JP4332015B2 - Diversity receiver - Google Patents

Description

The present invention relates a base station apparatus for performing the mobile communication terminal device and the mobile communication terminal apparatus and radio communication such as mobile phones, the diversity reception equipment available to all devices which perform wireless communication.

  In wireless communication, as a technology to suppress radio signal degradation due to fading, propagation loss, etc., analog-to-digital conversion of signals received at each receiving system using multiple receiving systems with equivalent functions and corresponding antenna elements A diversity reception technique is known that synthesizes digital data generated by using the maximum ratio so that the CNR (Carrier to Noise Ratio) is maximized (see, for example, Patent Document 1).

  FIG. 7 is a block diagram showing an example of a configuration of a conventional diversity receiving apparatus to which diversity receiving technology is applied. The diversity receiver 10 shown in FIG. 7 includes two antenna elements (hereinafter abbreviated as “antennas”) 11, 12, two receiving units 13, 14, a power supply unit 15, a power supply control unit 16, and two switch units 17, 18 Note that the number of antennas and the number of reception units may be any number as long as it is two or more. Also, description of components such as an amplifier and a filter that are not directly involved in diversity reception will be omitted.

  Radio signals received by the antennas 11 and 12 are input to the receiving units 13 and 14, respectively. In the reception units 13 and 14, the radio signals are converted into baseband signals and input to a baseband signal processing unit (not shown). The power supply unit 15 supplies power to the receiving units 13 and 14 via the switch units 17 and 18, respectively. The power supply control unit 16 controls the on / off state of power supply to the receiving units 13 and 14 by switching on and off the switch units 17 and 18.

The control by the power supply control unit 16 turns on the switch units 17 and 18 so that diversity reception can be performed when high quality reception such as high-speed data transmission is required, for example, according to an instruction from the baseband signal processing unit. Then, the power supply to the receiving units 13 and 14 is turned on. On the other hand, when low power consumption is required, such as in a standby state of a mobile phone, the power of either one of the receiving units 13 and 14 is turned off.
JP-A-6-284062

  However, the conventional diversity receiver has the following problems. That is, since the diversity receiving apparatus 10 uses the two receiving units 13 and 14 having the same function, the problem is that the power consumption at the time of diversity reception is doubled as compared with the case where no diversity reception is performed. There is.

The present invention has been made in view of the foregoing, and an object thereof is to provide a diversity receiving equipment capable of reducing power consumption.

The diversity receiver of the present invention includes a plurality of antenna elements that receive radio signals, a first reception processing unit that performs a reception process on radio signals received by one antenna element of the plurality of antenna elements, Second reception processing means for performing reception processing with limited processing performance as compared to reception processing performed by the first reception processing means on radio signals received by other antenna elements of the plurality of antenna elements; the plurality of antenna measurement means for measuring a reception state of the predetermined antenna elements of the element, at least one on / off the power supply to one of the first reception processing unit and the second receiving processing unit, measuring Power supply control means for controlling according to the received state.

The diversity receiver of the present invention includes a plurality of antenna elements that receive radio signals, a first reception processing unit that performs a reception process on radio signals received by one antenna element of the plurality of antenna elements, Second reception processing means for performing reception processing with limited processing performance as compared to reception processing performed by the first reception processing means on radio signals received by other antenna elements of the plurality of antenna elements; On / off of power supply to the second reception processing means while fixing the power supply to the first reception processing means and the measurement means for measuring the reception state of the predetermined antenna elements of the plurality of antenna elements And a power supply control means for switching according to the measured reception state.

The diversity receiver of the present invention performs reception processing on a plurality of antenna elements that receive radio signals and a radio signal that is connected to one antenna element of the plurality of antenna elements and is received by the connected antenna elements. First reception processing means for performing the reception processing performed by the first reception processing means for a radio signal connected to the other antenna elements of the plurality of antenna elements and received by the connected antenna elements. Second reception processing means for performing reception processing with limited processing performance, measurement means for measuring reception states of predetermined antenna elements of the plurality of antenna elements, the plurality of antenna elements, and the first or second The antenna switching control means for switching the connection relationship between the two reception processing means according to the measured reception state is adopted.

The power control method of the present invention includes a plurality of antenna elements, first reception processing means for performing a reception process on a radio signal received by one antenna element of the plurality of antenna elements, and the plurality of antenna elements. Diversity reception comprising: a second reception processing unit configured to perform a reception process with limited processing performance compared to a reception process performed by the first reception processing unit with respect to a radio signal received by another antenna element A power control method for an apparatus, comprising: a measurement step of measuring a reception state of a predetermined antenna element of the plurality of antenna elements; and power supply to at least one of the first reception processing means and the second reception processing means And a power control step for controlling the on / off state according to the measured reception state.

