JP2002050983A - Cdma reception equipment and path detection control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable optimal high-speed path detection and high-speed follow-up control for CDMA reception equipment and path detection control method. SOLUTION: This CDMA reception equipment includes a searcher unit 3 which inputs intermediate frequency signals corresponding to sectors of a predetermined number, a finger unit 4 which inputs intermediate frequency signals corresponding to sectors selected by the searcher unit 3 to conduct inverse spread processing and synchronous detection processing, and an MRC unit 5 which conducts maximum ratio synthesis for demodulated data for each finger of the finger unit 4. Then, a synchronous detection unit 6 which inputs demodulated data for each finger of the finger unit 4 to conduct synchronous detection corresponding to the sectors is provided, and the searcher unit 3 has a configuration that conducts path follow-up control with shorter search interval or increased number of times of path averaging during detection of synchronous state by the synchronous detection unit 6, and conducts path nonfollow-up control with longer search interval or less number of times of path averaging during detection of asynchronous state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CDMA (Code
A CD that detects an optimal path in a multipath environment in a mobile communication system to which the Division Multiple Access method is applied and enables high-speed pull-in and high-speed path following control.
The present invention relates to an MA receiver and a path detection control method.

[0002]

2. Description of the Related Art FIG.
C of base station in mobile communication system to which system A is applied
101-1 shows a main part of the DMA receiving apparatus;
1-N is an antenna corresponding to a plurality of sectors 1 to N, 102 is a reception processing unit, 103 and 104 are selectors, 105 is a searcher unit, 106 is a finger unit, 107 is an MRC unit that performs rake combining, and 108 is a common synchronization detection. Indicates a part. The reception processing unit 102 includes sector-specific antennas 101-1 to 101-1.
-N, the I and Q signals of the intermediate frequencies obtained by quadrature demodulating the received signals are converted into digital signals,
Input to 03 and 104. The searcher unit 105 and the finger unit 106 have a configuration for processing in a time-division manner.

The selector 103 is controlled by a selection setting signal from a control unit (not shown) to select I and Q signals corresponding to a maximum of M (<N) sectors out of N sectors, and Input to the unit 105. This searcher part 10
Numeral 5 has a configuration including a matched filter (MF) and a profile memory, obtains a correlation value between I and Q signals corresponding to the selected M sectors and a spreading code by a matched filter, and obtains the plurality of correlation values. Is stored in the profile memory. And
L paths are selected in descending order of correlation value to notify the selector 104 of a single or a plurality of selected sectors.
The path timing for each finger of the finger unit 106 including the fingers 1 to L is notified.

Each finger of the finger unit 106 generates a spreading code according to the path timing from the searcher unit 105, performs despreading processing, performs synchronous detection processing, outputs demodulated data, and outputs L demodulated data. The demodulated data is input to the MRC unit 107 to perform rake combining by maximum ratio combining. Also, the common synchronization detection unit 108
Synchronization detection is performed using pilot symbols of the combined output data from RC section 107, and the detection result is reported to searcher section 105. The synchronization detection signal is used as a synchronization signal for processing the rake-combined demodulated data.

The searcher unit 105 moves a search window (a timing section in which a path can be detected) following a movement of a maximum correlation value (a maximum path timing). Also, as described above, the common synchronization detecting unit 108
The synchronization detection is performed using the pilot symbols after the rake combining by the C unit 107, and the searcher unit 105 controls to perform the path following operation in the synchronous state and to stop the path following operation in the asynchronous state. ing.

[0006]

In a mobile communication system, the delay profile obtained in searcher section 105 changes as the mobile station that is communicating with the base station moves. Therefore, the searcher unit 105 performs path tracking control for moving the search window by following the timing fluctuation of the maximum correlation value. However, in a transmission off section of a burst signal or a section or a sector where no effective path exists, a path having a large correlation value may be recognized by chance due to an interference wave or noise. Shifts. Therefore, when the burst signal is received during the transmission ON period, the effective path is shifted from within the search window.
There is a problem that high-speed detection of a normal path cannot be performed.

[0007] Further, since the common synchronization detecting section 108 performs synchronization detection using pilot symbols after rake combining, it means that synchronization is detected as a channel. Then, according to the synchronization detection result, the searcher unit 1
The on / off operation of the path tracking control in step 05 is performed. When a plurality of sectors are received, the situation of the valid path differs depending on the sector, and the path following control may be performed on a sector having no valid path. However, there is a problem that causes a malfunction. Further, the number of synchronization protection stages is fixedly set in advance, and does not follow changes in the environment. Therefore, there is a problem that the time required for synchronization pull-in becomes longer or the possibility of false synchronization detection increases. .

