JP2006094043A - Transmission apparatus and communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To compensate distortions of a plurality of transmitting sections by using one feedback section. <P>SOLUTION: A distortion compensation arithmetic section 116 receives an output signal from a transmission data generating section 103 via a selection means 120. A signal distributor 109 partly extracts an output signal from the transmission apparatus 101 as a feedback signal. A feedback section 112 receives the feedback signal via an analog selection switch 111, converts the feedback signal into a digital signal which is given to the distortion compensation arithmetic section 116. The distortion compensation arithmetic section 116 compares the amplitude and the phase of the output signal from the transmission data generating section 103 with those of the feedback signal resulting from the output signal of the transmission apparatus 101 to obtain a compensation coefficient by applying arithmetic estimation to the distortion of an analog transmission circuit 107 according to, e.g. an LMS method. An amplitude/phase correction section 117 receives the obtained compensation coefficient via a selection means 119 and carries out the distortion compensation processing of a transmission signal. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a transmission device and a communication device having a plurality of transmission units.

  In general, in a transmission apparatus, a high power amplifier is used in an analog transmission circuit, so that a distortion occurs in a transmission signal to be amplified due to its nonlinear characteristics. One of the methods for compensating for the signal distortion generated in the analog transmission circuit is a feedback distortion compensation method (see, for example, Patent Document 1). This feedback distortion compensation method compares the amplitude and phase of the data signal generated by the baseband signal processing unit and the feedback signal output from the analog transmission circuit, and calculates and estimates the distortion of the analog transmission circuit to compensate for the distortion. There is a method of performing distortion compensation of an analog transmission circuit by creating a table (calculating a distortion compensation coefficient) and predistorting a data signal using the compensation table. The outline will be described below with reference to FIGS.

  FIG. 12 is a block diagram illustrating a configuration example of a transmission apparatus that implements a conventional feedback distortion compensation scheme. The transmission apparatus 1200 shown in FIG. 12 is configured to perform feedback distortion compensation. The transmission data generation unit 1201, the distortion compensation unit 1202 that receives the output of the transmission data generation unit 1201, and the digital signal that receives the output of the distortion compensation unit 1202. An analog converter (D / A) 1203, an analog transmission circuit 1204 that receives the output of the D / A 1203, a signal distributor 1205 that extracts a part of the transmission signal output from the analog transmission circuit 1204 to the antenna 1208, and signal distribution An analog receiver circuit 1206 that receives the branch output of the analog device 1205, and an analog / digital converter (A / D) 1207 that digitally converts the output of the analog receiver circuit 1206 and supplies the converted signal to the distortion compensation means 1202.

  FIG. 13 is a block diagram showing a configuration example of the distortion compensation unit 1202 shown in FIG. As shown in FIG. 13, the distortion compensation unit 1202 includes a distortion compensation calculation unit 1300 and an amplitude / phase correction unit 1301.

  In the above configuration, the data signal generated by the transmission data generation unit 1201 is output from the amplitude / phase correction unit 1301 in the distortion compensation unit 1202 as a distortion compensation signal. This distortion compensation signal is converted into an analog signal by the D / A 1203, and modulated / amplified by the analog transmission circuit 1204 to become a transmission signal. Most of the transmission signals are transmitted from the antenna 1208 to free space, but a part is extracted as a feedback signal by the signal distributor 1205. This feedback signal is amplified and demodulated by the analog reception circuit 1206, converted into a digital signal by the A / D 1207, and sent to the distortion compensation calculation unit 1300 in the distortion compensation means 1202 as an analog transmission circuit output signal shown in FIG. input.

  In the distortion compensation calculation unit 1300, the amplitude and phase of the data signal (generated data signal) generated by the transmission data generating unit 1201 and the analog transmission circuit output signal are compared, for example, the transmitted digital signal (generated data signal) And distortion compensation coefficient by calculating and estimating the distortion of the analog transmission circuit 1204 according to the LMS method (Least Mean Square: error minimization method) for calculating so that the square of the difference between the signal and the feedback digital signal (analog transmission circuit output signal) is reduced. Is obtained and given to the amplitude / phase correction unit 1301. The amplitude / phase correction unit 1301 operates the amplitude and phase of the data signal input from the transmission data generation unit 1201 on the basis of the distortion compensation coefficient given from the distortion compensation calculation unit 1300, and uses it as a distortion compensation signal. Output to A1203. In the feedback distortion compensation method, the above distortion compensation operation is repeated.

  In addition, a transmission apparatus that realizes an adaptive array antenna function includes a plurality of transmission units corresponding to a plurality of antennas. Here, when an adaptive array antenna is used, desired transmission directivity can be obtained by adjusting the amplitude and phase of each of the signals transmitted to the plurality of configured antennas. The amplitude and phase of the transmission signal can be easily adjusted, for example, by multiplying the transmission signal by a complex coefficient in the transmission data generation unit.

  However, the characteristics of the plurality of analog transmission circuits differ individually depending on the variation of the analog elements to be configured. Therefore, different unknown amplitude fluctuations and phase rotations are added to the transmission signals at the respective transmission output terminals, and directivity different from the transmission directivity set in the transmission data generation unit is formed. Furthermore, even if the amplitude characteristics and phase characteristics of all the transmission branches are adjusted to be constant, the temperature characteristics of the analog elements are different from each other. Will be added. Therefore, it is extremely difficult to accurately adjust the characteristics of an analog transmission circuit including an analog element so that it does not change in time or temperature.

  Therefore, the characteristics of the analog transmission circuit are not adjusted, and the characteristics of the analog transmission circuit are measured within the transmitter for each period during operation, and the amplitude and phase of the transmission signal are measured by the error of the characteristics. In consideration of the change of the background, a background calibration method for correcting the output signal of the transmission data generation unit is used (see Patent Document 2). With reference to FIG. 14, a transmission apparatus having a conventional background calibration function will be described.

  FIG. 14 is a block diagram illustrating a configuration example of a transmission apparatus having a conventional background calibration function. A transmission apparatus 1400 illustrated in FIG. 14 includes three transmission branches 1401, 1402, and 1403. A transmission data generation unit 1404 is connected to input ends of the transmission branches 1401, 1402, and 1403 via amplitude / phase correction units 1405, 1406, and 1407. Antennas 1408, 1409, and 1410 are connected to the output ends of the transmission branches 1401, 1402, and 1403, respectively.

  The three transmission branches 1401, 1402, and 1403 include digital / analog converters (D / A) 1411, 1412, and 1413 that receive outputs from the amplitude / phase correction units 1405, 1406, and 1407, and D / A 1411, 1412, and 1413, respectively. Analog transmission circuits 1414, 1415, 1416 that receive output, and signal distributors 1417, 1418, 1419 that extract a part of transmission signals that the analog transmission circuits 1414, 1415, 1416 send to the antennas 1408, 1409, 1410 are provided. Yes.

