JP2003324367A - Apparatus and method for radio reception - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for radio reception which can reduce the quantity of arithmetic processing for electric power comparison with a CPICH in reception processing of a PICH or an AICH. <P>SOLUTION: The radio receiving apparatus 100 includes a 1st calculating means of calculating the square value of a signal after RAKE combination of the PICH or the AICH, a 2nd calculating means of calculating the value obtained by squaring the sum of squares of phase estimated values of the CPICH of respective fingers 103, and a comparative arithmetic part 108 which computes the ratio between the value from the calculating means and the value from the 2nd calculating means. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio receiving apparatus and method, and more particularly to code division multiple access (Code Div).
sion Multiple Access;
The present invention relates to a wireless receiving device and method used for "CDMA") communication.

[0002]

2. Description of the Related Art In recent years, the demand for land mobile communication systems such as automobiles and mobile phones has increased remarkably, so that a large amount of subscriber capacity can be secured in a limited frequency band together with high-speed and high-quality data transmission. Therefore, effective use technology of frequency is important.

The CDMA system has attracted attention as one of multiple access systems for effective use of frequencies. The CDMA system is a multiple access system using spread spectrum communication technology, and is characterized by being less susceptible to the effects of multipath distortion and by performing RAKE reception, a diversity effect can also be expected.

Here, the RAKE reception will be outlined. In mobile communication, the direct wave that the transmission wave from the transmitting station directly arrives at the receiving station, and the reflected wave that the transmission wave from the transmitting station arrives at the receiving station after being reflected by a building are received by combining. Will be done. In this case, since there are many paths for the reflected wave, there are many paths (multipath).
The reflected wave of is received. Therefore, the receiving station receives the composite wave of the received signals that have passed through many paths, but these received signals have the propagation delay time due to each path. As a result, in the receiving station, received signals interfere with each other to cause fading.

The spread code of the CDMA system has a small autocorrelation when it is offset in time. Utilizing this, in the despreading unit, when despreading is performed with a spreading code given a phase offset corresponding to the propagation delay time,
It is possible to obtain the received signal having the propagation delay time corresponding to the phase offset. That is, by giving a phase offset corresponding to the propagation delay time to the phase of the spread code, it is possible to acquire each of the received signals without causing mutual interference. Therefore,
A plurality of despreading units are provided in parallel, and in each despreading unit, despreading processing is performed using a spreading code that gives a phase offset corresponding to the propagation delay time of the received signal, so that the received signals of the multiple propagation paths Can be obtained independently.

A good demodulated signal can be obtained by adding a certain weight to the plurality of received signals obtained in this way and adding and combining them. The method of receiving in this way is called RAKE reception, and since received signals from a plurality of paths can be selectively despread and combined,
It is capable of performing path diversity reception.

On the other hand, at present, 3GPP (3rd Gene)
relation Partnership Projec
In the CDMA communication system whose standardization activity is underway in t), the common pilot channel (CPICH:
There is a channel called Common PIlot Channel). The CPICH is a channel that always transmits a signal of known information. By using this CPICH, the mobile device can perform channel estimation and perform synchronous detection even for a communication channel that does not include pilot symbols.

Also, among the physical channels, the PICH
(Padding Indicator Channel)
And AICH (Acquisition Indica)
tor Channel). At the time of receiving these PICH and AICH, the received power value of CPICH is compared with a certain threshold level, and if the received power value of CPICH is above a certain threshold level, it is judged to have been received normally, Interpret the sign.

Further, as a transmission diversity method for PICH and AICH, STTD (Space time b) is used.
lock coding based transmi
tantenna diversity). In this STTD, encoded signals are respectively transmitted from two antennas (antenna 0 and antenna 1). Note that the following description will be made for the PICH, but the same applies to the AICH.

Next, an example of a conventional radio receiver will be described with reference to the drawings. FIG. 6 is a block diagram showing the configuration of a conventional wireless receiver.

