JP2005348182A - Cdma receiver and receiving method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance estimation accuracy of base station phase control value by correcting error in antenna verification results in a CDMA receiver comprising an antenna verification means for estimating the base station phase control value at the time of transmission diversity CL1 of a desired channel where the base station transmission power ratio between CPICH and the desired channel is constant in some time section or at all times. <P>SOLUTION: An antenna verification error correcting section 111 performs error correction processing of base station phase control estimation value Wms estimated at an antenna verification section 109 using the outputs from desired channel despread sections 106a and 106b, by making a decision whether the ratio between a CPICH receiving power calculated using its base station phase control estimation value Wms and a desired channel receiving power is constant, and outputs a base station phase control estimation value Wcorrect subjected to error correction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a CDMA receiver and a CDMA reception method used in a mobile station in a code division multiple access (CDMA) mobile communication system.

  In a CDMA mobile communication system standardized by 3GPP (3rd Generation Partnership Project), three types of transmission diversity methods are STTD (Space Time Transmit Diversity), CL1 (Closed Loop Mode 1), and CL2 (Closed Loop Mode 2). The method is defined.

  In transmission diversity CL1, the mobile station transmits an uplink command so that the combined vector of transmission signals transmitted from the two base station antennas becomes maximum at the receiving antenna end of the mobile station, and the base station responds to the uplink command. Controls the phase of the desired channel (for example, DPCH (Dedicated Pilot Channel) or HSPSCH (High Speed Physical Downlink Shared Channel)) on the antenna 2. Therefore, the phase of CPICH (Common Pilot Channel) used for phase estimation and the phase of the desired channel Therefore, CPICH cannot be used for phase estimation as it is.

Therefore, in the mobile device, antenna verification is performed to estimate the phase control value on the base station antenna 2 side, and the estimated base station phase control value is added to the phase estimation value calculated from CPICH to obtain a desired value. Used for channel synchronous detection. Non-Patent Document 1 describes an example of this antenna verification method. In this method, the base station phase control value is estimated by measuring the phase difference between the CPICH on the base station antenna 2 side and the DPCH under phase control.
3GPP TS25.214 V5.4.0 Annex A (informative)

  Since the base station phase control value at the time of transmission diversity CL1 takes a value for every π / 2, if the estimation of the base station phase control value is incorrect, the phase estimation accuracy becomes very bad, and the reception quality is greatly deteriorated. Therefore, at the time of transmission diversity CL1, improving the estimation accuracy of the base station phase control value is a very important issue.

  The present invention has been made in view of such a point, and the antenna verification is performed in the transmission diversity ratio CL1 of the desired channel as defined by a certain time interval or a constant transmission power ratio between the CPICH and the desired channel. An object of the present invention is to provide a CDMA receiving apparatus and method capable of correcting an error in a base station phase control estimation value calculated in (1).

  In order to solve this problem, the CDMA receiver according to the present invention provides base station phase control in the transmission diversity of a desired channel in which the base station transmission power ratio between the CPICH and the desired channel is always constant or constant. In a CDMA receiver having an antenna verification means for estimating a value, a base estimated by the antenna verification means is used as an antenna verification error correction means for correcting an estimation result by the antenna verification means. CPICH reception power calculation means for measuring CPICH reception power based on a station phase control value, desired channel reception power calculation means for measuring reception signal power of a desired channel, and the CPICH reception power and the desired channel reception power Received power to calculate received power ratio A ratio calculation means, a reference reception power ratio estimation means for estimating a true reception power ratio from the reception power ratio, and a reception calculated using the other possible base station phase control value for the base station phase control value An error that corrects an error in the base station phase control value estimated by the antenna verification means by comparing the difference between the true received power ratio and the estimated received power ratio between the power ratio and the received power ratio. And a correcting means.

  According to this configuration, it is possible to correct an error in the antenna verification result by using the fact that the ratio of the CPICH transmission power from the base station to the desired channel transmission power is constant, so that the base station phase control value The estimation accuracy of can be improved.

  In the CDMA receiver according to the present invention as set forth in the invention described above, the reference received power ratio estimating means for estimating the true received power ratio includes a threshold setting means for setting a threshold, and a reception for comparing the threshold and the received SIR. An SIR threshold comparing / determining unit; and an average calculating unit that calculates an average value of received power ratios in slots in which the received SIR is determined to be equal to or greater than the threshold value, and outputs the average value to the error correcting unit as a true received power ratio; The structure which comprises is taken.

  According to this configuration, it is possible to correct an error in the antenna verification result by using the fact that the ratio of the CPICH transmission power from the base station to the desired channel transmission power is constant, so that the base station phase control value The estimation accuracy of can be improved.

  In the CDMA receiver according to the present invention, in the above invention, the reference received power ratio estimating means for estimating the true received power ratio includes a maximum value detecting means for detecting a maximum value of the received SIR, and the received SIR is The received power ratio in the slot detected as the maximum is estimated as a true received power ratio, and the received power ratio calculated using the other possible base station phase control value with respect to the base station phase control value and the received power And an error correction unit that compares a difference between a true reception power ratio and an estimated reception power ratio and corrects an error in a base station phase control value estimated by the antenna verification unit. Take the configuration.

