JP2005318432A - Apparatus and method for receiving diversity and radio communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diversity receiving apparatus, a diversity receiving method, and a radio communication apparatus to surely improve a diversity gain according to the reception situation of the diversity reception. <P>SOLUTION: A finger allocation controller 133 feedback-controls the allocation of fingers as for a first receiving signal and a second receiving signal in a pass detector 125 as a signal processing system so as for the diversity gain to improve based on a relation in size between a second threshold value and a ratio of the fingers which are different among branches input from a finger allocation comparator 131 and its difference in size, and the relation in size between a first threshold value and a reception level input from a level comparing portion 132 and its difference in size. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a diversity receiving apparatus, a diversity receiving method, and a wireless communication apparatus.

Conventionally, in a receiving apparatus that receives a diversity of radio signals by using a plurality of antenna elements, delay profiles are created from the received signals of the respective branches, and each of the timings corresponds to a path position detected based on the created delay profiles. A finger is assigned to the received signal (see, for example, Patent Document 1).
JP 2002-217779 A

  FIG. 8 shows a conventional diversity reception in which diversity reception is performed by HSDPA (High Speed Downlink Packet Access) in the W-CDMA system, a delay profile is created for each branch, and a finger is assigned to each received signal based on the delay profile. 3 is a block diagram showing a configuration of the device 10. FIG. The diversity receiving apparatus 10 includes antenna elements 11 and 21, reception processing units 12 and 22, despreading units 13 and 23, delay profile creation units 14 and 24, path detection units 15 and 25, level measurement units 16 and 26, and a demodulation unit. 17 and 27 and a CQI generator 28.

  The antenna elements 11 and 21 individually capture radio signals. The antenna element 11 inputs the received first reception signal to the reception processing unit 12, and the antenna element 21 inputs the received second reception signal to the reception processing unit 22.

  Each of the reception processing units 12 and 22 includes a band pass filter, an A / D converter, a low noise amplifier, and the like. The reception processing unit 12 performs a predetermined reception process on the first reception signal input from the antenna element 11 and then inputs the first reception signal to the despreading unit 13. Similarly, the reception processing unit 22 performs a predetermined reception process on the second reception signal input from the antenna element 21 and then inputs the second reception signal to the despreading unit 23.

  The despreading unit 13 performs despreading processing by multiplying the first reception signal input from the reception processing unit 12 by a predetermined spreading code, and the despreading first reception signal and first reception signal are obtained. This is input to the delay profile creation unit 14.

  Similarly, the despreading unit 23 performs despreading processing by multiplying the second reception signal input from the reception processing unit 22 by a predetermined spreading code, and performs the despreading second received signal and the second received signal. The received signal is input to the delay profile creation unit 24.

  The delay profile creation unit 14 creates a first delay profile for the despread first received signal input from the despreading unit 13, and passes the created first delay profile and the first received signal together. The data is input to the detection unit 15 and the path detection unit 25, respectively.

  Similarly, the delay profile creation unit 24 creates a second delay profile for the despread second received signal input from the despreading unit 23, and the created second delay profile and second received signal Are both input to the path detector 25.

  The path detection unit 15 observes a change in the power level with respect to the delay time of the first delay profile input from the delay profile creation unit 14, and when the power level continues above a predetermined threshold and exceeds a predetermined time, A finger is assigned to the first received signal at a delay time in which a peak of the power level exists within a predetermined time, that is, the timing of the detected path position, and first finger information that clearly indicates the assigned finger is generated. Then, the path detection unit 15 inputs both the first finger information and the first reception signal to the level measurement unit 16 and the demodulation unit 17, respectively. Here, the predetermined threshold is set based on a path position detected as a result of the previous path detection process and an average power of a delay profile excluding the vicinity thereof.

  Similarly to the path detection unit 15, the path detection unit 25 assigns fingers to the first received signal based on the first delay profile input from the delay profile creation unit 14, generates first finger information, and delays Based on the second delay profile input from the profile creation unit 24, a finger is assigned to the second received signal to generate second finger information. Then, the path detection unit 25 inputs the first finger information, the first reception signal, the second finger information, and the second reception signal to the level measurement unit 26 and the demodulation unit 27, respectively.

  Based on the first finger information input from the path detection unit 15, the level measurement unit 16 sets a finger at a timing corresponding to the detected path position, RAKE-combines the first received signal, and RAKE-combines. After calculating the reception level of the first reception signal, the calculated reception level of the first reception signal is input to a baseband unit (not shown).

  Similarly, the level measurement unit 26 sets a finger at a timing corresponding to the detected path position based on the two finger information input from the path detection unit 25, and the first reception signal and the second reception signal are set. And RAKE-combining and calculating the reception level of the combined reception signal generated by RAKE combining, and then inputting the calculated reception level of the combined reception signal to the CQI generation unit 28.

  Based on the finger information input from the path detector 15, the demodulator 17 sets a finger at a timing corresponding to the detected path position, RAKE-combines the first received signal, and RAKE-combined first The received signal is demodulated by a predetermined method and then input to a baseband unit (not shown).

  Similarly, the demodulation unit 27 sets a finger at a timing corresponding to the detected path position based on the two finger information input from the path detection unit 25, and the first reception signal and the second reception signal are set. And RAKE-combined, and a combined received signal generated by RAKE-combining is demodulated by a predetermined method and then input to a baseband unit (not shown).

  The CQI generation unit 28 calculates a SIR (Signal-to-Interference power Ratio) or the like of the combined received signal based on the reception level of the combined received signal input from the level measuring unit 26 to thereby obtain a CQI (Channel Quality Indicator). And the generated CQI is input to a transmission unit (not shown). The generated CQI is subjected to a predetermined transmission process by the transmission unit and then transmitted to the communication partner station.

  Therefore, in the diversity receiver 10, the path detector 25 automatically assigns fingers to the first received signal and the second received signal according to the predetermined setting condition, and further, the first received quality for the first received signal Since the second received quality of the combined received signal is not compared, in a reception situation unsuitable for diversity reception, for example, in a situation where the reception level of the received signal is significantly different between branches, the gain by diversity reception ( (Hereinafter referred to as “diversity gain”) is assumed, and when the propagation environment changes significantly, the detection or update of the path position is delayed and the diversity gain cannot be accommodated. It is also assumed that it cannot be obtained. For this reason, the diversity receiver 10 has a problem that the second reception quality of the combined received signal is not necessarily improved by diversity reception.

