JP2002217781A - Cdma receiver and its path assignment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a CDMA receiver that changes required reception quality depending on a data type of a received signal, properly controls number of fingers assigned to the received signal of each data type, and can reduce the power consumption without the need for activating unnecessary fingers. SOLUTION: The CDMA receiver is provided with a detection section that detects a path for a received reception signal, an assignment section that assigns the received signal by each path detected by the detection section to each finger, a synthesis section that synthesizes demodulation results of the received signals by each path outputted from each finger, a channel decoding section that decodes the synthesis result of the received signals by the synthesis section, a data type discrimination section that discriminates a data type of the received signal on the basis of the decoding result of the received signal decoded and obtained by the channel decoding section, and a signal quality discrimination section that obtains the reception quality of the received signal on the basis of the synthesis result and the decoding result of the received signal, compares the received quality with a criterion of the received quality on the basis of the data type and instructs assignment of a finger by the assignment section on the basis of the obtained comparison result.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a CDMA receiving apparatus and a method of allocating paths to fingers of the CDMA receiving apparatus.

[0002]

2. Description of the Related Art An example of a rake receiver included in a CDMA receiver is disclosed in JP-A-11-261523, which is shown in FIG. FIG. 7 is a block diagram showing a conventional rake receiving device. As shown in FIG. 7, the conventional rake receiving apparatus includes a synchronization unit 1 and a demodulation unit 2.
, A detection unit 5, a synthesis unit 6, a channel demodulation unit 7, a demodulation control unit 8, registers 31 to 32, a comparator 33, and a symbol error rate output unit 34. With this configuration, in this conventional example, a unique function is realized in which the number of demodulators 2 to 4 used for demodulating a received signal can be appropriately changed according to line conditions.

[0003] The configuration of a functional block for realizing such a specific function will be described below. The symbol error rate output unit 34 is a means for determining which of a plurality of types of predetermined speeds the information source signal corresponding to the currently received signal is. In the example, the output is used to determine the line state.

The registers 31 to 32 are means for storing a threshold value of the symbol error rate. This register 3
The number of 1 to 32 is the number of demodulators 2 to 4 (3 in FIG. 7).
1) The number is set to one less than N, that is, N−1. The threshold values stored in each of the registers 31 to 32 are predetermined values according to the line state, and are stored in order.

The comparator 33 sequentially compares the symbol error rate input from the symbol error rate output section 34 with a plurality of threshold values stored in the registers 31 to 32, and demodulates the comparison result. This is a means given to the unit 8. In the case of the comparator 33 as well, it is only necessary to know the magnitude relationship between the symbol error rate and the threshold value, so that the comparison result for each threshold value is given by one bit. It is also assumed that the handling when the two values to be compared are equal is predetermined.

The demodulation control unit 8 is a demodulation control unit having a function of individually turning on and off the demodulation units 2 to 4 based on the comparison result of the comparator 33. On the other hand, the setting is made so that, among the three assignable phase values, the one with the largest integral value is assigned in order.

That is, in the case of the demodulation control unit 8, when the number of the demodulation units 2 to 4 to be ON-controlled is one (which demodulation units 2 to 4 are ON-controlled freely), the detection unit 5 Of the three phase values given, the one with the maximum corresponding integrated value is given to the demodulators 2 to 4 for ON control, and when the number of demodulators 2 to 4 for ON control is two, the detector 5
Are set so as to individually give the upper two of the three phase values given by the demodulators 2 to 4 that have the larger corresponding integral values to the demodulators 2 to 4 that perform the ON control.

The control operation of the demodulation control unit 8 when the line condition is bad is such that the three phase values given from the detection unit 5 are applied to all three demodulation units 2 to 4 that are turned on one by one. They are given individually.

Next, the communication operation of the rake receiving apparatus having the above configuration will be described. First, the case where the communication state is the best is described. At this time, the symbol error rate value output from the symbol error rate output section 34 becomes a large value, and becomes larger than any threshold value (stored in the registers 31 to 32) compared by the comparator 33. As a result, the demodulation control unit 8
It is determined that demodulation can be sufficiently performed only by turning on one of the demodulation units 2 to 4. For example, only the demodulation unit 2 is turned on, and the other two demodulation units 3 to 4 are turned off. The following processing is performed.