  Then, an analog signal selection switch 1420 that selects one of the branch outputs of the signal distributors 1417, 1418, and 1419, an analog reception circuit 1421 that receives the output of the analog signal selection switch 1420, and an output of the analog reception circuit 1421 An analog / digital converter (A / D) 1422 and a signal processing (measurement) unit 1423 that receives the output of the A / D 1422 are provided.

  The signal processing (measurement) unit 1423 includes an amplitude / phase comparison unit 1424 that receives the output of the A / D 1422, and a selection unit 1425 that selects and outputs the output of the amplitude / phase correction units 1405, 1406, and 1407 to the amplitude / phase comparison unit 1424. And a selection means 1426 that switches the output of the amplitude phase comparison unit 1424 and gives it to the amplitude / phase correction units 1405, 1406, and 1407.

  In the above configuration, the transmission data generation unit 1404 generates data signals to be given to the three transmission branches 1401, 1402, 1403 by, for example, multiplying the same data signal by individual complex coefficients. As a result, transmission directivity can be provided. Signals input to the transmission branches 1401, 1402, and 1403 via the amplitude / phase correction units 1405, 1406, and 1407 are converted into analog signals by the D / A 1411, 1412, and 1413, and the analog transmission circuits 1414, 1415, and 1416 are converted. Is modulated / amplified and transmitted from the antennas 1408, 1409, and 1410 to free space.

  Next, a case where the transmission branch 1401 is selected as a calibration target will be described. When the transmission branch 1401 is selected, the analog signal selection switch 1420 and the selection means 1425 and 1426 in the signal processing (measurement) unit 1423 operate so as to select the transmission branch 1401, respectively. The selection unit 1425 in the signal processing (measurement) unit 1423 selects a transmission signal input to the transmission branch 1401 and supplies the transmission signal to the amplitude / phase comparison unit 1424.

  The output signal of the transmission branch 1401 branched by the signal distributor 1417 is supplied to the amplitude / phase comparison unit 1424 in the signal processing (measurement) unit 1423 via the analog signal selection switch 1420, the analog reception circuit 1421, and the A / D 1422. Is input.

  In the amplitude / phase comparison unit 1424, an error is obtained from the set values of the amplitude and phase of both signals. The amplitude and phase errors obtained in this way correspond to the amplitude fluctuations and phase fluctuations generated by passing through the analog transmission circuit 1414. Therefore, the amplitude and phase correction unit is an error to cancel these fluctuations. A correction value is given to 1405. The amplitude / phase correction unit 1405 corrects the amplitude and phase of the transmission signal generated and output by the transmission data generation unit 1404 based on the correction value, and provides the transmission branch 1401 with the transmission signal.

In the transmission branches 1402 and 1403, the same correction can be performed by switching the analog signal selection switch 1420 and the selection means 1425 and 1426.
JP 2000-278190 A JP 2001-53527 A

  By the way, the conventional feedback distortion compensation method requires one analog reception circuit (feedback unit) for one transmission unit (transmission branch). For this reason, in a transmission apparatus having a plurality of transmission units, there are feedback units corresponding to the number of transmission branches. This increases the size of the apparatus and increases power consumption, resulting in a cost increase.

  In this type of transmission apparatus, frequency conversion (up-conversion) is performed using frequency conversion means such as a mixer. When the transmission unit includes frequency conversion means, in the feedback distortion compensation method, it is necessary that the feedback section also includes frequency conversion means to perform frequency conversion (down conversion) opposite to that of the transmission unit. As described above, when frequency conversion is performed in each of the transmission unit and the feedback unit, when the local signal input to the frequency conversion unit is different in each of the transmission unit and the feedback unit, the transmission unit is affected by the phase noise of the local signal. The output signal is not fed back with high accuracy, so that the distortion compensation effect is deteriorated.

  In addition, in a conventional transmission apparatus having a background calibration function, only an amplitude and phase error correction is performed using a feedback unit to improve the accuracy of the adaptive array antenna function. When a transmitter having a background calibration function is provided with a feedback distortion compensation function, a plurality of feedback units are required, resulting in an increase in the size of the apparatus and an increase in power consumption. was there.

  Further, when the signal processing unit used for the distortion compensation process and the background calibration process is shared, if the distortion compensated signal and the feedback signal are compared in the background calibration process, the distortion compensation process is performed. Since a part of the signal waveform due to is different from the output of the transmission data generation unit, there is a problem that the accuracy of phase amplitude measurement deteriorates.

  The present invention has been made in view of this point, and an object thereof is to provide a transmission device and a communication device that can perform distortion compensation of a plurality of transmission units using one feedback unit.

  It is another object of the present invention to provide a transmission device and a communication device in which the distortion compensation deterioration is small even when the transmission unit and the feedback unit each have frequency conversion means.

  It is another object of the present invention to provide a transmission device and a communication device that can share one feedback unit between a distortion compensation process and a background calibration function when having an adaptive array antenna function. .

  In addition, the present invention provides a transmission device and a communication device capable of suppressing deterioration in phase amplitude measurement accuracy when distortion compensation processing and background calibration processing are performed using one signal processing unit. Objective.

  In order to solve such a problem, a transmission apparatus according to the present invention includes a plurality of transmission units that perform analog conversion, modulation, and amplification on input transmission data to generate a transmission signal, and the same as the plurality of transmission units Transmission data generating means for generating a number of transmission data, a plurality of signal distribution means for extracting a part of transmission signals generated and output by each of the plurality of transmission means, and one signal selected from the plurality of signal distribution means A feedback signal generating means for generating a feedback signal by performing amplification, demodulation, and digital conversion on the partial transmission signal extracted by the distributing means; and a plurality of transmission data generated and output by the feedback signal and the transmission data generating means. Of these, distortion compensation calculation means for calculating a distortion compensation coefficient based on a comparison result of amplitude and phase with transmission data to be distortion compensated, and generated by the transmission data generation means A plurality of amplitude / phase correction means for applying distortion compensation processing based on the distortion compensation coefficient to transmission data to be compensated for distortion among transmission data to be input to a corresponding transmission means among the plurality of transmission means; The structure to comprise is taken.

  According to this configuration, it is possible to perform distortion compensation of a plurality of transmission units using one feedback signal generation unit. Therefore, when incorporating a feedback distortion compensation function in a transmission apparatus having a plurality of transmission units, It can be realized with low power consumption and low cost.

  The transmission apparatus according to the present invention is the transmission device according to the present invention described above, wherein the local signal used in the frequency conversion unit that performs modulation processing in each of the plurality of transmission units and the local signal used in the frequency conversion unit that performs demodulation processing in the feedback signal generation unit And a local signal oscillating means for commonly generating.

  According to this configuration, since the frequency conversion means in the plurality of transmission means and the frequency conversion means in the feedback signal generation means use the same local signal, distortion due to frequency fluctuations of the local signal input to the feedback signal generation means It is possible to suppress degradation of compensation and distortion compensation due to phase noise errors between the transmission unit and the feedback signal generation unit.

  In the transmitter according to the present invention, in the above invention, the plurality of transmitting units each include a local signal oscillating unit that generates a local signal used in a frequency converting unit that performs modulation processing. The local signal generating means included in one of the above is configured to include a local selecting means for selecting a local signal generated by the frequency converting means for performing demodulation processing by the feedback signal generating means.

