JP2005341277A - Radio communication terminal device and method for correcting transmission line estimate of radio communication terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a radio communication terminal device which is capable of suppressing the deterioration of demodulation performance in an uplink out-of-synchronism state. <P>SOLUTION: A radio communication terminal device includes a feedback information generating section 5 for generating feedback information from a transmission line estimate value; an antenna weight estimating section 7 for generating the result of antenna weight estimation by estimating an antenna weight of a radio base station from a received signal; an uplink synchronous state determination section 8 for determining whether the uplink synchronous state of a transmission line is an out-of-synchronism state or a synchronized state from the feedback information and the result of antenna weight estimation; a phase correction amount determining section 9 for determining a phase rotation amount as a correction amount of the transmission line estimate value from the feedback information, the result of antenna weight estimation and the uplink synchronous state; and a transmission line estimate correcting section 10 for correcting the transmission estimate value in accordance with the phase rotation amount. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the present invention, a base station transmits a signal to a radio communication terminal apparatus via a plurality of antennas, and controls the phase of a signal transmitted from each antenna of the base station based on a signal received by the radio communication terminal apparatus BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication terminal device of a wireless communication system and a method of correcting a transmission channel estimation value of the wireless communication terminal device, and in particular, a W-CDMA (Wideband-Code Division Multiple Access) system to which closed-loop transmission diversity mode 1 is applied. It is related with the improvement which aims at the reception performance improvement of the radio | wireless communications system which employ | adopts.

  When closed-loop transmission diversity mode 1 is applied to a W-CDMA system, the radio base station uses a common pilot channel CPICH (Common Pilot Channel, hereinafter referred to as CPICH) from two antennas (antennas # 1 and # 2). ) And a dedicated traffic channel DPCH (Dedicated Physical Channel: hereinafter referred to as DPCH). CPICH is transmitted with a modulation pattern orthogonal to each antenna. In DPCH, data and pilot are transmitted in a time multiplexed manner, but data is transmitted in the same pattern at each antenna, and pilot is transmitted in an orthogonal pattern from each antenna. That is, in the mobile station, the pilots included in CPICH and DPCH can be separated for each antenna. In addition, the phase rotation of π / 4, 3π / 4, -3π / 4, and −π / 4 [rad] is performed on the DPCH transmitted from the antenna # 2 based on the feedback information transmitted from the mobile station. Multiplication of antenna weights is performed.

  In the radio communication terminal apparatus, when DPCH is demodulated using the channel estimation value generated from CPICH, the antenna weight used for antenna # 2 of the radio base station is estimated, and transmission is performed based on the antenna weight. It is necessary to correct the estimated road value. If the feedback information transmitted from the wireless communication terminal apparatus is received by the wireless base station without error and the expected antenna weight is set, the wireless communication terminal apparatus determines the antenna weight of the wireless base station from the transmitted feedback information. Then, it may be used for correcting the channel estimation value. However, since there are many errors in receiving feedback information in the radio base station, the antenna weight is not necessarily set as expected. Therefore, when the transmission path estimation value is corrected with the feedback information transmitted by the wireless communication terminal apparatus, and this value is used for demodulation, the reception quality is deteriorated. Therefore, it is necessary for the radio communication terminal apparatus to estimate the antenna weight from the received signal.

  On the other hand, for example, Embodiment 1 (FIG. 1) of Patent Document 1 proposes a wireless communication terminal apparatus that estimates an antenna weight from a received signal and uses it to correct a transmission path estimation value. This radio communication terminal apparatus is a radio communication terminal of a radio communication system to which closed-loop transmission diversity is applied, and in a demodulation operation, in order to use CPICH as a channel estimation value, a radio base station The antenna weight is estimated and the channel estimation value is corrected.

  As a result, the demodulation performance degradation of the radio communication terminal apparatus due to the reception error of the feedback information in the radio base station is reduced. However, when the quality of the received signal is poor, the antenna weight of the radio base station cannot always be estimated correctly, and when it is incorrectly estimated, the demodulation performance deteriorates.