The power control method of the present invention includes a plurality of antenna elements, first reception processing means for performing a reception process on a radio signal received by one antenna element of the plurality of antenna elements, and the plurality of antenna elements. Diversity reception comprising: a second reception processing unit configured to perform a reception process with limited processing performance compared to a reception process performed by the first reception processing unit with respect to a radio signal received by another antenna element A power control method in an apparatus, comprising: a measuring step for measuring reception states of predetermined antenna elements of the plurality of antenna elements; and the second reception process while fixing power supply to the first reception processing means on A power control step of switching on / off of power supply to the means in accordance with the measured reception state.

According to the antenna switching control method of the present invention, a plurality of antenna elements and a first reception that is connected to one antenna element of the plurality of antenna elements and performs a reception process on a radio signal received by the connected antenna elements. Processing performance compared to the reception processing performed by the first reception processing means for a radio signal connected to the other antenna elements of the plurality of antenna elements and received by the connected antenna elements A diversity reception apparatus having a second reception processing means for performing a limited reception process, a measurement step of measuring a reception state of a predetermined antenna element of the plurality of antenna elements, and Switching the connection relationship between a plurality of antenna elements and the first or second reception processing means according to the measured reception state And antenna switching control step, and to have.

  As described above, according to the present invention, power consumption can be reduced.

  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 diversity receiving apparatus according to Embodiment 1 of the present invention.

  A diversity receiving apparatus 100 shown in FIG. 1 includes two antennas 101 and 102, a standard function type reception processing unit 103, a function restriction type reception processing unit 104, a power source unit 105, a power source control unit 106, two switch units 107 and 108, A baseband signal processing unit 109, an RSSI measurement unit 110, and a determination unit 112 are included.

  Note that the number of antennas and the number of reception systems may be any number as long as it is two or more. Also, description of components such as an amplifier and a filter that are not directly involved in diversity reception will be omitted.

  The antennas 101 and 102 receive radio signals, respectively.

  The standard function type reception processing unit 103 performs predetermined reception processing including frequency conversion, analog-digital conversion, automatic gain control, and the like on an input radio signal (in this embodiment, a radio signal received by the antenna 101). To output a baseband signal of a predetermined level.

  The function-restricted reception processing unit 104 performs predetermined reception processing including frequency conversion, analog-digital conversion, automatic gain control, and the like on an input radio signal (in this embodiment, a radio signal received by the antenna 102). To output a baseband signal of a predetermined level. In the function-restricted reception processing unit 104, the EVM characteristic is relaxed compared to the standard function-type reception processing unit 103 (in other words, the numerical value indicating the EVM characteristic is higher than that of the standard function-type reception processing unit 103). Therefore, the range of the reception level in which the reception process can be executed is limited as compared with the standard function type reception processing unit 103. For this reason, the function-restricted reception processing unit 104 is lower in cost and power consumption than the standard function-type reception processing unit 103. Here, the EVM characteristic is a kind of index indicating the degree of distortion of the output signal with respect to the input signal. In the function-restricted reception processing unit 104 in which the EVM characteristic is relaxed, a reception level at which reception processing can be performed. Also, the reception sensitivity point (hereinafter referred to as “sensitivity point”), which is a boundary between reception levels that cannot be executed, is higher than that of the standard function type reception processing unit 103.

  Note that a reception processing unit whose filter performance is relaxed so that the reception process can be executed in an environment where the influence of the interference wave is small may be used as the function-restricted reception processing unit. In this case, a low-cost and low-power consumption reception processing unit can be realized by operating the function-restricted reception processing unit under the condition that the influence of the interference wave is small.

  The power supply unit 105 supplies power to the standard function type reception processing unit 103 via the switch unit 107 and to the function limited type reception processing unit 104 via the switch unit 108.

  The baseband signal processing unit 109 performs predetermined baseband signal processing on the baseband signal from the standard function type reception processing unit 103 or the function limited type reception processing unit 104 and outputs a demodulated signal at the time of non-diversity reception. To do. At the time of diversity reception, predetermined baseband signal processing is performed on the baseband signals from the standard function reception processing unit 103 and the function restriction type reception processing unit 104, and diversity combining processing such as maximum ratio combining is performed, for example, Output demodulated signal.

  In addition, the baseband signal processing unit 109 outputs a signal (hereinafter referred to as “high quality reception request”) indicating that high quality reception such as high speed data transmission is requested to the power supply control unit 106.