Thus, to the demodulation unit 2 which is controlled to be ON, the phase value which gives the largest integral value among the three phase values provided from the detection unit 5 is assigned, and the demodulation unit 2 is controlled in a good state. The demodulated received signal is provided to the channel decoding unit 7 via the combining unit 6. Such actions are:
The degradation of the line state is continued until it appears as a reduction in the difference value of the path metric.

Next, a case where the communication condition is slightly deteriorated will be described. At this time, the symbol error rate output unit 3
The symbol error rate value output from 4 has a sufficiently large value but a value smaller than the best state. Then, this value falls below the threshold value corresponding to the better condition of the line condition among the two threshold values compared in the comparator 33 (that is, in this case, the difference value is one of the two threshold values). (Below the threshold but remain above the other thresholds). As a result, the demodulation control unit 8
Is sufficient if two of the demodulators 2 to 4 are controlled to be on.
It is determined that demodulation is possible, and for example, processing is performed so that the demodulation units 2 and 3 are turned on and the remaining one demodulation unit 4 is turned off.

Thus, for the demodulators 2 and 3 that are turned on, the phase value that gives the largest integral value and the second largest integral value among the three phase values given from the detector 5 are obtained. Thus, the received signals demodulated by the two demodulators 2 and 3 are combined by the combiner 6 and then provided to the channel decoder 7. This operation is continued until further deterioration of the line condition appears as a reduction in the difference value of the path metric.

Next, a case where the communication condition is deteriorated will be described. At this time, the symbol error rate value output from the symbol error rate output section 34 becomes a smaller value. Then, this value falls below both of the two threshold values compared in the comparator 33. As a result, the demodulation control unit 8 determines that it is necessary to turn on all of the demodulation units 2 to 4, and performs processing to turn on each of the demodulation units 2 to 4.

Thus, the received signals demodulated by the three demodulators 2 to 4 are combined by the combiner 6 and then supplied to the channel decoder 7, where a predetermined Viterbi decoding process is performed. This operation is continued until the line condition is restored and the symbol error rate value increases.

[0015]

SUMMARY OF THE INVENTION As described above, the conventional C
In the DMA receiving apparatus, the received signal of each data type is assigned to the finger as the demodulation unit based on a single reception quality regardless of the data type of the received signal. Was difficult to suppress. The present invention has been made to solve such a problem, and changes the reception quality required according to the data type of a received signal, and optimally controls the number of fingers assigned to the received signal of each data type. Another object of the present invention is to reduce power consumption without operating unnecessary fingers.

[0016]

Means for Solving the Problems CDMA according to the present invention
The receiving apparatus includes: a detecting unit that detects a path of an input received signal; an allocating unit that allocates a received signal for each path detected by the detecting unit to each finger; and a receiving unit that receives a received signal for each path output from each finger. A combining unit for combining the demodulation result, a channel decoding unit for decoding the combined result of the received signal combined by the combining unit, and data of the received signal based on the decoded result of the received signal decoded by the channel decoding unit A data type determination unit for determining the type, obtaining the reception quality of the received signal based on the combined result and the decoding result of the received signal, and comparing the received quality with a reception quality determination criterion based on the data type; And a signal quality determining unit for instructing assignment of the finger to the assignment unit based on the comparison result obtained.

In the CDMA receiving apparatus according to the present invention, the number of fingers assigned to the received signal is increased based on the signal quality of the received signal. If the signal quality of the signal changes only within a predetermined range, the number of fingers assigned to the received signal is restored.

Further, the CDMA receiving apparatus according to the present invention reduces the number of fingers assigned to the received signal based on the signal quality of the received signal. If the signal quality of the received signal is lower than the predetermined quality, the number of fingers assigned to the received signal is restored.

A path assignment method for a CDMA receiving apparatus according to the present invention includes a path detection step of detecting a path of an input received signal, an assignment step of assigning a received signal for each detected path to each finger, and a step of assigning each finger. A combining step of combining the demodulation results of the received signals for each path output from the channel, a channel decoding step of decoding the combined results of the combined received signals, and receiving based on the decoded results of the decoded received signals. A data type determining step in which the data type of the signal is determined; obtaining a reception quality of the received signal based on a synthesis result and a decoding result of the received signal; comparing the reception quality with a determination criterion based on the data type; Signal quality determining step of designating the number of fingers to be assigned to the signal.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a CDMA receiver according to the present invention will be described with reference to FIG. FIG. 1 is a block diagram illustrating a configuration of the CDMA receiving apparatus according to the present embodiment. In FIG. 1, a detection unit 41 detects a path from the received baseband signal. Reference numeral 42 denotes an allocating unit that determines to which finger the detected path is to be allocated. Reference numerals 43-1 to 43-n denote n fingers for demodulating the assigned paths. Reference numeral 44 denotes a combining unit that combines the signals demodulated by the n fingers. Reference numeral 45 denotes a channel decoding unit that decodes the combined signal. Reference numeral 46 denotes a signal quality determination unit that determines a signal quality and a change in the quality from the output from the combining unit 44 and the output from the channel decoding unit 45. A data type determination unit 47 determines the type of data of the decoded signal from the signal.

