JP4342642B2 - Wireless unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is applied to, for example, a PHS (Personal Handyphone System) terminal and the like, and is a radio that performs processing such as converting a baseband signal into a radio frequency signal for wireless transmission or converting a radio frequency signal into a baseband signal. Regarding the unit.
[0002]
[Prior art]
A wireless unit and a baseband unit are known as main units constituting the PHS terminal.
[0003]
FIG. 4 is a diagram showing a main configuration of a conventional wireless unit used for a PHS terminal.
[0004]
As shown in this figure, the 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 15, band pass filter 16, mixer 17, band pass filter 18, intermediate frequency amplifier 19, RSSI detector 20, PLL unit 21, crystal A vibrator 22, a first voltage controlled oscillator 23, a second voltage controlled oscillator 24, regulators 25 and 26, a voltage sensor 27, a temperature sensor 28, and power switches 29, 30, 31, 32, 33, 34 and 35 are provided. Yes.
[0005]
Now, this conventional wireless unit is connected to the baseband unit and operates. However, the wireless unit has only an analog system as shown in FIG. 4, and a digital system such as a control unit is a baseband unit. It has become common sense to be mounted on.
[0006]
For this reason, in addition to the IF output terminal for supplying the baseband unit with the received signal down-converted to the intermediate frequency band, and the IF input terminal for capturing the intermediate frequency band transmission signal (I, Q) from the baseband unit. RX power SW terminal, RSSI output terminal, VCO power SW terminal, L DET output terminal, DATA input terminal, CK input terminal, STB input terminal, BS input terminal, ANT SW terminal, SYSCK output terminal, two PA SW terminals, Various signals and information are exchanged with the baseband unit such as TX BS terminal, two IF input terminals, P CONT input terminal, 3.6V power supply terminal, REG control input terminal, BATT output terminal and TEMP output terminal. A connection terminal is provided for this purpose.
[0007]
In some cases, there are some attenuators for attenuating the 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. In this case, a terminal for outputting the detection signal of the strong input detection unit to the baseband unit and several input terminals for controlling the operation of the attenuator are provided.
[0008]
As described above, since the conventional wireless unit needs to exchange a large number of signals and information with the baseband unit, there are problems such as a complicated interface and a large connector.
[0009]
Now, the RSSI signal generated by the RSSI detection unit 20 is given to the baseband unit via the RSSI output terminal, and is used to determine the reception level at the baseband unit.
[0010]
However, since the RSSI signal generated by the RSSI detection unit 20 has a difference between channels, a deviation due to a temperature change, or a deviation due to a power supply voltage variation for each wireless unit, the baseband unit corrects the RSSI signal. Is going.
[0011]
On the other hand, the gain control amplifier 3 is for adjusting the level of the transmission output. The gain is controlled by the P CONT signal given from the baseband unit via the P CONT input terminal.
[0012]
However, the characteristic of the gain control amplifier 3 is that the P CONT signal is corrected in the baseband unit because the deviation between channels, the deviation due to the temperature change, or the deviation due to the power supply voltage variation varies for each radio unit.
[0013]
Specifically, the baseband unit is previously provided with an average characteristic of the wireless unit as a representative value. When the wireless unit is actually assembled, an error between the characteristic of the wireless unit and the representative value previously obtained is obtained, and correction information is created based on this. During operation, correction of the RSSI signal and correction of the P CONT signal are performed using the correction information.
[0014]
Since the setting of correction information in such a baseband unit must be performed after pairing with a wireless unit, a user who intends to construct a system by assembling the wireless unit and the baseband unit performs the work. It had to be very troublesome.
[0015]
Moreover, if the pair breaks down after one of them is replaced, the work for setting the conditions for correction in the baseband unit must be performed again, which makes maintenance work extremely troublesome. .
[0016]
Also, the operation timing of each part of the wireless unit is also controlled from the baseband unit. However, the optimal control timing for fully exhibiting wireless performance is based on a thorough understanding of the characteristics of the wireless unit. It was necessary to set the control timing in the system properly, which was very troublesome.
[0017]
[Problems to be solved by the invention]
As described above, the conventional radio unit operates by receiving various signals necessary for control to the baseband unit and operating under control from the baseband unit. Conditions could only be set after the pair with the wireless unit was confirmed.
[0018]
In addition, the conventional wireless unit has a problem that the interface becomes complicated because a large number of signals must be exchanged with the baseband unit.
[0019]
The present invention has been made in consideration of such circumstances, and the object of the present invention is firstly to allow the baseband unit side operation conditions to be set regardless of the wireless unit to be assembled. To provide a wireless unit.
[0020]
A second object of the present invention is to provide a wireless unit capable of reducing the number of signals exchanged with the baseband unit and simplifying the interface.
