JPH09153849A - Radio equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce adjacent channel leaking power and to realize satisfactory communication by converging a distortion compensation coefficient to an optimum value in a short time. SOLUTION: The output of a transmission power amplifier 30 is terminated with a pseudo load having the same input impedance with an antenna 31, and random transmission data is inputted to an operation/control part 24. The operation/control part 24 executes a pre-distortion processing on data, outputs it, compares transmission data with data obtained by detecting a carrier and updates the distortion compensation coefficient. The distortion compensation coefficient converged by means of the similar progressing is initialized in a non-volatile storage means 25. In an operation, the operation/control part 24 executes the pre-distortion processing on transmission data by using the distortion compensation coefficient stored in the storage means, operates the distortion compensation coefficient by using transmission data and data obtained by demodulating the carrier and updates it. When communication terminates, the content of the storage means 25 is rewritten by means of the latest distortion compensation coefficient and the pre-distortion processing is executed by using the distortion compensation coefficient store din the storage means 25 for next communication.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless device,
In particular, the present invention relates to a radio apparatus having a distortion compensation function that linearizes the amplification characteristic of a transmission power amplifier to suppress nonlinear distortion and reduces adjacent channel leakage power.

[0002]

2. Description of the Related Art In recent years, frequency resources have become tight, and high-efficiency transmission by digitization has been widely used in wireless communication. When applying the multi-level amplitude modulation method to wireless communication, it is important to have a technique that linearizes the amplification characteristics of the power amplifier on the transmission side to suppress nonlinear distortion and reduce adjacent channel leakage power. In order to improve the power efficiency by using, the technology to compensate the distortion caused by it is indispensable.

FIG. 36 is a block diagram of an example of a transmission device in a conventional radio device, which is a voice CODEC (Coder / Decode).
r) The digital data group sent from 1 is the TDMA unit 2
In, the burst processing and the separation processing into the I signal and the Q signal are performed, and the signals are output to the DA converter in the assigned time slot. The DA converter 3 converts it into an analog baseband signal and inputs it to the quadrature modulator 4. Quadrature modulator 4 the input I, this and each reference carrier wave in Q signal is multiplied by a 90 ⁰ phase-shifted signal, and outputs by performing an orthogonal transformation by adding the multiplication results. The frequency converter 5 mixes the quadrature modulated signal and the local oscillation signal to convert the frequency, and the transmission power amplifier 6 power-amplifies the carrier wave output from the frequency converter 5 and aerial (antenna) 7
It radiates more into the air.

In such a transmitter, the input / output characteristic of the transmission power amplifier becomes non-linear as shown by the dotted line in FIG. This non-linear characteristic causes nonlinear distortion, and the frequency spectrum around the transmission frequency f ₀ is shown in FIG. 37 (b).
Side lobes are lifted as shown by the dotted line in (1) and leak to adjacent channels, causing adjacent interference. Therefore, the LINC (Linear Amplifi
Various types of analog distortion compensation methods such as cation by combination of C-Class Amplification), feedforward method, analog Cartesian method, polar loop method, and predistortion method using non-linear elements have been proposed. However, these methods have drawbacks that if the feedback gain is increased to improve the distortion improving performance, band noise increases and phase adjustment is difficult.

Under these circumstances, signal processor (DSP: Digital S
Since the processing speed of the ignal processor) has been remarkably improved, a method of compensating for distortion by digital signal processing technology has become a reality. As a digital non-linear distortion compensation method, Adaptive Linearization using pre-distortion (M
ichael Fsulkner & Mats Johanson; "Adaptive Lineari
sation using pre-distortion-Experimental Results ",
IEEE TRANSACTION ON VEHICULAR TECHNOLOGY, VOL.NO
2. MAY 1994) and many other papers have been published, and the theory is well known. If this digital system is put to practical use, the drawbacks of the analog system will be solved.

FIG. 38 is a block diagram of a transmitter having a digital non-linear distortion compensation function using a DSP. Voice C
The digital data group sent from ODEC1 is TDM.
Burst processing is performed in the A unit 2, and in the allocated time slot, for example, arithmetic / composition composed of DSP
It is input to the control unit 8. The arithmetic / control unit 8 is functionally shown in FIG.
As shown in FIG. 9, the distortion compensation coefficient storage unit 8a that stores the distortion compensation coefficient h (pi) (i = 0 to 1023) corresponding to the input level 0 to 1023 of the modulated signal, the distortion compensation coefficient h corresponding to the transmission data. A predistortion unit 8b that applies distortion compensation processing (predistortion) to the transmission data using (pi), compares the transmission modulation signal with a demodulation signal demodulated by a quadrature detector described later, and the difference becomes zero. Calculate the distortion compensation coefficient h (pi) as
The distortion compensation coefficient calculator 8c for updating is provided.

The operation / control unit 8 performs predistortion processing on the input signal using the distortion compensation coefficient h (pi) corresponding to the level of the input signal, converts it into an I signal and a Q signal, and outputs it to the DA converter 3. input. The DA converter 3 converts the input I signal and Q signal into analog baseband signals and inputs them to the quadrature modulator 4. The quadrature modulator 4 receives the input I signal,
Each Q signal reference carrier and which multiplies 90 ⁰ phase-shifted signal, and outputs by performing an orthogonal transformation by adding the multiplication results. The frequency converter 5 mixes the quadrature modulation signal and the local oscillation signal to convert the frequency, and the transmission power amplifier 6 power-amplifies the carrier signal output from the frequency converter 5 and radiates it from the antenna 7 to the air. . A part of the transmission signal is transmitted through the directional coupler 9 to the frequency converter 1
0 is input, frequency conversion is performed here, and quadrature detector 11
Is input to Quadrature detector 11 performs quadrature detection by multiplying the respective reference carrier to the input signal which 90 ⁰ phase-shifted signal and inputs I baseband to reproduce the Q signal to the AD converter 12 in the transmitting side . The AD converter 12 converts the input I and Q signals into digital signals and inputs them to the arithmetic / control section 8. The arithmetic / control unit 8 compares the transmitted modulated signal with the demodulated signal demodulated by the quadrature detector, and calculates and updates the distortion compensation coefficient h (pi) so that the difference becomes zero. Next, pre-distortion processing is performed using the updated distortion compensation coefficient for the next modulated signal to be transmitted, and the signal is output. After that, by repeating the above operation, the nonlinear distortion of the transmission power amplifier is suppressed and the adjacent channel leakage power is reduced.

[0008]

As described above, the digital non-linear distortion compensation system performs feedback detection of a transmission signal, digitally converts the amplitudes of the transmission signal and the feedback signal and compares them, and the distortion compensation is performed based on the comparison result. The principle is to update the coefficient in real time. Therefore, digital processing DSP
There is a drawback that the processing speed cannot keep up with the increase in the data transmission speed due to the limitation of the operation speed. That is, the DSP can perform the real-time calculation at a transmission rate of about 8 Kbps, but cannot perform the calculation at a high-speed transmission of 32 Kbps. Such a drawback is fatal for high-speed transmission in which the band increases as the transmission speed increases and the necessity of distortion compensation increases, in other words, the conventional method of FIG. 38 cannot be applied to high-speed transmission.

As a method for solving such a problem, TDMA
In the wireless device of the system, the data of the modulated signal transmitted in the time slot assigned to itself is stored,
It is conceivable to perform distortion compensation calculation over the idle slot period. However, in this method, since the distortion compensation coefficient is updated for each burst, the distortion compensation coefficient at each level is updated at most once in one TDMA frame period. For this reason, it takes time until the distortion compensation coefficient converges, and during that time, distortion compensation is not normally performed, the band is widened, adjacent interference is caused, and good data communication cannot be performed. In the case of the real-time processing of FIG. 38, when the same level of data is input n times in one time slot, the distortion compensation coefficient is updated n times, and the distortion compensation coefficient converges in a short time.

By the way, in a distortion compensating system in which a baseband signal is separated into a phase and an amplitude and their magnitudes are compared, if there is an amplitude error due to an offset between the quadrature modulator and the quadrature detector, an error occurs in the calculation. Proper distortion compensation will not be performed. FIG. 40 shows a modulated wave QPSK-modulated on a complex plane, where the direction is the phase and the length is the amplitude. When the amplitude is originally a as shown in the figure, if an offset exists, the offset is superimposed and the control / calculation unit erroneously recognizes the amplitude as b. Since the digital non-linear distortion compensation method compares the amplitude components, the erroneous recognition of the amplitude leads to a distortion compensation error, and proper distortion compensation cannot be performed. That is, while the offset is not compensated, the distortion coefficient updating process is meaningless and rather adversely affected.

From the above, a first object of the present invention is to provide a radio apparatus having a distortion compensation function applicable to high speed data transmission. A second object of the present invention is to calculate a distortion compensation coefficient in advance and store it in a memory, and perform predistortion processing and distortion compensation coefficient update processing using the distortion compensation coefficient to converge the distortion compensation coefficient convergence time. It is an object of the present invention to provide a wireless device that shortens the bandwidth, suppresses the spread of the band, and can perform good data transmission. A third object of the present invention is to store the latest distortion compensation coefficient and perform predistortion processing and distortion compensation coefficient update processing from the distortion compensation coefficient in the next communication to reduce the convergence time of the distortion compensation coefficient. It is to provide a device. A fourth object of the present invention is to provide a wireless device which inputs low-speed data to a calculation / control unit during a preamble period and performs a distortion compensation coefficient updating process in real time to shorten the convergence time of the distortion compensation coefficient. .

A fifth object of the present invention is channel frequency /
A plurality of distortion compensation coefficients are stored in a memory for each of transmission power, ambient temperature, power supply voltage, and antenna characteristics,
It is an object of the present invention to provide a wireless device which shortens the convergence time of the distortion compensation coefficient by using the distortion compensation coefficient according to the state of use. A sixth object of the present invention is to use a distortion compensation coefficient stored in the memory by operating the distortion compensation coefficient after the feedback means such as the quadrature detector is removed from the wireless device after the distortion compensation coefficient is calculated and stored in the memory. It is an object of the present invention to provide a wireless device that can be reduced in price, weight, and size by performing accurate predistortion processing. A seventh object of the present invention is to provide a radio apparatus that compensates the offset of the modulator and the detector and then executes the distortion compensation coefficient updating process. An eighth object of the present invention is to provide a wireless device capable of shortening the offset compensation time of the modulator and the detector and accelerating the start time of the distortion compensation coefficient updating process.

[0013]

FIG. 1 is a diagram illustrating the principle of the present invention. Reference numeral 21 is a CODEC that converts an analog signal into digital data, 22 is a TDMA unit that bursts input data at a predetermined timing before an assigned time slot, and outputs data, and 23 is an input that stores the burst data. The buffer memory 24 is an arithmetic / control unit (distortion compensating unit) composed of, for example, a DSP,
Predistortion processing is applied to the input data using the distortion compensation coefficient h (pi) corresponding to the level of the input data, and I
The signal and the Q signal are converted and output, and the input data and the demodulated data demodulated by the quadrature detector are compared, and the distortion compensation coefficient h (pi) is updated by calculating so that the difference becomes zero. .. Reference numeral 25 is a non-volatile storage means for storing distortion compensation coefficients for compensating for distortion characteristics of the transmission power amplifier or the like, or a storage means backed up by a battery, and 26 is a predistorted I signal and Q signal. An output buffer memory, 27 is a DA converter that converts the I signal and Q signal stored in the output buffer into an analog baseband signal, and 28 is a quadrature modulator, which is a reference carrier for the input I signal and Q signal. and this was multiplied by 90 ⁰ phase-shifted signal, and outputs by performing an orthogonal transformation by adding the multiplication results. Reference numeral 29 is a frequency converter that mixes an output signal of a quadrature modulator and a local oscillation signal to up-convert, and 30 is power amplification of a carrier signal output from the frequency converter and radiates it into the air from an antenna (antenna) 31. A power amplifier, 32 is a directional coupler for extracting a part of a transmission signal, 33 is a frequency converter for down-converting a carrier wave and a local oscillation signal by mixing, and 34 is a quadrature detector, which is a reference carrier wave for each input signal. And quadrature detection by multiplying this by 90 ⁰ phase-shifted signal to reproduce and output the baseband I and Q signals on the transmission side, and 35 denotes the I and Q signals input from the quadrature detector. An AD converter 37 for converting into digital is a feedback buffer memory for storing demodulated data (feedback data) subjected to quadrature detection.

The antenna 31 is removed in advance, the output of the transmission power amplifier 30 is terminated by a pseudo load having the same input impedance as the antenna, and random transmission data is input to the arithmetic / control unit 24. The arithmetic / control unit 24 performs predistortion processing on the data and outputs the data.
The distortion compensation coefficient is calculated and updated by comparing with the data obtained by feedback detection of the carrier wave. After that, the predistortion processing and the distortion compensation coefficient updating processing are repeated to store the converged distortion compensation coefficient in the storage means 25. In actual operation, the arithmetic / control unit 24 performs predistortion processing on the digital data to be transmitted using the distortion compensation coefficient stored in the storage unit 25, and demodulates the transmitted modulated signal and carrier wave to obtain it. The distortion compensation coefficient is calculated and updated using the obtained demodulated signal, the content of the storage means 25 is rewritten with the latest distortion compensation coefficient at the end of communication, and the distortion compensation coefficient stored in the storage means at the next communication. To perform pre-distortion processing.