  According to this configuration, when the frequency conversion means in the plurality of transmission means each include local oscillation means, the local signal of the frequency conversion means in the feedback signal generation means can be the same as the local signal in the transmission means. Therefore, it is possible to suppress distortion compensation deterioration due to frequency fluctuation of the local signal input to the feedback signal generation means and distortion compensation deterioration due to a phase noise error between the transmission means and the feedback signal generation means.

  The transmission device according to the present invention is the transmission device according to the present invention, wherein the amplitude and phase generated in the corresponding transmission unit based on the feedback signal and transmission data to be corrected among the transmission data input to the plurality of transmission units. In this case, an amplitude phase comparison unit is provided that measures the error in step S3 and applies the measurement result to the corresponding amplitude / phase correction unit to perform correction processing.

  According to this configuration, it is possible to perform feedback distortion compensation function processing and background calibration processing using a common feedback signal. Therefore, when the feedback distortion compensation function and the background calibration function are incorporated into a transmission apparatus having a plurality of transmission units, it can be realized with a small size, low power consumption, and low cost. Also, since the frequency conversion means in the plurality of transmission means and the frequency conversion means in the feedback signal generation means can use the same local signal, distortion compensation due to frequency fluctuations of the local signal input to the feedback signal generation means Degradation of distortion compensation due to phase noise error between the transmission means and feedback signal generation means, and at the same time suppress degradation of background calibration accuracy due to phase noise error between the transmission means and feedback signal generation means can do.

  The transmission device according to the present invention is the transmission device according to the above aspect, wherein the amplitude and phase generated in the corresponding transmission unit based on the feedback signal and transmission data to be corrected among the transmission data generated and output by the transmission data generation unit. And an amplitude / phase comparison unit that performs error correction processing by supplying the measurement result to the corresponding amplitude / phase correction unit.

  According to this configuration, when the feedback distortion compensation function process and the background calibration function process are performed using a common feedback signal, in the background calibration process, the signal before the distortion compensation process and the feedback signal are Since the comparison is made, it is possible to suppress the deterioration of the phase amplitude measurement accuracy.

  A communication apparatus according to the present invention includes a transmission apparatus according to the above invention, a plurality of reception apparatuses, a transmission signal output terminal of a plurality of signal distribution means included in the transmission apparatus, and a reception signal input terminal of the plurality of reception apparatuses. A configuration comprising a plurality of antenna sharing means connected to corresponding antennas is adopted.

  According to this configuration, a communication apparatus having low distortion transmission characteristics and a high-precision transmission adaptive array antenna function can be realized with a small size, low power consumption, and low cost.

  The communication apparatus according to the present invention employs a configuration in which, in the above-described invention, the plurality of signal distribution units included in the transmission apparatus are relocated between the plurality of antenna sharing units and the corresponding antenna.

  According to this configuration, it is possible to correct the amplitude and phase of all transmission systems of the communication apparatus, and it is possible to improve the accuracy of the adaptive array antenna function.

  A transmission apparatus according to the present invention generates a transmission signal by performing analog conversion, modulation, and amplification on input transmission data, and generates the same number of transmission data as the plurality of transmission means Transmission data generating means, combining means for combining the transmission signals generated and output by the plurality of transmitting means, signal distributing means for extracting a part of the transmission signal combined and output by the combining means, and the signal distributing means for extracting Feedback signal generating means for generating a feedback signal by performing amplification, demodulation, and digital conversion processing on a part of the transmission signal, and distortion compensation among a plurality of transmission data generated and output by the feedback signal and the transmission data generating means. Distortion compensation calculation means for calculating a distortion compensation coefficient based on the comparison result of amplitude and phase with the target transmission data, and transmission data generated and output by the transmission data generation means. A plurality of amplitude / phase correction means for performing distortion compensation processing based on the distortion compensation coefficient on transmission data to be subjected to distortion compensation in the data and inputting the transmission data to corresponding transmission means among the plurality of transmission means. take.

  According to this configuration, only one signal distribution unit is required, and therefore the selection unit in the case where there are a plurality of signal distribution units is not required, so that the configuration can be simplified.

  According to the present invention, when a feedback distortion compensation function is incorporated into a transmission apparatus having a plurality of transmission means, and when a background calibration function is further incorporated, it can be realized with small size, low power consumption, and low cost. it can.

  The gist of the present invention is to realize feedback distortion compensation for a plurality of transmission units using only one feedback unit. At this time, the local signal of the frequency conversion means included in each of the transmission unit and the feedback unit is made the same so as to reduce deterioration of distortion compensation.

  In addition, the gist of the present invention is to allow one feedback unit to be shared by the distortion compensation processing and the background calibration function when having an adaptive array antenna function. At this time, when distortion compensation processing and background calibration processing are performed using one signal processing unit, deterioration of phase amplitude measurement accuracy is suppressed.

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

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a transmission apparatus according to Embodiment 1 of the present invention. The transmission apparatus 100 illustrated in FIG. 1 includes two transmission units 101 and 102 as a minimum configuration. The transmission units 101 and 102 receive the transmission data generation units 103 and 104 that generate transmission data and the output of the transmission data generation units 103 and 104 via the amplitude / phase correction units 117 and 118 in the signal processing unit 115. Digital / analog converters (D / A) 105 and 106 for analog conversion, and analog transmission circuits 107 and 108 for generating transmission signals by modulating and amplifying the outputs of the D / A 105 and 106 are provided. In the case of a device having an adaptive array antenna function, the transmission data generation units 103 and 104 operate the phase and amplitude of the data signal sent to the corresponding analog transmission circuit.

  Connected between the output terminals of the transmission units 101 and 102 and the output terminals 125 and 126 are signal distributors 109 and 110 for extracting a part of transmission signals transmitted from the analog transmission circuits 107 and 108. The feedback path includes an analog signal selection switch 111 that selects a branch output of the signal distributors 109 and 110, and a feedback unit 112 that receives a selection output of the analog signal selection switch 111 and provides a feedback signal to the signal processing unit 115. Is provided.

  The feedback unit 112 receives the selection output of the analog signal selection switch 111 and amplifies / demodulates the analog reception circuit 113, and the analog / digital converter that digitally converts the output of the analog reception circuit 113 and supplies the digital signal to the signal processing unit 115 (A / D) 114.

  The signal processing unit 115 switches the output of the distortion compensation calculation unit 116 that receives the output of the A / D 114, the amplitude / phase correction units 117 and 118, and the distortion compensation calculation unit 116, and the amplitude / phase correction units 117 and 118. Selection means 119 for selection and input means for the amplitude / phase correction sections 117 and 118 (output data of the transmission data generation sections 103 and 104 in the transmission sections 101 and 102) and selection means for selection to the distortion compensation calculation section 116 120.