  According to this configuration, it is possible to correct an error in the antenna verification result by using the fact that the ratio of the CPICH transmission power from the base station to the desired channel transmission power is constant, so that the base station phase control value The estimation accuracy of can be improved. In addition, a reduction in the processing amount can be expected by estimating the true reception power ratio as the reception power ratio in the slot where the reception SIR is detected as the maximum. Furthermore, since error correction processing is performed for slots whose reception SIR is equal to or less than the threshold value, correction processing in slots that do not need to be corrected can be omitted, and further reduction in processing amount can be expected.

  In the CDMA receiver according to the present invention, in the above invention, the CPICH received power calculating means and the received power ratio calculating means calculate the received power ratio using the other possible base station phase control value. A configuration is provided that includes means for performing only the slot determined to be equal to or less than the threshold by the threshold comparison determination means, and the error correction means is configured to include means for performing the correction processing only for the slot determined to be equal to or less than the threshold.

  According to this configuration, it is possible to correct an error in the antenna verification result by using the fact that the ratio of the CPICH transmission power from the base station to the desired channel transmission power is constant, so that the base station phase control value The estimation accuracy of can be improved. In addition, since error correction processing is performed only for slots whose reception SIR is equal to or less than the threshold value, correction processing in slots that do not need to be corrected can be omitted, and the amount of processing can be reduced.

  The CDMA receiver according to the present invention, in the above invention, is a reception power ratio threshold setting means for setting a reception power ratio threshold, and a reception power ratio threshold comparison determination means for comparing the reception power ratio threshold and the reception power ratio. And the CPICH reception power calculation means and the reception power ratio calculation means calculate the reception power ratio using the other possible base station phase control value by the reception power ratio threshold determination means. And a means for performing the correction processing only for the slot determined to be equal to or less than the threshold value.

  According to this configuration, it is possible to correct an error in the antenna verification result by using the fact that the ratio of the CPICH transmission power from the base station to the desired channel transmission power is constant, so that the base station phase control value The estimation accuracy of can be improved. In addition, since the error correction process is performed only for the slot having a large error from the true reception power ratio Kref, the correction process in the slot that does not need to be corrected can be omitted, and the processing amount can be reduced.

  The CDMA reception method according to the present invention is an antenna verification method for estimating the base station phase control value when the transmission power ratio CL1 of the desired channel is such that the base station transmission power ratio between the CPICH and the desired channel is constant or always constant. In the CDMA receiver including the verification step, the antenna verification error correction step for correcting the estimation result by the antenna verification step is based on the base station phase control value estimated by the antenna verification means. CPICH received power calculation step for measuring the CPICH received power, desired channel received power calculating means for measuring the received signal power of the desired channel, and reception for calculating the received power ratio between the CPICH received power and the desired channel received power. Power ratio calculation step and the received power A reference received power ratio estimating step for estimating a true received power ratio from a ratio, a received power ratio calculated using the other possible base station phase control value with respect to the base station phase control value, and the received power ratio, An error correction step of comparing a difference between the true received power ratio and the estimated received power ratio and correcting an error in the base station phase control value estimated by the antenna verification means. I made it.

  According to this method, the error in the antenna verification result can be corrected using the fact that the ratio between the CPICH transmission power from the base station and the desired channel transmission power is constant, so that the base station phase control value The estimation accuracy of can be improved.

  In the CDMA reception method according to the present invention as set forth in the invention described above, the reference reception power ratio estimation step for estimating the true reception power ratio includes a threshold setting step for setting a threshold, and a reception for comparing the threshold with a reception SIR. An SIR threshold comparison determination step, and an average calculation step of calculating an average value of the reception power ratios in the slots in which the reception SIR is determined to be equal to or greater than the threshold value and passing the average value to the error correction step as a true reception power ratio It was made to have.

  According to this method, the error in the antenna verification result can be corrected using the fact that the ratio between the CPICH transmission power from the base station and the desired channel transmission power is constant, so that the base station phase control value The estimation accuracy of can be improved.

  In the CDMA reception method according to the present invention, in the above invention, the reference reception power ratio estimation step of estimating the true reception power ratio includes a maximum value detection step of detecting a maximum value of the reception SIR, and the reception SIR includes: The received power ratio in the slot detected as the maximum is estimated as a true received power ratio, and the received power ratio calculated using the other possible base station phase control value with respect to the base station phase control value and the received power And an error correction step of comparing a difference between a true received power ratio and an estimated received power ratio and correcting an error in a base station phase control value estimated by the antenna verification means. I did it.

  According to this method, the error in the antenna verification result can be corrected using the fact that the ratio between the CPICH transmission power from the base station and the desired channel transmission power is constant, so that the base station phase control value The estimation accuracy of can be improved. In addition, since the estimation of the true received power ratio is made the received power ratio in the slot where the received SIR is detected as the maximum, a reduction in processing amount can be expected, and error correction processing is performed for the slot whose received SIR is equal to or less than the threshold value. As a result, correction processing in slots that do not need to be corrected can be omitted, and further reduction in processing amount can be expected.

  In the CDMA reception method according to the present invention, in the above invention, the CPICH reception power calculation step and the reception power ratio calculation step calculate a reception power ratio using the other possible base station phase control value. A step of performing only the slot determined to be equal to or less than the threshold in the threshold comparison determination step is provided, and the error correction step is also provided to a step of performing the correction process only for the slot determined to be equal to or less than the threshold.

  According to this method, the error in the antenna verification result can be corrected using the fact that the ratio between the CPICH transmission power from the base station and the desired channel transmission power is constant, so that the base station phase control value The estimation accuracy of can be improved. In addition, since error correction processing is performed only for slots whose reception SIR is equal to or less than the threshold value, correction processing in slots that do not need to be corrected can be omitted, and the amount of processing can be reduced.

