JP2010206629A - Receiving apparatus, amplitude control method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a receiving apparatus in which a D/A conversion section and related analog components can be deleted. <P>SOLUTION: A reception amplifier 1 amplifies and frequency-converts a received analog signal to generate an output signal. An analog/digital conversion section 2 converts the output signal of the reception amplifier 1 to a digital signal. Meanwhile, a desired digital signal is stored in a reference amplitude memory 52. A comparison control section 51 compares the output of the analog/digital conversion section 2 with the digital signal stored in the reference amplitude memory 52 and outputs difference control information S6 corresponding to the result of the comparison. A level corrector 53 corrects the output of the analog/digital conversion section 2 based on the difference control information S6 to provide a corrected output. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a receiving apparatus, an amplitude control method, and a program used in the field of a mobile phone or the like using a W-CDMA (Wideband Code Division Multiple Access) system.

In general, a W-CDMA receiver performs AGC (Auto Gain Control) so that the received analog input to the A / D converter is constant and the amplitude of the received digital signal becomes a desired value. AGC of this type of receiving apparatus will be described with reference to FIG.
The receiving apparatus shown in this figure includes a reception amplification unit 71, an analog / digital (A / D) conversion unit 72, and a calculation unit 75.
The reception amplification unit 71 amplifies the reception analog signal S71 from the antenna. An analog / digital (A / D) conversion unit 72 converts the output of the reception amplification unit 71 into a reception digital signal S72. The arithmetic unit 75 calculates the difference between the amplitude of the desired digital signal and the amplitude of the received digital signal S 72, and outputs control information S 76 to the digital / analog (D / A) converter 76. The D / A conversion unit 76 converts the control information S76 into an analog signal and outputs it to the variable attenuation unit 73 of the reception amplification unit 71.
The reception amplification unit 71 includes an amplification unit 11, a band pass filter 12, a variable attenuation unit 73, and a frequency conversion unit 13. The calculation unit 75 compares the amplitude of the desired digital signal with the reference amplitude memory unit 752 that stores the amplitude of the desired digital signal in advance, and compares the amplitude difference control information S76 with the D / A conversion unit. And a comparison control unit 751 that outputs to 76.

JP 2000-174623 A JP 2001-245008 A JP 2003-152479 A

  By the way, in the above-described receiving apparatus, the analog signal output from the D / A converter 76 is the variable attenuation unit 73 of the reception amplifying unit 71 in order to perform AGC for correcting the received analog signal S71 to the desired received digital signal S75. There is a problem that the analog parts and the D / A converter 76 cannot be deleted because they are controlled by signals.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a receiving apparatus, an amplitude control method, and a program that can delete a D / A converter and an accompanying analog component. .

  The present invention relates to a reception amplifying unit that amplifies a received analog signal, converts the frequency and outputs the signal, an analog / digital converter that converts the output signal of the reception amplifying unit into a digital signal, and a reference in which a desired digital signal is stored An amplitude memory unit, a comparison control unit that compares an output of the analog / digital converter and a digital signal stored in the reference amplitude memory unit, and outputs difference control information corresponding to a comparison result; and the analog / digital unit A receiving apparatus comprising: a level correcting unit that corrects and outputs the output of the converter based on the difference control information.

  The present invention also relates to an amplitude control method in a receiving apparatus for controlling the amplitude of a received digital signal obtained by analog / digital conversion of a received analog signal by an A / D converter to a predetermined value. A comparison process for comparing the amplitude of the signal with a desired digital signal stored in advance, and a correction process for correcting the amplitude of the received digital signal so that the difference in amplitude detected in the comparison process is minimized. It is the amplitude control method in the receiver characterized by having.

  Further, the present invention provides a program for controlling the amplitude of a received digital signal obtained by analog / digital conversion of the received analog signal by an A / D converter to a predetermined value, and is stored in advance as the received digital signal. Comparison processing for comparing the amplitude with the desired digital signal and detecting the difference, and correction processing for correcting the amplitude of the received digital signal so that the difference in amplitude detected in the comparison processing is minimized It is a program for making it run.

