JP2011055074A - Radio apparatus and transmission characteristics correction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically correct transmission frequency characteristics of a modulation wave signal of a frequency division multiplex system. <P>SOLUTION: A detector 18 detects another modulation wave signal distributed from a distributor 17, and respectively measures electric power levels of object carrier waves of different two frequencies out of every carriers. A control unit 19 calculates difference values of the measured values of the electric power levels and setting values of the electric power level for every object carriers, and controls a variable equalizer 14 based on a slope of the transmission frequency characteristics shown by the comparison results of the magnitudes of these difference values. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a radio transmission technique, and more particularly to a technique for correcting transmission characteristics of a modulated wave signal modulated by a frequency division multiplexing method.

  In recent years, as a wireless communication system for mobile phone systems, W-CDMA (Wideband Code Division Multiple Access: 3rd generation mobile phone system) system and LTE (Long Term Evolution) which is a further evolution of W-CDMA high-speed data communication standard HSDPA. : Frequency division multiplexing method that multi-carrier modulates transmission data using a plurality of carrier waves provided on the frequency axis, such as a super 3G) method, is used as a base station of a mobile phone system. Wireless devices compatible with wireless communication systems are being used.

  In this type of radio apparatus, for example, after combining an OFDMA (Orthogonal Frequency Division Multiple Access) modulated wave signal used in the LTE system and a W-CDMA modulated wave signal used in the W-CDMA system, The OFDMA modulated wave signal and the W-CDMA modulated wave signal are amplified to a predetermined transmission power and then wirelessly transmitted from the antenna.

  In such a radio apparatus, as a related technique for correcting the transmission power of the modulated wave signal, the power level of the carrier wave of the modulated wave signal is detected, and the transmission power of the modulated wave signal is automatically set based on the detected power level. A correction has been proposed (see, for example, Patent Document 1).

JP 2002-300135 A

  However, in such a related technology, although the transmission power of the modulated wave signal is automatically corrected based on the power level detected from the transmitted modulated wave signal in the frequency division multiplexing radio apparatus, There is a problem that the transmission frequency characteristic cannot be automatically corrected.

  For example, in the case of an OFDMA modulated wave signal, when the bandwidth is 20 MHz, 100 subcarriers are provided, and the wireless device amplifies the modulated wave signal over a wide band with a single amplifier and transmits it wirelessly. Normally, correction is performed to flatten the transmission frequency characteristic by controlling the variable equalizer at the time of manufacture, but the transmission frequency characteristic of the amplifier may be inclined due to environmental conditions such as a temperature change or aging. The related art described above can correct the power level of the modulated wave signal to be transmitted, but does not have a configuration for correcting the transmission frequency characteristic.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a radio transmission technique capable of automatically correcting the transmission frequency characteristics of a frequency-division multiplexed modulation wave signal.

  In order to achieve such an object, a radio apparatus according to the present invention modulates input transmission data based on a frequency division multiplexing method using a plurality of carriers having different frequencies, and generates a modulated wave signal. A processing unit, a variable equalizer that adjusts a transmission frequency characteristic of the modulated wave signal generated by the modulation processing unit, an amplifier that amplifies the modulated wave signal whose transmission frequency characteristic is adjusted by the variable equalizer, and a modulation amplified by the amplifier A distributor that distributes the wave signal into two, an antenna that wirelessly transmits one modulated wave signal distributed by the distributor, and another modulated wave signal that is distributed by the distributor are detected and differed among the carriers A detector that measures the power level of each of the target carriers of two frequencies, and for each target carrier, calculate a difference value between the measured value of the power level and the set value of the power level, And a control unit that performs correction of the transmission frequency characteristic by controlling a variable equalizer based on the gradient of the transmission frequency characteristic indicated by the comparison result of comparing the magnitudes of these difference values.

  Further, a transmission characteristic correction method according to the present invention includes a modulation processing step for modulating input transmission data based on a frequency division multiplexing method using a plurality of subcarriers to generate a modulated wave signal, and a modulation processing unit. A transmission frequency characteristic adjustment step for adjusting the transmission frequency characteristic of the generated modulated wave signal, an amplification step for amplifying the modulated wave signal whose transmission frequency characteristic is adjusted in the transmission frequency characteristic adjustment step, and the modulation amplified in the amplification step A distribution step of distributing the wave signal into two, a wireless transmission step of wirelessly transmitting one modulated wave signal distributed in the distribution step from the antenna, and detecting the other modulated wave signal distributed in the distribution step, A detection step for measuring the power levels of the target carriers of two different frequencies among the subcarriers, and the power for each target carrier Calculate the difference value between the measured value of the bell and the set value of the power level, and control the adjustment in the transmission frequency characteristic adjustment step based on the slope of the transmission frequency characteristic indicated by the comparison result comparing the magnitude of these difference values A control step.