Next, the operation of the CDMA receiver according to the present embodiment will be described. In FIG. 1, a signal input to the detection unit 41 is a digital baseband signal obtained by down-converting and A / D converting a signal received by an antenna. This baseband signal includes a pilot signal which is a known bit pattern at a specified timing. The detection unit 41 compares the input baseband signal with a known pilot signal and takes a correlation therebetween. If the correlation value level indicating the degree of correlation between the baseband signal and the known pilot signal at a certain timing is equal to or greater than a certain threshold, it is determined that there is a path at that timing, and the correlation value level is determined. The timing is notified to the assignment unit 42.

The allocating section 42 determines which of the paths detected by the detecting section 41 is to be allocated to which finger 43-1 to n. For example, it may be determined that the number of fingers 43-1 to 43-n is assigned in order from the path having the highest correlation value level. Then, the allocating unit 42 sets the fingers 43-1 to n so that the fingers 43-1 to n to which the paths are allocated operate normally. That is, the allocating unit 42
Is set so that the fingers 43-1 to n operate normally at the timing when the assigned path is detected.
3-1 to n are set.

Fingers 43-1 to n in allocating section 42
The assignment of the path to the server is managed using a path assignment table as shown in FIG. In the path assignment table, for each path obtained by the detection unit 41, the path timing, the path level, the assignment information, the assignment finger 43-1.
To n are set. Note that the assignment information is information represented by 1 or 0, and the finger 43-1 for each path.
In the assignment processing of .about.n, a path whose assignment has been changed is represented by 1 and a path which has not been changed is represented by 0. In addition, at the time of the first assignment, all 0s are set. The number of the finger 43-1 to n to which the path is assigned is stored in the assignment finger column. However, 0 is stored in the path to which the fingers 43-1 to 43-n are not assigned.

Each of the fingers 43-1 to 43-n performs demodulation processing such as despreading, amplitude adjustment, and phase compensation on the input baseband signal according to the timing set by the allocating section 42, and obtains the demodulation obtained. Output a signal. Synthesizer 4
In step 4, the demodulated signals output from the fingers 43-1 to 43-n are combined. The demodulated signal output from the combining unit 44 is
Since the signal is encoded on the transmission side, the channel decoding unit 45 decodes the demodulated signal. The data type determination unit 47 determines the type of data based on data indicating the type of data included in the data decoded by the channel decoding unit 45.

Next, the signal quality judgment procedure in the signal quality judgment section 46 will be described with reference to FIG. FIG. 2 is a flowchart illustrating a signal quality determination procedure of the signal quality determination unit 46. In S1, the signal quality determination unit 46 re-encodes the output signal output from the channel decoding unit 45 to generate re-encoded data. When S1 ends, the process proceeds to S2. In S2, the signal quality determination unit 46 compares the output from the combining unit 44 with the re-encoded data, and calculates the symbol error rate of the output from the combining unit 44. When S2 ends, the process proceeds to S3.

In S 3, the signal quality judgment unit 46 sets a signal quality judgment threshold value indicating a required symbol error rate based on the data type output from the data type judgment unit 47,
Extracted from the signal quality determination threshold table. This S3
Is completed, the process proceeds to S4. In S4, the signal quality determination unit 46
Compares the symbol error rate with a signal quality determination threshold. If the symbol error rate is smaller than the signal quality determination threshold, the process proceeds to S5. Otherwise, proceed to S6.

In S5, since the symbol error rate is smaller than the signal quality determination threshold, the signal quality determination unit 46 notifies the allocation unit 42 of a signal quality determination result indicating "sufficient signal quality". When this S5 is completed, S7
Proceed to. In S6, the signal quality determination unit 46 determines that the symbol error rate is equal to or higher than the signal quality determination threshold,
The assignment unit 42 is notified of the signal quality determination result of “signal quality is insufficient”. When S6 ends, the process proceeds to S7.