As described above, the distortion compensation coefficient for suppressing the nonlinear distortion of the transmission power amplifier and preventing the adjacent channel leakage is obtained in advance and stored in the storage means, and the distortion compensation coefficient is started from the distortion compensation coefficient during operation. Since the coefficient is updated, the distortion compensation coefficient converges to a constant value in a short time, correct predistortion processing can be performed according to the operating state, and the spread of the band can be suppressed and the adjacent channel leakage power can be reduced. it can. Further, since the latest distortion compensation coefficient is stored in the storage means at the end of communication and used in the next communication, the distortion compensation coefficient can be converged to a constant value in a short time during operation. ... claims 1 to 3

Prior to the assigned time slot, the arithmetic / control unit 24 performs predistortion processing on the input data and stores it in the output buffer memory 26, and the quadrature modulator 2 in the assigned time slot.
7 performs quadrature modulation based on the data stored in the output buffer, and the power amplifier 30 amplifies the carrier wave and the antenna 3
1, the quadrature detector 34 detects the carrier wave and stores it in the feedback buffer memory 37.
Reference numeral 4 carries out arithmetic update processing of the distortion compensation coefficient using the transmission data and the demodulation data, straddling the allocated time slot and idle time slot. By doing so, it is possible to reliably perform the distortion compensation coefficient update processing in one TDMA frame period, and perform the predistortion processing using the updated distortion compensation coefficient in the next self-assigned time slot. ... Claim 4

When the own time slot in the next TDMA frame period is approaching, the arithmetic / control section 24 terminates the distortion compensation coefficient updating process. By doing so, even when the transmission speed becomes high and the distortion compensation coefficient cannot be updated for all input data in the idle time slot, the arithmetic / control unit 24 alternately performs the predistortion processing and the distortion compensation coefficient updating processing. You can continue without confusion. ... Claim 6 Further, when the calculation / control unit 24 updates the distortion compensation coefficient,
The distortion compensation coefficient updating process is executed for each level of the transmission data, and for the transmission data of the level already updated in the TDMA frame period, the calculation and updating of the distortion compensation coefficient are omitted in the TDMA period. By doing so, the number of times the distortion compensation coefficient is calculated and updated can be reduced, and the distortion compensation coefficient can be sufficiently updated even if the transmission speed becomes high and the idle time slot period becomes short. It can cope with high-speed transmission.・
..Claim 5

The TDMA unit 32 inputs low speed data as a modulation signal to the arithmetic / control unit 24 in the preamble period preceding the own time slot, and the arithmetic / control unit 24 uses the low speed data input in the preamble period. The distortion compensation coefficient is calculated and updated in real time, and high-speed data input during the burst period is stored, and the distortion compensation coefficient is calculated and updated over its own time slot and idle slot. As described above, since the distortion compensation coefficient is updated in real time using the low-speed data, 1 TDMA is performed.
The distortion compensation coefficient calculation can be converged in a short time by increasing the number of times of updating the distortion compensation coefficient between frames.・
..Claim 7

The reflected wave detecting means detects the reflected wave reflected by the antenna of the wireless device, and the arithmetic / control section 24 updates the distortion compensation coefficient when the reflected wave level in the data transmission burst period is equal to or more than the set value. Absent. When the reflected wave level is equal to or higher than the set value, it means that the characteristics of the antenna change and the input impedance changes considerably.
The distortion compensation coefficient is effective when the input impedance of the antenna is a predetermined value (for example, 50Ω). Therefore, the demodulated data when the reflected wave level is equal to or higher than the set value cannot be trusted, and the distortion compensation coefficient updating process is not performed. This can prevent the distortion compensation coefficient from becoming inaccurate. ······························································· A plurality of distortion compensation coefficients for each of the channel frequency / transmission power, ambient temperature, power supply voltage, and antenna characteristics, and the arithmetic / control unit 24 Distortion compensation and distortion compensation coefficient update processing are performed using the distortion compensation coefficient according to the state of use (channel frequency / transmission power, ambient temperature, power supply voltage, voltage standing wave ratio).
By doing so, the convergence time of the distortion compensation coefficient can be shortened. ... Claim 10 to Claim 13

The TDMA unit 23 operates the low speed data during the preamble period and the communication data during the burst period, and operates / controls the control unit 2.
4, the arithmetic / control unit 24 compares the low speed data and the demodulated data in real time and determines the suitability of the distortion compensation coefficient based on the difference, and the difference is large and the distortion compensation coefficient is an appropriate value. If not, an alarm is output or communication data transmission is prohibited and only low-speed data at the preamble is set. By doing so, communication data can be stopped when the distortion compensation coefficient is no longer an appropriate value due to characteristic variations of the transmission unit such as the transmission power amplifier, and data communication can be restarted when the distortion compensation coefficient returns to an appropriate value again. Alternatively, the alarm allows the user to take immediate action. ·········································································· Destroyed data obtained by demodulating a partial data of the transmitted data and a carrier modulated by the data And are used to calculate and update the distortion compensation coefficient in real time. For example, the distortion compensation coefficient is calculated and updated in real time for every n pieces (n symbols) of input data. By doing this, if the number of data in one time slot is N symbols, the distortion compensation coefficient update processing can be performed N / n times in real time, and real-time processing can be performed by the DSP even during high-speed data transmission, and no buffer memory or the like is required. Therefore, a device with reduced cost can be realized. ... Claim 15

The parts 32 to 37 for demodulating the quadrature-modulated carrier wave and inputting the demodulated data to the arithmetic / control part 24 are prepared as auxiliary devices so that the parts can be detachably connected to the radio device. With this configuration, the auxiliary device and the pseudo load are connected to the wireless device before the operation, the distortion compensation coefficients are converged and stored in the storage means 25, and then the auxiliary device is removed and the actual operation is performed. When the distortion compensation coefficient is stored in the storage means 25, the data speed is set to a low speed and the calculation / control unit 24
Then, the distortion compensation coefficient is updated in real time using the low speed data and the demodulated data, the distortion compensation coefficient is converged, and the converged distortion compensation coefficient is stored in the storage means 25. According to the above, when using, accurate predistortion processing can be performed by using the distortion compensation coefficient stored in the storage unit 25, the spread of the band can be prevented, the adjacent channel leakage can be prevented, and the price is low. Weight reduction and size reduction are possible.
... Claim 16 and Claim 17

The TDMA unit 22 operates the low speed data during the preamble period and the communication data during the burst period.
4, the arithmetic / control section 24 performs predistortion processing on the communication data using the distortion compensation coefficient stored in the storage means 25, and demodulates the low speed data and the carrier wave modulated by the low speed data. The distortion compensation coefficient is updated in real time using the demodulated data thus obtained. in this way,
Since the distortion compensation coefficient is updated in real time using the low-speed data, it is possible to shorten the convergence time of the distortion compensation coefficient. ... 18. When transmitting data in a plurality of time slots as in a base station device of a mobile radio system, the data transmitted in a predetermined time slot (for example, the first time slot) and demodulated data are stored, The calculation / control unit 24 calculates and updates the distortion compensation coefficient using the transmission data and the demodulation data over the predetermined time slot and other time slots. With this configuration, the wireless device that transmits data in a plurality of time slots can also perform the predistortion processing and the distortion compensation coefficient updating processing by using the distortion compensation coefficient stored in the storage unit 25, and the distortion compensation coefficient can be set in a short time. Can be converged with. ... Claim 19

Like a base station device of a mobile radio system,
When sending data in multiple time slots,
The low speed data is inserted into a predetermined empty time slot, and the arithmetic / control unit 24 updates the distortion compensation coefficient in real time using the low speed data and the data obtained by demodulating the carrier wave modulated by the low speed data. With this configuration, the wireless device that transmits data in a plurality of time slots can also perform the predistortion process and the distortion compensation coefficient updating process using the distortion compensation coefficient stored in the storage unit 25, and can perform the distortion compensation in real time. The coefficient update process can be performed, and the distortion compensation coefficient can be converged in a short time. ... Claim 20

Burst period for transmitting data by providing offset measuring means for measuring the offset value of the quadrature modulator 28, offset compensating means for performing offset compensation processing on transmission data based on the offset value, and detecting convergence of offset compensation. In the preamble period placed before, the offset measuring unit measures the offset value, and the offset compensating unit performs the offset compensation process based on the offset value obtained by the measurement, and the offset value measurement and the offset compensation process are performed. Is repeated until the offset compensation converges, and when the offset compensation converges in the preamble period, the arithmetic / control unit 24
Performs predistortion processing on transmission data using the distortion compensation coefficient stored in the storage means 25 from the next own time slot, calculates and updates the distortion compensation coefficient, and stores the updated distortion compensation coefficient at the end of communication. It is stored in the means 25. On the other hand, when the offset processing does not converge in the preamble period, the arithmetic / control unit 24 performs predistortion processing using the distortion compensation coefficient stored in the storage means and inputs it to the quadrature modulator 28. Will not be updated. With the above configuration, the predistortion processing and the distortion compensation coefficient updating processing are performed after the influence of the offset is eliminated, so that accurate distortion compensation and distortion compensation coefficient updating processing can be performed.

Further, a non-volatile storage means for storing an offset compensation coefficient for compensating the offset of the modulator or a storage means backed up by a battery is provided, and the latest offset compensation coefficient is stored in the storage means at the end of the communication, and at the time of communication. The offset compensating means starts the offset compensating process in the preamble period with the offset compensating coefficient stored in the storing means as an initial value. With this configuration, the offset process can be converged in a short time, and the start time of the predistortion process and the distortion compensation coefficient update process can be advanced. Similar processing is performed for the offset of the quadrature detector. ...
Claim 22 to Claim 28

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION

(A) First Embodiment (a) Overall Configuration FIG. 2 is a configuration diagram of a wireless device of the first embodiment. 2 in the figure
1 is a CO for converting a voice analog signal into digital data
DEC, 22 is a TDMA that outputs burst data at a predetermined timing before the assigned time slot.
Reference numeral 23 is an input buffer memory (RAM) for storing the burst data, and 24 is an arithmetic / control unit (distortion compensating unit) composed of a DSP or the like, which converts input data into an I signal and a Q signal. Predistortion processing is applied to the input data using the distortion compensation coefficient h (pi) according to the level, and the digital data is compared with the demodulated data demodulated by the quadrature detector, and the difference becomes zero. Thus, the distortion compensation coefficient h (pi) is calculated and updated.

Reference numeral 25a is a nonvolatile memory such as an E ² PROM for storing distortion compensation coefficients for compensating for distortion characteristics of the transmission power amplifier in advance, 25b is a battery backed up RAM, and 25c is an RO for storing various parameters.
M and 26 are output buffer memories (RAM) for storing the I and Q signals which have been subjected to the predistortion process, 2
Reference numeral 7 is a DA converter for converting the I signal and the Q signal stored in the output buffer into an analog baseband signal, and 28 is a quadrature modulator. The input I signal and the Q signal each have a reference carrier and this reference carrier. ⁰ A signal that performs a quadrature conversion by multiplying the phase-shifted signals and adding the multiplication results, and outputs, 29 is a frequency converter that mixes the quadrature modulated signal and the local oscillation signal to up-convert, and 30 is a frequency converter Power amplifier that amplifies the power of the carrier wave output from the device and radiates it in the air from the antenna (antenna) 31,
Reference numeral 32 is a directional coupler for extracting a part of the transmission signal, 33 is a frequency converter for down-converting by mixing the carrier wave and the local oscillation signal, 34 is a quadrature detector, and the reference carrier wave and the reference carrier wave are respectively input signals. 90 ⁰ Quadrature detection is performed by multiplying the phase-shifted signal to reproduce and output baseband I and Q signals on the transmission side. Reference numeral 35 converts the I and Q signals input from the quadrature detector to digital. An AD converter 37 is a feedback buffer memory for storing the demodulated data (feedback data) subjected to the quadrature detection.

38 is a microcomputer, 39 is an operating section, 40 is a random data generating section for generating random data in the maintenance mode, 41 is a pseudo load having the same input impedance (= 50 Ω) as the antenna, and 42 is an antenna or pseudo. A connection terminal to which a load is appropriately connected, and 43 is a PLL circuit that generates a reference carrier wave.

(B) Configuration of Quadrature Modulator and Quadrature Detector FIG. 3 is a configuration diagram of the quadrature modulator and the quadrature detector. 28 is a quadrature modulator, 34 is a quadrature detector, and 43 is a reference carrier. The PLL circuit 44 is a hybrid circuit that branches the reference carrier into a quadrature modulator and a quadrature detector. In the quadrature modulator 28, 28a is a phase shifter for shifting the reference carrier by 90 ⁰ , 28b is a multiplier for multiplying the I signal by the reference carrier, and 28c is a multiplier for multiplying the Q signal by the 90 ⁰ shifted reference carrier. It is a vessel. The signals multiplied by the multipliers are combined and output. In the quadrature detector 34, 34a
Is a phase shifter that shifts the reference carrier by 90 ⁰ , 34b is a multiplier that multiplies the input signal by the reference carrier and outputs the I signal, 3
4c is a multiplier for outputting a Q signal by multiplying the reference carrier wave 90 ⁰ phase shift in the input signal.