  Next, the distortion compensation operation performed in transmission apparatus 100 according to Embodiment 1 configured as described above will be described. Here, a case where the transmission unit 101 is selected as a distortion compensation target will be described. When the transmission unit 101 is selected as a distortion compensation target, the analog signal selection switch 111 and the selection units 119 and 120 in the signal processing unit 115 operate to select the transmission unit 101, respectively.

  The output signal of the transmission data generation unit 103 is input to the distortion compensation calculation unit 116 in the signal processing unit 115 via the selection unit 120. Part of the output signal of the transmission unit 101 is extracted by the signal distributor 109 and input to the feedback unit 112 via the analog selection switch 111. In the feedback unit 112, the input feedback analog signal is amplified and demodulated by the analog reception circuit 113, adjusted to an optimum signal state suitable for the input range of the A / D 114, and input to the A / D 114. Converted into a digital signal. The analog receiving circuit 113 is configured not to generate distortion components. The feedback digital signal output from the feedback unit 112 is input to the distortion compensation calculation unit 116 in the signal processing unit 115.

  In the distortion compensation calculation unit 116 in the signal processing unit 115, the amplitude of the output data signal of the transmission data generation unit 103 selected by the selection unit 120 and the feedback digital signal for the output signal of the transmission unit 101 input from the feedback unit 112. And the phase is compared, and the distortion generated in the analog transmission circuit 107 is calculated and estimated in accordance with, for example, the LMS method (error minimization method) to obtain the compensation value. The compensation value obtained by the distortion compensation calculation unit 116 is given to the amplitude / phase correction unit 117 via the selection unit 119. The amplitude / phase correction unit 117 performs distortion compensation processing on the output data signal of the transmission data generation unit 103 using the compensation value input from the selection unit 119. The transmission signal subjected to distortion compensation processing in this way is input to the analog transmission circuit 107 via the D / A 105.

  The transmission unit 102 also performs distortion compensation processing similar to the above by switching the analog signal selection switch 111 and the control means 119 and 120. In other words, the transmission apparatus 100 can perform distortion compensation for all the transmission units by alternately repeating the distortion compensation processing between the transmission unit 101 and the transmission unit 102.

  FIG. 1 shows a configuration in which a transmission data generation unit is provided for each of a plurality of transmission units. However, one transmission data generation unit is provided in each analog transmission circuit within the transmission data generation unit. Each data signal to be sent may be generated and sent. At this time, in the case of a device having an adaptive array antenna function, the configuration is such that the phase and amplitude of the data signal sent to each analog transmission circuit is manipulated inside one transmission data generation unit. When the transmission apparatus has a transmission power control (TPC) function, the compensation value generally differs for each TPC control value. In this case, a compensation table for recording the compensation value of each TPC control value is provided, and the same effect can be obtained as a method for updating the compensation table. In addition, the same effect can be obtained even when the distortion characteristic operation of the (final stage) amplifier of the analog transmission circuit is used in combination as a distortion compensation and efficiency improvement method. For example, when the final stage amplifier is an FET, the distortion characteristics can be changed by controlling the drain current. When there is no signal distortion degradation, the power consumption can be reduced by reducing the drain current of the amplifier (final stage) and performing distortion compensation.

  As described above, according to Embodiment 1, distortion compensation processing for a plurality of transmission units can be performed by sharing one feedback unit, so that feedback distortion compensation is performed in a transmission apparatus having a plurality of transmission units. When the function is incorporated, it can be realized with small size, low power consumption, and low cost.

(Embodiment 2)
FIG. 2 is a block diagram showing the configuration of the transmission apparatus according to Embodiment 2 of the present invention. In FIG. 2, the same reference numerals are given to components that are the same as or equivalent to the components shown in FIG. 1 (Embodiment 1). Here, the description will focus on the parts related to the second embodiment.

  In the second embodiment, a configuration example in which the number of data bits and the sampling frequency are different among a plurality of transmission units is shown. That is, in the transmission apparatus 200 shown in FIG. 2, the transmission unit 101 and the transmission unit 102 belong to different systems, and the transmission data generated by the transmission data generation units 103 and 104 has different data bit numbers and sampling frequencies. ing. In such a case, the feedback unit 112 shown in FIG. 1 has one analog / digital converter, and the signal processing unit 115 has one distortion compensation calculation unit. May be difficult.

  Therefore, as shown in FIG. 2, in the feedback unit 112, A / D 114 a and 114 b are provided in parallel instead of the A / D 114. Further, the signal processing unit 115 deletes the selection means 119 and 120 and replaces the distortion compensation calculation unit 116 with the distortion compensation calculation unit 116a for the amplitude / phase correction unit 117 and the distortion for the amplitude / phase correction unit 118. Compensation calculation unit 116b is provided. A switch 201 for connecting the feedback signal input terminal of the distortion compensation calculation unit 116a to the output terminal of the A / D 114a is provided, and a switch 202 for connecting the feedback signal input terminal of the distortion compensation calculation unit 116b to the output terminal of the A / D 114b. Provide.

  When the analog signal selection switch 111 selects the branch output of the signal distributor 109, that is, the transmission signal of the transmission unit 101, the switch 201 closes and inputs the feedback digital signal output from the A / D 114a to the distortion compensation calculation unit 116a. Let At this time, the switch 202 is open.

  The switch 202 closes the feedback digital signal output from the A / D 114b when the analog signal selection switch 111 selects the branch output of the signal distributor 110, that is, the transmission signal of the transmission unit 102, and the distortion compensation calculation unit 116b. To input. At this time, the switch 201 is open.

  With this configuration, even when the transmission unit 101 and the transmission unit 102 differ in the number of data bits used for generating the transmission signal and the sampling frequency, distortion compensation of both transmission units is possible.

  Therefore, according to the second embodiment, even when the number of data bits and the sampling frequency are different among the plurality of transmission units, similarly to the first embodiment, the distortion of the plurality of transmission units is achieved using one feedback unit. Compensation can be performed, and downsizing, low power consumption, and low cost of the apparatus can be realized.

(Embodiment 3)
FIG. 3 is a block diagram showing a configuration of a transmission apparatus according to Embodiment 3 of the present invention. In FIG. 3, the same reference numerals are given to components that are the same as or equivalent to those shown in FIG. 1 (Embodiment 1). Here, the description will be focused on the portion related to the third embodiment.

  In the third embodiment, a configuration example is shown in which transmission signals handled by a plurality of transmission units are composed of I signals (in-phase component signals) and Q signals (quadrature component signals). In other words, in the transmission apparatus 300 shown in FIG. 3, the transmission data generated by the transmission data generation units 103 and 104 includes an I signal (in-phase component signal) and a Q signal (quadrature component signal). In this case, the signal processing unit 115 individually performs distortion compensation processing on the I signal (in-phase component signal) and the Q signal (quadrature component signal).

  Therefore, the transmission unit 101 is provided with a D / A 105a for an I signal (in-phase component signal) and a D / A 105b for a Q signal (quadrature component signal) instead of the D / A 105. Then, the analog transmission circuit 107 multiplies the output of the D / A 105a and the output of the D / A 105b to convert it into one transmission signal, and amplifies the transmission signal output from the orthogonal modulator 301. And an analog device 302 that transmits the signal to the signal distributor 109.