  The CDMA reception method according to the present invention is the reception power ratio threshold value setting step for setting the reception power ratio threshold value, and the reception power ratio threshold value comparison and determination step for comparing the reception power ratio threshold value and the reception power ratio in the above invention. The CPICH reception power calculation step and the reception power ratio calculation step include calculating a reception power ratio using the other possible base station phase control value in the reception power ratio threshold determination step. Means for performing only the slot determined as follows is provided, and the error correction means is also provided with a step of performing the correction processing only for the slot determined as not more than the threshold.

  According to this method, the error in the antenna verification result can be corrected using the fact that the ratio between the CPICH transmission power from the base station and the desired channel transmission power is constant, so that the base station phase control value The estimation accuracy of can be improved. In addition, since the error correction process is performed only for the slot having a large error from the true reception power ratio Kref, the correction process in the slot that does not need to be corrected can be omitted, and the processing amount can be reduced.

  A communication terminal apparatus according to the present invention employs a configuration including any one of the above CDMA receivers.

  According to this configuration, it is possible to correct an error in the antenna verification result by using the fact that the ratio of the CPICH transmission power from the base station to the desired channel transmission power is constant, so that the base station phase control value The estimation accuracy of can be improved. In addition, since the error correction process is performed only for the slot having a large error from the true reception power ratio Kref, the correction process in the slot that does not need to be corrected can be omitted and the processing amount can be reduced.

  The program according to the present invention performs antenna verification for estimating a base station phase control value in a transmission diversity of a desired channel in which the base station transmission power ratio between the CPICH and the desired channel is constant or always constant. In the program comprising the procedure, as the antenna verification error correction procedure for correcting the estimation result by the antenna verification procedure, the CPICH received power based on the base station phase control value estimated by the antenna verification procedure CPICH received power calculation procedure for measuring the desired channel received power calculation procedure for measuring the received signal power of the desired channel, and received power ratio calculation procedure for calculating the received power ratio between the CPICH received power and the desired channel received power And true from the received power ratio The reference received power ratio estimation procedure for estimating the received power ratio, the received power ratio calculated using the other possible base station phase control value with respect to the base station phase control value, and the received power ratio are true. An error correction procedure for comparing the difference between the received power ratio and the estimated received power ratio and correcting an error in the base station phase control value estimated by the antenna verification procedure is adopted.

  According to this configuration, it is possible to correct an error in the antenna verification result by using the fact that the ratio of the CPICH transmission power from the base station to the desired channel transmission power is constant, so that the base station phase control value The estimation accuracy of can be improved. In addition, since the error correction process is performed only for the slot having a large error from the true reception power ratio Kref, the correction process in the slot that does not need to be corrected can be omitted, and the processing amount can be reduced.

  According to the present invention, the antenna verification means for estimating the base station phase control value at the time of transmission diversity CL1 of the desired channel such that the base station transmission power ratio between the CPICH and the desired channel is always constant or constant. Since the error of the antenna verification result can be corrected in the CDMA receiver having the above, the estimation accuracy of the base station phase control value can be improved.

  The essence of the present invention is that the base station phase control estimation is estimated by antenna verification at the time of transmission diversity CL1 of the desired channel in which the base station transmission power ratio between CPICH and the desired channel is always constant or constant. It is determined whether the ratio of the CPICH received power calculated using the value and the desired channel received power is constant, the error in the antenna verification result is corrected, and the estimation accuracy of the base station phase control value is increased. It is to improve. Note that the desired channel corresponds to, for example, HSPDSCH defined in 3GPP.

  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 CDMA receiving apparatus according to Embodiment 1 of the present invention. In the CDMA receiver 100 shown in FIG. 1, the received signal received by the antenna 101 is input to a received RF (Radio Frequency) unit 102. The reception RF unit 102 converts a reception signal, which is a radio frequency, into an analog signal in a baseband band and outputs it to the AD converter 103. The AD converter 103 converts the received baseband analog signal into a digital signal. CPICH despreading sections 104a and 104b and DPCH despreading sections 105a and 105b corresponding to each finger and desired channel despreading sections 106a and 106b receive the received baseband digital signal and despread corresponding to each channel. Despread with code. Here, the desired channel is a channel defined such that the base station transmission power ratio between the CPICH and the desired channel is constant for a certain time interval or as described above.

  The CPICH phase estimation units 107a and 107b and the DPCH phase estimation units 108a and 108b receive the outputs of the CPICH despreading units 104a and 104b and the DPCH despreading units 105a and 105b, and calculate phase estimation values from the known signals included therein. During transmission diversity CL1, the phase estimation value in the transmission signal from the base station antenna 2 side is output to the antenna verification unit 109 and the synchronous detection units 112a and 112b. In addition, an SIR (Signal to Interference Ratio) measurement unit 110 measures received signal power (RSCP) and interference signal power (ISCP) to measure an antenna. The data is output to the verification unit 109.

  In the antenna verification unit 109, for example, the antenna verification calculation for estimating the base station phase control value Wbs is performed by the method described in Non-Patent Document 1 described above, and the result is output to the antenna verification error correction unit 111. The antenna verification error correction unit 111 performs error correction processing of the base station phase control estimation value Wms estimated by the antenna verification unit 109 using the outputs of the desired channel despreading units 106a and 106b, and performs the base station phase correction. It is determined whether or not the ratio between the CPICH received power calculated using the control estimated value Wms and the desired channel received power is constant, and an error-corrected base station phase control estimated value Wcorrect is assigned to each finger. It outputs to the synchronous detection part 112a, 112b.

