JP2003318747A - Transmission control apparatus and method for radio communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission controller for radio communication apparatus, which optimally automatically adjust its transmission characteristics, irrespective of changes, etc., in its operating environment. <P>SOLUTION: The transmission controller uses initial calibration data 2 stored in a memory means 1 and waveform data 3 for realizing specified transmission characteristics as power control signals, in automatic gain control circuits 10, 12 of a power amplifier 11. At the beginning of transmission, it transmits according to the initial calibration data and compares transmission results from a power detector 12 with the waveform data to feedback and control the initial calibration data. Thus it is possible to always automatically adjust optimally the transmission characteristics of a radio communication apparatus and ensure optimum transmission characteristics at any time with respect to the changes in the temperature, voltages, etc., and the time passage changes, etc., when a user uses it. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to transmission control of a wireless communication device, and more particularly to a transmission control device and method for a wireless communication device such as a portable wireless terminal.

[0002]

2. Description of the Related Art In conventional transmission power control of a radio communication device, power control data is stored in a memory or the like, and the stored data is read out and used as a control signal of an automatic gain control circuit of a power amplifier of a transmission signal. Those adopting are proposed. FIG. 4 is a diagram showing a transmission control device of a conventional wireless communication device. The transmission control device of the wireless communication device inputs a signal to be transmitted and a power amplifier (Po
wer amplifier) 19 and a power detector (Po) that is connected to the output side of the power amplifier 19 and detects the power of the amplified output.
wer detector) 18, a memory 14 for storing power control data 15 for controlling the gain of the power amplifier, a D / A converter 16 for converting the data stored in the memory 14 into analog data, and the power A power amplification controller for controlling the gain of the power amplifier 19 based on the detection output of the detector 18 and the output of the D / A converter 16.
Amplifier Controller) 17 and.

In the conventional transmission control device, the power amplifier 19
The power control data 15 for performing the gain control is read from the memory 14, the power control data 15 is converted into a voltage value by the D / A converter 16, and is input to the power amplification control device 17 as a control signal. The power detector 18 detects a part of the power output from the power amplifier 19 and inputs the power value to the power amplification controller 17. The power amplification controller 17 inputs the value input from the D / A converter 16 and the amplitude value from the power detector 18, calculates the difference between the two, and controls the gain of the power amplifier 19 by the difference.

By the above control, the power amplifier 19 is controlled so that the signal amplitude (power) of its output matches the power control data 15 stored in the memory 14. By properly setting, the characteristics of the transmission signal can be set to an appropriate value. The data written in the memory 14 is set as the same power control data 15 for all portable wireless terminals in the production line.

[0005]

In a wireless communication device such as a portable wireless terminal that is mass-produced, it is time-consuming and equipment-dependent to make adjustments so that optimum electric characteristics can be obtained for each device in the production process. There are restrictions and it is difficult to realize.
The same applies to the transmission control device of the wireless communication device such as the conventional portable wireless terminal shown in FIG. 4, and the data written in the memory 14 is the same data as the adjustment value data regardless of the difference in the characteristics of the individual wireless communication devices. Is. In addition, even if the electrical characteristics change due to changes in temperature or voltage, the data once written to the memory cannot be adjusted by the end user, so there is a change in temperature or voltage during use by the end user. Power control data 1
Since 5 is never rewritten, it is difficult to keep the optimum transmission characteristics. In addition, a method of separately providing a temperature detecting means to cope with such a temperature change (Japanese Patent Laid-Open No. 7-
However, there is a problem in all aspects of device configuration, production, cost, and performance.

(Object) It is an object of the present invention to provide a transmission control apparatus and method for a wireless communication apparatus capable of optimally automatically adjusting the transmission characteristics irrespective of variations in characteristics of equipment and changes in use environment. Especially. Another object of the present invention is to make it possible to adjust the transmission characteristics of each device without increasing the lead time in the production process of a wireless communication device, and to prevent changes in temperature, voltage, etc., aging, etc. Another object of the present invention is to provide a transmission control device and method for a wireless communication device that are automatically adjusted so that optimum transmission characteristics can be ensured at any time.

