output of 1 exceeds the amplitude of the output of the threshold calculation means 13, the timing of the effective path and the comparison means for outputting the amplitude of the effective path are provided.

Reference numeral 2b is a sector selection device for selecting the output of the effective path detecting device corresponding to a specific sector from the outputs of the plurality of effective path detecting devices, and has the structure shown in FIG. That is, the delay dispersion calculating means 24, 24a and 24b for calculating the dispersion of the delay times of the effective paths for each output of the effective path detecting device, and the delay times of the effective paths output by the delay dispersion calculating means 24, 24a and 24b are averaged. The third averaging means 25, 25a and 25b, and the magnitude comparing means 2 for comparing the magnitudes of the delay dispersions output by the plurality of delay dispersion calculating means.
3. A sector selection device including a selector 21 that selects a sector by using the output of the magnitude comparison means 23 as a selection signal, and a selector 21a that selects an average value of delay times of the sectors selected by using the output of the magnitude comparison means 23 as a selection signal. 2b
Is configured.

Reference numeral 3 denotes a transition decision device for deciding the transition to the path search window decision processing. In this case, when there is a possibility that a valid path exists even in one of a plurality of sectors, a valid path determination signal is sent. An effective path determining means 31 for outputting as a transition determination enable signal is provided. Reference numeral 4b is a path search window determining device that determines the path search window by using the output of the sector selecting device 2b with the output of the valid path determining means 31 as the transition determining enable signal. The path search window determining device 4b is a segment. Output information.

Reference numeral 5 is a spread code generator that generates a spread code under the control of the sector information output from the sector selector 2, and reference numeral 6 is a communication signal transmitted from the received signal by the spread code output from the spread code generator 5. Is a despreader for extracting. The output of the despreading device is the demodulation information. Similar to FIG. 1, FIG. 4 shows an effective path detecting device 1 included in a plurality of sector receiving devices, a sector selecting device 2b, a transition determining device 3, and a path search window determining device 4b included in a single sector receiving device. A spreading code generating device 5 and a despreading device 6 are shown, and the part excluding the spreading code generating device 5 and the despreading device 6 constitutes the path search window setting device of the present invention.

FIG. 19 is a flow chart showing the operation of the fourth embodiment of the present invention. The operation of the third embodiment of the present invention will be described below with reference to the reference numerals of FIG. S41. The correlator obtains a correlation value with the received signal using a specific spreading code, and inputs the correlation value to the first averaging means. Here, the received signal R (t) is given by the equation (1), and the output R _h (t) of the correlator is given by the equation (2).

S42. The first averaging means averages the correlation value over a predetermined number of slots. S43. The threshold calculation means calculates a threshold for valid path determination using the output of the first averaging means. Threshold is L
Assuming that the constant obtained by the experiment is X and X is ₁ , the threshold value L
₁ is represented by the equation (3).

S44. The comparing means compares the output amplitude of the first averaging means with the output amplitude of the threshold calculating means, and when the output amplitude of the first averaging means is equal to or larger than the output amplitude of the threshold calculating means, the first averaging means. Send the output of. S45. The delay dispersion calculating means calculates the delay time of the effective path and the dispersion of the delay time for each output of the effective path detecting device.

S46. The third averaging means averages the delay times output by the delay dispersion calculating means for a predetermined period. S47. The magnitude comparing means compares the magnitudes of the delay variances output by the plurality of delay variance calculating means, selects the sector having the smallest delay variance, and selects the average value of the delay times of the same sectors as the selected sectors. Instruct the selector.

According to this instruction, the sector used for the path search and the average value of the delay time of the sector are selected. S48. On the other hand, the valid path determination means that constitutes the migration determination device determines whether or not there is at least one valid path information in the outputs of the plurality of valid path detection devices. If there is no valid path information (No), the process is once terminated and the above valid path detection is tried again.

S49. In step S48, if there is only one piece of valid path information (Yes), the transition determination device outputs a transition determination enable signal that prompts the path search window determination device to perform the path search window determination process. S50. In the selected sector, the processing is temporarily ended with a predetermined time width around the average value of the delay times as a path search window.

That is, in the fourth embodiment of the present invention, the correlation value of the desired value of the plurality of paths of the desired station, the interference wave of the plurality of paths of the plurality of interfering stations, and the noise radio wave are superposed. When the average amplitude exceeds the threshold value, it is judged that there may be an effective path, and the sector with a large delay dispersion of the effective path for each sector is used as the sector for path search, and the average of the delay time is centered on the sector. A predetermined time width is determined as the path search window.