  In addition, the transmission unit 102 is provided with a D / A 106a for an I signal (in-phase component signal) and a D / A 106b for a Q signal (quadrature component signal) instead of the D / A 106. Then, the analog transmission circuit 108 multiplies the output of the D / A 106a and the output of the D / A 106b to convert it into one transmission signal, and amplifies the transmission signal output from the orthogonal modulator 303. And an analog device 304 that transmits the signal to the signal distributor 110.

  In the feedback unit 112 that receives the selection output of the analog signal selection switch 111, the analog reception circuit 113, the analog device 306 that amplifies the selection output of the analog signal selection switch 111, etc., and the output signal of the analog device 306 as an I signal (in-phase component) Signal) and Q signal (orthogonal component signal). Then, instead of A / D 114 receiving the output of analog receiving circuit 113, A / D 114a for I signal (in-phase component signal) output from quadrature demodulator 307 and Q signal (quadrature component) output from quadrature demodulator 307 Signal) A / D 114b. Output digital signals from the A / Ds 114 a and 114 b are input to the distortion compensation calculation unit 116. The distortion compensation calculation unit 116 can calculate and calculate a distortion compensation value for each of the I signal (in-phase component signal) and the Q signal (quadrature component signal).

  With this configuration, even when the transmission data generation units 103 and 104 generate an I signal (in-phase component signal) and a Q signal (quadrature component signal), it is possible to compensate for distortion in both transmission units.

  Therefore, according to the third embodiment, even when the transmission signal handled by each of the plurality of transmission units is composed of an I signal (in-phase component signal) and a Q signal (quadrature component signal), as in the first embodiment. Distortion compensation of a plurality of transmission units can be performed using a single feedback unit, and downsizing, low power consumption, and low cost of the apparatus can be realized.

(Embodiment 4)
FIG. 4 is a block diagram showing a configuration of a transmission apparatus according to Embodiment 4 of the present invention. In FIG. 4, the same or similar components as those shown in FIG. 1 (Embodiment 1) are denoted by the same reference numerals. Here, the description will be focused on the portion related to the fourth embodiment.

  In the fourth embodiment, an example of a method for supplying a local signal to the frequency conversion means included in each of a plurality of transmission units and one feedback unit is shown. That is, the transmission apparatus 400 illustrated in FIG. 4 includes a common local oscillator 401. Then, the analog transmission circuit 107 multiplies the output of the gain control means (ATT) 402 for adjusting the output level of the D / A 105, the output of the gain control means (ATT) 402 and the output of the local oscillator 401, and converts the frequency (up). Frequency conversion means (upconverter) 403 for conversion, a high-frequency amplifier 404 that receives the output of the up-converter 403, and a filter 405 that performs band limitation processing on the output of the high-frequency amplifier 404 and sends it to the signal distributor 109. Yes.

  Further, the analog transmission circuit 108 multiplies the output of the gain control means (ATT) 406 for adjusting the output level of the D / A 106, the output of the gain control means (ATT) 406, and the output of the local oscillator 401, thereby converting the frequency (up). Frequency conversion means (upconverter) 407 for conversion, a high frequency amplifier 408 that receives the output of the up converter 407, and a filter 409 that performs band limitation processing on the output of the high frequency amplifier 408 and sends the output to the signal distributor 110. Yes.

  The analog reception circuit 113 of the feedback unit 112 includes a frequency conversion unit (down converter) 410 that performs frequency conversion (down conversion) by multiplying the selection output of the analog signal selection switch 111 and the output of the local oscillator 401, and a down converter. A filter 411 that performs band limitation processing on the output of 410 and a gain control means (ATT) 412 that adjusts the output level of the filter 411 and outputs the adjusted signal to the A / D 114 are provided.

  Here, when the local signal input to the up-converters 403 and 407 of the transmission units 101 and 102 and the local signal input to the down-converter 410 of the feedback unit 112 are different, the signal output from the feedback unit 112 Is different from the output signal frequency of the transmission data generation units 103 and 104, the accuracy of the compensation value calculated by the distortion compensation calculation unit 116 is deteriorated.

  Further, a PLL synthesizer is used for the local oscillator that outputs the local signal input to the up-converters 403 and 407 of the transmission units 101 and 102 and the local oscillator that outputs the local signal input to the down-converter 410 of the feedback unit 112. Even when the same reference clock is used, the local signals output from both oscillators have different phase noises. Therefore, the frequency of the signal output from the feedback unit 112 is the same as the output signal frequency of the transmission data generating units 103 and 104. Will be slightly different. Therefore, also in this case, the accuracy of the compensation value calculated by the distortion compensation calculation unit 116 deteriorates.

  However, in the fourth embodiment, as shown in FIG. 4, the plurality of transmission units 101 and 102 and the feedback unit 112 perform frequency conversion using the output signal of the same local oscillator 401, so that the feedback unit The output signal 112 includes the same frequency component as the output signals of the transmission data generation units 103 and 104.

  In other words, even when the signals are distorted in the analog transmission circuits 107 and 108, the amplitude of the transmission data and the addition of harmonic frequency components are caused by the signal distortion in the analog device, but the frequency of the transmission data does not change. The same frequency component is obtained in the signal. When the analog transmission circuits 107 and 108 do not distort the signal, the transmission unit input signal frequency and the feedback unit output signal frequency are the same.

  As described above, according to the fourth embodiment, since the plurality of transmission units and one feedback unit perform frequency conversion using the local signal from the same local oscillator, the feedback unit changes the analog transmission output signal. Therefore, it is possible to feed back to the distortion compensation calculation unit without any distortion and to perform the distortion compensation processing with high accuracy.

  In the fourth embodiment, an example of application to the first embodiment is shown. Needless to say, the present invention can also be applied to the second and third embodiments.

(Embodiment 5)
FIG. 5 is a block diagram showing a configuration of a transmission apparatus according to Embodiment 5 of the present invention. In FIG. 5, the same or similar components as those shown in FIG. 4 (Embodiment 4) are denoted by the same reference numerals. Here, the description will be focused on the portion related to the fifth embodiment.

  In the fifth embodiment, another example of a method for supplying a local signal to the frequency conversion means included in each of a plurality of transmission units and one feedback unit is shown.

  That is, in the transmission device 500 illustrated in FIG. 5, the analog transmission circuit 107 of the transmission unit 101 includes the local oscillator 501, and the analog transmission circuit 108 of the transmission unit 102 includes the local oscillator 502. Then, either the output of the local oscillator 501 or the output of the local oscillator 502 is selected by the local signal selection switch 503, and this is used as the local signal of the down converter 410 of the feedback unit 112.

  When the analog signal selection switch 111 selects the branch output of the signal distributor 109, that is, the transmission signal of the transmission unit 101, the local signal selection switch 503 selects the output of the local oscillator 501 and the analog signal selection switch 111 selects the signal. When selecting the branch output of the distributor 110, that is, the transmission signal of the transmission unit 102, the output of the local oscillator 502 is selected.

