JP2007116454A - Diversity receiver and reception method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diversity receiver capable of preventing the increase of power consumption. <P>SOLUTION: The diversity receiver includes a plurality of receiving branches for receiving communication signals, reception quality determination parts 109 and 110 for calculating branch reception qualities representing reception qualities of communication signals received by the reception branches, a synthesizing part 107 for synthesizing respective communication signals received by the reception branches, a reception quality determination part 111 for calculating a synthesized reception quality representing a reception quality of a synthesized signal synthesized by the synthesizing part 107; and a control part 112 for selecting a single branch reception system of receiving communication signals by one of reception branches or a diversity reception system of receiving communication signals by a plurality of reception branches out of the reception branches, on the basis of the branch reception qualities and the synthesized reception quality. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

  The configuration of a conventional diversity receiver is shown in FIG. FIG. 17 is a block diagram of a conventional diversity receiver. Diversity receiver 1700 includes first and second branches. The first branch demodulates the output signals of the first frequency converter 1702 and the first frequency converter 1702 that convert a received RF (Radio Frequency) signal from the first antenna 1701 into a baseband signal. Controls the power supply to the first baseband demodulation preprocessing unit 1703, the first antenna 1701, the first frequency conversion unit 1702, and the first baseband demodulation preprocessing unit 1703 that perform the first half of necessary signal processing. The first reception processing unit power control unit 1704 is provided.

  The second branch is necessary for demodulation of the output signals of the second frequency converter 1706 and the second frequency converter 1706 that convert the received RF signal from the second antenna 1705 into a baseband signal. A second baseband demodulation preprocessing unit 1707, a second antenna 1705, a second frequency conversion unit 1706, and a second baseband demodulation preprocessing unit 1707 for performing the first half of the signal processing are controlled. The reception processing unit power control unit 1708 is provided.

  The weighting synthesis processing unit 1709 performs weighting synthesis on the output signal of the first baseband demodulation preprocessing unit 1703 and the output signal of the second baseband demodulation preprocessing unit 1707. The baseband demodulation post-processing unit 1710 performs the latter half of the signal processing necessary for demodulation on the output signal of the weighting synthesis processing unit 1709. Further, the received signal quality detection processing unit 1711 that detects the quality of the output signal of the weighting synthesis processing unit 1709, and the information signal that decodes the information signal that is the compressed signal of the image and sound among the output signals of the post-baseband demodulation processing unit 1710 A control signal decoding unit 1713 is provided for decoding a control signal (TMCC information: Transmission and Multiplexing Configuration Control) that is a transmission system parameter among output signals of the decoding unit 1712 and the baseband demodulation post-processing unit 1710.

  The output signal of the information signal decoding unit 1712 is subjected to reproduction processing by the information signal reproduction processing unit 1714, and the video signal reproduced by the information signal reproduction processing unit 1714 is displayed on the display unit 1715. The power supply control to the information signal reproduction processing unit 1714 is performed by the information signal reproduction processing unit power supply control unit 1716, the power supply control to the display unit 1715 is performed by the display unit power supply control unit 1717, and the supply to the information signal decoding unit 12 is performed. Power control is performed by the information signal decoding unit power control unit 1718.

  FIG. 18 shows a reception method switching method in the reception apparatus having the above configuration. When the reception quality deteriorates and the error rate of the received control information exceeds a predetermined value, or when the reception quality improves and the error of the received signal falls below a predetermined value, the diversity reception is changed to Switch to reception and stop power supply to unused branches.

On the other hand, if the reception quality has improved and the error rate of the control signal has fallen below the predetermined value, or the reception quality has deteriorated and the error of the reception signal has exceeded the predetermined value, the branch has not been used. The power consumption can be reduced by restarting the power supply to the mobile phone and switching from single branch reception to diversity reception (see, for example, Patent Document 1).
JP-A 2004-320528 (page 1-3, FIG. 1)

  However, in such a conventional diversity receiving apparatus 1700, only the signal error after combining at the time of diversity reception is used as the determination condition when switching from diversity reception to single branch reception. Even in the absence of diversity, diversity reception is continued, resulting in an increase in power consumption. In such a diversity receiver 1700, for example, when a diversity receiver is configured with an extendable whip antenna and an earphone antenna, when the whip antenna is housed or when the earphone antenna is wound, one antenna is used. Therefore, the diversity gain cannot be obtained.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a diversity receiving apparatus and a diversity receiving method that can prevent an increase in power consumption.

  To achieve the above object, a first diversity receiver of the present invention calculates a plurality of reception branches that receive communication signals and branch reception quality that indicates the reception quality of the communication signals received by the reception branches. A branch reception quality determining unit; a combining unit that combines the communication signals received by the receiving branch; and a combined reception quality determining unit that calculates a combined reception quality indicating reception quality of the combined signal combined by the combining unit; A single-branch reception method for receiving the communication signal in any one of the reception branches based on the branch reception quality and the combined reception quality, or the communication in any one of the reception branches. And a control unit that selects any one of the diversity reception methods for receiving the signal.