Therefore, even if there are many valid paths, the most probable sector can be selected, and the time position of the path search window can be adaptively and finely determined. The reliability of can be further improved. Although FIG. 4 shows the sector selecting device replaced in the first embodiment of the present invention, the sector selecting device may be replaced in the second embodiment of the present invention.

FIG. 3 is a basic configuration of the third and fifth embodiments of the present invention, FIG. 11 is a configuration of a sector selection device (No. 1) in the fifth embodiment of the present invention, and FIG. FIG. 13 is a diagram showing a configuration (No. 2) of the sector selection device in the fifth embodiment of the present invention, and FIG. 13 is a diagram showing a function and a schematic configuration of the first averaging means. That is, FIG. 3, FIG. 11 or FIG.
The combination of FIG. 13 clarifies the configuration of the fifth embodiment of the present invention.

In FIG. 3, reference numeral 1 denotes an effective path detecting device for detecting and outputting information on the timing of the effective path and the amplitude of the effective path, which is a spreading code same as the spreading code used on the transmitting side and a received signal. Correlator 11 that takes a correlation, first averaging means 12 that calculates the average value of the output of correlator 11, and threshold calculation means that calculates a threshold value for detecting an effective path from the output of first averaging means 12. 13, first averaging means 12
When the amplitude of the output of 1 exceeds the amplitude of the output of the threshold value calculation means 13, the timing of the effective path and the comparison means for outputting the amplitude of the effective path are provided.

Reference numeral 2c is a sector selection device for selecting the output of the effective path detecting device corresponding to a specific sector from the outputs of the plurality of effective path detecting devices, and has the structure shown in FIG. 11 or FIG. That is, in the case of FIG. 11, a weighting factor storage means (abbreviated as “weighting factor” in the figure, which stores the weighting factor for the amplitude of the effective path for each output of the effective path detecting device, is the same. The same applies to the following.) 26, 26a and 26b, and multipliers 27, 27a and 27 for multiplying the output of the effective path detection device by a weighting coefficient.
b, summing means 22, 22a and 22b for obtaining the sum total of the amplitudes of the effective paths weighted for a predetermined period for each output of a plurality of multipliers, a magnitude comparing means 23 and a magnitude comparing means for comparing the outputs of the plurality of summing means. The sector selection device 2c is configured by the selector 21 that selects one of the outputs of the plurality of valid path detection devices by using the output of 23 as a selection signal.
Further, in the case of FIG. 12, weighting coefficient storage means 28, 28a and 28b storing the weighting coefficient for the delay of the effective path for each output of the effective path detecting apparatus, and the output of the effective path detecting apparatus is multiplied by the weighting coefficient. Multipliers 27, 27a and 27 for
b, delay dispersion calculating means 24, 24 for obtaining delay dispersion of an effective path weighted for a predetermined period for each output of a plurality of multipliers
a and 24b, a magnitude comparison means 23 for comparing the outputs of a plurality of delay dispersion calculation means, and a selector 21 for selecting one of the outputs of a plurality of effective path detection devices using the output of the magnitude comparison means 23 as a selection signal. The selection device 2c is configured.

FIG. 20 is a flow chart (No. 1) showing the operation of the fifth embodiment of the present invention, and FIG. 21 is a flow chart (No. 2) showing the operation of the fifth embodiment of the present invention. . The operation of the fifth embodiment of the present invention will be described below with reference to the reference numerals of FIGS. 20 and 21. First, FIG.
The case is as follows.

S51. The correlator obtains a correlation value with the received signal using a specific spreading code, and inputs the correlation value to the first averaging means. Here, the received signal R (t) is given by the equation (1), and the output R _h (t) of the correlator is given by the equation (2).
Given in. S52. The first averaging means averages the correlation value over a predetermined number of slots.

S53. The threshold calculation means calculates a threshold for valid path determination using the output of the first averaging means. When the threshold value is L ₁ and the constant obtained by the experiment is X, the threshold value L ₁ is expressed by the equation (3). S54. The comparing means compares the output amplitude of the first averaging means with the output amplitude of the threshold calculating means, and when the output amplitude of the first averaging means is equal to or larger than the output amplitude of the threshold calculating means, the first averaging means. Send the output of.