  The RSSI measurement unit 110 is one of indexes indicating a reception state from a baseband signal (in this embodiment, corresponding to a radio signal received by the antenna 101) subjected to reception processing by the standard function reception processing unit 103. The RSSI is measured.

  The determination unit 112 determines whether or not the measured RSSI is equal to or higher than the sensitivity point of the function-restricted reception processing unit 104, and outputs a signal corresponding to the determination result to the power supply control unit 106.

  The power supply control unit 106 turns on / off the switch units 107 and 108 according to whether or not a high-quality reception request is received from the baseband signal processing unit 109 and according to a signal from the determination unit 112. By switching, the on / off state of at least one of the standard function type reception processing unit 103 and the function restriction type reception processing unit 104 is switched, that is, the power on / off is controlled.

  For example, when the reception processing unit 104 can perform reception processing, that is, when the measured RSSI exceeds the sensitivity point of the function limitation type reception processing unit 104 and a high quality reception request is received, the switch units 107 and 108 The power supply to both the standard function type reception processing unit 103 and the function restriction type reception processing unit 104 is turned on. Also, for example, if the function-restricted reception processing unit 104 cannot perform reception processing, that is, if the measured RSSI is less than the sensitivity point of the function-restricted reception processing unit 104, whether or not a high-quality reception request has been received. Regardless, the power supply to the standard function type reception processing unit 103 is turned on, and the power supply to the function restriction type reception processing unit 104 is turned off.

  As described above, when high-quality reception is required, whether the power supply to the function-restricted reception processing unit 104 is in an on / off state depends on whether or not the conditions are such that the function-restricted reception processing unit 104 can perform reception processing. Since the control is performed, it is possible to achieve both improvement in reception performance by diversity reception and realization of low power consumption and low cost.

  Further, the power supply control unit 106 turns on / off in accordance with whether or not the condition (reception state) allows the reception processing to be performed by the function-restricted reception processing unit 104 even when the high-quality reception request is not received. You may switch off. For example, when the measured RSSI is equal to or higher than the sensitivity point of the function-restricted reception processing unit 104, the power supply to the function-restricted reception processing unit 104 is turned on and the power supply to the standard function-type reception processing unit 103 is turned off. To. On the other hand, if not, the power supply to the function limited reception processing unit 104 is turned off, and the power supply to the standard function type reception processing unit 103 is turned on.

  As described above, even when high-quality reception is not required, the power supply on / off state for the function-restricted reception processing unit 104 depends on whether or not the conditions are such that the function-restricted reception processing unit 104 can perform reception processing. Therefore, the reception process can be performed in a mode of lower power consumption and lower cost than the case of reception by the normal standard function type reception processing unit 103.

  Next, an example of the power control operation of the standard function type reception processing unit 103 and the function restriction type reception processing unit 104 in the diversity reception device 100 having the above configuration will be described. FIG. 2 is a flowchart for explaining a power supply control operation in diversity receiver 100.

  Here, a case will be described as an example where the power of the standard function type reception processing unit 103 is turned on regardless of whether high-quality reception is necessary or not.

  First, the power supply control unit 106 determines whether or not high quality reception is necessary based on whether or not a high quality reception request has been received (S1000). If the result of this determination is that high-quality reception is not required (S1000: NO), the function-restricted reception processing unit 104 is turned off (S1100). On the other hand, if high quality reception is required (S1000: YES), the process proceeds to step S1200.

  Then, the RSSI measurement unit 110 measures the RSSI of the radio signal received by the antenna 101 (S1200). In step S1400, the determination unit 112 determines whether the RSSI is equal to or higher than the sensitivity point of the function-restricted reception processing unit 104. As a result of the determination, if the RSSI is equal to or higher than the sensitivity point (S1400: YES), the function-restricted reception processing unit 104 is turned on (S1500). On the other hand, if the RSSI is not equal to or higher than the sensitivity point (S1400: NO), the process proceeds to step S1100.

  In the above case, the RSSI measurement is performed in the reception system on the standard function reception processing unit 103 side. However, if the RSSI measurement can be performed in the reception system on the function limited reception processing unit 104 side, both receptions are performed. The RSSI may be measured in the system. This is because the standard function type reception processing unit 103 and the function restriction type reception processing unit 104 have different antennas corresponding to each other and have characteristic differences with each other, and therefore, the RSSI measurement value may be different. . Therefore, for more accuracy, not only the RSSI measurement is performed in the reception system on the standard function reception processing unit 103 side, but also the RSSI measurement is performed by temporarily turning on the power of the function limited reception processing unit 104. May be.