  With this configuration, not only a combined signal at the time of diversity reception but also a reception signal by single branch reception is considered, and diversity reception is stopped when there is no diversity effect, so that power consumption can be reduced.

  Further, in the second diversity receiving apparatus of the present invention, the control unit has a reception state determination threshold value indicating a criterion for selecting the single branch reception method, and based on the branch reception quality and the reception state determination threshold value In this configuration, it is determined whether or not to select the single branch reception method.

  With this configuration, when the reception quality by single branch reception is better than the reception quality by diversity reception, single branch reception can be performed.

  Further, in the third diversity receiving apparatus of the present invention, the control unit receives the reception branch selection unit that selects any one of the reception branches, and the reception other than that selected by the reception branch selection unit. And an operation control unit that restricts the operation of the branch.

  With this configuration, it is possible to limit the operation of the non-receiving branch, such as stopping the power supply of the receiving branch other than the branch that is receiving at the time of single-branch reception.

  Also, in the fourth diversity receiving apparatus of the present invention, the control unit calculates a diversity effect determining unit that calculates a diversity effect value indicating a difference between the best received reception quality of the receiving branch and the combined received quality. And a diversity effect determination threshold value indicating a criterion for selecting the diversity reception method, and it is determined that the diversity effect value is smaller than the diversity effect determination threshold value, the single branch until a predetermined period elapses. The reception method is selected.

  With this configuration, at the time of diversity reception, if there is no effect of a certain level or more, the reception performance can be prevented from being deteriorated by performing diversity reception intermittently. In addition, once it is determined that the effect of diversity reception is small and the power of one of the branches is turned off, an increase in power consumption can be prevented by restricting the diversity reception for a certain period. .

  Further, the fifth diversity receiver of the present invention has a moving speed detector that detects the moving speed of the diversity receiver, and the control unit determines the reception state determination threshold based on the moving speed, At least one of the predetermined periods is set.

  With this configuration, since a switching determination value that takes into account the moving speed of the receiving apparatus can be used, appropriate switching can be performed even when the receiving apparatus is in a moving state. In addition, since the intermittent reception cycle is lengthened at low speeds and shortened at high speeds, an unnecessary diversity effect determination is not performed, so that an increase in power consumption can be prevented.

  Further, the sixth diversity receiver of the present invention is characterized in that the control unit has at least one of the reception state determination threshold and the predetermined period based on a state parameter indicating the moving speed and the state of the diversity receiver. One is set.

  With this configuration, it is possible to perform diversity reception suitable for the current environment and state of the diversity receiving apparatus, and thus it is possible to improve user convenience.

  In the seventh diversity receiver of the present invention, the controller sets the diversity effect determination threshold based on the state parameter.

  With this configuration, it is possible to perform diversity reception suitable for the current environment and state of the diversity receiving apparatus, and thus it is possible to improve user convenience.

  In the eighth diversity receiver according to the present invention, the state parameter includes at least one of a battery remaining amount, an application state, manual setting content, and automatic setting content of the diversity receiving device.

  With this configuration, it is possible to perform diversity reception suitable for the current environment and state of the diversity receiving apparatus, and thus it is possible to improve user convenience.

  Also, the first diversity reception method of the present invention shows a branch reception step in which the communication signal is received by a plurality of reception branches that receive the communication signal, and a reception quality of the communication signal received in the branch reception step. A step of calculating the branch reception quality, a combining step of combining the communication signals received in the branch receiving step, and a combined reception quality indicating the reception quality of the combined signal combined in the combining step are calculated. A single branch reception method in which the communication signal is received in any one of the reception branches based on the step, the branch reception quality and the combined reception quality, or any one of the reception branches Any of the diversity reception methods in which the communication signal is received in And the method having the steps to be-option.

  By this method, not only the composite signal at the time of diversity reception but also the reception signal by single branch reception is considered, and diversity reception is stopped when there is no diversity effect, so that power consumption can be reduced.

  The present invention can provide a diversity receiving apparatus and a diversity receiving method that can prevent an increase in power consumption.

Hereinafter, a receiving apparatus according to an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)

  A receiving apparatus 100 according to the first embodiment of the present invention will be described with reference to FIGS. First, the basic configuration will be described with reference to FIG. FIG. 1 is a block diagram of a receiving apparatus 100 according to the first embodiment of the present invention.

  The receiving apparatus 100 includes a first antenna 101, a second antenna 102, a first tuner 103, a second tuner 104, a first demodulator 105, a second demodulator 106, a combiner 107, and an error corrector. 108, a first reception quality determination unit 109, a second reception quality determination unit 110, a third reception quality determination unit 111, a control unit 112, a switch 113, and an operation control unit 114. The reception system having the first antenna 101, the first tuner 103, and the first demodulator 105 has the first branch, the second antenna 102, the second tuner 104, and the second demodulator 106. The reception system is the second branch. The receiving device 100 is, for example, a receiving terminal that receives a digitally modulated signal with diversity.

