JP2005080228A - Transmitter and method for controlling transmission power - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmitter and a method for controlling transmission power which do not require a high-speed and high-performance computing unit for calculating transmission power so as to prevent excess output, and ease restrictions on an amplifier and a detection unit with respect to operation time. <P>SOLUTION: The transmitter 100, which takes out a part of output signals for executing detection and generating a detection value based on which gain of a variable gain amplifier 106 is adjusted, is provided with a control unit 111 for controlling the gain of the variable gain amplifier 106 based on the detection value. The control unit 111 is provided with an excess output detection unit 1111 which generates an excess output detection signal if it detects that the detection value is larger than a predetermined reference value, and a gain control unit 1112 which, on receiving the excess output detection signal, decreases the gain of the variable gain amplifier 106, but when the gain control unit 1112 does not receive the excess output detection signal, increases the gain of the variable gain amplifier 106 with a predetermined value for every predetermined time period so that the gain is set back to the predetermined reference value. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a transmission apparatus and a transmission power control method for extracting a part of an output signal, performing detection to generate a detection value, and adjusting the gain of a gain variable means according to the detection value.

  As a conventional first transmission apparatus, the one shown in FIG. 8 is generally known. 8 includes a quadrature modulator 11, a variable gain amplifier 12, a baseband unit 13, a mixer 14, a band limiting filter 15, a variable gain amplifier 16, an amplifier 17, and a directional coupler 18. , Amplifier 19, detector 20, comparator 21, and calculator 22.

  The quadrature modulator 11 performs quadrature modulation on the input signal S <b> 1 and provides it to the variable gain amplifier 12. The variable gain amplifier 12 amplifies the output signal of the quadrature modulator 11 with a predetermined gain based on the control signal from the baseband unit 13. The mixer 14 upconverts the output signal of the variable gain amplifier 12 to a radio frequency. The band limiting filter 15 removes unnecessary frequency components of the signal up-converted to the radio frequency band by the mixer 14.

  The variable gain amplifier 16 amplifies the output signal of the band limiting filter 15 with a predetermined gain. The amplifier 17 further amplifies the output signal of the variable gain amplifier 16. The directional coupler 18 takes out a part of the output signal S2 of the amplifier 17. The amplifier 19 amplifies the signal extracted by the directional coupler 18. The detector 20 detects the output signal of the amplifier 19. The comparator 21 compares the power of the output signal of the detection unit 20 with the power of the reference signal S3 from the calculation unit 22, and outputs a control signal S4 according to the difference. The calculation unit 22 transmits and receives information on the transmission power to and from the baseband unit 13, calculates based on the information on the transmission power and the control value of the variable gain amplifier 12, generates a reference signal S 3, and provides the reference signal S 3 to the comparator 21.

  In this transmission device 10, a detection value corresponding to the power of the output signal S 2 can be obtained by the detection unit 20 by extracting a part of the output signal S 2 by the directional coupler 18. The reference signal S3 corresponds to the detection value output from the detection unit 20 when the output signal S2 is output with the transmission power that should be originally intended. The comparator 21 obtains a difference between the reference signal S3 and the detection value obtained from the detection unit 20, and changes the control signal S4 of the variable gain amplifier 16 based on the difference. That is, the comparator 21 controls the variable gain amplifier 16 so as to increase the gain when the output signal S2 is less than the transmission power that should be originally, and conversely, the variable gain amplifier 16 so as to decrease the gain when the transmission power is excessive. To control.

  Next, an example of communication in which transmission power increases or decreases rapidly in time and control of transmission power in this example will be described with reference to the drawings.

  FIG. 9 is a diagram illustrating temporal changes in transmission power in a conventional transmission apparatus. Depending on the communication method, the transmission power may fluctuate rapidly in time as shown in FIG. An example of such a communication method in which transmission power changes with time is TPC control (Transmit Power Control) in the W-CDMA communication method.

  TPC control will be described with reference to FIG. In TPC control, a communication receiver measures the SIR quality of a received signal and instructs the transmission side to increase or decrease the transmission power.

  FIG. 10A is a diagram for explaining control in uplink communication in the conventional communication system. First, the base station 1001 receives a signal from the mobile station 1002 and measures the quality of the signal. When the base station 1001 determines that the communication quality of the received signal is poor, the base station 1001 instructs the mobile station 1002 to increase the transmission power. Conversely, when the base station 1001 determines that the communication quality of the received signal is sufficiently good, the base station 1001 instructs the mobile station 1002 to reduce the transmission power.

  FIG.10 (b) is a figure for demonstrating the control in the downlink communication in the conventional communication system. The mobile station 1002 receives a signal from the base station 1001, measures its communication quality, and instructs the base station 1001 to increase or decrease the transmission power according to the communication quality. By performing such TPC control, it is possible to reduce deterioration in communication quality due to interference with other signals, fading, and the like.