S55. The multiplier multiplies the weight coefficient for each output of the effective path detection device. S56. The summing means adds the amplitudes of the valid paths for a predetermined period for each output of the valid path detecting device. S57. The magnitude comparing means compares the magnitudes of the sums output by the plurality of summing means, and instructs the selector to select the sector having the largest sum. According to this instruction, the sector used for the path search is selected.

S58. On the other hand, the valid path determining means that constitutes the migration determining device outputs 1 to the outputs of the plurality of valid path detecting devices.
It is determined whether there is any valid path information. If there is no valid path information (No), the process is once terminated and the above valid path detection is tried again. S59. In step S58, if there is only one piece of valid path information (Yes), the migration determination device outputs a migration determination enable signal that prompts the path search window determination device to perform the path search window determination processing.

S60. The path search window determination device counts the number of effective paths for each segment for the sector selected in step S57. S61. The segment having the largest number of valid paths for each segment is determined to be the path search window, and the processing is temporarily terminated. Then, in the case of FIG. 21, it is as follows.

S51 '. The correlator obtains a correlation value with the received signal using a specific spreading code, and inputs the correlation value to the first averaging means. Here, the received signal R (t) is given by the equation (1), and the output R _h (t) of the correlator is given by the equation (2).
Given in. S52 '. The first averaging means averages the correlation value over a predetermined number of slots.

S53 '. The threshold calculation means calculates a threshold for valid path determination using the output of the first averaging means. When the threshold value is L ₁ and the constant obtained by the experiment is X, the threshold value L ₁ is expressed by the equation (3). S54 '. The comparing means compares the output amplitude of the first averaging means with the output amplitude of the threshold calculating means, and when the output amplitude of the first averaging means is equal to or larger than the output amplitude of the threshold calculating means, the first averaging means. Send the output of.

S55 '. The multiplier multiplies the weight coefficient for each output of the effective path detection device. S56 '. The delay dispersion calculating means calculates the dispersion of the delay time of the effective path for each output of the effective path detecting device for the amplitude for a predetermined period. S57 '. The magnitude comparison means compares the magnitudes of the delay variances output by the plurality of delay variance calculation means, and instructs the selector to select the sector with the greatest delay variance. According to this instruction, the sector used for the path search is selected.

S58 '. On the other hand, the valid path determination means that constitutes the migration determination device determines whether or not there is at least one valid path information in the outputs of the plurality of valid path detection devices. If there is no valid path information (No), the process is once terminated and the above valid path detection is tried again. S59 '. In step S58 ', if there is only one piece of valid path information (Yes), the transition determining device outputs a transition determination enable signal that prompts the path search window determining device to perform the path search window determining process. .

S60 '. The path search window determination device counts the number of effective paths for each segment for the sector selected in step S57 '. S61 '. The segment having the largest number of valid paths for each segment is determined to be the path search window, and the processing is temporarily terminated. That is, in the fifth embodiment of the present invention, when the average amplitude of the correlation value exceeds the threshold value, it is determined that there may be an effective path, and the sum of the weighted effective path amplitudes for each sector or the weighted effective path delay. A sector having a large variance is used as a sector used for path search, and a segment having the largest number of effective paths on the sector is determined as a path search window.

Therefore, when a sector having a large sum of amplitudes of effective paths for each sector is used as a sector for path search, there are many effective buses and the most probable sector is when the delay spread is large. Can be selected to increase the reliability of the path search window. Also, when a sector with a large effective path delay dispersion for each sector is used for the path search, it is possible to select the most probable sector even if many effective paths exist. The reliability of the search window can be increased.

Although FIG. 3 shows the sector selecting device replaced in the first embodiment of the present invention, the sector selecting device may be replaced in the second embodiment of the present invention. Good. 5 is a basic configuration of a sixth embodiment of the present invention, FIG. 7 is a configuration of a sector selection device according to the first, second, sixth and seventh embodiments of the present invention, and FIG. FIG. 5 is a diagram showing the function and schematic configuration of one averaging means, and FIG.
The combination of FIGS. 7 and 13 clarifies the configuration of the first embodiment of the present invention.

In FIG. 5, reference numeral 1b is an effective path detecting device for detecting and outputting information on the timing of the effective path and the amplitude of the effective path, which is the same as the spreading code used on the transmitting side and the received signal. Correlator 11 for correlating, correlator 11
Of the output of the first averaging means 12, a first averaging means 12 for calculating an average value of the outputs of the first averaging means, a threshold setting means 16 for presetting a threshold value for detecting effective path timing, The comparison means 14 is provided for outputting the timing of the effective path and the amplitude of the effective path when the amplitude of the output of the threshold value calculation means 16 is exceeded.