  As described above, according to the present embodiment, the function-restricted reception processing unit 104 that performs the reception processing with the EVM characteristics relaxed as compared with the reception processing performed by the standard functional reception processing unit 103 is provided and measured. Since it is determined whether the RSSI is equal to or higher than the sensitivity point, and the on / off state of the power supply to the function-restricted reception processing unit 104 is switched based on the determination result, the reception performance is improved and low due to diversity reception. Both power consumption and low cost can be achieved.

  In the present embodiment, the case where the number of antennas and the number of reception systems are two has been described, but the present invention is not limited to this case, and the required reception quality and power consumption, You may increase those numbers suitably according to components cost. It is clear that the essential operations of the power supply unit 105 and the power supply control unit 106 are the same even when the number of antennas and the number of reception systems are increased.

  Moreover, the diversity receiver 100 described in the present embodiment is a base station that performs wireless communication with a mobile communication terminal device such as a mobile phone or a wireless LAN mobile terminal device, or with such a mobile communication terminal device. It can be incorporated in all wireless communication devices such as devices and access points.

(Embodiment 2)
FIG. 3 is a block diagram showing the configuration of the diversity receiving apparatus according to Embodiment 2 of the present invention. Note that the diversity receiver described in the present embodiment has the same basic configuration as that of the diversity receiver 100 described in the first embodiment, and the same components are denoted by the same reference numerals. Detailed description thereof will be omitted.

  A diversity receiving apparatus 200 shown in FIG. 3 includes a function-restricted reception processing unit 201 and a determination unit 202 in place of the function-restricted reception processing unit 104 and the determination unit 112 in the diversity receiving apparatus 100, and includes a gain value calculation unit 203. Furthermore, it has a configuration added.

  The function-restricted reception processing unit 201 performs predetermined reception processing including frequency conversion, analog-digital conversion, automatic gain control, and the like on an input wireless signal (in this embodiment, a wireless signal received by the antenna 102). To output a baseband signal of a predetermined level. In the function-restricted reception processing unit 201, the range of reception levels in which reception processing can be executed is limited compared to the standard function-type reception processing unit 103, that is, the EVM characteristics are standard function-type reception processing. Compared with the unit 103, it is relaxed and the dynamic range is limited. For this reason, the function-restricted reception processing unit 201 is lower in cost and lower in power consumption than the standard function-type reception processing unit 103.

  In this embodiment, a reception processing unit whose EVM characteristics are relaxed and whose dynamic range is limited is used as the function-restricted reception processing unit 201. However, a reception processing unit that only relaxes the EVM characteristics is used. Even when used as the function-restricted reception processing unit 201, it is possible to achieve the same operational effects as those of the diversity reception device 200 described in the present embodiment. Further, even if a reception processing unit whose dynamic range is only limited is used as the function-restricted reception processing unit 201, the same operational effects as those of the diversity reception device 200 described in the present embodiment can be realized. .

  Based on the measured RSSI, the gain value calculation unit 203 calculates a gain value that converges when the power supply to the function-restricted reception processing unit 201 is turned on. Reception processing units such as the standard function type reception processing unit 103 and the function limited type reception processing unit 201 generally include a circuit for performing automatic gain control, and gain so that the level of the baseband signal becomes an appropriate level. Therefore, the gain value can be calculated based on the measured value of RSSI.

  The determination unit 202 performs the same operation as the determination unit 112 described in the first embodiment, and whether or not the gain value calculated by the gain value calculation unit 203 is within the dynamic range of the function-restricted reception processing unit 201. And a signal corresponding to the determination result is output to the power supply control unit 106.

  The power supply control unit 106 turns on / off the switch units 107 and 108 according to whether or not a high quality reception request is received from the baseband signal processing unit 109 and according to a signal from the determination unit 202. By switching, the on / off state of at least one of the standard function type reception processing unit 103 and the function restriction type reception processing unit 201 is switched, that is, the power on / off is controlled.

  For example, the conditions under which the function-restricted reception processing unit 201 can perform reception processing, that is, the measured RSSI is equal to or higher than the sensitivity point of the function-restricted reception processing unit 201, and the calculated gain value is When the high-quality reception request is received within the dynamic range, the switch units 107 and 108 are turned on, and the power supply to both the standard function type reception processing unit 103 and the function restriction type reception processing unit 201 is turned on. Further, for example, a condition in which reception processing cannot be performed by the function-restricted reception processing unit 201, that is, when the measured RSSI is not equal to or higher than the sensitivity point of the function-restricted reception processing unit 201 or the calculated gain value is the function-restricted reception. If not within the dynamic range of the processing unit 201, regardless of whether or not a high-quality reception request has been received, the power supply to the standard function type reception processing unit 103 is turned on and the power supply to the function limited type reception processing unit 201 is made. Is turned off.