  The present invention has been made in view of such points, and an object of the present invention is to provide a diversity receiving device, a diversity receiving method, and a wireless communication device capable of reliably improving diversity gain according to the reception status of diversity reception. And

  A diversity receiving apparatus according to the present invention includes a first antenna element and a second antenna element that receive a radio signal, and a first reception quality measuring unit that measures a first reception quality of a first reception signal by the first antenna element. Second received quality measuring means for measuring a second received quality of a combined received signal obtained by combining the first received signal and the second received signal from the second antenna element; and the first received quality and the second received signal (2) Comparing means for comparing received quality, and control means for controlling a signal processing method for at least one of the first received signal and the second received signal based on a comparison result by the comparing means Take.

  According to this configuration, since the control unit adaptively controls the signal processing method for at least one of the first reception signal and the second reception signal based on the comparison result by the comparison unit, the diversity gain can be reliably improved. As a result, the second reception quality of the combined received signal can be improved.

  The diversity receiver according to the present invention, in the above invention, comprises: first path detection means for assigning a finger to the first received signal; second path detection means for assigning a finger to the second received signal; and the first received signal. Finger assignment comparing means for comparing the finger assigned to the second received signal and the finger assigned to the second received signal, wherein the control means compares the comparison result by the comparison means and the comparison result by the finger assignment comparison means. Based on the above, a configuration is adopted in which at least one of finger assignment for the first reception signal and finger assignment for the second reception signal is controlled.

  According to this configuration, in addition to the effects of the present invention, the control means performs the finger assignment for the first reception signal and the second reception signal based on the comparison result by the comparison means and the comparison result by the finger assignment comparison means. Since the feedback control is performed for at least one of the finger assignments, diversity gain can be improved reliably, and as a result, the second reception quality of the combined received signal of the first received signal and the second received signal after RAKE combining Can be improved.

  In the diversity receiving apparatus according to the present invention, in the invention, the control unit is configured to assign a finger to the first received signal based on a comparison result by the comparison unit and a comparison result by the finger assignment comparison unit, and the While controlling at least one of the finger assignments for the second received signal, the first threshold value used in the comparison means is adjusted based on the comparison result by the comparison means, and based on the comparison result by the finger assignment comparison means. The second threshold value used in the finger allocation comparing means is adjusted.

  According to this configuration, in addition to the effect of the invention, the first threshold value used in the comparison unit is adjusted based on the comparison result of the comparison unit, and is used in the finger allocation comparison unit based on the comparison result of the finger allocation comparison unit. Since the second threshold value to be adjusted is adjusted, the diversity gain can be reliably improved without increasing the circuit scale of the diversity receiver, and as a result, the second reception quality of the combined received signal can be improved. .

  The diversity receiver according to the present invention is the diversity receiver according to the present invention, wherein a first delay profile creating means for creating a first delay profile of the first received signal and a second delay for creating a second delay profile of the second received signal. Profile creating means, wherein the first path detecting means assigns a finger to the first received signal based on the first delay profile, and the second path detecting means is based on the second delay profile. Then, a finger is assigned to the second received signal, and the control means creates the first delay profile or the second delay profile based on the comparison result by the comparison means and the comparison result by the finger assignment comparison means. The structure which controls the average length at the time is taken.

  According to this configuration, in addition to the effect of the invention, the average when the control unit creates the first delay profile or the second delay profile based on the comparison result by the comparison unit and the comparison result by the finger assignment comparison unit. Since the fluctuation length of the noise can be reduced even when the noise included in the first reception signal or the second reception signal fluctuates instantaneously, the false detection of the delay profile peak can be reduced. it can.

  The diversity receiver according to the present invention is the diversity receiver according to the present invention, wherein a first delay profile creating means for creating a first delay profile of the first received signal and a second delay for creating a second delay profile of the second received signal. Profile creation means, and the first path detection means detects when the power level of the first delay profile at the path position detected based on the first delay profile is equal to or greater than a third threshold. A finger is assigned to the first received signal at a timing corresponding to the path position thus determined, and the second path detecting means is a power level of the second delay profile at the path position detected based on the second delay profile. Is greater than or equal to a fourth threshold value, the second received signal has a timing at a timing corresponding to the detected path position. The control means controls at least one of the third threshold used when assigning a finger to the first received signal and the fourth threshold used when assigning a finger to the second received signal. Take the configuration that is to be adjusted.

  According to this configuration, in addition to the effects of the invention, the feedback control by the control means is the third threshold used when assigning the finger to the first received signal and the fourth threshold used when assigning the finger to the second received signal. Since at least one of the threshold values is adjusted, the diversity gain can be improved without increasing the circuit scale of the diversity receiver, and as a result, the second reception quality of the combined received signal can be reliably improved. it can.

  In the diversity receiving apparatus according to the present invention, in the invention, the comparing means compares the first reception quality and the second reception quality to obtain a reception level of the first reception quality and the second reception quality. The control means calculates the difference for the first received signal based on the comparison result by the finger assignment comparing means only when the difference of the reception level calculated by the comparing means is less than the first threshold. A configuration is adopted in which at least one of finger assignment and finger assignment for the second received signal is controlled.

  According to this configuration, in addition to the effect according to the invention, the finger assignment comparing means only applies when the difference in reception level between the combined received signal calculated by the comparing means and the first received signal is less than the first threshold value. Based on the comparison result, the control means feedback-controls at least one of the finger assignment for the first received signal and the finger assignment for the second received signal, so that when the diversity gain is obtained, the finger assignment is performed. Since the current state is maintained, it is possible to reduce the load of reception processing in the diversity receiver and to obtain the diversity gain stably.

  In the diversity receiving apparatus according to the present invention, in the above invention, the finger assignment comparing means calculates a ratio of fingers that are different among branches in all fingers assigned to the first received signal and the second received signal. The control means only assigns the finger assignment for the first received signal and the finger assignment for the second received signal only when the ratio calculated by the finger assignment comparing means is greater than or equal to a second threshold value. A configuration is adopted in which at least one of them is controlled.

  According to this configuration, in addition to the effect of the present invention, the control means is provided only when the ratio of the fingers that differ among the branches in all the fingers calculated by the finger assignment comparison means is equal to or greater than the second threshold value. In order to feedback control at least one of the assignment of fingers for one received signal and the assignment of fingers for the second received signal, the possibility of improving the second received quality for the combined received signal by changing the finger assignment Since the finger assignment for the first reception signal or the second reception signal is changed only when the signal is high, the diversity gain is reliably improved while suppressing an increase in reception processing load in the diversity receiver. Can be made.