  In the synchronous detectors 112a and 112b corresponding to each finger, the error-corrected base station phase control estimation value Wcorrect and the CPICH phase estimation values and DPCH phase output from the CPICH phase estimation units 107a and 107b and the DPCH phase estimation units 108a and 108b Synchronous detection of the desired channel is performed using the estimated value and the outputs of the desired channel despreading units 106 a and 106 b, and the result is output to the Rake combining unit 113. The Rake combining unit 113 performs Rake combining of the values after synchronous detection in each finger. Channel decoding section 114 performs channel decoding processing on the output of Rake combining section 113.

  Next, the antenna verification error correction unit 111, which is the point of the present invention, will be described with reference to FIG. FIG. 2 is a block diagram illustrating a configuration of the antenna verification error correction unit 111.

  In FIG. 2, CPICH reception power calculation section 201 calculates transmission diversity-considered CPICH reception power from base station phase control estimation value Wms estimated by antenna verification section 109 and the CPICH phase estimation value of each antenna, and receives power The data is output to the ratio calculation unit 203 and the error correction unit 207. Regarding the calculation method, since the desired channel is obtained by multiplying the base station phase control value Wbs by the signal on the antenna 2 side in the base station, the phase estimation value on the CPICH base station antenna 2 side is similarly calculated for the CPICH. What is necessary is just to multiply by the phase control estimated value Wms. Therefore, the CPICH received power considering transmission diversity can be calculated using the following equation (1).

CPICH received power considering transmission diversity
= (CPICH (ant1) + CPICH (ant2) * Wms _) ^ 2 (1)
In Equation (1), CPICH (ant No.) represents CPICH phase estimation values I and Q at each antenna, and CPICH (ant2) * Wms represents complex multiplication.

  The desired channel received power calculation unit 202 obtains desired channel received power based on the desired channel despread signals from the desired channel despreading units 106 a and 106 b and outputs the desired channel received power to the received power ratio calculation unit 203. Reception power ratio calculation section 203 calculates reception power ratio K between desired channel reception power and transmission diversity consideration CPICH reception power in each slot, and outputs the result to average calculation section 206.

  Here, if the base station phase control estimation value Wms is correct, the transmission diversity considering CPICH reception power obtained by the above-described calculation method is such that the reception power ratio K to the desired channel is in a section where the base station transmission power ratio is constant. Should be constant. This will be described with reference to FIG. FIG. 3 is a diagram illustrating a relational characteristic between the received power ratio and the actually measured received SIR value for explaining the calculation contents in the CPCIH received power calculating unit 201.

  In FIG. 3, reference numerals 301, 302, and 303 are shown as reception power ratios. Reference numeral 301 denotes a reception power ratio calculated for each slot. It is shown that the received power ratio is distributed in a low region and a high region. Reference numeral 302 shown in the region where the reception power ratio is high is a theoretical value of the reception power ratio when the base station phase control estimation value Wms is correct. Reference numeral 303 shown in the low reception power ratio region is a theoretical reception power ratio value when the base station phase control estimation value Wms is incorrect. In the actual environment, the received power ratio 301 calculated for each slot is the same as the received power ratio theoretical value 302 and the base station phase control estimated value Wms when the base station phase control estimated value Wms is correct due to interference components. It is shown that there is a variation around the received power ratio theoretical value 303 in the case of an error.

  In the antenna verification specified in the 3GPP, a binary base station phase control value Wbs is estimated in each slot. Since the received power ratio theoretical value 302 when the base station phase control estimated value Wms is correct cannot be actually known, the received power ratio theoretical value 302 when the base station phase control estimated value Wms is correct is estimated. It will be. The estimation method will be described with reference to FIG. FIG. 4 is a diagram showing a relational characteristic between the received power ratio and the received SIR actual measurement value for explaining the content of estimating the correct received power ratio shown in FIG. 3 from the calculated value in the average calculating unit 206.

  In FIG. 4, reference numerals 401, 402, and 403 are shown as reception power ratios in addition to the above reference numerals 302 and 303. Also shown is a received SIR threshold 404 as SIR. Reference numeral 401 indicates a received power ratio K that is greater than or equal to a certain received SIR threshold 404. Reference numeral 402 indicates a reception power ratio K that is equal to or lower than a certain reception SIR threshold 404. Reference numeral 403 represents a value Kref (output of the average calculation unit 206) obtained by estimating the true reception power ratio.

  In a slot having a high measured SIR value, the accuracy of antenna verification, that is, the reliability of the received power ratio K is high. Therefore, in FIG. 4, the average value of the received power ratio K401 in the slot where the received SIR is equal to or greater than a certain threshold 404 is obtained, and the value Kref403 is the received power ratio 302 when the base station phase control estimated value Wms is correct. Estimated.

  Now, in FIG. 2, the threshold value setting unit 204 sets a threshold value to be compared with the measurement SIR. The threshold set in the threshold setting unit 204 is output to the reception SIR threshold determination / comparison unit 205. Note that the reception SIR threshold 404 shown in FIG. 4 only needs to select a slot having a high reception SIR, and may be a value obtained by multiplying the SIR value measured by the SIR measurement unit 110 by a coefficient, for example. In addition, it is possible to simply select the one having a large reception level measured from CPICH or the like.