  According to the present invention, it is possible to automatically correct the transmission frequency characteristic of a frequency-division multiplexed modulation wave signal. Therefore, in the radio apparatus, power can be transmitted without wasting the entire frequency band of the modulated wave signal, and the modulation accuracy can be improved and the transmission quality can be improved. In addition, in the case of an amplifier that performs distortion compensation using a DPD (Digital Pre-Distortion) method, since a wide band becomes flat and demodulated data of a loopback becomes accurate, distortion characteristics and efficiency can be improved. .

It is a block diagram which shows the structure regarding the transmission system of the radio | wireless apparatus concerning 1st Embodiment. It is a subcarrier structural example of an OFDMA modulation wave signal. It is explanatory drawing which shows the power level of the object carrier wave of an OFDMA modulation wave signal. It is explanatory drawing which shows the power level of the object carrier wave of a W-CDMA modulation wave signal. It is a flowchart which shows the transmission characteristic correction process of the radio | wireless apparatus concerning 1st Embodiment. It is a block diagram which shows the structure regarding the transmission system of the radio | wireless apparatus concerning 2nd Embodiment. 10 is a flowchart illustrating a transmission characteristic correction process of the wireless device according to the second embodiment.

Next, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
First, with reference to FIG. 1, the radio | wireless apparatus concerning the 1st Embodiment of this invention is demonstrated. FIG. 1 is a block diagram illustrating a configuration related to a transmission system of the wireless device according to the first embodiment.

The radio apparatus 10 is used as a base station apparatus of a mobile phone system, for example, and modulates input transmission data based on a frequency division multiplexing system such as a W-CDMA system and an LTE system using a plurality of subcarriers. Is a wireless device for transmission. Note that the reception system of the wireless device 10 is not directly related to the present invention, and thus a detailed description of the reception system is omitted.
In this embodiment, a case in which both W-CDMA and LTE wireless communication systems are supported will be described as an example.

  The wireless device 10 includes an LTE modulation processing unit 11, a W-CDMA modulation processing unit 12, a combiner 13, a variable equalizer 14, an amplifier 16, a distributor 17, a detector 18, and a control unit 19 as main functional units. Is provided.

  The LTE modulation processing unit 11 has a function of generating an OFDMA modulated wave signal 23 including subcarriers of different frequencies as a carrier by performing frequency division multiplexing modulation on the input transmission data 21 based on the OFDMA scheme.

  The W-CDMA modulation processing unit 12 generates a W-CDMA modulated wave signal 24 for each of a plurality of carriers composed of carriers of different frequencies by performing frequency division multiplexing modulation on the input transmission data 22 based on the W-CDMA system. It has a function to do.

  The combiner 13 has a function of generating a modulated wave signal by combining the OFDMA modulated wave signal 23 output from the LTE modulation processing unit 11 and the W-CDMA modulated wave signal 24 output from the W-CDMA modulation processing unit 12. Have.

The variable equalizer 14 has a function of correcting the slope of the transmission frequency characteristic of the modulated wave signal synthesized by the synthesizer 13 based on the control signal 28 from the control unit 19.
FIG. 2 shows an example of the carrier structure of the LTE modulation scheme. In the case of the LTE modulation system, a single OFDMA modulated wave signal includes a plurality of subcarriers having different frequencies as carrier waves. In this example, in the 2100 MHz band, subcarriers having a bandwidth of 20 MHz are set as carrier waves centering on 2130 MHz, and when the subcarrier interval is 180 KHz, 100 subcarriers from 2121.09 MHz to 2138.91 MHz are used. Subcarriers can be set.

On the other hand, in the case of the W-CDMA modulation scheme, a plurality of carriers having different frequencies are set as carrier waves, and a W-CDMA modulated wave signal is generated for each carrier wave. Regarding the carrier structure of the W-CDMA modulated wave signal, in the case of the 2100 MHz band, for example, two carriers having a bandwidth of 60 MHz are set as carrier waves at intervals of 190 MHz among 2110 MHz to 2170 MHz.
In the configuration in which the OFDMA modulated wave signal 23 and the W-CDMA modulated wave signal 24 are combined and then amplified by one amplifier 16 as in the present embodiment, the OFDMA modulated wave signal 23 and the W-CDMA modulated wave signal 24 are The same frequency band is used for transmission, but each carrier uses a different frequency. Note that these carrier wave setting examples are merely examples, and the present invention can be applied to other setting examples.

  The variable equalizer 14 corrects the inclination of the power level of each carrier wave, that is, the inclination of the transmission frequency characteristic of the modulated wave signal, as shown by the broken line in FIG. In the configuration in which the OFDMA modulated wave signal 23 and the W-CDMA modulated wave signal 24 are combined and then amplified by one amplifier 16 as in the present embodiment, the OFDMA modulated wave signal 23 and the W-CDMA modulated wave signal are combined. The slope of the transmission frequency characteristic may be corrected based on one of the 24 modulation wave signals.

The amplifier 16 has a function of amplifying the modulated wave signal whose transmission frequency characteristics are adjusted by the variable equalizer 14.
The distributor 17 has a function of distributing the modulated wave signal amplified by the amplifier 16 to the antenna A and the detector 18.
The antenna A has a function of wirelessly transmitting one modulated wave signal distributed by the distributor 17.