(C) Control of arithmetic / control unit FIG. 4 is a functional block configuration diagram of the arithmetic / control unit 24, in which 24 is an arithmetic / control unit, 25a is a non-volatile memory such as an E ² PROM, and 25b is a battery. Backup RAM
It is. The calculation / control unit 24 uses a distortion compensation coefficient storage unit 24a that stores distortion compensation coefficients, and a predistortion unit that performs predistortion processing on the transmission data using the distortion compensation coefficient h (pi) according to the transmission data level. 24b, the transmission data and the demodulation data demodulated by the quadrature detector 34 are compared, the distortion compensation coefficient h (pi) is updated so that the difference becomes zero, and the distortion compensation coefficient is stored in the distortion compensation coefficient storage unit 24a. An arithmetic unit 24c and a distortion compensation coefficient reading / writing unit 24d are provided. The non-volatile memory 25a stores in advance the distortion compensation coefficient hi (pi) (i = 0 to 10) according to the input level 0 to 1023 of the transmission data.
23) is stored.

At the time of the first communication, the distortion compensation coefficient reading / writing unit 24d sets the distortion compensation coefficient stored in the non-volatile memory 25a in the distortion compensation coefficient storage unit 24a, and then the predistortion unit 24b transmits the transmission data. The distortion compensation coefficient h (pi) corresponding to the level of
Then, the transmission data is subjected to pre-distortion processing according to the distortion compensation coefficient, the transmission data is multiplied by the distortion compensation coefficient, and the multiplication result is output. The distortion compensation coefficient calculation unit 24c compares the transmission data with the demodulated data demodulated by the quadrature detector 34, updates the distortion compensation coefficient h (pi) so that the difference becomes zero, and stores it in the distortion compensation coefficient storage unit 24a. Rewrite memory contents. Although the method of calculating the distortion compensation coefficient is well known and its detailed description is omitted, for example, there is a method of calculating the distortion compensation coefficient using a comparison adaptive algorithm. Thereafter, the predistortion unit 24b performs predistortion processing using the updated distortion compensation coefficient,
The distortion compensation coefficient calculation unit 24c performs a distortion compensation coefficient update process. Then, when the communication is completed, the distortion compensation coefficient reading / writing unit 24d stores the contents of the distortion compensation coefficient storage unit 24a in the nonvolatile main memory 25a and the battery backup RAM 25.
Either or both of them are stored.

Thereafter, in the next communication, the read / write unit 24d reads the distortion compensation coefficient from the battery backup RAM 25b and sets it in the distortion compensation coefficient storage unit 24a. When the wireless device is not used for a long time and the stored content of the battery backup RAM 25b is lost, the distortion compensation coefficient is read from the non-volatile memory 25a and set in the distortion compensation coefficient storage unit 24a. Then, when the communication is completed, the read / write unit 24d stores the storage content of the distortion compensation coefficient storage unit 24a in either or both of the non-volatile positive memory 25a and the battery backup RAM 25.

(D) Processing Timing FIG. 5 is a time chart showing the processing timing of the first embodiment of the present invention. One frame of TDMA is composed of four time slots (channels) CH1 to CH4. One time slot is assigned to the wireless device. The TDMA unit 22 outputs the transmission burst data and writes it in the input buffer 23, and the arithmetic / control unit 24
Receives sequentially the transmission data from the input buffer and converts it into I and Q signals before the allocated first time slot. Predistortion processing is performed using the distortion compensation coefficient according to the level of the transmission data, and the result is written in the output buffer 26.

The DA converter 27 reads the I and Q signals from the output buffer 26 in the assigned first time slot, DA-converts them, and inputs them to the quadrature modulator 28. The quadrature modulator 28 is inputted I signal, this with each reference carrier wave in Q signal is multiplied by a 90 ⁰ phase-shifted signal, and outputs by performing an orthogonal transformation by adding the multiplication results. The transmission power amplifier 30 power-amplifies the carrier frequency-converted by the frequency converter 29 and radiates it to the air through the antenna 31. A part of the carrier wave is branched by the directional coupler 32, frequency-converted by the frequency converter 33, and then input to the quadrature detector 34. Quadrature detector 34 multiplies the reference carrier and which 90 ⁰ phase-shifted signal to the input signal I,
The Q signal is demodulated, and the AD converter 35 converts the I and Q signals into DA signals.
It is converted and stored in the feedback buffer 37. The above processing is performed on all the transmission burst data, and the feedback buffer 37 stores the demodulated data of all the transmission data.

The arithmetic / control unit 24 receives the transmission data stored in the input buffer 23 and the demodulation data stored in the feedback buffer 37 in the first time slot and the idle time slot (second to fourth channels). Each sample is read and compared, distortion compensation coefficient calculation processing is performed so that the difference becomes zero, and the distortion compensation coefficient up to that time is updated by the calculated distortion compensation coefficient (training of the distortion compensation coefficient). Such distortion compensation coefficient update processing is executed for all transmission data and demodulation data. After that, by repeating the above operation, the distortion compensation coefficient converges to a constant value.

Further, the microcomputer 38 uses the arithmetic / control section 24.
Timing T at which the transmission burst data is fetched from the input buffer 23 and the predistortion process is started.
_{The PST} is monitored, and at that time, the arithmetic / control unit 2
4 is instructed to stop the distortion compensation coefficient update process (predistortion) and start the next operation. As a result, the arithmetic / control unit 24 finishes the distortion compensation coefficient update processing and starts the predistortion processing for the next transmission burst data.

(E) Operation (e-1) Initial Setting of Distortion Compensation Coefficient for Non-Volatile Memory The antenna 31 (FIG. 2) was previously removed during the factory test, and the pseudo load 41 having the same input impedance as the antenna was used.
Is connected to the terminal 42, and the output of the transmission power amplifier 30 is terminated by the pseudo load 41. In this state, the operation unit 39
Select the maintenance mode in. In the maintenance mode, the microcomputer 38 activates the random data generator 40. As a result, the random data generator 4
0 generates random data and inputs it to the TDMA unit 22, and the TDMA unit 22 performs burst processing to input buffer 2
Write to 3. The arithmetic / control unit 24 reads the data from the input buffer 23, performs predistortion processing on the data using the distortion compensation coefficient h (pi) according to the data level, and outputs the data, as well as feedback detection of the transmission data and the modulation signal. The distortion compensation coefficient h (pi) is updated by comparing the obtained data with the self-slot and idle time. After that, the calculation / control unit 24 repeats the above operation until the distortion compensation coefficient h (pi) converges to a constant value.
The distortion compensation coefficient h (pi) is written in the E ² PROM 25a and / or the battery backup RAM 25b.

By performing the above-described operation of setting the distortion compensation coefficient on each wireless device, the distortion compensation coefficient corresponding to the distortion characteristic of each wireless device can be obtained and initialized in the nonvolatile memory or the battery backup RAM. . The random data generation unit 40 may be removed and the CODEC 21 may be configured to input random data from the outside.

(E-2) Operation during operation FIG. 6 is a processing flow during operation of the arithmetic / control unit 14.
When the communication start is instructed by the microcomputer 38, the arithmetic / control unit 24 reads the distortion compensation coefficient from the E ² PROM 25a or the battery backup RAM 25b and writes it in the internal distortion compensation coefficient storage unit 24a (FIG. 4) (step 101). The microcomputer 38 monitors the timing T _PST for starting the predistortion processing (step 1
02) At the time, the arithmetic / control unit 24 is instructed to take in the transmission data from the input buffer 23. As a result, the arithmetic / control unit 24 reads the transmission data for each sample from the input buffer (step 103), determines the level of the transmission data, and obtains the distortion compensation coefficient corresponding to the level from the distortion compensation coefficient storage unit 24a. (Step 10
4). Then, the arithmetic / control unit 24 converts the signals into I and Q signals, performs predistortion processing on the transmission data using the distortion compensation coefficient, and writes the transmission data in the output buffer 26 (steps 105 and 106). After that, the data written in the output buffer is orthogonally modulated and transmitted in the assigned time slot. Further, the transmission signal is subjected to quadrature detection and stored in the feedback buffer 37.

In parallel with the transmission of burst data in the assigned time slot, the arithmetic / control unit 24
In the self time slot and the idle time slot, the transmission data stored in the input buffer 23 and the demodulation data stored in the feedback buffer 37 are read out sample by sample and compared, and the difference becomes zero. The compensation coefficient calculation process is performed, and the distortion compensation coefficient up to that point is updated according to the calculation result. Such distortion compensation coefficient update processing is executed for the samples in the self time slot and the idle time slot (step 107).

Next, the arithmetic / control section 24 checks whether the communication has been completed (step 108), and if not completed, the processing from step 102 onward is repeated. When the communication is completed, the arithmetic / control unit 24 stores the storage content of the distortion compensation coefficient storage unit 24a in each of the nonvolatile positive memory 25a and the battery backup RAM 25b (step 10).
9). After that, at the next communication, the distortion compensation coefficient is read from the battery backup RAM 25b, set in the distortion compensation coefficient storage unit 24a, and the above operation is executed. As described above, the pseudo load is connected in advance at the factory test to calculate the distortion compensation, and the distortion compensation coefficient h (pi) which is the result is stored in the non-volatile memory. Since the distortion compensation training is started, the first transmission can be started with the distortion correction coefficient corresponding to the transmission characteristic of each device, and it is possible to prevent the emission of radio waves having a wide band, and , It is possible to shorten the time until it converges to the optimum distortion compensation coefficient.

(F) Modification (f-1) First Modification In the above description, the wireless device can transmit burst data in one assigned time slot. Moreover, the present invention can be applied to the case of transmitting data in a plurality of time slots. That is, as shown in FIG. 7, in a predetermined time slot (for example, the first time slot CH1), the transmission data is predistorted and transmitted, and the transmitted data and demodulated data are stored,
In the first time slot and the other time slots, the transmission data is pre-distorted and output, and the distortion compensation coefficient is calculated and updated using the transmission data and the demodulated data of the first time slot. .

FIG. 8 is a processing flow of the arithmetic / control unit 24 in such a case. When the communication start is instructed, the arithmetic / control unit 24 reads the distortion compensation coefficient from the E ² PROM 25a or the battery backup RAM 25b and writes it in the internal distortion compensation coefficient storage unit 24a (step 15).
1). Then, the arithmetic / control unit 24 sets the sending data to I and Q.
The signal is converted into a signal, the level of the transmission data is determined before each time slot (channel), the distortion compensation coefficient corresponding to the level is obtained from the distortion compensation coefficient storage unit 24a, and the distortion compensation coefficient is transmitted. Pre-distortion processing is applied to the data and output. (Step 152). The arithmetic / control unit 24 determines whether the time slot is the first time slot (first channel) (step 153), and if the time slot is the first time slot, collects the transmission data and the demodulation data in the memory (step 154). ). If it is not the first time slot, the transmission data and the demodulated data stored before the pre-distortion processing of the data to be transmitted to the slot before the slot and the transmission to the output buffer memory by using the distortion compensation coefficient are used. The distortion compensation coefficient is calculated and updated (step 155). The arithmetic / control unit 24 checks whether the communication is completed (step 156), and if not completed, repeats the processing after step 152. When the communication is completed, the arithmetic / control unit 24 stores the storage content of the distortion compensation coefficient storage unit 24a in the nonvolatile memory 25.
a and the battery backup RAM 25 (step 157). After that, at the next communication, the distortion compensation coefficient is read from the battery backup RAM 25b, set in the distortion compensation coefficient storage unit 24a, and the above operation is executed.

As described above, even a wireless device that transmits data in a plurality of time slots can start the first transmission by using the distortion compensation coefficient corresponding to the transmission characteristics of the device, and the band is widened. It is possible to prevent radio waves from being emitted, and it is possible to shorten the time required to converge to the optimum distortion compensation coefficient.

(F-2) Second Modification In the above, the calculation / control unit 24 calculates the distortion compensation coefficient for all the transmission data in the distortion compensation coefficient update processing, and the old distortion compensation is performed using the obtained distortion compensation coefficient. This is the case when the coefficient is updated. However, since the same distortion compensation coefficient is calculated for transmission data having the same level, useless updating processing is performed. Therefore, when updating the distortion compensation coefficient, the arithmetic / control unit 24 executes the distortion compensation coefficient update processing for each level of the transmission data, and regarding the transmission data of the level already updated in the TDMA frame period,
The distortion compensation coefficient calculation is omitted in the TDMA period. By doing so, the number of times the distortion compensation coefficient is calculated and updated can be reduced, and the distortion compensation coefficient can be sufficiently updated even when the transmission speed becomes high or the idle time slot period becomes short. Therefore, high-speed transmission can be supported.