An object of the present invention is to solve the problems of the conventional example, and to enable high-speed detection of an optimal path and high-speed follow-up control of an optimal path.

[0009]

Referring to FIG. 1, the CDMA receiver according to the present invention includes a searcher unit 3 and a finger unit 4, and includes a predetermined number of sectors in a received signal corresponding to a plurality of sectors. A corresponding received signal is selected by the selector 1 and input to the searcher unit 3, a correlation value with the spreading code is obtained, and the control is performed to follow the path of the maximum path timing among the path timings according to the correlation value, and A CDMA receiving apparatus for performing a despread demodulation process in a unit 4. The CDMA receiver receives demodulated data of a finger unit 4 corresponding to a maximum path timing corresponding to a sector by a searcher unit 3, detects synchronization, and detects a searcher in a synchronized state. A synchronization detection unit 6 is provided for performing the path following control in the unit 3 and for stopping the path following control in the searcher unit 3 in an asynchronous state.

A demodulation data obtained by rake-combining demodulation data of each finger of the finger unit 4 by the MRC unit 5 is inputted, and a common synchronization detection unit for detecting synchronization as a channel is provided. The synchronization detection unit 6 for inputting data has a configuration for switching a parameter for performing synchronization detection corresponding to a sector in accordance with the synchronization detection result of the common synchronization detection unit. , One or both of the search interval and the number of times of path averaging are switched. A demodulation data obtained by rake-combining the demodulation data of each finger of the finger unit 4 is input, and an SIR measuring unit for measuring a signal-to-interference-wave power ratio is provided. The configuration may be such that the synchronization detection parameter is switched correspondingly.

Further, according to the path detection control method of the present invention, a correlation value with a spreading code is obtained by inputting a reception signal corresponding to a predetermined number of sectors among reception signals corresponding to a plurality of sectors, and a path according to the correlation value is determined. A path detection control method for controlling a path following a path having a maximum path timing in timing, wherein demodulated data of a finger unit corresponding to a maximum path timing corresponding to a sector by a searcher unit is input and synchronously detected for a sector,
The method includes a step of causing the searcher unit to perform path following control in a synchronous state, and stopping the path following control in the searcher unit in an asynchronous state. Also, based on the demodulated data obtained by combining the demodulated data of the fingers at the maximum ratio,
Perform synchronization detection or signal wave to interference wave power ratio measurement, and in response to the synchronization detection result or signal wave to interference wave power ratio measurement result,
The method may include a step of inputting demodulated data of the finger corresponding to the maximum path timing corresponding to the sector by the searcher unit and switching a synchronization detection parameter for performing synchronous detection corresponding to the sector.

[0012]

FIG. 1 is an explanatory view of a first embodiment of the present invention. Reference numerals 1 and 2 denote selectors, reference numeral 3 denotes a searcher unit,
4 is a finger part, 5 is an MRC part, 6 is a synchronization detection part, 10
Indicates an IF (intermediate frequency) unit. Also, a case is shown in which the number of sectors N = 6, the maximum number of sectors M to detect paths in the searcher unit 3 = 4, and the number of fingers L of the finger unit 4 = 8. An IF section 10 indicated by a dotted line inputs a signal obtained by orthogonally demodulating the received signals corresponding to sectors 1 to 6 by a high-frequency section (not shown), and converts intermediate frequency I and Q signals converted into digital signals into selectors 1 and 2. To enter.

The selector 1 is controlled by a selection setting signal from a control unit (not shown), selects I and Q signals corresponding to up to four sectors out of six sectors, and inputs them to the searcher unit 3. Then, the selector 2 responds to the notification of the selected sector from the searcher unit 3 by using I,
The Q signal is input to the finger unit 4. Finger part 4 is 8
In the case of a finger configuration, generation of a spreading code, despreading processing, and synchronous detection processing are performed in accordance with the path timing from the searcher unit 3, and demodulated data from each finger is subjected to MRC.
Input to section 5. The MRC unit 5 performs rake combining by the maximum ratio combining of the demodulated data corresponding to the finger, as in the conventional example, and transfers the rake combined data to a subsequent processing circuit (not shown). In this case, since the subsequent processing circuit needs to process the demodulated data in synchronization with the pilot symbol of the demodulated data from the MRC unit 5, a common synchronization detecting unit (not shown) is provided.

