JP2001028551A - Radio unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform setting the operation conditions of a baseband unit side, regardless of a radio unit that incorporates the same. SOLUTION: A correction information memory 46e stores a temperature coefficient, voltage coefficient, channel coefficient and control voltage-to-output change coefficient for gain control signal correction, and temperature coefficient, voltage coefficient and channel coefficient for RSSI signal correction which gas generated on the basis of measurement information obtained by using a self-unit. A transmission output adjusting part 46a corrects the level of a gain control signal and an RSSI correcting part 46b, and also corrects the level of an RSSI signal respectively, on the basis of an ambient temperature detected by a temperature sensor 28, a feeding power voltage detected by a voltage sensor 27, the currently used channel and each coefficient stored in the memory 46e.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a PHS (Pe
The present invention relates to a wireless unit that is applied to a terminal such as a rsonal handyphone system and performs processing such as converting a baseband signal to a radio frequency signal for wireless transmission, and converting a radio frequency signal to a baseband signal.

[0002]

2. Description of the Related Art A radio unit and a baseband unit are known as main units constituting a PHS terminal.

FIG. 4 is a diagram showing a main part configuration of a conventional radio unit used for a PHS terminal.

As shown in FIG. 1, a conventional radio unit includes an I / Q modulator 1, a low-pass filter 2, a gain control amplifier 3, a mixer 4, a buffer 5, a band-pass filter 6, a driver 7, a power amplifier 8, an antenna Switch 9, inverter 10, band-pass filter 11, antenna 12, low-noise amplifier 13, mixer 14, buffer 1
5, band pass filter 16, mixer 17, band pass filter 18, intermediate frequency amplifier 19, RSSI detector 2
0, PLL unit 21, crystal oscillator 22, first voltage controlled oscillator 23, second voltage controlled oscillator 24, regulators 25 and 26, voltage sensor 27, temperature sensor 28, and power switches 29, 30, 31, 32, 33, 34,35
have.

The conventional wireless unit operates by being connected to a baseband unit. However, as shown in FIG. 4, only an analog system is mounted on the wireless unit, and a digital system such as a control unit is not provided. It is common sense to mount it on a baseband unit.

[0006] For this reason, I / O for providing a received signal down-converted to the intermediate frequency band to the baseband unit is performed.
In addition to an F output terminal and an IF input terminal for taking in transmission signals (I, Q) of the intermediate frequency band from the baseband unit, an RX power supply SW terminal, an RSSI output terminal, a VCO
Power supply SW terminal, L DET output terminal, DATA input terminal, CK input terminal, STB input terminal, BS input terminal, A
NT SW terminal, SYSCK output terminal, two PA S
W terminal, TX BS terminal, two IF input terminals, PC
There are provided connection terminals such as an ONT input terminal, a 3.6 V power supply terminal, a REG control input terminal, a BATT output terminal, and a TEMP output terminal for transmitting and receiving various signals and information to and from the baseband unit.

[0007] Further, a case is provided in which several attenuators are provided for attenuating a received signal when the reception level is too high, and the attenuator is operated when a strong input state is detected by the strong input detection unit. However, in this case, a terminal for outputting the detection signal of the strong input detection unit to the baseband unit and some input terminals for controlling the operation of the attenuator are provided.

[0008] As described above, the conventional wireless unit needs to transmit and receive a large number of signals and information to and from the baseband unit, and thus has problems such as a complicated interface and a large connector. .

The RSI generated by the RSSI detector 20 is
The SSI signal is provided to the baseband unit via the RSSI output terminal, and is used for determining the reception level at the baseband unit.

However, the characteristics of the RSSI signal generated by the RSSI detection unit 20 are such that the deviation between channels, the deviation due to a temperature change, or the deviation due to a change in a power supply voltage varies from radio unit to radio unit. Is corrected.

On the other hand, the gain control amplifier 3 is for adjusting the level of the transmission output, and the gain is controlled by the P CONT signal supplied from the baseband unit via the P CONT input terminal.

However, the characteristics of the gain control amplifier 3 are such that a deviation between channels, a deviation due to a temperature change, or a deviation due to a change in power supply voltage varies for each wireless unit.
The P CONT signal is corrected in the baseband unit.

More specifically, the baseband unit includes:
The average characteristic of the wireless unit is previously provided as a representative value. When actually assembled with the wireless unit,
An error between the characteristic of the wireless unit and a representative value stored in advance is obtained, and correction information is created based on the error. At the time of operation, RSSI signal correction and P
The CONT signal is corrected.

Since the setting of the correction information in the baseband unit must be performed after forming a pair with the wireless unit, a user who wants to construct a system by assembling the wireless unit and the baseband unit is required. The work had to be done and it was very troublesome.

In addition, if the pair breaks down after replacing one of them after assembling, the operation of setting the conditions for correction in the baseband unit must be performed again, and the maintenance work is very troublesome. Had become.

The operation timing of each part of the wireless unit is also controlled from the baseband unit. The optimal control timing for sufficiently exhibiting the wireless performance is determined by fully understanding the characteristics of the wireless unit. It is necessary to appropriately set the control timing in the baseband unit, which is very troublesome.

[0017]

As described above, the conventional radio unit gives various signals necessary for control to the baseband unit and operates under the control of the baseband unit. Therefore, the setting of the operating condition of the baseband unit cannot be performed unless the pair with the wireless unit is determined.

In addition, the conventional wireless unit has to transmit and receive a large number of signals to and from the baseband unit, so that there is a problem that the interface becomes complicated.

The present invention has been made in view of such circumstances. The first object of the present invention is to set the operation conditions of the baseband unit irrespective of the wireless unit to be assembled. It is to provide a wireless unit that enables it.