  In addition to TPC control, transmission power fluctuation due to ARQ (Automatic Repeat request) is also conceivable. ARQ is a request for retransmission of information to a communication partner when an error is detected in received information. In particular, in Type-II ARQ that transmits a signal different from the original at the time of retransmission in ARQ, a method of performing communication with different transmission power at the time of retransmission has been proposed, and the transmission power greatly varies in a short time. Further, even when data communication is performed at high speed using a packet communication method, such a temporal variation in transmission power may occur. In the future, in order to realize a higher communication speed, it is conceivable that the transmission power switching time will become shorter.

  As described above, in the case of the communication method in which the transmission power changes with time, the reference signal S3 needs to be sequentially changed in the transmission apparatus 10 of FIG. In order to generate the reference signal S <b> 3, the transmission device 10 obtains the total transmission power to be currently transmitted by the calculation unit 22. In this case, the calculation amount of the calculation unit 22 is enormous.

  As an example, in the case of the CDMA communication system (downlink), the total transmission power changes sequentially by the number of users, the number of multiplexed codes, and TPC control for each user. The calculation unit 22 needs to calculate the total transmission power in a short time while communicating with the baseband unit 13 and monitoring the control state of the variable gain amplifier 12. The load on the calculation unit 22 increases as the number of users increases and the time period of power control decreases, and it is required to be high speed and high performance.

  On the other hand, the actual transmission power must be converged to the target transmission power in a time sufficiently shorter than the time when the transmission power in FIG. 9 is constant, and the response speed of the variable gain amplifier 16 and the detection unit 20 is high. It is also necessary to be.

  Moreover, there exists a thing described in patent document 1 as a conventional 2nd transmitter. In this second conventional transmission apparatus, the detected value is digitized using an A / D converter, and a control signal for the variable gain amplifier is generated by digital signal processing.

  In the conventional first and second transmission apparatuses, the target transmission power is designated by an absolute value, and the output signal is fed back to match the power. FIG. 11 is a diagram for explaining transition of output power (transmission power) in a conventional transmission apparatus. In FIG. 11, the solid line A indicates the target transmission power, and the dotted line B indicates the power of the signal that is actually output.

As shown in FIG. 11, overshoot and undershoot occur with respect to the target transmission power. In actual design, it is necessary to design a circuit so that the overshoot and undershoot are reduced and the transmission power converges within a certain time.
Japanese Patent Laid-Open No. 10-22756

  However, the conventional first transmission apparatus requires a high-speed and high-performance transmission power calculation unit in order to prevent excessive output in the case of communication in which transmission power increases or decreases rapidly over time. There's a problem.

  Further, in the conventional first and second transmitters, in the case of communication in which the transmission power increases or decreases rapidly, the control time is severely limited, and it is not possible to simply increase the response speed. In the worst case, shoots and overshoots may occur and oscillation may occur. In addition, if the time constant of the detection unit is simply reduced, the detection accuracy may deteriorate due to the influence of noise.

  The present invention has been made in view of the above points, eliminates the need for a high-speed and high-performance calculation unit for calculating transmission power in order to prevent an excessive output, and temporally operates the amplifier and the detection unit. It is an object of the present invention to provide a transmission device and a transmission power control method that can relax the restriction.

  The transmission apparatus according to claim 1 is a transmission apparatus that extracts a part of an output signal, performs detection to generate a detection value, and adjusts the gain of the gain variable means based on the detection value. Control means for controlling the gain of the gain variable means based on, the control means detects that the detected value is greater than a predetermined reference value, and generates an overoutput detection signal; When the overpower detection signal is received from the overpower detection means, the gain of the gain variable means is decreased, and when the overpower detection signal is not received, the gain of the gain variable means is set to a predetermined value every predetermined time. And gain control means for returning to the predetermined reference value.

  According to this configuration, a high-speed and high-performance computing unit that computes transmission power in order to prevent an excessive output is unnecessary, and time restrictions on the operations of the amplifier and the detector can be relaxed.

  According to a second aspect of the present invention, there is provided the transmitter according to the first aspect, wherein the temperature measuring unit that measures the ambient temperature of the transmitter and generates a measured temperature value, and the gain variable unit according to the temperature. A temperature compensation table storing a plurality of default control values, wherein the control means is one of the plurality of default control values of the temperature compensation table in accordance with the measured temperature values from the temperature measurement means. A configuration is adopted in which the gain of the variable gain means is controlled based on the selected predetermined control value.

  According to this configuration, in addition to the effect of the invention described in claim 1, it is possible to reduce the influence due to the fluctuation of the gain due to the temperature.

  A transmission device according to claim 3 is the communication device according to claim 1, wherein the transmission device detects a state of the output signal currently output by the transmission device and generates a communication state detection value. A communication state table storing a plurality of predetermined control values of the gain variable means according to the state of the output signal output from the transmission device, and the control means receives the communication state from the communication state notification means A configuration is adopted in which one of the plurality of predetermined control values in the communication state table is selected according to a detection value, and the gain of the gain variable means is controlled based on the selected predetermined control value.