  Here, the synthesis unit 107 is an example of a synthesis unit. The first and second reception quality determination units 109 and 110 are examples of the branch reception quality determination unit. The third reception quality determination unit 111 is an example of a combined reception quality determination unit. The control unit 112 is an example of a control unit. The switch 113 is an example of a reception branch selection unit. The operation control unit 114 is an example of an operation control unit.

  The first and second antennas 101 and 102 receive digitally modulated signals. The first tuner 103 selects a desired channel from the digital modulation signal input to the first antenna 101. The second tuner 104 selects a desired channel from the digital modulation signal input to the second antenna 102. The first demodulator 105 demodulates the signal selected by the first tuner 103. The second demodulator 106 demodulates the signal selected by the second tuner 104. The combiner 107 combines the signal demodulated by the first demodulator 105 and the signal demodulated by the second demodulator 106.

  The error correction unit 108 performs error correction processing on the signal combined by the combining unit 107 and the signal of the first or second branch connected to the switch 113. First reception quality determination section 109 determines reception quality from the signal demodulated by first demodulation section 105. For the determination of the reception quality, for example, calculation of a carrier to noise ratio (hereinafter simply referred to as C / N) is used. Second reception quality determination section 110 determines reception quality from the signal demodulated by second demodulation section 106. Third reception quality determination section 111 determines reception quality from the signal combined by combining section 107.

  The control unit 112 controls the reception method based on the determination results obtained by the reception quality determination units 109, 110, and 111. The switch 113 is switched by the control unit 112 in order to perform each single branch reception and combined diversity reception. Here, single-branch reception is a reception system that receives a signal of only one of the first and second branches and calculates reception quality, and combined diversity reception is a signal in both the first and second branches. Is a reception method for calculating the reception quality of each. The operation control unit 114 controls the power sources of the first and second tuners 103 and 104, the first and second demodulation units 105 and 106, and the combining unit 107 based on the determination by the control unit 112.

Next, the configuration of the control unit 112 will be described in detail with reference to FIG. FIG. 2 is a detailed block diagram of the control unit 112 in the first embodiment of the present invention.
The control unit 112 includes a determination parameter storage unit 201, a diversity effect determination unit 202, and a reception method switching unit 203.
Here, the diversity effect determination unit 202 is an example of a diversity effect determination unit.

  The determination parameter storage unit 201 includes a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and stores in advance parameters such as an effect determination threshold and a reception state determination threshold necessary for control. Diversity effect determination means 202 determines whether or not there is a diversity effect from the reception quality values from reception quality determination sections 109, 110, and 111 and the effect determination threshold value recorded in determination parameter storage means 201. Then, the determination result is sent to the reception method switching means 203. The reception method switching means 203 is based on the reception quality values from the reception quality determination sections 109, 110, 111, the effect determination results from the diversity effect determination means 202, and the reception state determination threshold value recorded in the determination parameter storage means 201. Then, the reception system switching determination is performed. When it is determined that the switching is necessary, the power control command to the operation control unit 114 and the switch 113 are switched.

The operation of the receiving apparatus 100 configured as described above will be described with reference to FIGS.
First, the operation at the time of single branch reception will be described with reference to FIG. FIG. 3 is an operation flow diagram at the time of single-branch reception of the receiving apparatus 1 according to the first embodiment of the present invention.

  First, the reception quality determination unit 109 or 110 determines the reception quality of the branch currently being received (step S301). Next, the reception method switching unit 203 compares the obtained reception quality value with the reception state determination threshold value recorded in the determination parameter storage unit 201 (step S302). If the current reception quality is smaller than the high-level reception state determination threshold and larger than the low-level reception state determination threshold, it is determined that diversity reception is necessary, and step S303 is performed. If the current reception quality is equal to or higher than the high-level reception state determination threshold value or lower than the low-level reception state determination threshold value, it is determined that diversity reception is unnecessary, and the operation at the time of single branch reception is repeated as it is (step S306).

  If it is determined that diversity reception is necessary, the operation control unit 114 turns on the tuner 103 or 104, the demodulating unit 105 or 106, and the combining unit 107 of the currently unused branch (step S303). Next, the control unit 112 switches the switch 113 to perform diversity reception, and performs processing at the time of diversity reception shown in FIG. 4 (steps S304 and S305).

Next, the operation at the time of diversity reception will be described with reference to FIG. FIG. 4 is an operation flowchart for diversity reception by the receiving apparatus 100 according to the first embodiment of the present invention.
First, the reception quality determination units 109, 110, and 111 determine the first and second branches and the respective reception qualities after combining (step S401). Next, the reception method switching unit 203 compares the determined reception quality between the first branch and the second branch, and determines a branch with good reception quality (step S402).