The second object of the present invention is to
Decrease the signal exchanged with the baseband unit,
An object of the present invention is to provide a wireless unit capable of simplifying an interface.

[0021]

In order to achieve the first object, the first invention is used by being connected to a baseband unit, and converts a baseband signal given from the baseband unit into a radio frequency signal. A wireless unit that converts the signal into a signal and wirelessly transmits the signal; a temperature detecting unit such as a temperature sensor for detecting an ambient temperature; a voltage detecting unit such as a voltage sensor for detecting a voltage of externally supplied power; Amplifying means such as a gain control amplifier for amplifying a signal with a gain according to the level of the control voltage, and a temperature coefficient indicating the amount of change in the transmission output with respect to a unit change in the ambient temperature, obtained by using the own unit. And a temperature coefficient storage means such as a correction information memory for storing the unit voltage. A voltage coefficient storage means such as a correction information memory for storing a voltage coefficient indicating a change amount of the transmission output, and a channel coefficient indicating the change amount of the transmission output with respect to a unit channel change obtained using the own unit. Channel coefficient storage means, such as a correction information memory, for example, and a control voltage vs. output coefficient, which is obtained by using its own unit, and stores a control voltage vs. output coefficient indicating a change amount of a transmission output with respect to a unit change of the control voltage. A control voltage versus output coefficient storage means such as an information memory, and a deviation of a transmission output due to a change in ambient temperature based on the ambient temperature detected by the temperature detection means and the temperature coefficient stored in the temperature coefficient storage means. Changing the voltage of the supply power based on the voltage detected by the voltage detection means and the voltage coefficient stored in the voltage coefficient storage means. The deviation of the transmission output due to the above, the deviation of the transmission output according to the channel used for transmission based on the channel used for transmitting the radio frequency signal and the channel coefficient stored in the channel coefficient storage means, furthermore, Based on the transmission output and the control voltage versus output coefficient stored in the control voltage versus output coefficient storage means, the deviation of the transmission output according to the level of the control voltage is compensated for so that the transmission output becomes a desired level. And a transmission output deviation compensating means such as a transmission output adjusting section for determining a control voltage to be applied to the amplifying means.

By taking such a measure, a deviation of the transmission output within the wireless unit is compensated according to the actual characteristics of the wireless unit. Therefore, the characteristics of the wireless unit do not affect the baseband unit, and there is no need to consider the characteristics of the wireless unit on the baseband unit side.

In order to achieve the first object, the second
The present invention is used by being connected to a baseband unit, and detects an ambient temperature in a wireless unit which converts a radio frequency signal arriving via a wireless line into a baseband signal and gives the baseband signal to the baseband unit. For example, a temperature detection unit such as a temperature sensor, a voltage detection unit such as a voltage sensor for detecting a voltage of externally supplied power, and a reception level signal having a level corresponding to the reception level of the radio frequency signal are generated. A reception level signal generating means such as an RSSI detector, and a correction coefficient memory which stores a temperature coefficient obtained by using its own unit and indicating a level change amount of the reception level signal with respect to a unit change of the ambient temperature. Temperature coefficient storage means of the supply voltage obtained by using its own unit, A voltage coefficient storage means such as a correction information memory for storing a voltage coefficient indicating a level change amount of the signal level signal, and a change in the level of the reception level signal with respect to a unit channel change obtained by using its own unit. A channel coefficient storage means such as a correction information memory storing a channel coefficient indicating the amount, and an ambient temperature based on the ambient temperature detected by the temperature detection means and the temperature coefficient stored in the temperature coefficient storage means. The deviation of the level of the reception level signal due to the change is determined based on the voltage detected by the voltage detection unit and the voltage coefficient stored in the voltage coefficient storage unit. The deviation of the signal level is further stored in the channel used for transmitting the radio frequency signal and the channel coefficient storage means. A deviation of the level of the reception level signal corresponding to the channel used for transmission is compensated based on the stored channel coefficient so that the level of the reception level signal has a predetermined relationship with the level of the reception signal. And a receiving level signal correcting unit such as an RSSI correcting unit for correcting the receiving level signal.

By taking such measures, the deviation of the reception level signal in the radio unit is compensated according to the actual characteristics of the radio unit. Therefore, the baseband unit can acquire a reception level signal having almost no deviation, and there is no need to compensate the reception level signal in consideration of the characteristics of the wireless unit.

According to a third aspect of the present invention, in addition to the second aspect of the invention, there is provided an attenuating means comprising, for example, three attenuators for attenuating the radio frequency signal, and a strong input for detecting a predetermined strong input state. A strong input detection unit such as a detection unit, and attenuating the radio frequency signal by the attenuation unit when the strong input state is detected by the strong input detection unit, for example, a main control unit and a timing control unit. Attenuating control means, and the receiving level signal correcting means corrects the receiving level signal in consideration of the amount of attenuation by the attenuating means.

By adopting such means, even if the level of the received signal is reduced by the attenuation by the attenuating means, the reception level indicating the correct received signal level before being attenuated in this way. A signal is output.

In order to achieve the second object, the fourth
The present invention is used by being connected to a baseband unit, a function of converting a baseband signal given from the baseband unit into a radio frequency signal and transmitting the radio frequency signal, and a radio frequency signal arriving via a radio line. In a wireless unit having at least one of the functions of converting a power supply to a baseband signal and providing the baseband signal to the baseband unit, for example, timing for performing power control of at least a part of a constituent circuit to perform power control for battery saving Power control means such as a control unit was provided.

By adopting such means, power supply control from the baseband unit is not required for the constituent circuits whose power supply is controlled by the power supply control means, and the number of power control objects from the baseband unit is reduced.