  The reception SIR threshold comparison / determination unit 205 outputs the slot number (Slot No.) in which the measured SIR is larger than the reception SIR threshold 404 to the average calculation unit 206. The average calculation unit 206 outputs the average value of the reception power ratio K in the slot whose measured SIR is equal to or greater than the reception SIR threshold 404 to the error correction unit 207 as the correct reception power ratio Kref 403.

  Next, a process in which the base station phase control estimated value Wms estimated by the antenna verification unit 109 is corrected by the antenna verification error correction unit 111 will be described with reference to FIG. FIG. 5 shows the received power ratio and the received SIR measured value for explaining the process in which the base station phase control estimated value estimated by the antenna verification shown in FIG. 1 is corrected by the antenna verification error correcting unit. FIG.

  In FIG. 5, reference numeral 501 indicates the received power ratio K based on the base station phase control estimated value Wms. Reference numeral 502 indicates a received power ratio K ′ based on the base station phase control estimated value Wms ′. Reference numeral 503a indicates the distance (difference) between the reception power ratio based on the base station phase control estimation value Wms ′ and the value Kref obtained by estimating the true reception power ratio in the slot number m (slot no. M). Reference numeral 503b indicates a distance (difference) between the reception power ratio based on the base station phase control estimation value Wms ′ and the value Kref obtained by estimating the true reception power ratio in the slot number m (slot no. M). Reference numeral 504a indicates a distance (difference) between the reception power ratio based on the base station phase control estimation value Wms ′ and the value Kref obtained by estimating the true reception power ratio in the slot number n (slot no. N). Reference numeral 504b indicates a distance (difference) between the reception power ratio based on the base station phase control estimation value Wms ′ in the slot number n (slot no. N) and the value Kref obtained by estimating the true reception power ratio.

  CPICH received power calculation section 201 receives transmission diversity consideration CPICH reception when base verification control value Wms 'is another possible base station control estimation value Wms' with respect to base station control estimation value Wms. The power is also calculated and given to the received power ratio calculation unit 203. The reception power ratio calculation unit 203 calculates the reception power ratio K ′ 502 and outputs it to the average calculation unit 206.

  In the error correction unit 207, which of the received power ratio K501 obtained from the base station phase control estimated value Wms and the transmission diversity consideration received power ratio K′502 obtained from the base station phase control estimated value Wms ′ is the correct answer. It is determined whether it is close to the estimated received power ratio value Kref 403, and the closer value is output as the correct base station phase control estimated value Wcorrect. This is because, as described above, if the base station phase control estimated value Wms is correct, the reception power ratio K is near Kref 403.

  FIG. 5 shows the state of the base station phase control estimated value Wms correction process for slot number m (slot no.m) and slot number n (slot no.n). In the slot number m, the distance 503a between the received power ratio K and the value Kref based on the base station phase control estimated value Wms and the distance 503b between the received power ratio K ′ and the value Kref403 based on the base station phase control estimated value Wms ′ are obvious. Therefore, the base station phase control estimated value Wms ′ is output as the corrected base station phase control estimated value Wcorrect.

  In the slot number m, it can be seen that the base station phase control estimation value Wms value estimated first is corrected to the base station phase control estimation value Wms ′ by the error correction processing. On the other hand, in slot number n, as in slot number m, a comparison is made between distance 504a between base station phase control estimated value Wms and value Kref403 and distance 504b between base station phase control estimated value Wms ′ and value Kref403. Since the base station phase control estimated value Wms is obviously smaller, the base station phase control estimated value Wms is output as the corrected phase estimated control value Wcorrect. In the slot number n, it can be seen that the base station phase control estimated value Wms that has been correctly estimated is not erroneously corrected by the error correction unit 207.

  Depending on the antenna verification method, the base station phase control estimation value Wms may take four values. In that case, for the remaining three base station phase control estimation values Wms, the distance to the correct reception power ratio is calculated, and the closest one is used as the corrected base station phase control estimation value Wcorrect, thereby making the base station The phase control estimated value Wms can be corrected. Note that the CPICH received power calculation unit 201 can also be included in the function of the SIR measurement unit 110. In this case, the CPICH received power calculation unit 201 can be omitted in the antenna verification error correction unit 111. .

  As described above, according to the first embodiment, the error in the antenna verification result is corrected by using the fact that the ratio between the CPICH transmission power from the base station and the transmission power of the desired channel is constant. Therefore, the estimation accuracy of the base station phase control value can be improved. In addition, as a desired channel, HSPDSCH etc. with which the transmission power ratio with CPICH is prescribed | regulated as constant among 3 slots can be considered.

(Embodiment 2)
FIG. 6 is a block diagram showing a configuration of an antenna verification error correction unit provided in the CDMA receiver according to Embodiment 2 of the present invention. In FIG. 6, the same or equivalent components as those shown in FIG. 2 (Embodiment 1) are denoted by the same reference numerals. Here, the description will be focused on the portion related to the second embodiment.

  That is, as shown in FIG. 6, the antenna verification error correction unit 600 according to the second embodiment has a reception SIR threshold comparison / determination unit in place of the reception SIR threshold comparison / determination unit 205 in the configuration shown in FIG. 601 is provided. Further, a CPICH reception power calculation unit 602 is provided instead of the CPICH reception power calculation unit 201.