  The diversity receiver according to the present invention is the diversity receiver according to the present invention, wherein a first delay profile creating means for creating a first delay profile of the first received signal and a second delay for creating a second delay profile of the second received signal. Profile creation means, and the first path detection means detects when the power level of the first delay profile at the path position detected based on the first delay profile is equal to or greater than a third threshold. A finger is assigned to the first received signal at a timing corresponding to the path position thus determined, and the second path detecting means is a power level of the second delay profile at the path position detected based on the second delay profile. Is greater than or equal to a fourth threshold value, the second received signal has a timing at a timing corresponding to the detected path position. When the control means lowers the third threshold value used when assigning a finger to the first received signal based on the comparison result by the comparison means and the comparison result by the finger assignment comparison means, Further, the fourth threshold value used when assigning a finger to the second received signal is increased.

  According to this configuration, in addition to the effects of the invention, the third means used when the control means assigns the finger to the first received signal based on the comparison result by the comparison means and the comparison result by the finger assignment comparison means. As the threshold value is lowered, the fourth threshold value used when assigning fingers to the second received signal is raised, so that the number of fingers assigned to the first received signal increases and the number of fingers assigned to the second received signal decreases. Therefore, all fingers that can be assigned to the first received signal can be assigned to the combined received signal.

  The diversity receiver according to the present invention is the diversity receiver according to the present invention, wherein the control means includes the finger assigned to the first received signal and the first assignment based on the comparison result by the comparison means and the comparison result by the finger assignment comparison means. 2. A configuration is adopted in which the sum with the fingers allocated to the received signal is increased.

  According to this configuration, in addition to the effect of the present invention, the control means assigns to the first received signal and the second received signal based on the comparison result by the comparing means and the comparison result by the finger assignment comparing means. Therefore, diversity gain can be reliably improved while preventing waste of finger resources.

  The diversity receiver according to the present invention is the diversity receiver according to the present invention, wherein the MMSE combining means for performing MMSE combining on the first received signal and the second received signal, and the first received signal and the second received signal are performed. RAKE combining means for performing RAKE combining, and a switch for selecting either the MMSE combining means or the RAKE combining means and inputting the first received signal and the second received signal to the selected one. And the control means causes the switch to input the first received signal and the second received signal to either the MMSE combining means or the RAKE combining means based on the comparison result by the comparing means. Take the configuration.

  According to this configuration, in addition to the effects of the present invention, the control means uses either the MMSE combining means or the RAKE combining means as the input destination of the first received signal and the second received signal based on the comparison result by the comparing means. Therefore, a more preferable demodulation result can be obtained for the first received signal and the second received signal according to the second received quality after the combination.

  The diversity receiving apparatus according to the present invention employs a configuration in which, in the above invention, the control means intermittently operates the second reception quality measurement means based on a comparison result by the comparison means.

  According to this configuration, since the second reception quality measurement unit operates intermittently according to the second reception quality of the combined reception signal, it is possible to effectively reduce the power consumption of the diversity receiver. it can.

  The diversity reception method according to the present invention includes a reception step of receiving a radio signal by each of the first antenna element and the second antenna element, and a first reception quality of the first reception signal by the first antenna element. A first reception quality measurement step, a second reception quality measurement step of measuring a second reception quality of a combined reception signal obtained by combining the first reception signal and the second reception signal by the second antenna element, and the first A comparison step for comparing the reception quality with the second reception quality, and a control step for controlling a signal processing method for at least one of the first reception signal and the second reception signal based on the comparison result in the comparison step; It was made to comprise.

  According to this method, since the signal processing method for at least one of the first reception signal and the second reception signal in the control step is adaptively controlled based on the comparison result in the comparison step, the diversity gain is reliably improved. As a result, the second reception quality of the combined received signal can be improved.

  A wireless communication apparatus according to the present invention employs a configuration including the diversity receiving apparatus according to claim 1.

  According to this configuration, since the signal processing method for at least one of the first received signal and the second received signal is adaptively controlled by the diversity receiving apparatus provided, the diversity gain can be reliably improved. As a result, the second reception quality of the combined reception signal can be improved.

  According to the present invention, the first received quality for the first received signal and the second received quality for the combined received signal are compared, and based on the comparison result, the first received signal, the second received signal, or the combined received signal Since the signal processing method for the signal is controlled, the diversity gain can be reliably improved, and as a result, the second reception quality of the combined reception signal can be improved.

  The essence of the present invention is to compare the reception qualities of the received signals received with diversity between the branches and to change or adjust the signal processing method of the received signals received with diversity according to the comparison result.

  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 diversity receiving apparatus 100 according to Embodiment 1 of the present invention. Diversity receiving apparatus 100 is mounted and used in a mobile station apparatus such as a mobile phone constituting a wireless communication system, or a wireless communication apparatus such as a base station apparatus that performs wireless communication with this mobile station apparatus. In the present embodiment, it is assumed that diversity receiving apparatus 100 is mounted on the mobile station apparatus. The mobile station apparatus including the diversity receiving apparatus 100 performs diversity reception by the HSDPA (High Speed Downlink Packet Access) system in the W-CDMA system and is located in a cell (HSDPA serving cell) where the HSDPA service is provided. And

  Diversity receiving apparatus 100 includes antenna elements 111 and 121, reception processing units 112 and 122, despreading units 113 and 123, delay profile creation units 114 and 124, path detection units 115 and 125, level measurement units 116 and 126, and a demodulation unit. 117, 127, a CQI generation unit 128, a finger assignment comparison unit 131, a level comparison unit 132, and a finger assignment control unit 133.

  Each of the antenna elements 111 and 121 individually captures a radio signal. The antenna element 111 inputs the received first reception signal to the reception processing unit 112, and the antenna element 121 inputs the received second reception signal to the reception processing unit 122. Note that both the first received signal and the second received signal include the signal of the HSDPA serving cell (HSDPA signal).

  Each of the reception processing units 112 and 122 includes a band pass filter, an A / D converter, a low noise amplifier, and the like. The reception processing unit 112 performs predetermined reception processing on the first reception signal input from the antenna element 111 and then inputs the first reception signal to the despreading unit 113. Similarly, the reception processing unit 122 performs a predetermined reception process on the second reception signal input from the antenna element 121, and then inputs the second reception signal to the despreading unit 123.

  The despreading unit 113 performs despreading processing by multiplying the first reception signal input from the reception processing unit 112 by a predetermined spreading code, and the despreading first reception signal and first reception signal are obtained. This is input to the delay profile creation unit 114.

  Similarly, the despreading unit 123 performs despreading processing by multiplying the second reception signal input from the reception processing unit 122 by a predetermined spreading code, and performs the despreading second received signal and the second received signal. The received signal is input to the delay profile creation unit 124.

  The delay profile creation unit 114 creates a first delay profile based on the first reception signal input from the despreading unit 113, and the path detection unit 115 uses both the created first delay profile and the first reception signal. And the path detection unit 125 respectively.