According to a fifth aspect of the present invention, the power supply control means in the fourth aspect of the present invention controls all the power supplies of the constituent circuits for performing the power control for battery saving.

By taking such measures, power control from the baseband unit is not required at all.

In order to achieve the second object, the sixth
The invention of the present invention is used by being connected to a baseband unit. In a wireless unit that converts a radio frequency signal arriving via a radio line into a baseband signal and provides the baseband unit with the radiofrequency signal, Attenuating means for attenuating, for example, three attenuators, strong input detecting means such as a strong input detecting unit for detecting a predetermined strong input state, and the strong input state being detected by the strong input detecting means. An attenuating control unit including, for example, a main control unit and a timing control unit for attenuating the radio frequency signal by the attenuating unit when detected.

By taking such means, the radio frequency signal attenuation processing for coping with a strong input is performed in a closed loop in the radio unit, and there is no need to receive control from the baseband unit. .

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a main configuration of a wireless unit according to the present embodiment. The same parts as those in FIG. 4 are denoted by the same reference numerals.

In this figure, the unit denoted by reference numeral 100 is the wireless unit of the present embodiment, and the I / Q
Modulation section 1, gain control amplifier 3, mixer 4, band pass filter 6, driver 7, power amplifier 8, antenna switch 9, band pass filter 11, low noise amplifier 1
3, mixer 14, bandpass filter 16, mixer 1
7, band pass filter 18, intermediate frequency amplifier 19, R
SSI detector 20, PLL unit 21, quartz oscillator 2
2. First voltage controlled oscillator (hereinafter referred to as first VCO)
23, a second voltage controlled oscillator (hereinafter referred to as a second VCO) 24, regulators 25 and 26, a voltage sensor 27,
Temperature sensor 28, D / A converter 31, antenna terminal 3
2, attenuators 33, 34, 35, strong input detector 3
6, A / D converters 37 and 38, low-pass filter 39,
40, switch unit 41, A / D converters 42, 4
3, an interface unit 44, a D / A converter 45, and a control unit 46.

The transmission signal of the intermediate frequency band given from a baseband unit (not shown) is input to the I / Q modulation section 1 for each of the I system and the Q system.
Modulation is performed using the second local oscillation signal provided to the Q modulation section 1.

The modulated transmission signal is amplified by the gain control amplifier 3 at an arbitrary gain for transmission level adjustment.
First local oscillator signal output from first VCO 23 and mixer 4
Is up-converted into a radio frequency band by being combined. The gain of the gain control amplifier 3 is controlled by the control unit 4
6 is controlled by a gain control signal provided via a D / A converter 31.

The transmission signal in the radio frequency band is subjected to removal of unnecessary frequency components by the band pass filter 6 and then amplified by the driver 7 and the power amplifier 8 to a level at which radio transmission is possible.

Thereafter, the transmission signal is supplied to the antenna 12 connected to the antenna terminal 32 via the antenna switch 9 and the band-pass filter 11, and is transmitted by radio.

On the other hand, the received signal converted from the arriving radio wave by the antenna 12 is provided to the low noise amplifier 13 via the band pass filter 11 and the antenna switch 9. The received signal is amplified by the low-noise amplifier 13, but when the received level is high, the level is adjusted by attenuating the level appropriately by the attenuators 33, 34, and 35.

The received signal whose level has been adjusted in this way is mixed with the first local signal output from the first VCO 23 and the mixer 14, and further with the second local signal output from the second VCO 24 and the mixer 17. Are down-converted into an intermediate frequency band by being combined. Each time the received signal is combined with the local oscillation signal, unnecessary components are removed by the band-pass filters 16 and 18.

The down-converted received signal is amplified by the intermediate frequency amplifier 19 and then output from the IF output terminal to the baseband unit.

The received signal output from the mixer 14 is also input to the strong input detector 36. Strong input detector 36
Monitors the level of the received signal output from the mixer 14 and outputs a strong input detection signal indicating whether or not a predetermined strong input state is established. This strong input detection unit 36
Are output by the A / D converter 37, and then supplied to the control unit 46.

The R connected to the intermediate frequency amplifier 19
In the SSI detection unit 20, the input level of reception (RSSI)
Generates and outputs a DC voltage proportional to
And outputs an RSSI signal whose level changes in accordance with the change in. The RSSI signal is digitized by the A / D converter 38 and then supplied to the control unit 46.

The PLL unit 21 includes a first PLL 21
a, a second PLL 21b, a crystal oscillator 21c, and a buffer 21d.

The first PLL 21a feeds back the output of the first VCO 23 via the low-pass filter 39,
The first VCO 23 so that the first local oscillation signal has a predetermined output.
Control the transmission frequency of the

The second PLL 21b feeds back the output of the second VCO 24 via the low-pass filter 40,
The second VCO 24 so that the second local oscillation signal has a predetermined output.
Control the transmission frequency of the

The crystal oscillator 21c generates a system clock of a predetermined frequency from the reference signal output from the crystal oscillator 22, and outputs this system clock from the SYS CK output terminal to the baseband unit via the buffer 21d.

The PLL unit 21 is at the high level when the phase comparisons by the phase comparators match, and is in a pulsed state at other times.
Output ET.

The regulators 25 and 26 are supplied with 3.6V power from the baseband unit via a 3.6V power supply terminal, and generate 3V and 2.8V power. The power generated by the regulators 25 and 26 is supplied to the following units via the switch unit 41.