FIG. 9 shows the distortion compensation coefficient storage unit 24 in such a case.
It is a memory content explanatory view of a, and the flag which shows whether the distortion compensation coefficient was updated is newly provided. FIG. 10 is a flowchart of the distortion compensation coefficient update processing when the distortion compensation coefficient update processing is omitted when the levels are the same. At the initial stage, all flags in the distortion compensation coefficient storage unit 24a are "0".
Has been cleared. The arithmetic / control unit 24 checks whether or not it is the timing for updating the distortion compensation coefficient (self slot and idle time slot) (step 107).
a), at the update processing timing, the input buffer 23
And the i-th transmission data and the demodulation data are read from the feedback buffer 37 (the initial value of i is 1) (step 1
07b). Then, the level of the i-th transmission data is judged, and it is checked whether the flag corresponding to the level is "1", in other words, whether the distortion compensation coefficient of this level has been updated (step 107c). ). When the flag is "0", the distortion compensation coefficient h is calculated using the transmission data and the demodulation data.
(pi) is calculated, and the distortion compensation coefficient h (pi) is used to update the old distortion compensation coefficient (step 107d). Then
A flag corresponding to the level is set to "1" (step 107e), and it is checked whether processing has been completed for all transmission data (step 107f). If the processing has not been completed for all the transmission data, i is incremented (step 107g) and the processing from step 107b is repeated.

On the other hand, if the flag is "1" in step 107c, the distortion compensation coefficient has already been updated, and therefore the distortion compensation coefficient is not calculated and updated.
The judgment of step 107f is made. When the processing is completed for all the transmission data of one time slot, all the flags in the distortion compensation coefficient storage unit 24a are cleared to "0" (step 107h), and the next processing time for updating the distortion compensation coefficient is waited.

(B) Second Embodiment In the first embodiment, the transmission data is pre-distorted in the assigned time slot and transmitted, and the transmission data and the demodulation data are stored, and the own slot and the idle time are stored. The distortion compensation coefficient update processing is performed using these data in the slot. However, in this method, the distortion compensation coefficient is only updated once per level in one TDMA frame period. That is, even if the same level appears n times, the distortion compensation coefficient is only updated once for that level. Therefore, it takes time to converge the distortion compensation coefficient.

Therefore, in the second embodiment, as shown in FIG. 11, the burst period T in which the time slot transmits data is shown.
b and a preamble period T placed before the burst period
When p is included, low speed data is input to the arithmetic / control unit 24 in the preamble period Tp, and the arithmetic / control unit 24 calculates and updates the distortion compensation coefficient in real time using the low speed data, and then in the burst period. Predistortion processing is performed on the data to be sent using the updated distortion compensation coefficient, the data is stored in the output buffer, and the data is sent during the burst period. At this time, the feedback data of the high-speed data sent in the burst period is stored, and the distortion compensation coefficient is calculated and updated in its own time slot and idle slot. As described above, since the distortion compensation coefficient is updated in real time using the low speed data, the distortion compensation coefficient can be converged in a short time because the update is performed a plurality of times in one slot.

FIG. 12 is a block diagram of the radio equipment of the second embodiment, in which the same parts as those of the first embodiment of FIG. 2 are designated by the same reference numerals. In FIG. 12, the difference from the first embodiment is that
In the preamble period Tp, low speed data (for example, 8k)
The point is that a data generating section 51 for generating low-speed data of bps) is provided, and the random data generating section 40 and the pseudo load 41 of the first embodiment are omitted.

When the start of communication is instructed by the microcomputer 38, the arithmetic / control section 24 sets the distortion compensation coefficient to the E ² PROM 25.
a or read from the battery backup RAM 25b and written in the internal distortion compensation coefficient storage unit. TDMA
Part 22 is the preamble period T assigned to itself
The low-speed data input from the data generator 51 is written in the input buffer 23 at p. The calculation / control unit 24 reads the low speed data every time the low speed data is written in the input buffer 23, and obtains a distortion compensation coefficient corresponding to the level of the data from the distortion compensation coefficient storage unit. Then, the arithmetic / control unit 24 performs predistortion processing on the data obtained by converting the transmission data into I and Q using the distortion compensation coefficient, and writes it in the output buffer 26. After that, the data written in the output buffer is immediately quadrature-modulated and transmitted. Also,
The transmission signal is quadrature detected and stored in the feedback buffer 37. The arithmetic / control unit 24 reads out and compares the low-speed data stored in the input buffer 23 and the demodulated data stored in the feedback buffer 37, and performs distortion compensation coefficient arithmetic processing so that the difference becomes zero. The old distortion compensation coefficient up to that point is updated with the calculated distortion compensation coefficient. Such distortion compensation coefficient update processing is executed in real time for all low speed data.

When the burst period approaches, at this time, the input buffer memory and the output buffer memory perform writing and reading for each sample, but a means for bypassing the buffer memory may be provided. The TDMA unit 22 writes the burst data in the input buffer 23, and the arithmetic / control unit 2
4 performs predistortion processing on the high-speed burst data one sample at a time and writes it in the output buffer 26. Thereafter, the data written in the output buffer is quadrature-modulated and transmitted in the burst period, and the transmission signal is quadrature-detected and sequentially stored in the feedback buffer 37. next,
The arithmetic / control unit 24 reads out the transmission data in the burst period stored in the input buffer 23 and the demodulation data stored in the feedback buffer 37 one sample at a time and compares them. The arithmetic processing is performed, and the distortion compensation coefficient up to that time is updated with the calculated distortion compensation coefficient. Such distortion compensation coefficient update processing is executed for all burst data.

After that, when the above operation is repeated and the communication is completed, the arithmetic / control section 24 stores the contents of the distortion compensation coefficient storage section in the nonvolatile memory 25a and the battery backup RA.
In each of the M25b, the distortion compensation coefficient is read from the battery backup RAM 25b and set in the internal distortion compensation coefficient storage unit 24a at the time of the next communication, and the above operation is executed.

(C) Third Embodiment (a) Configuration FIG. 13 is a configuration diagram of the third embodiment, in which the same parts as those in the first embodiment of FIG. 2 are designated by the same reference numerals. In FIG. 13, the point different from the first embodiment is that a reflected wave determination unit 52 for detecting the reflected wave reflected by the antenna and determining whether the reflected wave level is equal to or higher than a set value is provided, and the reflected wave level is set. When the value is equal to or more than the value, the arithmetic / control unit 24 does not update the distortion compensation coefficient.

(B) Operation When the reflected wave level is equal to or higher than the set value, it means that the characteristics of the antenna are changed and the input impedance is changed by a considerable amount. The distortion compensation coefficient is effective when the input impedance of the antenna is a predetermined value (for example, 50Ω). Therefore, the demodulated data when the reflected wave level is equal to or higher than the set value cannot be trusted, and the distortion compensation coefficient deviates from the optimum value when the distortion compensation coefficient update processing is performed. Therefore, in the third embodiment, when the reflected wave level is equal to or higher than the set value, the arithmetic / control unit 24 does not perform the distortion compensation coefficient updating process, and prevents the distortion compensation coefficient from deviating from the optimum value. . In the third embodiment, the initial setting operation of the distortion compensation coefficient to the non-volatile memory 25a, the distortion compensation processing during operation, and the distortion compensation coefficient updating processing are performed in exactly the same manner as in the first embodiment. During operation, the reflected wave determination unit 52 detects the reflected wave reflected by the antenna 31 via the directional coupler 32 and determines whether the reflected wave level is equal to or higher than a set value. When the reflected wave level becomes equal to or higher than the set value, the reflected wave determination unit 52 notifies the calculation / control unit 24.
Notify. As a result, the calculation / control unit 24 stops the distortion compensation coefficient updating process until the reflected wave level becomes equal to or lower than the set value.

(C) Modification FIG. 14 is a block diagram of a modification of the third embodiment. The difference from FIG. 13 is that the detection information is added to the demodulated data when the reflected wave level is equal to or higher than the set value. The demodulation data writing unit 53 for writing in the feedback buffer 37 is provided, and the calculation / control unit 24 does not calculate or update the distortion compensation coefficient for the demodulation data to which the detection information is added. During operation, the reflected wave determination unit 52 detects the reflected wave reflected by the antenna 31,
Determine whether the reflected wave level is above the set value. When the reflected wave level becomes equal to or higher than the set value, the reflected wave determination unit 52 notifies the demodulated data writing unit 53 to that effect. This allows
After that, the demodulation data writing unit 53 adds detection information to the demodulation data and writes the demodulation data in the buffer memory 37 until the reflected wave level becomes equal to or lower than the set value. When updating the distortion compensation coefficient, the arithmetic / control unit 24 checks whether or not the detection information is added to the demodulated data, updates the distortion compensation coefficient if not added, and if it is added, corrects the distortion. Do not update the compensation coefficient. It should be noted that the detection address is not added to the demodulated data, and the write address of the demodulated data when the reflected wave level is equal to or higher than the set value is clearly indicated to the operation / control unit 24, and the operation
The control unit can also be configured not to update the distortion compensation coefficient for the demodulated data of the address.

(D) Fourth Embodiment FIG. 15 is a block diagram of a radio apparatus according to the fourth embodiment. The same parts as those in the first embodiment of FIG. 2 are designated by the same reference numerals. FIG.
5, the difference from the first embodiment of FIG. 2 is that the input buffer, the output buffer, and the feedback buffer are removed.
A data generator 51 that generates low-speed data is provided, and the TDMA unit 22 inputs the low-speed data to the arithmetic / control unit 24 during the preamble period, and the arithmetic / control unit 24 does not update the distortion compensation coefficient. The point that an alarm unit 54 is provided to warn that the distortion compensation coefficient is not an appropriate value, the arithmetic / control unit 24 compares the low speed data and the demodulated data in real time during the preamble period, and the distortion based on the magnitude of the difference. The point is that the suitability of the compensation coefficient is determined, and if the difference is large and the distortion compensation coefficient is not an appropriate value, an alarm is output or data transmission is prohibited.

In the first embodiment, the transmission data is predistorted in the assigned time slot, the distortion-compensated data is transmitted, the demodulated data is stored, and the distortion compensation is performed in the self-slot idle time slot. Update the coefficient. However, the first embodiment requires an input buffer, an output buffer and a feedback buffer, resulting in high cost. Non-volatile memory (E ² PR
Since the distortion compensation coefficient is set in the OM) 25a so that the distortion characteristic of the wireless device can be compensated before factory shipment, the distortion compensation coefficient does not need to be updated unless the distortion characteristic of the wireless device changes. Therefore, in the third embodiment, each buffer is removed so that the distortion compensation coefficient updating process is not performed. However, if the distortion characteristic changes and the distortion compensation coefficient becomes an inappropriate value, the band is widened and adjacent interference occurs. Therefore, TD
The MA unit 22 inputs low-speed data to the arithmetic / control unit 24 during the preamble period, and the arithmetic / control unit 24 performs predistortion processing on the low-speed data and outputs the low-speed data, and compares the low-speed data and the demodulated data in real time. Then, distortion compensation calculation is performed, and the resulting distortion compensation coefficient is used for predistortion processing of the burst data. At this time,
Since the calculation is performed only during the preamble period, if the calculation is not in time and the distortion compensation coefficient calculation largely deviates, an alarm is output or data transmission is prohibited. By doing so, it is possible to remove the buffer and provide an inexpensive wireless device,
Moreover, the user can promptly recognize that the distortion compensation coefficient is no longer an appropriate value due to the characteristic variation of the transmission unit such as the transmission power amplifier, and can deal with it.

FIG. 16 is a processing flow of the arithmetic / control section 24. When the transmission data is received from the TDMA unit 22 (step 201), the arithmetic / control unit 24 performs pre-distortion processing after converting the transmission data into I and Q signals using the distortion compensation coefficient stored in the E ² PROM. (Step 202) and output (Step 203). The predistorted I and Q signals are input to the quadrature modulator 28 via the DA converter 27 and are orthogonally transformed. The orthogonally converted carrier wave is frequency converted, amplified by the transmission power amplifier 30, and radiated from the antenna. A part of the carrier wave is frequency-converted by the frequency converter 33 and the quadrature detector 34
Is input to the arithmetic / control unit 24 via the AD converter 35.

The arithmetic / control section 24 judges whether it is a preamble period or a burst period (step 204),
If it is not the preamble period, the processes from step 201 are repeated. However, in the preamble period, the low speed data and the demodulated data are compared in real time to perform the distortion compensation calculation to update the distortion compensation coefficient. (Step 20
5). When the difference is large and the distortion compensation coefficient cannot be met in time only during premamble, an alarm signal is input to the microcomputer 38 to generate an alarm or data transmission is stopped (steps 206 and 207). If the difference is small and the distortion compensation coefficient is an appropriate value, the processing from step 201 onward is repeated.
In the fourth embodiment, the nonvolatile memory (E ² PRO
M) When initially setting the distortion compensation coefficient in 25a, low-speed data is input to the arithmetic / control unit 24, the distortion compensation coefficient is updated in real time, and after it is converged, it is written in the nonvolatile memory.

(E) Fifth Embodiment FIG. 17 is a block diagram of the radio equipment of the fifth embodiment, in which the same parts as those in the first embodiment of FIG. 2 are designated by the same reference numerals. FIG.
7, the difference from the first embodiment of FIG. 2 is that the input buffer, the output buffer and the feedback buffer are removed.
The arithmetic / control unit 24 calculates and updates the distortion compensation coefficient in real time using partial data of the transmission data and demodulated data obtained by demodulating the modulated signal modulated by the data.