[0008]

According to the present invention, there is provided a transmission control device for a wireless communication device, wherein the power amplifier is based on a difference between a power detection signal detected from an amplified output of a power amplifier for amplifying a transmission signal and the power control signal. In a transmission control device of a wireless communication device configured to control the gain of the power amplifier, storage means (for example, the memory 1 in FIG. 1) for storing initial control data of the power amplifier and control data for realizing a predetermined transmission characteristic.
And a control data reading means for reading the initial control data to obtain the power control signal (for example, the calibration data reading / correcting section 4 in FIG. 1), and the control data reading means based on the difference between the control data and the power detection signal. Comparing means for controlling the correction of the initial control data (for example, the waveform data reading section 5, the waveform data holding section 7, and the comparing section 6 in FIG. 1).

The transmission controller of the wireless communication device of the present invention is
A transmission control device of a wireless communication device configured to control a gain of the power amplifier based on a difference between a power detection signal detected from an amplified output of a power amplifier for amplifying a transmission signal and a power control signal, Storage means (for example, the memory 1 in FIG. 3) for storing the initial control data and the control data for realizing a predetermined transmission characteristic, and a control data reading means for reading the initial control data to obtain the power control signal (for example, FIG. 3) and a comparing means (for example, the waveform data reading section 5 in FIG. 3) that controls rewriting and correction of the initial control data stored in the storage means based on the difference between the control data and the power detection signal. , A waveform data holding unit 7, and a comparison unit 6).

The transmission signal of each invention is a burst signal, and the initial control data and control data are power-versus-time related data corresponding to an envelope waveform of the burst signal.

The transmission control method of the wireless communication apparatus of the present invention is
In the transmission control method of the wireless communication device, which is configured to control the gain of the power amplifier based on the difference between the power detection signal detected from the amplified output of the power amplifier that amplifies the transmission signal and the power control signal, storage means ( For example, initial control data for calibration of the power amplifier and control data for realizing a predetermined transmission characteristic are stored in the memory 1) of FIG. 1, and the initial control data is read to be the power control signal, and the control data is stored in the memory 1). It is characterized by reading and calculating a difference from the power detection signal and correcting the read initial control data (for example, the waveform data reading unit 5, the waveform data holding unit 7, and the comparing unit 6 in FIG. 1).

The transmission control method of the wireless communication apparatus of the present invention is
In the transmission control method of the wireless communication device, which is configured to control the gain of the power amplifier based on the difference between the power detection signal detected from the amplified output of the power amplifier that amplifies the transmission signal and the power control signal, storage means ( For example, initial control data of the power amplifier and control data for realizing a predetermined transmission characteristic are stored in the memory 1) of FIG. 3, and the initial control data is read and used as the power control signal (for example, calibration data read of FIG. 3). Section 13), calculating a difference between the control data and the power detection signal, and rewriting and correcting the initial control data stored in the storage means (for example, the waveform data reading section 5 and the waveform data holding section in FIG. 3). 7, comparison section 6)
Is characterized by.

The transmission signal of each invention is a burst signal, and the initial control data and control data are power-versus-time related data corresponding to an envelope waveform of the burst signal.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Description of Configuration) FIG. 1 is a diagram showing an embodiment of a transmission control apparatus and method for a wireless communication apparatus according to the present invention. In the present embodiment, as a gain control configuration similar to that of the conventional example shown in FIG. 4, a power amplifier 1 that inputs a transmission signal, amplifies the power, and outputs the power signal.
1 and a power detector 12 which is connected to the output side of the power amplifier 11 and detects the power of the amplified output.
And a D / A converter 8, and the power amplifier 1 based on the output of the power detector 11 and the output of the D / A converter 8.
Power Amplifie Control Device (Power Amplifie)
r Controller) 10 and the following configuration. In other words, the initial calibration data (Calibration data) 2 as the power vs. time relationship data and the spectrum (Spec
memory 1 as memory means for storing waveform data 3 which is power-versus-time related data representing an amplitude (power) characteristic for realizing a predetermined transmission characteristic, such as a transmission signal having the best trum characteristic. A calibration data read / correction unit 4 for reading the initial calibration data 2 from 1 to hold or correct it and outputting it to the D / A conversion unit 8; and a waveform data reading unit 5 for reading and holding the waveform data 3 from the memory 1. An A / D converter 9 for AD converting the detection output of the power detector 12, and a power amplifier 1 for holding the output of the A / D converter 9.
The waveform data holding unit 7 which outputs the actual power vs. time-related data of 1 and the respective outputs of the waveform data reading unit 5 and the waveform data holding unit 7 are output as a difference value, and the calibration data reading and correcting unit 4 And a comparison unit 6 that controls to correct the calibration data.

