JP2003258745A - Sir measuring instrument, sir measuring method, sir measuring program, and computer readable recording medium with sir measuring program recorded thereon - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve an SIR decision error rate. <P>SOLUTION: The SIR measuring instrument is provided with a receiving part 10 for receiving a signal (a), a hardness deciding part 12 for deciding the hardness of each signal point (b), a signal point average value calculating part 14 for calculating the average value of the respective signal points (c), a signal point selecting part 16 for desired signal power calculation for selecting a signal point to be used for desired signal power calculation (d), a desired signal power calculating part 18 for calculating a desired signal power (e), a desired signal power average value calculating part 20 for calculating the average value of the desired signal power (f), a signal point selecting part 22 for interference signal power calculation for selecting a signal point to be used for calculating interference signal power (g), an interference signal power calculating part 24 for calculating the interference signal power (h), an interference signal power average value calculating part 26 for calculating the average value of the interference signal power (i), and an SIR calculating part 28 for finding an SIR by calculating the ratio of the desired signal power average value and the interference signal power average value (j). <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an SIR measuring device,
The present invention relates to an SIR measuring method, a SIR measuring program, and a computer-readable recording medium recording the SIR measuring program, and more particularly to an SIR measuring technique used for wireless communication using multilevel modulation.

[0002]

2. Description of the Related Art Conventionally, 16Q has been used as one of methods for realizing communication between a mobile communication terminal such as a mobile phone and a base station.
A multilevel modulation method such as AM (Quadrature Amplitude Modulation) is used. In 16QAM, various signals are transmitted and received by arranging 4-bit information at lattice-type signal points.

On the other hand, in mobile communication, it is necessary to measure SIR (desired signal to interference signal power ratio). IMT-2
000 CDMA TDD (Internationala
lMobile Telecommunication
s 2000 Code Division Multiple Access Time Division Duplex) with HSDPA (High Speed Do)
In Wnlink Packet Access), transmission power control and MCS are performed by measuring SIR.
(Modulation and Coding Sc
It is possible to change the “heme” and control the packet scheduling.

A conventional SIR measuring method will be described with reference to FIG. As shown in FIG. 9, in step S301, the received signal is divided into an in-phase component and a quadrature component. Step S303
Calculate the absolute value for each in-phase component and quadrature component. In step S305, a hard decision is made on the signal point from the absolute value. An average value is calculated for each signal point for which a hard decision is made in step S307. In step S309, the desired signal power is calculated for each of all the signal points. In step S311, all desired signal powers are calculated using all signal points. In step S313, the interference signal power is calculated for each of all the signal points.
In step S315, the total interference signal power is calculated using all the signal points. In step S317, the SIR is calculated using the total desired signal power and the total interference signal power. The conventional SIR measurement method is a technique applicable to the CDMA system.

[0005]

However, the above-mentioned prior art has the following problems. That is, since the signal point is determined by the hard decision, when the interference signal power is large, a hard decision may be erroneously made with other signal points, and it may be calculated to be smaller than the actual interference signal power. This increases the SIR decision error rate. Such a problem occurs especially in the innermost signal point in 16QAM.

There is also a method of determining signal points by soft decision. However, it is necessary to calculate the signal point from the information determined by the soft decision, and there is a problem that the calculation amount increases.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an SIR measurement technique for reducing the SIR decision error rate without increasing the calculation amount.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first feature thereof is a receiving means for receiving a signal and a signal point received by the receiving means. Hard decision means for making a hard decision, signal point average value calculation means for calculating an average value of the signal points, and desired signal power for selecting a signal point used for calculating a desired signal power from the signal points Signal point selecting means for calculation, desired signal power calculating means for calculating a desired signal power for each of the signal points selected for calculating the desired signal power, and a desired signal for calculating an average value of the desired signal power Power average value calculation means, interference signal power calculation signal point selection means for selecting a signal point used for calculating interference signal power from the signal points, and selected for calculating the interference signal power signal Interference signal power calculation means for calculating the interference signal power for each of, the interference signal power average value calculation means for calculating the average value of the interference signal power, the average value of the desired signal power and the average value of the interference signal power And SIR calculation means for calculating the ratio of

According to the present invention, the desired signal power and the interference signal power are not calculated using all the received signal points, but only the signal points selected from the received signal points are used. By calculating the power and calculating the interference signal power using only the signal points selected from the received signal points, the SIR determination error rate can be reduced. The combination of signal points used to calculate the desired signal power and the combination of signal points used to calculate the interference signal power may be the same or different.