The searcher unit 3 obtains, using a matched filter (MF), correlation values of I and Q signals corresponding to a maximum of four sectors selected by the selector 1, and stores a delay profile including a peak of the correlation value in a profile memory. Then, eight paths having a large correlation value among them are selected, a selection signal indicating a sector including the eight paths is notified to the selector 2, and the path timing of the eight paths is determined by the finger section 8 of the finger section 4. Notify fingers. Further, the synchronization detection unit 6 is notified of the finger number of the finger unit 4 to which the maximum path timing corresponding to the sector selected by the selector 2 is allocated.

[0015] The synchronization detecting section 6 detects synchronization using pilot symbols of demodulated data from the fingers corresponding to the finger numbers notified from the searcher section 3. That is,
The synchronization detection is performed by using the pilot symbols of the demodulated data of the fingers that demodulate the signal corresponding to the sector selected by the selector 2. The synchronization detection is performed on the sector selected by the selector 2. The synchronization detection result is notified to the searcher unit 3. Synchronization detection parameters (tolerance, number of forward protection steps, number of rear protection steps)
Can be set in sector units. For example, if the parameters of the synchronization detection in the channel unit in the conventional example are tolerance = 8, the number of forward protection stages = 2, and the number of rear protection stages = 10, the synchronization detection parameter in the sector unit is hardly determined to be out of synchronization. In order to facilitate the establishment determination, for example, the tolerance can be set to 4, the number of front protection steps = 4, and the number of rear protection steps = 5.

The searcher unit 3 performs path tracking control at the time of synchronization in accordance with the synchronization detection result from the synchronization detection unit 6,
When asynchronous, the path follow-up control is stopped. Then, the search interval or the number of times of averaging for obtaining the correlation value is switched between the path following control and the path non-tracking control. That is, during the path following control, the search interval is shortened. Alternatively, increase the number of times of averaging. Conversely, at the time of the path non-following control, the search interval is lengthened to broaden the search window equivalently. Alternatively, the number of times of averaging is reduced, the update cycle of the profile memory is shortened, and the speed of path detection is increased.

FIG. 2 is an explanatory view of a main part of an embodiment of a searcher section according to the present invention. FIG. 2 shows a main part configuration corresponding to one sector of the searcher section 3 of FIG. ,
Reference numeral 12 denotes a code generation unit, 13 denotes an averaging processing unit, 14 denotes a search control unit, 15 denotes a memory control unit, and 16 denotes a profile memory.

The MF correlation value detector 11 has a matched filter (MF) configuration, and has an intermediate frequency (I
F) A correlation value between the signal and the spread code from the code generator 12 is obtained. The correlation value is averaged, for example, for a plurality of frames by the averaging unit 13 and stored in the profile memory 16 under the control of the memory control unit 15. Based on the data stored in the profile memory 16, path selection is performed by path selection means (not shown).

The search control unit 14 controls the MF correlation value detection unit 11, the code generation unit 12, and the memory control unit 15 to switch the window or interval, that is, the search window or search interval. The search control unit 14 and the memory control unit 15
The tracking ON / OFF signal to be added to the above is a signal of a synchronization detection result from the synchronization detection unit 6 (see FIG. 1).

When the tracking is OFF, it is necessary to perform path detection over a wide range. Therefore, it is conceivable to enlarge the search window. In this case, if the search intervals are the same, the capacity of the profile memory 16 needs to be increased. Therefore, if the search interval is set to X times the tracking ON when the tracking is OFF, the timing accuracy of the path detection is deteriorated, but the detection range (search window) is X times even if the capacity of the profile memory 16 is the same. For example, if X = 2 and the search interval is doubled, the detection range can be doubled without increasing the capacity of the profile memory 16. That is, the following O
By switching the search interval according to the N / OFF signal, the search control unit 14 can speed up synchronous detection from an asynchronous state.

FIG. 3 is an explanatory view of a main part of another embodiment of the searcher section of the present invention. As in FIG. 2, a main part configuration corresponding to one sector of the searcher section 3 of FIG. 1 is shown. 21 is M
F correlation value detector, 22 a code generator, 23 an averaging processor, 24 a search controller, 25 a memory controller, 26
Indicates a profile memory.