  According to the present invention, the amplitude of the received digital signal is corrected so that the difference between the received digital signal and the desired digital signal stored in advance is minimized. Further, there is an effect that the analog parts and the D / A conversion unit can be deleted.

It is a block diagram which shows the structure of the receiver by one Embodiment of this invention. It is a block diagram which shows the structure of the level correction | amendment part 53 shown in FIG. It is a block diagram which shows the structure of the comparison control part 51 in FIG. It is a figure for demonstrating operation | movement of the level correction | amendment part 53 shown in FIG. It is a figure which shows difference control information S6 output from the comparison control part 51 shown in FIG. It is a figure for demonstrating operation | movement of the calculating part 5 shown in FIG. It is a block diagram which shows the structural example of the conventional receiver.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a receiving apparatus according to an embodiment of the present invention. The receiving apparatus includes a reception amplification unit 1, an analog / digital (A / D) conversion unit 2, and a calculation unit 5.
The reception amplification unit 1 amplifies the reception analog signal S1 from the antenna and outputs the reception analog signal S1a. The analog / digital (A / D) converter 2 converts the received analog signal S1a into a received digital signal S2. The computing unit 5 calculates the difference between the amplitude of the desired digital signal and the amplitude of the received digital signal S2, corrects the received digital signal S2 according to the calculated difference, and outputs the received digital signal S5.

  The reception amplification unit 1 includes an amplification unit 11, a band pass filter 12, and a frequency conversion unit 13. The arithmetic unit 5 includes a reference amplitude memory unit 52 that stores the amplitude of a desired digital signal in advance, a comparison control unit 51 that compares the amplitude of the received digital signal S2 and the desired digital signal, and the amplitude of the received digital signal S2 and the desired value. And a level correction unit 53 that corrects the amplitude difference of the digital signal.

FIG. 2 is a block diagram showing the configuration of the level correction unit 53. The level correction unit 53 includes a bit shift unit 30, bit shift units 31 to 37, switches 40 to 47, and an addition unit 50.
The bit shift unit 30 outputs the received digital signal S2 as it is. The bit shift units 31 to 37 shift the output bits of the input reception digital signal S2 in advance and output the reception digital signal in which the output amplitude value is attenuated with respect to the input amplitude value. The switches 40 to 47 are on / off controlled by the difference control information S6 from the comparison control unit 51. The adder 50 adds the outputs of the bit shifters 30 to 37 input via the switches 40 to 47 controlled to be turned on / off, and outputs the result as one received digital signal S5.

FIG. 3 is a block diagram illustrating a configuration of the comparison control unit 51. The comparison control unit 51 includes an average processing unit 182, a comparator 184, and a control unit 185.
The average processing unit 182 outputs average received power data S31 obtained by accumulating and averaging the input received digital signal S2 for an arbitrary fixed time. The comparator 184 compares the average received power data S31 and the reference power data S32 preset in the reference amplitude memory unit 52, and outputs amplitude information S33 indicating the difference. The control unit 185 outputs 8-bit difference control information S6 based on the amplitude information S33.

Next, the operation of the above receiving apparatus will be described.
The reception analog signal S1 received from the antenna is amplified, band limited, and frequency-converted by the reception amplification unit 1, and converted to the reception digital signal S2 by the A / D conversion unit 2. The received digital signal S2 is input to the arithmetic unit 5, and the arithmetic unit 5 corrects the level of the received digital signal S2 to a received digital signal having a desired amplitude and outputs the received digital signal S5. In the calculation unit 5, the received digital signal S <b> 2 is input to the comparison control unit 51 and the level correction unit 53. The comparison control unit 51 compares a desired digital signal stored in advance in the reference amplitude memory unit 52 with the received digital signal S2, and outputs difference control information S6.

