CN203788281U - Power line carrier signal demodulation circuit and microcontroller - Google Patents
Power line carrier signal demodulation circuit and microcontroller Download PDFInfo
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- CN203788281U CN203788281U CN201420164442.5U CN201420164442U CN203788281U CN 203788281 U CN203788281 U CN 203788281U CN 201420164442 U CN201420164442 U CN 201420164442U CN 203788281 U CN203788281 U CN 203788281U
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Abstract
The utility model provides a power line carrier signal demodulation circuit and a microcontroller. The power line carrier signal demodulation circuit comprises a processing module, a filtering module and a demodulation module. The filtering module comprises a first fixed low-pass filtering unit and a first adjustable low-pass filtering unit. The processing module is connected with the first fixed low-pass filtering unit and used for processing a carrier signal so that a frequency mixing signal is generated and outputted to the first fixed low-pass filtering unit. Filtering is performed on the frequency mixing signal by the first fixed low-pass filtering unit and then the frequency mixing signal is outputted to the first adjustable low-pass filtering unit which is connected with the demodulation module. Filtering performed on the frequency mixing signal by the first adjustable low-pass filtering unit and then the frequency mixing signal is outputted to the demodulation module. Corresponding demodulation signals are generated by the demodulation module according to different demodulation modes. Parameters of the demodulation circuit are configurable so that demodulation processing can be performed on the carrier signals with different bandwidth and different frequencies.
Description
Technical field
The utility model relates to power line communication field, relates in particular to a kind of demodulator circuit and microcontroller of power line carrier signal.
Background technology
Power line communication (Power Line Communication, abbreviation PLC) technology refers to the technology of utilizing power line to communicate, during reception, utilize dedicated modem to carry out demodulation to carrier signal, during transmission, the signal coupling after modulation is transmitted to power line.For low-voltage network, many emerging digital technologies, as spread spectrum technic, Digital Signal Processing and Computer Control Technology etc., greatly improve and improved availability and the reliability of the PLC of low-voltage network, thereby make PLC technology there is more tempting application prospect.FCC's (Federal Communications Commission is called for short FCC) has stipulated that the frequency band of the carrier signal that power line transmits is 100kHz～450kHz; The Europe electrical standard committee has also stipulated that the frequency band of the carrier signal that power line transmits is 3kHz～500kHz.Along with the extensive use of PLC technology, also make numerous manufacturers in frequency band range, design the communication products of various frequency band carriers signals, its frequency has 120kHz, 131.5kHz, 410kHz etc.
Yet current existing communication products, can only process the carrier signal of fixed-bandwidth mostly.Existing communication product cannot be for different bandwidth, different frequency, and the carrier signal of different modulating mode is processed, and the lifting of its performance is restricted, and cannot meet the demand that adaptive demodulation filtering is processed.
Utility model content
The utility model provides a kind of demodulator circuit and microcontroller of power line carrier signal, the problem that cannot process the carrier signal of different bandwidth, different frequency to solve prior art.
The utility model provides a kind of demodulator circuit of power line carrier signal, comprising: processing module, filtration module and demodulation module; Wherein, described filtration module comprises: the first fixedly low-pass filter unit, the first adjustable lowpass filter unit; Described first fixedly low-pass filter unit be connected with described the first adjustable lowpass filter unit;
Described processing module, by described first fixedly low-pass filter unit be connected with described filtration module, for the carrier signal receiving is processed, to generate mixed frequency signal, and export described mixed frequency signal to described first fixing low-pass filter unit;
Described filtration module, is connected with described demodulation module by described the first adjustable lowpass filter unit; The described first fixing low-pass filter unit, for described mixed frequency signal is carried out to filtering, and by described first fixedly the signal of low-pass filter unit output export described the first adjustable lowpass filter unit to; Described the first adjustable lowpass filter unit, for the described first signal that fixedly low-pass filter unit is exported is carried out to filtering, and exports the signal of described the first adjustable lowpass filter unit output to described demodulation module;
Described demodulation module, for according to different demodulation modes, the signal of described the first adjustable lowpass filter unit output being generated to corresponding restituted signal, and exports described restituted signal.