In the first embodiment, the transmission data is predistorted in the assigned time slot, the predistorted data is transmitted, the demodulated data is stored, and the data is spread over its own slot and idle time slot. The distortion compensation coefficient is updated. The reason why the distortion compensation coefficient is updated in the idle time slot is that the distortion compensation coefficient cannot be updated in real time because of high-speed transmission. But,
The first embodiment requires an input buffer, an output buffer and a feedback buffer, resulting in high cost. Therefore, in the fifth embodiment, for a part of the transmission data, for example, the distortion compensation coefficient is calculated and updated once in real time for n pieces of input data (n samples). By doing this, the distortion compensation coefficient can be updated in real time every n times even at high speed transmission,
Moreover, the input buffer, the output buffer and the feedback buffer can be omitted.

FIG. 18 is a processing flow of the arithmetic / control unit 24 in the fifth embodiment. When the start of communication is instructed, the arithmetic / control unit 24 reads the distortion compensation coefficient from the E ² PROM 25a or the battery backup RAM 25b and writes it in the internal distortion compensation coefficient storage unit (step 25).
1). Next, when the arithmetic / control unit 24 receives the transmission data from the TDMA unit 22, the arithmetic / control unit 24 converts the transmission data into I and Q signals (step 252), performs pre-distortion processing on the transmission data using the distortion compensation coefficient, and outputs (step 25).
3). The predistorted I and Q signals are D
The signal is input to the quadrature modulator 28 via the A converter 27 and subjected to quadrature conversion. The orthogonally converted carrier wave is frequency converted,
It is amplified by the transmission power amplifier 30 and radiated from the antenna 31. A part of the carrier wave is frequency-converted by the frequency converter 33 and input to the quadrature detector 34, demodulated into I and Q signals by the quadrature detector 34, and calculated / calculated via the AD converter 35.
It is input to the control unit 24.

The calculation / control unit 24 is adapted to update the distortion compensation coefficient in real time once every n samples.
It is determined whether or not the distortion compensation coefficient update processing needs to be performed on the present transmission data (step 254). If it is necessary to update the distortion compensation coefficient, the distortion compensation coefficient is updated using transmission data and demodulation data (step 25).
5). After that, or if it is not necessary to update the distortion compensation coefficient in step 254, the arithmetic / control unit 24 checks whether the communication is completed (step 25).
6) If not completed, the processes from step 252 are repeated. When the communication is completed, the arithmetic / control unit 24 stores the storage contents of the internal distortion compensation coefficient storage unit in each of the nonvolatile memory 25a and the battery backup RAM 25b (step 257). After that, in the next communication,
The distortion compensation coefficient is read from the battery backup RAM 25b and set in the internal distortion compensation coefficient storage unit, and the above operation is executed. With the above configuration, the input buffer, the output buffer, and the feedback buffer can be removed, and if the number of data in one time slot is N samples, the distortion compensation coefficient update process can be performed N / n times in real time. .

(F) Sixth Embodiment FIG. 19 is a block diagram of a radio apparatus according to the sixth embodiment. The same parts as those in the first embodiment of FIG. 2 are designated by the same reference numerals. FIG.
9 is different from that of the first embodiment in FIG. 2 in that a portion for demodulating a quadrature modulated signal and inputting demodulated data to the arithmetic / control unit 24 is prepared as an auxiliary device, and the portion can be detachably attached to a wireless device. The point is that connection can be made and the distortion compensation coefficient is not updated during operation. In the first embodiment, the transmission data is predistorted in the assigned time slot, the demodulated data that has been fed back is stored, and the distortion compensation coefficient is calculated and updated over the idle time slot. However, in the first embodiment, the portion (frequency converter 33, quadrature detector 34, AD
Since the converter 36 and the feedback buffer 37) are required, the cost increases and the size of the wireless device increases. Since the distortion compensation coefficient is initially set in the non-volatile memory (E ² PROM) 25a so that the distortion characteristic of the wireless device can be compensated before factory shipment, the distortion compensation coefficient must be the same if the distortion characteristic of the wireless device does not change. No need to update.

Therefore, in the sixth embodiment, the portion (frequency converter 33, quadrature detector 34, AD converter 3) that demodulates the quadrature modulated signal and inputs the demodulated data to the arithmetic / control unit 24.
5. Prepare the feedback buffer 37) as an accessory device 60,
The connectors 61a to 62b enable the accessory device to be detachably connected to the wireless device. Then, before shipment from the factory, the accessory device 60 and the pseudo load 41 are connected to the wireless device to converge the distortion compensation coefficient to a nonvolatile memory (E ² PROM).
25a or the battery backup RAM 25b is initialized, and then the accessory device 60 and the pseudo addition 41 are removed before shipment.

In operation, the arithmetic / control unit 24 uses the non-volatile memory 25a or the battery backup RAM.
The predistortion processing is performed using the distortion compensation coefficient set to 25b, and the distortion compensation coefficient update processing is not performed. When the distortion compensation coefficient is not an appropriate value due to the change in the characteristics of the wireless device, the user carries the wireless device to the manufacturer or the dealer and connects the accessory device 60 and the pseudo addition 41 to update the distortion compensation coefficient. Then, the value is converged to an appropriate value and then reset in the nonvolatile memory 25a. According to the above, when in use, accurate predistortion processing can be performed using the distortion compensation coefficient set in the non-volatile memory 25a, the spread of the band can be prevented, the adjacent channel leakage can be prevented, and low Price, weight and size can be reduced.

FIG. 20 shows a modification of the sixth embodiment. As in the fourth and fifth embodiments, the input buffer, the output buffer,
It is applicable to a wireless device having no feedback buffer, and the accessory device 60 includes a frequency converter 33 and a quadrature detector 3.
4 and AD converter 35. In this modification, the distortion compensation coefficient is set to the non-volatile memory (E ² PROM) 2
The initial setting to 5a is as follows. That is,
The accessory device 60 and the pseudo addition 41 are connected to a wireless device, low-speed data is generated from the data generation unit 51, and the distortion compensation coefficient is updated in real time by the calculation / control unit 24 using the low-speed data and the demodulated data. It converges to an appropriate value, and the converged distortion compensation coefficient is initialized to the non-volatile memory.

(G) Seventh Embodiment FIG. 21 is a block diagram of a radio apparatus according to the seventh embodiment. The same parts as those in the first embodiment of FIG. 2 are designated by the same reference numerals. FIG.
1 is different from the first embodiment of FIG. 2 in that the input buffer, the output buffer and the feedback buffer are removed.
A data generating unit 51 that generates low-speed data is provided, and the TDMA unit 22 inputs the low-speed data to the arithmetic / control unit 24 during the preamble period. The point is that the distortion compensation coefficient is updated in real time by using the. In the first embodiment, the transmission data is predistorted in the assigned time slot,
Data is transmitted, demodulated data is stored, and distortion compensation coefficient update processing is performed across idle time slots.
However, in such a method, the distortion compensation coefficient is only updated once per level over one TDMA frame period. That is, even if the same level appears n times, the distortion compensation coefficient is only updated once for that level.
Moreover, in the first embodiment, the input buffer, the output buffer,
A feedback buffer is required, resulting in high cost.

Therefore, in the seventh embodiment, each input buffer is removed, and low-speed data is input to the arithmetic / control unit 24 during the preamble period Tp of the time slot assigned to itself as shown in FIG. The / control unit 24 calculates and updates the distortion compensation coefficient in real time using the low-speed data only in the preamble feedback Tp, performs the predistortion processing in the burst period Tb, and does nothing in the idle time slot.

FIG. 23 is a processing flow of the arithmetic / control unit 24 of the seventh embodiment. When the transmission data is received from the TDMA unit 22 (step 301), the arithmetic / control unit 24 outputs E ²
Predistortion processing is performed on the transmission data using the distortion compensation coefficient stored in the PROM 25a (step 302) and output (step 303). The predistorted I and Q signals are input to the quadrature modulator 28 via the DA converter 27 and are orthogonally transformed. The orthogonally converted carrier wave is frequency-converted, and the transmission power amplifier 30
It is amplified by and is radiated from the antenna 31. A part of the carrier wave is frequency-converted by the frequency converter 33 and the quadrature detector 34
Is input to the arithmetic / control unit 24 via the AD converter 35.

The arithmetic / control section 24 determines whether it is a preamble period or a burst period (step 304),
If it is in the preamble period, the distortion compensation coefficient is calculated and calculated in real time using the low speed data and the demodulated data and updated (step 305). After that, or if it is not in the preamble period in step 304, the arithmetic / control unit 24 checks whether the communication is completed (step 306), and if not completed, the processes from step 301 are repeated. When the communication is completed, the arithmetic / control unit 24 stores the updated distortion compensation coefficient in each of the non-volatile memory 25a and the battery backup RAM 25b (step 307). After that, at the next communication, the distortion compensation coefficient is read from the battery backup RAM 25b, set in the internal distortion compensation coefficient storage unit, and the above operation is executed. In the seventh embodiment, the nonvolatile memory (E ² P
When the distortion compensation coefficient is initially set in the ROM 25a, the low speed data is input to the arithmetic / control unit 24, the distortion compensation coefficient is updated in real time, and after it is converged, it is written in the nonvolatile memory.

The above is the case where the radio device transmits burst data in one assigned time slot, but the case of transmitting data in a plurality of time slots as in the base station device of a mobile radio system is also illustrated. 21 can be applied. That is, when transmitting data in a plurality of time slots, low speed data is input to the arithmetic control unit 24 in a predetermined empty time slot, and the arithmetic / control unit 24 uses the low speed data and demodulated data in real time to correct the distortion compensation coefficient. Is updated, high-speed data is subjected to pre-distortion processing and transmitted in a time slot other than an empty time slot. An identification signal indicating whether or not the channel is a low speed data insertion channel is input from the TDMA unit 22 to the arithmetic / control unit 24.

FIG. 24 is a processing flow of the arithmetic / control unit 24 when transmitting data in a plurality of time slots. When the communication start is instructed, the calculation / control unit 2
Reference numeral 4 reads the distortion compensation coefficient from the E ² PROM 25a or the battery backup RAM 25b and writes it in the internal distortion compensation coefficient storage unit (step 351). Then
Upon receiving the data from the TDMA unit 22, the arithmetic / control unit 24 performs predistortion processing on the data using the distortion compensation coefficient and outputs the data (step 352). The pre-distortion processed I and Q signals are DA converter 27.
Is input to the quadrature modulator 28 and is subjected to quadrature conversion.
The orthogonally converted carrier wave is frequency-converted, amplified by the transmission power amplifier 30, and emitted from the antenna 31. A part of the carrier wave is frequency-converted by the frequency converter 33, input to the quadrature detector 34, demodulated into I and Q signals, and input to the arithmetic / control unit 24 via the AD converter 35.

The arithmetic / control section 24 judges whether or not the current channel (time slot) is the low speed data insertion channel (step 353).
The distortion compensation coefficient is calculated and updated using the low speed data and the demodulated data (step 354). After a while
Alternatively, if the current channel is not the low-speed data insertion channel in step 353, the arithmetic / control unit 24 checks whether the communication is completed (step 355), and if not completed, the processes of step 352 and thereafter are repeated. When the communication is completed, the arithmetic / control unit 24 stores the updated distortion compensation coefficient in each of the non-volatile memory 25a and the battery backup RAM 25b (step 35).
6). After that, in the next communication, the distortion compensation coefficient is read from the battery backup RAM 25b and the above operation is executed. As described above, even a wireless device that transmits data in a plurality of time slots can start transmission by using a distortion correction coefficient corresponding to the transmission characteristics of the device and emit a radio wave with a wide band. Can be prevented, and the time until convergence to the optimum distortion compensation coefficient can be shortened.

(H) Eighth Embodiment FIG. 25 is a block diagram of a radio apparatus according to the eighth embodiment. The same parts as those in the first embodiment of FIG. 2 are designated by the same reference numerals. FIG.
5, the difference from the first embodiment of FIG. 2 is that a temperature sensor 65 that detects the ambient temperature, a voltage monitoring unit 66 that monitors the power supply voltage, and a management unit 67 that manages the channel frequency / transmission power are provided. A plurality of distortion compensation coefficients for ambient temperature, power supply voltage, channel frequency / transmission power, respectively, are stored in the non-volatile memory (E ² PROM) 25a or the battery backup RAM 25b, and the operation / control unit 24 is The point is that the predistortion processing and the distortion compensation coefficient updating processing are performed using the distortion compensation coefficient according to the state (channel frequency / transmission power, ambient temperature, power supply voltage).

Since the distortion characteristic of the transmitter changes depending on the ambient temperature, the power supply voltage, the channel frequency / transmission power, a plurality of distortion compensation coefficients are stored in the nonvolatile memory for each of the ambient temperature, the power supply voltage and the channel frequency / transmission power. If the distortion compensation coefficient according to the ambient temperature, the power supply voltage, the channel frequency / transmission power during communication is used, the distortion compensation coefficient converges in a short time, and good communication is possible. Therefore, in the eighth embodiment, a plurality of distortion compensation coefficients are initially set in the nonvolatile memory 25a for each of the channel frequency / transmission power, the ambient temperature, and the power supply voltage, and the arithmetic / control unit 24 is set to the State (channel frequency / transmit power,
Predistortion processing and distortion compensation coefficient update processing are performed using distortion compensation coefficients corresponding to ambient temperature and power supply voltage, and at the end of communication, the old distortion compensation coefficient in the non-volatile memory is rewritten with the updated distortion compensation coefficient. It should be noted that the ambient temperature only, the power supply voltage only, the channel frequency / transmission power only, or the distortion compensation coefficient according to any combination thereof is stored in the non-volatile memory, and these are used to perform the predistortion processing and the distortion compensation coefficient updating processing. You can also do

In FIG. 26A, the distortion compensation coefficient Hij is stored in the nonvolatile memory 25 in correspondence with various channel frequencies / transmission powers.
In this example, Hij is the distortion compensation coefficient h of each level.
(pi) (see FIG. 4). In FIG. 26B, the distortion compensation coefficient Hi is stored in the nonvolatile memory 25 in correspondence with various temperatures.
In this example, Hi is set to a, and Hi is the distortion compensation coefficient h of each level.
It is composed of (pi). FIG. 26C shows an example in which the distortion compensation coefficient Hi 'is set in the non-volatile memory 25a corresponding to various power supply voltages, and Hi' is the distortion compensation coefficient h (p
i).

