JP2001339325A - Radio receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct channel estimation and production of a delay profile with high accuracy. SOLUTION: The radio receiver is provided with a 1st reception means that receives a common share signal sent from a communication opposite party through a channel commonly shared between its own station and other station and a reception control means that uses the common share signal to generate an element for enhancing the quality of the share signal and uses the generated element to conduct reception control for the share signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CDMA (Code D)
The present invention relates to a communication device used for digital mobile communication of an ivision multiple access (ivision multiple access) system, and more particularly to a radio receiving device that performs channel estimation and delay profile generation.

[0002]

2. Description of the Related Art Conventional CDMA digital mobile communication will be described with reference to FIGS. FIG. 5 is a schematic diagram showing an example of a state of a digital mobile communication system. FIG. 6 is a schematic diagram showing an example of channel assignment in a digital mobile communication system.

In FIG. 5, as an example, a base station 11
Are three mobile stations (that is, mobile station 12 to mobile station 14).
A state in which wireless communication is performed with the device is shown. Between the base station 11 and each of the mobile stations, the transmission data and the control signal are transmitted by a dedicated channel (DPCH: Dedicated) shown in FIG.
Physical Channel), downlink shared channel (DSCH: Downlink Shared Channel) and the like.

[0004] The DSCH is a channel for transmitting data (packets) modulated by a high-rate modulation method (for example, a modulation method such as 64QAM or 16QAM) to each mobile station in a time-division manner. It is possible to change the destination mobile station. DPCH
Is the data such as voice and the known signal (P
L) and TFCI (Transmit Format Combinatio)
n Indicator) to each mobile station.

In order to simplify the following description, D
A signal transmitted using the SCH is referred to as a “DSCH signal”, and a signal transmitted using the DPCH is referred to as a “DPCH signal”.

Each mobile station performs a reception process as described below. That is, the mobile station determines the T in the DPCH signal.
Using the FCI, the mobile station recognizes to which mobile station the DSCH signal is addressed. Further, the mobile station obtains a demodulated signal by performing a despreading process on the DSCH signal addressed to the mobile station.

However, the DCSH signal received by the mobile station includes not only propagation delay but also phase fluctuation and amplitude fluctuation (hereinafter simply referred to as “fading fluctuation”) due to fading and the like. . Therefore,
The mobile station generates a delay profile using the known signal extracted from the DPCH signal after the despreading processing, and detects the despread timing from the generated delay profile. The mobile station performs channel estimation using the extracted known signal, and detects a channel estimation value using the channel estimation value obtained by this channel estimation. Further, the mobile station performs a despreading process on the received signal in accordance with the despreading timing detected as described above to extract a DSCH signal, and extracts the DSCH using the channel estimation value detected as described above. Compensate for fading variations on the signal. Thereby, the mobile station obtains a demodulated signal with fading fluctuation reduced.

[0008]

In the above-mentioned conventional digital mobile communication, it is desired to perform channel estimation and delay profile generation with higher accuracy. That is, since the base station transmits a DSCH signal using a modulation scheme with a higher rate than the DPCH signal, the mobile station is obtained by despreading when the accuracy of channel estimation and delay profile generation is poor. Compensation for fading fluctuations with respect to the DSCH signal cannot be performed with high accuracy, and as a result, the quality of the demodulated signal cannot be kept good.

For example, when QPSK modulation is used by the base station, the mobile station can correctly demodulate the received signal by correctly detecting only the phase of the received signal. If modulation is used,
The mobile station cannot accurately demodulate the received signal unless it correctly detects not only the phase but also the amplitude of the received signal.

[0010] For these reasons, in the mobile station,
It is desired to improve the accuracy of channel estimation and delay profile generation.

The present invention has been made in view of the above points, and has as its object to provide a radio receiving apparatus that performs channel estimation and delay profile generation with high accuracy.