  Next, the reception method switching unit 203 compares the reception quality value of the branch with good reception quality with the reception state determination threshold value recorded in the determination parameter storage unit 201 (step S403). If the reception quality of a branch with good reception quality is equal to or higher than the high-level reception state determination threshold or lower than the low-level reception state determination threshold, it is determined that diversity reception is unnecessary, and the reception quality of the branch with good reception quality is high-level reception state If it is smaller than the determination threshold and greater than the low level reception state determination threshold, it is determined that diversity reception is necessary.

  If it is determined that diversity reception is not necessary, the control unit 13 switches the switch 113 to a branch having good reception quality and performs single-branch reception (step S404). Next, the operation control unit 114 turns off the tuners 103 or 104 of the unused branches, the demodulation unit 105 or 106, and the combining unit 107 (step S405), and performs the processing at the time of single branch reception shown in FIG. (Step S406).

  On the other hand, if it is determined that diversity reception is necessary, the diversity effect determination means 202 calculates the difference between the reception quality of the branch with good reception quality and the reception quality after combining (hereinafter referred to as diversity effect) (step). S407). The diversity effect determination unit 202 compares the obtained diversity effect with the effect determination threshold value recorded in the determination parameter storage unit 201 (step S408). When the diversity effect is smaller than the effect determination threshold value, it is determined that there is no diversity reception effect, and when the diversity effect is equal to or greater than the effect determination threshold value, it is determined that the diversity reception effect is effective.

  If there is an effect of diversity reception, the process at the time of diversity reception is performed as it is (step S412). If there is no diversity effect, the control unit 112 switches the switch 113 to a branch with good reception quality and performs single branch reception (step S409). Next, the operation control unit 114 turns off the unused branches of the tuner 103 or 104, the demodulation unit 105 or 106, and the combining unit 107 (step S410), and performs the processing during intermittent reception shown in FIG. (Step S411).

Next, the operation at the time of intermittent reception will be described with reference to FIG. FIG. 5 is an operation flow diagram at the time of intermittent reception of the reception device 100 according to the first embodiment of the present invention.
First, the reception quality determination unit 109 or 110 determines the reception quality of the branch currently being received (step S501). Next, the reception method switching unit 203 compares the obtained reception quality with the reception state determination threshold value recorded in the determination parameter storage unit 201 (step S502). If the current reception quality is smaller than the high level reception state determination threshold and larger than the low level reception state determination threshold, step S503 is continued. If the current reception quality is equal to or higher than the high level reception state determination threshold value or equal to or lower than the low level reception state determination threshold value, it is determined that diversity reception is unnecessary, and the operation at the time of single branch reception shown in FIG. 3 is performed (step S507).

  Next, the reception method switching unit 203 determines whether or not the intermittent reception period recorded in the determination parameter storage unit 201 has elapsed (step S503). If not, the process returns to step S201. When the time has elapsed, the operation control unit 114 turns on the tuners 103 or 104, the demodulation unit 105 or 106, and the synthesis unit 107 of the currently unused branch (step S504). Next, the control unit 112 switches the switch 113 to perform the process at the time of diversity reception shown in FIG. 4 (steps S505 and S506).

  By performing intermittent reception as described above, once it is determined that the effect of diversity reception is small and the power of any branch is turned off, it is consumed by limiting the diversity reception for a certain period of time. An increase in power can be prevented.

Here, a specific example of switching of the reception method will be described with reference to FIG. FIG. 6 is a schematic diagram of reception method switching of the reception device 100 according to the first embodiment of the present invention.
First, α and β (where α> β) are two threshold values that are reception state determination threshold values, and the reception quality value of single branch reception by the first branch having the first antenna 101 is circled, The reception quality values for single branch reception by the second branch having the antenna 102 are indicated by square marks, and the reception quality values for diversity reception by the first and second antennas 101 and 102 are indicated by asterisks in the figure.

  At time T1, the first reception quality value of the first branch (here, C / N as an example) is acquired. When the acquired reception quality value is compared with the threshold values α and β, the first reception quality value ≧ α, so the processing is performed while receiving a single branch. The threshold values α and β are arbitrary values and can be changed depending on the reception quality. At time T2, the acquired first reception quality value is closer to the threshold value α than at time T1, but since the first reception quality value ≧ α, processing is performed while receiving a single branch.

  When time elapses and time T3 is reached, diversity reception is performed because the C / N value of the first branch satisfies threshold β <first reception quality value <threshold α. Comparing the acquired reception quality values of the first and second branches, the reception quality of the first branch is better, so the first reception quality value and the combined third reception quality value (diversity effect) ) Is calculated. In this case, since the diversity effect (the distance between the star and the circle in the figure) is large, the diversity reception is performed during the time T3 to T4.