  As described above, when high-quality reception is required, whether the power supply to the function-restricted reception processing unit 201 is in an on / off state depends on whether or not the conditions are such that the function-restricted reception processing unit 201 can perform reception processing. Since the control is performed, it is possible to further improve the effect of achieving both improvement in reception performance by diversity reception and realization of low power consumption and low cost.

  Further, the power supply control unit 106 turns on / off according to whether or not the condition (reception state) allows the reception processing to be performed by the function-restricted reception processing unit 201 even when the high-quality reception request is not received. You may switch off. For example, when the measured RSSI is equal to or higher than the sensitivity point of the function-restricted reception processing unit 201 and the calculated gain value is within the dynamic range of the function-restricted reception processing unit 201, The power supply is turned on, and the power supply to the standard function type reception processing unit 103 is turned off. On the other hand, if not, the power supply to the function restriction type reception processing unit 201 is turned off, and the power supply to the standard function type reception processing unit 103 is turned on.

  As described above, even when high-quality reception is not required, the power supply on / off state for the function-restricted reception processing unit 201 depends on whether or not the conditions are such that the function-restricted reception processing unit 201 can perform reception processing. Therefore, it is possible to further promote the reduction in power consumption and cost than in the case of reception by the normal standard function reception processing unit 103.

  Next, an example of the power control operation of the standard function type reception processing unit 103 and the function restriction type reception processing unit 201 in the diversity reception device 200 having the above configuration will be described. FIG. 4 is a flowchart for explaining a power supply control operation in diversity receiver 200.

  Here, a case will be described as an example where the power of the standard function type reception processing unit 103 is turned on regardless of whether high-quality reception is necessary or not.

  In steps S1000 to S1200, the same operation as that in the first embodiment is executed. Subsequent to step S1200, in step S1300, a gain value is calculated based on the measured RSSI. In step S1400, it is determined whether the measured RSSI is equal to or higher than the sensitivity point of the function-restricted reception processing unit 201. If it is determined that the RSSI is equal to or higher than the sensitivity point (S1400: YES), the process proceeds to step S1450. If the RSSI is less than the sensitivity point (S1400: NO), the process proceeds to step S1100. In step S1450, it is determined whether the calculated gain value is within the dynamic range of function-restricted reception processing unit 201. As a result of the determination, if the gain value is within the dynamic range (S1450: YES), the process proceeds to step S1500 described in the first embodiment, and if the gain value is not within the dynamic range (S1450: NO), the process proceeds to step S1100.

  In the above case, the RSSI measurement is performed in the reception system on the standard function type reception processing unit 103 side. However, if the RSSI measurement can be performed in the reception system on the function limited reception processing unit 201 side, both receptions are performed. The RSSI may be measured in the system. This is because the standard function type reception processing unit 103 and the function restriction type reception processing unit 201 have different antennas corresponding to each other and have characteristic differences with each other, and therefore, the RSSI measurement values may be different. . Therefore, for more accuracy, not only the RSSI measurement is performed in the reception system on the standard function reception processing unit 103 side, but also the RSSI measurement is performed by temporarily turning on the power of the function limited reception processing unit 201. May be.

  As described above, according to the present embodiment, the function-restricted reception processing unit 201 that performs reception processing with a relaxed EVM characteristic than the reception processing performed by the standard function reception processing unit 103 is provided and measured. Diversity reception is performed in order to determine whether the RSSI is equal to or higher than the sensitivity point of the function-restricted reception processing unit 201 and to switch on / off the power supply to the function-restricted reception processing unit 201 based on the determination result. It is possible to achieve both improved reception performance and low power consumption and low cost.

  In the present embodiment, the case where the number of antennas and the number of reception systems are two has been described, but the present invention is not limited to this case, and the required reception quality and power consumption, You may increase those numbers suitably according to components cost. It is clear that the essential operations of the power supply unit 105 and the power supply control unit 106 are the same even when the number of antennas and the number of reception systems are increased.

  In the present embodiment, whether the RSSI measured by the RSSI measuring unit 110 is equal to or higher than the sensitivity point of the function-restricted reception processing unit 201, and the gain value calculated by the gain value calculating unit 203 is the function-restricted reception processing unit 201. However, it is possible to omit one of the determinations and make a one-step determination.

  The diversity receiving apparatus 200 described in the present embodiment is a base station that performs wireless communication with a mobile communication terminal apparatus such as a mobile phone or a wireless LAN mobile terminal apparatus or with such a mobile communication terminal apparatus. It can be incorporated in wireless communication devices such as devices and access points.