As shown in FIG. 6, a conventional radio receiver 6
00 is an AD converter 601, a plurality of fingers 602, a normalizing unit 603, a RAKE combining unit 604, and a power measuring unit 60.
5, a power calculation unit 606 and a ratio calculation unit 607 are provided. Each of the plurality of fingers 602 includes a despreader 602-.
1, 602-2, a phase estimation unit 602-3, and a synchronous detector 602-4.

In this radio receiving apparatus 600, the received PICH despread signal is synchronously detected, RAKE-combined, the squared value of the RAKE-combined signal is used as the power of PICH, and the CPICH despread signal is Squared value is CPI
It is calculated as the received power of CH, and the ratio calculation unit 607 calculates the ratio of the power of these PICH and the received power of CPICH.

In this case, in order to calculate the reception power of the PICH, the normalization unit 603 divides each phase estimation value of each finger 602 by the sum of the magnitudes of the phase estimation values of each finger 602. Must be given to the synchronous detection unit 602-4. In this process, each finger 60
It is necessary to perform the following division of (Equation 1) on the phase estimation value of 2.

[0014]

[Equation 1] Here, ξ (l, m) is m of the l-th finger 602.
The estimated phase value at the slot is shown.

[0015]

However, in conventional radio receiving apparatus 600, normalizing section 603 divides each phase estimation value of each finger 602 by the sum of the magnitudes of the phase estimation values of each finger 602. It is necessary to apply the calculated value to the synchronous detection unit 602-4, and this processing needs to perform the division of (Equation 1) with respect to the phase estimated value of each finger 602, so that the calculation processing amount is large. There are challenges.

The present invention has been made in view of the above points, and a CP in the reception processing of the PICH or AICH.
An object of the present invention is to provide a wireless reception device and method capable of reducing the amount of calculation processing for power comparison with ICH.

[0017]

SUMMARY OF THE INVENTION A radio receiving apparatus according to the present invention uses two signals after RAKE combining of PICH or AICH.
First calculating means for calculating a multiplier and CPI of each finger
Second calculation of a value obtained by squaring the sum of squares of the phase estimation value of CH
Of the second calculation means and the value from the first calculation means.
Ratio calculating means for calculating the ratio of the values from the calculating means.

According to this configuration, it is possible to measure the power ratio of PICH or AICH and CPICH without compensating for the RAKE weight, and it is possible to reduce the amount of arithmetic processing by eliminating the need for division.

The radio receiving apparatus according to the present invention receives PIC at the time of receiving PICH or AICH at the time of transmission diversity.
First calculating means for calculating the square value of the signal after RAKE combining of H or AICH, and C of each finger and each antenna
Second calculation means for calculating a value obtained by squaring the sum of squares of the estimated phase value of the PICH, and ratio calculation for calculating the ratio of the value from the first calculation means and the value from the second calculation means. Means and
The configuration including is adopted.

According to this configuration, it is possible to measure the power ratio between PICH or AICH and CPICH without compensating for the RAKE weight, and it is possible to reduce the amount of calculation processing by eliminating the division.

The radio receiving apparatus of the present invention is a PICH or A
A first calculation means for calculating a squared value of a signal obtained by compensating a RAKE weight on a signal after RAKE combining of ICH;
A configuration is provided that includes a second calculation unit that calculates the value of the ICH power, and a ratio calculation unit that calculates the ratio of the value from the first calculation unit and the value from the second calculation unit. .

According to this configuration, the RA with reduced processing amount
Performs KE weight compensation, PICH or AICH and CPI
Since the reception power ratio with CH can be measured, the amount of calculation processing can be reduced.

The radio receiving apparatus of the present invention is at the time of transmission diversity and when receiving the 2-bit PICH, the CPICH and the CCH at the same timing as the PICH.
CP using CPICH of 1 symbol before and after PICH
A configuration including means for measuring the received power of the ICH is adopted.

According to this structure, when the transmission diversity is performed and the 2-bit PICH is received, the PI is
Antenna separation is performed using the CPICH at the same timing as the CH and the one-symbol CPICH before and after the CH
By measuring the received power of the CH, it is possible to measure the received power ratio of the PICH and the CPICH without performing the RAKE weight compensation, so that it is possible to reduce the calculation processing amount.