  Similarly, the delay profile creation unit 124 creates a second delay profile based on the second received signal input from the despreading unit 123, and passes the created second delay profile and the second received signal together. Input to the detection unit 125.

  The path detection unit 115 observes a change in the power level with respect to the delay time of the first delay profile input from the delay profile creation unit 114, and when the power level is continuously greater than or equal to a third threshold for a predetermined time or more. Then, a finger is assigned to the first received signal at a timing corresponding to a delay time (detected path position) in which a peak of the power level is formed within the predetermined time, and first finger information is generated that clearly indicates the assigned finger. . Then, the path detection unit 115 inputs the generated first finger information and the first received signal to the level measurement unit 116, the demodulation unit 117, and the finger assignment comparison unit 131, respectively.

  Similarly, the path detection unit 125 generates the first finger information based on the first delay profile input from the delay profile creation unit 114 in the same manner as the path detection unit 115, and from the delay profile creation unit 124. Based on the input second delay profile, when the power level is continuously equal to or higher than the fourth threshold for a predetermined time or more, a finger is assigned to the second received signal at a timing corresponding to the detected path position. Second finger information is generated. Accordingly, the path detection unit 125 has a function exhibited by the path detection unit 115 and functions not only as a “second path detection unit” but also as a “first path detection unit”. Then, the path detection unit 125 inputs the first finger information, the first reception signal, the second finger information, and the second reception signal to the level measurement unit 126, the demodulation unit 127, and the finger assignment comparison unit 131, respectively.

  Based on the finger information input from the path detection unit 115, the level measurement unit 116 sets a finger for the first received signal at a timing corresponding to the detected path position, performs RAKE synthesis, and RAKE synthesis is performed. After calculating the reception level of the first reception signal, the calculated reception level of the first reception signal is input to the level comparison unit 132 and a baseband unit (not shown). Examples of the reception level of the first reception signal include CPICH (Common PIlot CHannel) RSCP (Received Signal Code Power), ISCP (Interference Signal Code Power), and SIR (RSCP / ISCP). Note that the reception level of the first reception signal input to the baseband unit is used for the neighbor cell search and the level measurement for reporting to the base station apparatus thereafter. Therefore, the level measurement unit 116 functions as “first reception quality measurement means” for measuring the first reception quality of the first reception signal.

  Similarly, the level measurement unit 126 sets a finger at a timing corresponding to the detected path position based on the two finger information input from the path detection unit 125, and receives the first reception signal and the second reception signal. And RAKE combining and calculating the reception level of the combined reception signal generated by RAKE combining, and then inputting the calculated reception level of the combined reception signal to the CQI generation unit 128 and the level comparison unit 132, respectively. Therefore, the level measuring unit 126 functions as “second reception quality measuring means” for measuring the second reception quality of the combined reception signal.

  Based on the finger information input from the path detector 115, the demodulator 117 RAKE-synthesizes the first received signal at the detected path position timing, and the RAKE-synthesized first received signal has a predetermined value. Demodulation processing is performed, and the demodulated first received signal is input to a baseband unit (not shown). Note that the demodulation unit 117 performs demodulation processing of the dedicated communication channel that does not require diversity reception.

  Similarly, the demodulation unit 127 sets a finger at a timing corresponding to the detected path position based on the two finger information input from the path detection unit 125, and sets the first reception signal and the second reception signal. Are combined with each other, and a combined received signal generated by the RAKE combining is input to a baseband unit (not shown). Note that the demodulation unit 127 performs demodulation processing of the HSDPA signal that requires diversity reception.

  The CQI generation unit 128 generates a CQI by calculating the SIR, Ec / N0, etc. of the combined reception signal based on the reception level of the combined reception signal input from the level measurement unit 126, and shows the generated CQI Do not input to the transmitter. The generated CQI is transmitted toward the base station apparatus after being subjected to a predetermined transmission process.

  The finger assignment comparing unit 131 uses information about the fingers assigned to the first received signal input from the path detecting unit 115 and information about the fingers assigned to the second received signal input from the path detecting unit 125. Compare and detect differences between branches for assigned fingers. More specifically, the finger assignment comparison unit 131 uses the path position detected based on the first delay profile as a reference, the path position detected based on the second delay profile as a reference, If there is something that can be recognized as the same, it is counted as the same finger, and if there is something that cannot be recognized as the same, for example, if there are more or less path positions than the reference path position, or the reference path position If the difference between the delay times is larger than a predetermined value, even the closest one is counted as a finger that is different between the branches. Then, the finger assignment comparison unit 131 calculates a ratio of fingers that differ between branches in all fingers assigned to the first received signal and the second received signal (the same finger is not counted twice). The finger allocation comparing unit 131 compares the calculated ratio of different fingers with a preset second threshold value, and compares the result, that is, the magnitude relationship between the calculated ratio and the second threshold value, and the difference between the magnitudes. Is input to the finger assignment control unit 133.

  The level comparison unit 132 calculates the difference between the reception level of the first reception signal input from the level measurement unit 116 and the reception level of the combined reception signal input from the level measurement unit 126, and the difference between the reception levels. And the first threshold value, and the information about the magnitude of the comparison result, that is, the difference between the calculated reception level and the first threshold value, and the magnitude of the magnitude difference is input to the finger assignment control unit 133.

  The finger allocation control unit 133 receives the magnitude relationship between the ratio of the fingers and the second threshold value that are different between the branches input from the finger allocation comparison unit 131 and the magnitude difference between the levels, and is input from the level comparison unit 132. The first received signal and the second received signal in the path detection unit 125 as a signal processing method so that the diversity gain is improved based on the magnitude relationship between the difference between the received levels and the first threshold and the magnitude of the magnitude difference. Feedback control of finger assignment for received signal is performed.

  Here, since the first reception quality measured by the level measurement unit 116 is used for handover control of the mobile station apparatus after being reported to the upper network of the base station apparatus, the measurement cycle may be 10 ms or more. Many. On the other hand, since the second reception quality measured by the level measuring unit 126 is used for CQI generation defined by the HSDPA method, the measurement cycle is often on the order of several ms. Therefore, the measurement of the second reception quality is often performed with a shorter measurement cycle and higher frequency than the measurement of the first reception quality. Therefore, the level comparison unit 132 is based on the measurement cycle of the first reception quality in the level measurement unit 116, and the second reception measured by the level measurement unit 126 at a timing closest to the timing at which the basic measurement cycle arrives. It is preferable to compare the quality with the first reception quality measured by the level measurement unit 116 corresponding to the quality.