[0012]

According to the present invention, there is provided a radio receiving apparatus comprising: first receiving means for receiving a shared signal transmitted by a communication partner via a channel shared between the own station and another station; An element for generating an element for improving the quality of the shared signal using the shared signal and receiving control means for performing reception control on the shared signal using the generated element is adopted.

According to this configuration, it is possible to perform reception control (that is, for example, perform channel estimation and delay profile generation with high accuracy) on the shared signal, and thus extract a highly accurate demodulated signal.

The radio receiving apparatus of the present invention employs a configuration in which the reception control means generates a channel estimation value as an element for improving the quality of a shared signal.

According to this configuration, a highly accurate demodulated signal can be extracted by performing channel estimation with high accuracy.

According to the radio receiving apparatus of the present invention, the reception control means generates a first known signal by tentatively determining the shared signal subjected to the despreading processing. Using the first known signal, a first
The present invention employs a configuration including a first channel estimation value generation unit that generates a channel estimation value, and a compensation unit that performs compensation processing on a despread-processed shared signal using the first channel estimation value.

The radio receiving apparatus according to the present invention comprises a second receiving means for receiving a unique signal transmitted by a communication partner through a channel unique to the own station, and a second receiving means using a known signal included in the unique signal. A second channel estimating means for generating a channel estimation value, wherein the known signal generation means performs a compensation process using the second channel estimation value on the despread-processed shared signal before the provisional determination. Then, the first channel estimation value generating means adopts a configuration in which a value obtained by combining the first channel estimation value and the second channel estimation value is used as the first channel estimation value.

According to these configurations, only the shared signal transmitted to the own station or the DS transmitted to another station is transmitted.
By performing channel estimation also using the CH signal,
A highly accurate demodulated signal can be extracted using a normal individual signal or a shared signal.

[0019] In the radio receiving apparatus according to the present invention, the reception control means includes reliability detection means for detecting the reliability of the despread shared signal, and only when the reliability exceeds a predetermined threshold, the reception control means detects the reliability. The signal generation means performs a compensation process using the second channel estimation value on the despread shared signal before the tentative determination, and the first channel estimation value generation means
A configuration is adopted in which a value obtained by combining the channel estimation value and the second channel estimation value is used as the first channel estimation value.

According to this configuration, since only the highly reliable shared signal among the received shared signals is used for channel estimation, even when the reception power of the shared signal may be reduced due to the effect of fading, A highly accurate demodulated signal can be extracted.

[0021] The radio reception apparatus of the present invention employs a configuration in which the reception control means generates a delay profile as an element for improving the quality of a shared signal.

According to this configuration, since the delay profile can be generated with high accuracy, a highly accurate demodulated signal can be extracted.

[0023] In the radio receiving apparatus according to the present invention, the reception control means may include a first delay profile generating means for generating a first delay profile using the despread shared signal, and the first delay profile using the first delay profile. Timing detection means for detecting despread timing in despreading processing;
Is adopted.

[0024] The radio receiving apparatus according to the present invention comprises: a second receiving means for receiving a unique signal transmitted by a communication partner through a channel unique to the own station; Extracting means for extracting a known signal included in the unique signal; second delay profile generating means for generating a second delay profile using the known signal;
And the first delay profile generating means adopts a configuration in which a combination of the first delay profile and the second delay profile is used as the first delay profile.

According to these configurations, only the shared signal transmitted to the own station or the DS transmitted to another station is transmitted.
By generating the delay profile (detecting the despreading timing) also using the CH signal, a highly accurate demodulated signal can be extracted using a normal individual signal or a shared signal.

[0026] In the radio receiving apparatus according to the present invention, the reception control means includes reliability detecting means for detecting the reliability of the despread shared signal, and only when the reliability exceeds a predetermined threshold value, The first delay profile generation means adopts a configuration in which a combination of the first delay profile and the second delay profile is used as the first delay profile.