The radio receiving apparatus of the present invention adopts the above-mentioned configuration, which is provided with means for changing the number of power measurement symbols according to the moving speed or the reception quality of the mobile station.

According to this structure, when the transmission diversity is performed and the 2-bit PICH is received, the PI is
Antenna separation is performed using the CPICH at the same timing as the CH and the one-symbol CPICH before and after the CH
By measuring the received power of the CH, it is possible to measure the received power ratio of the PICH and the CPICH without performing the RAKE weight compensation, so that it is possible to reduce the calculation processing amount. Further, according to this configuration, the number of power measurement symbols can be changed according to the moving speed or the reception quality of the mobile station, so that an accurate calculation can be performed.

The radio receiving apparatus of the present invention, at the time of transmission diversity, and at the time of receiving the 2-bit PICH, the PICH symbol is one symbol before the signal and ST.
When TD-encoded, a control means for controlling to perform despreading from one symbol before the demodulation target symbol and a synchronous detection means for outputting only the latter half symbol after STTD decoding are adopted.

According to this configuration, the CPICH is controlled by controlling the despreading start timing and the despreading target range.
Since the antenna can be separated and the power can be measured, the amount of calculation processing can be reduced. Further, according to this configuration, STTD-encoded PIC
It is possible to demodulate H.

The communication apparatus of the present invention has a configuration including the wireless receiving apparatus.

With this configuration, it is possible to obtain a communication device having the above effects.

The mobile communication system of the present invention has a configuration including the radio receiving device.

According to this structure, it is possible to obtain a mobile communication system having the above effects.

The radio receiving method of the present invention is based on the PICH or A
First calculation of squared value of signal after RAKE combining of ICH
And a second calculation step of calculating a value obtained by squaring the sum of squares of the CPICH phase estimation values of the fingers, a value calculated in the first calculation step, and the second calculation step. The ratio calculation step of calculating the ratio of the values calculated in 1.

According to this method, it is possible to measure the power ratio between PICH or AICH and CPICH without compensating for the RAKE weight, and it is possible to reduce the amount of arithmetic processing by eliminating the need for division.

The radio receiving method according to the present invention uses the PIC when receiving the PICH or AICH at the time of transmission diversity.
A first calculation step of calculating a square value of a signal after RAKE combining of H or AICH, and a second calculation of calculating a value obtained by squaring a sum of squares of phase estimation values of CPICH of each finger and each antenna. And a ratio calculation step of calculating a ratio between the value calculated in the first calculation step and the value calculated in the second calculation step.

According to this method, it is possible to measure the power ratio between PICH or AICH and CPICH without compensating for the RAKE weight, and it is possible to reduce the amount of calculation processing by eliminating the division.

The radio receiving method of the present invention is implemented by PICH or A
A first calculation step of calculating a square value of a signal obtained by performing RAKE weight compensation on the signal after RAKE combining of ICH;
A second calculation step for calculating the value of the power of CPICH; and a ratio calculation step for calculating the ratio of the value calculated in the first calculation step and the value calculated in the second calculation step. I decided to do it.

According to this method, RA with reduced processing amount
Performs KE weight compensation, PICH or AICH and CPI
Since the reception power ratio with CH can be measured, the amount of calculation processing can be reduced.

According to the radio receiving method of the present invention, when the transmission diversity is performed and the 2-bit PICH is received, the CPICH and the CICH at the same timing as the PICH are received.
CP using CPICH of 1 symbol before and after PICH
A step of measuring the received power of the ICH is provided.

According to this method, when the transmission diversity is performed and the 2-bit PICH is received, the PI
Antenna separation is performed using the CPICH at the same timing as the CH and the one-symbol CPICH before and after the CH
By measuring the received power of the CH, it is possible to measure the received power ratio of the PICH and the CPICH without performing the RAKE weight compensation, so that it is possible to reduce the calculation processing amount.