2 is 1 from the outputs of the plurality of effective path detecting devices.
A sector selection device that selects the output of one effective path detection device, that is, the output of the effective path detection device corresponding to a specific sector, and is configured by a selector 21 as shown in FIG. Reference numeral 3 denotes a transition determination device that determines transition to the path search window determination processing. In this case, when there is a possibility that a valid path exists even in one of a plurality of sectors, the valid path determination signal is set to enable transition determination. The effective path determination means 31 which outputs a signal is provided.

Reference numeral 4 denotes a path search window determining device which determines the path search window by using the outputs of the plurality of effective path detecting devices with the output of the effective path determining means 31 as the transition determining enable signal. The determination device 4 outputs sector information and segment information. Of these, the sector information is supplied as a selection signal to the selector 21 which constitutes the sector selection device 2.

Reference numeral 5 is a spread code generator which generates a spread code under the control of the sector information output from the sector selector 2, and 6 is a communication signal transmitted from the received signal by the spread code output from the spread code generator 5. Is a despreader for extracting. The output of the despreading device is the demodulation information. Here, the sector selection device 2, the transition determination device 3, the path search window determination device 4, the spreading code generation device 5, and the despreading device 6 are unique to one sector reception device.
That is, in FIG. 5, an effective path detecting device 1 included in a plurality of sector receiving devices, a sector selecting device 2, a transition determining device 3, a path search window determining device 4, and a spreading code generating device included in a single sector receiving device. 5 and the despreading device 6 are shown, of which the part excluding the spreading code generating device 5 and the despreading device 6 constitutes the path search window setting device of the present invention.

FIG. 22 is a flow chart showing the operation of the sixth embodiment of the present invention. The operation of the sixth embodiment of the present invention will be described below with reference to the reference numerals in FIG. S71. The correlator obtains a correlation value with the received signal using a specific spreading code, and inputs the correlation value to the first averaging means. Here, the received signal R (t) is given by the equation (1), and the output R _h (t) of the correlator is given by the equation (2).

S72. The first averaging means averages the correlation value over a predetermined number of slots. S73. The comparison means reads out the threshold value set in the threshold value setting means. S74. The comparing means compares the output amplitude of the first averaging means with the output amplitude of the threshold setting means, and when the output amplitude of the first averaging means is equal to or larger than the output amplitude of the threshold setting means, the first averaging means. Send the output of.

S75. The valid path determining means that constitutes the migration determining device determines whether or not there is at least one valid path information in the outputs of the plurality of valid path detecting devices. Valid path information is 1
If there is no problem (No), the process is once terminated and the above-described valid path detection is tried again. S76. In step S75, if there is only one piece of valid path information (Yes), the migration determination device outputs a migration determination enable signal that prompts the path search window determination device to perform the path search window determination processing.

S77, the path search window determination device
Valid path output by the valid path detection device corresponding to the sector
The number of valid paths is counted for each item of information. Count result for each sector
To N _SECTAnd S78. In addition, the path search window determination device uses the sector of each sector.
The number of valid paths is counted for each segment. By segment
Count result as N_SEGAnd

S79. The product of the count result N _{SECT for} each sector and the count result N _SEG for each segment is brute-forced, and the combination of the sector and segment that maximizes the product is determined to be the sector and segment used for path search. The process is once ended. That is, in the sixth embodiment of the present invention, the threshold value calculating means in the first embodiment is replaced with the threshold value setting means, and there may be an effective path when the average amplitude of the correlation value exceeds the set threshold value. It is determined that the timing at which the product of the number of effective paths for each sector and the number of effective paths for each segment is maximum is the most probable path timing, and the segment including the timing is determined as the path search window.

Therefore, there is no need to calculate the threshold,
The circuit scale and processing scale of the path searcher can be reduced. Although FIG. 6 shows a replacement of the valid bus detection device in the first embodiment of the present invention, the valid bus detection device in the second to fifth embodiments of the present invention is shown. The device may be replaced.