According to this configuration, since only the highly reliable shared signal among the received shared signals is used for generating the delay profile, even when the reception power of the shared signal may be reduced due to the effect of fading. , A highly accurate demodulated signal can be extracted.

The radio receiving apparatus of the present invention employs a configuration in which the reliability detecting means detects the reliability using the power of the despread shared signal.

The radio receiving apparatus according to the present invention employs a configuration in which the reliability detecting means detects the reliability using the modulation scheme used for the shared signal.

According to these configurations, since the reliability of the shared signal can be reliably detected, a demodulated signal with higher accuracy can be extracted.

A communication terminal device according to the present invention employs a configuration provided with any one of the above-mentioned radio receiving devices.

The base station apparatus according to the present invention employs a configuration for performing wireless communication with a communication terminal apparatus having any one of the above-mentioned wireless receiving apparatuses.

According to these configurations, good radio communication can be performed by mounting a radio receiving device that performs channel estimation or delay profile generation with high accuracy.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The gist of the present invention is to improve the quality of a shared signal by using a shared signal transmitted by a communication partner through a channel shared between the own station and another station. An element is generated, and reception control for the shared signal is performed using the generated element. In particular,
The first point is that a channel estimation value is generated using a shared signal transmitted by a communication partner, and compensation processing for the shared signal is performed using the generated channel estimation value. The second point is that a delay profile is generated using a shared signal transmitted by a communication partner, and despreading processing is performed on the shared signal according to a despread timing detected from the generated delay profile.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Here, as an example, in a mobile communication system as shown in FIG. 5, a mobile station device provided with a radio receiving device according to the following embodiment is used as a base station device in accordance with channel assignment as shown in FIG. A case in which wireless communication is performed with the network will be described.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a mobile station apparatus provided with a radio receiving apparatus according to Embodiment 1 of the present invention. In FIG. 1, DPCH despreading section 102 includes delay profile combining section 115 described later.
A DPCH signal is extracted by performing a despreading process on a signal (received signal) received via the antenna 101 using a spreading code assigned to the mobile station apparatus in accordance with the despreading timing from. .

The PL section extraction section 103 outputs the extracted DPC
A known signal (“PL” in FIG. 6) is extracted from the H signal.
The DATA unit extraction unit 104 extracts data (“Data” in FIG. 6) from the extracted DPCH signal. TFC
The I-part extracting section 105 calculates the TF from the extracted DPCH signal.
The CI (“TFCI” in FIG. 6) is extracted.

[0038] DSCH despreading section 116 subjects the received signal from antenna 101 to a DSC in accordance with the despreading timing from delay profile combining section 115 described later.
A DSCH signal is extracted by performing a despreading process using a spreading code assigned to H.

First channel estimating section 106 performs channel estimation using the extracted known signal and known pilot pattern. Multiplying section 107 multiplies a channel estimation value from channel estimation value combining section 110 described later by the extracted data. Multiplying section 108 calculates the channel estimation value from channel estimation value combining section 110 and the extracted TFCI
And multiply by The multiplication unit 109 calculates the extracted DSC
The H signal is multiplied by the channel estimation value from the channel estimation value combining unit 110.

The tentative judgment section 111 makes a tentative judgment on the multiplication result in the multiplication section 109. Second channel estimation unit 1
12 performs channel estimation using the extracted DSCH signal and the provisional determination result. Channel estimation value combining section 110
Synthesizes the channel estimation value from the first channel estimation unit 106 and the channel estimation value from the second channel estimation unit 112.

TFCI demodulation section 117 performs demodulation processing on the multiplication result in multiplication section 108. Switch 11
8 outputs the multiplication result in the multiplication section 109 as the DSCH demodulation result based on the demodulation result in the TFCI demodulation section 117.