The searcher unit of this embodiment has a tracking ON
/ OFF signal to the averaging unit 23 and the memory control unit 25 to control the switching of the number of times of averaging,
6 shows the case where the storage processing control is performed. When the follow-up is ON, the number of times of averaging in the averaging unit 23 is increased to increase the path detection accuracy. When the follow-up is OFF, the path detection is performed at high speed. To do so, the number of times of averaging is reduced, and the update cycle of the profile memory 26 is shortened. Also in this case, the path detection can be performed with the capacity of the profile memory 26 being the same. As shown by the dotted line, the search control unit 24
A follow-on / off signal is also input to control the path follow-up control when the follow-up is ON and not to perform the path follow-up control when the follow-up is OFF.

FIG. 4 is an explanatory view of a main part of still another embodiment of the searcher section of the present invention. Similar to FIGS. 2 and 3, a main section corresponding to one sector of the searcher section 3 of FIG. 31 shows the configuration, 31 is an MF correlation value detector, 32 is a code generator, 3
Reference numeral 3 denotes an averaging unit, 34 denotes a search control unit, 35 denotes a memory control unit, and 36 denotes a profile memory.

The searcher section of this embodiment has a tracking ON
A case is shown in which the averaging unit 33, the memory control unit 35, and the search control unit 34 apply the / OFF signal to perform averaging count switching control and search interval switching control. The path following control is performed by shortening the search interval of the unit 34 and increasing the number of times of averaging by the averaging processing unit 33. When the tracking is OFF, the search interval of the search control unit 34 is increased and the averaging process is performed. The number of times of averaging of the unit 33 is reduced, and control is performed so as not to perform the path following control. As a result, the accuracy of the path follow-up control is increased, and the time required for the synchronization pull-up from the time when the follow-up is OFF is saved in the profile memory 3.
6 can be shortened without increasing the capacity.

5A and 5B are explanatory diagrams of the search interval and the number of times of averaging. FIG. 5A shows the search interval at the time of tracking, FIG. 5B shows the search interval at the time of non-tracking, and FIG. When the tracking is ON in the synchronous state, the search interval is set to, for example, t, and the sample data 1, 2, 3, 4, and 5 are stored in the addresses 1, 2, 3, 4, and 5 of the profile memory. The search window at that time is, for example, w. Then, according to the change of the maximum path timing in the five samples, the path following control is performed while the size of the search window w is kept as it is.

At the time of non-following (b), that is, when tracking is OFF in an asynchronous state, the search interval is set to, for example, 2t, and the sample data 1, 2, 3, 4, 5 are stored in the addresses 1, 2, 3, 3 of the profile memory. , 4, and 5. Assuming that the capacity of the profile memory is the same as that at the time of following, the search window is set to 2w, so that a wide range can be searched. In this case, the timing accuracy is halved. However, by widening the search range, synchronization pull-in becomes easy. If the search interval at the time of non-following is quadrupled with respect to the search interval t at the time of following, the search window is quadrupled, and the search range is further increased without increasing the capacity of the profile memory. Detection becomes easy.

(C) shows the number of times of averaging at the time of tracking, and (d) shows the number of times of averaging at the time of non-following. , The update timing for the profile memory is
Updates 1, 2, and 3 are shown corresponding to the path averages 1, 2, and 3, respectively. In contrast to this tracking, when switching is performed so that two frames are averaged for the wireless frame at the time of non-tracking in (d), the update timing for the profile memory becomes
Updates 1, 2, 3, 4, 5, and 6 shown corresponding to the path averages 1, 2, 3, 4, 5, 6, respectively. That is, the number of times of path averaging in the case of non-path following control is made smaller than the number of times of path averaging in the case of path following control, and in this case, the profile memory is updated twice as fast, so that the asynchronous state can be obtained. Can be speeded up. Therefore, if the number of averagings at the time of non-following is set to 1 / n of the number of times of averaging at the time of following, it is possible to perform synchronization pull-up at a speed of n times at the time of non-following as compared with the time of following.

FIG. 6 is an explanatory diagram of the second embodiment of the present invention, in which 40 is an IF unit, 41 and 42 are selectors, 43 is a searcher unit, 44 is a finger unit, 45 is an MRC unit, and 46
Is a synchronization detection unit, and 47 is a SIR (signal-to-interference-wave power ratio).
3 shows a measurement unit.