FIG. 6 is a basic configuration of the seventh embodiment of the present invention, and FIG. 7 is a configuration of a sector selection device according to the first, second, sixth and seventh embodiments of the present invention. 13 is a diagram showing the function and schematic configuration of the first averaging means, and the configuration of the seventh embodiment of the present invention will be clarified by the combination of FIG. 6, FIG. 7 and FIG. In FIG. 6, reference numeral 1 denotes an effective path detection device that detects and outputs information on the timing of the effective path and the amplitude of the effective path, and takes the correlation between the same spreading code used on the transmitting side and the received signal. Correlator 11 and correlator 1
The first averaging means 12 for calculating the average value of the output of 1, the threshold calculating means 13 for calculating the threshold for detecting the effective path from the output of the correlator 11, and the amplitude of the output of the first averaging means 12. Is provided with a comparing means 14 for outputting the timing of the effective path and the amplitude of the effective path when the value exceeds the amplitude of the output of the threshold value calculating means 13.

2 is 1 from the outputs of the plurality of effective path detecting devices.
A sector selection device that selects the output of one effective path detection device, that is, the output of the effective path detection device corresponding to a specific sector, and is configured by a selector 21 as shown in FIG. Reference numeral 3a is a transition determining device for determining transition to a path search window determination process. In this case, one of a plurality of sectors is selected.
A valid path determination means 31 that outputs a valid path determination signal when there is a possibility that any valid path exists, and a transition determination enable signal when the valid path determination means 31 continuously outputs the valid path determination signal a predetermined number of times. The continuous detection means 32 which outputs is provided.

Reference numeral 4 denotes a path search window determining device which determines the path search window by using the outputs of the plurality of effective path detecting devices with the output of the continuous detecting means 32 as an enable signal.
The path search window determination device 4 outputs sector information and segment information. Of these, the sector information is supplied as a selection signal to the selector 21 which constitutes the sector selection device 2.

Reference numeral 5 is a spread code generator which generates a spread code under the control of the sector information output from the sector selector 2, and 6 is a communication signal transmitted from the received signal by the spread code output from the spread code generator 5. Is a despreader for extracting. The output of the despreading device is the demodulation information. Similar to FIG. 1, FIG. 6 shows an effective path detecting device 1 included in a plurality of sector receiving devices, a sector selecting device 2, a transition determining device 3a, a path search window determining device 4 included in a single sector receiving device. A spreading code generating device 5 and a despreading device 6 are shown, and the part excluding the spreading code generating device 5 and the despreading device 6 constitutes the path search window setting device of the present invention.

FIG. 23 is a flow chart showing the operation of the seventh embodiment of the present invention. The operation of the seventh embodiment of the present invention will be described below with reference to the reference numerals of FIG. S81. The correlator obtains a correlation value with the received signal using a specific spreading code, and inputs the correlation value to the first averaging means. Here, the received signal R (t) is given by equation (1): the correlator output R _h (t) is given by equation (2).

S82. The first averaging means averages the correlation value over a predetermined number of slots. S83. The threshold calculation means calculates a threshold for valid path determination using the output of the first averaging means. Threshold is L
Assuming that the constant obtained by the experiment is X and X is ₁ , the threshold L
₁ is represented by the equation (3).

S84. The comparing means compares the output amplitude of the first averaging means with the output amplitude of the threshold calculating means, and when the output amplitude of the first averaging means is equal to or larger than the output amplitude of the threshold calculating means, the first averaging means. Send the output of. S85. The valid path determination means that constitutes the migration determination device,
It is determined whether or not there is at least one piece of valid path information in the outputs of the plurality of valid path detecting devices.

If there is no valid path information (No), the process is once terminated and the above-mentioned valid path detection is tried again. S86. In step S85, if there is even one piece of valid path information (Yes), the valid path determination means outputs a valid path determination signal. The continuous detection means holds the valid path determination signal.

After that, the process jumps to step S82 and the processes of steps S82 to S86 are repeated. S87. After the elapse of the predetermined time, the continuous detection means determines whether or not the valid path determination signal is continuously output a predetermined number of times. When the valid path determination signal has not been output a predetermined number of times continuously (No), the processing is temporarily terminated.

S88. Valid path determination in step S87
When the signal is continuously output a predetermined number of times (Yes),
The continuous detection means outputs a transition determination enable signal. S89, the path search window determination device compares each sector with
Yes for each valid path information output by the corresponding valid path detector
Count the number of effective passes. N count result for each sector _SECTTosu
It

S90. Also, the path search window determination device is
The number of valid paths is counted for each segment of each sector. The count result for each segment is N _SEG . S91. The product of the count result N _{SECT for} each sector and the count result N _SEG for each segment is brute-forced, and the combination of the sector and segment that maximizes the product is determined to be the sector and segment used for path search. The process is once ended.