Further, in the above invention, a first combination and a second combination are extracted from a combination of a plurality of signal points, and the first combination is sent to the desired signal power calculation signal point selecting means. , The second combination is sent to the interference signal power calculation signal point selection means, the SIR calculated by the SIR calculation means is stored, and the stored SIR and the SIR sequentially calculated by the SIR calculation means are stored. It is preferable to include a signal point selection control unit that compares the SIRs and stores the SIR determined to be smaller as a result of the comparison as the minimum SIR.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. This embodiment is the case of 16QAM.

FIG. 1 shows an SIR according to an embodiment of the present invention.
FIG. 2 is a functional block diagram showing the configuration of the measuring apparatus, and FIG. 2 is a flowchart showing a processing flow of the SIR measuring method in the embodiment of the present invention.

As shown in FIG. 1, S according to the embodiment
The IR measuring device includes (a) a receiving unit 10 that receives a signal,
(B) a hard decision unit 12 that makes a hard decision of each signal point received by the reception unit 10, (c) a signal point average value calculation unit 14 that calculates the average value of each received signal point, and (d) a request A desired signal power calculation signal point selection unit 16 that selects a signal point used to calculate the signal power, and (e) a desire to calculate the desired signal power for each of the signal points selected for the desired signal power calculation. A signal power calculation unit 18, (f) a desired signal power average value calculation unit 20 for calculating an average value of the calculated desired signal powers, and (g) interference for selecting a signal point used for calculating an interference signal power. A signal point calculation signal point selection unit 22, (h) an interference signal power calculation unit 24 that calculates interference signal power for each of the signal points selected for interference signal power calculation, and (i) calculated Calculate the average value of the interfering signal power And interference signal power average calculation section 26,
(J) An SIR calculator 28 that calculates a ratio between the desired signal power average value and the interference signal power average value.

The hard decision unit 12 divides the received signal S _i (1 ≦ i ≦ N) into an in-phase component S _i ^I and a quadrature component S _i ^Q in step S101. The hard decision unit 12 performs step S1.
In 03, absolute values S _i ^I and S _i ^Q of each component are calculated. The correspondence between S _i ^I and S _i ^Q is shown in Table 1 below.

[0015]

[Table 1] The hard decision unit 12 makes a hard decision on the signal point in step S105. The phase and amplitude of the received signal used for hard decision are the pilot signal, AGC (Automatic G
ain Control), AFC (Automati)
c Frequency Control), Join
t Detection and SingleUser De
It can be determined by the method according to the section. The hard decision when the power average is 1 and the phase is compensated by the above method is shown in Table 2 below. Table 2 below shows a case where the signal points of 16QAM at the time of transmission are as shown in FIG. 3 when the average power is 1. At each sample point, a signal point P _i = {1,2,3,4} is determined. In addition, the number of each signal point determined by the hard decision is N ₁ , N ₂ , N ₃ , N
₄ (N = N ₁ + N ₂ + N ₃ + N ₄ ).

[0016]

[Table 2] The signal point average value calculation unit 14 calculates an average value for each signal point in step S107. The average value calculation formula is shown below.

[0017]

[Equation 1] The desired signal power calculation signal point selection unit 16 selects a desired signal power calculation signal point.

The desired signal power calculator 18 operates in step S1.
At 09, the desired signal power is calculated. The desired signal power calculation formula is shown below.