A. Low noise amplifier 13 and mixer 14 b. Mixer 17 c. Intermediate frequency amplifier 19 and RSSI detector 20 d. First VCO 23 e. Crystal oscillator 21c f. Second VCO 24 g, h. Antenna switch 9 i. Power amplifier 8 j. Driver 7 k. Mixer 4 l. Gain control amplifier 3 m. I / Q modulator 1 n. First PLL 21a o. Second PLL 21b p. Attenuator 33 q. Attenuator 34 r. Attenuator 35 s. The strong input detection unit 36 The switch unit 41 can individually turn on / off the above outputs a to s, and turns them on / off under the control of the control unit 46.

The voltage sensor 27 outputs a voltage detection signal of a level corresponding to the voltage of the electric power supplied from the baseband unit via the 3.6 V power supply terminal. The voltage detection signal is digitized by the A / D converter 42 and then supplied to the control unit 46.

The temperature sensor 28 outputs a temperature detection signal at a level corresponding to the ambient temperature. This temperature detection signal is A
After being digitized by the / D converter 43, it is supplied to the control unit 46.

The interface unit 44 converts a measurement signal output from a measuring device 200 connected at the time of a correction condition setting operation described later into a form that can be taken in by the control unit 46 and provides the converted signal to the control unit 46. The measuring device 20
Numeral 0 is connected to the antenna terminal 32 at the time of setting the correction conditions, and performs level measurement of a transmission signal and output of a reception signal for a test.

The D / A converter 45 converts the digital RSSI signal supplied from the control unit 46 into an analog signal, and outputs the analog signal to the baseband unit via an RSSI output terminal.

As shown in FIG. 2, the control unit 46 includes a transmission output adjustment unit 46a, an RSSI correction unit 46b,
It has an SSI output unit 46c, a correction information management unit 46d, a correction information memory 46e, a timing control unit 46f, a timing information memory 46g, and a main control unit 46h.

The transmission output adjusting section 46a is provided with a main control section 46h.
Is corrected in consideration of the correction information provided from the correction information management unit 46d.
Then, the transmission output adjusting section 46 a supplies the corrected gain control signal to the gain control amplifier 3 via the D / A converter 31.

The RSSI correction section 46 b receives the RSSI signal output from the RSSI detection section 20 and digitized by the A / D converter 38. The RSSI correction unit 46b is provided with correction information from the correction information management unit 46d, and corrects the RSSI signal based on the correction information. Then, the RSSI correction unit 46b supplies the corrected RSSI signal to the RSSI output unit 46c.

The RSSI output section 46c outputs the RSSI signal supplied from the RSSI correction section 46b to the D / A converter 4
5 to a baseband unit (not shown).

When the correction condition is set to the correction information management section 46d, the voltage detection signal from the A / D converter 42 is
The temperature detection signal from the A / D converter 43, the measured value from the measuring device 200 from the interface unit 44, the uncorrected RSSI signal from the RSSI correction unit 46b, the channel (CH) designation information, the attenuator from the main control unit 46h. Information and RF input level information are each provided. Then, in the correction condition setting state, the correction information management unit 46d generates the correction information for generating the gain control signal and the correction information for the RSSI signal based on the input information, and stores them in the correction information memory 46e.

In the normal operation state of the correction information management section 46d, the voltage detection signal from the A / D converter 42, the temperature detection signal from the A / D converter 43, and the main control section 4d.
From 6h, channel (CH) designation information and attenuator information are provided. In the normal operation state, the correction information management unit 46d fetches the correction information for generating the gain control signal and the correction information for the RSSI signal in the current operation state from the correction information memory 46e based on the input information, and The correction information for signal generation is provided to the transmission output adjustment unit 46a, and the correction information for the RSSI signal is provided to the RSSI correction unit 46b.

The timing control section 46f controls the operation timing of each section by controlling the switch unit 41 based on the timing information registered in advance in the timing information memory 46g.

The main control unit 46h receives transmission control (Tx) and reception control (R
x), control information of channel control (CH), standby control and slot control are given. The main control unit 46h
Includes a transmission output adjustment unit 46a in the control unit 46,
The PLL unit 21 and the A / D converter 37 are connected in addition to the SSI correction unit 46b, the correction information management unit 46d, and the timing control unit 46f.

The main control unit 46h refers to various types of input information, and controls the transmission output adjustment unit 46a, the RSSI correction unit 46b, the correction information management unit 46d, and the timing control unit 46.
and the operation of the PLL unit 21.

Next, the operation of the wireless unit 100 configured as described above will be described. Note that the basic operation related to transmission and reception is the same as that of a conventional wireless unit, and a description thereof will be omitted. Here, description will be made focusing on some characteristic operations of the present invention.

[Correction of Gain Control Signal and RSSI Signal] First, correction conditions are set at the time of manufacturing the wireless unit 100 or the like.

In this correction condition setting, the measuring device 200 is connected to the antenna terminal 32 and the interface section 44 as shown in FIG. 1, and the control unit 46 is set to the correction condition setting state. The ambient temperature is set to a predetermined reference temperature (for example, 25 ° C.).

Further, the baseband unit is set to the transmission state, and the I and Q inputs (I, Q) given from the baseband unit are modulated by the I / Q modulation section 1 to obtain the IF band. Output.

Then, the output level from the antenna terminal 32 at this time is measured by the measuring device 200, and the measurement result is sent to the correction information management unit 46 via the interface unit 44.
Take in d.

The correction information management unit 46d confirms the measurement result, determines whether the transmission output is larger than a predetermined target value, and instructs the transmission output adjustment unit 46a to perform gain control. Then, the transmission output adjusting unit 46a sends a gain control signal according to the instruction to the gain control amplifier 3 via the D / A converter 31, and controls the gain of the gain control amplifier 3.

The correction information management unit 46d sets the digital value output by the transmission output adjustment unit 46a to the D / A converter 31 when a certain transmission output is achieved, that is, the gain control signal level as the initial adjustment value A. It is stored in the correction information memory 46e.