  According to this configuration, in addition to the effect of the invention according to claim 1, since it is possible to accurately detect that the output is excessive even if the state of the signal being transmitted changes, the transmitter can output excessive output. Or a state in which transmission cannot be performed at the maximum transmission power.

  According to a fourth aspect of the present invention, there is provided the transmission apparatus according to the first aspect, wherein the transmission state in the first aspect of the present invention detects whether or not the communication state is abnormal by monitoring the gain of the gain variable means and generates a monitoring result. A monitoring unit is provided, and the control unit controls the gain of the variable gain unit based on the monitoring result from the communication state monitoring unit.

  According to this configuration, in addition to the effect of the invention described in claim 1, the state monitoring means monitors the gain state of the variable gain means, generates a monitoring result, and based on the monitoring result, the variable gain increasing means The gain can be effectively controlled.

  6. The transmission power control method according to claim 5, wherein a part of the output signal is extracted and detected to generate a detected value, and the gain of the gain variable means of the transmitting apparatus is adjusted based on the detected value. In the method, an overpower detection step of generating an overpower detection signal by detecting that the detected value is larger than a predetermined reference value, and reducing the gain of the gain variable means when receiving the overpower detection signal And a control step of increasing the gain of the gain variable means by a predetermined value and returning to the predetermined reference value every predetermined time when the overpower detection signal is not received.

  According to this method, a high-speed and high-performance computing unit that computes transmission power in order to prevent an excessive output is unnecessary, and time restrictions on the operation of the amplifier and the detecting unit can be relaxed.

  The transmission power control method according to claim 6 is the transmission power control method according to claim 5, wherein the control step measures a temperature around the transmission device to generate a measured temperature value, and the temperature Selecting one of a plurality of predetermined control values of a temperature compensation table according to the measured temperature value in the measuring step and controlling the gain of the gain varying means based on the selected predetermined control value; It was made to have.

  According to this method, in addition to the effect of the invention according to the fifth aspect, it is possible to reduce the influence due to the variation of the gain due to the temperature.

  The transmission power control method according to claim 7 is the transmission power control method according to claim 5, wherein the control step detects a state of an output signal currently output by the transmission device and generates a communication state detection value. The gain variable based on the default control value selected by selecting one of a plurality of default control values in the communication status table according to the communication status detection value in the communication status notification step and the communication status notification step Controlling the gain of the means.

  According to this method, in addition to the effect of the invention described in claim 5, since it is possible to accurately detect that the output is overpower even if the state of the signal being transmitted changes, the transmitter can output overpower. Or a state in which transmission cannot be performed at the maximum transmission power.

  The transmission power control method according to claim 8 is the transmission power control method according to claim 5, wherein the control step detects whether or not a communication state is abnormal by monitoring a gain of the gain variable means. A communication state monitoring step of generating a monitoring result; and a step of controlling the gain of the gain varying means based on the monitoring result in the communication state monitoring step.

  According to this method, in addition to the effect of the invention described in claim 5, the state monitoring means monitors the gain state of the variable gain means to generate a monitoring result, and based on the monitoring result, the variable gain increasing means The gain can be effectively controlled.

  As described above, according to the present invention, there is no need for a high-speed and high-performance calculation unit for calculating transmission power in order to prevent excessive output, and the time constraints on the operation of the amplifier and the detection unit are alleviated. be able to.

  The essence of the present invention is to extract a part of an output signal and perform detection to generate a detection value, detect that the detection value is larger than a predetermined reference value, generate an overoutput detection signal, and detect the overoutput detection. When the signal is received, the gain of the variable gain means is decreased, and when no excessive output detection signal is received, the gain of the variable gain means is increased by a predetermined value every predetermined time and returned to the predetermined reference value. It is to let you.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a diagram showing a configuration of a transmission apparatus according to Embodiment 1 of the present invention.

  As shown in FIG. 1, a transmission apparatus 100 according to Embodiment 1 of the present invention includes a quadrature modulator 101, a variable gain amplifier 102, a baseband unit 103, a mixer 104, a band limiting filter 105, a variable gain amplifier 106, and an amplifier. 107, a directional coupler 108, an amplifier 109, a detection unit 110, and a control unit 111.

  The quadrature modulator 101 performs quadrature modulation on the input signal S101 and supplies the result to the variable gain amplifier 102. The variable gain amplifier 102 amplifies the output signal of the quadrature modulator 101 with a predetermined gain based on the control signal from the baseband unit 103. The variable gain amplifier 102 is for performing transmission power control in TPC control, for example. The mixer 104 up-converts the output signal of the variable gain amplifier 102 to a radio frequency. The band limiting filter 105 removes unnecessary frequency components of the signal up-converted to the radio frequency band by the mixer 104.