The first delay profile generation section 113
A delay profile is generated using the known signal extracted by the L part extraction unit 103. Second delay profile generating section 114 generates a delay profile using the DSCH signal extracted by DSCH despreading section 116. The delay profile synthesizing unit 115 synthesizes the delay profile generated by the first delay profile generating unit 113 and the delay profile generated by the second delay profile generating unit 114. Further, delay profile combining section 115 detects the despread timing using the combined delay profile and sends the detected despread timing to DPCH despreading section 102 and DSCH despreading section 116 described above.

Next, the operation of the mobile station apparatus having the above configuration will be described. Here, as an example, a case where a DSCH signal for one frame is demodulated will be described.

[0044] The signal transmitted by the base station apparatus is received by antenna 101. The received signal from antenna 101 is sent to DPCH despreading section 102 and DSCH despreading section 116.

DSCH despreading section 116 performs a despreading process on the received signal from antenna 101 using a spreading code assigned to the DSCH. Thereby, a DSCH signal is extracted. This DSC
The despreading process in H despreading section 116 is performed according to the despreading timing from delay profile combining section 115. The extracted DSCH signal is sent to multiplication section 109.

[0046] In DPCH despreading section 102, the received signal from antenna 101 is subjected to despreading processing using a spreading code assigned to the mobile station apparatus.
Thereby, a DPCH signal is extracted. Note that this D
The despreading process in PCH despreading section 102 is performed according to the despreading timing from delay profile combining section 115. The extracted DPCH signal is output to the PL extraction unit 1
03, which is sent to the DATA section extraction section 104 and the TFCI section extraction section 105.

Data section extraction section 104 extracts a data portion from the extracted DPCH signal,
Sent to The TFCI part extraction section 105 extracts a TFCI part from the extracted DPCH signal and
8

In the PL section extraction section 103, the extracted DP
A known signal is extracted from the CH signal and sent to first channel estimation section 106. In first channel estimation section 106, channel estimation is performed using the extracted known signal and known pilot pattern. The channel estimation result obtained by first channel estimation section 106 is sent to channel estimation value combining section 110.

In channel estimation value combining section 110, the channel estimation value from first channel estimation section 106 and the channel estimation value from second channel estimation section 112 are combined. At this time, since the channel estimation value has not been sent from the second channel estimation unit 112, the channel estimation value from the first channel estimation unit 106 is used as the combined channel estimation value. Thereafter, the complex conjugate of the combined channel estimation value is sent from channel estimation value combining section 110 to multiplying section 109.

In the multiplier 109, the DSCH despreader 11
6 and the channel estimation value combining section 110
And the complex conjugate from. As a result, a DSCH signal in which fading fluctuation is compensated is obtained. Here, the fading fluctuation compensated here means the channel estimation value from first channel estimation section 106 (that is, D
(A channel estimation value using only a known signal in the PCH signal).

The tentative decision section 111 makes a tentative decision on the DSCH signal whose fading fluctuation has been compensated. The DSCH signal after the tentative determination is sent to second channel estimation section 112.

The second channel estimating section 112 performs channel estimation using the DSCH signal after the tentative determination from the tentative determining section 111 and the DSCH signal from the DSCH despreading section 116. Here, the DSCH signal after the tentative determination is used as a known signal. Second channel estimation section 112
Are sent to the channel estimation value combining unit 110.

At present, the channel estimation value combining section 110
, The above-described channel estimation value from the first channel estimation unit 106 and the channel estimation value from the second channel estimation unit 112 are input. Therefore, channel estimation value combining section 110 combines the two channel estimation values. Thereafter, the channel estimation value combining unit 110
07 to the multiplication section 109, the complex conjugate of the combined channel estimation value is output.

In the multiplication section 107, the DATA section extraction section 10
4 is multiplied by the complex conjugate from the channel estimation value combining unit 110. As a result, data in which fading fluctuation is compensated is obtained. This data is output as a DPCH demodulation result. Multiplication unit 108
In, multiplication of the TFCI from the TFCI section extraction section 105 and the complex conjugate from the channel estimation value synthesis section 110 is performed. Thereby, T in which fading fluctuation is compensated for
FCI is obtained. The obtained TFCI is sent to TFCI demodulation section 117.