  Next, at time T4, since the first reception quality value ≦ the threshold value β, the diversity reception is switched to the single branch reception. At time T5, again, threshold value β <first reception quality value <threshold value α, so diversity reception is performed. However, since the diversity effect is smaller than the effect determination threshold, the diversity reception is switched to the single branch reception.

In the first embodiment of the present invention, the case where the C / N value is used as the threshold value has been described. However, even when a parameter representing reception quality other than C / N such as a packet error or a bit error is used, Similar effects can be obtained.
Moreover, although it described that it switched to the branch with good reception quality in step S404, S409 of FIG. 4, you may switch to the one where the gain of an antenna is higher.
Further, when calculating reception quality or diversity effect determination, it may be calculated using an average value for a certain fixed time instead of an instantaneous value.

According to such a receiving apparatus 100 in the first embodiment of the present invention, a plurality of reception branches that receive communication signals and reception that calculates branch reception quality indicating the reception quality of the communication signals received by the reception branch. Quality determination sections 109 and 110, a combining section 107 that combines the communication signals received by the reception branch, and a reception quality determination section 111 that calculates a combined reception quality indicating the reception quality of the combined signal combined by the combining section 107. Based on the branch reception quality and the combined reception quality, the communication signal is received in any one of the reception branches, or the communication signal is received in any one of the reception branches. And a control unit 112 that selects one of the diversity reception methods. Not only the combined signal by the time of reception, the received signal by the single branch reception is also taken into consideration, if there is no diversity effect is to stop the diversity reception, it is possible to reduce power consumption.
(Second Embodiment)

  Next, a receiving apparatus 700 according to the second embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a block diagram of a receiving apparatus 700 according to the second embodiment of the present invention.

  The receiving device 700 includes a moving speed detection unit 702 in addition to the receiving device 100 according to the first embodiment of the present invention, and includes a control unit 701 instead of the control unit 112. The moving speed detection unit 702 detects the moving speed of the receiving device 700. In FIG. 7, portions that are the same as those of the receiving device 100 described in the first embodiment of the present invention are denoted by the same reference numerals, and description thereof is omitted. The receiving device 700 is, for example, a receiving terminal that receives a digitally modulated signal with diversity. The moving speed detector 702 is an example of a moving speed detector.

  Next, only the differences of the configuration of the control unit 701 from the control unit 112 in the first embodiment of the present invention will be described. FIG. 8 is a detailed block diagram of the control unit 701 in the second embodiment of the present invention. The control unit 701 includes an intermittent reception cycle setting unit 801 and a reception state determination threshold setting unit 802 in addition to the control unit 112 in the first embodiment of the present invention.

The intermittent reception cycle setting unit 801 sets an intermittent reception cycle at the time of intermittent reception based on the moving speed of the receiving device 700 detected by the moving speed detection unit 702 and records it in the determination parameter storage unit 201. The reception state determination threshold setting unit 802 sets a reception state determination threshold used for determination of reception method switching by the reception method switching unit 202 based on the moving speed, and records the reception state determination threshold in the determination parameter storage unit 201.

  The operation of the receiving apparatus 700 configured as described above will be described with reference to FIGS.

First, the operation at the time of single branch reception will be described with reference to FIG. FIG. 9 is an operation flowchart for single-branch reception of the receiving apparatus 700 according to the second embodiment of the present invention.
First, the moving speed detector 702 calculates the moving speed of the receiving device 700 by using a GPS (Global Positioning System) or a gyro sensor (step S901). Next, the reception state determination threshold value setting unit 802 obtains a reception state determination threshold value based on the calculated moving speed and sets it in the determination parameter storage unit 201 (step S902). The subsequent processing is the same as steps S301 to S306 in FIG.

Next, the operation at the time of diversity reception will be described with reference to FIG. FIG. 10 is an operation flowchart for diversity reception by the receiving apparatus 700 according to the second embodiment of the present invention.
First, the moving speed detection unit 702 calculates the moving speed of the receiving device 700 by using a GPS or a gyro sensor (step S1001). Next, the reception state determination threshold value setting unit 802 obtains a reception state determination threshold value based on the calculated moving speed, and sets it in the determination parameter storage unit 201 (step S1002). The subsequent processing is the same as steps S401 to S412 in FIG.

Next, the operation at the time of intermittent reception will be described with reference to FIG. FIG. 11 is an operation flow diagram at the time of intermittent reception of the reception device 700 according to the second embodiment of the present invention.
First, the moving speed detector 702 calculates the moving speed of the receiving device 700 by using a GPS or a gyro sensor (step S1101). Next, the reception state determination threshold value setting unit 802 obtains a reception state determination threshold value based on the calculated moving speed, and sets it in the determination parameter storage unit 201 (step S1102). Next, the intermittent reception cycle setting unit 801 obtains an intermittent reception cycle based on the calculated moving speed, and sets it in the determination parameter storage unit 201 (step S1103). The subsequent processing is the same as steps S501 to S507 in FIG.