In this embodiment, similarly to FIG. 1, an IF signal based on a reception signal corresponding to six sectors is output from the IF unit 40, and a selector 41 outputs a maximum of four IFs corresponding to four sectors according to a selection setting signal. The selector 42 inputs a signal corresponding to a sector according to the sector selection signal from the searcher unit 43 to the finger unit 44. The finger unit 44 has eight fingers. A path timing signal corresponding to the finger is input to the finger unit 44 from the unit 43, and the demodulated data of each finger is subjected to rake combining by the maximum ratio combining in the MRC unit 45.

The synchronization detecting section 46 performs synchronization detection corresponding to each sector based on the pilot symbol of the demodulated data of the finger according to the finger number of the maximum path timing corresponding to the sector from the searcher section 43. The result is notified to the searcher unit 43. SIR measuring unit 47
Performs SIR measurement based on the level information of demodulated data after rake combining by the MRC unit 45, determines whether or not the threshold value exceeds a preset threshold value, and determines the tolerance and the number of protection steps in the synchronization detection unit 46. Switching can be performed to enable follow-up control even at the time of SIR deterioration. The searcher unit 43 may have a configuration corresponding to a sector shown in FIGS.

FIG. 7 is an explanatory view of the third embodiment of the present invention. Reference numeral 50 denotes an IF section, 51 and 52 are selectors, 53 is a searcher section, 54 is a finger section, 55 is an MRC section, 56
Denotes a synchronization detection unit, and 57 denotes a common synchronization detection unit. Except for the synchronization detection unit 56 and the common synchronization detection unit 57, they have substantially the same configuration as those in FIGS. 1 and 6, and redundant description will be omitted.

The common synchronization detector 57 performs synchronization detection based on the rake-combined demodulated data from the MRC unit 55,
The detection result is added to the synchronization detection unit 56. Further, the synchronization signal based on the synchronization detection is added to a subsequent processing circuit (not shown) for processing demodulated data from the MRC unit 55. The synchronization detecting section 56 performs synchronization detection corresponding to the sector based on the demodulated data from the finger of the maximum path timing corresponding to the sector, and performs synchronization detection in accordance with the synchronization detection result from the common synchronization detecting section 57. The synchronization detection parameters (tolerance, front protection stage number, rear protection stage number) of the section 56 are switched, and the synchronization detection result corresponding to the sector is added to the searcher section 53. The searcher unit 53 can have a configuration corresponding to a sector shown in FIGS.

FIG. 8 is an explanatory view of the fourth embodiment of the present invention, in which 60 is an IF section, 61 and 62 are selectors, 63 is a searcher section, 64 is a finger section, 65 is an MRC section, 66
Denotes a synchronization detection unit, and 67 denotes a common synchronization detection unit. Except for the searcher section 63 and the common synchronization detecting section 57, they have substantially the same configuration as those in FIGS. 1 and 6, and duplicate description will be omitted. The common synchronization detecting section 67 corresponds to the common synchronization detecting section 57 in FIG.
3 has been entered.

The common synchronization detecting section 67 performs synchronization detection based on the rake-combined demodulated data from the MRC section 65,
The detection result is input to the searcher unit 63, and the synchronization detection unit 66
Inputs the synchronization detection result corresponding to the sector to the searcher unit 63, similarly to the synchronization detection unit 6 in FIG. Searcher part 63
Switches the search interval, the number of times of averaging, and the like in accordance with the detection result of the synchronization and asynchronous of the sector by the synchronization detecting unit 66 and the synchronization and the asynchronous of the channel by the common synchronization detecting unit 67, and performs path following control. Is switched.

FIG. 9 is an explanatory diagram of parameters.
Indicates a path detection parameter, and shows a case where the IF signal is assumed to be a signal oversampled at eight times the spreading factor and the search interval is specified in chip units. One chip has a spreading period, and an oversampling of eight times is 1/8.
This means that sampling is performed at chip intervals.

When the path tracking control is performed with the synchronization detection result in a synchronous state, the search interval is set to 1/8 chip, the number of path averaging frames is set to 8, the path detection control is performed in an asynchronous state, and the path non-tracking control is performed. , The search interval is 1 /
Two chips and one path averaging frame number are assumed to be one frame.
As a result, as described with reference to FIGS. 5A and 5B, with the same capacity of the profile memory, the search interval in the path non-following control is four times that in the path following control, and 1/8. By setting the path update period to, the search range (search window) can be widened to enable high-speed path detection.