The function of each part is as follows. Regarding the power amplifier 11, the power detection unit 12, and the power amplification control unit 10, the power amplifier 11 amplifies the power of the modulated wave that is the transmission signal of the wireless communication device, and the power detector 12 outputs one of the power-amplified transmission signals. The power received based on the unit is converted as power-versus-time related data and an analog signal corresponding to the power value is output, and the power amplification control unit 10 outputs the analog signal from the power detector 12 and the D / A conversion unit 8. Each function of comparing the analog signal of the calibration data with each other, calculating and outputting the difference value, and controlling the amplification gain of the power amplifier 11 has a function of performing negative feedback control of the amplification gain as a whole.

The memory 1 stores the power amplifier 11 as initial calibration data 2 for calibration control of the power amplifier 11 of the transmission signal.
Of the power amplifier 11 is calibrated in consideration of various characteristics such as the rising characteristic, and the power-time related data for making the output converge to the output of a predetermined transmission characteristic described later and similarly, as the waveform data 3, the spectrum output of the power amplifier 11. It has a function of previously writing and storing power versus time related data that realizes predetermined transmission characteristics such as output characteristics having good characteristics.

The calibration data read / correction unit 4 reads the initial calibration data 2 in the memory 1 as calibration data for power control of the power amplifier 11 when the radio transmitter is activated, and controls the comparison data by the comparison unit 6. It has a function of correcting and a function of outputting the calibration data or the corrected calibration data to the D / A converter 8.

The waveform data reading unit 5 has a function of reading and holding the waveform data 3 in the memory 1 and outputting it to the comparing unit 5, and the waveform data holding unit 7 outputs from the A / D converting unit 9. It has a function of holding the digital signal of the electric power value from the electric power detector 12 and outputting it to the comparison unit 5.

The comparison unit 6 compares the outputs of the waveform data reading unit 5 and the waveform data holding unit 7, and if they do not match, the difference value between the two outputs is added to or subtracted from the calibration data of the calibration data read / correction unit 4. It has a function of correcting the held calibration data by performing or rewriting the calibration data 4 so as to fill the difference value.

(Description of Operation) The operation of the present embodiment will be described in detail with reference to FIGS. 1 and 2 by taking a transmission signal from a portable radio terminal or the like as an example. Generally, a transmission signal of a mobile wireless terminal is transmitted as a burst signal having a constant amplitude (power). In this case, the memory 1 requests the transmission signal at a time corresponding to the transmission period of the burst signal as the initial calibration data 2 which is the initial value of the calibration data for controlling the gain of the power amplifier 11 in the production process. Waveform data corresponding to the applied power level is written in advance. This waveform data is set, for example, as waveform data having a rising and falling time in consideration of the rising and falling characteristics of the substantially rectangular burst signal of the power amplifier 11 corresponding to the amplification characteristic of the power amplifier 11. It At the same time, in the memory 1, power-time related data having a predetermined transmission characteristic such as the best spectrum output characteristic, for example, waveform data such that the frequency band characteristic of the power amplification output is a burst signal that can be limited to a predetermined range. 3 is written. Specifically, it is waveform data or the like corresponding to the transmission waveform having the rising and falling characteristics of the envelope of the burst signal capable of suppressing the generation of harmonics.