  Here, the setting of the intermittent reception cycle and the reception state determination threshold based on the moving speed will be described. As the moving speed increases, the fading pitch becomes narrower and the state of the received signal level changes drastically. Therefore, a value that is inversely proportional to the moving speed is set for the intermittent reception period. Further, the required C / N value, which is the C / N value at the sensitivity point, is large at high speed and low speed, and relatively small at medium speed. Furthermore, since it becomes the smallest when stationary, a value that takes the required C / N value into consideration is set as the reception state determination threshold.

  For the intermittent reception cycle, a fading pitch may be obtained and the value may be set as the intermittent reception cycle. Further, the speed and the value of the intermittent reception cycle corresponding to the speed may be stored in the memory in advance as a table.

In addition, although it described that it switched to the branch with good reception quality in step S404, S409 of FIG. 10, you may switch to the one where the gain of an antenna is higher.
Further, when calculating reception quality or diversity effect determination, it may be calculated using an average value for a certain fixed time instead of an instantaneous value.

Further, the speed detection of the receiving device 700 may be performed at regular intervals instead of being performed every time. Accordingly, the setting of the intermittent reception cycle and the reception state determination threshold value may be performed at regular intervals.
Moreover, although the case where a sensor was used for the speed detection method was shown, not only this but what kind of method may be used.

According to the receiving apparatus 700 of the second embodiment of the present invention as described above, the receiving apparatus 700 includes the moving speed detection unit 702 that detects the moving speed of the receiving apparatus 700, and the control unit 701 receives the reception state based on the moving speed. By adopting a configuration in which at least one of the determination threshold value and the intermittent reception cycle is set, a switching determination value that takes into account the moving speed of the receiving device 700 can be used, so that even if the receiving device 700 is in a moving state. Appropriate switching can be performed, and an increase in power consumption can be prevented because the intermittent reception period is lengthened at low speeds and shortened at high speeds, so that no excessive diversity effect determination is performed.
(Third embodiment)

  Next, a receiving apparatus according to the third embodiment of the present invention will be described with reference to FIGS. FIG. 12 is a block diagram of a receiving device 1200 according to the third embodiment of the present invention.

  The receiving device 1200 includes a state determination unit 52 in addition to the receiving device 1200 according to the second embodiment of the present invention, and includes a control unit 1201 instead of the control unit 701. The state determination unit 52 determines the state of the reception device 1200, such as the remaining battery level of the reception device 1200, manual setting content, automatic setting content, and the application state. In FIG. 12, parts that are the same as those of the receiving apparatus 700 described in the second embodiment of the present invention are denoted by the same reference numerals, and description thereof is omitted. The receiving device 1200 is, for example, a receiving terminal that receives a digitally modulated signal with diversity.

  Next, only differences between the control unit 1201 and the control unit 701 in the second embodiment of the present invention will be described. FIG. 13 is a detailed block diagram of the control unit 1201 in the third embodiment of the present invention. The control unit 1201 includes a reception state determination threshold setting unit 1301, an intermittent reception cycle setting unit 1302, and an effect determination threshold setting unit 1303 in addition to the control unit 112 in the first embodiment of the present invention.

  The reception method determination threshold setting unit 1301 receives the reception method by the reception method switching unit 202 based on the state of the reception device 1200 obtained by the state determination unit 1202 and the movement speed of the reception device 1200 obtained from the movement speed detection unit 702. A reception state determination threshold value used for switching determination is set and recorded in the determination parameter storage unit 201. The intermittent reception cycle setting means 1302 sets an intermittent reception cycle based on the state of the reception device 1200 obtained by the state determination unit 1202 and the movement speed of the reception device 1200 obtained from the movement speed detection unit 702, and determines the determination parameter. Record in the storage unit 201. Based on the state of the receiving device 1200 obtained by the state determination unit 1202, the effect determination threshold setting unit 1303 sets the effect determination threshold used for the diversity reception effect determination by the diversity effect determination unit 203 and records it in the determination parameter storage unit 201. To do.

  The operation of receiving apparatus 1200 configured as described above will be described with reference to FIGS.

First, the operation at the time of single branch reception will be described with reference to FIG. FIG. 14 is an operation flowchart for single-branch reception of the reception device 1200 according to the third embodiment of the present invention.
First, the moving speed detection unit 702 calculates the moving speed of the receiving device 1200 by using a GPS or a gyro sensor (step S1401). Next, the state determination unit 1202 determines the state of the reception device 1200 such as the remaining battery level, manual setting state, automatic setting state, and application state of the reception device 1200 (step S1402). Next, the reception state determination threshold setting unit 1301 obtains a reception state determination threshold based on the calculated moving speed and the state of the reception device 1200, and sets the reception state determination threshold in the determination parameter storage unit 201 (step S1403). The subsequent processing is the same as steps S301 to S306 in FIG.