(Embodiment 3)
FIG. 5 is a block diagram showing the configuration of the diversity receiving apparatus according to Embodiment 3 of the present invention. Note that the diversity receiver described in the present embodiment has the same basic configuration as that of the diversity receiver 100 described in the first embodiment, and the same components are denoted by the same reference numerals. Detailed description thereof will be omitted.

  A diversity receiving apparatus 300 shown in FIG. 5 includes a determining unit 301 instead of the determining unit 112 of the diversity receiving apparatus 100, and includes an SNR measuring unit 302, an SNR comparing unit 303, an antenna switching control unit 304, and an antenna switching switch unit 305. Furthermore, it has a configuration added.

The RSSI measurement unit 110 performs the operation described in the first embodiment. However, in this embodiment, the standard function type reception processing unit 103 may be connected to the antenna 101 or may be connected to the antenna 102. Therefore, when the standard function type reception processing unit 103 is connected to the antenna 101, the RSSI (hereinafter referred to as “LEVEL ₁ ”) of the radio signal received by the antenna 101 is measured, and the standard function type reception processing unit 103 is connected to the antenna 101. When connected to 102, the RSSI (hereinafter referred to as “LEVEL ₂ ”) of the radio signal received by the antenna 102 is measured.

  The SNR measurement unit 302 measures the SNR (Signal to Noise Ratio) of the radio signal received by the antenna 101 and the SNR of the radio signal received by the antenna 102 based on the processing result in the baseband signal processing unit 109.

The SNR comparison unit 303 compares the SNR of the radio signal received by the antenna 101 (hereinafter referred to as “SNR ₁ ”) and the SNR of the radio signal received by the antenna 102 (hereinafter referred to as “SNR ₂ ”). The comparison result indicating the relationship is output to the determination unit 301.

The determination unit 301 determines whether LEVEL ₁ is equal to or higher than the sensitivity point of the function-restricted reception processing unit 104, determines whether LEVEL ₂ is higher than the sensitivity point of the function-restricted reception processing unit 104, and determines these And a signal corresponding to the comparison result input from the SNR comparison unit 303 is output to the power supply control unit 106 and the antenna switching control unit 304.

  The antenna switching control unit 304 controls the antenna switching switch unit 305 according to the signal input from the determination unit 301, that is, the antenna 101 and the antenna 102, the standard function type reception processing unit 103, and the function restriction type reception processing unit 104. Control to switch the connection relationship between the two. Details of this switching control will be described later.

  Next, an example of the switching control operation of the connection relationship between the antenna 101 and the antenna 102 and the standard function type reception processing unit 103 and the function restriction type reception processing unit 104 in the diversity receiving device 300 having the above configuration will be described. FIG. 6 is a flowchart for explaining the switching control operation in diversity receiver 300.

First, the antenna switching control unit 304 controls the antenna switching unit 305 to connect the antenna 101 and the standard function type reception processing unit 103 (S2000). Then, the RSSI (LEVEL ₁ ) of the radio signal received by the antenna 101 is measured by the RSSI measuring unit 110 (S2100). Then, the SNR measuring unit 302 measures SNR ₁ (S2200).

Subsequently, the antenna switching control unit 304 controls the antenna switching switch unit 305 to connect the antenna 102 and the standard function type reception processing unit 103 (S2300). Then, the RSSI (LEVEL ₂ ) of the radio signal received by the antenna 102 is measured by the RSSI measuring unit 110 (S2400). Then, the SNR measurement unit 302 measures SNR ₂ (S2500).

  Then, the power supply control unit 106 determines whether high quality reception is necessary based on whether a high quality reception request is received from the baseband signal processing unit 109, that is, whether diversity reception is necessary ( S2600). As a result of this determination, if diversity reception is necessary (S2600: YES), the process proceeds to step S2700. If diversity reception is not necessary (S2600: NO), the process proceeds to step S3100.

In step S <b> 2700, the determination unit 301 determines whether LEVEL ₁ is equal to or higher than the sensitivity point of the function-restricted reception processing unit 104. In the present embodiment, it is determined whether or not LEVEL ₁ is within the dynamic range of the function-restricted reception processing unit 104 (more than the allowable minimum reception power level MIN and less than the allowable maximum reception power MAX). As a result of the determination, if LEVEL ₁ is not less than the allowable minimum reception power level MIN and not more than the allowable maximum reception power MAX (S2700: YES), the process proceeds to step S2800. On the other hand, if not (S2700: NO), the process proceeds to step S3200.