Regarding the power amplification control of the portable wireless terminal which has completed the above setting, it operates as shown in FIG. In the transmission operation after the power supply of the portable wireless terminal is turned on, first, the calibration data read / correction unit 4 reads the initial calibration data 2 from the memory 1.
Is read and held, and the waveform data reading unit 5 reads and holds the waveform data 3 in the memory 1 (s1, s2). D
The / A converter 8 outputs the initial calibration data 2 as a power control signal of an analog signal in synchronization with the envelope waveform of the burst signal input to the power amplifier 11. Power amplifier 1
1 amplifies and outputs (transmits) the burst signal (s
3), at this time, the power amplifier 11 includes the power amplification controller 10
Thus, automatic gain control is performed by the difference between the power control signal and the transmission waveform obtained by detecting the amplified output output from the power detector 12. In the process of amplifying the burst signal of the power amplifier 11, the A / D conversion unit 9 converts the transmission waveform into a digital signal, and the waveform data holding unit 7 amplifies the digital signal into the actual waveform data (power vs. time) of the transmission signal. It is taken in as related data) (s4). The comparison unit 6
The actual waveform data of the waveform data holding unit 7 and the waveform data of the waveform data reading unit 5 are compared (s5), and if they do not match (s6), the initial calibration data of the calibration data reading / correcting unit 4 is filled with the difference. (S7, s2). The operation after the correction of the initial calibration data of the calibration data read / correction unit 4 is similarly performed, and the comparison unit 6 compares the waveform data 3 with the actual waveform data in the unit of transmission of the transmission signal, and the difference between them. And the correction of the data of the calibration data read / correction unit 4 is repeated so as to fill the difference in the non-coincidence.

The above correction operation is performed in such a manner that the actual waveform data held in the waveform data holding unit 7 and the waveform data held in the waveform data reading unit 5 operate in a negative feedback operation in transmission signal units. Therefore, the time-dependent power detection output of the power detector 12, that is, the time-dependent change in the output power of the power amplifier 11 coincides with the time-dependent change in the waveform data 3 stored in the memory 1. This is a negative feedback control operation controlled by.

Therefore, according to the present embodiment, the amplification characteristic of the power amplifier 11 is calibrated by the initial calibration data 2 of the memory 1 at the initial stage of operation, and the waveform data 3 of the memory 1 is repetitively transmitted by the transmitting operation. Controlled to match. That is, by storing ideal data that satisfies a predetermined transmission characteristic as the waveform data 3, it is affected by environmental changes such as temperature changes during use, changes in electrical conditions such as voltage changes, and changes over time. The automatic optimum maintenance of the transmission characteristics including the amplification gain is realized.

(Other Embodiments) The above embodiment is
In this example, the initial calibration data 2 in the memory 1 is read to the calibration data read / correction unit 4 at the start of transmission, and then the calibration data held in the calibration data read / correction unit 4 is corrected by the output of the comparison unit 6. Calibration data read correction unit 4
It is possible to directly rewrite the initial calibration data 2 of the memory 1 and correct it instead of the correction by.

FIG. 3 is a diagram showing this embodiment having such a configuration. The basic configuration of this embodiment is the same as that shown in FIG. 1, except that the calibration data read / correction unit 4 is a calibration data read unit 13 having only a read function, and the comparison unit 6 rewrites the initial calibration data 2 in the memory 1. It is configured to control. In the environment used by the end user, when the transmission characteristic is deteriorated due to, for example, a temperature change or a battery voltage change, the power vs. time related data of the waveform holding unit 7 changes, so Since the data does not match the time-related data, the comparison unit 6 rewrites the initial calibration data 2 in the memory 1 so as to fill the difference between the two power-to-time data. In the case of the present embodiment, since the power amplifier 11 is controlled according to the calibration data 2 that is constantly rewritten via the calibration data reading unit 13, the deterioration of the transmission characteristics is improved as in the embodiment shown in FIG. .

According to the embodiment shown in FIG. 3, the memory 1
Since the initial calibration data 2 is stored as data according to the characteristics of the wireless communication device, it has a feature that it always exhibits optimum transmission characteristics from the initial operation of starting transmission.

As yet another embodiment of the present invention, a wireless communication device for adjusting and confirming transmission characteristics in a production process of a wireless communication device such as a portable wireless terminal by utilizing the principle of the present invention. It is possible to configure a transmission control method. That is, after the above-mentioned predetermined data is recorded in the memory 1 of the wireless communication device of the embodiment shown in FIG. 3, the power is once turned on and the transmission operation is performed in the step of confirming the transmission characteristic, and the output power of the power amplifier 11 is changed. It is possible to automatically adjust the transmission characteristics for each device by a simple method of performing a negative feedback control operation that matches the change in power with time and the change in the waveform data 3 stored in the memory 1 with time. It is possible.