  In FIG. 6, reception SIR threshold comparison / determination section 601 outputs a slot number (Slot No.) that is equal to or less than the threshold to CPICH reception power calculation section 602. CPICH received power calculation section 602 calculates transmission diversity-considered CPICH received power for base station phase control estimated value Wms ′ in a slot equal to or less than the threshold, and received power ratio calculation section 203 calculates received power ratio K.

  In error correction section 207, only for the slot, as in the first embodiment, reception power ratio K corresponding to base station phase control estimation value Wms and reception corresponding to base station phase control estimation value Wms ′ are received. It is determined which of the power ratios K ′ is close to the estimated received power ratio Kref, and the closer one, that is, the one with the smaller difference is output as the base station phase control estimation value Wcorrect. This is because a slot having a high possibility of being erroneous is a low reception SIR, and therefore the amount of processing can be reduced by performing error correction processing only for a slot whose reception SIR is equal to or less than a certain threshold.

  Thus, according to the present second embodiment, as in the first embodiment, by utilizing the fact that the transmission power ratio between the CPICH transmission power from the base station and the desired channel transmission power is constant, the antenna Since an error in the verification result can be corrected, the estimation accuracy of the base station phase control value can be improved. In addition, since error correction processing is performed only for slots whose reception SIR is equal to or less than the threshold value, correction processing in slots that do not need to be corrected can be omitted, and the amount of processing can be reduced.

(Embodiment 3)
FIG. 7 is a block diagram showing a configuration of an antenna verification error correction unit provided in the CDMA receiver according to Embodiment 3 of the present invention. In FIG. 7, the same reference numerals are given to the same or equivalent components as those shown in FIG. 2 (Embodiment 1). Here, the description will focus on the part related to the third embodiment.

  That is, as shown in FIG. 7, in antenna verification error correction section 700 according to Embodiment 3, in the configuration shown in FIG. 2, reception power ratio threshold comparison determination section 701 and reception power ratio threshold comparison setting section 702 is added. Further, a CPICH reception power calculation unit 703 is provided instead of the CPICH reception power calculation unit 201.

  In the third embodiment, the method for determining that the base station phase estimation value Wms may be incorrect differs from the second embodiment in the slot where the reception power ratio K is more than a certain threshold from the value Kref. Determines that there is a possibility of an error, calculates again the transmit diversity-considered CPICH received power based on the base station phase estimation value Wms ′, and calculates the received power ratio K. Hereinafter, a description will be given with reference to FIG.

  FIG. 8 is a diagram showing a relational characteristic between the received power ratio and the received SIR actual measurement value for explaining the operations of the received power ratio threshold setting unit and the received power ratio threshold comparison / determination unit shown in FIG. FIG. 8 shows processing operations of the reception power ratio threshold setting unit 702 and the reception power ratio threshold comparison determination unit 701 using the characteristic relationship shown in FIG.

  In FIG. 8, the received power ratio threshold value comparison / determination unit 701 sets a received power ratio threshold value 801 as a received power ratio threshold value 801 that is a certain value lower than the correct received power ratio Kref 403. Note that the reception power ratio threshold 801 may be a threshold that is multiplied by a coefficient in the reception power ratio Kref 403 or may be a fixed value. Further, when the reception SIR is high using the reception SIR, the antenna verification and the measurement accuracy of the reception power ratio are also high. Therefore, when the reception power ratio threshold 801 is reduced and the reception SIR is poor, the reception power is low. For example, the ratio threshold 801 may be increased.

  The reception power ratio threshold setting unit 702 sets the reception power ratio threshold comparison determination unit 701 out of the reception power ratio between the desired channel reception power calculated by the reception power ratio calculation unit 203 and the transmission diversity consideration CPICH reception power in each slot. The slot of the received power ratio 402 that is lower than the received power ratio threshold 801 is determined to be a slot with a possibility of error, and the slot number (Slot No.) is output to the CPICH received power calculation unit 703. In FIG. 8, the received power ratio 802 distributed in the vicinity of the received power ratio theoretical value 303 when the base station phase control estimated value Wms is incorrect includes many received power ratios K402 that are far from the received power ratio threshold value 801. Therefore, the received power ratio threshold value comparison / determination unit 701 indicates a slot of the received power ratio that is determined to be erroneous.

  Similar to CPICH received power calculating section 602, CPICH received power calculating section 703 calculates a transmit diversity-considered CPICH received power for base station phase control estimated value Wms ′ in a slot equal to or less than the threshold, and received power ratio calculating section 203. Calculates the received power ratio K ′.

  In error correction section 207, only for the slot determined to have the above error, as in Embodiment 1, received power ratio K corresponding to base station phase control estimated value Wms, and base station phase control It is determined which of the received power ratios K ′ corresponding to the estimated value Wms ′ is closer to the estimated received power ratio Kref, and the smaller difference is output as the base station phase control estimated value Wcorrect.

  Thus, according to the present third embodiment, as in the first embodiment, by using the fact that the transmission power ratio between the CPICH transmission power from the base station and the desired channel transmission power is constant, the antenna Since an error in the verification result can be corrected, the estimation accuracy of the base station phase control value can be improved. In addition, since error correction processing is performed only for those having a large error from the correct reception power ratio Kref, correction processing in slots that do not need to be corrected can be omitted, and the amount of processing can be reduced, as in the second embodiment. it can.

