JP2002353813A - Digital communication unit and communication unit for distribution line carrier using it - Google Patents

Digital communication unit and communication unit for distribution line carrier using it

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Publication number
JP2002353813A
JP2002353813A JP2001153641A JP2001153641A JP2002353813A JP 2002353813 A JP2002353813 A JP 2002353813A JP 2001153641 A JP2001153641 A JP 2001153641A JP 2001153641 A JP2001153641 A JP 2001153641A JP 2002353813 A JP2002353813 A JP 2002353813A
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Japan
Prior art keywords
circuit
signal
amplification
converter
control circuit
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Pending
Application number
JP2001153641A
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Japanese (ja)
Inventor
Hideo Hase
Mutsumi Ishii
睦 石井
英生 長谷
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Mitsubishi Electric Corp
三菱電機株式会社
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Priority to JP2001153641A priority Critical patent/JP2002353813A/en
Publication of JP2002353813A publication Critical patent/JP2002353813A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide a digital communication unit that can decide an amplification factor of an amplifier circuit in a short time and can be used for a distribution line carrier use communication unit adopting the multicarrier communication system and have high reception sensitivity, and to provide the distribution line carrier use communication unit using the communication unit. SOLUTION: The digital communication unit is provided with a 1st control circuit 10a that detects saturation of an analog/digital converter 16 to roughly and tentatively decide an amplification factor of an AGC amplifier circuit 17 and with a 2nd control circuit 10b that extracts a signal generating circuit component, compares its level with a predetermined level and finely controls the gain of the AGC amplifier circuit 17 according to the comparison result. Thus, number of levels of the selectable gain of the AGC amplifier circuit 17 can be increased and the optimum reception sensitivity can quickly be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication apparatus for transmitting and receiving distribution line carrier signals of a plurality of frequencies, using a distribution line as a transmission line.

[0002]

2. Description of the Related Art As a conventional digital communication apparatus, there is a wideband digital receiver (hereinafter referred to as a digital receiver), which is disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-236276. FIG. 8 is a schematic diagram showing the configuration of a conventional digital receiver disclosed in the above publication. Note that the broadband digital receiver referred to here means that a received wideband signal is converted to an A / A signal in an RF band or an IF band as a high frequency signal.
It is a receiver that performs D-conversion and processes after channel separation by digital circuits. Japanese Patent Application No. 61-504791 entitled "Digital Radio Frequency Receiver" discloses such a digital receiver. However, since it is considered that the digital receiver is well known, the description of the publication is omitted.

[0003] As shown in FIG. 8, a digital receiver comprises:
An antenna 31 for receiving a radio wave (RF signal), and an RF bandpass filter (RFBPF) 32 for band limitation
A local signal oscillator 34 and a mixer 33 for frequency-converting the RF signal into an IF signal, and an IF band-pass filter (IFBPF) for band-limiting the IF signal.
36, an AGC amplifier (amplifier controllable amplifier) 37 for amplifying an IF signal, an A / D converter 38 for converting the amplified IF signal (analog received signal) into a digital signal, and separating a desired channel band. Channel separator (CH separation)
39, and a demodulator 41 for demodulating a data signal from the output signal of the channel separator 39.

[0004] In FIG. 8, a received signal received by an antenna 31 is input to an RF bandpass filter 32 and subjected to necessary band limitation. The necessary band here is a bandwidth that the wideband digital receiver can receive,
It is set to match the service band of the system normally used. For example, a PDC 800 MHz mobile phone system has a bandwidth of 16 MHz. This pass band width of the RF band-pass filter 32 is defined as W.

[0005] Next, the received signal subjected to the band limitation by the RF bandpass filter 32 is subjected to frequency conversion and band limitation by the mixer 33, the local oscillator 34 and the IF bandpass filter 35 to become an IF signal. The bandwidth of the IF bandpass filter 35, that is, the bandwidth of the IF signal is RF
W is the same as that of the bandpass filter 32. next,
The IF signal is amplified by an AGC amplifier 37 and then converted to a wideband digital signal by an A / D converter 38. AGC
The amplification factor of the amplifier 37 is feedback-controlled so that the input signal to the A / D converter 38 becomes maximum within a range not exceeding the maximum allowable input level of the A / D converter 38.