  The detector 18 detects the other modulated wave signal distributed by the distributor 17, and is a target carrier having two different frequencies among the carriers composed of subcarriers included in the OFDMA modulated wave signal of the modulated wave signal. And the power level of each phase reference signal included in the target carrier of two different frequencies among the carriers composed of the carriers of the W-CDMA modulated wave signal included in the modulated wave signal. And a function of measuring each of them.

  In the present embodiment, in order to detect and correct the slope of the transmission frequency characteristic of the modulated wave signal, the carrier CL having the lowest frequency and the carrier CH having the highest frequency among the carriers of the modulated wave signal are used as target carriers. ing. In this way, by setting a large frequency difference between the two target carriers, a larger value can be obtained as the power level difference between the two indicating the slope of the transmission frequency characteristic as shown in FIG. Thereby, the measurement error contained in the power level difference between the two can be reduced, and the slope of the transmission frequency characteristic of the modulated wave signal can be accurately detected.

The control unit 19 has a function of controlling the variable equalizer based on the measured value of the power level of the target carrier wave measured by the detector 18 so that the slope of the transmission frequency characteristic of the modulated wave signal becomes flat.
The control unit 19 includes a transmission frequency characteristic correction unit 19A and a storage unit 19M as main processing units.
The storage unit 19M has a function of storing various processing information such as a power level setting value for the target carrier wave.

  The transmission frequency characteristic correction unit 19A calculates, for each target carrier measured by the detector 18, a difference value between the measured value of the power level of the target carrier and the set value of the power level read from the storage unit 19M. And a function for comparing the magnitudes of these difference values, and a function for controlling the variable equalizer so that the slope of the transmission frequency characteristic of the modulated wave signal indicated by the comparison result becomes flat. In the configuration in which the OFDMA modulated wave signal 23 and the W-CDMA modulated wave signal 24 are combined and then amplified by one amplifier 16 as in the present embodiment, the transmission frequency is based on one of the modulated wave signals. What is necessary is just to correct | amend the inclination of a characteristic.

  When correcting the transmission frequency characteristic based on the OFDMA modulated wave signal 23, the transmission frequency characteristic correcting unit 19A indicates that the OFDMA modulated wave signal 23 is being transmitted based on the operation information 25 notified from the LTE modulation processing unit 11. In addition, a target period that is not a burst state in which the presence or absence of data transmission is repeated at short intervals for both target carriers is confirmed, and a difference value is calculated based on a measured value of the power level detected in the target period by the detector 18. (First difference calculation unit). The operation information 25 notified from the LTE modulation processing unit 11 includes power level information regarding the OFDMA modulated wave signal 23 output from the LTE modulation processing unit 11.

  FIG. 3 is an explanatory diagram showing the power level of the target carrier wave of the OFDMA modulated wave signal. The power level of each subcarrier of the OFDMA modulated wave signal is zero when there is no transmission data, and varies greatly in a burst state. However, the power level of the subcarrier does not always fluctuate like the total power of the OFDMA modulated wave signal, and there is a stable period in which transmission is always performed at a constant power level. For this reason, for the OFDMA modulated wave signal, by confirming the stable period that is always transmitted at a constant power level as the target period, and calculating the difference value based on the measured value of the power level detected in this target period The inclination of the transmission frequency characteristic of the modulated wave signal can be detected with high accuracy.

  On the other hand, when correcting the transmission frequency characteristics based on the W-CDMA modulated wave signal 24, the detector 18 uses a phase reference signal (P-CPICH: Primary Common Pilot Channel) included in each carrier of the W-CDMA modulated wave signal 24. ) Power level. Further, the transmission frequency characteristic correction unit 19A confirms a target period indicating that the W-CDMA modulated wave signal 24 is being transmitted based on the operation information 26 notified from the W-CDMA modulation processing unit 12, and the detector 18 A difference value is calculated based on the measured value of the power level detected during the target period (second difference calculation unit).

  FIG. 4 is an explanatory diagram showing the power level of the target carrier wave of the W-CDMA modulated wave signal. A W-CDMA modulated wave signal is provided with a plurality of pilot channels for transmitting various signals such as a phase reference signal in one carrier. Among these, the power level of the phase reference signal does not always fluctuate like the total power of the W-CDMA modulated wave signal, and is always transmitted at a constant power level and is not affected by the presence or absence of transmission data. . Therefore, for the W-CDMA modulated wave signal, the slope of the transmission frequency characteristic of the modulated wave signal is accurately detected regardless of the burst state by calculating the difference value based on the measured value of the power level of the phase reference signal. be able to.

  Among these functional units, the LTE modulation processing unit 11, the W-CDMA modulation processing unit 12, the synthesizer 13, the variable equalizer 14, the amplifier 16, the distributor 17, and the detector 18 are each configured by dedicated radio circuits. ing. Note that a digital signal arithmetic processing circuit such as a DSP may be used as the detector 18. The control unit 19 includes a CPU and its peripheral circuits, and is realized by an arithmetic processing unit that implements various processing units by reading and executing a program stored in the storage unit 19M.