The acquisition of the initial adjustment value A is performed in a state where the transmission channels are set to the L channel and the H channel on both sides and the M channel of the center, respectively. The initial adjustment values for each of the L channel, the M channel, and the H channel are denoted by A1, A2, and A, respectively.
3 is assumed.

In addition, data necessary for correcting the gain control signal include a temperature coefficient, a voltage coefficient, a channel coefficient, and a control voltage versus output change coefficient.

The correction information management unit 46d determines whether the gain control signal level at which the transmission output is at a predetermined level is equal to or smaller than the predetermined value T1 when the ambient temperature is equal to the predetermined value T1.
2 is measured, and the level difference is divided by the temperature difference (T2−T1) to obtain a temperature coefficient α [dB / ° C.].
And stores the temperature coefficient α in the correction information memory 46e.

When the supply voltage from the baseband unit is a predetermined value V1 and the supply voltage is a predetermined value V2 larger than V1, the correction information management unit 46d sets the gain control signal level at which the transmission output becomes a predetermined level. The difference from the time is measured, and the level difference is divided by (V2−V1) to obtain a voltage coefficient β [dB / V], and the voltage coefficient β is stored in the correction information memory 46e.

The correction information management section 46d measures the difference between the gain control signal level at which the transmission output is at a predetermined level between the L channel and the M channel, and determines this level difference as the L level.
-A channel coefficient γ1 [dB / channel] is obtained by dividing by the number of channels between the M channels. Further, the correction information management unit 46d measures the difference between the M channel and the H channel of the gain control signal level at which the transmission output becomes a predetermined level, and determines the level difference by the number of channels between the MH channels. By dividing, the channel coefficient γ2 [dB / channel]
Ask for. Then, the correction information management unit 46d stores the channel coefficients γ1 and γ2 in the correction information memory 46e.

Further, the correction information management unit 46d calculates the difference between the transmission output level when the gain control signal level is set to the predetermined level C1 and the transmission output level when the gain control signal level is set to the predetermined level C2 larger than C1. Is measured and the level difference is divided by (C2−C1) to obtain a control voltage versus output change coefficient B [dB / V], and the control voltage versus output change coefficient B is stored in the correction information memory 46e.

In the calculation of any of the above-mentioned various coefficients, the undefined one of the ambient temperature, the supply voltage and the used channel is fixed to a predetermined state.

On the other hand, when the test signal is output from the measuring device 200 at a predetermined level, the RSSI signal generated by the RSSI detector 20 is corrected by the RSSI corrector 46b without performing correction. It leads to the management unit 46d.

Data necessary for correcting the RSSI signal includes a temperature coefficient, a voltage coefficient and a channel coefficient.

The correction information management section 46d calculates the RSSI signal and the ambient temperature when the ambient temperature is the predetermined value T1.
A difference from the RSSI signal at a predetermined value T2 larger than 1 is measured, and the difference is divided by (T2−T1) to obtain a temperature coefficient δ [bit / ° C.]. To store.

The correction information management section 46d provides an RSSI signal when the supply voltage from the baseband unit is a predetermined value V1 and a predetermined value V2 which is larger than V1.
Measure the level difference from the RSSI signal when
The voltage coefficient ε [bit / V] is obtained by dividing this level difference by (V2−V1), and this voltage coefficient ε is stored in the correction information memory 46e.

The correction information management section 46d measures the level difference between the RSSI signal on the L channel and the RSSI signal on the M channel, and divides this level difference by the number of channels between the LM channels to obtain the channel coefficient ζ1. Ask. Further, the correction information management unit 46d measures the level difference between the RSSI signal in the M channel and the RSSI signal in the H channel, and divides the level difference by the number of channels between the M and H channels to obtain a channel coefficient ζ2.
Then, the correction information management unit 46d calculates the channel coefficients {1,
2 is stored in the correction information memory 46e.

As described above, the correction information for the gain control signal and the RSSI signal is generated and stored in the correction information memory 46e.

In the calculation of any of the above-mentioned various coefficients, the undefined one of the ambient temperature, the supply voltage and the used channel is fixed to a predetermined state.

Using the correction information thus generated, the gain control signal and the RSSI signal are corrected as follows.

In the state where the gain control signal and the RSSI signal are corrected, that is, in the actual operation state, the correction information management unit 4
6d are initial adjustment values A1, A from the correction information memory 46e.
2, A3, temperature coefficient α, voltage coefficient β, channel coefficient γ
1, γ2 and control voltage versus output change coefficient B,
These correction information are provided to the transmission output adjustment unit 46a. The correction information management unit 46d includes a correction information memory 46.
From e, temperature coefficient δ, voltage coefficient ε and channel coefficient ζ
1 and ζ2 are taken out, and these pieces of correction information are given to the RSSI correction unit 46b.

Further, the correction information management section 46 d determines the current power supply voltage based on the voltage detection signal provided from the A / D converter 42 and the current power supply voltage based on the temperature detection signal provided from the A / D converter 43. Based on the channel information provided from the main control unit 46h, the current channel to be used is determined, and these are notified to the transmission output adjustment unit 46a and the RSSI correction unit 46b. Further, the correction information management unit 46d determines the current amount of received signal attenuation based on the attenuator information provided from the main control unit 46h, and notifies the RSSI correction unit 46b of this.

The transmission output adjusting section 46a receives the information and determines the level of the gain control signal supplied from the main control section 46h to determine the channel-to-channel deviation, temperature deviation and voltage deviation of the transmission power caused by the characteristics of its own unit. Correct as appropriate to compensate.