[0021]
[Means for Solving the Problems]
In order to achieve the first object, the first invention is used by being connected to a baseband unit, and wirelessly transmits a radio frequency signal by converting a baseband signal provided from the baseband unit. In the unit, the temperature detection means such as a temperature sensor for detecting the ambient temperature, the voltage detection means such as a voltage sensor for detecting the voltage of the power supplied from the outside, and the radio frequency signal according to the level of the control voltage. Amplifying means such as a gain control amplifier that amplifies with a gain, and a correction coefficient memory such as a correction information memory that stores a temperature coefficient that indicates the amount of change in transmission output with respect to a unit change in ambient temperature that is obtained using its own unit. The amount of change in the transmission output with respect to the unit change of the supply voltage was obtained by using the temperature coefficient storage means and its own unit. Voltage coefficient storage means such as a correction information memory that stores the pressure coefficient, and a correction coefficient memory such as a correction information memory that stores a channel coefficient that is obtained by using the unit and indicates the amount of change in transmission output with respect to a unit channel change. Channel coefficient storage means and control voltage vs. output coefficient such as a correction information memory which stores the control voltage vs. output coefficient which is obtained using its own unit and indicates the amount of change in the transmission output with respect to the unit change in the control voltage Based on the storage means, the ambient temperature detected by the temperature detection means, and the temperature coefficient stored in the temperature coefficient storage means, a deviation in transmission output due to a change in ambient temperature is detected by the voltage detection means. Based on the voltage and the voltage coefficient stored in the voltage coefficient storage means, the deviation of the transmission output accompanying the change in the voltage of the supplied power is calculated. The transmission output and the control voltage to further obtain the deviation of the transmission output according to the channel used for transmission based on the channel used for transmission of the radio frequency signal and the channel coefficient stored in the channel coefficient storage means A control voltage applied to the amplifying means so that the transmission output becomes a desired level by compensating for the deviation of the transmission output according to the level of the control voltage based on the control voltage versus the output coefficient stored in the output coefficient storage means. For example, transmission output deviation compensation means such as a transmission output adjustment unit.
[0022]
By taking such means, the deviation of the transmission output is compensated within the wireless unit according to the actual characteristics of the wireless unit. Therefore, the characteristics of the wireless unit do not affect the baseband unit, and it is not necessary to consider the characteristics of the wireless unit on the baseband unit side.
[0023]
In order to achieve the first object, the second invention is used by being connected to a baseband unit, and converts a radio frequency signal arriving through a radio line into a baseband signal to convert the baseband signal. In the wireless unit applied to the unit, temperature detecting means such as a temperature sensor for detecting the ambient temperature, voltage detecting means such as a voltage sensor for detecting the voltage of externally supplied power, and the reception level of the radio frequency signal A reception level signal generating means such as an RSSI detector for generating a reception level signal having a level corresponding to the signal level, and a change amount of the level of the reception level signal with respect to a unit change of the ambient temperature obtained using the own unit Temperature coefficient storage means such as a correction information memory that stores the temperature coefficient indicating The voltage coefficient storage means such as a correction information memory that stores the voltage coefficient indicating the amount of change in the level of the reception level signal relative to the unit change in the supply voltage, and the unit channel change obtained by using the own unit Channel coefficient storage means such as a correction information memory that stores the channel coefficient indicating the amount of change in the level of the reception level signal with respect to the ambient temperature detected by the temperature detection means and the temperature coefficient storage means Based on the temperature coefficient, the level difference of the reception level signal with the change of the ambient temperature is determined based on the voltage detected by the voltage detection means and the voltage coefficient stored in the voltage coefficient storage means. Used for transmission of the radio frequency signal. Based on the channel and the channel coefficient stored in the channel coefficient storage means, the deviation of the level of the reception level signal corresponding to the channel used for transmission is compensated, respectively, so that the level of the reception level signal is the level of the reception signal. For example, reception level signal correction means such as an RSSI correction unit for correcting the reception level signal so as to have a predetermined relationship with the level is provided.
[0024]
By taking such means, the deviation of the reception level signal is compensated in the radio unit according to the actual characteristic of the radio unit. Accordingly, the baseband unit can obtain a reception level signal with almost no deviation, and there is no need to compensate the reception level signal in consideration of the characteristics of the wireless unit.
[0025]
In addition to the second invention, the third invention is an attenuation means comprising, for example, three attenuators for attenuating the radio frequency signal, and a strong input detection unit for detecting a predetermined strong input state, for example. A strong input detecting means, and when the strong input detecting means detects the strong input state, the attenuating means attenuates the radio frequency signal, for example, comprising a main controller and a timing controller. Attenuation control means, and the reception level signal correction means corrects the reception level signal in consideration of the attenuation amount by the attenuation means.
[0026]
Even if the level of the received signal is reduced by performing attenuation by the attenuation unit, the reception level signal indicating the correct received signal level before being attenuated is output. Is done.
[0027]
In order to achieve the second object, the fourth invention is used by being connected to a baseband unit. The baseband signal given from the baseband unit is converted into a radio frequency signal and transmitted by radio. Power control for battery saving should be performed in a wireless unit having at least one of a function and a function of converting a radio frequency signal arriving via a wireless line into a baseband signal and supplying the baseband signal to the baseband unit For example, power control means such as a timing control unit for controlling power of at least a part of the constituent circuits is provided.
[0028]
By taking such means, the power supply control from the baseband unit is not necessary for the configuration circuit that is controlled by the power supply control means, and the number of power control targets from the baseband unit is reduced.
[0029]
In a fifth aspect of the invention, the power source control means in the fourth aspect of the invention controls all the power sources of the constituent circuits that are to perform power source control for battery saving.
[0030]
By taking such means, power control from the baseband unit is completely unnecessary.