(I) Ninth Embodiment FIG. 27 is a block diagram of a radio apparatus according to the ninth embodiment, and the same parts as those in the first embodiment of FIG. 2 are designated by the same reference numerals. FIG.
7, a difference from the first embodiment of FIG. 2 is that a directional coupler 71 that detects a traveling wave and a reflected wave, detection circuits 72 and 73 that detect the traveling wave and the reflected wave, a voltage divider 74, and an antenna. Voltage standing wave ratio VSWR (Voltage Standing Wave Ra
tio) is provided with a determination circuit 75 for determining whether it is less than or equal to a set value, and a plurality of distortion compensation coefficients are provided in advance in a nonvolatile memory (E ² PROM) 2 corresponding to the voltage standing wave ratio.
5a or battery backup RAM 25b, and the arithmetic / control unit 24 performs predistortion processing and distortion compensation coefficient updating processing using the distortion compensation coefficient according to the voltage standing wave ratio VSWR when in use. Is.

The directional coupler 71 is provided between the transmission power amplifier 30 and the antenna 31, and detects a traveling wave and a reflected wave to the antenna. Each of the detection circuits 72 and 73 is composed of a diode and a capacitor, and detects a traveling wave and a reflected wave. Voltage divider 74
Divides the input voltage in half. The determination circuit 75 is composed of an operational amplifier, receives the detected traveling wave voltage Es and reflected wave voltage Er, and receives the voltage standing wave ratio V of the antenna 31.
It is determined whether the SWR is less than or equal to a set value (eg, 3) or more. The voltage standing wave ratio VSWR is expressed by the following equation VSWR = (1+ | Γ |) / (1- | Γ |) where Γ is a reflection coefficient and is obtained by Γ = reflected wave voltage Er / traveling wave voltage Es. Therefore, when Er = Es / 2, the voltage standing wave ratio VSWR is VSWR = (1 + 0.5) / (1-0.5) = 3. Since the traveling wave voltage Es is halved by the voltage divider 74, the operational amplifier of the determination circuit 75 becomes a high level or a low level with VSWR = 3 as a boundary, and the voltage standing wave ratio VSWR is equal to or less than the set value (= 3). Or more can be determined. still,
The outputs of the detection circuits 72 and 73 can be AD-converted, and the operation of the above equation can be executed to finely determine the VSWR.

In advance, as shown in FIG. 28, VSWR is 3
The distortion compensation coefficient in the above case and in the case of 3 or less is set in the non-volatile memory (E ² PROM) 25a. Various V
The distortion compensation coefficient according to the SWR is obtained by changing the impedance of the pseudo load connected instead of the antenna. The arithmetic / control unit 24 performs predistortion processing and distortion compensation coefficient update processing using the distortion compensation coefficient corresponding to the VSWR at the time of use, and at the end of communication, the updated distortion compensation coefficient is stored in the non-volatile memory 25a. Rewrite the old distortion compensation coefficient. According to the above, the predistortion process can be performed using the optimum distortion compensation coefficient according to the characteristic state of the antenna, and the convergence time of the distortion compensation coefficient can be shortened.

(J) Tenth Embodiment The above is the case where the offsets of the quadrature modulator and the quadrature detector are not taken into consideration.
As described with reference to FIG. 40, accurate predistortion processing and calculation and update of distortion compensation coefficients cannot be performed. Therefore, when there is an offset in the quadrature modulator and the quadrature detector, it is necessary to compensate the offset before performing the predistortion process and the distortion compensation coefficient updating process. No quadrature modulation output should be output when there is no modulation. However, if there is an offset in the quadrature modulator, carriers proportional to the offset amount leak as shown in FIG. Therefore, the first
In the 0th embodiment, this leakage carrier is detected, and the I and Q input levels of the quadrature modulator are finely adjusted so that the value thereof is minimized to adjust the transmission side offset. That is, this transmission offset is canceled before the original distortion compensation operation is started.

FIG. 30 is a block diagram of the tenth embodiment of the present invention, in which the same parts as those in the first embodiment of FIG. 2 are designated by the same reference numerals. 30, the difference from the first embodiment of FIG. 2 is that a transmission offset detection unit 81 that detects a leakage carrier from the quadrature modulator 28 to detect a transmission offset is provided, and the TDMA unit 22 is assigned. That is, the signal is not output during the preamble period of the assigned time slot and the non-modulation state is set, and the arithmetic / control unit 24 performs the offset compensation process in addition to the predistortion process and the distortion compensation coefficient update process. In the transmission offset detection unit 81, 81a is a hybrid for extracting leakage carriers due to offset, 81b is a bandpass filter, 81
c is an amplifier, 81d is a detector, and 81e is an AD converter.

The TDMA section 22 does not output a signal during the preamble period of the allocated time slot and puts it in a non-modulation state. During such a preamble period (when no modulation is performed), the leak carrier leaking from the quadrature modulator 28 is removed by the hybrid 8
The signal is extracted by 1a, band-limited by a bandpass filter 81b, amplified by an amplifier 81c and input to a detector 81d. The detector 81d detects the leak carrier and converts it into a DC signal, and the AD converter 81e converts the DC signal into digital offset data and inputs it to the arithmetic / control unit 24. The arithmetic / control unit 24 is in the preamble period (when there is no modulation)
Based on the offset data input in I,
Finely adjust the output level of the Q signal. After that, if the above process is repeated, the offset data gradually approaches zero, and finally the output level adjustment value (offset compensation coefficient) of the I and Q signals converges to the optimum value.

When the offset compensation coefficient converges in the preamble period (when the offset data becomes zero),
The arithmetic / control unit 24 performs predistortion processing on the transmission data from its own time slot, separates it into I and Q signals, and updates the distortion compensation coefficient over the idle time slots. Then, the latest distortion compensation coefficient and the latest offset compensation coefficient updated at the end of communication are stored in the non-volatile memory (E ² PROM) 25a and the battery backup RAM 25b. Then, at the time of the next communication, the offset compensation processing is started using the offset compensation coefficient stored in the non-volatile memory (E ² PROM) 25a and the battery backup RAM 25b.

If the offset compensation coefficient does not converge during the preamble period, the predistortion processing in this time slot is abandoned and the nonvolatile memory 2
5a or the distortion compensation coefficient stored in the battery backup RAM 25b is used for predistortion processing and input to the quadrature modulator, and the distortion compensation coefficient is not updated. As described above, since the predistortion process and the distortion compensation coefficient update process are performed after the offset is removed by the offset compensation process, the correct predistortion process can be performed and good communication can be promptly performed. In addition, the latest offset compensation coefficient value is stored in the non-volatile memory or the battery backup RAM, and the offset processing is started in the next communication by using the offset compensation value. Therefore, the offset compensation coefficient can be converged in a short time. The predistortion process and the distortion compensation coefficient update process can be started.

(K) Eleventh Embodiment (a) Configuration In the tenth embodiment, the offset (transmission offset) of the quadrature modulator is compensated. Similarly, the offset (reception offset) of the quadrature detector is measured. It is possible to perform offset compensation so that the reception offset becomes zero, or perform offset compensation processing so that both offsets become zero at the same time. FIG. 31 is a block diagram of a radio apparatus of the eleventh embodiment for compensating the transmission offset and the reception offset, and the same parts as those of the first embodiment of FIG. 2 are designated by the same reference numerals.
The eleventh embodiment differs from the first embodiment in FIG. 2 in that a phase shifter 91 for shifting the phase of the reference carrier wave input to the quadrature modulator 28 is provided, and the phase shift amount of the phase shifter is calculated. / A point to be changed via the DA converter 92 according to an instruction from the control section 24. The arithmetic / control section 24 performs offset compensation processing in addition to predistortion processing and distortion compensation coefficient update processing. The part 24 is that the transmission offset and the reception offset are measured in the preamble period of the allocated time slot, and the respective offset compensation processes are performed.

FIG. 32 is a detailed view of the dotted line portion of FIG. 31, where 28 is a quadrature modulator, 34 is a quadrature detector, and 43 is a PL.
Reference carrier generator of L configuration, 44 is a hybrid circuit for branching the reference carrier into a quadrature modulator and a quadrature detector, 9
1 is a phase shifter, and 92 is a DA converter. The phase shifter 91 follows the quadrature modulator 28 according to the instruction from the arithmetic / control unit 24.
The phase of the reference carrier wave input to is shifted. In the quadrature modulator 28, 28 a is a phase shifter for shifting the reference carrier wave output from the phase shifter 91 by 90 ⁰ , 28 b is a multiplier for multiplying the I signal by the output signal of the phase shifter 91, and 28 c is a Q signal. to a multiplier for multiplying the output signal of the 90 ⁰ phase-shifted phase shifter 91. The signals multiplied by the multipliers are combined and output. In the quadrature detector 34, 34a is a phase shifter that shifts the reference carrier wave by 90 ⁰ , 34b is a multiplier that multiplies the input signal by the reference carrier wave and outputs an I signal, and 34c is 90 ⁰ phase shifted by the input signal. It is a multiplier that multiplies a reference carrier and outputs a Q signal.

(B) Transmission offset and reception offset detection principle When the input of the quadrature modulator 28 is unmodulated in the distortion compensation system, the baseband signal detected by the quadrature detector 34 is shown on the complex plane. 33. That is,
The offset component b of the quadrature modulator 28 and the offset component a of the quadrature detector are superimposed, and the offset indicated by c appears. It is impossible to measure each of these offset components by the usual means. In the present invention, each offset amount is measured as follows. When the phase of the reference carrier wave input to the quadrature modulation 28 is shifted by 0 to 360 °,
The phase of the carrier is rotated by the transmission side offset b.
Therefore, the offset component b of the quadrature modulator 28 in the baseband signal detected by the quadrature detector 34 rotates as shown in FIG.

In this way, if the detection output can be rotated from 0 to 360 ⁰ on the I and Q planes, the respective maximum values Vimax, Vqmax and minimum value V of the I and Q signals at that time are obtained.
imin, Vqmin is measured, and the maximum value Vimax, Vqmax and minimum value V
Offsets ΔVi and ΔV are calculated by the following equation using imin and Vqmin.
q can be obtained. ΔVi = (Vimax + Vimin) / 2 (1) ΔVq = (Vqmax + Vqmin) / 2 (2) By performing the above equation, the offset a of the quadrature detector shown by the broken line in FIG. 34 can be recognized. . Then, with the phase shift amount of the reference carrier being zero, the I / Q signals are input to the quadrature modulator 28 from the arithmetic / control unit 24, and as shown in FIG. The I and Q signals of the large circle) are detected and output. That is, the arithmetic / control unit 24 sets I, so that the detection output draws a unit circle.
The Q signal is controlled and input to the quadrature modulator 28. By doing so, the total offset of the modulation and detection system can be obtained by the equations (1) and (2). Then, the offset of the quadrature modulator (transmission offset) is obtained by complexly subtracting the already obtained offset of the detector from the total offset. The transmission off can be obtained by the transmission off detection unit in FIG.

(C) Operation In the preamble period, the arithmetic / control unit 24 performs the control explained in the above principle, first obtains the reception offset, then obtains the total offset, and subtracts the reception offset from the total offset. Calculate the transmission offset.
Then, based on the transmission offset, the same offset compensation processing as in the tenth embodiment is performed to adjust the I and Q signal levels. Also, the input levels of the I and Q signals demodulated based on the reception offset are finely adjusted. After that, if the above process is repeated, the transmission offset and the reception offset gradually approach zero, and finally the transmission offset compensation coefficient and the input level adjustment value (reception offset compensation coefficient) of the demodulated data converge to the optimum values.

When the offset compensation coefficient converges in the preamble period (when the transmission offset and the reception offset become zero), the arithmetic / control unit 24 performs predistortion processing on the transmission data from its next time slot and outputs it. , Calculate and update the distortion compensation coefficient over the idle time slot. Then, the latest distortion compensation coefficient updated at the end of communication, the latest transmission offset compensation coefficient,
The reception offset compensation coefficient is stored in a non-volatile memory (E ² PRO
M) 25a and battery backup RAM 25b
To be stored. Then, at the time of the next communication, the offset compensation processing is started using the transmission offset compensation coefficient and the reception offset compensation coefficient stored in the non-volatile memory (E ² PROM) 25a and the battery backup RAM 25b.