As a first problem, in this configuration, for example, when high-level noise is superimposed on the input signal of the A / D converter 38, the amplification factor of the AGC amplifier is reduced, and the A / D converter 38, the level of the frequency signal component used for transmission among the data signals demodulated by the demodulator 41 becomes relatively small with respect to the dynamic range of these signal processing circuits.
Normal reproduction of the transmission signal becomes difficult. A / D converter 38
Is input to the channel separator 39 and is separated into a desired narrow-band (channel band) digital signal. The narrow band (channel band) referred to here is, for example, 25 kHz in a PDC 800 MHz system portable telephone system. The narrow-band (channel band) digital signal separated from the channel is demodulated in the demodulator 41 in accordance with the system modulation system (π / 4QPSK in a PDC 800 MHz mobile phone) to become a data signal.

In recent years, the above-mentioned digital communication device has begun to be used as a technology such as a power line modem for performing communication using an existing power line (distribution line) for reasons such as cost reduction. This technique is disclosed, for example, in Japanese Patent Application Laid-Open No. 2001-111518. In this gazette, from the viewpoint of improving the noise resistance against noise leaking from the power supply circuit of various home appliances, the same data is placed in a plurality of frequency bands, and the influence of noise is avoided by avoiding frequency bands where noise is greatly affected. A multi-carrier communication system capable of performing communication using a frequency band with few frequencies has been proposed. As a second problem, in the case of such a multi-carrier communication system, the data processing time is longer than that of the single-carrier communication system using a single frequency band. With time, it gets longer and longer,
There is a problem that the response speed of the feedback control is too slow.

[0008]

The conventional wideband digital receiver uses an AGC so that the input signal to the A / D converter is maximized without exceeding its maximum allowable input level.
Since the amplification rate of the amplifier is feedback controlled,
For example, when high-level noise is mixed in the input signal of the A / D converter, the input signal level to the A / D converter relatively decreases, and the data signal demodulated by the demodulator is used for transmission. Since the level of the frequency signal component becomes smaller than the dynamic range of the signal processing circuit, there is a problem that it is difficult to normally reproduce the transmission signal.

In order to use the above digital communication device as a communication device for transporting distribution lines, noise leaking from a power supply circuit of various home electric appliances and the like varies unspecified and changes over time. It has been required to determine the amplification factor of the amplifier 7 in a shorter time and in more detail. Furthermore, the same data is placed on multiple frequency bands,
In the case of a multi-carrier communication system capable of performing communication using a frequency band less affected by noise, the data processing time is longer than that of a single carrier communication system using a single frequency band. Shorter times are desirable.

The present invention has been made in order to solve such a problem, and can determine the amplification factor of an amplifier circuit in a short time, and can be used for a communication device for carrying distribution lines of a multicarrier communication system. Another object of the present invention is to provide a digital communication device having high reception sensitivity and a communication device for distribution line transport using the digital communication device.

[0011]

According to the present invention, there is provided a digital communication apparatus comprising: an amplifier circuit for amplifying an analog signal input from an external device at a predetermined carrier frequency; an A / D converter connected to an output side of the amplifier circuit; From the amplifying circuit to the A
The magnitude of the signal input to the / D converter is A / D
A first control circuit for controlling an amplification factor of the amplifying circuit so as to have a predetermined value predetermined with respect to a dynamic range of the D converter, and a frequency component of the carrier frequency from an output signal of the A / D converter. Extract the signal,
A second control circuit is provided for comparing the level of the extracted signal with a predetermined level and controlling the amplification factor of the amplifier circuit based on the result.