In step S < _b > 2800, the determination unit 301 determines whether LEVEL ₂ is equal to or higher than the sensitivity point of the function-restricted reception processing unit 104. In the present embodiment, it is determined whether LEVEL ₂ is within the dynamic range of the function-restricted reception processing unit 104 (above the allowable minimum reception power level MIN and below the allowable maximum reception power MAX). As a result of the determination, if LEVEL ₂ is equal to or higher than the allowable minimum received power level MIN and equal to or lower than the allowable maximum received power MAX (S2800: YES), the process proceeds to step S2900. On the other hand, if not (S2800: NO), the process proceeds to step S3000.

In step S2900, SNR comparing section 303 compares SNR ₁ and SNR ₂ , and if the result of this comparison is that SNR ₁ is greater than or equal to SNR ₂ (S2900: YES), the process proceeds to step S3000, where SNR ₁ is SNR ₂ If smaller (S2900: NO), the process proceeds to step S3200.

  In step S3000, the antenna switching control unit 304 controls the antenna switching switch unit 305 to connect the antenna 101 and the function-restricted reception processing unit 104 and connect the antenna 102 and the standard function-type reception processing unit 103.

In step S <b> 3100, the determination unit 301 determines whether LEVEL ₁ is equal to or higher than the sensitivity point of the function-restricted reception processing unit 104. In the present embodiment, it is determined whether or not LEVEL ₁ is within the dynamic range of the function-restricted reception processing unit 104 (more than the allowable minimum reception power level MIN and less than the allowable maximum reception power MAX). As a result of the determination, if LEVEL ₁ is not less than the allowable minimum reception power level MIN and not more than the allowable maximum reception power MAX (S3100: YES), the process proceeds to step S3000. On the other hand, when that is not right (S3100: NO), it progresses to step S3200.

  In step S3200, the antenna switching control unit 304 controls the antenna switching switch unit 305 to connect the antenna 101 and the standard function type reception processing unit 103 and to connect the antenna 102 and the function limited type reception processing unit 104.

  By performing the switching control operation as described above, when diversity reception is not performed, the function-restricted reception processing unit 104 can search for a reception state antenna that can perform reception processing, and there is such an antenna. Can connect the antenna to the function-restricted reception processing unit 104 and perform reception processing in the function-restricted reception processing unit 104. On the other hand, if there is no such antenna, the standard function-type reception processing unit 103 The reception process can be performed. Furthermore, when performing diversity reception, it is possible to preferentially assign and connect a reception state antenna that can be received by the function-restricted reception processing unit 104 to the function-restricted reception processing unit 104, and therefore, the diversity gain is increased. It becomes easy to obtain.

  In the above switching control operation, diversity gain is obtained by preferentially allocating the antenna having the better SNR to the function-restricted reception processing unit 104, but the switching control operation is not limited to this. For example, if the antenna with the better SNR is preferentially assigned to the standard function reception processing unit 104, the signal with the best reception quality will affect the reception quality in diversity reception, and therefore the signal degradation will be reduced. It is possible to prevent signal degradation from occurring in the function-restricted reception processing unit 104 that has a relatively high possibility.

  As described above, according to the present embodiment, the function-restricted reception processing unit 104 that performs reception processing with EVM characteristics relaxed as compared with the reception processing performed by the standard function reception processing unit 103 includes a plurality of antennas. Each RSSI or SNR is measured, it is determined whether or not each measured RSSI is equal to or higher than the sensitivity point of the function-restricted reception processing unit 104, and each SNR is compared with each other to obtain a result of the determination and comparison. Based on this, the connection relationship between the antenna 101 and the antenna 102 and the standard function type reception processing unit 103 and the function restriction type reception processing unit 104 is switched, so that reception performance is improved by diversity reception and low power consumption and low cost are realized. Can be further enhanced.

  In addition, when the characteristic difference between the standard function type reception processing unit 103 and the function restriction type reception processing unit 104 is known, the RSSI of the antennas 101 and 102 is changed to the reception system on the standard function type reception processing unit 103 side. Measurement may be performed separately by the reception system on the function-restricted reception processing unit 104 side, and the characteristic difference may be corrected.

  The switching control operation is performed when data reception is not performed, for example, between reception operations.

  Further, in this embodiment, the case where the number of antennas and the number of reception systems are two has been described, but the present invention is not limited to this case, and the required reception quality and power consumption, You may increase those numbers suitably according to components cost. It is obvious that the essential operations of the power supply unit 105, the power supply control unit 106, and the antenna switching control unit 304 are the same even if the number of antennas and the number of reception systems are increased.