[Operation of First Embodiment]
Next, the operation of the radio apparatus according to the present embodiment will be described with reference to FIG. FIG. 5 is a flowchart illustrating a transmission characteristic correction process of the wireless device according to the first embodiment.

The transmission frequency characteristic correction unit 19A of the control unit 19 first transmits the OFDMA modulated wave signal 23 based on the operation information 25 notified from the LTE modulation processing unit 11 and transmits data for both of the target carriers. It is confirmed whether or not the target period is not a burst state in which presence / absence is repeated at short intervals (step 100).
Here, when the OFDMA modulated wave signal 23 is the target period (step 100: YES), the transmission frequency characteristic correcting unit 19A corrects the transmission frequency characteristic based on the OFDMA modulated wave signal 23 through the following steps 110 to 114. To do.

When correcting the transmission frequency characteristics based on the OFDMA modulated wave signal 23, the transmission frequency characteristic correcting unit 19A first measures the power levels of the target carriers CL and CH in the OFDMA modulated wave signal 23 by the detector 18 ( In step 110), the measurement values Pol and Poh are acquired as the measurement result 27 (step 111).
Further, the transmission frequency characteristic correction unit 19A acquires the power level setting values Sol and Soh of the target carriers CL and CH from the storage unit 19M (step 112), and the difference between these measurement values and the setting values Pol-Sol and Poh- Based on the comparison result of Soh, a control value Cof of the transmission frequency characteristic for the variable equalizer 14 is calculated (step 113).

Here, the variable equalizer 14 uses an integer as the control value Cof, and as the input control value Cof increases, the high frequency side of the transmission frequency characteristic decreases and the low frequency side increases, and the control value Cof decreases. Suppose that the transmission frequency characteristic has a control characteristic that the high frequency side is increased and the low frequency side is decreased.
With such control characteristics, the transmission frequency characteristic correcting unit 19A sets Cof = Cof ′ + 1 when (Pol-Sol)> (Poh-Soh), and (Pol-Sol) <(Poh-Soh). , Cof = Cof′−1, and Coff = Cof ′ when (Pol-Sol) = (Poh-Soh). Cof ′ represents the immediately preceding control value.

  Therefore, for example, the target carrier CL has a measured value Pol of +22 dBm with respect to the set value Sol of +20 dBm, and the target carrier CH has a measured value Poh of +16 dBm with respect to the set value Soh of +20 dBm. When Cof ′ is “10”, the control value Cof of the variable equalizer 14 has a transmission frequency characteristic that is lower to the right by about 6 dB on the high frequency side. The control value Cof of the variable equalizer 14 is increased by “1” and set to “11” so as to obtain frequency characteristics.

  By repeating such processing, the measured value Pol is +19 dBm for the set value Sol of the target carrier CL of +20 dBm, the measured value Poh is +19 dBm for the set value Soh of the target carrier CH of +20 dBm, and the transmission frequency characteristic is flat. become. In the case of the variable equalizer 14 that can specify the correction range of the transmission frequency characteristic as a decibel value as the control value Cof, a correction value equivalent to 6 dB may be set directly in the control value Cof.

  In this way, after calculating the control value Cof, the transmission frequency characteristic correction unit 19A controls the variable equalizer 14 based on the control signal 28 including the control value Cof to correct the transmission frequency characteristic of the modulated wave signal. (Step 114), the process returns to Step 100.

On the other hand, when it is determined in step 100 that the OFDMA modulated wave signal 23 is not the target period (step 100: NO), the transmission frequency characteristic correction unit 19A operates the operation information 26 notified from the W-CDMA modulation processing unit 12. Based on the above, it is confirmed whether or not it is a target period during which the W-CDMA modulated wave signal 24 is being transmitted (step 101).
Here, when the W-CDMA modulated wave signal 24 is the target period (step 101: YES), the transmission frequency characteristic correction unit 19A transmits based on the W-CDMA modulated wave signal 24 in the following steps 120 to 124. Correct the frequency characteristics.

When correcting the transmission frequency characteristic based on the W-CDMA modulated wave signal 24, first, the transmission frequency characteristic correcting unit 19 </ b> A is the target carrier CL corresponding to the phase reference signal of the W-CDMA modulated wave signal 24 by the detector 18. , CH are respectively measured (step 120), and the measurement values Pwl and Pwh are obtained as measurement results 27 (step 121).
Next, the transmission frequency characteristic correction unit 19A acquires the power level setting values Swl and Swh of the target carrier waves CL and CH from the storage unit 19M (step 122), and the difference between the measurement value and the setting value Pwl-Swl, Pwh- Based on the comparison result of Swh, a control value Cwf of the transmission frequency characteristic for the variable equalizer 14 is calculated (step 123).