The amplification factor of the amplification circuit has a discontinuous value that changes stepwise, and the first control circuit selects one of all amplification factor stages that can be set by the amplification circuit. The amplifier circuit is controlled by a plurality of stages of amplification factors that are not adjacent to each other, and the second control circuit is controlled by an amplification factor selected from all the amplification factors.

When controlling the amplification factor of the amplifier circuit, the first control circuit observes the degree of saturation of the output of the A / D converter, starting from the one with the largest amplification factor, and observes the observation result. Based on this, the amplification factor to be controlled is sequentially shifted to a lower one.

Further, the second control circuit is provided with the A / D
A signal of the component of the carrier frequency is extracted from the Fourier-transformed signal by the FFT circuit that performs a Fourier transform on the digital signal output from the converter, and the magnitude of this signal is compared with a predetermined level based on the result. , And is configured to control the amplification factor of the amplifier circuit.

According to the present invention, there is provided a communication device for conveying a distribution line, comprising: a coupling circuit connected to a distribution line; an amplification circuit for amplifying an analog signal input at a predetermined carrier frequency from the coupling circuit; The amplification is performed so that the magnitude of a signal input from the connected A / D converter and the amplification circuit to the A / D converter becomes a predetermined value predetermined with respect to a dynamic range of the A / D converter. A first control circuit for controlling the amplification of the circuit,
A signal of the frequency component of the carrier frequency is extracted from the output signal of the A / D converter, the level of the extracted signal is compared with a predetermined level, and the amplification factor of the amplifier circuit is determined based on the result. This uses a digital communication device provided with a second control circuit for controlling.

Further, the analog signal delivered to the distribution line has a plurality of frequencies.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a configuration diagram of a digital communication device according to a first embodiment of the present invention. As an example, a communication device for distribution line transport that performs communication using a plurality of frequencies as carrier waves is shown. In FIG. 1, 9
0 is transmission data to be transmitted, and is input from a data processing device (not shown) or the like. Reference numeral 1 denotes a framing circuit which performs a framing process as shown in FIG. 2 on the transmission data 90, and outputs this to the primary modulator 2. Reference numeral 2 denotes a primary modulator for performing modulation by a predetermined method (for example, DBPSK). Reference numeral 3 denotes a tone selector for extracting a signal of a specific (multiple) tone based on a command from the control circuit 10; Fourier transform circuit (IFFT: Inverse Fast Fou
The frequency domain data of the tone signal extracted by the carrier transform is converted into time domain data. 5 is a parallel / serial conversion circuit (P / S), 6 is a digital / analog conversion circuit (D / A), 7 is a coupling circuit for connecting a wireless output circuit to a distribution line, and 8 is a transmission line (distribution line). Reference numeral 10 denotes a control circuit (to be described in detail later), which internally includes a first control circuit 10a and a second control circuit 10b. Framing circuit 1, primary modulator 2, tone selector 3, IFFT4, P
/ S5, D / A6, and the coupling circuit 7 constitute the transmission system 110.

Reference numeral 120 denotes a reception system. Reference numeral 17 denotes an AGC which amplifies the high-frequency signal received from the coupling circuit 7 at an amplification factor (having a stepwise varying discontinuous amplification factor) under the control of the control circuit 10. Amplifier circuit (Auto Gain Control), 16
Is an analog / digital converter (A / D converter), 1
5 is a serial / parallel conversion circuit (S / P), 14 is a fast Fourier transform circuit (FFT).
m) and 13 are tone selectors, 12 is a primary demodulator, and 11 is a deframing circuit, which outputs received data 91 from the framing signal shown in FIG. These are the transmission system 11
Since the operation is the reverse of that of the corresponding part constituting 0, detailed description of each is omitted. Then, the coupling circuit 7, the AGC circuit 17, the A / D16, the S / P15,
The FFT 14, the tone selector 13, the primary demodulator 12, and the deframing circuit 11 constitute a receiving system 120. The coupling circuit 7 belongs to both the transmission system 110 and the reception system 120.