  Next, in diversity receiving apparatus 100, the manner in which fingers are assigned to received signals based on a delay profile and a series of operations in which the finger assignment is feedback-controlled will be described in detail with reference to FIG. 2, FIG. 3, and FIG. Explained.

  FIG. 2 is a flowchart showing a series of operations in which the finger assignment control unit 133 feedback-controls the finger assignment in the path detection unit 125 as a signal processing method.

  In step ST210, the level comparison unit 132 calculates (reception level of the combined reception signal) / (reception level of the first reception signal) as the difference between the reception level of the first reception signal and the reception level of the combined reception signal. The ratio value is compared with the first threshold value, and the comparison result, that is, information about the magnitude relationship between the calculated ratio and the first threshold value and the magnitude of the magnitude difference is input to the finger assignment control unit 133. To do. In step ST210, based on the information input from the level comparison unit 132, the finger assignment control unit 133 determines that (the reception level of the combined reception signal) / (the reception level of the first reception signal) is the first threshold value. It is determined whether or not (for example, 1 dB) or more. In step ST210, when this determination result is affirmative, that is, when (the reception level of the combined reception signal) / (the reception level of the first reception signal) is equal to or higher than the first threshold value, the finger assignment control unit 133 It is determined that the diversity gain has already been obtained for the combined received signal, and the finger assignment in the path detection unit 125 is maintained as it is without being changed. On the other hand, if the determination result is negative in step ST210, that is, if (the reception level of the combined reception signal) / (the reception level of the first reception signal) is less than the first threshold value, the process continues to step ST210. Step ST220 is then executed.

  Subsequently, in step ST220, the finger assignment comparison unit 131 calculates the ratio of the fingers that are different among the branches occupying all the fingers assigned to the first received signal and the second received signal. The ratio of the different fingers and the second threshold are compared, and the comparison result, that is, the magnitude relationship between the ratio of the difference between the fingers and the second threshold between the branches, and information on the magnitude of the difference is assigned to the finger. Input to the controller 133. In step ST220, based on the information input from the finger assignment comparison unit 131, the finger assignment control unit 133 determines whether the ratio of fingers that differ between branches in all fingers is equal to or greater than the second threshold value. Determine whether or not. In step ST220, if this determination result is affirmative, that is, if the ratio of fingers that differ between branches in all fingers is greater than or equal to a second threshold (for example, 20%), step ST230 follows step ST220. Is executed. On the other hand, in step ST220, if the determination result is negative, that is, if the ratio of fingers that differ between branches in all fingers is less than a second threshold (for example, 20%), the first received signal The path position detected for the second received signal and the path position detected for the second received signal are often the same, and it is considered that there is little room to change the finger assignment for the first received signal and the second received signal. Therefore, even if the finger assignment is changed, it is difficult to expect an improvement in the diversity gain. Therefore, the finger assignment control unit 133 maintains the finger assignment in the path detection unit 125 without changing it.

  Subsequently, in step ST230, the second received quality for the combined received signal is greater than the first received quality for the first received signal, and the path position and the second received signal detected for the first received signal are determined. Therefore, it is possible to change the finger assignment for the first received signal and the second received signal, and expect to improve the diversity gain by changing this. Therefore, the finger assignment control unit 133 changes at least one of the finger assignment for the first reception signal and the finger assignment for the second reception signal in the path detection unit 125 as the signal processing method.

  FIG. 3A shows a finger assignment mode in the path detection unit 125 when the finger assignment control unit 133 reassigns a part of the fingers assigned to the second received signal by feedback control to the first received signal. In FIG. 3A, since both the first delay profile and the second delay profile are input to the path detection unit 125, these two delay profiles are shown together. FIG. 3B shows a finger assignment mode in the path detection unit 115. In FIGS. 3A and 3B, symbols “a” to “e” are respectively attached to path positions whose power levels are equal to or higher than the third threshold at the peak of the first delay profile. Further, in FIG. 3A, symbols “f” to “h” are respectively attached to path positions whose power levels are equal to or higher than the fourth threshold at the peak of the second delay profile. Here, the pass position a and the pass position f are recognized as the same, but the remaining pass positions b to e and the pass positions g to h cannot be determined to be the same. To do. In addition, the total finger resources that can be allocated to the first reception signal and the second reception signal by the path detection unit 125 are the same five as the path detection unit 115. Therefore, at the beginning of diversity reception, the path detection unit 125 assigns two finger resources at the path position a and the path position f for the first received signal and the second received signal with reference to the path position a and the path position f. The remaining three finger resources are sequentially allocated to the path position b, the path position g, and the path position c in descending order of the power levels of the first delay profile and the second delay profile. Here, since the path position a and the path position f are the same, and the path position b, the path position c, and the path position g are all different, the total number of fingers assigned to the first received signal and the second received signal is 5 Therefore, since there are three fingers that differ between branches, the proportion of fingers that differ between branches in all fingers is 60%.

  The difference between the second reception quality for the combined reception signal and the first reception quality for the first reception signal, that is, the value of (reception level of the combined reception signal) / (reception level of the first reception signal) is the level comparison unit. The ratio (60%) of the fingers that is less than the first threshold (eg, 1 dB) used in 132 and is different among the branches in all the fingers is the second threshold (eg, 20%) used in the finger assignment comparison unit 131. ) If so, the finger assignment control unit 133 performs feedback control such that the path detection unit 125 lowers the third threshold and raises the fourth threshold. Since the fourth threshold value is raised by this feedback control, the finger assigned to the second received signal is first canceled at the timing corresponding to the path position g. Subsequently, since the third threshold value is lowered, the two canceled fingers are newly assigned to the first received signal at the timing corresponding to the path position e.

  Therefore, in the finger assignment mode in the path detection unit 125 shown in FIG. 3A, the total number of fingers assigned to the combined received signal does not change, and the third threshold value used when assigning fingers to the first received signal, By adjusting the fourth threshold value used when assigning fingers to two received signals, the path position to which finger resources are assigned is changed. Therefore, with the embodiment shown in FIG. 3A, the diversity gain can be reliably improved without increasing the circuit scale of the diversity receiver, and as a result, the second reception quality of the combined received signal can be improved. . 3A, since fingers are assigned to all the path positions detected for the first received signal by feedback control by the finger assignment control unit 133, for example, compared with the first received signal. Even when the reception level of the second reception signal is extremely low or suddenly changes suddenly, the reception level of the combined reception signal can be prevented from falling below at least the reception level of the first reception signal, and the diversity gain can be stabilized. Can be obtained.

  FIG. 4A shows a finger assignment mode in the path detection unit 125 when the finger assignment control unit 133 adds a finger to be assigned to the first reception signal by feedback control. 4A and 4B have many parts in common with FIG. 3A and FIG. 3B, description of such common parts is omitted, and only different parts will be described.