Here, the variable equalizer 14 uses an integer as the control value Cwf, and as the value of the input control value Cwf increases, the high frequency side of the transmission frequency characteristic decreases and the low frequency side increases, and the value of the control value Cwf decreases. Suppose that the transmission frequency characteristic has a control characteristic that the high frequency side is increased and the low frequency side is decreased.
In such control characteristics, the transmission frequency characteristic correction unit 19A sets Cwf = Cwf ′ + 1 when (Pwl−Swl)> (Pwh−Swh), and (Pwl−Swl) <(Pwh−Swh). , Cwf = Cwf′−1, and in the case of (Pwl−Swl) = (Pwh−Swh), Cwf = Cwf ′. Cwf ′ indicates the previous control value.

  Therefore, for example, the target carrier CL has a measured value Pwl of +22 dBm with respect to the set value Swl of +20 dBm, and the target carrier CH has a measured value Pwh of +16 dBm with respect to the set value Swh of +20 dBm. When Cwf ′ is “10”, the control value Cwf of the variable equalizer 14 is a transmission frequency characteristic that decreases to the right by about 6 dB on the high frequency side. The control value Cwf of the variable equalizer 14 is increased by “1” and set to “11” so as to obtain frequency characteristics.

  By repeating such processing, the measured value Pwl is +19 dBm with respect to the set value Swl of the target carrier CL +20 dBm, the measured value Pwh is +19 dBm with respect to the set value Swh of the target carrier CH +20 dBm, and the transmission frequency characteristic is flat. become. In the case of the variable equalizer 14 in which the correction range of the transmission frequency characteristic can be specified by the decibel value as the control value Cwf, a correction value equivalent to 6 dB may be directly set to the control value Cwf.

In this way, after calculating the control value Cwf, the transmission frequency characteristic correction unit 19A controls the variable equalizer 14 based on the control signal 28 including the control value Cwf to correct the transmission frequency characteristic of the modulated wave signal. (Step 124), the process returns to Step 100.
In step 101, when the W-CDMA modulated wave signal 24 is not the target period (step 101: NO), the process returns to step 100.

[Effect of the first embodiment]
As described above, according to the present embodiment, the detector 18 detects the modulated wave signal distributed from the distributor 17 and measures the power levels of the target carriers having two different frequencies among the carrier waves. 19, for each target carrier wave, the difference value between the measured value of the power level and the set value of the power level is calculated, and variable based on the slope of the transmission frequency characteristic indicated by the comparison result obtained by comparing the magnitudes of the difference values. Since the transmission frequency characteristic is corrected by controlling the equalizer 14, the transmission frequency characteristic of the frequency-division multiplexed modulation wave signal can be automatically corrected.

  Therefore, since the transmission frequency characteristic is automatically corrected, the radio apparatus can transmit power without wasting the entire frequency band of the modulated wave signal, and the modulation accuracy can be improved and the transmission quality can be improved. In addition, in the case of an amplifier that performs distortion compensation using a DPD (Digital Pre-Distortion) method, since a wide band becomes flat and demodulated data of a loopback becomes accurate, distortion characteristics and efficiency can be improved. .

  Further, in the present embodiment, the LTE modulation processing unit 11 modulates transmission data based on the OFDMA method to generate a modulated wave signal composed of the OFDMA modulated wave signal 23, and the control unit 19 performs the LTE modulation processing unit. 11 shows the transmission period of the OFDMA modulated wave signal 23 on the basis of the operation information 25 notified from 11 and confirms the target period in which both of the target carriers are not in the burst state, and the measured value of the power level detected in the target period Therefore, even in the OFDMA method, variations in power level measurement values and errors can be suppressed, and the slope of the transmission frequency characteristic of the modulated wave signal can be detected with high accuracy.

  In the present embodiment, the W-CDMA modulation processing unit 12 modulates transmission data based on the W-CDMA system to generate a modulated wave signal composed of the W-CDMA modulated wave signal 24, and the detector 18. Then, when measuring the power level, the power level of each phase reference signal included in the target carrier in the W-CDMA modulated wave signal 24 is measured, and the control unit 19 determines from the W-CDMA modulation processing unit 12. Based on the notified operation information 26, the target period indicating that the W-CDMA modulated wave signal 24 is being transmitted is confirmed, and the difference value is calculated based on the measured value of the power level detected in the target period. Therefore, even in the case of the W-CDMA system, variations in power level measurement values and errors can be suppressed, and the slope of the transmission frequency characteristic of the modulated wave signal can be detected with high accuracy.

  In the present embodiment, when the radio apparatus 10 synthesizes and transmits the OFDMA modulated wave signal 23 and the W-CDMA modulated wave signal 24, the OFDMA modulated wave signal 23 is transmitted in the target period (first target Period) and the W-CDMA modulated wave signal 24 is the target period (second target period), the power measured from either the OFDMA modulated wave signal 23 or the W-CDMA modulated wave signal 24. The difference value is calculated based on the level, and when the OFDMA modulated wave signal 23 is not the target period and the W-CDMA modulated wave signal 24 is the target period, the difference value is calculated based on the power level measured from the W-CDMA modulated wave signal 24. The difference value is calculated, and when the OFDMA modulated wave signal 23 is the target period and the W-CDMA modulated wave signal 24 is not the target period, the OFDMA modulated wave signal 23 A difference value is calculated based on the measured power level, and when the OFDMA modulated wave signal 23 is not the target period and the W-CDMA modulated wave signal 24 is not the second target period, the transmission frequency characteristic is not corrected. Therefore, the transmission frequency characteristics can always be corrected except when both the OFDMA modulated wave signal 23 and the W-CDMA modulated wave signal 24 are not in the target period.