[0031]
In order to achieve the second object, a sixth invention is used by being connected to a baseband unit, and converts a radio frequency signal arriving through a radio line into a baseband signal to convert the baseband signal. In the radio unit to be given to the unit, an attenuation unit composed of, for example, three attenuators that attenuate the radio frequency signal, a strong input detection unit such as a strong input detection unit that detects a predetermined strong input state, When the strong input detecting means detects that the input state is strong, the attenuation means includes an attenuation control means comprising a main control unit and a timing control unit for attenuating the radio frequency signal by the attenuation unit.
[0032]
By taking such a means, the attenuation process of the radio frequency signal for coping with a strong input is performed in a closed loop in the radio unit, and it is not necessary to receive control from the baseband unit.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0034]
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.
[0035]
In this figure, what is indicated by reference numeral 100 is a radio unit of the present embodiment, and includes an I / Q modulator 1, a gain control amplifier 3, a mixer 4, a bandpass filter 6, a driver 7, and a power amplifier 8. , Antenna switch 9, band pass filter 11, low noise amplifier 13, mixer 14, band pass filter 16, mixer 17, band pass filter 18, intermediate frequency amplifier 19, RSSI detector 20, PLL unit 21, crystal resonator 22, A first voltage controlled oscillator (hereinafter referred to as a first VCO) 23, a second voltage controlled oscillator (hereinafter referred to as a second VCO) 24, regulators 25 and 26, a voltage sensor 27, a temperature sensor 28, a D / A converter 31, Antenna terminal 32, attenuators 33, 34, 35, strong input detector 36, A / D converters 37, 38, low-pass filter Filter 39 and 40, a switch unit 41, A / D converters 42 and 43, interface unit 44, D / A converter 45 and control unit 46.
[0036]
An intermediate frequency band transmission signal given from a baseband unit (not shown) is input to the I / Q modulation unit 1 individually from the I system and the Q system, and is supplied from the second VCO 24 to the I / Q modulation unit 1. Modulated using a local signal.
[0037]
The modulated transmission signal is amplified with an arbitrary gain by the gain control amplifier 3 to adjust the transmission level, and then synthesized by the first local signal output from the first VCO 23 and the mixer 4 so that the radio frequency band is obtained. Upconverted. The gain of the gain control amplifier 3 is controlled by a gain control signal supplied from the control unit 46 via the D / A converter 31.
[0038]
The transmission signal in the radio frequency band is amplified to a level at which radio transmission is possible by the driver 7 and the power amplifier 8 after unnecessary frequency components are removed by the band pass filter 6.
[0039]
Thereafter, the transmission signal is supplied to the antenna 12 connected to the antenna terminal 32 via the antenna switch 9 and the bandpass filter 11 and is transmitted by radio.
[0040]
On the other hand, the received signal converted by the antenna 12 from the incoming radio wave is given 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 reception level is high, the level is adjusted by being appropriately attenuated by the attenuators 33, 34, and 35.
[0041]
The reception signal whose level has been adjusted in this way is sent from the first local signal output from the first VCO 23 and the mixer 14, and further from the second local signal output from the second VCO 24 and the mixer 17, respectively. By being synthesized, it is down-converted to an intermediate frequency band. Each time the signal is combined with the local signal, unnecessary components of the received signal are removed by the bandpass filters 16 and 18.
[0042]
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.
[0043]
The reception signal output from the mixer 14 is also input to the strong input detection unit 36. The strong input detection unit 36 monitors the level of the reception signal output from the mixer 14 and outputs a strong input detection signal indicating whether or not a predetermined strong input state is set. The strong input detection signal output by the strong input detection unit 36 is digitized by the A / D converter 37 and then given to the control unit 46.
[0044]
Now, the RSSI detection unit 20 connected to the intermediate frequency amplifier 19 generates a DC voltage proportional to the received input level (RSSI) and outputs it to output an RSSI signal whose level changes in accordance with the change in RSSI. . The RSSI signal is digitized by the A / D converter 38 and then supplied to the control unit 46.
[0045]
The PLL unit 21 includes a first PLL 21a, a second PLL 21b, a crystal oscillator 21c, and a buffer 21d.
[0046]
The first PLL 21a feeds back the output of the first VCO 23 via the low-pass filter 39, and controls the transmission frequency of the first VCO 23 so that the first local oscillation signal becomes a predetermined output.
[0047]
The second PLL 21b feeds back the output of the second VCO 24 via the low-pass filter 40, and controls the transmission frequency of the second VCO 24 so that the second local oscillation signal becomes a predetermined output.
[0048]
The crystal oscillator 21c generates a system clock having a predetermined frequency from the reference signal output from the crystal resonator 22, and outputs this system clock from the SYS CK output terminal to the baseband unit via the buffer 21d.
[0049]
The PLL unit 21 outputs a lock detection signal L DET which is at a high level when the phase comparisons in the phase comparator coincide with each other and is in a pulse state at other times.
[0050]
The regulators 25 and 26 receive 3.6 V power from the baseband unit via the 3.6 V power supply terminal and generate 3 V and 2.8 V power. The electric power generated by the regulators 25 and 26 is supplied to the following units via the switch unit 41.
[0051]
a. Low noise amplifier 13 and mixer 14
b. Mixer 17
c. Intermediate frequency amplifier 19 and RSSI detector 20
d. First VCO23
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. Strong input detection unit 36
The switch unit 41 can individually turn on / off the outputs a to s, and turn them on / off under the control of the control unit 46.