Further, the RSSI correction unit 46b receives the information, and converts the level of the RSSI signal supplied from the RSSI detection unit 20 via the A / D converter 38 into an RSSI inter-channel deviation caused by the characteristics of its own unit. Correct appropriately so as to compensate for temperature deviation and voltage deviation.

As described above, according to the present embodiment, the level of the gain control signal is corrected according to the actual characteristics of the own unit, and the transmission output level can always be appropriately adjusted to the target value. Therefore, the baseband unit only needs to specify the target value of the transmission output level without considering the characteristics of the wireless unit 100 at all.

Further, according to the present embodiment, the RSSI signal is output after its level has been corrected in accordance with the actual characteristics of its own unit so that the relation with the reception input level becomes a normal state. Therefore, the baseband unit can easily and accurately determine the reception input level from the level of the RSSI signal output from the wireless unit 100.

Further, in the present embodiment, since the attenuation of the received signal by the attenuators 33, 34, 35 is taken into account in the correction of the RSSI signal, these attenuators 33, 3
It is possible to generate an RSSI signal indicating the correct reception input level before being attenuated at 4, 35. When determining the reception input level on the baseband unit side, only the RSSI signal level is used. Attention should be paid.

Conventionally, under the hypothesis that the characteristics of each wireless unit show the same characteristic curve and the shift also moves in parallel, the average characteristic of many wireless units is given to the baseband unit as a representative value. In advance, the gain control voltage and the RSSI level are corrected in consideration of the error between the representative value and the actual wireless unit characteristics.

For this reason, conventionally, correction has not always been accurately performed due to an error between the characteristic curve of the representative value and the actual characteristic curve of the wireless unit 100, and the occurrence of deviation.

However, according to the present embodiment, the correction is performed based on the correction information generated based on the characteristics of each wireless unit 100 and the signal actually obtained by the wireless unit 100 without using the representative value. Therefore, accurate correction can be performed as compared with the related art.

By the way, the control voltage versus output characteristic of the power amplifier 8 is not linear, but generally changes individually. In addition, since the power amplifier 8 generally has very close characteristics in order to reduce current consumption, the variation in linearity is large.

However, in the conventional correction method, since such individual characteristics of the power amplifier 8 cannot be considered,
The influence of the variation in linearity was reduced by reducing the maximum width of the correction so as not to apply much correction.

In the present embodiment, the transmission output level is appropriately adjusted based on the individual control voltage versus output change coefficient B of the wireless unit 100, so that the correction width can be increased, and the maximum value of the transmission output level can be reduced. It is possible to make it larger.

[Power Control] The timing control unit 46f
For battery saving, power is supplied at the timing shown in FIG. 3, for example, based on an instruction from the main control unit 46h (such as a lock notification of the PLL unit 21) and the timing information stored in the timing information memory 46g. Thus, the regulators 25 and 26 and the switch unit 41 are controlled.

As described above, according to the present embodiment, since the power supply of each unit in the wireless unit 100 is controlled in the wireless unit 100, it is not necessary to take in many signals for power control from the baseband unit. Therefore, it is possible to reduce the number of signal lines to and from the baseband unit.

Further, since the power control is performed in the radio unit 100, there is no need to supply the lock detection signal L DET to the baseband unit. Therefore, it is possible to further reduce the number of signal lines to and from the baseband unit.

Further, since it is not necessary to control the power supply of the radio unit 100 with the baseband unit, it is troublesome for the user to fully understand the characteristics of the radio unit 100 and appropriately set the control timing of the baseband unit. Work is not required.

[Process at Strong Input] The main control unit 46h periodically checks a strong input detection signal supplied from the strong input detection unit 36 via the A / D converter 37.

When the strong input detection signal indicates the strong input state, the main control unit 46h instructs the timing control unit 46f to appropriately operate the attenuators 33, 34, 35 according to the state of the strong input.

In response to this instruction, the timing controller 46f
Operates the designated attenuator to attenuate the received signal.

As described above, according to the present embodiment, since the attenuator control at the time of the strong input is performed by the closed loop in the wireless unit 100, the strong input detection signal and the attenuator 3 are controlled.
There is no need to send and receive 3, 34, 35 control signals to and from the baseband unit. Therefore, it is possible to reduce the number of signal lines to and from the baseband unit.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the transmission control (T
x), each control information of reception control (Rx), channel control (CH), standby control and slot control is transmitted by an individual signal line, but if it is transmitted through a common serial interface, , The number of signal lines can be further reduced.

In this case, furthermore, the IF input is also transmitted through the serial interface in a digitized state, and the I and Q components are converted to analog signals before being led to the I / Q modulation section 1. You can do so. With such a configuration, the number of signal lines can be further reduced. In addition, since the measurement including the variation of the I and Q outputs can be performed when the correction information of the gain control signal is created, the gain control signal can be determined so as to compensate for the variation of the I and Q outputs. Eliminates the need for the user to do this.

In the above embodiment, the wireless unit 10
Although the power control of each unit in the unit 0 is entirely performed in the wireless unit 100, the power control for some of the constituent circuits may be performed from the baseband unit side. However, performing all the operations in the wireless unit 100 has the greatest effect of reducing the number of signal lines.

In addition, various modifications can be made without departing from the gist of the present invention.