Further, in scheme, described processing module, comprising as mentioned above: numerical control oscillating unit and the first mixing unit;
Described numerical control oscillating unit, for generation of and export the first local orthogonal signalling and the second local orthogonal signalling;
Described the first mixing unit, comprises the first frequency mixer and the second frequency mixer; Wherein, described the first frequency mixer is connected with described numerical control oscillating unit, for described carrier signal and described the first local orthogonal signalling are multiplied each other, obtains the first mixed frequency signal; Described the second frequency mixer is connected with described numerical control oscillating unit, for described carrier signal and described the second local orthogonal signalling are multiplied each other, obtains the second mixed frequency signal;
Described the first frequency mixer and described the second frequency mixer, also by described first fixedly low-pass filter unit be connected with described filtration module, for described the first mixed frequency signal and described the second mixed frequency signal are transferred to described filtration module;
Corresponding, the described first fixing low-pass filter unit, also for described the first mixed frequency signal and described the second mixed frequency signal are carried out respectively to filtering, and exports the described first signal that fixedly low-pass filter unit is exported to described the first adjustable lowpass filter unit; Described the first adjustable lowpass filter unit, also for to described first fixedly the signal of low-pass filter unit output carry out filtering, and export in-phase signal and orthogonal signalling to described demodulation module.
Further, in scheme, described filtration module, also comprises as mentioned above: the first down-sampled unit;
Described the first down-sampled unit, fixedly low-pass filter unit and described the first adjustable lowpass filter unit are connected with described first, down-sampled for the described first signal that fixedly low-pass filter unit is exported is carried out, and export extremely described the first adjustable lowpass filter unit of the first low-frequency sampling signal and the second low-frequency sampling signal;
Corresponding, described the first adjustable lowpass filter unit, also for: described the first low-frequency sampling signal and the second low-frequency sampling signal are carried out to filtering, and export described in-phase signal and described orthogonal signalling to described demodulation module.
Further, in scheme, described demodulation module, comprising as mentioned above: delay cell, the second mixing unit, frequency displacement demodulating unit, the second adjustable lowpass filter unit, the second down-sampled unit and second be low-pass filter unit fixedly; Described delay cell comprises the first delayer and the second delayer; Described the second mixing unit comprises three-mixer and the 4th frequency mixer; Described frequency displacement demodulating unit, comprises subtracter;
Described the first delayer, is connected with described three-mixer, for the described in-phase signal that described demodulation module is received, postpones, and obtains and postpones in-phase signal, and export described delay in-phase signal to described three-mixer;
Described the second delayer, is connected with described the 4th frequency mixer, for the described orthogonal signalling that described demodulation module is received, postpones, and obtains and postpones orthogonal signalling, and export described delay orthogonal signalling to described the 4th frequency mixer;
Described three-mixer, is connected with described subtracter, for according to described delay in-phase signal and described orthogonal signalling, produces homophase crossbar signal, and exports described homophase crossbar signal to described subtracter;
Described the 4th frequency mixer, is connected with described subtracter, for according to described delay orthogonal signalling and described in-phase signal, produces orthogonal crossover signal, and exports described orthogonal crossover signal to described subtracter;
Described subtracter, for by described homophase crossbar signal and described orthogonal crossover signal subtraction, obtains the first restituted signal, and exports described the first restituted signal to described the second adjustable lowpass filter unit;
Described the second adjustable lowpass filter unit, is connected with described frequency displacement demodulating unit by described subtracter, for described the first restituted signal is carried out to filtering, and exports the signal of described the second adjustable lowpass filter unit output to described the second down-sampled unit;
Described the second down-sampled unit, with described the second adjustable lowpass filter unit and described second fixedly low-pass filter unit be connected, down-sampled for the signal of described the second adjustable lowpass filter unit output is carried out, and export the signal of described the second down-sampled unit output to described second fixing low-pass filter unit;
The described second fixing low-pass filter unit, for the signal of described the second down-sampled unit output is carried out to filtering, obtains the second restituted signal, and exports described the second restituted signal as frequency shift keying fsk restituted signal.