Further, in the above-mentioned embodiments, the embodiment in which the burst signal having the rectangular envelope waveform is assumed as the transmission signal has been described. However, the present invention is not limited to such a transmission signal, and an envelope other than the rectangle is used. The present invention can be applied to various transmission signals according to the type of wireless communication device, such as a transmission signal having a line waveform and a continuous transmission signal.

[0030]

According to the present invention, as the power control signal in the automatic gain adjustment circuit of the power amplifier of the wireless communication device,
The initial control data stored in the storage means and the control data that realizes a predetermined transmission characteristic such as a desired spectrum output characteristic are used. At the start of transmission, transmission is performed by the initial control data, and the transmission result is set to the predetermined transmission characteristic. Since the initial control data is configured to be feedback-controlled as compared with the control data to be realized, the transmission characteristics of the wireless communication device can always be optimally automatically adjusted without using environment detecting means.

For this reason, when the end user uses it, automatic adjustment is performed so that optimum transmission characteristics can be secured at any time even when the environment changes such as temperature changes, changes in electrical conditions such as voltage changes, and changes over time.

Further, in the manufacturing process of the wireless communication device such as the portable wireless terminal, the transmission characteristic can be adjusted for each device without increasing the lead time.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a transmission control device and method of a wireless communication device of the present invention.

FIG. 2 is a diagram showing a processing flow of the present embodiment.

FIG. 3 is a diagram showing another embodiment of the present invention.

FIG. 4 is a diagram showing a conventional example.

[Explanation of symbols]

1 memory 2 Initial calibration data 3 waveform data 4 Calibration data read-out correction section 5 Waveform data reading section 6 comparison section 7 Waveform data storage 8 D / A converter 9 A / D converter 10 Power amplification controller 11 power amplifier 12 Power detector 13 Calibration data reading section

Claims (6)

[Claims] 1. A transmission control device for a wireless communication device configured to control the gain of the power amplifier based on a difference between a power detection signal detected from an amplified output of a power amplifier for amplifying a transmission signal and a power control signal. In, storage means for storing initial control data of the power amplifier and control data for realizing a predetermined transmission characteristic; control data reading means for reading the initial control data to obtain the power control signal; and the control data. And a comparison unit that controls the modification of the initial control data of the control data reading unit according to the difference from the power detection signal. 2. A transmission control device for a wireless communication device configured to control a gain of the power amplifier based on a difference between a power detection signal detected from an amplified output of a power amplifier for amplifying a transmission signal and a power control signal. In, storage means for storing initial control data of the power amplifier and control data for realizing a predetermined transmission characteristic; control data reading means for reading the initial control data to obtain the power control signal; and the control data. And a comparison unit that controls rewriting and correction of the initial control data stored in the storage unit according to a difference from the power detection signal. 3. The transmission signal is a burst signal, and the initial control data and the control data are power-versus-time related data corresponding to an envelope waveform of the burst signal. A transmission control device of the wireless communication device described. 4. A transmission control method for a wireless communication device configured to control the gain of the power amplifier based on the difference between the power detection signal detected from the amplified output of the power amplifier for amplifying the transmission signal and the power control signal. In the storage means, storing initial control data for calibration of the power amplifier and control data for realizing a predetermined transmission characteristic, reading the initial control data as the power control signal, and reading the control data A transmission control method for a wireless communication device, characterized by calculating a difference from a power detection signal and correcting the read initial control data. 5. A transmission control method for a wireless communication device configured to control the gain of the power amplifier based on a difference between a power detection signal detected from an amplified output of a power amplifier for amplifying a transmission signal and a power control signal. In the storage means, initial control data of the power amplifier and control data for realizing a predetermined transmission characteristic are stored, and the initial control data is read to be the power control signal, and the control data and the power detection signal A transmission control method for a wireless communication apparatus, which calculates a difference and rewrites and corrects the initial control data stored in the storage means. 6. The transmission signal is a burst signal, and the initial control data and control data are power versus time related data corresponding to an envelope waveform of the burst signal. A method for controlling transmission of a wireless communication device as described.