That is, in the seventh embodiment of the present invention, the transition to the path search is enabled when the first enable signal is continuously output a predetermined number of times in the first embodiment. Even if the correlation value between the communication signal or noise radio wave of the interfering station and the spreading code of the desired station accidentally exceeds the correlation value between the communication signal of the desired station and the spreading code of the desired station and shows the maximum value, Immediately pass the timing showing the maximum value
The risk of erroneous recognition of timing is further reduced, and the reliability of path search can be further improved.

Although FIG. 6 shows the replacement of the migration determining device in the first embodiment of the present invention,
The migration determination device may be replaced in the second to sixth embodiments of the present invention. (Supplementary Note 1) A correlator that correlates the same spread code as the spread code used on the transmission side with the received signal, and a first averaging means that averages the correlation values output by the correlator over a predetermined period. A threshold value calculating means for calculating a threshold value using a correlation value output by the correlator, and an average value comparing the average value output by the first averaging means with a threshold value output by the threshold value calculating means. A plurality of valid path detecting devices having a timing that exceeds the threshold and the average value and comparing means for suggesting the possibility of existence of a valid path for each sector, and common to all valid path detecting devices, A transition determination device that determines the transition to the path search window determination process when there is a possibility that even one of the plurality of sectors has a valid path in response to the output of each valid path detection device, and a valid path for each sector. Depending on the number and timing of valid paths Sector used for path search and the path that determines the path search window in the sector
1. A path search window setting device comprising: a search window determining device; and a sector selecting device including a selector for selecting an output of an effective path detecting device corresponding to a sector determined by the bus search window determining device.

(Supplementary Note 2) In the path search window setting device according to supplementary note 1, second averaging means for averaging the output of the comparing means over a predetermined number of times is further added to each of the valid path detecting devices. A path characterized by
Search window setting device.

(Supplementary Note 3) In the path search window setting device according to either Supplementary Note 1 or Supplementary Note 2, instead of the sector selecting device, the effective path detecting device at the effective timing is effective for each effective path detecting device. Either a summing means for calculating the sum of outputs or a delay dispersion calculating means for calculating the dispersion of delay times of effective timing, and a magnitude comparison means for comparing the output of either the summing means or the delay dispersion calculating means, A sector selection device including a selector for selecting the output of the effective path detection device corresponding to the output of the magnitude comparison means is arranged, and the operation is started by the output of the transition determination device instead of the bus search window determination device. , A path search window determining device for determining a path search window according to the timing of an effective path in a sector selected by the sector selecting device A path search window setting device characterized by arranging.

(Supplementary Note 4) In the path search window setting device according to Supplementary Note 3, when the sector selection device includes the delay dispersion calculation means, the sector selection device includes the delay dispersion calculation means and the delay dispersion calculation means. A third averaging means for averaging the output of the calculating means, a magnitude comparing means for comparing the outputs of the third averaging means, and an output of the effective path detecting device corresponding to the output of the magnitude comparing means, A path search window setting device comprising a selector for selecting.

(Supplementary Note 5) In the path search window setting device according to either Supplementary Note 3 or Supplementary Note 4, the summing means calculates the sum of the outputs of the valid path detecting devices at valid timing for each valid path detecting device. In the calculation, weighting corresponding to the amplitude of the received signal is performed for each output of the effective path detecting device, and when the delay dispersion calculating means calculates the dispersion of the delay time of the effective timing, the delay time is weighted. Path search window setting device.

(Supplementary note 6) In the path search window setting device according to any one of supplementary notes 1 to 5, the effective path detecting device sets a threshold value in advance instead of the threshold value calculating means. A path search window setting device comprising means.

(Supplementary Note 7) In the path search window setting device according to any one of supplementary notes 1 to 6, when the transition determining device determines to transit to the path search window determining process continuously a predetermined number of times. A path search window setting device comprising: continuous detection means for outputting an enable signal to the path search window determination device.

[0139]

As described above in detail, according to the present invention, in a path search window setting device of a cellular communication system to which a code division multiple access system is applied as a multiple access system, a mobile station which a base station desires to communicate with. When detecting the path timing, which is the absolute reference time of the base station that is required when receiving the signal transmitted from, and despreading it to the baseband signal, it is possible to accurately detect the path timing and Even if the timing may change with the movement of the mobile station, a time window for tracking the changing path timing, that is, a path search window for which a narrow path search window can be set
A search setting device can be realized.