(Embodiment 4)
FIG. 9 is a block diagram showing a configuration of an antenna verification error correction unit provided in the CDMA receiver according to Embodiment 4 of the present invention. In FIG. 9, the same reference numerals are given to the same or equivalent components as those shown in FIG. 2 (Embodiment 1). Here, the description will be focused on the portion related to the fourth embodiment.

  That is, as shown in FIG. 9, in antenna verification error correction section 900 according to the fourth embodiment, threshold setting section 204 is omitted from the configuration shown in FIG. Instead, a maximum value detection unit 901 is provided. Further, the average calculation unit 206 is deleted, and an error correction unit 902 is provided instead of the error correction unit 207.

  Maximum value detection section 901 detects the maximum value of the received SIR and gives the slot number (Slot No.) at the maximum value to error correction section 902. The error correction unit 902 estimates the reception power ratio K of the slot at the maximum value of the reception SIR indicated by the maximum value detection unit 901 among the reception power ratios K calculated by the reception power ratio calculation unit 205 as the correct reception power ratio Kref. As in the first embodiment, the reception power ratio K corresponding to the base station phase control estimation value Wms and the reception power ratio K ′ corresponding to the base station phase control estimation value Wms ′ are estimated to be correct. It is determined whether the power ratio is close to Kref, and the smaller difference is output as the base station phase control estimated value Wcorrect.

  As described above, according to the fourth embodiment, the error of the antenna verification result is corrected by using the fact that the transmission power ratio between the CPICH transmission power from the base station and the desired channel transmission power is constant. Therefore, it is possible to improve the estimation accuracy of the base station phase control value. In addition, since the reception power ratio of the slot at the maximum value of the reception SIR is estimated as the correct reception power ratio Kref, a reduction in processing amount can be expected. Note that the correct reception power ratio Kref estimation method according to the fourth embodiment can be used in combination with the estimation methods according to the second and third embodiments.

  The present invention corrects an error in the antenna verification result when the base station transmission power ratio between the CPICH and the desired channel is a certain time interval or when transmission diversity CL1 of the desired channel is constant, and the base station phase This is suitable for improving the estimation accuracy of the control value.

1 is a block diagram showing a configuration of a CDMA receiving apparatus according to Embodiment 1 of the present invention The block diagram which shows the structure of the antenna verification error correction part shown in FIG. The figure which shows the relational characteristic of the reception power ratio and reception SIR actual value for demonstrating the calculation content in the transmission diversity consideration CPCIH reception power calculation part shown in FIG. The figure which shows the relational characteristic of the reception power ratio and received SIR actual value for demonstrating the content which estimates the correct reception power ratio shown in FIG. 3 from the calculation value in the average calculating part shown in FIG. FIG. 3 shows a relational characteristic between a received power ratio and a measured received SIR value for explaining a process in which a base station phase control estimated value estimated by antenna verification shown in FIG. 1 is corrected in an antenna verification error correction unit; Figure FIG. 5 is a block diagram showing a configuration of an antenna verification error correction unit provided in the CDMA receiver according to Embodiment 2 of the present invention. FIG. 9 is a block diagram showing a configuration of an antenna verification error correction unit provided in the CDMA receiver according to Embodiment 3 of the present invention. The figure which shows the relational characteristic of reception power ratio and received SIR actual value for demonstrating operation | movement of the reception power ratio threshold value setting part and reception power ratio threshold value comparison determination part which are shown in FIG. FIG. 9 is a block diagram showing a configuration of an antenna verification error correction unit provided in a CDMA receiver according to Embodiment 4 of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100, CDMA receiver 101 Antenna 102 Reception RF part 103 AD converter 104a, 104b CPICH despreading part 105a, 105b DPCH despreading part 106a, 106b Desired channel despreading part 107a, 107 CPICH phase estimation part 108a, 108b DPCH phase estimation Unit 109 Antenna verification unit 110 SIR measurement unit 111, 600, 700, 900 Antenna verification error correction unit 112a, 112b Synchronous detection unit 113 Rake combining unit 114 Channel decoding unit 201, 602, 703 CPICH received power calculation unit 202 Desired channel received power calculation unit 203 Received power ratio calculation unit 204 Threshold setting unit 205, 601 Reception SIR threshold comparison determination unit 206 Average calculation unit 207, 902 Error correction unit 70 DESCRIPTION OF SYMBOLS 1 Reception power ratio threshold value comparison determination part 702 Reception power ratio threshold value setting part 901 Maximum value detection part

Claims (12)