[0019]

[Equation 2] The desired signal power calculation is performed on the signal point selected by the desired signal power calculation signal point selection unit 16. The signal point selected by the desired signal power calculation signal point selection unit 16 and the signal point selected by the interference signal power calculation signal point selection unit 22 to be described later are determined in advance.

These signal points are preferably determined so that the SIR measurement value becomes the smallest. The method of determining the signal point with the smallest SIR measurement value will be described later.

In this embodiment, all signal points are used as desired signal power calculation signal points. On the other hand, as described later, the interference signal power calculation signal points are P ₁ , P ₂ ,
Only P ₃ is used and P ₄ is not used. In this way, the signal points selected by the desired signal power calculation signal point selection unit 16 are
The signal point may be different from the signal point selected by the interference signal power calculation signal point selection unit 22 described later. However, this does not mean that they have to be different, and both signal points may be the same.

The desired signal power average value calculation unit 20 calculates the average value of the desired signal power in step S111.
In this embodiment, since the average value of the desired signal power is calculated using all the signal points, the calculation formula is as follows.

[0023]

## EQU00003 ## Ps = (P_{s, 1}* N₁+ P_{s, 2}* N_Two+ P
_{s, 3}* N_Three+ P_{s, 4}* N _Four) / N The interference signal power calculation signal point selection unit 22 determines the desired signal power.
Select signal points for calculation. Interference signal power calculation, interference
The signal point selected by the signal power calculation signal point selection unit 22
Be done.

In the present embodiment, only P ₁ , P ₂ , and P ₃ are used as the interference signal power calculation signal points, and P ₄ is not used. That is, the signal point selected by the interference signal power calculation signal point selection unit 22 is different from the signal point selected by the desired signal power calculation signal point selection unit 16. However, the signal point selected by the interference signal power calculation signal point selection unit 22 may be the same as the signal point selected by the desired signal power calculation signal point selection unit 16.

The interfering signal power calculator 24 operates in step S1.
At 13, for each signal point, the interference signal power is calculated from the difference between the received signal and the average value. The interference signal power calculation formula is shown below.

[0026]

[Equation 4] The interference signal power average value calculation unit 26 calculates the average value of the interference signal power in step S115. In the present embodiment, the average value of the interference signal powers is calculated using only the interference signal powers _{Pn, 1} , _{Pn, 2} , _{Pn , 3,} so the calculation formula is as follows.

[0027]

(5) Pn = (P_{n, 1}* N₁+ P_{n, 2}* N_Two+ P
_{n, 3}* N_Three) / (N₁+ N _Two+ N_Three) The SIR calculator 28 determines the SIR in step S117.
To calculate. The calculation formula is shown below.

[0028]

## EQU6 ## SIR = Ps / Pn When the signal point average value calculating unit 14 obtains the average value in step S107, the signal points may be combined to calculate the average value. In the present embodiment using the 16QAM, the average value _{S 0, 3} ^Q of the quadrature component of the average value _{S 0, 1} ^Q and the signal point _{p 3} of the quadrature component of the signal point _{p 1} is equal, the signal point _{p 2}
It can be assumed that the average value S _0,2 ^Q of the orthogonal components of S and the average value S _0,4 ^Q of the orthogonal components of the signal point p ₄ are equal. The average value _{S 0, 2} ^I of the average value _{S 0, 1} ^I-phase component of the signal point _{p 2} of the in-phase component of the signal point _{p 1} is equal, the average value _{S 0} of the in-phase component of the signal point _{p 3,} The average value S _0,4 ^I of the in-phase components of ₃ ^I and the signal point p ₄ may be equal to each other. Considering this relationship, the following formula is established.

[0029]

[Equation 7] Next, using the specific numerical values shown in FIG.
The R measurement process will be described. As shown in FIG. 4, received signals (i, S _i ) = (1, 0.1 + 0.2i), (2,
0.3-0.7i), (3, -0.8-0.9i),
(4, -0.7 + 0.4i), (5, -0.3 + 0.4)
i), (6, -0.6-0.9i), (7, -0.9+)
0.6i) and (8, 0.7 + 0.7i).