The coupling circuit 7 is composed of, for example, a transformer and a high-pass filter, and transmits and receives a transmitting / receiving section (not shown, for example, a power amplifier circuit connected to the output side of the D / A converter 6) of the communication device. It is connected to the distribution line, which is the path 8, and has a role of passing the distribution line carrier signal while preventing the inflow of the commercial frequency. The AGC circuit 17 inputs a signal voltage as large as possible within the allowable range to the A / D converter 16 irrespective of the level of the distribution line carrier signal including high-frequency noise that has passed through the coupling circuit 7, and extracts a signal component. The AGC circuit is configured by, for example, a plurality of operational amplifiers, and sets the AGC circuit gain by selecting a set of operational amplifiers used for amplification in accordance with an instruction from the control circuit 10. For ease of understanding, FIG. 3 shows a case where an amplifier circuit is formed by combining, for example, four operational amplifiers A, B, C, and D. FIG. 3B shows the circuit.
Switching the switches SA, SB, SC, and SD to the amplifier side respectively indicates that the amplifier is used, and switching to the bypass circuit side indicates that the amplifier is not used. In this case, FIG.
As shown in (a), 2 4 power combinations, that is, 16 combinations of amplification factors are obtained. Here, a combination that does not use any amplifier is counted as one set as gain 1.

FIGS. 4A and 4B are diagrams for explaining the AGC control operation of the circuit of FIG. 1. FIG.
For explanation, a case where there are five input signals of different amplitude levels is shown. As shown in (b), the signal after passing through the AGC circuit 17 has a small signal greatly amplified and a large signal reduced so that the amplitude level is kept within a predetermined substantially constant range (both upper and lower limits). ing. In this way, by inputting the signal after passing through the AGC circuit 17 to the A / D converter 16 as a signal having a fixed range, the dynamic range of the A / D converter 16 can be used effectively.

The tone selector 13 selects tone data of a certain individual frequency component (a plurality of individual frequency components) according to an instruction from the control circuit 10. FIG. 2 shows a configuration of a frame generated by the framing process by the framing circuit 1;
POC field in the frame (Power Line C
It is a figure showing the composition of ommunication Overhead Control Field). The frame shown in FIG. 2 includes: 1) a preamble (1) field which is an area of a signal for carrier detection; 2) a preamble (2) field which is an area of a signal for symbol synchronization; and 3) a predetermined fixed number. A sync code field which is a code area; and 4) an F area which is a signal area indicating the length of the data field.
5) a HouseType which is an area for a house identification code.
(HC) field and 6) POC which is an area of a control command used in the physical layer
And 7) an RS code field which is an area of an error correction code for FT, HC, and POC; and 8) a data field. This frame is generated by the framing circuit 1 and is modulated by the processing described above. Are output to the transmission line 8. In the first embodiment, for example, the preamble (1) is a repetition pattern of the same data over 16 symbol sections, and the preamble (2) is a repetition pattern of inversion data over 16 symbol sections (data is inverted in symbol units). Pattern).

The frame on the transmission line 8 (distribution line) is received by all communication devices (not shown) connected to the transmission line 8, and the control circuit 10 uses an RS (Reed-Solomon) code. Error check is performed to identify the HC, and if the HC matches the own HC, it is determined that the data transmitted on the transmission path is addressed to itself, and R
Error check using S (Reed-Solomon) code /
Make corrections and understand their content. If it does not match the own HC, no operation is performed.

On the other hand, the POC indicates the communication speed (for example,
A 2-bit communication mode field for setting a low-speed mode, a high-speed mode, and the like, and a selectable modulation method (for example,
A 2-bit modulation method field indicating DQPSK, DBPSK, DBPSK + time diversity, etc., a 1-bit command field indicating a control command (normal operation, change operation), a 2-bit subcommand indicating a function of the control command, Setting information of each function (tone group,
An 8-bit command argument indicating the set position)
It is composed of one extended bit, and is used, for example, for performing processing such as movement of a tone and change of a primary modulation method.