[Second Embodiment]
Next, with reference to FIG. 6, the radio | wireless apparatus concerning the 2nd Embodiment of this invention is demonstrated. FIG. 6 is a block diagram showing a configuration related to the transmission system of the radio apparatus according to the second embodiment, and the same or equivalent parts as in FIG.
In the present embodiment, a case will be described in which the radio apparatus according to the first embodiment corrects not only the slope of the transmission frequency characteristic of the modulated wave signal but also the transmission power level of the modulated wave signal.

  In the radio apparatus 10 according to the present embodiment, a variable attenuator 15 is added to the configuration of the first embodiment, and a power level correction unit 19B is added to the control unit 19. In the radio apparatus 10 according to the present embodiment, configurations other than these are the same as those in the first embodiment, and detailed description thereof is omitted here.

  The variable attenuator 15 is provided between the variable equalizer 14 and the amplifier 16 and has a function of adjusting the power level of the modulated wave signal whose transmission frequency characteristic is adjusted by the variable equalizer 14. Thereby, the amplifier 16 amplifies the modulated wave signal whose power level is adjusted by the variable attenuator 15 instead of the modulated wave signal whose transmission frequency characteristic is adjusted by the variable equalizer 14.

  The power level correction unit 19B compares the measured value of one of the target carriers measured by the detector 18 with the set value of the power level, and based on the comparison result, the power level of the modulated wave signal The variable attenuator 15 is controlled so as to reduce the difference. In the configuration in which the OFDMA modulated wave signal 23 and the W-CDMA modulated wave signal 24 are combined and amplified by one amplifier 16 as in the present embodiment, the transmission power is based on one of the modulated wave signals. What is necessary is just to correct | amend a level.

[Operation of Second Embodiment]
Next, with reference to FIG. 7, the operation of the radio apparatus according to the second embodiment of the present invention will be described. FIG. 7 is a flowchart showing a transmission characteristic correction process of the wireless device according to the second embodiment, and the same or equivalent parts as in FIG.

The transmission frequency characteristic correction unit 19A of the control unit 19 first transmits the OFDMA modulated wave signal 23 based on the operation information 25 notified from the LTE modulation processing unit 11 and transmits data for both of the target carriers. It is confirmed whether or not the target period is not a burst state in which presence / absence is repeated at short intervals (step 100).
Here, when the OFDMA modulated wave signal 23 is the target period (step 100: YES), the transmission frequency characteristic correcting unit 19A corrects the transmission frequency characteristic based on the OFDMA modulated wave signal 23 through the following steps 110 to 114. To do. In addition, the processing content of steps 110-114 is the same as that of FIG. 5, and a detailed description here is omitted.

After step 114, the power level correction unit 19B uses the detector 18 to measure the power level of the target carrier CL in the OFDMA modulated wave signal 23 (step 210), and obtains this measurement value Pol as the measurement result 27 (step). 211).
Further, the power level correction unit 19B acquires the power level setting value Sol of the target carrier CL from the storage unit 19M (step 212).

  Thereafter, the power level correction unit 19B adds the difference Pol-Sol between the measurement value and the set value to the previous control value Cop ′ stored in the storage unit 19M, thereby adjusting the attenuation level for the variable attenuator 15. A new control value Cop is calculated (step 213). Then, the power level correction unit 19B controls the variable attenuator 15 based on the control signal 29 including the control value Cop, corrects the transmission power level of the modulated wave signal (step 214), and returns to step 100.

On the other hand, when it is determined in step 100 that the OFDMA modulated wave signal 23 is not the target period (step 100: NO), the transmission frequency characteristic correction unit 19A operates the operation information 26 notified from the W-CDMA modulation processing unit 12. Based on the above, it is confirmed whether or not it is a target period during which the W-CDMA modulated wave signal 24 is being transmitted (step 101).
Here, when the W-CDMA modulated wave signal 24 is the target period (step 101: YES), the transmission frequency characteristic correction unit 19A transmits based on the W-CDMA modulated wave signal 24 in the following steps 120 to 124. Correct the frequency characteristics. Note that the processing contents of steps 120 to 124 are the same as those in FIG. 5, and a detailed description thereof will be omitted here.

After step 124, the power level correction unit 19B uses the detector 18 to measure the power level of the target carrier CL in the W-CDMA modulated wave signal 24 (step 220), and obtains the measurement value Pwl as the measurement result 27. (Step 221).
In addition, the power level correction unit 19B acquires the power level setting value Sw1 of the target carrier CL from the storage unit 19M (step 222).