In TFCI demodulation section 117, multiplication section 108
Are demodulated, and based on the demodulation result,
It is determined whether the DSCH signal has been transmitted to the own station. Further, in the TFCI demodulation unit 117, D
Only when it is determined that the SCH signal is transmitted to its own station, the DSCH signal from
A control signal to output as an SCH demodulation result is generated. The control signal is sent to the switch 118 and sent to the multiplier 109 via a path (not shown).

That is, when it is determined that the DSCH signal is transmitted to its own station, the multiplication unit 109
Then, the DSCH signal from the DSCH despreading unit 116,
And the complex conjugate from the channel estimation value combining unit 110. As a result, D in which fading fluctuation is compensated for
An SCH signal is obtained. The DSCH signal in which the fading fluctuation has been compensated is output as a DSCH demodulation result via the switch 118.

At this time, the fading fluctuation compensated by the multipliers 107, 108 and 109 is as follows.
This corresponds to the value estimated by the channel estimation value from channel estimation value combining section 110 (that is, the channel estimation value based on the known signal in the DPCH signal and the DSCH signal).

On the other hand, in parallel with the above-described channel estimation,
DPCH despreading section 102 and DSCH despreading section 116
Are detected as described below. First, the known signal extracted by the PL unit extraction unit 103 is sent to the first delay profile generation unit 113. DSCH extracted by DSCH despreading section 116
The signal is sent to second delay profile generating section 114.

In the first delay profile generation section 113,
A delay profile is generated using the known signal.
The generated delay profile is sent to delay profile combining section 115. Second delay profile generator 11
In 4, the delay profile is generated using the DSCH signal. The generated delay profile is sent to delay profile combining section 115.

In the delay profile synthesizing unit 115, the first
The delay profiles generated by the delay profile generator 113 and the second delay profile generator 114 are combined. Further, in the combined delay profile, the peak having the maximum size is detected as the despread timing. The detected despreading timing is sent to DPCH despreading section 102 and DSCH despreading section 116 described above.

Next, the effects of the mobile station apparatus having the above configuration will be described focusing on channel estimation and delay profile generation. First, an effect in channel estimation will be described. In the conventional method, as shown in FIG. 6, channel estimation is performed using a known signal inserted into the DPCH signal of one frame, whereas
In the present embodiment, channel estimation is performed using a DSCH signal in addition to channel estimation similar to the conventional method. That is, in the present embodiment, the number of data used for channel estimation is significantly increased as compared with the conventional method. As a result, highly accurate channel estimation can be performed.

Further, when the period of the fading fluctuation is shorter than the period corresponding to one frame, the accuracy of channel estimation is deteriorated in the conventional method, but in the present embodiment,
Since channel estimation is performed using not only the known signal inserted into the DPCH signal but also the DSCH signal for one frame, the accuracy of channel estimation can be kept good.

Next, the effect of the delay profile generation will be described. In the conventional method, as shown in FIG.
While the delay profile is generated using the known signal inserted in the DPCH signal of one frame, in the present embodiment, in addition to the delay profile generation similar to the conventional method, the DSCH signal is further generated. Is used to generate a delay profile. That is, in the present embodiment,
Compared with the conventional method, the number of data used for generating the delay profile is greatly increased. As a result, detection of the despread timing can be performed with high accuracy.

As described above, according to the present embodiment, the channel estimation and the generation of the delay profile (using the DSCH signal transmitted to the own station as well as the DSCH signal transmitted to the other station) are performed. Detection of despread timing)
, A highly accurate demodulated signal can be extracted using not only a normal DPCH signal but also a DSCH signal transmitted using a high-speed modulation scheme.