Next, the operation will be described. (Transmission Operation) When transmission data 90 is input to the framing circuit 1, it is converted into data to be modulated under the control of the control circuit 10 and input to the primary modulator 2. Primary modulator 2
Performs primary modulation of data under the control of the control circuit 10 and outputs the data to the tone selector 3. The tone selector 3 generates data for each tone under the control of the control circuit 10,
Output to IFFT4. The IFFT 4 performs inverse Fourier transform of the input data to generate data that is synthesized for a plurality of tones. Reference numeral 5 denotes a serial / parallel conversion circuit which converts input serial data into parallel data and inputs the data to a D / A converter. The D / A converter 6 converts the input data and outputs the converted data to the transmission line 8 via the coupling circuit 7.

(Reception operation) When a distribution line carrier signal arrives, a signal voltage of a multi-tone distribution line carrier signal superimposed on the commercial frequency voltage is induced on the transmission line side of the coupling circuit 7 connected to the transmission line 8. Since the distribution line carrier signal has a frequency sufficiently higher than the commercial frequency, it passes through the coupling circuit 7 that blocks the commercial frequency. At this time, high-frequency noise leaking from the power supply circuit of another home electric appliance or the like to the transmission line 8 also passes through the coupling circuit 7 at the same time. The distribution line carrier signal containing high frequency noise that has passed through the coupling circuit 7 is converted into time-series digital data of the input voltage by the AGC circuit 17 and the A / D converter 16. After storing the digital data for a predetermined time, the frequency analysis is performed by the FFT signal processing 14, and only the frequency data used for transmission by the tone selector 13 is led to the primary demodulator 12.

FIG. 5 is a flowchart of the AGC control operation of the present invention. In the initial control by the first control circuit 10a inside the control circuit 10, the AGC circuit 17
The maximum amplification degree (that is, the level X16 in FIG. 3) is set (step S31), and the digital conversion value of the A / D converter 16 is read by the first control circuit 10a (step S32). The first control circuit 10a is an A / D converter 1
Saturation determination (the saturation determination will be described later) is performed using the output value of No. 6 (step S33). If it is saturated, the first control circuit 10a changes the setting of the gain below the gain selected by the first control circuit in the AGC table shown in FIG. 3 (that is, the level X14 in FIG. 3) to the AGC circuit 17. (Step S34), the first control circuit 10a reads the digital conversion value of the A / D converter 16 again (Step S35), and performs the saturation determination (Step S37).

Here, the saturation means A as shown in FIG.
A / D converter 16 occupying all the data converted into / D
Means that the ratio of the data of the maximum value or the minimum value of the dynamic range exceeds a predetermined ratio. In FIG. 6, the solid line is the maximum value (MAX) and the minimum value (MIN) of the dynamic range of the A / D converter 16, and the broken line is A
An input signal to the / D converter 16 and a circle represent output data from the A / D converter 16. First control circuit 10
As for a, the output data is totaled for each size, and if the data that has become MAX or MIN within a predetermined cycle (time) exceeds a predetermined number, it is determined that the data is saturated.

Returning to the description of the flowchart of FIG. 5 again, the AGC processing by the first control circuit 10a uses the AGC table selected by the first control circuit to the end (step S36), A series of AGC controls (steps S34 to S37) are performed until a non-saturation is reached (step S37), and the AGC is provisionally determined (step S61). Here, as shown in the column of the amplification factor selected by the first control circuit in FIG.
And a first control circuit 10a
Are 8 sets out of 16 sets of amplification factors (8 steps X16, X1
4, X12, X10, X8, X6, X4, X2) will be described by way of an example in which the amplification factor is controlled by a selected use table. The use table is not limited to the example shown in FIG. 3 and can be arbitrarily determined in advance by a user or a system developer. As an example, the AGC usage table is (X16,
X14, X12, X10, X8, X6, X4, X2, where the numbers are merely identification codes and do not mean the amplification rate), in the case of eight stages, the AGC control is performed up to seven times in ascending order of the amplification rate. Will be performed. As described above, since the AGC control is performed by the first control circuit 10a with a rough step-by-step amplification factor, the digital output value of the A / D converter 16 can be selected to a large value close to saturation.