  On the other hand, an example of a method (Simplified Beam Former Verification) for detecting when the antenna weight is erroneously set in the base station on the wireless communication terminal device side is proposed in Non-Patent Document 1, for example. . This Non-Patent Document 1 describes a method of using a received signal and transmitted feedback information for antenna weight estimation. In this method, it is proposed that the antenna weight estimated from the received signal is used when the quality of the received signal is good, and the transmitted feedback information is used when the quality of the received signal is bad.

JP 2002-344354 A (5th and 6th pages, FIG. 1) 3GPP RAN TS25.214 V3.12.0 2003-3

  However, in the wireless communication terminal devices described in Patent Document 1 and Non-Patent Document 1, downlink synchronization is maintained, but the case where uplink synchronization is lost is not considered. When uplink synchronization is lost, the transmission feedback information does not reach the radio base station, and the antenna weight set for the antenna in the radio base station is indefinite for the radio communication terminal apparatus. At that time, when demodulating using the transmitted feedback information, there is an unsolved problem that the demodulation performance deteriorates.

  The present invention has been made in order to solve the above-described problems. The demodulation performance is determined by determining the uplink synchronization state and determining the correction amount of the channel estimation value based on the determined synchronization state. It is an object of the present invention to provide a radio communication terminal apparatus and a method for correcting a transmission path estimation value of the radio communication terminal apparatus that can improve the demodulation performance degradation particularly in an uplink out-of-synchronization state.

  A radio communication terminal apparatus according to the present invention forms a communication system together with a radio base station having a plurality of antennas, receives a radio signal transmitted through the antenna, and transmits feedback information based on the received signal to the radio base station In addition, in a wireless communication terminal device that estimates a transmission path estimation value from a reception signal and detects (demodulates) using the transmission path estimation value, a feedback information generation unit that generates feedback information from the transmission path estimation value, and a reception signal An antenna weight estimation unit that estimates the antenna weight of the radio base station from the base station and generates an antenna weight estimation result, and whether the uplink synchronization state of the transmission path is out of synchronization state or synchronization establishment state based on the feedback information and the antenna weight estimation result An uplink synchronization state determination unit that determines whether the A phase correction amount determination unit that determines a phase rotation amount as a correction amount of the transmission channel estimation value from the tenaweight estimation result and the uplink synchronization state; and a transmission channel estimation value correction unit that corrects the transmission channel estimation value according to the phase rotation amount. I have.

  In the wireless communication terminal device according to the present invention, the uplink synchronization state determination unit determines whether the uplink synchronization state of the transmission path is an out-of-synchronization state or a synchronization establishment state, and based on the synchronization state, The determination method of the phase rotation amount as the correction amount of the transmission path estimation value is selected as an appropriate method. Thereby, the amount of phase rotation is made appropriate as the correction amount. As a result, it is possible to reduce the demodulation performance degradation in the uplink out-of-synchronization state.

  Embodiments of a wireless communication terminal apparatus and a method of correcting a transmission path estimation value of the wireless communication terminal apparatus according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
1 is a block diagram showing a configuration of a radio communication terminal apparatus according to Embodiment 1 of the present invention. In FIG. 1, a radio communication terminal apparatus includes a receiving unit 1, a DPCH despreading unit 2, a CPICH despreading unit 3, a transmission path estimation unit 4, a feedback information generation unit 5, a feedback information storage unit 6, And an antenna weight estimation unit 7. The radio communication terminal apparatus further includes an uplink synchronization state determination unit 8, a phase correction amount determination unit 9, a transmission path estimation value correction unit 10, a detection unit 11, a mixing unit 12, and a transmission unit 13. have.

  The receiving unit 1 inputs a radio (RF) signal from a radio base station received by a receiving antenna (not shown) as a received signal, and converts the received signal into a baseband signal. The DPCH despreading unit 2 despreads DPCH based on this baseband signal to obtain a DPCH despread signal. The CPICH despreading unit 3 despreads CPICH from the baseband signal to obtain a CPICH despread signal.

  The transmission path estimation unit 4 estimates a transmission path estimation value for each of the two antennas (antennas # 1 and # 2) of the radio base station from the CPICH despread signal. The feedback information generation unit 5 generates feedback information from the transmission path estimation value of each antenna. The feedback information storage unit 6 stores the feedback information for a time corresponding to the number of slots, and absorbs a time lag until the generated feedback information is reflected in the received signal. The antenna weight estimation unit 7 estimates the antenna weight of the radio base station from the channel estimation value corresponding to the antenna # 2 and the pilot despread signal interpolated in the DPCH. The uplink synchronization state determination unit 8 determines the uplink synchronization state from the feedback information and the antenna weight estimation result, and grasps the state.