[0041]

BEST MODE FOR CARRYING OUT THE INVENTION The essence of the present invention is PICH or A.
This is to calculate the square value of the signal after the RAKE combination of ICH, calculate the value obtained by squaring the sum of squares of the phase estimation value of the CPICH of each finger, and calculate the ratio of these values.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

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

As shown in FIG. 1, the first embodiment of the present invention
The wireless receiver 100 according to the present invention includes an AD converter 101, a controller 102, a plurality of fingers 103, and a RAKE combiner 10.
It is provided with a square sum calculation unit 105, square calculation units 106 and 107, and a ratio calculation unit 108. Multiple fingers 10
Each of 3 has despreading sections 103-1 and 103-2, a phase estimation section 103-3 and a coherent detection section 103-4.

The control unit 102 includes the despreading units 103-1 and 1-1.
03-2 and the phase estimation unit 103-3.
The input terminals of the despreading units 103-1 and 103-2 are connected to the output terminal of the AD converter 101. Phase estimation unit 1
The input terminal of 03-3 is connected to the output terminal of the despreading unit 103-1. The input terminal of the synchronous detection unit 103-4 is connected to the output terminal of the despreading unit 103-2.
Moreover, the input terminal of the synchronous detection unit 103-4 is connected to the output terminal of the phase estimation unit 103-3.

The input terminal of the RAKE combiner 104 is connected to the output terminal of the synchronous detector 103-4. The input terminal of the sum of squares calculation unit 105 is connected to the output terminal of the phase estimation unit 103-3. The input terminal of the square calculation unit 106 is connected to the output terminal of the square sum calculation unit 105.
The input terminal of the square calculation unit 107 is the RAKE combining unit 104.
Is connected to the output terminal of. The input terminals of the ratio calculator 108 are the RAKE combiner 104 and the square calculator 106, 1
07 is connected to the output terminal.

The AD converter 101 converts the received analog reception signal into a digital reception signal. The control unit 102 controls the operation timing of the despreading units 103-1 and 103-2 and the despreading code in accordance with the PICH timing of the received signal to be received. Despreader 103-1,
103-2 despreads the received signal from the AD converter 101. The phase estimation unit 103-3 includes a despreading unit 103-1.
To calculate the phase estimate by averaging one or more symbols of CPICH in the despread signal from Synchronous detection unit 10
3-4 calculates the complex conjugate number of the phase estimation value output by the phase estimation unit 103-3, and the complex conjugate number is calculated by the despreading unit 10.
Phase compensation and RAKE weighting are performed by multiplying the despread signals from 3-1 and 103-2.

The RAKE combiner 104 combines the synchronous detection outputs from the synchronous detectors 103-4 of the plurality of fingers 103. The sum of squares calculation unit 105 includes a plurality of fingers 10
The squared value of each phase estimation value of 3 is calculated, and the sum of the squared values of these phase estimated values is calculated. The square calculation unit 106
The square of the output of the multiplication sum calculation unit 105 is calculated. The square calculation unit 107 calculates the square of the RAKE combined signal from the RAKE combining unit 104. The ratio calculation unit 108 calculates the ratio between the value from the square calculation unit 106 and the value from the square calculation unit 107 to compare the received powers of the PICH and CPICH, so that the received power of the PICH is a threshold value. When it is above the level, the sign is judged.

Here, each calculation will be described in detail.

In the following equation, S _c represents the transmission amplitude of CPICH, and S _a represents the transmission amplitude of PICH. Further, α _xy represents a propagation coefficient when the path number (finger number) is x and the base station antenna number is y.

The received despread signal of the PICH is represented by α _xy S _a . The received signal of CPICH is represented by α _xy S _c , which is the same value as the output of the phase estimation unit 103-3. Therefore, the RAKE combined signal of PICH is P
Since it is obtained by multiplying the despread signal of ICH by the complex conjugate number of the phase estimation value of CPICH, (α ₀₀ ² + α ₁₀ ² +, ...,
+ Α _N-10 ² ) It is represented by S _a S _c . This squared value is (α ₀₀ ²
+ Α ₁₀ ² +, ..., + α _{N -10} ) ² _Sa ² S _c ² . This is 2
This is the output of the power calculation unit 107.