Thereafter, the power level correction unit 19B adds the difference Pwl−Swl between the measurement value and the set value to the previous control value Cwp ′ stored in the storage unit 19M, thereby determining the attenuation level for the variable attenuator 15. A new control value Cwp is calculated (step 223). Then, the power level correction unit 19B controls the variable attenuator 15 based on the control signal 29 including the control value Cwp, corrects the transmission power level of the modulated wave signal (step 224), and returns to step 100.
In step 101, when the W-CDMA modulated wave signal 24 is not the target period (step 101: NO), the process returns to step 100.

[Effect of the second embodiment]
As described above, the present embodiment further includes the variable attenuator 15 that adjusts the power level of the modulated wave signal whose transmission frequency characteristic is adjusted by the variable equalizer, and the control unit 16 selects one of the power levels. Since the measured value of the power level is compared with the set value of the power level and the variable attenuator 15 is controlled so as to reduce the power level difference of the modulated wave signal indicated by the comparison result, the frequency division multiplexing system In addition to the transmission frequency characteristics of the modulated wave signal, the transmission power level can be automatically corrected. In addition, since the transmission power level is corrected after correcting the transmission frequency characteristics, the transmission power level can be corrected with extremely high accuracy over the entire frequency bandwidth of the modulated wave signal.

[Extended embodiment]
The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

  In the second embodiment, the case where both the transmission frequency characteristic and the transmission power level of the modulated wave signal are corrected has been described as an example. However, the present invention is not limited to this, and the second embodiment is not limited thereto. Only the transmission power level may be corrected based on the described configuration and method.

Specifically, steps 210 to 214 in FIG. 7 may be executed to correct the transmission power level based on the OFDMA modulated wave signal 23.
At this time, in the same manner as described above, based on the operation information 25 notified from the LTE modulation processing unit 11, a target period indicating that the OFDMA modulated wave signal 23 is being transmitted and both the target carriers are not in the burst state is confirmed. Because the difference value is calculated based on the measured power level value detected during the target period, even in the case of the OFDMA method, variations and errors in the measured power level value can be suppressed, and the transmission power level of the modulated wave signal can be accurately measured. It can be corrected well.

Alternatively, steps 220 to 224 in FIG. 7 may be executed to correct the transmission power level based on the W-CDMA modulated wave signal 24.
At this time, as described above, based on the operation information 26 notified from the W-CDMA modulation processing unit 12, the target period indicating that the W-CDMA modulated wave signal 24 is being transmitted is confirmed and detected in the target period. Since the difference value is calculated based on the measured power level value, even in the case of the W-CDMA system, variations and errors in the measured power level value can be suppressed, and the slope of the transmission frequency characteristic of the modulated wave signal can be detected accurately. can do.

  Further, in each embodiment, the case has been described as an example in which it is confirmed whether the W-CDMA modulated wave signal 24 is the target period when the OFDMA modulated wave signal 23 is not the target period. However, the present invention is not limited to this. When the W-CDMA modulated wave signal 24 is not in the target period, it may be confirmed whether the OFDMA modulated wave signal 23 is in the target period.

  The present invention modulates and transmits transmission data based on a frequency division multiplexing system using a plurality of carriers having different frequencies, such as a base station apparatus of a mobile phone system, and also a W-CDMA system and an LTE system, for example. The present invention can be widely applied to a wireless device using a wireless communication system.

  DESCRIPTION OF SYMBOLS 10 ... Wireless apparatus, 11 ... LTE modulation process part, 12 ... W-CDMA modulation process part, 13 ... Synthesizer, 14 ... Variable equalizer, 16 ... Amplifier, 17 ... Divider, 18 ... Detector, 19 ... Control part, 19A ... Transmission frequency characteristic correction unit, 19B ... Power level correction unit, 19M ... Storage unit, 21, 22 ... Transmission data, 23 ... OFDMA modulation wave signal, 24 ... W-CDMA modulation wave signal, 25, 26 ... Operation information, 27: Measurement results, 28, 29 ... Control signals.

Claims (7)