That is, according to the first aspect of the invention, the averaging means for averaging the correlation values output by the correlator for each sector receiving device over a predetermined time and the average value output by the averaging means are used as received signals. And a threshold value calculated based on the average value that exceeds the threshold value is determined as a path timing with a high possibility that an effective path exists. Even if the correlation value with the noisy radio wave becomes large, the influence of the correlation value at this timing is reduced by averaging, and the risk of erroneously recognizing the path timing is reduced. Further, since the number of effective paths for each sector is referred to when determining the path search window, more reliable diversity reception becomes possible.

According to the second invention, in the path search window setting device of the first invention, the output of the comparing means is averaged over a predetermined number of times for each of the valid path detecting devices. Since the averaging means is added, even if the correlation value with the interfering radio wave or the noise radio wave is accidentally increased, the influence of the correlation value of this timing is further reduced, and the possibility of erroneously recognizing the path timing is further increased. Less.

According to the third aspect of the invention, the summing means for calculating the sum of the outputs of the effective path detecting devices at the effective timing for each of the effective path detecting devices or the delay dispersion for calculating the dispersion of the delay times of the effective timings. It comprises any one of the calculating means, a magnitude comparing means for comparing the output of either the summing means or the delay variance computing means, and a selector for selecting the output of the effective path detecting device corresponding to the output of the magnitude comparing means. A sector selection device is arranged, and an operation is started by the output of the migration determination device, and a path search window determination device is arranged to determine the path search window according to the number of effective paths in the slot selected by the sector selection device. Therefore, when the summing means is provided, the sector is accurately selected when there are many effective paths or when the delay spread is large. It can be, can be reduction of the amount of processing since the sector select device may be determined path search window for the selected sector path search window determining unit. Further, when the delay dispersion calculation means is provided, it is possible to obtain a measure of the extent of the temporal position where an effective path exists, and it is possible to efficiently determine the path search window.

Further, according to the fourth invention, the sector selection device includes the delay dispersion calculating means, a third averaging means for averaging the outputs of the delay dispersion calculating means, and the third averaging means. Since it comprises a magnitude comparing means for comparing the outputs of the digitizing means and a selector for selecting the output of the valid path detecting device corresponding to the output of the magnitude comparing means, the path search window is centered on the average of the delay times of the valid paths. You can open the path
The position of the search window can be adaptively determined.

Further, according to the fifth invention, since the summing means weights the amplitude when calculating the sum of the outputs of the effective path detecting devices at the effective timing for each of the effective path detecting devices, the effective path It becomes possible to determine the path search window by adding the size to the judgment material, and the path search window can be accurately determined. In addition, since the delay dispersion calculation means weights the delay time when calculating the dispersion of the delay time of the effective timing, it becomes possible to obtain a measure of the extent of the temporal position where the effective path exists. The path search window can be efficiently and accurately determined.

[Brief description of drawings]

FIG. 1 is a basic configuration of a first embodiment of the present invention.

FIG. 2 is a basic configuration of a second embodiment of the present invention.

FIG. 3 is a basic configuration of third and fifth embodiments of the present invention.

FIG. 4 is a basic configuration of a fourth embodiment of the present invention.

FIG. 5 is a basic configuration of a sixth embodiment of the present invention.

FIG. 6 is a basic configuration of a seventh embodiment of the present invention.

FIG. 7 is a configuration of a sector selection device according to the first, second, sixth and seventh embodiments of the present invention.

FIG. 8 is a configuration (1) of a sector selection device according to a third embodiment of the present invention.

FIG. 9 is a configuration (part 2) of the sector selection device according to the third embodiment of the present invention.

FIG. 10 is a configuration of a sector selection device according to a fourth embodiment of the present invention.

FIG. 11 is a configuration (1) of a sector selection device according to a fifth embodiment of the present invention.

FIG. 12 is a configuration (part 2) of the sector selection device according to the fifth embodiment of the present invention.

FIG. 13 is a diagram showing a function and a schematic configuration of a first averaging means.

FIG. 14 is a diagram for explaining segment determination.

FIG. 15 is a flowchart showing the operation of the first embodiment of the present invention.

FIG. 16 is a flowchart showing the operation of the second embodiment of the present invention.