When each signal is divided into an in-phase component S _i ^I and a quadrature component S _i ^Q in step S101, as shown in FIG. 4, (i, S _i ^I , S _i ^Q ) = (1, 0.1, 0.
2), (2, 0.3, -0.7), (3, -0.8,
-0.9), (4, -0.7, 0.4), (5,-
0.3, 0.4), (6, -0.6, -0.9),
(7, -0.9, 0.6), (8, 0.7, 0.
7).

When the absolute value of each component is obtained in step S103, as shown in FIG. 4, (i, S _i ^I ,
S _i ^Q ) = (1,0.1,0.2), (2,0.3,
0.7), (3, 0.8, 0.9), (4, 0.7,
0.4), (5,0.3,0.4), (6,0.6,
0.9), (7, 0.9, 0.6), (8, 0.7,
0.7).

When a hard decision is made for each signal point in step S105, as shown in FIG. 4, (i, pi) =
(1,4), (2,3), (3,1), (4,2),
(5,4), (6,3), (7,2), (8,1).

In step S107, an average value is calculated for each component for each signal point having the same hard decision result,
As shown in FIG. 4, (j, S _{0, j} ^I , S _{0, j} ^Q ) =
(1, 0.75, 0.8), (2, 0.8, 0.5),
(3, 0.45, 0.8) and (4, 0.2, 0.3).

When the desired signal power is obtained for each signal point having the same hard decision result in steps S109 and S111, as shown in FIG. 4, (j, P _{s, j} ) = (1, 1.2),
(2, 0.89), (3, 0.84), (4, 0.1
3), and the average value is P _s = 0.766.

When the average value of the interference signal power is obtained in steps S113 and 115, as shown in FIG. 4, P _N =
It becomes 0.022.

When the SIR is obtained in step S117, SIR = P _s / P _N = 0.766 / 0.022 = 3
It becomes 5.365.

In the present embodiment, the desired signal power is calculated first (steps S109, 111) and then the interference signal power is calculated (steps S113, 1).
15). However, the present invention is not limited to such an embodiment, and the interference signal power may be calculated first, and then the desired signal power may be calculated.

Next, with reference to FIG. 5, an example of a method for determining a signal point used for calculating the desired signal power and a signal point used for calculating the interference signal power will be described.

The signal point selection control unit 30 determines such signal points. The signal point selection control unit 30 (1) extracts a combination of signal points from a plurality of candidates and causes the signal point selection units 16 and 22 to select the extracted combination,
(2) Record the SIR for each combination, and
Compared with IR, the smaller SIR is continuously recorded in the minimum SIR table, and (3) finally, the combination of signal points recorded in the minimum SIR signal point table is used as S
Determined as the combination of signal points used in IR measurement.

In step S201, (1) minimum S
A minimum SIR table for recording the IR, and (2) recording a desired signal power signal point used when calculating the minimum SIR and an interference signal power signal point used when calculating the minimum SIR. Empty each minimum SIR signal point table.

In step S203, step S1
Similar to 01, the received signal is divided into an in-phase component and a quadrature component.

In step S205, step S1
Similar to 03, the absolute values of the in-phase component and the quadrature component are calculated.

In step S207, step S1
Similar to 05, the hard decision of the signal point is made from the absolute value of the in-phase component and the absolute value of the quadrature component.

In step S209, step S1
Similar to 07, an average value is calculated for each hard-decision signal point.

In step S211, a combination candidate of signal points used for calculating the desired signal power and a combination candidate of signal points used for calculating the interference signal power are selected.

In the case of 16QAM, there are the following 15 combinations of signal points. (Signal point 1), (Signal point 2), (Signal point 3), (Signal point 4), (Signal point 1 and signal point 2), (Signal point 1 and signal point 3), (Signal point 1 and signal (Point 4), (Signal point 2 and Signal point 3), (Signal point 2 and Signal point 4), (Signal point 3 and Signal point 4), (Signal point 1 and Signal point 2
And signal point 3), (signal point 1 and signal point 2 and signal point 4),
(Signal point 1, signal point 3, and signal point 4), (signal point 2, signal point 3, and signal point 4), (signal point 1, signal point 2, signal point 3, and signal point 4).