  The variable gain amplifier 106 amplifies the output signal of the band limiting filter 105 with a predetermined gain. The amplifier 107 further amplifies the output signal of the variable gain amplifier 106 to generate an output signal S102. The directional coupler 108 extracts a part of the output signal S102 of the amplifier 107. The amplifier 109 amplifies the signal extracted by the directional coupler 108. The detector 110 detects the output signal of the amplifier 109. The control unit 111 adjusts the gain / gain control signal S103 of the variable gain amplifier 106 based on the detection value that is the power value of the output signal of the detection unit 110. The gain of the variable gain amplifier 106 is adjusted by a gain / gain control signal S103 from the control unit 111.

  The control unit 111 does not exceed a predetermined reference value (regulated power value due to regulations such as radio wave law and communication system transmission) that the output signal S102 of the transmission device 100 should not output, that is, in an overoutput state. The gain of the variable gain amplifier 106 is controlled so that it does not occur.

  The control unit 111 includes an overpower detection unit 1111 and a gain control unit 1112. The overpower detection unit 1111 detects that the detection value from the detection unit 110 is greater than a predetermined reference value, generates an overpower detection signal, and provides the signal to the gain control unit 1112. The gain control unit 1112 gives the gain control signal S103 to the variable gain amplifier 106 when receiving the over output detection signal from the over output detection unit 1111 to reduce the gain of the variable gain amplifier 106 and no longer receives the over output detection signal. At this time, the gain control signal S103 is given to the variable gain amplifier 106 every predetermined time to increase the gain of the variable gain amplifier 106 by a predetermined value and return to a predetermined reference value.

  Next, the operation of control section 111 of transmitting apparatus 100 according to Embodiment 1 of the present invention will be described with reference to FIG. 2 together with FIG. FIG. 2 is a flowchart for explaining the operation of control section 111 of transmitting apparatus 100 according to Embodiment 1 of the present invention.

  In FIG. 2, “Vamp” indicates the gain of the variable gain amplifier 106, and “TIMER” indicates the value of the timer (counter) inside the control unit 111. In the initial state, “Vamp” is a reference value and “TIMER” is zero. The initial value of “Vamp” is set to a reference value so that when the variable gain amplifier 102 has the maximum gain, the transmission apparatus 100 can output with the specified maximum transmission power value (that is, the output signal S102 has the maximum output value). Is set. The initial value of “Vamp” may be an arbitrary value. The control unit 111 stores in advance a detection value obtained from the detection unit 110 when the output signal S102 is in an overoutput state, and detects the overoutput state by monitoring the detection value from the detection unit 110. Keep it available.

  First, in step ST201, the control unit 111 determines whether or not the output is excessive. When the output is excessive in step ST201, the control unit 111 decreases “Vamp” by α (step ST202), sets “TIMER” = 0 (step ST203), and returns to step 201. As the value of α is larger, the gain when an overpower is detected decreases more rapidly.

  When the output is not excessive in step ST201, control unit 111 determines whether or not “Vamp” = reference value (step ST204). When “Vamp” = reference value in step ST204, control section 111 sets “TIMER” = 0 (step ST203), and returns to step 201. When “Vamp” is not the reference value in step ST204, control section 111 determines whether or not “TIMER” is larger than β (step ST205). When TIMER "is larger than β in step ST205, control section 111 increases" Vamp "by γ (step ST206), sets TIMER" = 0 (step ST203), and returns to step 201. When “TIMER” is equal to or smaller than β in step ST205, control section 111 increments “TIMER” (step ST207) and returns to step 201.

  Note that by appropriately setting the values of γ and β, the control width and time can be set so that “Vamp” returns to the reference value. However, if the value of β is small, the gain of “Vamp” frequently increases and decreases, so that the gain of the output signal S102 may become unstable and communication quality may be degraded. It is desirable to have a size.

  For example, when the cause of the excessive output is only a temporally gentle cause such as the gain fluctuation of the transmission device 100 due to temperature characteristics, the gain is returned every tens of seconds to several minutes. It is desirable to set the value of. Further, the transmitting apparatus 100 may arbitrarily change the value of β and return “Vamp” to the original value every arbitrary time.

  In the transmission device 100, the control unit 111 operates as described above, so that the transmission device 100 can prevent a state in which transmission power is excessive due to circuit performance, mounting variation, temperature characteristics, and the like. . Further, in the transmission apparatus 100, even when an excessive output is temporarily generated due to temperature characteristics or the like, the gain is restored every predetermined time, so that the gain of the transmission apparatus 100 remains small. It will never be.

  Further, in the transmission apparatus 100, since the control is not sequentially adjusted to the target transmission power, a high-speed and high-performance calculation unit for calculating the transmission power is not necessary, and the control unit 111 is simple and inexpensive, so that comparison is possible. This can be realized by a device having low performance, and restrictions on the response speed of the variable gain amplifier 106 and the detector 110 can be relaxed. At this time, since the closed loop transmission power control with the communication apparatus (base station or mobile station) of the communication partner is performed using the variable gain amplifier 102, there is no adverse effect on the communication quality.