[0052]
The voltage sensor 27 outputs a voltage detection signal having a level corresponding to the voltage of power supplied from the baseband unit via the 3.6V power supply terminal. This voltage detection signal is digitized by the A / D converter 42 and then supplied to the control unit 46.
[0053]
The temperature sensor 28 outputs a temperature detection signal at a level corresponding to the ambient temperature. This temperature detection signal is digitized by the A / D converter 43 and then given to the control unit 46.
[0054]
The interface unit 44 converts the measurement signal output from the measuring instrument 200 connected at the time of the correction condition setting operation described later into a form that can be captured by the control unit 46, and supplies the converted signal to the control unit 46. The measuring device 200 is connected to the antenna terminal 32 during the correction condition setting operation, and measures the level of a transmission signal and outputs a reception signal for testing.
[0055]
The D / A converter 45 converts the digital RSSI signal supplied from the control unit 46 into an analog signal, and then outputs the analog RSSI signal to the baseband unit via the RSSI output terminal.
[0056]
As shown in FIG. 2, the control unit 46 includes a transmission output adjustment unit 46a, RSSI correction unit 46b, RSSI output unit 46c, correction information management unit 46d, correction information memory 46e, timing control unit 46f, timing information memory 46g, and main information. A control unit 46h is provided.
[0057]
The transmission output adjustment unit 46a corrects the level of the gain control signal output from the main control unit 46h in consideration of the correction information provided from the correction information management unit 46d. The transmission output adjusting unit 46 a supplies the corrected gain control signal to the gain control amplifier 3 via the D / A converter 31.
[0058]
The RSSI correction unit 46 b is provided with the RSSI signal output from the RSSI detection unit 20 and digitized by the A / D converter 38. The RSSI correction unit 46b receives 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 gives the corrected RSSI signal to the RSSI output unit 46c.
[0059]
The RSSI output unit 46 c outputs the RSSI signal given from the RSSI correction unit 46 b to a baseband unit (not shown) via the D / A converter 45.
[0060]
When the correction information management unit 46d is in the correction condition setting state, the voltage detection signal from the A / D converter 42, the temperature detection signal from the A / D converter 43, and the measurement value at the measuring device 200 from the interface unit 44 are displayed. The RSSI correction unit 46b gives an uncorrected RSSI signal, and the main control unit 46h gives channel (CH) designation information, attenuator information and RF input level information. Then, in the correction condition setting state, the correction information management unit 46d generates correction information for generating the gain control signal and correction information for the RSSI signal based on the input information, and stores them in the correction information memory 46e.
[0061]
In the normal operation state with respect to the correction information management unit 46d, the voltage detection signal from the A / D converter 42, the temperature detection signal from the A / D converter 43, and the channel (CH) designation information from the main control unit 46h. And attenuator information is provided respectively. In the normal operation state, the correction information management unit 46d takes out the correction information for generating the gain control signal and the correction information for the RSSI signal from the correction information memory 46e based on the input information, and performs gain control. The correction information for signal generation is given to the transmission output adjustment unit 46a, and the correction information for RSSI signal is given to the RSSI correction unit 46b.
[0062]
The timing control unit 46f controls the operation timing of each unit by controlling the switch unit 41 based on timing information registered in advance in the timing information memory 46g.
[0063]
The main control unit 46h is provided with control information of transmission control (Tx), reception control (Rx), channel control (CH), standby control, and slot control from a baseband unit (not shown). In addition to the transmission output adjustment unit 46a, the RSSI correction unit 46b, the correction information management unit 46d, and the timing control unit 46f in the control unit 46, the main control unit 46h includes the PLL unit 21 and the A / D converter 37, respectively. It is connected.
[0064]
The main control unit 46h controls operations of the transmission output adjustment unit 46a, the RSSI correction unit 46b, the correction information management unit 46d, the timing control unit 46f, and the PLL unit 21 while referring to various types of input information.
[0065]
Next, the operation of the wireless unit 100 configured as described above will be described. The basic operation related to transmission / reception is the same as that of a conventional wireless unit, and thus the description thereof will be omitted. Here, some characteristic operations of the present invention will be mainly described.
[0066]
[Correction of gain control signal and RSSI signal]
First, correction conditions are set when the wireless unit 100 is manufactured.
[0067]
In this correction condition setting, the measuring device 200 is connected to the antenna terminal 32 and the interface unit 44 as shown in FIG. 1, and the control unit 46 is set to the correction condition setting state. The ambient temperature is a predetermined reference temperature (for example, 25 ° C.).
[0068]
Further, the baseband unit is set in a transmission state, and the I and Q inputs (I and Q) given from the baseband unit are modulated by the I / Q modulation unit 1 to be an IF band and then output.
[0069]
Then, the output level from the antenna terminal 32 at this time is measured by the measuring device 200, and the measurement result is taken into the correction information management unit 46d via the interface unit 44.
[0070]
The correction information management unit 46d confirms the measurement result, determines whether or not 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 adjustment unit 46 a controls the gain of the gain control amplifier 3 by sending a gain control signal corresponding to the instruction to the gain control amplifier 3 via the D / A converter 31.
[0071]
The correction information management unit 46d uses the digital value that the transmission output adjustment unit 46a outputs 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, as a correction information memory. 46e is stored.