Next, the operation at the time of diversity reception will be described with reference to FIG. FIG. 15 is an operation flowchart for diversity reception by the receiving apparatus 1200 according to the third embodiment of the present invention.
First, the moving speed detector 702 calculates the moving speed of the receiving device 1200 by using a GPS or a gyro sensor (step S1501). Next, the state determination unit 1202 determines the state of the reception device 1200 such as the remaining battery level, manual setting state, automatic setting state, and application state of the reception device 1200 (step S1502).

  Next, the reception state determination threshold value setting unit 1301 obtains a reception state determination threshold value based on the calculated moving speed and the state of the reception device 1200, and sets the reception state determination threshold value in the determination parameter storage unit 201 (step S1503). Next, the effect determination threshold value setting unit 1303 obtains an effect determination threshold value based on the obtained state of the receiving device 1200, and sets it in the determination parameter storage unit 201 (step S1504). The subsequent processing is the same as steps S401 to S412 in FIG.

Next, the operation at the time of intermittent reception will be described with reference to FIG. FIG. 16 is an operation flowchart at the time of intermittent reception of the reception device 1200 according to the third embodiment of the present invention.
First, the moving speed detection unit 702 calculates the moving speed of the receiving device 1200 using GPS or a gyro sensor (step S1601). Next, the state determination unit 1202 determines the state of the reception device 1200 such as the remaining battery level, manual setting state, automatic setting state, and application state of the reception device 1200 (step S1602). Next, the reception state determination threshold setting unit 1301 obtains a reception state determination threshold based on the calculated moving speed and the state of the reception device 1200, and sets it in the determination parameter storage unit 201 (step S1603). Subsequent processing is the same processing as Step S1103 and Steps S501 to S507 in FIG.

  Here, setting of the reception state determination threshold value and the effect determination threshold value according to the state of the reception device 1200 will be described. Here, as an example, the state of the receiving device 1200 is the remaining battery level. When the battery level of the receiving device 1200 is sufficiently large, in order to perform diversity reception that increases power consumption but improves performance, the range between the threshold value α and the threshold value β in FIG. Set the threshold. Also in the diversity effect determination process, a large diversity reception can be performed by reducing the effect determination threshold. On the other hand, when the battery level is low, in order to minimize diversity reception, the threshold value α and β in FIG. 6 are narrowed and the effect determination threshold value is set large.

Switching between diversity reception and single-branch reception may be manual switching by the user, or the parameters may be changed with the setting contents as the state of the receiving device 1200.
Further, the frequency of a program or a call with intense movement may be determined based on ch (channel), time, program, call time, packet communication time, etc. automatically set by the receiving device 1200, and the parameters may be changed.

Further, the parameter may be changed depending on the state of the application, such as when an application that consumes a large amount of power is operating.
Further, when calculating reception quality or diversity effect determination, it may be calculated using an average value for a certain fixed time instead of an instantaneous value.

Furthermore, the speed detection of the receiving device 1200 may not be performed every time, but may be performed at regular intervals. Accordingly, the setting of the intermittent reception cycle and the reception state determination threshold value may be performed at regular intervals.
Furthermore, although the case where both the reception state determination threshold and the effect determination threshold are changed has been described, either one may be used. Also, either the high level or the low level may be changed in the reception state determination threshold.

Moreover, although it described that it switched to the branch with good reception quality in step S404, S409 of FIG. 15, you may switch to the one where the gain of an antenna is higher.
Furthermore, although the case where a sensor is used for the speed detection method has been shown, any method may be used without being limited thereto.

  According to the receiving apparatus 1200 of the third embodiment of the present invention, the control unit 1201 determines the reception state determination threshold value and the intermittent reception period based on the movement speed and the state parameter indicating the state of the receiving apparatus 1200. In addition, the control unit 1201 performs diversity reception suitable for the current environment and state of the reception device 1200 by setting the effect determination threshold based on the state parameter. Therefore, user convenience can be improved.

  INDUSTRIAL APPLICABILITY The present invention is useful for a diversity receiver that can prevent an increase in power consumption.

The block diagram of the receiver in the 1st Embodiment of this invention The detailed block diagram of the control part in the 1st Embodiment of this invention Operation flow diagram at the time of single-branch reception of the receiving apparatus according to the first embodiment of the present invention Operation flow diagram at the time of diversity reception of the receiving apparatus according to the first embodiment of the present invention. Operation flow diagram at the time of intermittent reception of the receiving apparatus in the first embodiment of the present invention FIG. 3 is a schematic diagram of reception method switching of the reception device according to the first embodiment of the present invention. The block diagram of the receiver in the 2nd Embodiment of this invention The detailed block diagram of the control part in the 2nd Embodiment of this invention Operation flow diagram at the time of single-branch reception of the receiving apparatus according to the second embodiment of the present invention Operation flow diagram at the time of diversity reception of the receiving apparatus in the second embodiment of the present invention Operation flow diagram at the time of intermittent reception of the receiving apparatus in the second embodiment of the present invention The block diagram of the receiver in the 3rd Embodiment of this invention The detailed block diagram of the control part in the 3rd Embodiment of this invention Operation flow diagram at the time of single-branch reception of the receiving apparatus according to the third embodiment of the present invention Operation flow diagram at the time of diversity reception of the receiving apparatus in the third embodiment of the present invention Operation flow diagram at the time of intermittent reception of the receiving device in the third embodiment of the present invention Block diagram of a conventional diversity receiver The figure which showed the system switching method of the conventional diversity receiver