  FIG. 3 is a diagram for explaining the transition of transmission power in transmitting apparatus 100 according to Embodiment 1 of the present invention. FIG. 4 is another diagram for explaining the transition of transmission power in transmission apparatus 100 according to Embodiment 1 of the present invention.

  The transmission apparatus 100 is variable so that the output power of the transmission apparatus 100 becomes the maximum transmission power determined by law when the output of the quadrature modulator 101 is maximum and the gain of the variable gain amplifier 102 is maximum. The gain of the gain amplifier 106 is adjusted initially. FIG. 3 shows the transition of transmission power in the normal operation state in the transmission apparatus 100. In the example illustrated in FIG. 3, the maximum transmission power determined by law and the maximum transmission power of the transmission device 100 are the same, so the transmission power does not become an excessive output. The overshoot and the undershoot are generated by a change in the gain of the variable gain amplifier 102, but are not so large as shown in FIG. 11 because there is no control to match the target transmission power with the feedback loop.

  It is also conceivable that the transmission device 100 outputs a larger transmission power due to a decrease in the ambient temperature. FIG. 4 shows the transition of the transmission power of the transmission apparatus 100 at this time. In FIG. 4, first, the maximum transmission power of the transmission apparatus is larger than the maximum transmission power determined by law. The transmission power changes below the maximum transmission power of the transmission device 100, but exceeds the maximum transmission power determined by law for the first time at time 400. In the transmission apparatus 100, the control unit 111 detects transmission power that exceeds the legally required value at time 400, and starts to decrease the gain of the variable gain amplifier 106. The control unit 111 stops decreasing the gain of the variable gain amplifier 106 when the transmission power becomes equal to or less than the maximum transmission power determined by law at time 401.

  After this, if a sufficient amount of time has passed and the transmission power of the actual transmission device 100 does not exceed the maximum transmission power determined by law in the meantime, the control unit 111 sets the gain of the variable gain amplifier 106 every predetermined time. Increase it little by little and restore it. This corresponds to time 402 and time 403 in FIG.

  In this example, the maximum transmission power of the transmission device 100 increases with temperature, but when the temperature returns to the original value later, if the maximum transmission power of the transmission device 100 remains low, It becomes impossible to transmit at the maximum transmission power specified by law. For this reason, in the transmission apparatus 100, when the transmission power is not excessive output, the gain of the variable gain amplifier 106 is returned to the reference value every predetermined time. Further, in the transmitting apparatus 100, when time elapses and an overpower state is detected again at time 404, the gain is decreased again at time 405. With the above operation, the transmission power of the transmission device 100 does not exceed the maximum transmission power determined by law.

  The specification of the maximum transmission power of the transmission apparatus 100 is normally given as “◯ W ± Δ%”. The power that the control unit 111 determines to be an excessive output is set to an arbitrary power within this wide range. Thus, in the conventional control method, it is necessary to complete the power control in one slot or less (depending on the method, it is appropriate to converge the transmission power in a time that is a fraction of one slot or less). However, in the present invention, a time margin of about 1 slot to several slots can be provided. In addition, the processing speed of the control unit 111 may be slowed down.

  In the transmission apparatus 100, an excessive output of the transmission power is detected, the gain of the variable gain amplifier 106 is lowered as necessary, and the gain of the variable gain amplifier 106 returns to the reference value when a time other than the excessive output state continues. Even if the initial set gain of the gain amplifier 106 is set slightly larger, there is no problem in actual operation.

  In the TPC control, a communication apparatus as a communication partner receives a signal, and instructs increase / decrease of transmission power depending on the state of the signal. This is not just a matter of distance, but varies in a short time due to many factors such as fading and path changes.

  In addition, it is considered that the frequency of transmission by the transmission device with the maximum transmission power specified by law is low because of power consumption problems and perspective problems in the case of CDMA.

  In the transmission apparatus according to Embodiment 1 of the present invention, the target transmission power is not calculated and the transmission power is not sequentially adjusted. However, in actuality, the transmission power is reduced by TPC control from the communication apparatus of the communication partner. Since control is performed so as to be appropriate, it is unlikely that the communication quality deteriorates in an actual operation state.

  As described above, according to Embodiment 1 of the present invention, the gain of the variable gain amplifier 106 is decreased only when the overpower of the transmission apparatus 100 is detected, and the gain is increased every predetermined time when the overpower is not over. Therefore, a high-speed and high-performance calculation unit for calculating the transmission power is not necessary, and the time constraints of the amplifier and the detection unit can be relaxed.