A CDMA receiver having antenna verification means for estimating a base station phase control value in a transmission diversity of a desired channel such that a base station transmission power ratio between the CPICH and the desired channel is always constant. In
CPICH received power calculation for measuring CPICH received power based on a base station phase control value estimated by the antenna verification means as an antenna verification error correcting means for correcting an estimation result by the antenna verification means Means, received channel power calculating means for measuring received signal power of a desired channel, received power ratio calculating means for calculating a received power ratio between the CPICH received power and the desired channel received power, and the received power ratio. Reference reception power ratio estimation means for estimating the true reception power ratio, and the reception power ratio calculated using the other possible base station phase control value for the base station phase control value and the reception power ratio, The difference between the true received power ratio and the estimated received power ratio is compared, and the antenna verification CDMA receiver characterized by comprising an error correcting unit, the correcting errors of the estimated base station phase control value by tio emission means.   The reference received power ratio estimating means for estimating the true received power ratio includes a threshold setting means for setting a threshold, a received SIR threshold comparison determining means for comparing the threshold with the received SIR, and the received SIR is equal to or greater than the threshold. The average calculation means for calculating an average value of the received power ratio in the determined slot and outputting the average value to the error correction means as a true received power ratio is provided. CDMA receiver.   The reference reception power ratio estimation means for estimating the true reception power ratio includes a maximum value detection means for detecting a maximum value of the reception SIR, and a true reception power ratio in a slot where the reception SIR is detected to be maximum. The received power ratio is estimated as a true received power ratio between the received power ratio and the received power ratio, which is calculated using the other possible base station phase control value with respect to the base station phase control value. The CDMA receiver according to claim 1, further comprising: an error correction unit that compares a difference with a power ratio and corrects an error in a base station phase control value estimated by the antenna verification unit. .   The CPICH reception power calculation means and the reception power ratio calculation means are configured to calculate a reception power ratio using the other possible base station phase control value for a slot determined to be equal to or less than a threshold by the reception SIR threshold comparison determination means. 4. The CDMA receiving apparatus according to claim 2, wherein said error correcting means includes means for performing said correction processing only for a slot determined to be equal to or less than said threshold value.   A reception power ratio threshold setting means for setting a reception power ratio threshold; and a reception power ratio threshold comparison determination means for comparing the reception power ratio threshold with the reception power ratio, the CPICH reception power calculation means and the The reception power ratio calculation means comprises means for calculating the reception power ratio using the other possible base station phase control value only for the slot determined by the reception power ratio threshold determination means to be equal to or less than the threshold, 4. The CDMA receiving apparatus according to claim 2, wherein the error correction means also includes means for performing the correction processing only for a slot determined to be equal to or less than the threshold value. A CDMA receiver having an antenna verification process for estimating a base station phase control value during transmission diversity CL1 of a desired channel in which the base station transmission power ratio between the CPICH and the desired channel is always constant or constant In
CPICH received power calculation for measuring CPICH received power based on a base station phase control value estimated by the antenna verification means as an antenna verification error correcting step for correcting an estimation result obtained by the antenna verification step. A desired channel received power calculating means for measuring received signal power of a desired channel, a received power ratio calculating step for calculating a received power ratio between the CPICH received power and the desired channel received power, and the received power ratio. In a reference received power ratio estimation step for estimating a true received power ratio, and the received power ratio calculated using the other possible base station phase control value with respect to the base station phase control value, and the received power ratio, The difference between the true received power ratio and the estimated received power ratio is compared, and the antenna verification CDMA receiving method characterized by comprising the error correction step, a correcting errors of the estimated base station phase control value by tio emission means.   The reference received power ratio estimating step for estimating the true received power ratio includes a threshold setting step for setting a threshold, a received SIR threshold comparison determining step for comparing the threshold with a received SIR, and the received SIR is equal to or greater than the threshold. The CDMA according to claim 6, further comprising: an average calculation step of calculating an average value of the received power ratio in the determined slot and transferring the average value to the error correction step as a true received power ratio. Reception method.   The reference received power ratio estimating step for estimating the true received power ratio includes a maximum value detecting step for detecting a maximum value of the received SIR, and a received power ratio in a slot in which the received SIR is detected as a maximum. The received power ratio is estimated as a true received power ratio between the received power ratio and the received power ratio, which is calculated using the other possible base station phase control value with respect to the base station phase control value. 7. A CDMA reception method according to claim 6, further comprising: an error correction step of comparing a difference with a power ratio and correcting an error of a base station phase control value estimated by the antenna verification means. .   In the CPICH reception power calculation step and the reception power ratio calculation step, the calculation of the reception power ratio using the other possible base station phase control value is performed for the slot determined to be equal to or less than the threshold in the reception SIR threshold comparison determination step. 9. The CDMA receiving method according to claim 7, further comprising a step of performing only the correction processing for only a slot determined to be equal to or less than the threshold. .   A reception power ratio threshold setting step for setting a reception power ratio threshold; and a reception power ratio threshold comparison determination step for comparing the reception power ratio threshold with the reception power ratio, the CPICH reception power calculation step and the step The received power ratio calculating step includes means for calculating the received power ratio using the other possible base station phase control value only for the slot determined to be equal to or less than the threshold in the received power ratio threshold determining step, 9. The CDMA reception method according to claim 7, wherein the error correction means also includes a step of performing the correction processing only for a slot determined to be equal to or less than the threshold value.   A communication terminal apparatus comprising the CDMA receiver according to any one of claims 1 to 5. In a program comprising an antenna verification procedure for estimating a base station phase control value in transmission diversity of a desired channel such that the base station transmission power ratio between the CPICH and the desired channel is always constant or
CPICH received power calculation for measuring CPICH received power based on a base station phase control value estimated by the antenna verification procedure as an antenna verification error correction procedure for correcting an estimation result by the antenna verification procedure From a procedure, a received channel power calculation procedure for measuring a received signal power of a desired channel, a received power ratio calculation procedure for calculating a received power ratio between the CPICH received power and the desired channel received power, and the received power ratio In the reference received power ratio estimation procedure for estimating the true received power ratio, and the received power ratio calculated using the other possible base station phase control value with respect to the base station phase control value, and the received power ratio, The difference between the true received power ratio and the estimated received power ratio is compared, and the antenna verification Program characterized by comprising the error correction procedure, the to correct errors of the estimated base station phase control value by tio down procedure.

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