That is, the search control unit 14 shown in FIGS.
At 34, the search interval is switched in accordance with the tracking ON / OFF signal as described above, and the number of times of averaging is determined by the tracking ON / OFF signal in the averaging processing units 23 and 33 in FIGS. Since the switching is performed, the search range when the follow-up is OFF can be widened, and high-speed synchronization can be performed.

FIG. 9B shows the synchronization detection parameters, and shows the synchronization detection parameters of the synchronization detection unit 46 when the SIR measurement unit 47 of FIG. 6 is provided. The number of sectors is 6, the maximum number of sectors for path detection of the searcher unit 43 is 4, and the number of fingers of the finger unit 44 is 8. The number of radio frames is shown as the number of protection stages, and the number of allowable error bits is shown as the tolerance.

When the measured SIR is good, when it is not good (when it is not good), and in relation to channel synchronization, the SIR
When the condition is good, the forward protection for judging that the state has changed from the synchronous state to the asynchronous state is 6 frames, the backward protection for judging that the state has changed from the asynchronous state to the synchronous state is 2 frames,
Assuming that the tolerance (the number of allowable error bits) is 6 bits, S
When IR is not good, front protection is 8 frames and rear protection is 1
The frame and the tolerance are set to 8 bits, and for the channel synchronization, the parameters are changed so that the forward protection is 4 frames, the backward protection is 4 frames, and the tolerance is 10 bits. Thus, when the SIR is good, the parameter is set to a parameter that is more likely to be changed from the synchronous state to the asynchronous state and harder to be changed from the asynchronous state to the synchronized state, as compared with the case of the bad SIR. That is, when the SIR is good, the path detection state and the channel synchronization state show an approximate tendency, so that accurate path following control can be performed.

FIG. 9C shows the parameters of the number of times of path averaging, the search interval, and the window position. In FIG. 7 or FIG. 8, the sector synchronization by the synchronization detecting units 56 and 66 and the common synchronization are shown. Regarding the channel synchronization by the detectors 57 and 67, the case of sector synchronization and channel synchronization is a normal tracking state, the case of sector synchronization and channel asynchronous is a high-speed tracking operation, the case of sector asynchronous channel synchronization is a normal non-tracking operation, and the sector is asynchronous. And the case where the channel is asynchronous is set as the initial pull-in state.

That is, in the normal following operation, the number of times of path averaging is set to 8 frames, the search interval is set to 位置 chip, and the window position is set to follow. 1/8 chip, the window position is set to follow. That is, compared to the normal following operation,
In the case of the high-speed tracking operation with the channel asynchronous, the number of times of path averaging is set to 通常 of that in the normal tracking operation, the update interval of the profile memory is shortened, and the speed of the path tracking control is increased.

In the normal non-following operation, the search interval is set to 1/4 chip, the search window is widened in the high-speed following operation, and the window position is fixed when the window position becomes asynchronous. The initial pull-in state is a case where the synchronous pull-in is performed from the time of the normal non-follow-up operation. Therefore, the path can be detected at high speed by updating the profile memory at high speed with a wide search window.

(Supplementary Note 1) A predetermined number of received signals corresponding to a plurality of sectors among the received signals corresponding to a plurality of sectors, which include a searcher section and a finger section, are input to the searcher section to obtain a correlation value with a spreading code. In a CDMA receiving apparatus that performs despreading demodulation processing in the finger section by performing control to follow the path of the maximum path timing among the path timings according to the correlation value, the maximum path corresponding to the sector by the searcher section The demodulated data of the finger section corresponding to the timing is input and synchronously detected, and the path following control in the searcher section is performed in the synchronous state, and the path following control in the searcher section is stopped in the asynchronous state. A CDMA receiving apparatus comprising a synchronization detecting unit for causing the CDMA receiver to perform synchronization. (Supplementary Note 2) A common synchronization detection unit that receives demodulated data obtained by rake combining demodulated data of each finger of the finger unit and detects synchronization as a channel, and receives demodulated data of each finger of the finger unit. The synchronization detector has a configuration for switching a parameter for performing sector-based synchronization detection in accordance with the synchronization detection result of the common synchronization detector, and the searcher unit corresponds to the synchronization detection result of the synchronization detector. 2. The CDMA receiving apparatus according to claim 1, further comprising a configuration for switching one or both of the search interval and the number of times of path averaging. (Supplementary Note 3) An SIR measuring unit for inputting demodulated data obtained by rake-combining demodulated data of each finger of the finger unit and measuring a signal-to-interference-wave power ratio, wherein the synchronization detecting unit includes the SIR measuring unit The searcher unit switches one or both of a search interval and a path averaging count in accordance with the synchronization detection result of the synchronization detection unit. 2. The CDMA receiving apparatus according to claim 1, wherein the CDMA receiving apparatus has a configuration.