(Embodiment 2)
Next, a second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 5 is a diagram showing the configuration of the transmission apparatus according to Embodiment 2 of the present invention. In the second embodiment of the present invention, the same components as those in the first embodiment of the present invention are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 5, the transmission apparatus 500 according to Embodiment 2 of the present invention includes a control unit 501 instead of the control unit 111 in Embodiment 1 of the present invention, and includes a temperature measuring device 502 and temperature compensation. A table 503 is added. The temperature measuring device 502 and the temperature compensation table 503 are connected to the control unit 501. The temperature measuring device 502 measures the ambient temperature of the transmission device 500, generates a measured temperature value, and provides it to the control unit 501. The temperature compensation table 503 stores a plurality of predetermined control values of the variable gain amplifier 106 corresponding to the temperature. In addition to the operation according to Embodiment 1 of the present invention, the control unit 501 selects one of a plurality of predetermined control values in the temperature compensation table 503 according to the measured temperature value from the temperature measuring device 502. The gain of the variable gain amplifier 106 is controlled based on the selected default control value.

  Next, the operation of transmitting apparatus 500 according to Embodiment 2 of the present invention will be described.

  In general, the gain of an analog circuit varies with temperature. For this reason, it is considered that the gain of the variable gain amplifier 106 for maximizing the power of the output signal S102 is not constant with respect to the maximum transmission power of the variable gain amplifier 102. The temperature compensation table 503 stores a plurality of predetermined control values of the variable gain amplifier 106 that can output the output signal S102 at the maximum transmission power for each temperature.

  In the transmission device 500, the control unit 501 changes the reference value (reference gain) of the variable gain amplifier 106 according to the measured temperature value from the temperature measuring device 502. Thereby, even if the gain of the transmission device 500 decreases due to the temperature characteristics, it is possible to prevent the transmission device 500 from being unable to transmit at the specified maximum transmission power. On the contrary, even if the gain of the transmission device 500 increases due to the temperature characteristics, it is possible to prevent the gain of the variable gain amplifier 106 from becoming unstable by frequently detecting an overpower state.

  Note that if the temperature measuring device 502 is installed in the vicinity of a part (FET or the like) that generates the most heat in the circuit or the fin of the heat dissipating block, it is easy to grasp the characteristic variation of the transmitting device 500 due to the temperature.

  As described above, according to the second embodiment of the present invention, the temperature measuring instrument has the effect of the first embodiment of the present invention, and the control unit 501 performs the temperature measurement in addition to the operation according to the first embodiment of the present invention. Since one of a plurality of predetermined control values in the temperature compensation table 503 is selected according to the measured temperature value from 502 and the gain of the variable gain amplifier 106 is controlled based on the selected predetermined control value, the gain due to temperature The effect of fluctuations can be reduced.

(Embodiment 3)
Next, Embodiment 3 of the present invention will be described in detail with reference to the drawings. FIG. 6 is a diagram showing the configuration of the transmission apparatus according to Embodiment 3 of the present invention. In the third embodiment of the present invention, the same components as those in the first embodiment of the present invention are designated by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 6, transmission apparatus 600 according to Embodiment 3 of the present invention includes control section 601 instead of control section 111 in Embodiment 1 of the present invention, and includes communication status notification section 602 and communication A state table 603 is added. The communication state notification unit 602 is connected between the baseband unit 103 and the control unit 601. The communication state table 603 is connected to the control unit 601.

  The communication state notification unit 602 receives a signal indicating the current communication state from the baseband unit 103, detects the state of the output signal S102 currently output by the transmission device 600, generates a communication state detection value, and generates a control unit 601. To inform. The communication state table 603 stores a plurality of predetermined control values of the variable gain amplifier 106 corresponding to the state of the output signal S102 output from the transmission device 600. The control unit 601 selects one of a plurality of predetermined control values in the communication state table 603 according to the communication state detection value from the communication state notification unit 602, and based on the selected default control value, the variable gain amplifier 106. To control the gain.

  Next, the operation of transmitting apparatus 600 according to Embodiment 3 of the present invention will be described.

  It is conceivable that the characteristics of the detection unit 110 change depending on the modulation scheme of the signal being transmitted and factors such as PAR (Peak-to-Average Power Ratio) or burst. That is, even if the output signal S102 of the transmission device 600 has the same power, the detection value output by the detection unit 110 may change depending on the communication state.

  The communication state table 603 stores how many detection values obtained from the detection unit 110 in various communication states indicate that the output signal S102 is overpowered. In addition, the control unit 601 obtains a communication state detection value indicating the state of the output signal S102 currently output by the transmission device 600 from the communication state notification unit 602. The control unit 601 selects one of a plurality of predetermined control values in the communication state table 603 according to the communication state detection value from the communication state notification unit 602, and based on the selected default control value, the variable gain amplifier 106. To control the gain. Thereby, even if the state of the signal being transmitted changes, the transmission device 600 can accurately detect that the transmission power is an excessive output.