  Thus, even when the plurality of transmission units 101 and 102 have frequency conversion units having different local frequencies, the local signal selection switch 503 transmits the local signal input to the frequency conversion unit of the feedback unit 112 for distortion compensation processing. Can be the same as the part.

  Therefore, according to the fifth embodiment, the plurality of transmission units use different local frequencies, but one feedback unit uses the same local frequency as the transmission unit that performs distortion compensation. The feedback unit can feed back the analog transmission output signal to the distortion compensation calculation unit without changing it, and the distortion compensation processing can be performed with high accuracy.

(Embodiment 6)
FIG. 6 is a block diagram showing a configuration of a transmission apparatus according to Embodiment 6 of the present invention. In FIG. 6, components that are the same as or equivalent to the components shown in FIG. 1 (Embodiment 1) are assigned the same reference numerals. Here, the description will focus on the parts related to the sixth embodiment.

  In the sixth embodiment, a configuration example in the case where distortion compensation processing and background calibration processing are performed using one feedback unit is shown. That is, the transmission apparatus 600 shown in FIG. 6 has the configuration shown in FIG. 1 (Embodiment 1) in which an amplitude / phase comparison unit 601 and selection means 602 and 603 are added to the signal processing unit 115.

  In FIG. 6, the output signal of the feedback unit 112 is input to both the distortion compensation calculation unit 116 and the amplitude / phase comparison unit 601. The selection means 602 is connected so as to give the output signal of the amplitude / phase comparison unit 601 to one of the amplitude / phase correction units 117 and 118. The selection means 603 is connected to select one of the output signals of the amplitude / phase correction units 117 and 118 and input the selected signal to the amplitude / phase comparison unit 601. The amplitude / phase comparison unit 601 calculates an error from the set values of the amplitude and phase of the two input signals.

  According to this configuration, a single feedback unit 112 is used to increase the accuracy of the distortion compensation processing of the plurality of transmission units 101 and 102 and the adaptive array antenna function performed using the plurality of transmission units 101 and 102. Background calibration processing can be realized.

  The distortion compensation process and the background calibration process using one feedback unit 112 according to the sixth embodiment are performed as follows. Here, a case where the transmission unit 101 is selected as an object for distortion compensation and background calibration will be described. When the transmission unit 101 is selected, the analog signal selection switch 111 and the selection means 119, 120, 602, and 603 in the signal processing unit 115 operate to select the transmission unit 101, respectively.

  In the distortion compensation calculation unit 116, as in the first embodiment, the amplitude and phase of the output signal of the transmission data generation unit 103 and the feedback signal of the output signal of the transmission unit 101 are compared, for example, an LMS method (error According to the minimization method, the distortion of the analog transmission circuit 107 is calculated and estimated to obtain a compensation value. The compensation value obtained by the distortion compensation calculation unit 116 is given to the amplitude / phase correction unit 117 via the selection unit 119, and the amplitude / phase correction unit 117 performs distortion compensation processing on the transmission signal of the analog transmission circuit 107. Is done.

  In the amplitude / phase comparison unit 601, an error from the set values of the amplitude and phase between the transmission signal input to the D / A 105 and the output signal of the feedback unit 112 is obtained. The amplitude and phase errors obtained in this way correspond to the amplitude fluctuations and phase fluctuations generated by passing through the analog transmission circuit 107. Therefore, the amplitude / phase correction is performed as an error to cancel these fluctuations. A correction value is given to the unit 117 via the selection means 602. By performing this process for all the transmission units, it is possible to correct phase and amplitude errors generated in the analog transmission circuit between the transmission units.

  As described above, according to the sixth embodiment, it is possible to accurately perform the distortion compensation process and the background calibration process for a plurality of transmission units using one feedback unit. A transmitter having a feedback distortion compensation function and a background calibration function can be realized with a small size, low power consumption, and low cost.

  In the sixth embodiment, an example of application to the first embodiment is shown. Needless to say, the present invention can be similarly applied to the second and third embodiments. Also, when the distortion characteristics and the efficiency improvement method are used together with the operation of the distortion characteristics of the (final stage) amplifier of the analog transmission circuit, the output amount and phase amount may change with the operation, but the background calibration function There is no problem because it is compensated by.

(Embodiment 7)
FIG. 7 is a block diagram showing a configuration of a transmission apparatus according to Embodiment 7 of the present invention. In FIG. 7, the same reference numerals are given to components that are the same as or equivalent to those shown in FIG. 4 (Embodiment 4). Here, the description will be focused on the portion related to the seventh embodiment.

  In the seventh embodiment, as in the fourth embodiment, when a common local signal is supplied to the frequency conversion means included in each of the plurality of transmission units and one feedback unit, the background calibration is performed together with the distortion compensation processing. A configuration example in which processing is also performed is shown.

  That is, the transmission apparatus 700 illustrated in FIG. 7 includes an amplitude / phase comparison unit 701 and selection units 702 and 703 in the signal processing unit 115. This is the same as the element added to the signal processing unit 115 in the sixth embodiment.

  According to this configuration, since the operation described in the sixth embodiment is performed in the same manner, even when a common local signal is supplied to the frequency conversion units respectively included in the plurality of transmission units and one feedback unit, 1 Since it is possible to accurately perform distortion compensation processing and background calibration processing for a plurality of transmission units using two feedback units, the feedback type distortion compensation function and the background calibration function are provided. The transmitting apparatus can be realized with a small size, low power consumption, and low cost.

  In the seventh embodiment, an application example to the fourth embodiment is shown, but it goes without saying that the present embodiment can be similarly applied to the fifth embodiment.

(Embodiment 8)
FIG. 8 is a block diagram showing a configuration of a transmission apparatus according to Embodiment 8 of the present invention. In FIG. 8, components that are the same as or equivalent to the components shown in FIG. 1 (Embodiment 1) are given the same reference numerals. Here, the description will focus on the parts related to the eighth embodiment.

  In the eighth embodiment, there is shown a configuration example for suppressing deterioration of phase amplitude measurement accuracy in the background calibration process when the distortion compensation process and the background calibration process are performed using one feedback unit. Yes. That is, in transmitting apparatus 800 shown in FIG. 8, in the configuration shown in FIG. 1 (Embodiment 1), amplitude / phase comparison section 801 and selection means 802 are added to signal processing section 115.

  In FIG. 8, the output signal of the feedback unit 112 is input to both the distortion compensation calculation unit 116 and the amplitude / phase comparison unit 801. In addition, an input signal of either the amplitude / phase correction unit 117 or 118 is input to both the distortion calculation unit 116 and the amplitude / phase comparison unit 801 via the selection unit 120. The selection means 802 is connected so as to give the output signal of the amplitude / phase comparison unit 801 to one of the amplitude / phase correction units 117 and 118. In the amplitude phase comparison unit 801, the amplitude and phase set values of the input signal (that is, the signal before distortion compensation processing) of one of the amplitude / phase correction units 117 and 118 input via the selection unit 120 and the feedback signal are used. Error is required.