(Supplementary Note 4) The synchronization detecting unit is configured to perform the SIR
Corresponding to the measurement result of the measuring unit, the number of forward protection stages is increased when the signal wave-to-interference wave power ratio is not good compared to the case where the signal wave-to-interference wave power ratio is good, the number of rear protection stages is reduced, and an error-allowed bit as tolerance is increased. 4. The CDMA receiving apparatus according to claim 3, wherein the CDMA receiving apparatus has a configuration for switching the number of synchronization detection parameters to be increased. (Supplementary Note 5) The searcher unit includes an MF correlation value detection unit, a code generation unit, an averaging processing unit, a search control unit, a memory control unit, and a profile memory, and the search control unit includes:
Based on the synchronization detection result corresponding to the sector by the synchronization detection unit, the path tracking control is switched to the path non-tracking control in the synchronous state, the path tracking control is switched to the path non-tracking control in the asynchronous state, and the search interval at the time of non-path tracking is shorter than the search interval at the time of the path tracking control. 5. The CDM according to claims 1 to 4, characterized in that the CDM has a configuration for switching to
A receiving device. (Supplementary Note 6) The searcher unit includes an MF correlation value detection unit, a code generation unit, an averaging processing unit, a search control unit, a memory control unit, and a profile memory, and the search control unit includes:
According to the result of synchronization detection of the sector corresponding to the synchronization detection unit, in the synchronous state, the path following control, in the asynchronous state has a configuration to switch to the path non-tracking control, the averaging processing unit,
6. The CDMA receiving apparatus according to claim 1, wherein the switching is performed such that the number of times of path averaging in the non-path following control is smaller than the number of times of averaging in the path following control.

(Supplementary Note 7) A reception value corresponding to a predetermined number of sectors among the reception signals corresponding to a plurality of sectors is input, a correlation value with a spreading code is obtained, and a maximum path in a path timing according to the correlation value is obtained. In a path detection control method for performing tracking control on a timing path, demodulated data of a finger section corresponding to a maximum path timing corresponding to a sector by a searcher section is input and synchronously detected for a sector. Controlling the path following control in step (a), and suspending the path following control in the searcher unit in an asynchronous state. (Supplementary Note 8) According to the synchronization detection result corresponding to the sector, the path following control is performed by shortening the search interval in the searcher unit in the synchronous state, and the search interval in the searcher unit is changed in the asynchronous state. 8. The path detection control method according to claim 7, further comprising a step of stopping the path following control by making the path detection control longer. (Supplementary note 9) According to the synchronization detection result corresponding to the sector, in the synchronous state, the averaging count in the searcher unit is increased to perform the path following control, and in the asynchronous state, the averaging in the searcher unit is performed. 7. The path detection control method according to claim 7, further comprising the step of reducing the number of times to stop the path following control. (Supplementary Note 10) A common synchronization detection unit that performs synchronization detection based on demodulated data obtained by maximally combining demodulated data of the finger units,
In response to a synchronization detection result with a synchronization detection unit that performs sector-based synchronization detection by inputting demodulated data of each finger of the finger unit, a path averaging count and a search interval in the searcher unit are switched, and 8. The path detection control method according to claim 7, further comprising a step of performing path following control at the time of synchronization determination by the synchronization detector and stopping the path following control at the time of asynchronous determination. (Supplementary Note 11) A power ratio of a signal wave to an interference wave is measured based on the demodulated data obtained by combining the demodulated data of the finger portions at a maximum ratio.
When the signal-to-interference-wave power ratio is good, a synchronization detection parameter in which the number of forward protection stages in the synchronization detection unit is large, the number of backward protection stages is small, and the number of error-permissible bits is large in the case of not good. 7. The path detection control method according to claim 7, further comprising a step of switching to the path detection control.