FIG. 17 is a flowchart (part 1) showing the operation of the third embodiment of the present invention.

FIG. 18 is a flowchart (part 2) showing the operation of the third embodiment of the present invention.

FIG. 19 is a flowchart showing the operation of the fourth embodiment of the present invention.

FIG. 20 is a flowchart (1) showing the operation of the fifth embodiment of the present invention.

FIG. 21 is a flowchart (part 2) showing the operation of the fifth embodiment of the present invention.

FIG. 22 is a flowchart showing the operation of the sixth embodiment of the present invention.

FIG. 23 is a flowchart showing the operation of the seventh embodiment of the present invention.

FIG. 24 is a conventional path search window setting device.

[Explanation of symbols]

1, 1a, 1b, 1c Effective path detection device 2, 2a, 2b, 2c sector selection device 3, 3a Transition determination device 4, 4a, 4b, 4c Path search window determination device 5 Spread code generator 6 despreader 11 Correlator 12 First averaging means 13 Threshold calculation means 14 Comparison means 15 Second averaging means 16 threshold setting means 17 Maximum value detection means 21, 21a selector 22, 22a, 22b Summing means 23 Large and small comparison means 24, 24a, 24b Delay dispersion calculation means 25, 25a, 25b Third averaging means 26, 26a, 26b Weighting coefficient storage means 27, 27a, 27b Multiplier 28, 28a, 28b Weighting coefficient storage means 12-1 Adder 12-2 Divider 101 desired station 102, 103 Interfering station

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Morihiko Minowa             4-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa             No. 1 within Fujitsu Limited F term (reference) 5K022 EE02 EE32                 5K067 AA15 BB02 CC10 DD25 EE02                       EE10 GG01 GG11 HH21

Claims (5)

[Claims] 1. A correlator for correlating the same spreading code as that used on the transmitting side with a received signal, and a first averaging means for averaging the correlation values output by the correlator over a predetermined period. A threshold value calculation means for calculating a threshold value for valid path detection using the correlation value output by the correlator, and the threshold value output by the threshold value calculation means for an average value output by the first averaging means. And a plurality of valid path detection devices each having a comparison unit that outputs a timing when the average value exceeds the threshold value and outputs the average value to indicate the possibility of existence of a valid path for each sector, Common to all valid path detection devices, a migration decision is made to receive the output of each valid path detection device and decide to migrate to a path search window decision process when there is a possibility that a valid path exists even in one of a plurality of sectors. Device and number of valid paths for each sector and valid A sector used for path search, a path search window determining device for determining a path search window in the sector, and an effective path detecting device corresponding to the sector determined by the path search window determining device. A path search window setting device comprising: a sector selection device including a selector for selecting an output. 2. The path search window setting device according to claim 1, further comprising a second averaging means for averaging the output of the comparing means over a predetermined number of times for each of the valid path detecting devices. Path search window setting device characterized by: 3. The path search window setting device according to claim 1, wherein, instead of the sector selection device, the effective path detection device has an effective timing for each effective path detection device. Either a summing means for calculating the sum of outputs or a delay dispersion calculating means for calculating the dispersion of delay times of effective paths, and a magnitude comparison means for comparing the output of either the summing means or the delay dispersion calculating means, A sector selection device including a selector for selecting the output of the effective path detection device corresponding to the output of the magnitude comparison means is arranged, and the operation is started by the output of the transition determination device instead of the bus search window determination device. , Arranging a path search window determining device that determines a path search window according to the timing of an effective path in the sector selected by the sector selecting device The path search window setting device which is characterized the door. 4. The path search window setting device according to claim 3, wherein when the sector selection device includes the delay dispersion calculation means, the sector selection device includes the delay dispersion calculation means and the delay dispersion calculation means. A third averaging means for averaging the delay time output by the means, a magnitude comparing means for comparing the outputs of the delay variance calculating means, and an output of the effective path detecting device corresponding to the output of the magnitude comparing means. A path search window setting device comprising a selector for selecting. 5. The path search window setting device according to claim 3 or 4, wherein the summing means calculates a sum of outputs of the valid path detecting devices at valid timing for each of the valid path detecting devices. When calculating, the weighting corresponding to the amplitude of the received signal is performed for each output of the effective path detecting device, and when the delay dispersion calculating means calculates the dispersion of the delay time of the effective timing, the delay time is weighted. A path search window setting device characterized in that