  In FIG. 4A, in the feedback control for the path detection unit 125 by the finger assignment control unit 133, it is assumed that the path detection unit 125 has an extra finger resource. Then, the finger assignment control unit 133 adds a finger assigned to the first received signal by lowering the third threshold used in the path detection unit 125 when assigning the finger for the first received signal.

  Therefore, according to the finger assignment mode in the path detection unit 125 shown in FIG. 4A, in the feedback control for the path detection unit 125 by the finger assignment control unit 133, the comparison result in the level comparison unit 132 and the finger assignment comparison unit 131 is obtained. Accordingly, since the total number of fingers allocated to the first received signal and the second received signal will change, if diversity gain is obtained, finger resources can be saved, and waste of finger resources is prevented, Diversity gain can be improved reliably.

  As described above, according to diversity receiving apparatus 100 according to the present embodiment, based on the comparison results by level comparison unit 132 and finger allocation comparison unit 131, finger allocation control unit 133 determines the allocation of fingers for the first received signal. Since the feedback control of the finger assignment for the second received signal is performed, the diversity gain can be reliably improved, and as a result, the second received quality for the combined received signal can be improved.

  Moreover, according to diversity receiving apparatus 100 according to the present embodiment, the finger is only received when the difference in reception level between the combined reception signal calculated by level comparison section 132 and the first reception signal is less than the first threshold. Based on the comparison result by the assignment comparison unit 131, the finger assignment control unit 133 feedback-controls at least one of the finger assignment for the first received signal and the finger assignment for the second received signal, so that a diversity gain is obtained. In this case, since the assignment of fingers is maintained as it is, the load of reception processing in the diversity receiver 100 can be reduced, and a diversity gain can be stably obtained.

  Also, according to diversity receiving apparatus 100 according to the present embodiment, only when the ratio of fingers that differ among branches calculated by finger assignment comparing unit 131 among the branches is equal to or greater than the second threshold value. Since the assignment control unit 133 feedback-controls at least one of finger assignment for the first received signal and finger assignment for the second received signal, the second reception quality for the combined received signal is changed by changing the finger assignment. Since the finger assignment is changed only when there is a high possibility of improving the diversity gain, it is possible to reliably improve the diversity gain while suppressing an increase in the load of the reception processing in the diversity receiver 100.

  Further, according to diversity receiving apparatus 100 according to the present embodiment, based on the comparison results by level comparison section 132 and finger assignment comparison section 131, finger assignment control section 133 is used when assigning a finger to the first received signal. In addition to lowering the third threshold value, the fourth threshold value used when assigning the finger to the second received signal is raised, so that the number of fingers assigned to the first received signal increases and assigned to the second received signal. Since the number of fingers is reduced, the fingers can be assigned to all the path positions detected for the first received signal.

  Note that diversity receiving apparatus 100 according to the present embodiment may be applied or modified as follows.

  In the present embodiment, the first received signal has a timing corresponding to the peak of the power level on condition that the power level of the first delay profile or the second delay profile exceeds the third threshold value or the fourth threshold value for a predetermined time continuously. Or although the case where a finger was allocated to the 2nd received signal was explained, the present invention is not limited to this case, and various finger allocation methods can be applied. For example, after assigning a finger, the reception level of the delay profile before and after the finger is measured, and if the measurement result is greater than the power level for the current finger, the finger may be reassigned. Further, for example, the time during which the power level of the first delay profile or the second delay profile continuously exceeds the third threshold value or the fourth threshold value may be adjusted.

  In the present embodiment, the case where the first finger information is input from the path detection unit 115 to the finger assignment comparison unit 131 has been described. However, the present invention is not limited to this case. For example, the path detection unit The first finger information may not be input from 115 to the finger assignment comparing unit 131. Even in this case, since the first finger information is input from the path detection unit 125 to the finger assignment comparison unit 131, the finger assignment comparison unit 131 does not impair the function exhibited in the present embodiment. .

  In the present embodiment, the case where the first threshold value used in the level comparison unit 132 is 1 dB and the second threshold value used in the finger assignment comparison unit 131 is 20% has been described. However, the present invention is not limited to this case. For example, the finger assignment control unit 133 determines whether the first threshold value and the finger assignment control unit 133 receive the first threshold value and the comparison result input from the level comparison unit 132 and the finger assignment comparison unit 131 to the finger assignment control unit 133. You may make it adjust a 2nd threshold value adaptively. In this way, it is possible to reliably improve the diversity gain without increasing the circuit scale of the diversity receiver, and as a result, it is possible to improve the second reception quality for the combined received signal.

  In this embodiment, the average when the finger assignment control unit 133 creates delay profiles for the delay profile creation units 114 and 124 according to the comparison results by the level comparison unit 132 and the finger assignment comparison unit 131. You may instruct to change the length. In this way, when the diversity gain is not obtained for the combined received signal, the path length following the propagation path fluctuation can be detected by shortening the averaging length when creating the second delay profile. it can. Furthermore, in this case, the time when the power level of the first delay profile or the second delay profile continuously exceeds the third threshold value or the fourth threshold value may be adjusted.

  In the present embodiment, the finger assignment control in the path detection unit 125 has been described by adjusting the third threshold value or the fourth threshold value. However, the present invention is not limited to this case. The assignment of fingers to two received signals may be the same as the assignment to the first received signal. In this way, the delay time of the path does not change greatly between the antenna elements, so in the situation where diversity gain is not obtained, diversity gain is difficult to improve even if finger allocation is controlled, so this control is omitted. Can reduce the load of signal processing.

  In this embodiment, the case where the same third threshold value is applied to the first delay profile in the path detection units 115 and 125 has been described. However, the present invention is not limited to this case. Different threshold values may be applied to the first delay profile in the units 115 and 125, respectively. In this way, since a threshold more suitable for diversity reception can be applied in the path detection unit 125, it is easier to obtain diversity gain for the combined received signal.

(Embodiment 2)
FIG. 5 is a block diagram showing a configuration of diversity receiving apparatus 500 according to Embodiment 2 of the present invention. Diversity receiving apparatus 500 is the same as diversity receiving apparatus 100 except that finger allocation comparing section 131 is removed, switching control section 531 is replaced with finger allocation control section 133, switching section 532 is replaced with demodulating section 127, MMSE combining section 533, and so on. A RAKE combining unit 534 is provided. Therefore, most of the constituent elements of the diversity receiving apparatus 500 exhibit the same functions as the constituent elements of the diversity receiving apparatus 100. Therefore, in the present embodiment, the description of the components of diversity receiver 500 that perform the same functions as those of diversity receiver 100 is omitted to avoid duplication.