  The phase correction amount determination unit 9 determines the correction amount (phase rotation amount) of the transmission path estimation value from the feedback information, the antenna weight estimation result, and the uplink synchronization state. The transmission path estimated value correction unit 10 corrects the transmission path estimated value with this correction amount. The detector 11 detects (demodulates) the DPCH. The mixing unit 12 mixes transmission data and feedback information. The transmitter 13 converts the baseband signal into a radio (RF) signal and transmits it to the radio base station.

  Next, the operation will be described. A radio base station (not shown) transmits a common pilot channel CPICH and a dedicated traffic channel DPCH from two antennas (antennas # 1 and # 2), respectively. The receiving unit 1 of the wireless communication terminal apparatus performs reception such as frequency conversion, filtering, A / D conversion, etc. on a radio (RF) signal from a radio base station received as a received signal by a receiving antenna (not shown). Generate a baseband signal. Then, this is output to the DPCH despreading unit 2 and the CPICH despreading unit 3.

  The DPCH despreading unit 2 receives the received baseband signal from the receiving unit 1 and despreads it using the spreading code spreading the DPCH to generate DPCH data and pilot despread signals. Is output to the antenna weight estimation unit 7 and the detection unit 11.

  The CPICH despreading unit 3 despreads the baseband signal from the receiving unit 1 using a spreading code spreading the CPICH to generate a CPICH despread signal. Then, this is output to the transmission path estimation unit 4.

  The transmission path estimator 4 uses a modulation pattern orthogonal to each CPIB despread signal for each antenna of the radio base station, and uses a channel estimation value CPICH # 1 for each antenna of the radio base station (corresponding to antenna # 1). And CPICH # 2 (corresponding to antenna # 2). These are output to the feedback information generation unit 5, the antenna weight estimation unit 7 and the transmission path estimation value correction unit 10.

  The feedback information generation unit 5 estimates the antenna weight of the radio base station that provides the best DPCH data reception quality from the channel estimation values CPICH # 1 and CPICH # 2 for each antenna, and feedback information from the estimation result. Is generated and output. In order to improve the reception quality of the DPCH, the antenna weight of the antenna # 2 of the radio base station may be set so that the DPCH phase difference for each antenna becomes “0” during signal reception. That is, the phase difference between the transmission path estimation values for each antenna is obtained, and a value for which the difference is “0” is set as the weight of the antenna # 2, and feedback information is generated based on this.

  Specifically, first, the phase difference θ (0 ≦ θ <2π) of CPICH # 1 with respect to the transmission path estimated value CPICH # 2 of antenna # 2 is obtained. Next, since there are four types of antenna weights π / 4, 3π / 4, −3π / 4, and −π / 4 [rad] that can be transmitted by feedback information, the phase difference θ is quantized according to the table shown in FIG. The normalized phase difference θq is obtained. Based on the phase difference θq and the transmission slot number (odd slot or even slot) for transmitting feedback information, feedback information is determined according to the table of FIG. This is output to the feedback information storage unit 6 and the mixing unit 12.

  The feedback information storage unit 6 is provided to absorb the time lag in which the transmitted feedback information is set as the antenna weight in the radio base station, and after delaying the time corresponding to the predetermined number of slots, the antenna weight of the reception slot Is output to the uplink synchronization state determination unit 8 and the phase correction amount determination unit 9.

  The antenna weight estimation unit 7 extracts the pilot 2 transmitted from the antenna # 2 of the radio base station from the DPCH despread result, detects the phase difference between the pilot 2 and CPICH # 2, and sets the antenna set in the radio base station The weight, that is, feedback information received by the radio base station is estimated and output to the uplink synchronization state determination unit 8 and the phase correction amount determination unit 9.