If each offset compensation coefficient does not converge in the preamble period, the predistortion processing in this time slot is abandoned and the nonvolatile memory 2
5a or the distortion compensation coefficient stored in the battery backup RAM 25b is used for predistortion processing and input to the quadrature modulator, and the distortion compensation coefficient is not updated. As described above, since each offset is removed by the offset compensation processing and the distortion compensation coefficient updating processing is performed, correct predistortion processing can be performed and good communication can be promptly performed. Further, the latest transmission / reception offset compensation coefficient values are stored in the non-volatile memory or the battery backup RAM, and the offset processing is started in the next communication by using the offset compensation values. It is possible to converge and start the predistortion processing and the distortion compensation coefficient updating processing. As described above, the present invention has been described with reference to the embodiments. However, the present invention can be variously modified in accordance with the gist of the present invention described in the claims, and the present invention does not exclude these.

[0094]

As described above, according to the present invention, the distortion compensation coefficient for suppressing the non-linear distortion of the transmission power amplifier or the like and reducing the adjacent channel leakage power is obtained in advance and initially set in the non-volatile storage means. Sometimes, the distortion compensation coefficient is updated starting from the distortion compensation coefficient, so that the distortion compensation coefficient converges to the optimum value in a short time, and the correct predistortion processing according to the operating state can be performed, and the spread of the band is suppressed. Adjacent channel leakage power can be reduced. Further, since the latest distortion compensation coefficient is stored in the storage means at the end of communication and used in the next communication, the distortion compensation coefficient can be converged to the optimum value in a short time at the next communication.

According to the present invention, before the allocated time slot, the arithmetic / control section performs predistortion processing on the input data and stores it in the output buffer memory,
The quadrature modulator performs quadrature modulation based on the data stored in the output buffer, the power amplifier amplifies the carrier and radiates it into the air from the antenna in the assigned time slot, and the quadrature detector detects the carrier. Stored in the feedback buffer memory, and the arithmetic / control unit spans the allocated time slot and idle time slot,
The distortion compensation coefficient is calculated and updated using the transmission data and the demodulation data. Since this is done, it is certain that 1 TDMA
In the frame period, the distortion compensation coefficient update processing can be performed, and the predistortion processing can be performed using the updated distortion compensation coefficient in the next self-assigned time slot.

According to the present invention, when the own time slot in the next TDMA frame period is approaching, calculation /
Since the control unit terminates the distortion compensation coefficient updating process, even if the distortion compensation coefficient cannot be updated in the idle time slot for all input data due to the high transmission rate, the arithmetic / control unit does the predistortion processing. And the distortion compensation coefficient updating process can be continued without confusion. According to the present invention, the arithmetic / control unit performs the distortion compensation coefficient updating process for each level of the transmission data when updating the distortion compensation coefficient, and the transmission data of the level already updated in the TDMA frame period is Since the distortion compensation coefficient calculation is omitted in the TDMA period, the number of times the distortion compensation coefficient is calculated and updated can be reduced, and the distortion compensation coefficient can be sufficiently updated even when the transmission speed becomes high. Therefore, high speed transmission can be supported.

According to the present invention, the TDMA unit inputs low speed data to the arithmetic / control unit during the preamble period, and the arithmetic / control unit calculates the distortion compensation coefficient in real time using the low speed data input during the preamble period. Updated again,
Save the high speed data input during the burst period,
Since the distortion compensation coefficient is calculated and updated over its own time slot and idle slot, the distortion compensation coefficient can be converged in a short time. According to the present invention, the reflected wave reflected by the antenna is detected, and when the reflected wave level in the data transmission burst period is equal to or higher than the set value, the calculation / control unit does not perform the distortion compensation coefficient updating process, so that the distortion occurs. It is possible to prevent the compensation coefficient from becoming inaccurate. According to the present invention, a plurality of distortion compensation coefficients are stored in the non-volatile storage means for each of the channel frequency / transmission power, ambient temperature, power supply voltage, and VSWR of the antenna, and the arithmetic / control unit is configured to store the distortion compensation coefficient at the time of use. Since distortion compensation and distortion compensation coefficient update processing are performed using the distortion compensation coefficient according to the state (channel frequency / transmission power, ambient temperature, power supply voltage, VSWR),
The convergence time of the distortion compensation coefficient can be shortened even when the state of use changes.

According to the present invention, the TDMA unit inputs low speed data to the operation / control unit during the preamble period and communication data to the burst period, and the operation / control unit receives the low speed data and the demodulated data in real time during the preamble period. Comparing the differences, the distortion compensation coefficient is calculated and updated based on the difference and the suitability is determined.If the difference is large and the distortion compensation coefficient is not an appropriate value, an alarm is output or data transmission is prohibited. Therefore, various buffers can be removed in order to perform the adequacy determination in real time, and moreover, the user can quickly recognize that the distortion compensation coefficient is no longer an appropriate value due to the characteristic variation of the transmission unit such as the transmission power amplifier. Can be dealt with. According to the present invention, the arithmetic / control unit performs predistortion processing on the transmission data by using the distortion compensation coefficient, and demodulates data obtained by demodulating a part of the transmission data and a modulation signal modulated by the data. Since the distortion compensation coefficient is calculated and updated in real time by using and, if the number of data in one time slot is N samples, the distortion compensation coefficient update processing can be performed in N / n times in real time. It is possible to accelerate the coefficient convergence.

According to the present invention, the part for demodulating the carrier wave and feeding back the demodulated data to the arithmetic / control part is prepared as an auxiliary device, and the part can be detachably connected to the radio device. Before shipment, the accessory device and pseudo load are connected to the wireless device to converge the distortion compensation coefficient and initialize to the non-volatile storage means, after which the accessory device can be removed and shipped, and the non-volatile storage means when used. Since the accurate predistortion processing can be performed by using the distortion compensation coefficient stored in, it is possible to reduce the cost, the weight, and the size. According to the present invention, the TDMA unit inputs low-speed data in the preamble period and communication data in the burst period to the arithmetic / control unit, and the arithmetic / control unit uses the distortion compensation coefficient stored in the non-volatile storage means. Predistortion processing is applied to communication data, and the distortion compensation coefficient is updated in real time using low-speed data and demodulated data in the preamble period, so there is no need to update distortion compensation coefficient using high-speed data. Therefore, various buffers can be removed, and the convergence time of the distortion compensation coefficient can be shortened.

According to the present invention, when data is transmitted in a plurality of time slots like a base station apparatus of a mobile radio system, a predetermined time slot (eg, the first time slot) is transmitted.
The data transmitted in the time slot) and the demodulated data are stored, and the calculation / control unit performs the distortion compensation coefficient update processing using the transmitted data and the demodulated data in the time slot other than the predetermined time slot. A wireless device that transmits data in a plurality of time slots can also perform predistortion processing and distortion compensation coefficient updating processing using the distortion compensation coefficient stored in the non-volatile storage means, and can converge the distortion compensation coefficient in a short time. it can. According to the present invention, when transmitting data in a plurality of time slots as in a base station device of a mobile radio system, low-speed data is inserted in a predetermined empty time slot, and the arithmetic / control unit operates at low speed in the empty time slot. Since the distortion compensation coefficient is updated using the data and demodulated data, it is not necessary to update the distortion compensation coefficient using high-speed data, so various buffers can be removed and the distortion compensation coefficient converges. The time can be shortened.

According to the present invention, the distortion compensation coefficient calculation and update processing are performed after eliminating the influence of the quadrature modulator offset (transmission offset) and the quadrature detector offset (reception offset). Pre-distortion and distortion compensation coefficient update processing can be performed. According to the present invention,
A non-volatile storage means or a battery-backed storage means for storing level adjustment values (transmission offset compensation coefficient, reception offset compensation coefficient) for compensating each offset is provided, and the latest offset compensation coefficient is non-volatile at the end of communication. Since the offset compensation processing is started by using the offset compensation coefficients stored in the storage means and stored in the nonvolatile storage means at the time of communication, the offset compensation can be converged in a short time.
Therefore, the start time of the predistortion processing and the distortion compensation coefficient updating processing can be advanced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a configuration diagram of a wireless device according to a first embodiment.

FIG. 3 is a configuration diagram of a quadrature modulator and a quadrature detector.

FIG. 4 is a functional block configuration diagram of a calculation / control unit.

FIG. 5 is a time chart showing processing timing.

FIG. 6 is a processing flow of a calculation / control unit.

FIG. 7 is an explanatory diagram for transmitting data in a plurality of time slots.

FIG. 8 is a processing flow of an arithmetic / control unit of a wireless device that transmits data in a plurality of time slots.

FIG. 9 is an explanatory diagram of stored contents of a distortion compensation coefficient storage unit when the distortion compensation coefficient update process is omitted when the levels are the same.

FIG. 10 is a flowchart of a distortion compensation coefficient updating process.

FIG. 11 is an explanatory diagram of the second embodiment.

FIG. 12 is a configuration diagram of a wireless device of a second embodiment.

FIG. 13 is a configuration diagram of a wireless device of a third embodiment.

FIG. 14 is a configuration diagram of a wireless device that is a modification of the third embodiment.

FIG. 15 is a configuration diagram of a wireless device of a fourth embodiment.

FIG. 16 is a processing flow of a calculation / control unit in the fourth embodiment.

FIG. 17 is a configuration diagram of a wireless device of a fifth embodiment.

FIG. 18 is a processing flow of a calculation / control unit in the fifth embodiment.

FIG. 19 is a configuration diagram of a wireless device of a sixth embodiment.

FIG. 20 is a configuration diagram of a wireless device that is a modification of the sixth embodiment.

FIG. 21 is a configuration diagram of a wireless device of a seventh embodiment.

FIG. 22 is an explanatory diagram of the seventh embodiment.

FIG. 23 is a processing flow of a calculation / control unit in the seventh embodiment.

FIG. 24 is a processing flow of a calculation / control unit when data is transmitted in a plurality of time slots.

FIG. 25 is a configuration diagram of a wireless device of an eighth embodiment.

FIG. 26 is an explanatory diagram of distortion compensation coefficients.

FIG. 27 is a configuration diagram of a wireless device according to a ninth embodiment.

FIG. 28 is an explanatory diagram of distortion compensation coefficients according to the ninth embodiment.

FIG. 29 is an explanatory diagram showing an output on a complex plane during no modulation.

FIG. 30 is a configuration diagram of a wireless device of a tenth embodiment.

FIG. 31 is a configuration diagram of a wireless device according to an eleventh embodiment.

[Fig. 32] Fig. 32 is a configuration diagram around a quadrature modulator and a quadrature detector.

FIG. 33 is an offset explanatory diagram of a quadrature detector and a quadrature modulator.

FIG. 34 is an explanatory diagram showing a phase rotation of a baseband output in a quadrature detector.

FIG. 35 is an explanatory diagram of a total offset of a modulation system and a detection system.

FIG. 36 is a block diagram of a conventional transmitter.

FIG. 37 is a diagram illustrating a problem caused by non-linearity of the transmission power amplifier.

[Fig. 38] Fig. 38 is a configuration diagram of a transmission device having a conventional digital nonlinear distortion compensation function.

FIG. 39 is a functional block diagram of a calculation / control unit.

FIG. 40 is an explanatory diagram showing a QPSK modulated wave on a complex plane.

[Explanation of symbols]

21 CODEC 22 TDMA unit 23 input buffer memory 24 arithmetic / control unit (distortion compensating unit) composed of DSP 25 non-volatile storage means or battery-backed storage means 26 DA converter 28 quadrature modulator 30 transmission power amplifier 32 Directional combiner 34 Quadrature detector 35 AD converter 36 Feedback buffer memory for storing demodulated data

Claims (28)