In step S7, the signal quality determination unit 46 calculates a difference between the current symbol error rate and the previous symbol error rate ((current symbol error rate)-(previous symbol error rate)). When this S7 ends, S
Proceed to 8. In S8, the signal quality determination unit 46 determines whether the difference value obtained in S7 is larger than the signal quality difference upper limit value. If the difference value obtained in S7 is larger than the signal quality difference upper limit value, the process proceeds to S10. Otherwise, proceed to S9.

In S9, the signal quality determination section 46 determines whether the difference value obtained in S7 is smaller than the signal quality difference lower limit value. If the difference value obtained in S7 is smaller than the signal quality difference lower limit value, the process proceeds to S12. Otherwise, proceed to S11. In S10, the signal quality determination unit 46 notifies a signal quality change result of “improvement of signal quality”. When S10 ends, the process proceeds to S13.

In step S11, the signal quality judging section 46 notifies a signal quality change result of "no signal quality change". This S1
When 1 is completed, the process proceeds to S13. In S12, the signal quality determination unit 46 notifies a signal quality change result of “signal quality deterioration”. When S12 ends, the process proceeds to S13. In S13, the signal quality determination unit 46 stores the current symbol error rate.

Next, FIG. 3 shows an example of a signal quality judgment threshold value table included in the data type judgment section 47. FIG. 3 is a signal quality determination threshold value table included in the data type determination unit 47. In this signal quality determination threshold value table, the signal quality determination threshold values Th_A, Th_B, and Th for the three data types A, B, and C, respectively.
_C is stored. The data types A to C include, for example, image data, audio data, text data, and the like.

The signal quality judgment threshold value table is
The threshold can be subdivided depending on the symbol rate of the received signal and the encoding method. An example of the signal quality determination threshold value table in that case will be described with reference to FIG. FIG. 4 is a more detailed signal quality determination threshold value table included in the data type determination unit 47.

In FIG. 4, the signal quality judgment threshold value table has two types of coding methods, convolutional coding and turbo coding, and SR1 to SRn as symbol rates.
N, and three types of data, A, B, and C, are shown. When the encoding method, the symbol rate, and the data type are specified, the corresponding signal quality determination threshold value Th_xxx is extracted.

Next, a procedure for changing the path assignment when the signal quality judgment result and the signal quality change result regarding the baseband signal from the signal quality judgment unit 46 in the allocation unit 42 are obtained will be described with reference to FIG. explain. FIG. 5 is a flowchart showing a procedure for changing the path assignment in the assignment unit 42. In S21, the allocating unit 42 determines whether the signal quality
It is determined whether the signal quality determination result of No. 6 is sufficient for the signal quality. If the signal quality determination result indicates that the signal quality is sufficient, the process proceeds to S22. Otherwise, proceed to S23.

In S22, the allocating unit 42 determines whether the signal quality
Since the signal quality determination result from No. 6 indicates that the signal quality is sufficient, the path determination threshold for determining the path level of the path is increased by the increase width Δth1. By doing so, the finger that operates for demodulation of a path having a relatively low path level is stopped, and power consumption is reduced. However, if the signal quality deteriorates after reducing the number of operating fingers, it may be restored. When S22 ends, the process proceeds to S26.

In S23, the allocating section 42 determines whether the signal quality
Since the signal quality determination result from No. 6 is insufficient, the path determination threshold is reduced by the decrease width Δth2. When S23 ends, the process proceeds to S24. In S24, the allocating unit 42 determines whether or not the signal quality has improved in the change of the signal quality in the signal quality determining unit 46. When the signal quality is improved, the process proceeds to S26. Otherwise S
Proceed to 25.

In S25, since it is not determined that the signal quality has been improved, the allocating unit 42 changes the setting of the path allocation table so as to cancel the allocation of the finger newly allocated in the previous finger allocation processing. When S25 ends, the process proceeds to S26. In S26, the allocating unit 42 determines in S2
2 or the path determination threshold value changed in S23 is compared with the path level of each path, and the path having a higher path level than the path determination threshold value is assigned to the fingers 43-1 to 43-n. Accordingly, the allocating unit 42 also changes the setting of the path allocation table. The path removed from the assignment to the finger in S25 is not assigned again. When S26 ends, the process proceeds to S27. S27
The assignment unit 42 actually sets the assignment of paths to the fingers 43-1 to 43-n based on the changed path assignment table.