[0072]
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 the L channel, M channel, and H channel are A1, A2, and A3, respectively.
[0073]
Other data necessary for correcting the gain control signal includes a temperature coefficient, a voltage coefficient, a channel coefficient, and a control voltage versus output change coefficient.
[0074]
The correction information management unit 46d measures the difference between the gain control signal level at which the transmission output becomes a predetermined level between when the ambient temperature is the predetermined value T1 and when the ambient temperature is the predetermined value T2 larger than T1, By dividing this level difference by the temperature difference (T2−T1), a temperature coefficient α [dB / ° C.] is obtained, and the temperature coefficient α is stored in the correction information memory 46e.
[0075]
The correction information management unit 46d has a gain control signal level at which the transmission output becomes a predetermined level, when the supply voltage from the baseband unit is a predetermined value V1 and when the supply voltage is a predetermined value V2 larger than V1. The difference is measured, and the level difference is divided by (V2−V1) to obtain the voltage coefficient β [dB / V], and this voltage coefficient β is stored in the correction information memory 46e.
[0076]
The correction information management unit 46d measures the difference between the gain control signal level at which the transmission output becomes a predetermined level between the L channel and the M channel, and divides this level difference by the number of channels between the LM channels. Thus, the channel coefficient γ1 [dB / channel] is obtained. The correction information management unit 46d measures the difference between the gain control signal level at which the transmission output becomes a predetermined level between the M channel and the H channel, and this level difference is determined by the number of channels between the MH channels. A channel coefficient γ2 [dB / channel] is obtained by division. Then, the correction information management unit 46d stores the channel coefficients γ1 and γ2 in the correction information memory 46e.
[0077]
Further, the correction information management unit 46d measures 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. The control voltage vs. output change coefficient B [dB / V] is obtained by dividing this level difference by (C2-C1), and this control voltage vs. output change coefficient B is stored in the correction information memory 46e.
[0078]
In any calculation of the above various coefficients, the undefined ones of the ambient temperature, the supply voltage, and the used channel are fixed to a predetermined state.
[0079]
On the other hand, the RSSI signal generated by the RSSI detection unit 20 with the test reception signal output from the measuring instrument 200 at a predetermined level is not corrected by the RSSI correction unit 46b, and the correction information management unit 46d. Lead to.
[0080]
Data necessary for correcting the RSSI signal includes a temperature coefficient, a voltage coefficient, and a channel coefficient.
[0081]
The correction information management unit 46d measures the difference between the RSSI signal when the ambient temperature is the predetermined value T1 and the RSSI signal at the predetermined value T2 where the ambient temperature is greater than T1, and divides this difference by (T2−T1). Thus, the temperature coefficient δ [bit / ° C.] is obtained, and the temperature coefficient δ is stored in the correction information memory 46e.
[0082]
The correction information management unit 46d measures the level difference between the RSSI signal when the supply voltage from the baseband unit is the predetermined value V1 and the RSSI signal when the supply voltage is the predetermined value V2 larger than V1, The voltage coefficient ε [bit / V] is obtained by dividing the level difference by (V2−V1), and the voltage coefficient ε is stored in the correction information memory 46e.
[0083]
The correction information management unit 46d measures the level difference between the RSSI signal in the L channel and the RSSI signal in the M channel, and obtains the channel coefficient ζ1 by dividing the level difference by the number of channels between the LM channels. 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 obtains the channel coefficient ζ2 by dividing the level difference by the number of channels between the MH channels. Then, the correction information management unit 46d stores the channel coefficients ζ1 and ζ2 in the correction information memory 46e.
[0084]
As described above, correction information for the gain control signal and the RSSI signal is generated and stored in the correction information memory 46e.
[0085]
In any calculation of the above various coefficients, the undefined ones of the ambient temperature, the supply voltage, and the used channel are fixed to a predetermined state.
[0086]
Then, using the correction information generated in this way, the gain control signal and the RSSI signal are corrected as follows.
[0087]
In a state in which the gain control signal and the RSSI signal are corrected, that is, in an actual operation state, the correction information management unit 46d receives the initial adjustment values A1, A2, A3, the temperature coefficient α, the voltage coefficient β, and the channel coefficient γ1 from the correction information memory 46e. , Γ2 and control voltage versus output change coefficient B are extracted, and each of these correction information is given to the transmission output adjustment unit 46a. The correction information management unit 46d extracts the temperature coefficient δ, the voltage coefficient ε, and the channel coefficients ζ1 and ζ2 from the correction information memory 46e, and provides each of these correction information to the RSSI correction unit 46b.
[0088]
Further, the correction information management unit 46d calculates the current power supply voltage based on the voltage detection signal supplied from the A / D converter 42 and the current ambient temperature based on the temperature detection signal supplied from the A / D converter 43. Further, the currently used channels are determined based on channel information given from the main control unit 46h, and these are notified to the transmission output adjustment unit 46a and the RSSI correction unit 46b, respectively. The correction information management unit 46d determines the current received signal attenuation amount based on the attenuator information given from the main control unit 46h, and notifies the RSSI correction unit 46b of this.
[0089]
The transmission output adjusting unit 46a receives this information and compensates for the level of the gain control signal given from the main control unit 46h so as to compensate for the interchannel deviation, temperature deviation and voltage deviation of the transmission power caused by the characteristics of the own unit. Correct appropriately.