  As described above, according to the third embodiment of the present invention, the effect of the first embodiment of the present invention is obtained, and it is possible to accurately detect that the output is excessive even if the state of the signal being transmitted changes. Therefore, it is possible to make it difficult for the transmission apparatus 600 to fall into an overpowered state or a state in which transmission cannot be performed with the maximum transmission power.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described in detail with reference to the drawings. FIG. 7 is a diagram showing a configuration of a transmission apparatus according to Embodiment 4 of the present invention. In the fourth embodiment of the present invention, the same components as those in the first embodiment of the present invention are designated by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 7, a transmission apparatus 700 according to Embodiment 4 of the present invention includes a control unit 701 instead of the control unit 111 and adds a state monitoring unit 702 in Embodiment 1 of the present invention. It becomes.

  As shown in FIG. 7, the baseband unit 103 provides a control signal to the variable gain amplifier 102 and the state monitoring unit 702. The state monitoring unit 702 gives an instruction signal to the control unit 701, and gives a warning signal and an instruction signal to the baseband unit 103.

  As described above, the transmission apparatus 700 performs transmission power control with the communication apparatus (base station true or mobile station) of the communication partner using the variable gain amplifier 102, and the variable gain amplifier 106 sets the transmission apparatus 700 to an over output state. Gain control is performed so as not to occur. In the transmission apparatus 700, the state monitoring unit 702 monitors two control contents, generates a monitoring result, and gives a control signal to the baseband unit 103 and the control unit 701 based on the monitoring result to provide the variable gain amplifier 102, The operation of 106 is controlled and a warning signal is issued to the baseband unit 103.

  Next, operations of control section 701 and state monitoring section 702 of transmitting apparatus 700 according to Embodiment 4 of the present invention will be described with reference to FIG.

  (1) First, the operation when the two variable gain amplifiers 102 and 106 both try to increase the gain will be described.

  The state monitoring unit 702 provides a control signal to the control unit 701 so as to increase the value of γ (see FIG. 2), and the state monitoring unit 702 provides the control signal to the baseband unit 103 to provide the variable gain amplifier 102. The gain of the transmitting apparatus 700 can be increased by increasing the gain increase amount of the transmitter 700.

  In addition, if there is a problem that the gain becomes instantaneously excessive due to an increase in gain of both the two variable gain amplifiers 102 and 106, the state monitoring unit 702 sends the gain of the variable gain amplifier 106 to the control unit 701. An instruction signal is given to slow the increase. For example, the state monitoring unit 702 can prevent the gains of the two variable gain amplifiers 102 and 106 from increasing simultaneously by setting “TIMER” shown in FIG. Further, the state monitoring unit 702 can obtain the same effect by giving an instruction signal to the baseband unit 103 so as to delay the increase in the gain of the variable gain amplifier 102.

  (2) Next, the operation when the variable gain amplifier 102 increases the gain and the variable gain amplifier 106 decreases the gain will be described.

  If the variable gain amplifier 102 is trying to increase the gain even though the output signal S102 is already in an overoutput state, it can be determined that the state is abnormal. Possible causes are that the distance between the transmission device 700 and the communication device of the communication partner is too large, there is a problem in the propagation path such as communication being blocked, or the output signal S102 due to a failure of the transmission device 700. May not be output normally.

  In this case, since the communication state or the transmission apparatus 700 is abnormal, the state monitoring unit 702 notifies the baseband unit 103 of a warning signal and performs an operation such as stopping communication.

  (3) Next, the case where the variable gain amplifier 102 lowers the gain and the variable gain amplifier 106 increases the gain will be described.

  This is a control that can be in an actual operation state. However, increasing the gain on one of the variable gain amplifiers 102 and 106 and decreasing the gain on the other of the variable gain amplifiers 102 and 106 may cancel each other's operations. In this case, the state monitoring unit 702 gives an instruction signal to the control unit 701 or the baseband unit 103 so as to stop the gain control to the variable gain amplifier 106 or the variable gain amplifier 102 for a predetermined time.

  (4) Next, the operation when the two variable gain amplifiers 102 and 106 both try to reduce the gain will be described.

  The state monitoring unit 702 provides a control signal to the control unit 701 so as to increase the value of α (see FIG. 2), and the state monitoring unit 702 provides the control signal to the baseband unit 103 to provide the variable gain amplifier 102. The gain of the transmission apparatus 700 can be reduced by increasing the amount of decrease in the gain of the transmitter 700 more than usual.

  In addition, if there is a problem that the gain is instantaneously reduced by reducing the gains of the two variable gain amplifiers 102 and 106, the state monitoring unit 702 sends the gain of the variable gain amplifier 106 to the control unit 701. An instruction signal is given to slow down the decrease. For example, there is a method in which the state monitoring unit 702 gives an instruction signal to the baseband unit 103 so as to delay the decrease in the gain of the variable gain amplifier 102.

  In addition, if the control gain amount of the variable gain amplifier 106 is too large or too small, there is a possibility that the transmission apparatus 700 is abnormal, so the state monitoring unit 702 uses the warning signal as a base. Informs the band unit 103.