Next, an example of setting the path assignment table in S25 will be described with reference to FIG. FIG. 6 is a setting example of the path assignment table. Table C in FIG. 6 shows assignment of fingers 43-1 to 43-n to each path before updating. At this time, since 1 is recorded in the assignment information column of the path 5 in Table C and the finger 5 is recorded in the assignment finger column, the path 5 is assigned to this finger 5 in the previous finger assignment process. You can see that it has been assigned.

Next, Table D in FIG. 6 shows the assignment of the fingers 43-1 to 43-n to each updated path. At this time, the step S25 changes the path assignment table so as to cancel the assignment of the finger 5 previously assigned. As a result, in the row of the path 5 in Table D, “2” indicating assignment prohibition is set in the assignment information column, and “0” is set in the assignment finger column.
Is set. In S25, the finger 43-
Fingers 43-1 to 43-n are not allocated in S26 to the path for which the allocation of 1 to n has been canceled, that is, the path in which “2” is set in the allocation information column.

The path assignment table is updated or initialized based on the path information periodically output from the detection unit 41.

Next, an example of setting a path assignment table when the signal quality is sufficient in S26 will be described with reference to FIG. Table A in FIG. 6 shows the assignment of fingers 43-1 to n to each path before updating. In Table A of FIG. 6, paths 1-4 have path levels higher than the path determination threshold, and
It can be seen that fingers 43-1 to 4-3 have been assigned.

On the other hand, Table B in FIG. 6 shows the assignment of the fingers 43-1 to 43-n to each updated path. At this time, S26 compares the changed path determination threshold value with the path level of each path, and allocates a path having a path level higher than the path determination threshold value to fingers 43-1 to n. This is a change process, and as a result of this process, Table B
Path 4 has become smaller than the path determination threshold value after the path level has been updated, the assignment of the finger 43-4 is canceled, and the column of the assigned finger of the path 4 is set to 0.
It has become.

At this time, 1 is set in the assignment information column of the path 4 because the assignment has been changed. On the other hand, in the assignment information column of other paths, there is no change in the assignment,
0 is set. Even if the path determination threshold value is updated, if there is no change in the magnitude relationship between the threshold value and the path level of each path, the allocation finger for each path is not changed, and the allocation information column is set to 0. Becomes

Next, an example of setting a path assignment table when the signal quality is insufficient in S26 will be described with reference to FIG. Table A in FIG. 6 shows the assignment of fingers 43-1 to n to each path before updating, and the contents are the same as those described above.

On the other hand, Table C in FIG. 6 shows the assignment of the fingers 43-1 to 43-n to each updated path. At this time, S26 compares the changed path determination threshold value with the path level of each path, and determines the path of the path to which the fingers 43-1 to n are assigned to the path whose path level is higher than the path determination threshold value. This is an assignment change process. As a result of this process, path 5 in Table C has become larger than the path determination threshold value after the path level has been updated.
Are added, and the finger column of the assignment finger of the path 5 is the finger 5.

At this time, 1 is set in the assignment information column of the path 5 because the assignment has been changed. On the other hand, the assignment information fields for the other paths are 0
Is set. Even if the path determination threshold value is updated, if there is no change in the magnitude relationship between the threshold value and the path level of each path, the allocation finger for each path is not changed, and the allocation information column is set to 0. Becomes

As described above, the required signal quality can be changed depending on the type of data included in the received baseband signal. Enough fingers 4
Only 3-1 to n can be operated, unnecessary operation of the fingers 43-1 to n can be reduced as much as possible, and power consumption can be reduced.

If the signal quality is not improved after increasing the path allocation to the fingers 43-1 to 43-n, even if the level of the increased path exceeds the path determination threshold value. , Deassign the finger for this path. Therefore, unnecessary operation of the fingers 43-1 to 43-n can be reduced as much as possible, and power consumption can be reduced.

[0049]

As described above, the CDMA according to the present invention
The receiving apparatus includes: a detecting unit that detects a path of an input received signal; an allocating unit that allocates a received signal for each path detected by the detecting unit to each finger; and a receiving unit that receives a received signal for each path output from each finger. A combining unit for combining the demodulation result, a channel decoding unit for decoding the combined result of the received signal combined by the combining unit, and data of the received signal based on the decoded result of the received signal decoded by the channel decoding unit A data type determination unit for determining the type, obtaining the reception quality of the received signal based on the combined result and the decoding result of the received signal, and comparing the received quality with a reception quality determination criterion based on the data type; And a signal quality determining unit for instructing assignment of a finger to an assigning unit based on the comparison result obtained. Since optimally control the number of fingers to be allocated to the received signal, without operating the unnecessary finger, it is possible to reduce power consumption.