After the AGC gain is provisionally determined in step S61, the digital data output from the A / D converter 16 is stored for a certain period of time, and then the FFT signal processing 14 is performed.
And frequency data used for transmission is extracted by the tone selector 13. Then, a vector length is calculated for each of the plurality of extracted frequency components (step S
62). The vector length obtained by this operation is a signal component from which frequency noise other than the signal frequency has been removed.
The reason is that the noise superimposed on the distribution line is often called so-called white noise in which energy is distributed relatively uniformly over a wide frequency band.
This is because it can be eliminated by frequency analysis by the T signal processing 14. (Refer to the signal levels shown in FIGS. 7A and 7B).

The second control circuit 10b compares the vector length obtained by the calculation with a determination reference value (step S6).
3). The criterion value is a preset value, for example, A
90 of the dynamic range in the / D converter 16
% Range (signal level). As a result of the comparison in step S63, if the vector length is larger than the determination reference value, the AGC provisionally determined value is adopted as the AGC determined value (step S64). On the other hand, if the vector length is smaller than the criterion value, the second control circuit 10b sets the amplification factor selectable by the second control circuit in the AGC use table.
A value (amplification factor) one step higher than the AGC provisionally determined value is selected (step S65). For example, the AGC use table by the first control circuit 10a is (X16, X14, X12,
X10, X8, X6, X4, X2), when the AGC provisionally determined value is X10, and when the vector length obtained by the operation is larger than the determination reference value, AGC
The determined value is X10, while the AGC determined value is X11 when smaller.
Becomes

That is, as shown in FIG.
When the actual signal component is small because the input of the converter 16 contains much noise, the first control circuit 10
a plus one step from the AGC tentatively determined value by a,
As shown in FIG. 7B, when there is little noise at the input of the A / D converter 16 and the real signal component is sufficiently large, the AGC provisionally determined value by the first control circuit 10a is finally adopted, and in each case, In this case, amplification that matches the signal level is performed.

As described above, after the rough AGC is provisionally determined by the first control circuit 10a, the second control circuit 10a
b, a two-stage control of comparing the vector length of the signal with the determination reference value for a plurality of signal frequencies and changing the provisional determination value of AGC based on the determination result is performed, so that the number of stages in the AGC use table is large. Nevertheless, it is possible to quickly reach the optimum amplification factor, increase the number of AGC selection cases, easily extract the signal components used for transmission, and improve the maximum receiving sensitivity of the distribution line carrier communication device. Can be obtained.

Further, the control circuit 10 detects the saturation by counting the output data of the A / D converter 16 by the first control circuit 10a and provisionally determines the AGC amplification factor roughly until the provisional determination. After that, the second control circuit 10b extracts only the frequency data used for transmission from the data converted by the A / D converter 16 and calculates the signal vector length by FFT conversion.
Adjustment can be set to the optimum amplification rate in a short period of time, and relatively large frames (such as headers and data portions of almost the same length) such as acknowledgment messages (response messages) and control messages are frequently used. This is particularly effective for a distribution line carrier communication device that travels to and from a location.

AGC by the first control circuit 10a
The use table is defined as (X16, X14, X
12, X10, X8, X6, X4, X2) and successive gains are roughly selected from discrete gains.
C adjustment can be performed. After the provisional determination of AGC by the first control circuit, the second control circuit 10b determines the vector length of the signal and changes the provisionally determined value, so that the final selection level is set finely. Can quickly reach the target value. Further, it is possible to easily obtain the signal component used for the transmission and to obtain the distribution line carrier communication device that improves the maximum reception sensitivity.