  In this configuration, similarly to the sixth embodiment, a single feedback unit 112 is used to perform distortion compensation processing of the plurality of transmission units 101 and 102 and an adaptive array antenna that is performed using the plurality of transmission units 101 and 102. It is possible to realize a background calibration process for improving the function accuracy.

  The distortion compensation process and the background calibration process using one feedback unit 112 according to the eighth embodiment are performed as follows. Here, a case where the transmission unit 101 is selected as an object for distortion compensation and background calibration will be described. When the transmission unit 101 is selected, the analog signal selection switch 111 and the selection means 119, 120, and 802 in the signal processing unit 115 operate to select the transmission unit 101, respectively.

  In the distortion compensation calculation unit 116, as in the first embodiment, the amplitude and phase of the output signal of the transmission data generation unit 103 and the feedback signal of the output signal of the transmission unit 101 are compared with set values, for example, an LMS method. According to (error minimization method), the distortion of the analog transmission circuit 107 is calculated and estimated to obtain a compensation value. The compensation value obtained by the distortion compensation calculation unit 116 is given to the amplitude / phase correction unit 117 via the selection unit 119, and the amplitude / phase correction unit 117 performs distortion compensation processing on the transmission signal of the analog transmission circuit 107. Is done.

  The amplitude / phase comparison unit 801 compares the amplitude and phase of the output signal of the transmission data generation unit 103 (that is, the signal before distortion compensation processing) and the feedback signal of the output signal of the transmission unit 101 with a set value to determine an error. It is done. The amplitude and phase errors obtained in this way correspond to the amplitude fluctuations and phase fluctuations generated by passing through the analog transmission circuit 107. Therefore, the amplitude / phase correction is performed as an error to cancel these fluctuations. A correction value is given to the unit 117 via the selection means 802. By performing this process for all the transmission units, it is possible to correct phase and amplitude errors generated in the analog transmission circuit between the transmission units.

  Here, in the background calibration process, in the method of comparing the output signal of the amplitude / phase correction unit and the feedback signal shown in the sixth embodiment, a part of the signal waveform is generated as transmission data by the distortion compensation process. Therefore, there is a problem that the accuracy of phase amplitude measurement is deteriorated because it is different from the output of the unit.

  Further, in the method of comparing the output signal of the amplitude / phase correction unit and the feedback signal, when the amplitude and phase of the entire transmission signal change depending on the content of the distortion compensation processing, the correction amount of the amplitude and phase of the background calibration processing is used. In addition, since the amount of change in amplitude and phase in the distortion compensation processing is added, an accurate phase shift amount cannot be obtained at the output end.

  For this reason, in the method of comparing the output signal of the amplitude / phase correction unit and the feedback signal, when the amplitude and phase of the entire transmission signal change depending on the content of the distortion compensation process, the background calibration process uses the distortion compensation process. It is necessary to operate so as to obtain the correction amount of the amplitude and phase including the change amount, and there is a problem that the processing system becomes complicated.

  However, in the eighth embodiment, in the background calibration process by the amplitude / phase comparison unit 801, the correction value is obtained by comparing the signal before the distortion compensation process and the feedback signal, so that deterioration of the phase amplitude measurement accuracy is suppressed. In addition, the processing system is not complicated as described above.

  Thus, according to the eighth embodiment, as in the sixth embodiment, a single feedback unit is used to accurately perform distortion compensation processing and background calibration processing for a plurality of transmission units. Therefore, a transmission device having a feedback distortion compensation function and a background calibration function can be realized with a small size, low power consumption, and low cost.

  In addition, in the background calibration process, since the correction value is obtained by comparing the signal before the distortion compensation process and the feedback signal, deterioration of the phase amplitude measurement accuracy can be suppressed.

(Embodiment 9)
FIG. 9 is a block diagram showing a configuration of a communication apparatus according to Embodiment 9 of the present invention. In FIG. 9, the same reference numerals are given to the same or equivalent components as those shown in FIG. 1 (Embodiment 1). Here, the description will be focused on the portion related to the ninth embodiment.

  A communication apparatus 900 illustrated in FIG. 9 includes a transmission apparatus 100 including the two transmission units 101 and 102 described in Embodiment 1, a multi-input reception apparatus 903 including two reception apparatuses 901 and 902, and a transmission unit 101. And an antenna duplexer 904 for the receiver 901, and an antenna duplexer 905 for the transmitter 102 and the receiver 902. An antenna 906 is connected to the antenna duplexer 904, and an antenna 907 is connected to the antenna duplexer 905.

  The antennas 906 and 907 operate so as to change the output signal of the transmission device 100 into a radio wave and input the received radio wave to the reception device 903. The antenna duplexers 904 and 905 operate so that the output signal of the transmission apparatus 100 is input to the antennas 906 and 907 and not input to the reception apparatus 903. Similarly, the reception signals from the antennas 906 and 907 are input to the reception device 903 and operate so as not to be input to the transmission device 100. The receiving apparatuses 901 and 902 operate so as to perform reception processing by demodulating received signals from the antennas 906 and 907.

  Thus, according to the ninth embodiment, by incorporating the transmission device shown in the first embodiment into a communication device, a communication device having low distortion transmission characteristics and a high-precision transmission adaptive array antenna function is provided. It can be realized with small size, low power consumption and low cost.

  In addition, although the application example to Embodiment 1 is shown in this Embodiment 9, it cannot be overemphasized that it can apply similarly to Embodiment 2-8 similarly.

(Embodiment 10)
FIG. 10 is a block diagram showing a configuration of a communication apparatus according to Embodiment 10 of the present invention. In FIG. 10, components that are the same as or equivalent to the components shown in FIG. 9 (Embodiment 9) are assigned the same reference numerals. Here, the description will be focused on the portion related to the tenth embodiment.

  In communication apparatus 1000 shown in FIG. 10, signal distributors 109 and 110 are connected between antenna duplexers 904 and 905 and antennas 906 and 907 in the configuration shown in FIG. 9 (Embodiment 9).

  According to this configuration, since the signal distributors 109 and 110 are on the antenna input / output side of the antenna duplexers 904 and 905, a communication apparatus including phase fluctuations in the antenna duplexers 904 and 905 during the background calibration process. It is possible to correct the entire transmission system.

  As described above, according to the tenth embodiment, since the signal distributors 109 and 110 are arranged between the duplexers 904 and 905 and the antennas 906 and 907, the phase correction of all the transmission systems in the communication apparatus is performed. Thus, the accuracy of the adaptive array antenna function can be improved.

(Embodiment 11)
FIG.11 is a block diagram showing the configuration of the transmission apparatus according to Embodiment 11 of the present invention. In FIG. 11, the same reference numerals are given to components that are the same as or equivalent to the components shown in FIG. 1 (Embodiment 1). Here, the description will focus on the parts related to the eleventh embodiment.

  In the configuration shown in FIG. 11, transmission apparatus 1100 shown in FIG. 11 deletes signal distributors 109 and 110 in the configuration shown in FIG. 1 (Embodiment 1), and connects the output terminals of transmission sections 101 and 102 to synthesizer 1101. One transmission signal is output from the combiner 1101. A signal distributor 1102 is connected to the output terminal of the combiner 1101, and a part of the transmission signal sent to the output terminal 1103 is given to the feedback unit 112.