[0090]
Further, the RSSI correction unit 46b receives these pieces of information, and changes the RSSI signal level given from the RSSI detection unit 20 via the A / D converter 38 to the RSSI channel-to-channel deviation, temperature deviation, and Correct appropriately to compensate for the voltage deviation.
[0091]
Thus, 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 adjusted appropriately to the target value. Therefore, on the baseband unit side, it is only necessary to specify the target value of the transmission output level without considering the characteristics of the wireless unit 100 at all.
[0092]
According to the present embodiment, the RSSI signal is output after its level is corrected according to the actual characteristics of the unit so that the relationship with the received input level is in a normal state. Therefore, on the baseband unit side, it is possible to easily and accurately determine the reception input level from the level of the RSSI signal output from the wireless unit 100.
[0093]
In the present embodiment, since the attenuation amount of the received signal by the attenuators 33, 34, and 35 is also taken into consideration for the correction of the RSSI signal, the correct received input level before being attenuated by these attenuators 33, 34, and 35 is shown. It is possible to generate an RSSI signal, and in determining the reception input level on the baseband unit side, it is only necessary to focus on the level of the RSSI signal.
[0094]
Conventionally, the characteristics of each wireless unit show a similar characteristic curve, and under the hypothesis that the displacement also moves in parallel, the average characteristic of many wireless units is given to the baseband unit as a representative value. The gain control voltage and the RSSI level are corrected in consideration of an error between the representative value and the actual characteristic of the wireless unit.
[0095]
For this reason, in the past, correction has not necessarily been performed accurately due to an error between the characteristic curve of the representative value and the actual characteristic curve of the wireless unit 100, or variations in the state of occurrence of deviation.
[0096]
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 in the wireless unit 100 without using the representative value. More accurate correction than before.
[0097]
By the way, the control voltage vs. output characteristics of the power amplifier 8 are not linear, and the characteristics generally change individually. Moreover, since the power amplifier 8 is generally close to the limit for reducing the current consumption, the variation in linearity is large.
[0098]
However, in the conventional correction method, such individual characteristics of the power amplifier 8 cannot be taken into consideration, so that the influence of the variation in linearity is suppressed to be small by reducing the maximum width of the correction so as not to apply the correction so much. It was.
[0099]
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 range can be increased, and the maximum value of the transmission output level is made larger than the conventional value. It becomes possible to do.
[0100]
[Power control]
For the battery saving, the timing control unit 46f is based on an instruction from the main control unit 46h (such as a lock notification of the PLL unit 21) and timing information stored in the timing information memory 46g, for example, as shown in FIG. The regulators 25 and 26 and the switch unit 41 are controlled so that power is supplied.
[0101]
As described above, according to the present embodiment, since the power control of each part in the wireless unit 100 is performed in the wireless unit 100, it is not necessary to fetch a large number of signals for power control from the baseband unit. Therefore, the number of signal lines with the baseband unit can be reduced.
[0102]
Furthermore, since the power supply control is performed in the wireless unit 100, there is no need to give the lock detection signal L DET to the baseband unit. Therefore, the number of signal lines with the baseband unit can be further reduced.
[0103]
In addition, since it is not necessary to control the power supply of the wireless unit 100 in the baseband unit, the troublesome work of appropriately setting the control timing in the baseband unit after the user fully understands the characteristics of the wireless unit 100 is not necessary. It becomes unnecessary.
[0104]
[Strong input processing]
The main control unit 46h periodically checks the strong input detection signal given from the strong input detection unit 36 via the A / D converter 37.
[0105]
When the strong input detection signal indicates a strong input state, the main control unit 46h instructs the timing control unit 46f to appropriately operate the attenuators 33, 34, and 35 according to the strong input state.
[0106]
Upon receiving this instruction, the timing control unit 46f operates the designated attenuator to attenuate the received signal.
[0107]
As described above, according to the present embodiment, since the attenuator control at the time of strong input is performed in the wireless unit 100 by a closed loop, the strong input detection signal and the control signals of the attenuators 33, 34, and 35 are exchanged with the baseband unit. There is no need to do. Therefore, the number of signal lines with the baseband unit can be reduced.
[0108]
The present invention is not limited to the above embodiment. For example, in the above embodiment, each control information of transmission control (Tx), reception control (Rx), channel control (CH), standby control and slot control is transmitted by individual signal lines. The number of signal lines can be further reduced if the transmission is performed via.
[0109]
In this case, further, the IF input is also digitized and transmitted through the serial interface, and the I component and the Q component are converted into analog signals and guided to the I / Q modulator 1. be able to. With such a configuration, the number of signal lines can be further reduced. In addition, since measurement of the gain control signal correction information can be performed including variations in I and Q outputs, it is possible to determine the gain control signal and compensate for the variations in I and Q outputs. There is no need for the user to do this.
[0110]
In the above embodiment, the power control of each part in the wireless unit 100 is all performed in the wireless unit 100. However, the power control related to a part of the constituent circuits is based on the control from the baseband unit side. May be. However, performing all in the wireless unit 100 has the greatest effect of reducing the number of signal lines.
[0111]
In addition, various modifications can be made without departing from the scope of the present invention.