Embodiment 2 In the above description, when the vector length of the signal is small (large), the AGC amplification factor is increased by one stage. However, it is needless to say that one stage is required. For example, the amplification factor selected by the first control circuit 10a is set for every three stages, and when there is an interval of two or more stages in the pair of adjacent amplification factors in the AGC use table, the larger the value between the two depending on the vector length, Alternatively, if the smaller one is selected and sorted, the reception sensitivity can be further reduced.

The AGC use table is stored in 10 stages (X
16, X15, X14, X13, X12, X10, X
8, X6, X4, X2), and the amplification factor may be partially (or all 16 steps) continuous. In this case, a continuous amplification factor (for example, X13) is provisionally determined by the first control circuit 10a, and when the amplification factor is increased by one stage by the second control circuit 10b, the amplification factor finally selected is The gain becomes one step larger than the provisionally determined gain (for example, X14). As described above, by using the AGC use table in which the region with the large amplification factor is dense, the condition that the attenuation of the carrier signal is large and the level of the received signal is relatively small with respect to the white noise, for example, the load is directly below. Signal can be received under conditions such as the condition where is connected or the condition where the transport distance is long. In the above description, the operation for determining the signal level for a plurality of signal frequencies is performed by calculating the vector length for the extracted plurality of signal frequencies. Needless to say, the level determination calculation can be changed by the weight of each signal frequency of the communication device for communication.

Also, an example has been described in which the amplification factor of the AGC circuit 17 is provisionally determined such that the analog signal input from the AGC circuit 17 does not saturate within the dynamic range of the A / D converter 16 and becomes maximum. The peak of the input signal may be set so as to occupy a predetermined ratio or more of the dynamic range of the A / D converter 16, that is, without saturating the region indicated by the solid-line hatching in FIG. Also, it has been described that the transmission path 7 is a commercial power line,
It goes without saying that a dedicated communication line may be used.

[0038]

According to the communication apparatus of the present invention, based on the digital signal from the A / D converter, the analog signal input from the amplifier circuit occupies a predetermined ratio or more of the dynamic range of the A / D converter. A first control circuit for roughly tentatively determining an amplification factor; and extracting a signal level of a frequency component used for transmission from a digital signal input from an A / D converter by FFT analysis, and setting this level to a predetermined level. And a second control circuit for finely changing the amplification factor of the amplification circuit based on the result of the comparison, so that the amplification factor of the amplification circuit can be set to the target value in a short time despite the fine control of the amplification factor. And a digital communication device with high reception sensitivity can be obtained.

The first control circuit selects, from all the obtained gain values, at least discrete gains at which the magnitudes of the gains are not continuous, and the second control circuit selects all the gains. Can be selected, so that a value close to the target amplification factor can be reached in a short time, and finally, the value of the amplification factor can be very finely controlled.

Further, the first control circuit outputs (controls) the command to shift the amplification factor of the amplifier circuit from the larger one to the smaller one, so that the amplification factor of the amplifier circuit can be determined in a short time.

Further, there is provided an FFT circuit for performing a Fourier transform of the digital signal output from the A / D converter, and the first control circuit tentatively determines the amplification factor based on the digital signal before the Fourier transform is performed by the FFT circuit. However, since the second control circuit is configured to change the amplification factor based on the signal subjected to the Fourier transform by the FFT circuit, the amplification factor of the amplification circuit can be finely determined in a short time, and the reception sensitivity can be increased.

Since the communication apparatus for conveying distribution lines of the present invention uses the above-described digital communication apparatus and uses a commercial power supply line as a transmission line, it can be used for controlling home electric appliances and the like.

Further, since the frequency of the signal transmitted through the distribution line is plural, stable communication is possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a digital communication device according to a first embodiment of the present invention which communicates at a plurality of frequencies for distribution line conveyance.