  The switching control unit 531 determines that the difference between the reception levels is the first based on the magnitude relationship between the above-described difference between the reception levels input from the level comparison unit 132 and the first threshold and the magnitude of the magnitude difference. If it is equal to or greater than the threshold value, it is determined that the diversity gain has already been obtained. On the other hand, if the difference between the reception levels is less than the first threshold value, it is determined that the diversity gain has not been obtained. When the switching control unit 531 determines that the diversity gain has already been obtained, the first reception signal and the second reception signal input from the path detection unit 125 to the switch 532 are input to the RAKE combining unit 534. The switch 532 is controlled so as to be input. On the other hand, if the switching control unit 531 determines that the diversity gain is not obtained, the first reception signal and the second reception signal input from the path detection unit 125 to the switch 532 are input to the MMSE synthesis unit 533. The switch 532 is controlled so as to be input.

  The switch 532 inputs the first reception signal and the second reception signal input from the path detection unit 125 to either the MMSE combining unit 533 or the RAKE combining unit 534 according to the control command from the switching control unit 531. .

  The MMSE combining unit 533 performs MMSE combining on the first received signal and the second received signal input from the switch 532, and inputs the combined received signal generated by the MMSE combining to a baseband unit (not shown).

  The RAKE combining unit 534 performs RAKE combining on the first received signal and the second received signal input from the switch 532, and inputs the combined received signal generated by RAKE combining to a baseband unit (not shown).

  Here, MMSE (Minimum Mean Square Error) combining is a signal processing method that improves reception quality by equalizing multipath interference, and has a higher reception processing load than RAKE combining, but is superior to reception performance.

  Therefore, according to diversity receiving apparatus 500 according to the present embodiment, when the switching control unit 531 determines that the diversity gain has not been obtained, MMSE combining is performed on the first received signal and the second received signal. The switching control unit 531 controls the switch 532 so that the diversity gain that cannot be obtained by the RAKE combining can be obtained. When the switching control unit 531 determines that the diversity gain has already been obtained, the switching control unit 531 switches the switch so that RAKE synthesis is performed on the first received signal and the second received signal. By controlling 532, it is possible to reduce the load of reception processing in diversity receiving apparatus 500.

(Embodiment 3)
FIG. 6 is a block diagram showing a configuration of diversity receiving apparatus 600 according to Embodiment 3 of the present invention. Diversity receiving apparatus 600 is the same as diversity receiving apparatus 100 except that finger assignment comparison unit 131 is removed and reception processing control unit 631 is provided instead of finger assignment control unit 133. Therefore, most of the constituent elements of the diversity receiving apparatus 600 exhibit the same functions as the constituent elements of the diversity receiving apparatus 100. Therefore, in the present embodiment, the description of the components of diversity reception device 600 that exhibits the same functions as the components of diversity reception device 100 is omitted to avoid duplication.

  The reception processing control unit 631 determines the difference between the reception levels based on the magnitude relationship between the difference between the reception level and the first threshold input from the level comparison unit 132 and the magnitude of the magnitude difference. If it is greater than or equal to one threshold, it is determined that the diversity gain has already been obtained. On the other hand, if the difference between the reception levels is less than the first threshold, it is determined that the diversity gain has not been obtained. Then, the reception processing control unit 631 controls the reception processing unit 122 to operate intermittently only when it is determined that the diversity gain is not obtained. Since the second received signal is not input to the despreading unit 123 and the delay profile creation unit 124 while the reception processing unit 122 operates intermittently, the despreading unit 123 and the delay profile creation unit 124 are also automatically intermittent. Will work. When the second received signal is not input to the path detecting unit 125 due to the intermittent operation of the delay profile creating unit 124, the CQI generating unit 128 detects the signal of the first received signal measured by the level measuring unit 126. The CQI is generated based on the level.

  Therefore, according to diversity receiving apparatus 600 according to the present embodiment, reception processing section 122, despreading section 123 and delay profile creating section 124 operate intermittently while diversity gain is not obtained. It is possible to reduce power consumption by diversity receiving apparatus 600 without degrading quality.

(Embodiment 4)
FIG. 7 is a block diagram showing a configuration of diversity receiving apparatus 700 according to Embodiment 4 of the present invention. Diversity receiving apparatus 700 is different from diversity receiving apparatus 100 in that delay profile creating section 114 and path detecting section 115 are removed, delay profile creating section 724 is replaced by delay profile creating section 124, and path detecting section 125 is replaced by a path. A detection unit 725 is provided. That is, the delay profile creation unit 724 in the diversity receiving apparatus 700 is an integration of the delay profile creation units 114 and 124, and similarly, the path detection unit 725 is an integration of the path detection units 115 and 125. Therefore, most of the constituent elements of the diversity receiving apparatus 700 exhibit the same functions as the constituent elements of the diversity receiving apparatus 100. Therefore, in the present embodiment, the description of the components of the diversity receiving device 700 that exhibits the same functions as the components of the diversity receiving device 100 is omitted to avoid duplication.

  The delay profile creation unit 724 creates a first delay profile based on the first received signal subjected to the despreading process input from the despreading unit 113 and performs the despreading process input from the despreading unit 123. A second delay profile is created based on the second received signal, and the created first delay profile and second delay profile are input to the path detection unit 725 together with the first received signal and the second received signal.

  The path detection unit 725 observes a change in the power level with respect to the delay time of the first delay profile input from the delay profile creation unit 724, and when the power level is continuously greater than or equal to the third threshold for a predetermined time or more. Then, a finger is assigned to the first received signal at a timing corresponding to a delay time (detected path position) in which a peak of the power level is formed within the predetermined time, and first finger information is generated that clearly indicates the assigned finger. . Then, the path detection unit 725 inputs the generated first finger information and the first reception signal to the level measurement unit 116 and the demodulation unit 117, respectively. Further, the path detection unit 725 detects the path position detected when the power level is continuously greater than or equal to the fourth threshold for a predetermined time or more based on the second delay profile input from the delay profile creation unit 724. The second finger information is generated by assigning a finger to the second received signal at a timing corresponding to. Then, the path detection unit 725 inputs the first finger information, the first received signal, the second finger information, and the second received signal to the level measuring unit 126, the demodulating unit 127, and the finger assignment comparing unit 131, respectively.

  Therefore, according to diversity receiving apparatus 700 according to the present embodiment, delay profile creating section 724 and path detecting section 725 are shared by two branches, so that the circuit scale of diversity receiving apparatus 700 can be reduced.

  The diversity receiving apparatus and diversity receiving method according to the present invention have the effect that a diversity gain can be obtained even if the propagation environment changes significantly. It is useful as a wireless communication device such as a base station device that performs wireless communication with the device.