The signal point selection control unit 30 causes the desired signal power calculation signal point selection unit 16 to select any one of the above 15 combinations, and also causes the interference signal power calculation signal point selection unit 22 to select.

For example, the desired signal power calculation signal point selection section 16 is caused to select (signal point 1 and signal point 2), and the interference signal power calculation signal point selection section 22 is set to (signal point 1 and signal point 3). Select.

The desired signal power calculation signal point selection unit 1
6 and the interference signal power calculation signal point selection unit 22 may select the same combination of signal points. For example, the desired signal power calculation signal point selection unit 16 and the interference signal power calculation signal point selection unit 22 may be caused to select (signal point 1, signal point 2, and signal point 3).

In step S213, the average value of the desired signal power is calculated using the signal points selected by the desired signal power calculation signal point selection unit 16 as in steps S109 and S111. Further, by using the signal points selected by the interference signal power calculation signal point selection unit 222, step S11
Similar to 3, S115, the average value of the interference signal power is calculated.

In step S215, the SIR calculator 28 calculates the ratio between the average value of the desired signal power and the average value of the interference signal power to obtain the SIR.

In step S217, step S2
It is determined whether the calculation of 15 is the first calculation. If "NO", the process proceeds to step S219, and if "YES", the process proceeds to step S221.

In step S219, step S2
The SIR calculated in step S15 is compared with the SIR recorded in the minimum SIR table to determine whether the SIR calculated in step S215 is smaller than the SIR recorded in the minimum SIR table. If “NO”, the process proceeds to step S221. If “NO”, the process proceeds to step S223.

In step S221, (1) the SIR calculated in step S215 is stored in the minimum SIR table, and (2) a combination of desired signal power calculation signal points and interference signal power calculation signal points used in such calculation. Are recorded in the minimum SIR signal table.

In step S223, it is determined whether SIR has been calculated for all combinations of signal points,
If “YES”, the process proceeds to step S225, and “N
If “O”, the process returns to step S211. Since there are 15 combinations of desired signal power calculation signal points and 15 combinations of interference signal power calculation signal points, there are a total of 15 combinations of desired signal power calculation signal points and interference signal power calculation signal points. * 15 = 225 ways.

In the present embodiment, the SIR is calculated for all combinations and the minimum SIR is searched out of the SIR, but it is not always necessary to calculate for all combinations. For example, since the characteristics of the signal point 2 and the signal point 3 are similar, either one of the signal point 2 or the signal point 3 may be omitted in consideration of this point.

That is, omitting the signal point 3, (signal point 1), (signal point 2), (signal point 4), (signal point 1 and signal point 2), (signal point 1 and signal point 4) , (Signal point 2 and signal point 4) and (signal point 1, signal point 2 and signal point 4) may be used. In this case, there are 7 combinations of desired signal power calculation signal points and 7 combinations of interference signal power calculation signal points.
There are a total of 7 * 7 = 49 combinations of desired signal power calculation signal points and interference signal power calculation signal points.

The type of combination of signal points for calculating desired signal power and the type of combination of signal points for calculating interference signal power need not be the same.

For example, the combinations of signal points for calculating the desired signal power are (signal point 1, signal point 2 and signal point 3), (signal point 1 and signal point 2 and signal point 4), (signal point 1 and signal point). Point 3 and signal point 4), (signal point 2 and signal point 3 and signal point 4), (signal point 1 and signal point 2, signal point 3 and signal point 4), and the interference signal The combination of signal points for power calculation is (signal point 1 and signal point 2), (signal point 1 and signal point 2), except for the innermost signal point 4 that is likely to cause the SIR determination error rate to increase. 3), (signal point 2 and signal point 3), and (signal point 1 and signal point 2 and signal point 3).