  Specifically, first, a phase difference θ of pilot 2 with respect to the antenna transmission path estimated value CPICH # 2 (0 ≦ θ <2π) is obtained. Next, a quantized phase difference θq is obtained by quantizing the phase difference θ according to FIG. Further, feedback information is determined according to FIG. 3 from the quantization phase difference θq and the transmission slot number that transmitted the feedback information obtained by performing phase rotation of pilot 2 of the reception slot, and uplink synchronization state determination is performed as an antenna weight estimation result. To the unit 8 and the phase correction amount determination unit 9.

  The uplink synchronization state determination unit 8 determines the uplink synchronization state from the feedback information and the antenna weight estimation result. The uplink synchronization state has two states, an out-of-synchronization state and a synchronization establishment state. The synchronization establishment determination is performed during the out-of-synchronization state and the out-of-synchronization determination is performed during the synchronization establishment state.

  The synchronization establishment determination procedure performed by the uplink synchronization state determination unit 8 will be described with reference to FIG. First, in step S11, the feedback information and the antenna weight estimation result are compared, and if they match, the process proceeds to step S12, and if they do not match, the process proceeds to step S15. In step S12, the coincidence counter is counted up and the process proceeds to step S13. In step S13, the match counter value is compared with the synchronization establishment determination threshold value n1, and if the match counter value is greater than or equal to the synchronization establishment determination threshold value n1, the process proceeds to step S14, and if the match counter value is less than the synchronization establishment determination threshold value n1, the process is performed. finish. In step S14, the “state” is changed to the synchronization establishment state, and the process is terminated. In step S15, the match counter is initialized (= 0), and the process is terminated.

  Next, the out-of-synchronization determination procedure performed by the uplink synchronization state determination unit 8 will be described with reference to FIG. In FIG. 5, in step S21, the feedback information and the antenna weight estimation result are compared. If they do not match, the process proceeds to step S22, and if they match, the process proceeds to step S25. In step S22, the mismatch counter is counted up (+1), and the process proceeds to step S23. In step S23, the mismatch counter is compared with the out-of-synchronization determination threshold n2, and if the mismatch counter value is greater than or equal to the out-of-synchronization determination threshold n2, the process ends in step S24, and if the mismatch counter value is less than the out-of-synchronization determination threshold n2, the process ends. . In step S24, the synchronization state is changed to the out-of-synchronization state, and the process ends. In step S25, the mismatch counter is initialized (= 0) and the process is terminated.

  The phase correction amount determination unit 9 determines the correction amount of the transmission path estimation value from the uplink synchronization state and the feedback information or the antenna weight estimation result. If the uplink synchronization state is out of synchronization, the antenna weight estimation result is used to determine the correction amount. If the uplink synchronization state is a synchronization established state, feedback information is used to determine the correction amount. Specifically, the correction amount is determined according to FIG. 6 from the antenna weight estimation result or feedback information for two slots and the transmission slot number that transmitted the corresponding feedback information. As the antenna weight estimation result or feedback information for two slots, the latest one in which the slot numbers that transmitted the slots are a combination of an even number and an odd number is used.

  The transmission path estimation value correction unit 10 performs phase rotation on CPICH # 2 according to the phase correction amount, and then adds it to CPICH # 1 and outputs it to the detection unit 11 as a transmission path estimation value. The detection unit 11 detects DPCH data using the corrected transmission path estimation value and outputs reception data.

  As is apparent from the above, the radio communication terminal apparatus according to the present embodiment constitutes a communication system together with a radio base station having a plurality of antennas, receives radio signals transmitted via the antennas, and is based on the received signals A radio communication terminal apparatus that transmits feedback information to a radio base station, estimates a transmission path estimation value from a received signal, and performs detection using the transmission path estimation value.

  Then, a transmission path estimation unit 4 that generates a transmission path estimation value by estimating a transmission path state from the radio base station based on the reception signal, a feedback information generation section 5 that generates feedback information from the transmission path estimation value, a reception signal The antenna weight estimation unit 7 for estimating the antenna weight of the radio base station from the base station and generating the antenna weight estimation result, and whether the uplink synchronization state of the transmission path is out of synchronization state or synchronization establishment state from the feedback information and the antenna weight estimation result The uplink synchronization state determination unit 8 that determines which one of these is included.