  The diversity receiver 300 described in the present embodiment is a base station that performs wireless communication with a mobile communication terminal device such as a mobile phone or a wireless LAN mobile terminal device, or with such a mobile communication terminal device. It can be incorporated in all wireless communication devices such as devices and access points.

Diversity reception equipment of the present invention has the effect of reducing the power consumption, the base station apparatus for performing the mobile communication terminal device and the mobile communication terminal apparatus and radio communication such as mobile phones perform wireless communication device Useful in general.

The block diagram which shows the structure of the diversity receiver which concerns on Embodiment 1 of this invention. Flow chart for explaining power supply control operation in the diversity receiver according to Embodiment 1 of the present invention. The block diagram which shows the structure of the diversity receiver which concerns on Embodiment 2 of this invention. Flow chart for explaining power supply control operation in the diversity receiver according to Embodiment 2 of the present invention. The block diagram which shows the structure of the diversity receiver which concerns on Embodiment 3 of this invention. Flow chart for explaining the switching control operation in the diversity receiver according to the third embodiment of the present invention. Block diagram showing an example of the configuration of a conventional diversity receiver

Explanation of symbols

100, 200, 300 Diversity receiving device 101, 102 Antenna 103 Standard function type reception processing unit 104, 201 Function limited type reception processing unit 105 Power source unit 106 Power source control unit 107, 108 Switch unit 109 Baseband signal processing unit 110 RSSI measurement unit 112, 202, 301 Determination unit 203 Gain value calculation unit 302 SNR measurement unit 303 SNR comparison unit 304 Antenna switching control unit 305 Antenna switching switch unit

Claims (6)

A plurality of antenna elements for receiving radio signals;
A first reception processing means for performing reception processing on a radio signal received by the first antenna element among the plurality of antenna elements;
Among the plurality of antenna elements , the reception level that can be executed for the radio signal received by the second antenna element is limited compared to the reception process performed by the first reception processing means . Second reception processing means for performing reception processing;
Measuring means for measuring a reception level of a predetermined antenna element of the plurality of antenna elements;
Power control means for switching on / off power supply to the first reception processing means and the second reception processing means,
The power control means turns on the power supply to the first reception processing means when high quality reception is required, and the measured reception level is equal to or higher than the executable reception level of the second reception processing means. When there is, the power supply to the second reception processing means is turned on. When the measured reception level is not higher than the executable reception level of the second reception processing means, the power supply to the second reception processing means is supplied. A diversity receiver characterized by being turned off . The power supply control means turns on the power supply to the second reception processing means when the measured reception level is equal to or higher than the reception level executable by the second reception processing means when high quality reception is not required. The diversity receiver according to claim 1, wherein power supply to the first reception processing unit is turned off. The said 2nd reception process means performs the reception process by which the EVM (Error Vector Magnitude) characteristic was eased compared with the reception process performed by the said 1st reception process means. Diversity receiver. The second reception processing means performs a reception process with a limited dynamic range as compared to the reception process performed by the first reception processing means,
Calculation means for calculating a gain value when power supply to the second reception processing means is turned on based on the reception level; and
The power control means turns on the power supply to the first reception processing means when high quality reception is necessary, and the reception level is equal to or higher than the executable reception level of the second reception processing means, And when the calculated gain value is within the dynamic range, the power supply to the second reception processing unit is turned on, and the reception level is not higher than the executable reception level of the second reception processing unit, or 4. The diversity receiver according to claim 3, wherein when the gain value is not within the dynamic range, power supply to the second reception processing unit is turned off. The measuring means measures a reception level of the first antenna element;
When high-quality reception is not necessary, when the reception level is equal to or higher than a reception level executable by the second reception processing means, the first antenna element is connected to the second reception processing means, and the second The diversity receiving apparatus according to claim 1, further comprising: a switching unit that switches the antenna element to be connected to the first reception processing unit. A plurality of antenna elements for receiving radio signals; first reception processing means for performing a reception process on a radio signal received by the first antenna element among the plurality of antenna elements; and a plurality of antenna elements Among these, the radio signal received by the second antenna element is subjected to reception processing in which the range of reception levels that can be executed is limited compared to the reception processing performed by the first reception processing means. A diversity reception apparatus power control method comprising: a second reception processing unit;
A measuring step of measuring a reception level of a predetermined antenna element of the plurality of antenna elements;
When high quality reception is required, the power supply to the first reception processing unit is turned on, and when the measured reception level is equal to or higher than the executable reception level of the second reception processing unit, the first 2 A power control step of turning on the power supply to the reception processing means and turning off the power supply to the second reception processing means when the measured reception level is not higher than the executable reception level of the second reception processing means. And a power supply control method.

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