On the other hand, the phase estimation value of each finger 103 is 2
The sum of products is represented by (α ₀₀ ² + α ₁₀ ² +, ..., + α _N-10 ² ) S _c ² , and its squared value is (α ₀₀ ² + α ₁₀ ² +, ..., + α _N-10
² ) _Represented by ² _Sc ⁴ . This is the output of the square calculation unit 106. The ratio calculation unit 108 calculates the following (Formula 2).

[0053]

[Equation 2] The value represented by this (Equation 2) becomes the same value as when the powers of the PICH and CPICH are being compared.

As described above, according to the first embodiment of the present invention, it is possible to measure the power ratio of PICH and CPICH without compensating for the RAKE weight, and it is possible to reduce the amount of calculation processing by eliminating the division. it can.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a block diagram showing the configuration of the radio reception apparatus according to Embodiment 2 of the present invention. In the second embodiment of the present invention, the same components as those in the first embodiment of the present invention are designated by the same reference numerals.

As shown in FIG. 2, the second embodiment of the present invention
The radio receiving apparatus 200 according to the present embodiment is the radio receiving apparatus 100 according to Embodiment 1 of the present invention with the addition of a phase estimation unit 201.

The input terminal of the phase estimation unit 201 is connected to the output terminals of the despreading unit 103-1 and the control unit 102. The output terminal of the phase estimating unit 201 is the phase estimating unit 103.
-3 and the input terminal of the synchronous detection unit 103-4. The phase estimation unit 201 calculates the phase estimation value by averaging one or more symbols of CPICH in the despread signal from the despreading unit 103-1 and gives it to the phase estimation unit 103-3 and the coherent detection unit 103-4. .

In the second embodiment of the present invention, at the time of transmission diversity (STTD), the operation is performed as follows in consideration of other antennas.

R of PICH from RAKE combiner 104
The signal after AKE combining is used for STTD decoding (α
₀₀ ²+ Α₀₁ ²+ Α_Ten ²+ Α₁₁ ²＋ 、 ・ ・ ・ 、 ＋ α_N-10 ²+
α_N-11 ²) S _aS_cThis squared value is (α₀₀ ²+ Α
₀₁ ²+ Α_Ten ²+ Α₁₁ ²＋ 、 ・ ・ ・ 、 ＋ α_N-10 ²+ Α_N-11 ²)²S_a ²
S_c ²Becomes This is the output of the square calculation unit 107.

On the other hand, the sum of squares of the phase estimation value of CPICH of each finger 103 and each antenna is α ₀₀ ² + α ₀₁ ² + α
₁₀ ² + α ₁₁ ² +, ..., + α _N-10 ² + α _N-11 ² ) S _c ² , and the squared value is (α ₀₀ ² + α ₀₁ ² + α ₁₀ ² + α ₁₁ ² +,
, + Α _N-10 ² + α _N-11 ² ) ² _Sc ⁴ . This is the output of the square calculation unit 106. The ratio calculator 108 calculates the following (formula 3).

[0061]

[Equation 3] The value represented by this (Equation 3) is the same value as when the powers of the PICH and CPICH are being compared.

As described above, according to the second embodiment, RA
It is possible to measure the power ratio of PICH and CPICH without compensating for the KE weight, and it is possible to reduce the amount of processing calculation by eliminating the need for division.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a block diagram showing the configuration of the radio reception apparatus according to Embodiment 3 of the present invention. In the third embodiment of the present invention, the same components as those of the first embodiment of the present invention are designated by the same reference numerals.

As shown in FIG. 3, the third embodiment of the present invention.
The radio receiving apparatus 300 according to the second embodiment is different from the radio receiving apparatus 100 according to the first embodiment of the present invention in that the square calculating unit 106,
107 is deleted and a power calculation unit 301 is added.