  Further, a phase correction amount determination unit 9 that determines a phase rotation amount as a correction amount of the transmission channel estimation value from the feedback information, the antenna weight estimation result, and the uplink synchronization state, a transmission that corrects the transmission channel estimation value according to the phase rotation amount It includes a path estimation value correction unit 10 and a detection unit 11 that detects (demodulates) a traffic channel using the corrected transmission path estimation value.

  For this reason, the uplink synchronization state determination unit 8 determines whether the uplink synchronization state of the transmission line is out of synchronization state or synchronization establishment state, and based on the synchronization state, the correction amount of the transmission line estimation value The phase rotation amount determination method is selected as an appropriate method. As a result, even if downlink synchronization is maintained and uplink synchronization is lost, the phase rotation amount is appropriate as the correction amount. As a result, it is possible to reduce the demodulation performance degradation in the uplink out-of-synchronization state.

  In addition, in the radio communication terminal apparatus according to the present embodiment, the uplink synchronization state determination unit 8 is configured such that, in the uplink out-of-synchronization state, when the match between the feedback information and the antenna weight estimation result continues for a predetermined number of slots or more. In the uplink synchronization established state, the uplink synchronization lost state is established when the mismatch between the feedback information and the antenna weight estimation result continues for a predetermined number of slots or more in the uplink synchronization established state. Therefore, the uplink synchronization established state and the uplink synchronization loss state can be determined stably and reliably, and the operation of the apparatus is stabilized and the reliability is improved.

Embodiment 2. FIG.
In the first embodiment described above, the uplink synchronization state determination unit 8 uses the number of consecutive matching slots or the number of consecutive mismatches in the feedback information and the antenna weight estimation result to determine the uplink synchronization state. The determination may be made using the probability of matching slots in the period. The determination procedure will be specifically described below.

  A synchronization establishment determination procedure in the out-of-synchronization state performed by the uplink synchronization state determination unit 8 according to the present embodiment will be described with reference to FIG. In FIG. 7, first, in step S31, the coincidence counter is initialized (= 0). In the next step S32, the feedback information and the antenna weight estimation result are compared to determine whether they match or do not match. In step S33, the comparison result is stored in an internal storage area. In step S34, the number of matches in the latest sn1 slot stored in the storage area is counted. In step S35, it is determined whether the count number is larger than the synchronization establishment determination number p1. If larger, the process proceeds to step S36, and the uplink synchronization state is transitioned to the synchronization probability state. If it is smaller, the process is terminated.

  The out-of-synchronization determination procedure in the synchronization establishment state performed by the uplink synchronization state determination unit 8 of the present embodiment will be described with reference to FIG. In FIG. 8, first, in step S41, the mismatch counter is initialized (= 0). In the next step S42, the feedback information and the antenna weight estimation result are compared to determine whether they match or not. In step S43, the comparison result is stored in an internal storage area. In step S44, the number of mismatches in the latest sn2 slot stored in the storage area is counted. In step S45, it is determined whether the count number is larger than the synchronization establishment determination number p2. If larger, the process proceeds to step S46, and the uplink synchronization state is shifted to the out of synchronization state. If it is smaller, the process is terminated.

  As is apparent from the above, in the radio communication terminal apparatus according to the present embodiment, the uplink synchronization state determination unit 8 determines that the probability of coincidence between the feedback information and the antenna weight estimation result is equal to or greater than a predetermined probability when the uplink synchronization is out of synchronization. In this case, the uplink synchronization establishment state is established, and in the uplink synchronization establishment state, the uplink synchronization loss state is established when the mismatch probability between the feedback information and the antenna weight estimation result is a predetermined probability or more. Therefore, the uplink synchronization state is determined by the uplink synchronization state determination unit 8, and the phase rotation amount determination method can be optimized according to the synchronization state, and the demodulation performance degradation in the uplink out-of-synchronization state can be reduced. In addition, the uplink synchronization establishment state and the uplink synchronization loss state can be determined more stably and reliably, and the operation of the apparatus is stabilized and the reliability is improved.