A path assignment method for a CDMA receiving apparatus according to the present invention includes a path detecting step of detecting a path of an input received signal, an assigning step of assigning a received signal for each detected path to each finger, and a step of assigning each finger. A combining step of combining the demodulation results of the received signals for each path output from the multiplexing unit, a channel decoding step of decoding the combined results of the combined received signals, and receiving based on the decoded results of the decoded received signals. A data type determining step in which a data type of the signal is determined; obtaining a reception quality of the received signal based on a combined result and a decoding result of the received signal; comparing the received quality with a determination criterion based on the data type; Signal quality determining step for indicating the number of fingers to be assigned to the signal, which is required depending on the data type of the received signal. Changing the signal quality, since optimally controlling the number of fingers to be allocated to the received signal of each data type, without operating the unnecessary finger, it is possible to reduce power consumption.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a CDMA receiving apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a signal quality determination unit 4 according to the embodiment of the present invention.
6 is a flowchart illustrating a signal quality determination procedure of No. 6;

FIG. 3 is a signal quality determination threshold value table included in a data type determination unit 47 included in the embodiment of the present invention.

FIG. 4 is a more detailed signal quality determination threshold value table included in a data type determination unit 47 included in the embodiment of the present invention.

FIG. 5 is a flowchart illustrating a procedure for changing a path assignment in an assigning unit 42 according to the embodiment of the present invention.

FIG. 6 is a setting example of a path assignment table according to the embodiment of the present invention.

FIG. 7 is a block diagram showing a conventional rake receiving device.

[Explanation of symbols]

1 synchronization section, 2-4 demodulation section, 5 detection section, 6 synthesis section, 7 channel demodulation section, 8 demodulation control section, 31-32
Register, 33 comparator, 34 symbol error rate output unit, 41 detection unit, 42 allocation unit, 43-1 to 4-4
3-n finger, 44 combining unit, 45 channel decoding unit, 46 signal quality determining unit, 47 data type determining unit.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yoichi Amada 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term in Mitsubishi Electric Corporation (reference) 5K022 EE01 EE31 5K059 CC00 DD33 DD35 5K067 AA02 AA05 AA43 BB04 CC10 EE02

Claims (4)

[Claims] A detecting unit for detecting a path of an input received signal; an allocating unit for allocating a received signal for each path detected by the detecting unit to each finger; and for each path output from each finger. A combining unit that combines the demodulation results of the received signals, a channel decoding unit that decodes the combined result of the received signals combined by the combining unit, and a receiving unit that decodes the received signal obtained by the channel decoding unit. A data type determining unit for determining a data type of the received signal based on a decoding result, obtaining a reception quality of the reception signal based on a synthesis result and a decoding result of the reception signal, and obtaining the reception quality and the data type. And a signal quality determining unit for instructing assignment of a finger to the assigning unit based on the obtained comparison result.
MA receiver. 2. The method according to claim 1, wherein the number of fingers assigned to the received signal is increased based on the signal quality of the received signal.
2. The CDMA receiver according to claim 1, wherein if the signal quality of the received signal changes only within a predetermined range, the number of fingers assigned to the received signal is restored. 3. The method according to claim 1, wherein the number of fingers assigned to the received signal is reduced based on the signal quality of the received signal.
2. The CDMA receiving apparatus according to claim 1, wherein when the signal quality of the received signal deteriorates below a predetermined quality, the number of fingers assigned to the received signal is returned to the original. 4. A path detecting step of detecting a path of an input received signal, an allocating step of allocating a received signal of each detected path to each finger, and a received signal of each path output from each finger A combining step of combining the demodulation results of the above, a channel decoding step of decoding the combined result of the combined received signal, and determining a data type of the received signal based on a decoded result of the decoded received signal. Data type determination step to be performed, the reception quality of the reception signal is obtained based on the synthesis result and the decoding result of the reception signal, and the reception quality is compared with a determination criterion based on the data type. A signal quality determining step of designating the number of fingers to be allocated; a path allocation method for a CDMA receiving apparatus.