Optionally, in scheme, described demodulation module, comprising as mentioned above: the 3rd adjustable lowpass filter unit, the 3rd mixing unit, loop tracing unit;
Described the 3rd adjustable lowpass filter unit, carries out respectively filtering for described in-phase signal and described orthogonal signalling that described demodulation module is received, and exports the signal of described the 3rd adjustable lowpass filter unit output to described the 3rd mixing unit;
Described the 3rd mixing unit, is connected with described the 3rd adjustable lowpass filter unit, for the signal of described the 3rd adjustable lowpass filter unit output is multiplied each other, obtains the 3rd mixed frequency signal, and exports described loop tracing unit to;
Described loop tracing unit, be connected with described the 3rd mixing unit and described numerical control oscillating unit, for obtaining the phase information of described the 3rd mixed frequency signal, and according to described phase information, described numerical control oscillating unit is configured, so that described the 3rd adjustable lowpass filter unit obtains the 3rd restituted signal, and export described the 3rd restituted signal as phase shift keying PSK restituted signal.
Optionally, in scheme, described demodulation module, comprising as mentioned above: the 4th adjustable lowpass filter unit, differential phase shift demodulating unit, the 5th adjustable lowpass filter unit;
Described the 4th adjustable lowpass filter unit, be connected with described the first adjustable lowpass filter unit, for described in-phase signal and described orthogonal signalling are carried out to filtering, and export the signal of described the 4th adjustable lowpass filter unit output to described differential phase shift demodulating unit;
Described differential phase shift demodulating unit, be connected with described the 5th adjustable lowpass filter unit, for the signal of described the 4th adjustable lowpass filter unit output is carried out to differential phase shift processing, and export the signal of described differential phase shift demodulating unit output to described the 5th adjustable lowpass filter unit;
Described the 5th adjustable lowpass filter unit, carries out filtering to the signal of described differential phase shift demodulating unit output, obtains the 4th restituted signal, and exports described the 4th restituted signal as differential phase keying (DPSK) DPSK restituted signal.
The utility model also provides a kind of microcontroller, comprising: input port, output port and as above arbitrary described demodulator circuit;
Described input port, the carrier signal of inputting for receiving ancillary equipment, and described carrier signal is transferred to described demodulator circuit;
Described output port, exports to described ancillary equipment for the restituted signal that described demodulator circuit is exported afterwards through algorithm process.
Demodulator circuit and the microcontroller of the power line carrier signal that the utility model provides, because fixing low-pass filter unit coordinates enforcement with adjustable lowpass filter unit, because this adjustable lowpass filtering parameter can carry out flexible configuration, make the parameter of this demodulator circuit configurable, thereby make this demodulator circuit carry out demodulation process to the carrier signal of different bandwidth.
Accompanying drawing explanation
The structural representation of the demodulator circuit of the power line carrier signal that Fig. 1 provides for the utility model embodiment mono-;
The structural representation of the demodulator circuit of the power line carrier signal that Fig. 2 provides for the utility model embodiment bis-;
The structural representation of the FSK demodulator circuit that Fig. 3 provides for the utility model embodiment tri-;
Fig. 4 is for the demodulator circuit that adopts the utility model embodiment tri-and provide and adopt existing demodulator circuit to carry out the anti-arrowband error rate contrast figure of demodulation;
Fig. 5 is for the demodulator circuit that adopts the utility model embodiment tri-and provide and adopt existing demodulator circuit to carry out the anti-white noise error rate contrast figure of demodulation;
The structural representation of the PSK demodulator circuit that Fig. 6 provides for the utility model embodiment tetra-;
The structural representation of the DPSK demodulator circuit that Fig. 7 provides for the utility model embodiment five;
The structural representation of the microcontroller that Fig. 8 provides for the utility model embodiment six.