The input terminal of the power calculating section 301 is connected to the output terminals of the phase estimating section 103-3 and the RAKE combining section 104. The output terminal of the power calculation unit 301 is connected to the input terminal of the ratio calculation unit 108. The input terminal of the ratio calculation unit 108 is connected to the output terminal of the sum of squares calculation unit 105.

Next, the details of the processing of the power calculation section 301 will be described.

The RAKE combined signal from the RAKE combining unit 104 is obtained by calculating a multiplication value of the despread signal from each finger 103 and the complex conjugate number of the phase estimation value, and adding these multiplication values. Therefore, the RAKE combined signal d
_rake (m, n) is represented by the following (formula 4).

[0068]

[Equation 4] Here, d _despread (1, m, n) represents a despread signal, l represents a finger number, m represents a slot number, n represents a symbol number, N _L represents the total number of fingers, and * Represents the complex conjugate number of the phase estimate. The above (formula 4) means that the despread signal is multiplied by the RAKE weight.

Therefore, the power calculation section 301 determines that the RAK
The E-combined signal is subjected to the processing shown in (Equation 5) below.

[0070]

[Equation 5] As a result, RAKE weight compensation can be performed, and PI
The received signal power of CH can be calculated.

As described above, according to the third embodiment of the present invention, RAKE weight compensation with a reduced processing amount is performed, and PI
Since the reception power ratio between CH and CPICH can be measured, the amount of calculation processing can be reduced.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to the drawings. The fourth embodiment of the present invention has the same components as the first embodiment of the present invention. FIG. 4 and FIG. 5 are diagrams for explaining CPICH and PICH received signals.

PICH reception is 2-bit (1 symbol) reception, and transmission diversity (STTD).
May be working. In this case, the antenna cannot be separated and the phase estimation value cannot be obtained for the CPICH of one symbol, which has the same timing as the PICH. In the case of 1 symbol, the PIC to be received
H and STTD pair (signal encoded as a pair)
Need to receive the signal.

As shown in FIG. 4, the control section 102 controls the PIC in the range in which one symbol before and after the symbol to be demodulated is added.
Despreading unit 103-so as to despread H and CPICH
1, 103-2 are controlled. FIG. 4A shows a case where the demodulation target symbol is first and the paired symbol is second. FIG. 4B shows the case where the demodulation target symbol is behind and the paired symbol is ahead (in this case, the synchronous detection unit 103-4 outputs the latter half symbol after STTD decoding). By controlling the despreading start timing and the despreading target range in this way, it is possible to separate the CPICH antennas and perform power measurement.
The amount of calculation processing can be reduced. Further, it becomes possible to demodulate the STTD-encoded PICH.

As shown in FIG. 5, the number of reference symbols for calculating the CPICH phase estimation value may be changed.
Further, the reception quality may be estimated from the moving speed (Doppler frequency) of the mobile station, the signal-to-noise ratio, etc., and may be adaptively changed according to the reception environment. For example, when the moving speed of the mobile station is slow, the phase change or the received power fluctuation is small, so the CPI
By increasing the number of target symbols of CH, it is possible to improve the measurement accuracy of the received power of CPICH.

As described above, according to the fourth embodiment of the present invention, it is during transmission diversity (STTD), and 2
When receiving PICH of bits, CPICH of the same timing as PICH and CPICH of 1 symbol before and after it
By measuring the received power of the CPICH by separating the antennas by using, it is possible to measure the received power ratio between the PICH and the CPICH without the need to perform the RAKE weight compensation. Can be reduced.

The present invention can also be applied to a radio receiving apparatus for receiving AICH. Further, the present invention is
It can be applied to communication devices such as mobile communication devices.

[0078]

As described above, according to the present invention,
It is possible to reduce the amount of calculation processing for power comparison with CPICH in the reception processing of PICH or AICH.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a configuration of a wireless reception apparatus according to Embodiment 2 of the present invention.

FIG. 3 is a block diagram showing a configuration of a wireless reception apparatus according to Embodiment 3 of the present invention.