  Next, the operation of the level correction unit 53 shown in FIG. 2 will be described. The bit shift unit 30 outputs the input reception digital signal S1 as it is, and the bit shift units 31 to 37 output the input reception digital signal S1 to 1, 2, 3, 4, 5, 6, 7 bits, respectively. Is shifted to the LSB side and output. The switches 40 to 47 are ON / OFF controlled by the difference control information S6, select the outputs of the bit shift units 30 to 37, and output them to the adder unit 50.

Here, the amplitude value of the received digital signal converted into a digital signal is expressed in binary. When a digit is lowered by one digit, the number is ½ times the current number, and when the digit is incremented by one, the number is twice as large as before. Therefore, the amplitude value represented by binary number, n bits decreases the 1/2 ⁿ times, up n bits becomes an amplitude value of 2 ⁿ times. For example, when the received signal output is corrected and the RF signal output voltage for 2 dB is attenuated (−2 dB), the amplitude ratio is “0.794328234”. When a number of 1 or less is expressed in binary, each digit after the decimal point has a value as shown in FIG. Therefore, when “−2 dB” is expressed in binary, it becomes “0.1100110” as shown in FIG. Therefore, the level correction unit 53 adds the combination of the 1-bit shift unit 31, the 2-bit shift unit 32, the 5-bit shift unit 35, and the 6-bit shift unit 36 in the addition unit 50 in order to correct the received digital signal. That's fine. Here, the number of output bits of the adding unit 50 is set to a number of bits larger by 2 bits or more than the maximum amplitude value of the input baseband signal.

  FIG. 5 shows combinations of the switch units 40 to 47 with respect to the correction values set by the level correction unit 53. The bit shift units 30 to 37 input to the adding unit 50 are selected by the control of the switch units 40 to 47, and the output of the adding unit 50 becomes the corrected received digital signal S5. Here, the level correction value to be set is expressed as an ideal dB value, and a value obtained by comparing the ideal dB value as a ratio is expressed as a true value. The correction value actually set by the level correction unit 53 is set as an approximate dB value. For example, the correction value “−2 dB” can be realized as a value of “−1.972 dB” as an approximate dB value. As the number of bit shift units increases, the error between the ideal dB value and the approximate dB value decreases. However, even when there are seven bit shift units, this error is small enough to cause no practical problem. .

  Here, correction when the level correction value “ΔαdB” of the amplitude of the reception level signal S2 shown in FIG. 6A is “−0.8 dB” will be described. Difference control information S6 for setting the level correction value “−0.8 dB” is output from the control unit 185 of the comparison control unit 51 of FIG. In the control unit 185, combinations of the switches 40 to 47 with respect to the level correction values shown in FIG. 5 are set in advance. In this case, “01110101” is output as the difference control information S6. With this difference control information S6, the switches 41, 42, 43, 45, 47 of the level correction unit 53 in FIG. 2 are turned on. Accordingly, the amplitude of the received digital signal S5 output from the adder 50 is output as a value obtained by adding digital signals obtained by multiplying the input signal by 1/2, 1/4, 1/8, 1/32, or 1/64. The Since the reception digital signal S5 output from the level correction unit 53 is attenuated by “−0.8 dB” with respect to the amplitude of the input reception digital signal S2, the reception digital signal S5 has a desired reception amplitude.

  Similarly, correction when the amplitude level correction value “Δβ dB” shown in FIG. 6B is “+1.2 dB” will be described. In this case, the comparison control unit 51 outputs “10010011” as the difference control information S6. With this difference control information S6, the switches 40, 43, 46, 47 of the level correction unit 53 in FIG. 2 are turned on. Therefore, the amplitude of the received digital signal S5 output from the adder 50 is output as a value obtained by adding digital signals obtained by multiplying the input signal by 1, 1/8, 1/64, or 1/128. Since the reception digital signal S5 output from the level correction unit 53 is increased by “+1.2 dB” with respect to the amplitude of the input reception digital signal S2, the reception digital signal S5 has a desired reception amplitude.