The block diagram which shows the structure of the diversity receiver which concerns on Embodiment 1 of this invention. FIG. 3 is a flowchart showing a diversity reception method according to Embodiment 1 of the present invention; The figure which shows the aspect which allocates a finger to a received signal based on the delay profile in Embodiment 1. FIG. The figure which shows the aspect which allocates a finger to a received signal based on the delay profile in Embodiment 1. FIG. Block diagram showing the configuration of a diversity receiver according to Embodiment 2 of the present invention Block diagram showing a configuration of a diversity receiver according to Embodiment 3 of the present invention Block diagram showing the configuration of a diversity receiver according to Embodiment 4 of the present invention The block diagram which shows the structure of the conventional diversity receiver

Explanation of symbols

100, 500, 600 Diversity receiver 111, 121 Antenna element 112, 122 Reception processing unit 113, 123 Despreading unit 114, 124, 724 Delay profile creation unit 115, 125, 725 Path detection unit 116, 126 Level measurement unit 117, 127 Demodulation unit 131 Finger allocation comparison unit 132 Level comparison unit 133 Finger allocation control unit 531 Switching control unit 532 Switch 533 MMSE combining unit 534 RAKE combining unit 631 Reception processing control unit

Claims (13)

A first antenna element and a second antenna element for receiving a radio signal;
First reception quality measuring means for measuring a first reception quality of a first reception signal by the first antenna element;
Second reception quality measuring means for measuring a second reception quality of a combined reception signal obtained by combining the first reception signal and the second reception signal by the second antenna element;
Comparison means for comparing the first reception quality and the second reception quality;
A diversity receiving apparatus comprising: control means for controlling a signal processing method for at least one of the first received signal and the second received signal based on a comparison result by the comparing means. First path detecting means for assigning a finger to the first received signal;
Second path detecting means for assigning a finger to the second received signal;
Finger assignment comparing means for comparing a finger assigned to the first received signal with a finger assigned to the second received signal;
The control means determines at least one of finger assignment for the first received signal and finger assignment for the second received signal based on the comparison result by the comparison means and the comparison result by the finger assignment comparison means. The diversity receiver according to claim 1, wherein the diversity receiver is controlled. The control means determines at least one of finger assignment for the first received signal and finger assignment for the second received signal based on the comparison result by the comparison means and the comparison result by the finger assignment comparison means. With control,
Adjusting a first threshold value used in the comparison means based on a comparison result by the comparison means, and adjusting a second threshold value used in the finger assignment comparison means based on a comparison result by the finger assignment comparison means. The diversity receiver according to claim 2, wherein: First delay profile creating means for creating a first delay profile of the first received signal;
Second delay profile creating means for creating a second delay profile of the second received signal,
The first path detecting means assigns a finger to the first received signal based on the first delay profile;
The second path detecting means assigns a finger to the second received signal based on the second delay profile;
The control means controls an average length when creating the first delay profile or the second delay profile based on a comparison result by the comparison means and a comparison result by the finger assignment comparison means; The diversity receiver according to claim 2, wherein: First delay profile creating means for creating a first delay profile of the first received signal;
Second delay profile creating means for creating a second delay profile of the second received signal,
The first path detection means is a timing corresponding to the detected path position when the power level of the first delay profile at the path position detected based on the first delay profile is greater than or equal to a third threshold. To assign a finger to the first received signal,
The second path detection means is a timing corresponding to the detected path position when the power level of the second delay profile at the path position detected based on the second delay profile is greater than or equal to a fourth threshold value. To assign a finger to the second received signal,
The control in the control means adjusts at least one of the third threshold used when assigning a finger to the first received signal and the fourth threshold used when assigning a finger to the second received signal. The diversity receiver according to claim 2, wherein: The comparing means compares the first reception quality with the second reception quality to calculate a difference in reception level between the first reception quality and the second reception quality;
The control means, only when the difference in reception level calculated by the comparison means is less than a first threshold value, based on the comparison result by the finger assignment comparison means, 3. The diversity receiver according to claim 2, wherein at least one of finger assignment for the second received signal is controlled. The finger assignment comparison means calculates a ratio of fingers that differ between branches in all fingers assigned to the first received signal and the second received signal,
The control means is at least one of finger assignment for the first received signal and finger assignment for the second received signal only when the ratio calculated by the finger assignment comparing means is greater than or equal to a second threshold. The diversity receiver according to claim 6, wherein the diversity receiver is controlled. First delay profile creating means for creating a first delay profile of the first received signal;
Second delay profile creating means for creating a second delay profile of the second received signal,
The first path detection means is a timing corresponding to the detected path position when the power level of the first delay profile at the path position detected based on the first delay profile is greater than or equal to a third threshold. To assign a finger to the first received signal,
The second path detection means is a timing corresponding to the detected path position when the power level of the second delay profile at the path position detected based on the second delay profile is greater than or equal to a fourth threshold value. To assign a finger to the second received signal,
The control means lowers the third threshold value used when assigning a finger to the first received signal based on the comparison result by the comparison means and the comparison result by the finger assignment comparison means, and at the same time, 3. The diversity receiving apparatus according to claim 2, wherein the fourth threshold value used when assigning fingers to two received signals is raised.   The control means increases the sum of the fingers assigned to the first received signal and the fingers assigned to the second received signal based on the comparison result by the comparing means and the comparison result by the finger assignment comparing means. The diversity receiver according to claim 2. MMSE combining means for performing MMSE combining on the first received signal and the second received signal;
RAKE combining means for performing RAKE combining on the first received signal and the second received signal;
A switch that selects either the MMSE combining unit or the RAKE combining unit, and inputs the first received signal and the second received signal to the selected one, and
The control means causes the switch to input the first received signal and the second received signal to either the MMSE combining means or the RAKE combining means based on the comparison result by the comparing means. The diversity receiver according to claim 1, wherein:   The diversity receiving apparatus according to claim 1, wherein the control means intermittently operates the second reception quality measuring means based on a comparison result by the comparing means. A receiving step of receiving radio signals by the first antenna element and the second antenna element, respectively;
A first reception quality measuring step of measuring a first reception quality of a first reception signal by the first antenna element;
A second reception quality measuring step of measuring a second reception quality of a combined received signal obtained by combining the first received signal and the second received signal by the second antenna element;
A comparison step of comparing the first reception quality and the second reception quality;
And a control step of controlling a signal processing method for at least one of the first reception signal and the second reception signal based on a comparison result in the comparison step.   A radio communication apparatus comprising the diversity receiving apparatus according to claim 1.

Images