In this embodiment, as an example for obtaining the maximum effect, a case has been described in which channel estimation and delay profile generation are performed in parallel using a known signal and a DSCH signal in a DPCH signal. However, even when one of the channel estimation and the delay profile generation alone is applied,
It goes without saying that a demodulated signal with higher precision can be extracted as compared with the conventional method.

Also, in the present embodiment, the base station apparatus uses the DPCH to transmit data (voice, etc.) and various known signals to different mobile station apparatuses through different channels, respectively. The case has been described where the apparatus uses the DSCH to transmit data (packets and the like) to each mobile station apparatus through the same channel. However, the present invention is also applicable to communication in which the base station device communicates with each mobile station device using a unique channel, and the base station device performs communication using the same channel as each mobile station device. Applicable.

(Embodiment 2) In the present embodiment, a case will be described in Embodiment 1 where only a signal of which received power exceeds a predetermined threshold among received DSCH signals is used for channel estimation and delay profile generation. explain.

In the first embodiment, all received DSCH signals are used for channel estimation and delay profile generation. However, received DSCH signals include signals whose reception power is reduced due to the effects of fading. There is a high possibility that the provisional determination result of such a DSCH signal having reduced reception power includes an error. Such a DSCH
When the channel estimation and the delay profile generation are performed using the signal, the accuracy of the demodulated signal to be extracted deteriorates.

Therefore, in the present embodiment, only signals of which received power exceeds a predetermined threshold among received DSCH signals are used for channel estimation and delay profile generation. Hereinafter, the radio receiving apparatus according to the present embodiment will be described with reference to FIG.

FIG. 2 is a block diagram showing a configuration of a mobile station apparatus provided with a radio receiving apparatus according to Embodiment 2 of the present invention. In addition, about the same structure as Embodiment 1 (FIG. 1) in FIG. 2, the same code | symbol as the thing in FIG. 1 is attached | subjected, and detailed description is abbreviate | omitted.

In FIG. 2, the power calculation unit 201
The reception power (power) of the DSCH signal from the CH despreading unit 116 is calculated, and the calculated reception power is compared with a predetermined threshold. The power calculation unit 201 controls a switch 202 and a switch 203 described later based on the result of the comparison. That is, when the calculated reception power is larger than the threshold, power calculation section 201 sets second channel estimation section 1
The channel estimation value from the channel estimation value
The switch 202 is controlled so that the delay profile is output to 0, and the switch 203 is controlled so that the delay profile from the second delay profile generation unit 114 is output to the delay profile synthesis unit 115. Conversely, the power calculation unit 20
When the calculated reception power is equal to or less than the threshold value, the switch 20 prevents the channel estimation value from the second channel estimation unit 112 from being output to the channel estimation value combining unit 110.
2 and a second delay profile generator 1
The switch 203 is controlled not to output the delay profile from 14 to the delay profile synthesizing unit 115.

The switches 202 and 203 are
The output of the channel estimation value and the output of the delay profile are switched based on the control by the power calculation unit 201 described above.

As described above, according to the present embodiment, only the signal of which received power exceeds a predetermined threshold value among the received DSCH signals is used for channel estimation and delay profile generation, so that the effect of fading is reduced. DS
Even when there is a possibility that the reception power of the CH may be reduced, a highly accurate demodulated signal can be extracted.

(Embodiment 3) In the present embodiment, in Embodiment 1, the DSCH signal of the received DSCH signal, which uses a modulation scheme with a smaller modulation level, is used.
A case will be described where only a DSCH signal that is an SCH signal and whose reception power exceeds a predetermined threshold is used for channel estimation and delay profile generation.

Generally, a base station apparatus transmits data at a high rate using a QPSK method (see FIG. 4A), a 16QAM method (see FIG. 4B), a 64QAM method (see FIG. 4C), or the like. Is transmitted as a DSCH signal. Under the condition that the mobile station apparatus receives a DSCH signal with the same average received power, for a DSCH signal using the 16QAM scheme or the 64QAM scheme, an accurate tentative decision cannot be made unless amplitude information is accurately detected. On the other hand, QPS
For a DSCH signal using the K method, an accurate tentative decision can be made by accurately detecting only the phase information.