In step S225, the combination of signal points recorded in the minimum SIR signal point table is set to
It is determined as a combination of signal points used in the subsequent SIR measurement. In the present embodiment, SIRs are calculated for all combinations, and the combination of signal points finally recorded in the minimum SIR signal table is the combination of signal points for desired signal power calculation = (signal point 1 and signal point 2 and signal point 3 and signal point 4), and a combination of interference signal power calculation signal points = (signal point 1, signal point 2 and signal point 3).

The combination of the signal points for calculating the desired signal power and the combination of the signal points for calculating the interference signal power are determined at the beginning of communication, when the propagation environment greatly changes during communication, or predetermined. It may be appropriately performed at time intervals.

Further, the correspondence between the propagation environment and the signal points used in the calculation may be recorded as a table, and the signal points used may be changed according to the change in the propagation environment. For example, when SIR is large, use all signal points,
When the SIR is small, signal points (signal point 1, signal point 2, and signal point 3) other than the inner signal point (signal point 4) shown in FIG. 3 may be used. The propagation environment includes the fading frequency and the number of signals arriving at the receiving unit.

FIG. 6 shows the SIR determination error rate by computer simulation for each of the case of using this embodiment and the case of using the conventional technique. Figure 7
A list of specifications for computer simulation is shown in. As shown in FIG. 6, this embodiment can improve the SIR decision error rate.

The program for causing a computer to execute each step required in the above SIR measuring method is recorded in a recording medium, and the computer reads and executes the program, thereby realizing the above SIR measuring method. be able to. Here, as the recording medium,
For example, a device such as a memory device, a magnetic disk device, an optical disk device, or a magnetic tape device that can record a program is included.

FIG. 8 is a schematic view showing an example of a computer system which reads a program stored in these recording media and realizes data processing according to the steps described therein. As shown in FIG. 8, examples of the recording medium readable by the computer system 85 include a floppy disk 86, a compact disk 87, an IC chip 88, a cassette tape 89, and the like. According to the computer-readable recording medium in which the SIR measurement program is recorded, the SIR measurement program can be easily stored, transported, and sold.

[0066]

As described above, according to the present invention, the SIR decision error rate can be improved by selecting a combination of desired signal power calculation signal points and a combination of interference signal power calculation signal points. It will be possible.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing a configuration of an SIR measuring device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing flow of an SIR measuring method according to the embodiment of the present invention.

FIG. 3 is a signal point arrangement diagram according to the embodiment of the present invention.

FIG. 4 is a table showing specific contents of calculation processing according to the embodiment of the present invention.

FIG. 5 is a flowchart showing a flow of processing for determining a signal point used for calculation of desired signal power and a signal point used for calculation of interference signal power according to the embodiment of the present invention.

FIG. 6 is a graph showing the SIR decision error rate by computer simulation for each of the case of using the embodiment of the present invention and the case of using the conventional technique. .

7 is a list of specifications of the computer simulation shown in FIG.

FIG. 8 is a diagram showing a computer-readable recording medium for recording the SIR measurement program according to the embodiment of the present invention.

FIG. 9 is a flowchart showing a processing flow of an SIR measuring method in the conventional embodiment.

[Explanation of symbols]

10 Receiver 12 Hard decision part 14 Signal point average value calculation unit 16 Desired signal power calculation signal point selector 18 Desired signal power calculator 20 Desired signal power average value calculator 22 Interference signal power calculation signal point selector 24 Interference signal power calculator 26 Interference signal power average value calculator 28 SIR calculator 30 Signal point selection control unit

Claims (8)