[0112]
【The invention's effect】
According to the first invention, the ambient temperature is detected in the wireless unit that is used by being connected to the baseband unit and converts the baseband signal given from the baseband unit into a radio frequency signal and wirelessly transmits it. The temperature detection means, the voltage detection means for detecting the voltage of the power supplied from the outside, the amplification means for amplifying the radio frequency signal with a gain corresponding to the level of the control voltage, and the one obtained using the own unit The temperature coefficient storage means for storing the temperature coefficient indicating the change amount of the transmission output with respect to the unit change of the ambient temperature, and the change amount of the transmission output with respect to the unit change of the supply voltage obtained by using the own unit. The voltage coefficient storage means that stores the measured voltage coefficient and the amount of change in the transmission output with respect to the unit channel change obtained by using its own unit Channel coefficient storage means storing channel coefficients, and control voltage vs. output coefficient memory storing control voltage vs. output coefficient obtained by using its own unit and indicating the amount of change in transmission output with respect to the unit change of the control voltage And a voltage detected by the voltage detection means based on the ambient temperature detected by the temperature detection means and the temperature coefficient stored in the temperature coefficient storage means. And a deviation of the transmission output accompanying a 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 the channel coefficient storage means Based on the channel coefficient, the transmission output and the control voltage vs. output relation to obtain the deviation of the transmission output corresponding to the channel used for transmission. Based on the control voltage vs. output coefficient stored in the storage means, the transmission voltage deviation is compensated according to the control voltage level, and the control voltage applied to the amplification means is determined so that the transmission output becomes a desired level. The transmission output deviation compensation means is included, so that the characteristics of the wireless unit do not affect the baseband unit, it is not necessary to consider the characteristics of the wireless unit on the baseband unit side, and the operating conditions on the baseband unit side This is a wireless unit that can be set regardless of the wireless unit to be assembled.
[0113]
Further, according to the second invention, in the radio unit that is used by being connected to the baseband unit, the radio frequency signal that has arrived via the radio line is converted into a baseband signal and given to the baseband unit. Temperature detection means for detecting the ambient temperature, voltage detection means for detecting the voltage of power supplied from the outside, and reception level signal generation means for generating a reception level signal having a level corresponding to the reception level of the radio frequency signal; A temperature coefficient storage means that stores a temperature coefficient that indicates the amount of change in the level of the reception level signal with respect to a unit change in the ambient temperature, and that is calculated using the own unit. Voltage coefficient storage means for storing a voltage coefficient indicating an amount of change in the level of the reception level signal with respect to a unit change in the supply voltage; 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, the ambient temperature detected by the temperature detection means, and the temperature coefficient. Based on the temperature coefficient stored in the storage means, the deviation of the level of the reception level signal accompanying the change in the ambient temperature, the voltage detected by the voltage detection means, and the voltage coefficient stored in the voltage coefficient storage means Based on the difference in level of the reception level signal accompanying a change in the voltage of the supplied power, and further based on the channel used for transmission of the radio frequency signal and the channel coefficient stored in the channel coefficient storage means The reception level signal is compensated for each level deviation of the reception level signal according to the channel used for transmission. Since the reception level signal correcting means for correcting the reception level signal so that the level has a predetermined relationship with the level of the reception signal is provided, it is possible to acquire the reception level signal with almost no deviation in the baseband unit. There is no need to compensate 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 be set regardless of the wireless unit in which the operating conditions on the baseband unit side are assembled.
[0114]
According to the third invention, in addition to the second invention, the attenuating means for attenuating the radio frequency signal, the strong input detecting means for detecting a predetermined strong input state, and the strong input detection Attenuation control means for attenuating the radio frequency signal by the attenuation means when the strong input state is detected by the means, and the reception level signal correction means is an attenuation amount by the attenuation means. Since the reception level signal is corrected in consideration of the above, the reception level signal indicating the correct reception signal level in consideration of the attenuation amount by the attenuation means 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 be set regardless of the wireless unit in which the operating conditions on the baseband unit side are assembled.
[0115]
According to the fourth aspect of the invention, it is used by being connected to the baseband unit. The baseband signal given from the baseband unit is converted into a radio frequency signal and transmitted by radio, and via a radio line. In a wireless unit having at least one of the functions of converting an incoming radio frequency signal into a baseband signal and supplying the baseband signal to the baseband unit, at least a part of the power supply of a constituent circuit that is to perform power supply control for battery saving Since it has power control means to control, the number of power control targets from the baseband unit will decrease, and the radio unit that can reduce the number of signals exchanged with the baseband unit and simplify the interface It becomes.
[0116]
According to the fifth invention, since the power control means in the fourth invention performs all power control of the constituent circuits that should perform power control for battery saving, for power control. There is no need to send / receive signals to / from the baseband unit. As a result, the wireless unit can reduce the number of signals sent / received to / from the baseband unit and simplify the interface.
[0117]
According to a sixth aspect of the present invention, in a wireless unit that is used by being connected to a baseband unit, a radio frequency signal that has arrived via a wireless line is converted into a baseband signal and applied to the baseband unit. Attenuating means for attenuating the radio frequency signal; 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, And attenuating control means for attenuating the radio frequency signal by the attenuating means. Therefore, it is not necessary to receive control from the baseband unit for attenuation processing of the radio frequency signal to cope with strong input. The wireless unit can reduce the number of signals exchanged with the band unit and simplify the 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.