  As described above, according to the eleventh embodiment, the output signals of the plurality of transmission units are synthesized by the synthesizer into one transmission signal, and a part thereof is extracted and used as the feedback signal. Therefore, the analog signal selection switch in the case where there are a plurality of signal distributors is not necessary, so that the same effects as those of the first embodiment can be obtained while simplifying the configuration.

  In addition, although the application example to Embodiment 1 is shown in this Embodiment 11, it cannot be overemphasized that it is applicable similarly to Embodiment 2-8.

  INDUSTRIAL APPLICABILITY The present invention is suitable for realizing a small size, low power consumption, and low cost when incorporating a feedback distortion compensation function into a transmission apparatus having a plurality of transmission means and further incorporating a background calibration function. is there.

The block diagram which shows the structure of the transmitter which concerns on Embodiment 1 of this invention. The block diagram which shows the structure of the transmitter which concerns on Embodiment 2 of this invention. The block diagram which shows the structure of the transmitter which concerns on Embodiment 3 of this invention. The block diagram which shows the structure of the transmitter which concerns on Embodiment 4 of this invention. The block diagram which shows the structure of the transmitter which concerns on Embodiment 5 of this invention. The block diagram which shows the structure of the transmitter which concerns on Embodiment 6 of this invention. The block diagram which shows the structure of the transmitter which concerns on Embodiment 7 of this invention. The block diagram which shows the structure of the transmitter which concerns on Embodiment 8 of this invention. The block diagram which shows the structure of the communication apparatus which concerns on Embodiment 9 of this invention. Block diagram showing a configuration of a communication apparatus according to Embodiment 10 of the present invention. The block diagram which shows the structure of the transmitter which concerns on Embodiment 11 of this invention. A block diagram showing a configuration example of a transmission apparatus that implements a conventional feedback distortion compensation method FIG. 12 is a block diagram showing a configuration example of the distortion compensation unit shown in FIG. A block diagram showing a configuration example of a conventional transmission device having a background calibration function

Explanation of symbols

100, 200, 300, 400, 500, 600, 700, 800, 1100 Transmitter 101, 102 Transmitter 103, 104 Transmitted data generator 105, 105a, 105b, 106, 106a, 106b Digital / analog converter (D / A)
107, 108 Analog transmission circuit 109, 110, 1102 Signal distributor 111 Analog signal selection switch 112 Feedback unit 113 Analog reception circuit 114, 114a, 114b Analog to digital converter (A / D)
Reference Signs List 115 Signal processing unit 116 Distortion compensation calculation unit 117, 118 Amplitude / phase correction unit 119, 120, 602, 603, 702, 703, 802 Selection means 301, 303, 307 Quadrature modulator 302, 304, 306 Analog device 401, 501 502 Local oscillator 402, 406, 412 Gain limiter (ATT)
403, 407, 410 Frequency conversion means 404, 408 High frequency amplifier (AMP)
405, 409, 411 Filters 601, 701, 801 Amplitude / phase comparison unit 900, 1000 Communication device 901, 902 Receiving device 903 Multi-input receiving device 904, 905 Antenna duplexer 906, 907 Antenna 1101 Synthesizer

Claims (8)

A plurality of transmission means for performing a process of analog conversion, modulation, and amplification on input transmission data to generate a transmission signal;
Transmission data generation means for generating the same number of transmission data as the plurality of transmission means;
A plurality of signal distribution means for extracting a part of transmission signals generated and output by each of the plurality of transmission means;
Feedback signal generation means for performing a process of amplification, demodulation, and digital conversion on a partial transmission signal extracted by one signal distribution means selected from the plurality of signal distribution means, and generating a feedback signal;
Distortion compensation calculation means for calculating a distortion compensation coefficient based on a comparison result of amplitude and phase between the feedback signal and transmission data to be distortion compensated among a plurality of transmission data generated and output by the transmission data generation means;
A plurality of amplitudes which are subjected to distortion compensation processing based on the distortion compensation coefficient on transmission data to be compensated for distortion among transmission data generated and output by the transmission data generation means and input to the corresponding transmission means among the plurality of transmission means A transmission device comprising phase correction means.   A local signal oscillating means for commonly generating a local signal used in a frequency converting means for performing modulation processing in each of the plurality of transmitting means and a local signal used in a frequency converting means for performing demodulation processing in the feedback signal generating means; The transmission apparatus according to claim 1, wherein:   The plurality of transmission units each include a local signal oscillation unit that generates a local signal used in a frequency conversion unit that performs modulation processing, and a local signal oscillation unit included in one of the plurality of transmission units is generated. 2. The transmission apparatus according to claim 1, further comprising a local selection unit that selects a local signal as a local signal used by a frequency conversion unit that performs demodulation processing by the feedback signal generation unit.   Based on the feedback signal and transmission data to be corrected among the transmission data input to the plurality of transmission means, the amplitude and phase error generated in the corresponding transmission means are measured, and the measurement result is the corresponding amplitude. 4. The transmission apparatus according to claim 1, further comprising: an amplitude phase comparison unit that is supplied to the phase correction unit to perform correction processing.   Based on the feedback signal and transmission data generated and output by the transmission data generation means, the amplitude and phase errors generated in the corresponding transmission means are measured based on the transmission data to be corrected, and the measurement result is the corresponding amplitude. 4. The transmission apparatus according to claim 1, further comprising: an amplitude phase comparison unit that is supplied to the phase correction unit to perform an error correction process.   6. The transmission device according to claim 1, a plurality of reception devices, a transmission signal output terminal of a plurality of signal distribution means included in the transmission device, and a reception signal input terminal of the plurality of reception devices. A plurality of antenna sharing means for connecting the antenna to a corresponding antenna.   The communication apparatus according to claim 6, wherein the plurality of signal distribution means included in the transmission apparatus are relocated between the plurality of antenna sharing means and the corresponding antenna. A plurality of transmission means for performing a process of analog conversion, modulation, and amplification on input transmission data to generate a transmission signal;
Transmission data generation means for generating the same number of transmission data as the plurality of transmission means;
Combining means for combining the transmission signals generated and output by each of the plurality of transmitting means; signal distribution means for extracting a part of the transmission signals combined and output by the combining means;
Feedback signal generating means for generating a feedback signal by performing amplification, demodulation, and digital conversion processing on the partial transmission signal extracted by the signal distribution means;
Distortion compensation calculation means for calculating a distortion compensation coefficient based on a comparison result of amplitude and phase between the feedback signal and transmission data to be distortion compensated among a plurality of transmission data generated and output by the transmission data generation means;
A plurality of amplitudes which are subjected to distortion compensation processing based on the distortion compensation coefficient on transmission data to be compensated for distortion among transmission data generated and output by the transmission data generation means and input to the corresponding transmission means among the plurality of transmission means A transmission device comprising phase correction means.

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