  Thus, according to the fourth embodiment of the present invention, the effects of the first embodiment of the present invention are obtained, and the state monitoring unit 702 monitors and monitors the gain states of the two variable gain amplifiers 102 and 106. A result is generated, and the gains of the two variable gain amplifiers 102 and 106 can be effectively controlled based on the monitoring result, and an abnormal state of the transmission apparatus 700 can be detected and warned.

  The present invention can be applied to a base station apparatus or a mobile station apparatus that performs wireless communication.

The figure which shows the structure of the transmitter which concerns on Embodiment 1 of this invention. The flowchart for demonstrating operation | movement of the control part of the transmitter which concerns on Embodiment 1 of this invention. The figure for demonstrating transition of the transmission power in the transmission apparatus which concerns on Embodiment 1 of this invention. Another figure for demonstrating transition of the transmission power in the transmission apparatus which concerns on Embodiment 1 of this invention. The figure which shows the structure of the transmitter which concerns on Embodiment 2 of this invention. The figure which shows the structure of the transmitter which concerns on Embodiment 3 of this invention. The figure which shows the structure of the transmitter which concerns on Embodiment 4 of this invention. The figure which shows the structure of the conventional transmitter The figure which shows the time change of the transmission power in the conventional transmitter. (A) The figure for demonstrating the control in the uplink communication in the conventional communication system, (b) The figure for demonstrating the control in the downlink communication in the conventional communication system The figure for demonstrating transition of the output power (transmission power) in the conventional transmitter

Explanation of symbols

100, 500, 600, 700 Transmitting apparatus 101 Quadrature modulator 102 Variable gain amplifier 103 Baseband unit 104 Mixer 105 Band limiting filter 106 Variable gain amplifier 107 Amplifier 108 Directional coupler 109 Amplifier 110 Detector 111, 501, 601, 701 Control unit 502 Temperature measuring device 503 Temperature compensation table 602 Communication state notification unit 603 Communication state table 702 State monitoring unit

Claims (8)

  In a transmitting apparatus that extracts a part of an output signal, performs detection to generate a detection value, and adjusts the gain of the gain variable means based on the detected value, controls the gain of the gain variable means based on the detected value And a control means for detecting that the detected value is larger than a predetermined reference value and generating an overoutput detection signal, and the overoutput from the overoutput detection means. When the detection signal is received, the gain of the gain variable means is decreased, and when the over-output detection signal is not received, the gain of the gain variable means is increased by a predetermined value every predetermined time to the predetermined reference value. And a gain control means for returning.   A temperature measuring unit that measures a temperature around the transmitter to generate a measured temperature value; and a temperature compensation table that stores a plurality of predetermined control values of the gain variable unit according to the temperature. The means is configured to select one of the plurality of predetermined control values in the temperature compensation table according to the measured temperature value from the temperature measuring unit and to select the gain variable unit based on the selected control value. The transmitting apparatus according to claim 1, wherein the gain is controlled.   A plurality of communication state notifying means for detecting a state of the output signal currently output by the transmission device and generating a communication state detection value; and a plurality of gain variable means corresponding to the state of the output signal output by the transmission device A communication state table storing a predetermined control value of the communication state table, and the control unit is configured to select one of the plurality of predetermined control values of the communication state table according to the communication state detection value from the communication state notification unit. 2. The transmission apparatus according to claim 1, wherein a gain of the gain varying means is controlled based on the predetermined control value selected by selecting one.   It comprises communication state monitoring means for detecting whether or not the communication state is abnormal by monitoring the gain of the gain variable means and generating a monitoring result, and the control means includes the communication state monitoring means from the communication state monitoring means. The transmission apparatus according to claim 1, wherein the gain of the gain varying unit is controlled based on a monitoring result.   In a transmission power control method for extracting a part of an output signal, performing detection to generate a detection value, and adjusting the gain of a gain variable unit of the transmission device based on the detection value, the detection value is greater than a predetermined reference value. An over-output detection step for detecting an over-output detection signal by detecting a large value, and a predetermined gain when the over-output detection signal is not received and the gain of the gain variable means is decreased when the over-output detection signal is received. And a control step of increasing the gain of the gain varying means by a predetermined value every time and returning to the predetermined reference value.   The control step includes: a temperature measurement step for measuring a temperature around the transmission device to generate a measurement temperature value; and a plurality of predetermined control values in a temperature compensation table according to the measurement temperature value in the temperature measurement step. And controlling the gain of the variable gain means based on the predetermined control value selected by selecting one of the transmission power control methods according to claim 5.   The control step detects a state of an output signal currently output by the transmitting device and generates a communication state detection value, and performs communication according to the communication state detection value in the communication state notification step. 6. The transmission power control according to claim 5, further comprising the step of selecting one of a plurality of predetermined control values in a state table and controlling the gain of the gain varying means based on the selected predetermined control value. Method.   The control step includes monitoring the gain of the gain variable means to detect whether or not the communication state is abnormal and generating a monitoring result, and to the monitoring result in the communication state monitoring step 6. The transmission power control method according to claim 5, further comprising the step of controlling the gain of said gain varying means based on the step.

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