FIG. 4 is a block diagram illustrating a configuration example of a conventional wireless unit.
[Explanation of symbols]
100: Wireless unit
200: Measuring instrument
1 ... I / Q modulator
3. Gain control amplifier
4, 14, 17 ... Mixer
6, 11, 16, 18 ... band pass 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 resonator
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 detection unit
37, 38, 42, 43 ... A / D converter
39, 40 ... low-pass filter
41 ... Switch unit
44. Interface part
45 ... D / A converter
46 ... Control unit
46a: Transmission output adjustment unit
46b ... RSSI correction unit
46c ... RSSI output section
46d: Correction information management unit
46e ... Correction information memory
46f ... Timing control unit
46g ... Timing information memory
46h ... main control unit

Claims (6)

In the wireless unit that is used by being connected to the baseband unit, and converts the baseband signal given from this baseband unit into a radio frequency signal and wirelessly transmits it,
Temperature detecting means for detecting the ambient temperature;
Voltage detection means for detecting the voltage of power supplied from the outside;
Amplifying means for amplifying the radio frequency signal with a gain according to the level of the control voltage;
A temperature coefficient storage means for storing a temperature coefficient obtained by using the own unit and indicating a change amount of the transmission output with respect to a unit change of the ambient temperature;
Voltage coefficient storage means for storing a voltage coefficient obtained by using the own unit and indicating a change amount of the transmission output with respect to a unit change of the supply voltage;
Channel coefficient storage means for storing a channel coefficient obtained by using the own unit and indicating a change amount of the transmission output with respect to a unit channel change;
A control voltage vs. output coefficient storage means for storing a control voltage vs. output coefficient indicating the amount of change in transmission output with respect to a unit change of the control voltage as determined using the own unit;
Based on the ambient temperature detected by the temperature detection means and the temperature coefficient stored in the temperature coefficient storage means, a deviation in transmission output due to a change in ambient temperature is detected by the voltage detected by the voltage detection means and the voltage. Based on the voltage coefficient stored in the coefficient storage means, the transmission output deviation associated with the change in the voltage of the supplied power is calculated using the channel used for transmitting the radio frequency signal and the channel coefficient stored in the channel coefficient storage means. The level of the control voltage based on the transmission output to be obtained and the control voltage vs. output coefficient stored in the control voltage vs. output coefficient storage means. Transmission output deviation compensation that determines the control voltage to be applied to the amplification means so that the transmission output is at a desired level by compensating the transmission output deviation according to Radio unit, characterized by comprising a means. In a wireless unit that is used by being connected to a baseband unit, a radio frequency signal that has arrived via a wireless line is converted into a baseband signal and given to the baseband unit.
Temperature detecting means for detecting the ambient temperature;
Voltage detection means for detecting the voltage of power supplied from the outside;
Reception level signal generating means for generating a reception level signal having a level corresponding to the reception level of the radio frequency signal;
A 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 ambient temperature, which is obtained using the own unit;
Voltage coefficient storage means for storing a voltage coefficient obtained by using its own unit and indicating a change amount of the level of the reception level signal with respect to a unit change of the supply voltage;
Channel coefficient storage means for storing a channel coefficient obtained by using its own unit and indicating a change amount of the level of the reception level signal with respect to a unit channel change;
Based on the ambient temperature detected by the temperature detection means and the temperature coefficient stored in the temperature coefficient storage means, a deviation in the level of the reception level signal accompanying a change in ambient temperature is detected by the voltage detection means. A channel used for transmission of the radio frequency signal, a deviation of the level of the reception level signal accompanying a change in the voltage of the supply power based on a voltage and a voltage coefficient stored in the voltage coefficient storage means; Based on the channel coefficient stored in the channel coefficient storage means, the level difference of the reception level signal corresponding to the channel used for transmission is compensated, and the level of the reception level signal becomes the level of the reception signal. And a reception level signal correction means for correcting the reception level signal so as to satisfy a predetermined relationship. Door. Attenuating means for attenuating the radio frequency signal;
A strong input detecting means for detecting that a predetermined strong input state is present;
An attenuation control means for attenuating the radio frequency signal by the attenuating means when the strong input detecting means detects that the strong input state is present;
3. The radio unit according to claim 2, wherein the reception level signal correction unit corrects the reception level signal in consideration of an attenuation amount by the attenuation unit. Used by being connected to the baseband unit, converting the baseband signal given from this baseband unit into a radio frequency signal and transmitting it by radio, and the radio frequency signal arriving via the radio line as a baseband signal In a wireless unit having at least one of the functions of converting to and giving to the baseband unit,
A wireless unit comprising power control means for performing power control of at least a part of a component circuit that should perform power control for battery saving. The wireless unit according to claim 4, wherein the power control unit performs power control of all the constituent circuits that are to perform power control for battery saving. In a wireless unit that is used by being connected to a baseband unit, a radio frequency signal that has arrived via a wireless line is converted into a baseband signal and given to the baseband unit.
Attenuating means for attenuating the radio frequency signal;
A strong input detecting means for detecting that a predetermined strong input state is present;
A radio unit comprising attenuation control means for attenuating the radio frequency signal by the attenuation means when it is detected by the strong input detection means that the strong input state is established.

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