FIG. 4 is a diagram for explaining the operation of the wireless reception device according to the fourth embodiment of the present invention.

FIG. 5 is a diagram for explaining another operation of the wireless reception device according to the fourth embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a conventional wireless reception device.

[Explanation of symbols]

100, 200, 300 wireless receiver 101 AD converter 102 control unit 103 fingers 103-1 and 103-2 despreading unit 103-3 Phase estimation unit 103-4 Synchronous detection section 104 RAKE synthesizer 105 Square sum calculation unit 106, 107 Square calculation unit 108 Ratio calculation unit 201 Phase estimation unit 301 Power calculation unit

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Motoyasu Taguchi             3-1, Tsunashima-Higashi 4-chome, Kohoku-ku, Yokohama-shi, Kanagawa             Matsushita Communication Industry Co., Ltd. F-term (reference) 5K022 EE02 EE14 EE32

Claims (12)

[Claims] 1. A first calculation means for calculating a square value of a signal after RAKE combining of PICH or AICH, and a second value for calculating a value obtained by squaring a sum of squares of phase estimation values of CPICH of each finger. And a ratio calculation unit that calculates a ratio between the value from the first calculation unit and the value from the second calculation unit. 2. A PICH or AI at the time of transmission diversity.
RAK of PICH or AICH when receiving CH
E first calculating means for calculating a squared value of the signal after the combination,
Second calculation means for calculating a value obtained by squaring the sum of squares of the CPICH phase estimation values for each finger and each antenna; and a value from the first calculation means and a value from the second calculation means. A radio receiving apparatus comprising: a ratio calculating means for calculating a ratio. 3. A first calculating means for calculating a square value of a signal obtained by performing RAKE weight compensation on a signal after RAKE combining of PICH or AICH, and a second calculating means for calculating a power value of CPICH. And a ratio calculation means for calculating a ratio between the value from the first calculation means and the value from the second calculation means. 4. A means for measuring the received power of a CPICH using the CPICH at the same timing as the PICH and the CPICH of one symbol before and after the CPICH at the time of transmission diversity and receiving the PICH of 2 bits. A wireless reception device comprising: 5. The radio receiving apparatus according to claim 4, further comprising means for changing the number of power measurement symbols according to the moving speed or the reception quality. 6. Despreading from one symbol before the demodulation target symbol when the PICH symbol is STTD-encoded with the signal one symbol before at the time of transmission diversity and receiving the 2-bit PICH. A radio receiving apparatus comprising: a control unit for controlling to perform the above and a synchronous detection unit for outputting only the latter half symbol after STTD decoding. 7. A communication device comprising the wireless reception device according to claim 1. Description: 8. A mobile communication system comprising the wireless reception device according to claim 1. Description: 9. A first calculation step of calculating a square value of a signal after RAKE combining of PICH or AICH, and a second calculation step of calculating a value obtained by squaring a sum of squares of phase estimation values of CPICH of each finger. And a ratio calculation step of calculating a ratio between the value calculated in the first calculation step and the value calculated in the second calculation step.
A wireless reception method comprising: 10. A PICH or A for transmission diversity
RA of PICH or AICH when receiving ICH
A first calculation step of calculating a square value of the signal after KE combination; a second calculation step of calculating a value obtained by squaring a sum of squares of phase estimation values of CPICH of each finger and each antenna A radio reception method comprising: a ratio calculation step of calculating a ratio between the value calculated in the first calculation step and the value calculated in the second calculation step. 11. A first calculation step of calculating a square value of a signal obtained by performing RAKE weight compensation on a signal after RAKE combining of PICH or AICH, and a second calculation step of calculating a power value of CPICH. And a ratio calculation step of calculating a ratio between the value calculated in the first calculation step and the value calculated in the second calculation step,
A wireless reception method comprising: 12. At the time of transmission diversity, and 2
A radio receiving method, comprising: when receiving a PICH of bits, measuring the received power of the CPICH using the CPICH having the same timing as the PICH and the CPICH of one symbol before and after the CPICH.