Embodiment
Embodiment mono-
The structural representation of the demodulator circuit of the power line carrier signal that Fig. 1 provides for the utility model embodiment mono-.As shown in Figure 1, this demodulator circuit 101 comprises: processing module 102, filtration module 103 and demodulation module 104; Wherein, filtration module 103 comprises: the first fixedly low-pass filter unit 105 and the first adjustable lowpass filter unit 106.
Processing module 102, by first fixedly low-pass filter unit 105 be connected with filtration module 103, for the carrier signal receiving is processed, to generate mixed frequency signal, and export this mixed frequency signal to first fixing low-pass filter unit 105.
Filtration module 103, is connected with demodulation module 104 by the first adjustable lowpass filter unit 106; The first fixing low-pass filter unit 105, for this mixed frequency signal is carried out to filtering, and by this first fixedly signal of low-pass filter unit 105 outputs export the first adjustable lowpass filter unit 106 to; The first adjustable lowpass filter unit 106, for this first signal that fixedly low-pass filter unit 105 is exported is carried out to filtering, and exports the signal of the first adjustable lowpass filter unit 106 outputs to demodulation module 104.
Demodulation module 104, for according to different demodulation modes, the signal of the first adjustable lowpass filter unit 106 outputs being generated to corresponding restituted signal, and exports this restituted signal.
In the present embodiment this first fixedly low-pass filter unit specifically can comprise fixed low-pass filters (Low Pass Filter, be called for short LPF) LPF, the actual fixing LPF of filter factor that refers to of this fixed L PF, different fixed L PF has different filtering parameters, as frequency filtering.This first fixedly the filtering parameter of low-pass filter unit can be to select corresponding fixed L PF according to this carrier signal.
This embodiment scheme is before the first adjustable lowpass filter unit carries out filtering, first by this first fixedly low-pass filter unit carry out elementary filtering, signal with upper frequency in this mixed frequency signal of filtering, in wananty costs, can guarantee more stability of signal that this first adjustable lowpass filter unit carries out filtering, so that the stability of this demodulator circuit is higher.
It should be noted that, in the present embodiment, this first fixing filtering parameter of low-pass filter unit, is preferably 500KHz.When this is first when fixedly the bandwidth of low-pass filter unit is 500KHz, the frequency of the restituted signal that this demodulator circuit is exported is below 500KHz.
The first adjustable lowpass filter unit 106 specifically comprises adjustable LPF, this is adjustable actual adjustable LPF of this filter factor that refers to of LFP.Filtering parameter due to this adjustable LPF, as the centre frequency of filter, the mixed frequency signal generating after can processing according to carrier signal or by this processing module is set, thereby the filtering parameter of this first adjustable lowpass filter unit can be presetted, the mixed frequency signal generating after can processing processing module carries out adjustable filtering, and be not only limited to, can not carry out filtering to the signal of fixed frequency.Because the filtering operation of this first adjustable lowpass filter unit is not limited to the signal of fixed frequency, thereby make this demodulator circuit can be by regulating the frequency filtering of this first adjustable lowpass filter unit to carry out demodulation process to the carrier signal of different bandwidth and different frequency.Wherein, this demodulation module can be according to different demodulation modes, as frequency shift keying (Frequency Shift Keying, abbreviation FSK), phase shift keying (Phase Shift Keying, be called for short PSK) and differential phase keying (DPSK) (Differential Phase Shift Keying is called for short DPSK) etc. the signal after the first adjustable lowpass filtering unit filters is adjusted.Wherein, the debud mode of this demodulation module can be according to user, the different demands of restituted signal to be selected.
Filtering parameter due to this first adjustable lowpass filter unit in the present embodiment can carry out flexible configuration, makes the parameter of this demodulator circuit configurable, thereby makes this demodulator circuit carry out demodulation process to the carrier signal of different bandwidth.