Embodiment 3 FIG.
In the first and second embodiments described above, the phase correction amount determination unit 9 performs the determination only in the uplink state in order to determine the phase rotation amount, but the downlink quality may be added to the determination condition. good. FIG. 9 is a block diagram showing a configuration of a wireless communication terminal apparatus according to Embodiment 3 of the present invention. In the radio communication terminal apparatus according to the present embodiment, the DPCH configuration is the same as that of the radio communication terminal apparatus according to the first embodiment (FIG. 1). A reception quality measurement unit 14 for measuring reception quality is added. A signal power to interference power ratio (SIR: Signal to Interference Rate, hereinafter referred to as SIR), which is an output of the reception quality measurement unit 14, is input to the phase correction amount determination unit 9. Other configurations are the same as those of the first embodiment, and detailed description of the same parts is omitted.

  The reception quality measurement unit 14 calculates the DPCH signal power and interference power from the DPCH despread signal output from the DPCH despreading unit 3, and outputs the SIR. When the uplink synchronization state input from the uplink synchronization state determination unit 8 is the synchronization establishment state, the phase correction amount determination unit 9 compares the SIR with the signal quality determination threshold q, and when the SIR is q or more, The correction amount is determined using the antenna weight estimation result. If the SIR is less than q, feedback information is used to determine the correction amount. A specific correction amount determination method from the antenna weight estimation result or the feedback information is as described in the first embodiment.

  As is apparent from the above, the phase correction amount determination unit 9 of the radio communication terminal apparatus according to the present embodiment is based on the antenna weight estimation result when the downlink quality is not less than a predetermined value in the uplink synchronization established state. The correction amount is determined, and when the downlink quality is less than a predetermined value, the correction amount is determined based on the feedback information. As a result, when the uplink synchronization state is the synchronization established state, the phase rotation amount determination method can be optimized by adding the downlink quality to the channel estimation value correction amount determination. Can be improved.

  As described above, in the wireless communication terminal device according to the present invention, the base station transmits a signal to the wireless communication terminal device via a plurality of antennas, and the base station is configured based on the signal received by the wireless communication terminal device. This is useful for a wireless communication system that controls the phase of a signal transmitted from each antenna, and is particularly suitable for a wireless communication terminal apparatus of a wireless communication system that employs a W-CDMA system to which closed-loop transmission diversity is applied. Yes.

It is a block diagram which shows the structure of the radio | wireless communication terminal device of Embodiment 1 of this invention. It is a figure of the table which shows the relationship between the range of phase difference (theta), and quantization phase difference (theta) q which quantized phase difference (theta). It is a figure of a table which shows a mode that the feedback information with respect to quantization phase difference (theta) q changes with odd number / even number of a transmission slot number. 4 is a flowchart illustrating a synchronization establishment determination procedure performed by an uplink synchronization state determination unit according to the first embodiment. 6 is a flowchart illustrating a loss of synchronization determination procedure performed by an uplink synchronization state determination unit according to the first embodiment. It is a figure of the table which shows the relationship between the feedback information which changes with the odd number / even number of a transmission slot number, and the corrected amount of a transmission-line estimated value. 7 is a flowchart illustrating a synchronization establishment determination procedure in an out-of-synchronization state performed by an uplink synchronization state determination unit according to the second embodiment. 10 is a flowchart showing a loss of synchronization determination procedure in a synchronization establishment state performed by an uplink synchronization state determination unit according to the second embodiment. It is a block diagram which shows the structure of the radio | wireless communication terminal device of Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Receiver 2 DPCH despreading unit 3 CPICH despreading unit 4 Transmission path estimation unit 5 Feedback information generation unit 6 Feedback information storage unit 7 Antenna weight estimation unit 8 Link synchronization state determination unit 9 Phase correction amount determination unit 10 Transmission path estimation value Correction unit 11 Detection unit 12 Mixing unit 13 Transmission unit 14 Reception quality measurement unit

Claims (10)