Therefore, in the present embodiment, in order to perform channel estimation and delay profile generation with higher accuracy, a DSCH signal using a modulation scheme with a smaller modulation multilevel number is used, and reception power is lower. Only DSCH signals exceeding a predetermined threshold are used for channel estimation and delay profile generation. As a result, channel estimation and delay profile generation can be performed with high accuracy.

Hereinafter, the radio receiving apparatus according to the present embodiment will be described with reference to FIG. FIG. 3 is a block diagram illustrating a configuration of a mobile station device including the wireless reception device according to the third embodiment of the present invention. In addition, about the same structure as Embodiment 1 (FIG. 1) in FIG. 3, the same code | symbol as the thing in FIG. 1 is attached | subjected, and detailed description can be abbreviate | omitted.

In FIG. 3, power calculating section 201 receives the DS signal from DSCH despreading section 116 in the same manner as in the second embodiment.
The reception power of the CH signal is calculated, and the calculated reception power is compared with a predetermined threshold. The power calculation unit 201 outputs the comparison result to the determination unit 302. Modulation method detection section 301
Detects the modulation scheme used for the DSCH signal from DSCH despreading section 116 and determines the detection result
Output to

[0086] Determination section 302 controls switches 202 and 203 based on the comparison result from power calculation section 201 and the detection result from modulation scheme detection section 301. That is, the determination unit 302 determines that the reception power exceeds a predetermined threshold value and the modulation scheme is highly reliable (that is, the modulation scheme is a modulation scheme having a smaller number of modulation levels (for example, QPSK).
The switch 202 and the switch 203 are controlled so that only the DSCH signal using the method)) is used for channel estimation and delay profile generation. In other words, the determination unit 302 determines the D
The switch 202 is used so that channel estimation and delay profile generation can be performed using only the SCH signal.
And the switch 203. Specific switch 2
The operations of the switch 02 and the switch 203 are the same as those described in the second embodiment.

As described above, according to the present embodiment, among the received DSCH signals, the DSCH signal using the modulation scheme having a smaller modulation level is used, and the reception power has a predetermined threshold value. By using only the exceeded DSCH signal for channel estimation and delay profile generation,
Further, a highly accurate demodulated signal can be extracted.

In the present embodiment, the case where the modulation scheme is detected using the extracted DSCH signal has been described as an example. However, when information for notifying the modulation scheme is included in the TFCI, the TFCI It is possible to detect the modulation method using the demodulation result.

[0082]

As described above, according to the present invention,
Generates an element for improving the quality of this shared signal using a shared signal transmitted by a communication partner via a channel shared between the own station and another station, and uses the generated element to generate an Since the reception control is performed on the shared signal, it is possible to provide a radio receiving apparatus that performs channel estimation and delay profile generation with high accuracy.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a mobile station device including a wireless reception device according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a mobile station device including a wireless reception device according to a second embodiment of the present invention.

FIG. 3 is a block diagram illustrating a configuration of a mobile station device including a wireless reception device according to a third embodiment of the present invention.

4A is a schematic diagram showing an arrangement of signal points in a QPSK modulation system; FIG. 4B is a schematic diagram showing an arrangement of signal points in a 16QAM modulation system; FIG. 4C is a schematic diagram showing an arrangement of signal points in a 64QAM modulation system;

FIG. 5 is a schematic diagram showing an example of a state of a digital mobile communication system.

FIG. 6 is a schematic diagram showing an example of channel assignment in a digital mobile communication system.