A modulation processing unit that modulates input transmission data based on a frequency division multiplexing method using a plurality of carrier waves having different frequencies, and generates a modulated wave signal;
A variable equalizer for adjusting a transmission frequency characteristic of the modulated wave signal generated by the modulation processing unit;
An amplifier for amplifying the modulated wave signal whose transmission frequency characteristic is adjusted by the variable equalizer;
A distributor for distributing the modulated wave signal amplified by the amplifier into two;
An antenna that wirelessly transmits one modulated wave signal distributed by the distributor;
A detector that detects the other modulated wave signal distributed by the distributor and measures the power levels of target carriers of two different frequencies among the carrier waves; and
For each of the target carriers, a difference value between the measured value of the power level and the set value of the power level is calculated, and based on the slope of the transmission frequency characteristic indicated by the comparison result comparing the magnitudes of the difference values A radio apparatus comprising: a control unit that corrects the transmission frequency characteristic by controlling a variable equalizer. The wireless device according to claim 1, wherein
The modulation processing unit generates the modulated wave signal composed of an OFDMA modulated wave signal by modulating the transmission data based on an OFDMA scheme,
The control unit is a target period in which the modulated wave signal is being transmitted and both of the two subcarriers allocated as the target carrier are not in a burst state based on the operation information notified from the modulation processing unit And each of the difference values is calculated based on a measured value of the power level of the subcarrier detected during the target period. The wireless device according to claim 1, wherein
The modulation processing unit modulates the transmission data based on a W-CDMA system,
Generating the modulated wave signal comprising a W-CDMA modulated wave signal;
The detector measures the power level of each phase reference signal included in the target carrier in the W-CDMA modulated wave signal when measuring the power level,
The control unit confirms a target period during which the modulated wave signal is transmitted based on the operation information notified from the modulation processing unit, and based on the measured value of the power level detected in the target period A wireless device characterized by calculating each difference value. The wireless device according to claim 1, wherein
A variable attenuator that adjusts the power level of the modulated wave signal whose transmission frequency characteristic is adjusted by the variable equalizer;
The amplifier amplifies the modulated wave signal whose power level is adjusted by the variable attenuator instead of the modulated wave signal whose transmission frequency characteristic is adjusted by the variable equalizer,
The control unit compares a measured value of one of the power levels with a set value of the power level, and controls the variable attenuator based on a power level difference indicated by the comparison result. A wireless device characterized by the above. The wireless device according to claim 1, wherein
The modulation processing unit modulates the transmission data based on an OFDMA scheme, and modulates the transmission data based on an OFDMA modulation processing unit that generates the modulated wave signal including an OFDMA modulated wave signal. A W-CDMA modulation processing unit that generates the modulated wave signal composed of a W-CDMA modulated wave signal,
A synthesizer that generates a modulated wave signal by combining the OFDMA modulated wave signal from the OFDMA modulation processing unit and the W-CDMA modulated wave signal from the W-CDMA modulation processing unit;
The variable equalizer adjusts the transmission frequency characteristic of the modulated wave signal generated by the combiner instead of the modulated wave signal generated by the modulation processing unit,
The detector detects the OFDMA modulated wave signal included in the other modulated wave signal, and determines the power levels of target carriers of two different frequencies among the subcarriers of the OFDMA modulated wave signal to be the carrier wave. Each of the signals is measured, and the W-CDMA modulated wave signal included in the other modulated wave signal is detected, and the target carrier having two different frequencies among the carriers of the W-CDMA modulated wave signal serving as the carrier wave is detected. Measure the power level of each included phase reference signal,
The control unit calculates, for each target carrier of the OFDMA modulated wave signal or the W-CDMA modulated wave signal, a difference value between the measured value of the power level and the set value of the power level. The wireless device, wherein the variable equalizer is controlled based on a slope of the transmission frequency characteristic indicated by a comparison result of magnitude comparison. The wireless device according to claim 5, wherein
The controller is
Based on the operation information notified from the modulation processing unit, a first target period in which the OFDMA modulated wave signal is being transmitted and both of the target carriers are not in a burst state is confirmed. A first difference calculation unit that calculates the difference value based on the measured value of the power level detected in the target period, and the W-CDMA modulated wave signal based on operation information notified from the modulation processing unit. Based on the measured value of the power level of the phase reference signal included in the target carrier wave of the W-CDMA modulated wave signal detected in the second target period. A second difference calculation unit for calculating each difference value,
When the OFDMA modulated wave signal is the first target period and the W-CDMA modulated wave signal is the second target period, either one of the first or second difference calculation unit Calculating the difference value;
When the OFDMA modulated wave signal is not the first target period and the W-CDMA modulated wave signal is the second target period, the second difference calculation unit calculates the difference value,
When the OFDMA modulated wave signal is the first target period and the W-CDMA modulated wave signal is not the second target period, the difference value is calculated by the first difference calculation unit,
The wireless apparatus, wherein the transmission frequency characteristic is not corrected when the OFDMA modulated wave signal is not in the first target period and the W-CDMA modulated wave signal is not in the second target period. A modulation processing step of modulating input transmission data based on a frequency division multiplexing method using a plurality of subcarriers to generate a modulated wave signal;
A transmission frequency characteristic adjusting step for adjusting a transmission frequency characteristic of the modulated wave signal generated by the modulation processing unit;
An amplification step for amplifying the modulated wave signal whose transmission frequency characteristic is adjusted in the transmission frequency characteristic adjustment step;
A distribution step of distributing the modulated wave signal amplified in the amplification step into two;
A wireless transmission step of wirelessly transmitting one modulated wave signal distributed in the distribution step from an antenna;
A detection step of detecting the other modulated wave signal distributed in the distribution step and measuring power levels of target carriers of two different frequencies among the subcarriers;
For each of the target carriers, a difference value between the measured value of the power level and the set value of the power level is calculated, and based on the slope of the transmission frequency characteristic indicated by the comparison result comparing the magnitudes of the difference values And a control step for controlling the adjustment in the transmission frequency characteristic adjustment step.

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