[Claims] 1. Receiving means for receiving a signal, hard decision means for performing a hard decision of each signal point received by the receiving means, and signal point average value calculating means for calculating an average value of each signal point, A desired signal power calculation signal point selecting means for selecting a signal point used for calculating a desired signal power from the signal points, and a desired signal for each of the signal points selected for calculating the desired signal power A desired signal power calculation means for calculating power, a desired signal power average value calculation means for calculating an average value of the desired signal power, and a signal point used for calculating the interference signal power from the signal points is selected. Interference signal power calculation signal point selection means, interference signal power calculation means for calculating interference signal power for each of the signal points selected for calculating the interference signal power, and the interference signal power And interference signal power average value calculating means for calculating the average value, SIR measuring apparatus and a SIR calculating means for calculating a ratio of the average value of the desired signal power and the average value of the interference signal power. 2. A first combination and a second combination are extracted from a combination of a plurality of signal points, and the first combination is sent to the desired signal power calculation signal point selecting means, The combination of two is sent to the interference signal power calculation signal point selection means, the SIR calculated by the SIR calculation means is stored, and the stored SIR is compared with the SIR sequentially calculated by the SIR calculation means. , The SIR determined to be smaller as a result of comparison is the minimum SIR
2. A signal point selection control means for storing as
The SIR measurement device described. 3. A step of receiving a signal, a step of making a hard decision on each of the received signal points, a step of calculating an average value of the signal points, and a step of calculating a desired signal power from the signal points. A step of selecting a signal point to be used for calculating the desired signal power, a step of calculating a desired signal power for each of the signal points selected to calculate the desired signal power, and a step of calculating an average value of the desired signal power. A step of selecting a signal point used for calculating an interference signal power from the signal points, and a step of calculating an interference signal power for each of the signal points selected for calculating the interference signal power, Calculating an average value of the interference signal power, and calculating a ratio between the average value of the desired signal power and the average value of the interference signal power. Mu SIR measurement method. 4. A step of extracting a first combination and a second combination from a combination of a plurality of signal points; a step of using the first combination for calculation of the desired signal power; Using a combination of two in the calculation of the interference signal power; storing the calculated SIR; comparing the stored SIR with the sequentially calculated SIR; Storing the stored SIR as the minimum SIR.
Measuring method. 5. A computer receiving a signal, performing a hard decision on each received signal point, calculating an average value of each signal point, and selecting a desired signal from the signal points. Selecting a signal point used for calculating power, calculating a desired signal power for each of the selected signal points for calculating the desired signal power, and calculating an average value of the desired signal power And a step of selecting a signal point used for calculating an interference signal power from the signal points, and calculating an interference signal power for each of the signal points selected for calculating the interference signal power. Calculating an average value of the interference signal power, and calculating a ratio of the average value of the desired signal power and the average value of the interference signal power. SI for performing the steps, the
R measurement program. 6. A step of causing a computer to extract a first combination and a second combination from a combination of a plurality of signal points, and a step of using the first combination for calculation of the desired signal power. , Using the second combination in the calculation of the interference signal power, storing the calculated SIR, comparing the stored SIR with sequentially calculated SIRs, Storing the determined SIR as the minimum SIR.
The SIR measurement program described. 7. A computer receiving a signal, performing a hard decision on each received signal point, calculating an average value of each signal point, and selecting a desired signal from the signal points. Selecting a signal point used for calculating power, calculating a desired signal power for each of the selected signal points for calculating the desired signal power, and calculating an average value of the desired signal power And a step of selecting a signal point used for calculating an interference signal power from the signal points, and calculating an interference signal power for each of the signal points selected for calculating the interference signal power. Calculating an average value of the interference signal power, and calculating a ratio of the average value of the desired signal power and the average value of the interference signal power. Steps and, readable computer recording the SIR measurement program for executing a recording medium. 8. A step of causing a computer to extract a first combination and a second combination from a combination of a plurality of signal points, and a step of causing the computer to use the first combination for calculation of the desired signal power. , Using the second combination in the calculation of the interference signal power, storing the calculated SIR, comparing the stored SIR with sequentially calculated SIRs, 8. The computer-readable recording medium according to claim 7, wherein the SIR measurement program for executing the step of storing the determined SIR as the minimum SIR is recorded.