FIG. 2 is a diagram illustrating a configuration of a frame of the communication device in FIG. 1;

FIG. 3 is a diagram illustrating a selective combination of amplification factors of an AGC amplifier circuit.

FIG. 4 is a diagram illustrating an example of an AGC control operation of the communication device in FIG. 1;

FIG. 5 is a flowchart of an AGC control operation of the communication device of FIG. 1;

6 is a diagram for explaining a saturation determination operation in the AGC control operation of FIG.

7 is a diagram showing the relationship between the magnitude of noise and the signal level of the communication device of FIG. 1;

FIG. 8 is a schematic configuration diagram showing a configuration of a conventional wideband digital receiver.

[Explanation of symbols]

1 framing circuit, 2 primary modulation circuit, 3 tone selector, 4 IFFT processing, 5 parallel / serial conversion circuit, 6 D / A converter, 7 coupling circuit,
8 distribution line transmission line, 10 control circuit, 10a first control circuit, 10b second control circuit, 11 deframing circuit, 12 primary demodulation circuit, 13 tone selector, 14 FFT processing, 15 serial / parallel conversion circuit, 16 A / D converter, 17 AGC circuit.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5J022 AA01 BA02 BA08 BA10 CC01 CC04 CD02 CF02 5K046 AA03 BA06 BB05 CC06 DD13 DD15 DD25

Claims (6)

    [Claims]
  1. Amplifying circuit for amplifying an analog signal inputted from the outside at a predetermined carrier frequency, an A / D converter connected to an output side of the amplifying circuit, and input from the amplifying circuit to the A / D converter. A first control circuit for controlling an amplification factor of the amplifying circuit so that a magnitude of the signal becomes a predetermined value predetermined with respect to a dynamic range of the A / D converter; A second control circuit that extracts a signal of the frequency component of the carrier frequency from the signal, compares the level of the extracted signal with a predetermined level, and controls the amplification factor of the amplifier circuit based on the result. A digital communication device comprising:
  2. 2. The amplifying circuit has a discontinuous gain that varies stepwise, and the first control circuit is not adjacent to each other selected from all gain stages that can be set by the amplifying circuit. 2. The amplification circuit according to claim 1, wherein the amplification circuit is controlled by a plurality of amplification factors, and the second control circuit is controlled by an amplification factor selected from all the amplification factors.
    A digital communication device according to claim 1.
  3. 3. The first control circuit, when controlling the amplification factor of the amplifier circuit, starts from the one with the larger amplification factor and observes the degree of saturation of the output of the A / D converter. 2. The digital communication device according to claim 1, wherein the amplification factor to be controlled is sequentially shifted to a lower one based on the control signal.
  4. 4. The second control circuit extracts a carrier frequency component signal from a signal Fourier-transformed by an FFT circuit that Fourier-transforms the digital signal output from the A / D converter. The communication according to any one of claims 1 to 3, wherein an amplification factor of the amplification circuit is controlled based on a result of comparing a magnitude of the amplification with a predetermined level. apparatus.
  5. 5. A coupling circuit connected to a distribution line, an amplification circuit for amplifying an analog signal input from the coupling circuit at a predetermined carrier frequency, an A / D converter connected to an output side of the amplification circuit, the amplification A first method of controlling an amplification factor of the amplifier circuit so that a signal input from the circuit to the A / D converter has a predetermined value predetermined with respect to a dynamic range of the A / D converter. A control circuit, extracting a signal of the frequency component of the carrier frequency from an output signal of the A / D converter, comparing the level of the extracted signal with a predetermined level, and based on the result, determining whether the amplification circuit A communication device for transporting distribution lines using a digital communication device having a second control circuit for controlling an amplification factor.
  6. 6. The communication device according to claim 5, wherein the analog signal delivered to the distribution line has a plurality of frequencies.
JP2001153641A 2001-05-23 2001-05-23 Digital communication unit and communication unit for distribution line carrier using it Pending JP2002353813A (en)

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