A communication system is configured with a radio base station having a plurality of antennas, receives a radio signal transmitted through the antenna, transmits feedback information based on the received signal to the radio base station, and transmits from the received signal In a wireless communication terminal device that estimates a path estimation value and detects using the transmission path estimation value,
(A) a feedback information generation unit that generates feedback information from the channel estimation value;
(B) an antenna weight estimation unit that estimates an antenna weight of the radio base station from the received signal and generates an antenna weight estimation result;
(C) an uplink synchronization state determination unit that determines whether the uplink synchronization state of the transmission path is an out-of-synchronization state or a synchronization establishment state from the feedback information and the antenna weight estimation result;
(D) a phase correction amount determination unit that determines a phase rotation amount as a correction amount of the transmission path estimation value from the feedback information, the antenna weight estimation result, and the uplink synchronization state;
(E) A wireless communication terminal apparatus comprising: a transmission path estimation value correction unit that corrects the transmission path estimation value according to the phase rotation amount. (C) The uplink synchronization state determination unit
In the uplink out-of-synchronization state, when the match between the feedback information and the antenna weight estimation result continues for a predetermined number of slots or more, the uplink synchronization establishment state,
2. In the uplink synchronization established state, when the mismatch between the feedback information and the antenna weight estimation result continues for a predetermined number of slots or more, the uplink synchronization loss state is set. The wireless communication terminal device described. (C) The uplink synchronization state determination unit
In the uplink out-of-synchronization state, when the probability of matching between the feedback information and the antenna weight estimation result is a predetermined probability or more, the uplink synchronization establishment state,
2. The radio according to claim 1, wherein in the uplink synchronization establishment state, the uplink synchronization loss state is established when a mismatch probability between the feedback information and the antenna weight estimation result is a predetermined probability or more. Communication terminal device. (D) The phase correction amount determination unit determines the correction amount based on the antenna weight estimation result in the uplink out-of-synchronization state, and the feedback information in the uplink synchronization establishment state. The wireless communication terminal apparatus according to any one of claims 1 to 3, wherein the correction amount is determined based on: (D) In the uplink synchronization established state, the phase correction amount determination unit determines the correction amount based on the antenna weight estimation result when the downlink quality is equal to or higher than a predetermined value. The wireless communication terminal apparatus according to any one of claims 1 to 3, wherein when the quality is less than a predetermined value, the correction amount is determined based on the feedback information. A communication system is configured with a radio base station having a plurality of antennas, receives a radio signal transmitted via the antenna, transmits feedback information based on the received signal to the radio base station, and transmits from the received signal. A method of correcting the channel estimation value of a wireless communication terminal device that estimates a channel estimation value and detects using the channel estimation value,
(A) generating feedback information from the transmission path estimation value;
(B) estimating the antenna weight of the radio base station from the received signal to generate an antenna weight estimation result;
(C) determining whether the uplink synchronization state of the transmission path is an out-of-synchronization state or a synchronization establishment state from the feedback information and the antenna weight estimation result;
(D) determining a phase rotation amount as a correction amount of the transmission path estimation value from the feedback information, the antenna weight estimation result, and the uplink synchronization state;
(E) The transmission path estimation value is corrected according to the phase rotation amount. A method of correcting a transmission path estimation value of a wireless communication terminal device. (C) In the uplink out-of-synchronization state, when a match between the feedback information and the antenna weight estimation result continues for a predetermined number of slots or more, the uplink synchronization establishment state is established;
The uplink synchronization loss state is set when the uplink synchronization is established and the mismatch between the feedback information and the antenna weight estimation result continues for a predetermined number of slots or more. A method of correcting a transmission path estimation value of the wireless communication terminal device according to claim. (C) In the uplink out-of-synchronization state, when the matching probability between the feedback information and the antenna weight estimation result is a predetermined probability or more, the uplink synchronization establishment state is established,
7. The radio according to claim 6, wherein, in the uplink synchronization established state, the uplink synchronization loss state is established when a mismatch probability between the feedback information and the antenna weight estimation result is a predetermined probability or more. A method for correcting a transmission path estimation value of a communication terminal device. (D) determining the correction amount based on the antenna weight estimation result in the uplink out-of-synchronization state;
9. The transmission path estimation value of the radio communication terminal apparatus according to claim 6, wherein the correction amount is determined based on the feedback information when the uplink synchronization is established. 10. Correction method. (D) In the case where the uplink synchronization is established, when the downlink quality is equal to or higher than a predetermined value, the correction amount is determined based on the antenna weight estimation result, and when the downlink quality is lower than the predetermined value, the feedback The correction amount is determined based on information. The method of correcting a channel estimation value of a wireless communication terminal device according to any one of claims 6 to 8, wherein the correction amount is determined.

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