[0046]

As described above, the present invention relates to a CDMA receiver and a path detection control method including a searcher unit 3 and a finger unit 4 for processing a received signal corresponding to a plurality of sectors. I for the selected sector
Based on the F signal, the searcher unit 3 performs a path search, adds a path timing to the finger of the finger unit 4 and selects a sector to control the selector 2. The IF signal corresponding to the sector selected by the selector 2 Is input to the finger unit 4 to perform a despread demodulation process and a synchronous detection process to output demodulated data. The synchronization detection unit 6 performs synchronization detection corresponding to the sector using the demodulated data corresponding to the finger. The path tracking control in the searcher unit 3 is turned on and off according to the synchronization detection result, and the path detection and tracking control of each sector is performed according to the synchronization detection result in sector units. Therefore, accurate path following control can be performed even when receiving a plurality of sectors.

The searcher unit 3 controls one or both of the search interval and the number of times of path averaging in accordance with the synchronization detection result corresponding to the sector by the synchronization detection unit 6. By shortening the interval or increasing the number of times of path averaging, the path follow-up control is performed accurately, and in the asynchronous state, the search interval is lengthened to widen the search window or increase the number of times of path averaging. It is possible to shorten the update cycle of the profile memory by reducing the number, and to speed up the path detection in the path non-following control.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a first embodiment of the present invention.

FIG. 2 is an explanatory view of a main part of an embodiment of a searcher section of the present invention.

FIG. 3 is an explanatory view of a main part of another embodiment of the searcher section of the present invention.

FIG. 4 is an explanatory view of a main part of still another embodiment of the searcher section of the present invention.

FIG. 5 is an explanatory diagram of a search interval and the number of times of averaging.

FIG. 6 is an explanatory diagram of a second embodiment of the present invention.

FIG. 7 is an explanatory diagram of a third embodiment of the present invention.

FIG. 8 is an explanatory diagram of a fourth embodiment of the present invention.

FIG. 9 is an explanatory diagram of parameters.

FIG. 10 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1, 2 selector 3 searcher unit 4 finger unit 5 MRC unit 6 synchronization detection unit 10 IF unit

Claims (5)

[Claims] 1. A search signal including a searcher section and a finger section, a reception signal corresponding to a predetermined number of sectors among reception signals corresponding to a plurality of sectors is input to the searcher section, and a correlation value with a spreading code is obtained. In a CDMA receiving apparatus which performs a despread demodulation process in the finger unit by controlling the path of the maximum path timing among the path timings according to the value, the maximum path timing corresponding to the sector by the searcher unit The synchronous detection is performed by inputting the demodulated data of the finger unit corresponding to the above. The path following control in the searcher unit is performed in the synchronous state, and the path following control in the searcher unit is stopped in the asynchronous state. A CDMA receiver comprising a synchronization detection unit. 2. A common synchronization detecting unit for receiving demodulated data obtained by rake combining demodulated data of each finger of the finger unit and detecting synchronization as a channel, and receiving demodulated data of each finger of the finger unit. The synchronization detection unit has a configuration for switching synchronization detection parameters based on a synchronization detection result of the common synchronization detection unit and synchronization detection corresponding to a sector, and the searcher unit performs synchronization detection of the synchronization detection unit. 2. The CDMA receiving apparatus according to claim 1, further comprising a configuration for switching one or both of a search interval and a path averaging count according to a result. 3. An SIR measuring section for inputting demodulated data obtained by rake-combining demodulated data of each finger of the finger section and measuring a power ratio of a signal wave to an interference wave, and wherein the synchronization detecting section comprises: Having a configuration for switching the synchronization detection parameter in accordance with the measurement result of the unit, the searcher unit, either or both of the search interval and the number of path averaging corresponding to the synchronization detection result of the synchronization detection unit 2. The CDMA according to claim 1, wherein said CDMA has a switching configuration.
Receiver. 4. A reception signal corresponding to a predetermined number of sectors among reception signals corresponding to a plurality of sectors is inputted, a correlation value with a spreading code is obtained, and a maximum path timing among path timings according to the correlation value is calculated. In a path detection control method for controlling to follow a path, demodulated data of a finger section corresponding to a maximum path timing corresponding to a sector by a searcher section is input and synchronously detected for a sector. And performing a path following control in the searcher unit in an asynchronous state. 5. A synchronous detection or a signal-to-interference-wave power ratio measurement is performed based on the demodulated data obtained by combining the demodulated data of the finger parts at a maximum ratio, and the synchronization detection result or the signal-to-interference power ratio measurement result is obtained. Correspondingly, the method further comprises a step of inputting demodulated data of a finger corresponding to a maximum path timing corresponding to a sector by the searcher unit and switching a synchronization detection parameter of a synchronization detecting unit for performing synchronous detection corresponding to the sector. Item 6. The path detection control method according to Item 4.