[0112]

According to the first aspect of the present invention, there is provided a wireless unit which is used by being connected to a baseband unit and converts a baseband signal provided from the baseband unit into a radio frequency signal and wirelessly transmits the radio frequency signal. Temperature detection means for detecting the ambient temperature, voltage detection means for detecting the voltage of externally supplied power, and the radio frequency signal,
Amplifying means for amplifying with a gain according to the level of the control voltage;
Temperature coefficient storage means for storing a temperature coefficient indicating the amount of change in the transmission output with respect to a unit change in the ambient temperature obtained using the own unit, and a unit of the supply voltage obtained using the own unit. Voltage coefficient storage means for storing a voltage coefficient indicating the amount of change of the transmission output with respect to the change, and channel coefficient storing the channel coefficient obtained using the own unit and indicating the amount of change of the transmission output with respect to the unit channel change Storage means; control voltage versus output coefficient storage means for storing a control voltage versus output coefficient obtained by using the own unit and indicating an amount of change in transmission output with respect to a unit change of the control voltage; and the temperature detecting means The deviation of the transmission output due to the change of the ambient temperature based on the detected ambient temperature and the temperature coefficient stored in the temperature coefficient storage means, The deviation of the transmission output due to the change of the voltage of the supply electric power based on the stored voltage coefficient to the voltage coefficient storing means and the detected voltage by the detecting means,
A deviation of a transmission output according to a channel used for transmission based on a channel used for transmission of the radio frequency signal and a channel coefficient stored in the channel coefficient storage unit, and further a transmission output to be obtained and the control voltage. A control voltage applied to the amplifying means such that the deviation of the transmission output according to the control voltage level is compensated based on the control voltage versus the output coefficient stored in the output coefficient storage means and the transmission output becomes a desired level. And the transmission output deviation compensating means for determining the baseband unit, the characteristics of the wireless unit do not affect the baseband unit, and the baseband unit does not need to consider the characteristics of the wireless unit. The wireless unit can be set regardless of the wireless unit to which the operation condition is assembled.

According to the second aspect of the present invention, a radio frequency signal arriving via a radio line is converted into a baseband signal and supplied to the baseband unit. In the unit, a temperature detecting means for detecting an ambient temperature, a voltage detecting means for detecting a voltage of externally supplied power, and a receiving level signal for generating a receiving level signal having a level corresponding to the receiving level of the radio frequency signal Generating means, temperature coefficient storage means for storing a temperature coefficient obtained by using the own unit and indicating a change amount of the level of the reception level signal with respect to a unit change of the ambient temperature, and obtained by using the own unit. A voltage coefficient storage means for storing a voltage coefficient indicating a level change amount of the reception level signal with respect to a unit change of the supply voltage. And channel coefficient storage means for storing a channel coefficient obtained by using the own unit and indicating a level change amount of the reception level signal with respect to a unit channel change, and an ambient temperature detected by the temperature detection means. Based on the temperature coefficient stored in the temperature coefficient storage means, the deviation of the level of the reception level signal due to a change in ambient temperature is stored in the voltage detected by the voltage detection means and in the voltage coefficient storage means. The deviation of the level of the reception level signal due to the change in the voltage of the supplied power based on the voltage coefficient and the channel used for transmitting the radio frequency signal and the channel coefficient stored in the channel coefficient storage means. And compensating for the level deviation of the reception level signal corresponding to the channel used for transmission based on The baseband unit obtains a reception level signal with little deviation in the baseband unit since the reception level signal correction means for correcting the reception level signal so that the level of the level signal has a predetermined relationship with the level of the reception signal. Therefore, there is no need to compensate for the reception level signal in consideration of the characteristics of the wireless unit. Therefore, it is not necessary to consider the characteristics of the wireless unit on the baseband unit side, and the wireless unit can set the operation conditions of the baseband unit regardless of the wireless unit to be assembled.

According to the third invention, in addition to the second invention, an attenuating means for attenuating the radio frequency signal,
Strong input detection means for detecting a predetermined strong input state; and attenuation for attenuating the radio frequency signal by the attenuation means when the strong input state is detected by the strong input detection means. Control means, and the reception level signal correction means corrects the reception level signal in consideration of the amount of attenuation by the attenuation means. A reception level signal indicating the level is output. Therefore, it is not necessary to consider the characteristics of the wireless unit on the baseband unit side, and the wireless unit can set the operation conditions of the baseband unit regardless of the wireless unit to be assembled.

According to the fourth aspect of the present invention, the function of connecting to the baseband unit and converting the baseband signal supplied from the baseband unit to a radio frequency signal for radio transmission, and a radio line In a wireless unit having at least one of a function of converting a radio frequency signal arriving via the device to a baseband signal and providing the baseband signal to the baseband unit, at least one of constituent circuits for performing power control for battery saving Power control means for controlling the power of the unit
Since the number of power control objects from the baseband unit is reduced, the number of signals transmitted to and received from the baseband unit is reduced, and the wireless unit can have a simplified interface.

According to the fifth aspect of the present invention, the power supply control means in the fourth aspect of the present invention controls all the power supplies of the constituent circuits for controlling the power supply for battery saving. Therefore, there is no need to transmit and receive signals to and from the baseband unit, and as a result, the number of signals to be transmitted to and received from the baseband unit is reduced, and the wireless unit can simplify the interface. .

According to the sixth aspect of the present invention, a radio frequency signal arriving via a radio line is converted into a baseband signal and supplied to the baseband unit. In the unit, attenuating means for attenuating the radio frequency signal, strong input detecting means for detecting a predetermined strong input state,
Attenuating control means for attenuating the radio frequency signal by the attenuating means when the strong input detecting means detects the strong input state. There is no need to receive control for signal attenuation processing from the baseband unit, and as a result, the number of signals transmitted to and received from the baseband unit can be reduced, and the wireless unit can have a simplified interface.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main configuration of a wireless unit according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a detailed configuration of a control unit 46 in FIG.