[Claims] 1. A TDMA wireless device that amplifies a carrier wave modulated by a digital modulation method with a transmission power amplifier and transmits the carrier wave. Alternatively, using a battery-backed storage means, a predistortion process is performed on the modulated signal using the distortion compensation coefficient stored in the storage means, and a demodulated signal obtained by branch demodulating the transmitted carrier output is used. A radio apparatus comprising a calculation / control unit for updating a distortion compensation coefficient. 2. The radio apparatus according to claim 1, wherein the contents of the storage means are rewritten with the latest distortion compensation coefficient at the end of communication. 3. The antenna of the wireless device is removed, the output of the wireless device is terminated by a pseudo load having the same input impedance as that of the antenna, and the arithmetic / control unit branches and demodulates the transmitted modulated signal and carrier wave output. The distortion compensation coefficient of the amplifier is calculated and updated by comparing with the obtained demodulated signal, and thereafter, the converged distortion compensation coefficient is stored in the storage means by repeating the predistortion processing and the calculation and update processing of the distortion compensation coefficient. The wireless device according to claim 1, wherein: 4. Before the assigned timeslot,
First data storage means for storing the data of the modulated signal that has been subjected to the predistortion processing by the arithmetic / control section, the carrier modulated by the data stored in the first data storage means is amplified and assigned A transmission section for transmitting in a time slot; and a second data storage section for feeding back a carrier wave branched from the transmission section and storing demodulated data obtained by quadrature demodulation, wherein the arithmetic / control section has an assigned time slot. 2. The radio apparatus according to claim 1, wherein the distortion compensation coefficient calculation and update processing are performed over idle time slots. 5. The calculation / control unit executes a distortion compensation coefficient updating process for each level of the modulated signal, and for transmission data of a level already updated during the TDMA frame period, the distortion compensation coefficient during the TDMA period. The wireless device according to claim 4, wherein calculation is omitted. 6. A monitoring unit for monitoring that the own time slot is approaching in the next TDMA frame period is provided, and when it is detected that the own time slot is approaching, the distortion compensation coefficient of the operation / control unit is set. The wireless device according to claim 4, wherein the calculation and update processing are terminated. 7. When the time slot has a burst period for transmitting data and a preamble period placed before the burst period, the time slot comprises means for inputting low-speed data to the arithmetic / control unit, The control unit calculates and updates the distortion compensation coefficient in real time using the low speed data input in the preamble period, and then outputs the high speed data output in the burst period by predistorting with the obtained distortion compensation coefficient. The radio apparatus according to claim 4, wherein the distortion compensation coefficient is calculated and updated over its own time slot and idle slot. 8. The calculation / control section comprises: a reflected wave detecting means for detecting a reflected wave reflected by an antenna of a wireless device; and a reflected wave judging section for judging whether a reflected wave level in a data transmission burst period is a set value or more. The wireless device according to claim 4, wherein the distortion compensation coefficient update process is not performed when the reflected wave level is equal to or higher than a set value. 9. A reflected wave detecting means for detecting a reflected wave reflected by an antenna of a wireless device, a reflected wave judging section for judging whether a reflected wave level in a data transmission burst period is a set value or more, and a reflected wave level is a set value. The calculation / control unit does not perform the distortion compensation coefficient update processing by using the demodulated data when the reflected wave level is equal to or higher than the set value. The wireless device according to claim 4. 10. A temperature detection means for detecting an ambient temperature is provided, and a distortion compensation coefficient is stored in the storage means for each temperature.
The wireless device according to claim 1, wherein the arithmetic / control unit performs the predistortion processing and the distortion compensation coefficient updating processing by using the distortion compensation coefficient according to the ambient temperature during operation. 11. A power supply voltage detecting means for detecting a power supply voltage is provided, a predistortion coefficient is stored in the storage means for each power supply voltage value, and the calculation / control section is a distortion compensation coefficient according to the power supply voltage during operation. The radio apparatus according to claim 1, wherein the predistortion processing and the distortion compensation coefficient updating processing are performed using the. 12. A distortion compensation coefficient is stored in the storage means according to a combination of transmission frequency and transmission power, and the arithmetic / control unit uses the distortion compensation coefficient according to the transmission frequency and transmission power at the time of data transmission. The radio apparatus according to claim 1, wherein distortion processing and distortion compensation coefficient updating processing are performed. 13. A means for detecting a traveling wave and a reflected wave to the antenna provided between the transmission power amplifier and the antenna, a detecting means for detecting the traveling wave and the reflected wave, and a detector for detecting the traveling wave and the reflected wave. A means for calculating the voltage standing wave ratio of the antenna by each voltage is provided, and the distortion compensation coefficient is stored in advance in the storage means in association with various voltage standing wave ratios, and the arithmetic / control unit is operated to maintain the voltage standing wave ratio. The radio apparatus according to claim 1, wherein the predistortion processing and the distortion compensation coefficient updating processing are performed using the distortion compensation coefficient according to the wave ratio. 14. A TDMA type amplifier for amplifying and transmitting a carrier wave modulated by a digital modulation method by a transmission power amplifier, a non-volatile storage means or a battery for storing beforehand a distortion compensation coefficient for compensating the distortion characteristic of the amplifier. Backed up storage means, distortion compensation means for performing predistortion processing on the modulated signal using the distortion compensation coefficient stored in the storage means, the time slot includes a burst period and a preamble period placed before the burst period. If it has, a means for inputting low-speed data in the preamble period and communication data in the burst period to the distortion compensating means, comparing the low-speed data with data obtained by demodulating a modulation signal, and calculating a distortion compensation coefficient , A means to determine whether or not it is updated, and to warn if the distortion compensation coefficient is not an appropriate value Radio apparatus characterized by comprising a means for inhibiting the alarm means or the data transmitting forces. 15. A TDMA wireless device for amplifying and transmitting a carrier wave modulated by a digital modulation method by a transmission power amplifier, wherein a non-volatile storage means for pre-storing a distortion compensation coefficient for compensating the distortion characteristic of the amplifier, or Storage means backed up by a battery, predistortion processing is performed on communication data using the distortion compensation coefficient stored in the storage means, and a part of data of a modulation signal to be transmitted and a carrier wave modulated by the data are demodulated. A radio apparatus comprising a calculation / control unit for calculating and updating a distortion compensation coefficient in real time using the obtained demodulated signal. 16. A TDMA type amplifier for amplifying and transmitting a carrier wave modulated by a digital modulation method by a transmission power amplifier, a nonvolatile storage means or a battery for pre-storing a distortion compensation coefficient for compensating the distortion characteristic of the amplifier. The storage means backed up, the distortion compensation coefficient stored in the storage means is used to perform predistortion processing on the modulation signal to be transmitted, and the distortion compensation coefficient is obtained using the demodulated signal obtained by demodulating the carrier wave to be transmitted. And a connection unit for connecting an auxiliary device for inputting a demodulated signal obtained by demodulating a carrier wave to the calculation / control unit, the distortion compensation coefficient being stored in the storage unit. Only when it is stored, the demodulation data is input to the operation / control unit by connecting the accessory means, and the operation / control unit calculates and calculates the distortion compensation coefficient. Characterized in that the calculation / control unit performs predistortion processing on the modulated signal to be transmitted by using the distortion compensation coefficient stored in the storage unit, without using an auxiliary device when the wireless device is actually used. Wireless device. 17. When the distortion compensation coefficient is stored in the storage means, the data transmission speed of the modulation signal is set to a low speed, and the distortion compensation coefficient is calculated by using the demodulated data which is fed back and demodulated by the arithmetic / control section at a low speed. 17. The wireless device according to claim 16, wherein the wireless device is updated in real time and stored in the storage means. 18. In a TDMA wireless device for amplifying and transmitting a carrier wave modulated by a digital modulation method by a transmission power amplifier, a non-volatile storage means for pre-storing a distortion compensation coefficient for compensating for the distortion characteristic of the amplifier, or Battery-backed storage means, when the time slot has a burst period and a preamble period placed before the burst period, means for outputting low-speed data during the preamble period and communication data during the burst period; A predistortion process is performed on the input modulation signal using the stored distortion compensation coefficient, and the distortion compensation coefficient is calculated using the demodulated signal obtained by demodulating the low-speed data and the carrier wave modulated by the low-speed data. A wireless device comprising a calculation / control unit for calculating and updating in real time. 19. A TDMA type amplifier for amplifying and transmitting a carrier wave modulated by a digital modulation method by a transmission power amplifier, wherein a non-volatile storage means or a battery for pre-storing a distortion compensation coefficient for compensating for distortion characteristics of the amplifier. Predistortion processing is performed on the modulated signal to be transmitted using the storage means backed up and the distortion compensation coefficient stored in the storage means, and distortion compensation is performed using the demodulated signal obtained by demodulating the transmitted carrier wave. An arithmetic / control unit for updating the coefficient, and a unit for storing the data and demodulated data transmitted in a predetermined time slot when the wireless device transmits the modulated signal in a plurality of time slots, and the arithmetic / control unit is provided with the predetermined Calculation of distortion compensation coefficient using transmission data and demodulation data in time slots other than time slots Wireless devices and performs update processing. 20. In a TDMA type radio apparatus for amplifying and transmitting a carrier wave modulated by a digital modulation method by a transmission power amplifier, a non-volatile storage means for pre-storing a distortion compensation coefficient for compensating for a distortion characteristic of an amplifier, or Distortion is performed using a battery-backed storage unit, a predistortion process on the modulated signal to be transmitted using the distortion compensation coefficient stored in the storage unit, and a demodulated signal obtained by demodulating the transmitted carrier wave. An arithmetic / control unit that updates the compensation coefficient, and a unit that inserts low-speed data into a predetermined empty time slot when the wireless device transmits modulated signals in a plurality of time slots, and the arithmetic / control unit includes the low-speed data and the low-speed data. The distortion compensation coefficient can be updated in real time using the demodulated signal obtained by demodulating the carrier wave modulated with low-speed data. Wireless device according to claim. 21. A TDMA type amplifier for amplifying and transmitting a carrier wave modulated by a digital modulation method by a transmission power amplifier, a non-volatile storage means or a battery for pre-storing a distortion compensation coefficient for compensating the distortion characteristic of the amplifier. Predistortion processing is performed on the modulated signal to be transmitted using the storage means backed up and the distortion compensation coefficient stored in the storage means, and distortion compensation is performed using the demodulated signal obtained by demodulating the transmitted carrier wave. Distortion compensation means for updating the coefficient, offset measurement means for measuring the offset value of the modulator, offset detection processing for the modulated signal based on the offset value and offset detection means for detecting the convergence of the offset compensation, and data transmission During the preamble period that precedes the burst period Measures the offset value, and the offset compensating means performs the offset compensation process based on the offset value obtained by the measurement. The offset value is measured and the offset compensation process is performed until the offset is compensated. When the offset is compensated in, the distortion compensating means calculates and updates the distortion compensating coefficient from the next own time slot, and stores the updated distortion compensating coefficient in the storage means at the end of communication. . 22. When the offset is not compensated during the preamble period, the distortion compensating means performs predistortion processing on the modulated signal using the distortion compensating coefficient stored in the storage means and inputs the modulated signal to the modulator, and distortion compensating is performed. 22. The wireless device according to claim 21, wherein the coefficient is not updated. 23. A non-volatile storage means for storing a level adjustment value (offset compensation coefficient) for compensating for the offset of the modulator or a storage means backed up by a battery is provided, and the latest offset compensation coefficient is stored in the storage means at the end of communication. 22. The wireless apparatus according to claim 21, wherein the offset compensating means stores the value and starts the offset compensating process in the preamble period with the offset compensating coefficient stored in the storing means as an initial value during communication. 24. In a TDMA type amplifier for amplifying a carrier wave modulated by a digital modulation method by a transmission power amplifier and transmitting the carrier wave, a non-volatile storage means for pre-storing a distortion compensation coefficient for compensating for the distortion characteristic of the amplifier, or Distortion is performed using a battery-backed storage unit, a predistortion process on the modulated signal to be transmitted using the distortion compensation coefficient stored in the storage unit, and a demodulated signal obtained by demodulating the transmitted carrier wave. Distortion compensation means for calculating and updating the compensation coefficient, offset measuring means for measuring the offset value of the detector for demodulating the carrier wave, offset compensation processing for performing the offset compensation processing on the demodulated signal based on the offset value and detecting the convergence of the offset compensation A preamble period that precedes the burst period for transmitting data. The offset measuring unit measures the offset value, the offset compensating unit performs the offset compensating process based on the offset value obtained by the measurement, and the offset is measured and the offset compensating process compensates the offset. When the offset is compensated in the preamble period, the distortion compensating means calculates and updates the distortion compensating coefficient from the next own time slot, and stores the updated distortion compensating coefficient in the storage means at the end of communication. Characterized wireless device. 25. When the offset is not compensated for in the preamble period, the distortion compensating means performs predistortion processing using the distortion compensating coefficient stored in the storage means and inputs it to the modulator, and calculates the distortion compensating coefficient. 25. The wireless device according to claim 24, wherein the wireless device is not updated. 26. A non-volatile storage means for storing a level adjustment value (offset compensation coefficient) for compensating for the offset of the detector or a storage means backed up by a battery is provided, and the latest offset compensation coefficient is stored in the storage means at the end of communication. 25. The radio apparatus according to claim 24, wherein the offset compensating means stores the value and starts the offset compensating process in the preamble period with the offset compensating coefficient stored in the storing means as an initial value during communication. 27. A TDMA type amplifier for amplifying and transmitting a carrier wave modulated by a digital modulation method by a transmission power amplifier, wherein a non-volatile storage means for pre-storing a distortion compensation coefficient for compensating the distortion characteristic of the amplifier, or Distortion is performed using a battery-backed storage unit, a predistortion process on the modulated signal to be transmitted using the distortion compensation coefficient stored in the storage unit, and a demodulated signal obtained by demodulating the transmitted carrier wave. Distortion compensation means for updating the compensation coefficient, offset measurement means for measuring the transmission offset value of the modulator and the reception offset value of the detector for demodulating the modulated signal, and performing offset compensation processing on the transmission data based on the transmission offset value, Performs offset compensation processing on demodulated data based on the reception offset value, and transmits these An offset compensating means for detecting convergence of the offset compensation and the reception offset compensation is provided, and the offset measuring means measures each offset value and the offset compensating means measures in the preamble period placed before the burst period for transmitting the data. Performs offset compensation processing based on each offset value obtained by, performs the above offset value measurement and offset compensation processing until each offset is compensated, and when each offset is compensated in the preamble period, distortion compensation means A radio apparatus which calculates and updates a distortion compensation coefficient from the next own time slot, and stores the updated distortion compensation coefficient at the end of communication in the storage means. 28. When the wireless device transmits data in a plurality of time slots, the offset measuring means measures the offset value and the offset compensating means offsets obtained by the measurement in a predetermined idle time slot period. 28. The radio apparatus according to claim 21, 24, or 27, wherein offset compensation processing is performed based on a value, and the measurement of each offset value and the offset compensation processing are performed until each offset is compensated.