[Explanation of symbols]

 Reference Signs List 101 antenna 102 DPCH despreading unit 103 PL unit extracting unit 106 first channel estimating unit 109 multiplying unit 116 DSCH despreading unit 111 provisional determining unit 112 second channel estimating unit 110 channel estimated value combining unit 113 first delay profile generating unit 114 Second delay profile generation section 115 Delay profile synthesis section 201 Power calculation section 202, 203 Switch 301 Modulation scheme detection section 302 Determination section

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor: Toyoki Kami 4-3-1 Tsunashimahigashi, Kohoku-ku, Yokohama-shi, Kanagawa F-term (reference) in Matsushita Communication Industrial Co., Ltd. 5K022 EE01 EE31 5K067 AA02 BB02 CC10 DD34 EE02 EE10 EE61 JJ11

Claims (13)

[Claims] 1. A first receiving means for receiving a shared signal transmitted by a communication partner through a channel shared between the own station and another station, and using the shared signal to determine the quality of the shared signal. And a reception control unit for generating an element for improvement and performing reception control on the shared signal using the generated element. 2. The radio reception apparatus according to claim 1, wherein the reception control means generates a channel estimation value as an element for improving the quality of the shared signal. 3. The reception control means includes: a known signal generating means for generating a first known signal by temporarily determining a despread-processed shared signal; and a despreading shared signal and the first known signal. A first channel estimation value generating unit that generates a first channel estimation value using the first channel estimation value; and a compensation unit that performs compensation processing on the despread-processed shared signal using the first channel estimation value. The wireless receiving device according to claim 2, wherein: 4. A second receiving means for receiving a unique signal transmitted by a communication partner via a channel unique to the own station, and generating a second channel estimation value using a known signal included in the unique signal. A second channel estimation unit, wherein the known signal generation unit performs a compensation process using the second channel estimation value on the despread-processed shared signal before the tentative determination, and performs a first channel estimation process. 4. The radio receiving apparatus according to claim 3, wherein the value generation unit sets a value obtained by combining the first channel estimation value and the second channel estimation value as the first channel estimation value. 5. The reception control means includes reliability detection means for detecting the reliability of the despread shared signal, and only when the reliability exceeds a predetermined threshold, the known signal generation means performs the reverse detection. The spread signal is subjected to a compensation process using the second channel estimation value before the tentative determination, and the first channel estimation value generating means is configured to generate the first channel estimation value and the second channel estimation value.
The radio receiving apparatus according to claim 4, wherein a value obtained by combining the channel estimation value and the channel estimation value is a first channel estimation value. 6. The radio reception apparatus according to claim 1, wherein the reception control means generates a delay profile as an element for improving the quality of the shared signal. 7. A reception control unit comprising: a first delay profile generation unit configured to generate a first delay profile using the shared signal subjected to the despreading process; and a despreading process in the despreading process using the first delay profile. The radio receiving apparatus according to claim 6, further comprising: timing detecting means for detecting timing. 8. A second receiving means for receiving a unique signal transmitted by a communication partner through a channel unique to the own station, and a despreading process performed on the unique signal to include the unique signal included in the unique signal. Extracting means for extracting a known signal; and a second means for generating a second delay profile using the known signal.
Delay profile generation means, wherein the first delay profile generation means includes a first delay profile and the second delay profile.
The wireless reception device according to claim 7, wherein a combination of the delay profile and the delay profile is a first delay profile. 9. The reception control means includes a reliability detection means for detecting the reliability of the despread shared signal, and the first delay profile generation means only when the reliability exceeds a predetermined threshold value. 9. The radio receiving apparatus according to claim 8, wherein a combination of the first delay profile and the second delay profile is a first delay profile. 10. The radio receiving apparatus according to claim 5, wherein the reliability detecting means detects the reliability using the power of the despread shared signal. 11. The radio receiving apparatus according to claim 10, wherein the reliability detecting means detects the reliability by using a modulation scheme used for the shared signal. 12. A communication terminal device comprising the wireless receiving device according to any one of claims 1 to 11. 13. A base station apparatus for performing wireless communication with the communication terminal apparatus according to claim 12.