FIG. 3 is a timing chart showing the contents of power control by a timing control unit 46f in FIG. 2;

FIG. 4 is a block diagram showing a configuration example of a conventional wireless unit.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 wireless unit 200 measuring instrument 1 I / Q modulation section 3 gain control amplifiers 4, 14, 17 mixers 6, 11, 16, 18 bandpass filter 7 driver 8 power amplifier 9 antenna switch 13 ... Low noise amplifier 19 ... Intermediate frequency amplifier 20 ... RSSI detector 21 ... PLL unit 22 ... Crystal oscillator 23 ... First voltage controlled oscillator (first VCO) 24 ... Second voltage controlled oscillator (second VCO) 25,26 ... Regulator 27 ... Voltage sensor 28 ... Temperature sensor 31 ... D / A converter 32 ... Antenna terminal 33,34,35 ... Attenuator 36 ... Strong input detector 37,38,42,43 ... A / D converter 39,40 ... Low pass Filter 41 Switch unit 44 Interface unit 45 D / A converter 46 Control unit 46a Transmission Force adjusting unit 46b ... RSSI correction section 46c ... RSSI output unit 46d ... correction information management unit 46e ... correction information memory 46f ... timing controller 46 g ... timing information memory 46h ... main control unit

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (6)

[Claims] 1. A temperature detecting means for detecting an ambient temperature in a wireless unit which is used by being connected to a baseband unit and converts a baseband signal supplied from the baseband unit into a radio frequency signal and wirelessly transmits the radio frequency signal. Voltage detecting means for detecting the voltage of externally supplied electric power; amplifying means for amplifying the radio frequency signal with a gain according to the level of the control voltage; and ambient temperature obtained by using its own unit. Temperature coefficient storage means for storing a temperature coefficient indicating a change amount of the transmission output with respect to a unit change of the voltage; and a voltage coefficient obtained by using the own unit and indicating a change amount of the transmission output with respect to the unit change of the supply voltage. Voltage coefficient storage means for storing a change in the transmission output with respect to a change in the unit channel obtained using the own unit. Channel coefficient storage means for storing a channel coefficient, and control voltage versus output coefficient storage for storing a control voltage versus output coefficient obtained by using its own unit and indicating an amount of change in transmission output with respect to a unit change of the control voltage. Means, a deviation of the transmission output due to a change in the ambient temperature based on the ambient temperature detected by the temperature detection means and the temperature coefficient stored in the temperature coefficient storage means, the voltage detected by the voltage detection means The deviation of the transmission output due to the change in the voltage of the supplied power based on the voltage coefficient stored in the voltage coefficient storage means and the channel used for transmitting the radio frequency signal and stored in the channel coefficient storage means. The deviation of the transmission output according to the channel used for transmission based on the channel coefficient, and further the transmission output to be obtained and the control voltage versus the output coefficient Based on the control voltage versus the output coefficient stored in the storage means, a deviation of the transmission output corresponding to the level of the control voltage is compensated, and a control voltage to be applied to the amplification means is determined so that the transmission output becomes a desired level. A wireless unit comprising transmission output deviation compensating means. 2. A wireless unit which is used by being connected to a baseband unit, converts a radio frequency signal arriving via a wireless line into a baseband signal, and supplies the baseband signal to the baseband unit. Temperature detecting means, a voltage detecting means for detecting a voltage of externally supplied electric power, a receiving level signal generating means for generating a receiving level signal having a level corresponding to the receiving level of the radio frequency signal, Temperature coefficient storage means for storing a temperature coefficient indicating the amount of change in the level of the reception level signal with respect to a unit change in the ambient temperature, which is obtained using the unit; and Voltage coefficient storage means for storing a voltage coefficient indicating a level change amount of the reception level signal with respect to a unit change; Channel coefficient storage means for storing a channel coefficient indicating the amount of change in the level of the reception level signal with respect to a unit channel change, which has been obtained in the unit channel change; and an ambient temperature detected by the temperature detection means and the temperature coefficient storage means. A deviation of the level of the reception level signal due to a change in the ambient temperature based on the stored temperature coefficient is calculated based on the voltage detected by the voltage detection unit and the voltage coefficient stored in the voltage coefficient storage unit. The deviation of the level of the reception level signal due to the change in the voltage of the supply power is further transmitted to the transmission based on the channel used for transmission of the radio frequency signal and the channel coefficient stored in the channel coefficient storage means. The level difference of the reception level signal is compensated by compensating for the deviation of the level of the reception level signal according to the channel used. And a reception level correction means for correcting the reception level signal so as to make a predetermined relationship with the level of the reception signal. 3. An attenuating means for attenuating the radio frequency signal; a strong input detecting means for detecting a predetermined strong input state; and a strong input state detected by the strong input detecting means. Attenuating control means for attenuating the radio frequency signal by the attenuating means, and the receiving level signal correcting means corrects the receiving level signal in consideration of an amount of attenuation by the attenuating means. The wireless unit according to claim 2, wherein: 4. A function to be used by being connected to a baseband unit, converting a baseband signal given from the baseband unit into a radio frequency signal and transmitting the radio frequency signal, and a radio frequency signal arriving via a radio line. In a wireless unit having at least one of a function of converting a signal into a baseband signal and providing the baseband signal to the baseband unit, a power supply for performing power control of at least a part of a constituent circuit to perform power control for battery saving A wireless unit comprising control means. 5. The wireless unit according to claim 4, wherein said power supply control means controls all power supplies of a constituent circuit to perform power supply control for battery saving. 6. A radio unit which is used by being connected to a baseband unit and converts a radio frequency signal arriving via a radio line into a baseband signal and provides the baseband unit with the radiofrequency signal. A strong input detecting means for detecting a predetermined strong input state; and when the strong input state is detected by the strong input detecting means, A wireless unit, comprising: attenuation control means for attenuating a radio frequency signal.