Next, the operation of the comparison control unit 51 will be described with reference to FIG. The received digital signal S2 and the reference power data S32 preset in the reference amplitude memory unit 52 are respectively input to the comparison control unit 51, and the received digital signal S2 is output from the average processing unit 182 as the average received power data S31. The average received power data S31 and the reference power data S32 are input to the comparator 184. The comparator 184 converts the difference in amplitude between the digital signals of the average received power data S31 and the reference power data S32 into a received power level according to a certain reference, and outputs it as amplitude information S33. The control unit 185 outputs difference control information S6 corresponding to the amplitude difference obtained from the amplitude information S33 to the level correction unit 53.
Although the above embodiment is a case where the receiving device is configured by hardware, it is of course possible to configure the receiving device according to the present invention using a microprocessor.
In this case, a microprocessor is used in place of the level correction unit 53 and the comparison control unit 51 of FIG. The microprocessor compares the amplitude of the received digital signal S2 with a desired digital signal stored in advance in the reference amplitude memory unit 51 to detect a difference, and the difference in amplitude detected in the comparison process. Correction processing is performed to correct the amplitude of the received digital signal S2 so as to be minimized.

  The present invention is used in the field of mobile phones using W-CDMA (Wideband Code Division Multiple Access). Furthermore, the present invention can be applied to a receiving apparatus, an amplitude control method, and a program to which AGC control will be applied in the future.

DESCRIPTION OF SYMBOLS 1 ... Reception amplification part 2 ... A / D conversion part 5 ... Operation part 30-37 ... Bit shift part 40-47 ... Switch 50 ... Adder 51 ... Comparison control part 52 ... Reference amplitude memory part 53 ... Level correction part 182 ... Average processing unit 184 ... Comparator 185 ... Control unit

Claims (7)

A reception amplification unit that amplifies the reception analog signal, converts the frequency and outputs it;
An analog / digital converter that converts an output signal of the reception amplification unit into a digital signal;
A reference amplitude memory unit in which a desired digital signal is stored;
A comparison control unit that compares the output of the analog / digital converter with a digital signal stored in the reference amplitude memory unit and outputs difference control information corresponding to a comparison result;
A level correction unit for correcting and outputting the output of the analog / digital converter based on the difference control information;
A receiving apparatus comprising: The level correction unit
A plurality of bit shift units for bit shifting the output of the analog / digital converter;
Control means for controlling on / off of the output of each bit shift unit according to the difference control information;
An adder for adding the outputs of the control means;
The receiving apparatus according to claim 1, comprising: The comparison control unit receives an output of the analog / digital converter and outputs average received power data indicating average received power; and
A comparator that outputs difference data indicating a difference between the average received power data and output data of the reference amplitude memory unit;
A control unit that outputs difference control information corresponding to the difference data to the level correction unit;
The receiving apparatus according to claim 1, wherein the receiving apparatus comprises: In an amplitude control method in a receiving apparatus for controlling the amplitude of a received digital signal obtained by analog / digital conversion of a received analog signal by an A / D converter to a predetermined value,
A comparison process for comparing the amplitude of the received digital signal with a desired digital signal stored in advance;
Correction processing for correcting the amplitude of the received digital signal so that the difference in amplitude detected in the comparison processing is minimized;
An amplitude control method in a receiving apparatus, comprising:   5. The reception according to claim 4, wherein the comparison processing obtains average received power data indicating average received power from the received digital signal, and compares the average received power data with the desired digital signal. Amplitude control method in apparatus.   6. The correction process according to claim 4, wherein the received digital signal is bit-shifted a plurality of times according to the result of the comparison process, and the result is added to obtain a corrected digital signal. An amplitude control method in the receiving apparatus according to the above. In a program for controlling the amplitude of a received digital signal obtained by analog / digital conversion of a received analog signal by an A / D converter to a predetermined value,
A comparison process for comparing the received digital signal with a desired digital signal stored in advance and detecting a difference;
Correction processing for correcting the amplitude of the received digital signal so that the difference in amplitude detected in the comparison processing is minimized;
A program that causes a computer to execute.

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