Explanation of symbols

100 receiving apparatus 101 first antenna 102 second antenna 103 first tuner 104 second tuner 105 first demodulating unit 106 second demodulating unit 107 combining unit 108 error correcting unit 109 first reception quality judging unit 110 Second reception quality determination unit 111 Third reception quality determination unit 112 Control unit 113 Switch 114 Operation control unit 201 Determination parameter storage unit 202 Diversity effect determination unit 203 Reception method switching unit 700 Reception device 701 Control unit 702 Movement speed detection Unit 801 intermittent reception cycle setting unit 802 reception state determination threshold setting unit 1200 reception device 1201 control unit 1202 state determination unit 1301 reception state determination threshold setting unit 1302 intermittent reception cycle setting unit 1303 effect determination threshold setting unit 1700 diversity reception device 1701 first Antenna 1702 First frequency conversion unit 1703 First baseband demodulation preprocessing unit 1704 First reception processing unit power supply control unit 1705 Second antenna 1706 Second frequency conversion unit 1707 Second baseband demodulation preprocessing unit 1708 Second reception processing unit power control unit 1709 Weighted synthesis processing unit 1710 Baseband demodulation post-processing unit 1711 Received signal quality detection processing unit 1712 Information signal decoding unit 1713 Control signal decoding unit 1714 Information signal reproduction processing unit 1715 Display unit 1716 Information signal Playback processor power controller 1717 Display power controller 1718 Information signal decoder Power controller

Claims (9)

A plurality of receiving branches for receiving communication signals;
A branch reception quality determination unit for calculating branch reception quality indicating reception quality of a communication signal received by the reception branch;
A combining unit that combines the communication signals received by the receiving branch;
A combined reception quality determination unit that calculates combined reception quality indicating reception quality of the combined signal combined by the combining unit;
Based on the branch reception quality and the combined reception quality, a single branch reception method for receiving the communication signal in any one of the reception branches, or the communication signal in any one of the reception branches A diversity receiving apparatus comprising: a control unit that selects any one of the diversity reception methods for receiving the signal. The diversity receiver according to claim 1,
The controller is
A reception state determination threshold indicating a criterion for selecting the single branch reception method;
A diversity receiver that determines whether or not to select the single branch reception method based on the branch reception quality and the reception state determination threshold. The diversity receiver according to claim 1 or 2,
The controller is
A receiving branch selection unit for selecting any one of the receiving branches;
A diversity receiving apparatus comprising: an operation control unit that restricts operations of the reception branches other than those selected by the reception branch selection unit. The diversity receiver according to any one of claims 1 to 3,
The controller is
A diversity effect determination unit that calculates a diversity effect value indicating a difference between the best received reception quality of the reception branch and the combined reception quality;
A diversity effect determination threshold indicating a criterion for selecting the diversity reception method,
A diversity receiving apparatus that selects the single branch reception method until a predetermined period elapses when it is determined that the diversity effect value is smaller than a diversity effect determination threshold. The diversity receiver according to claim 4,
A moving speed detector for detecting a moving speed of the diversity receiver;
The controller is
A diversity receiver that sets at least one of the reception state determination threshold and the predetermined period based on the moving speed. The diversity receiver according to claim 5,
The controller is
A diversity receiving apparatus that sets at least one of the reception state determination threshold and the predetermined period based on the moving speed and a state parameter indicating the state of the diversity receiving apparatus. The diversity receiver according to claim 6,
The controller is
A diversity receiver that sets the diversity effect determination threshold based on the state parameter. The diversity receiver according to claim 6 or 7,
The state parameter is
A diversity receiving device having at least one of a battery remaining amount, an application state, manual setting content, and automatic setting content of the diversity receiving device. A branch receiving step in which the communication signal is received by a plurality of receiving branches that receive the communication signal;
Calculating branch reception quality indicating reception quality of the communication signal received in the branch reception step;
A combining step in which the communication signals received in the branch receiving step are combined;
A step of calculating combined reception quality indicating reception quality of the combined signal combined in the combining step;
Based on the branch reception quality and the combined reception quality, the communication signal is received at any one of the reception branches, or the communication at any one of the reception branches. A diversity receiving method comprising: selecting one of the diversity receiving methods for receiving a signal.

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