Simultaneously, due to this first can regulated filtering unit the flexible configuration of filtering parameter, can be on the basis not changing at this demodulator circuit, the bandwidth of this demodulator circuit is carried out to flexible configuration, thereby can effectively improve stopband attenuation, also can realize the signal gain of this demodulator circuit in corresponding bandwidth adjustable simultaneously, according to different code speed, require to adopt the filter of different bandwidth, elevator system sensitivity and anti-Gauss's white noise performance, thereby the transmission demand of the PLC carrier signal of adaptation different frequency.And, due to this first can regulated filtering unit the flexible configuration of filtering parameter, the processing bandwidth of this demodulator circuit changes flexibly, makes this demodulator circuit can adopt for the carrier signal of different bandwidth different code speed to process, thereby the demodulator circuit of different code speed is provided.This tunable filter can also be realized the flexible configuration of transition band and stopband attenuation, to meet the demand of power line noise environmental change, the communication performance of the anti-attenuation outside a channel of elevator system.
Owing to first also comprising the first fixing low pass unit before can regulated filtering unit at this, by first fixedly low-pass filter unit first carry out filtering, can improve the filtering performance of this demodulator circuit, can reduce by reducing the exponent number of the filter of this first adjustable lowpass filter unit the hardware cost of this demodulator circuit simultaneously.
Embodiment bis-
The present embodiment also provides a kind of demodulator circuit of power line carrier signal.The structural representation of the demodulator circuit of the power line carrier signal that Fig. 2 provides for the utility model embodiment bis-.As shown in Figure 2, this demodulator circuit 201 is on the basis of scheme described in above-described embodiment, and wherein processing module 102 specifically comprises: numerical control oscillating unit 202 and the first mixing unit 203;
Numerical control oscillating unit 202, for generation of and export the first local orthogonal signalling and the second local orthogonal signalling.Particularly, this numerical control oscillating unit can be digital controlled oscillator (Numerical Controlled Oscillator, be called for short NCO), these first local orthogonal signalling can be the cosine signals that this NCO produces, these second local orthogonal signalling can be the sinusoidal signals that this NCO produces.
The first mixing unit 203, comprises the first frequency mixer 204 and the second frequency mixer 205; Wherein, the first frequency mixer 204 is connected with numerical control oscillating unit 203, for this carrier signal and this this locality in-phase signal are multiplied each other, obtains the first mixed frequency signal; The second frequency mixer 205 is connected with numerical control oscillating unit 203, for this carrier signal and this this locality orthogonal signalling are multiplied each other, obtains the second mixed frequency signal.Particularly, this first frequency mixer 204 and this second frequency mixer 205 can be multipliers.
The first frequency mixer 204 second frequency mixers 205, also by this first fixedly low-pass filter unit 105 be connected with filtration module 103, for the first mixed frequency signal and this second mixed frequency signal are transferred to filtration module 103.
Corresponding, the first fixing low-pass filter unit 105, also for this first mixed frequency signal and this second mixed frequency signal are carried out respectively to filtering, and exports the first signal that fixedly low-pass filter unit 105 is exported to first adjustable lowpass filter unit 106; The first adjustable lowpass filter unit 106, also for to first fixedly the signal of low-pass filter unit 105 output carry out filtering, and export homophase (In-phase is called for short I) signal and quadrature (Quadrature is called for short Q) signal to demodulation module 104.
Particularly, this first fixedly low-pass filter unit 105 can carry out respectively filtering to this first mixed frequency signal and this second mixed frequency signal, so this first fixedly low-pass filter unit 105 at least comprise one group of fixed L PF, this group of fixed L PF comprises the first fixed L PF206 and the second fixed L PF207.Wherein, this first fixed L PF206 can carry out filtering to this first mixed frequency signal, and this second fixed L PF207 can be to this second mixed frequency signal.This first fixed L PF206 and the 2nd LPF207 can have identical filtering parameter, that is to say that this first fixed L PF and the 2nd LPF can be the LPF of same model.
The first adjustable lowpass filter unit 106 can comprise one group of adjustable LPF, and this group of adjustable LPF comprises the first adjustable LPF208 and the second adjustable LPF209.This first adjustable LPF208 can carry out filtering again to the signal after this first fixed L filtering that PF206 carries out, and output I signal is to demodulation module 104; This second adjustable LPF209 can carry out filtering again to the signal after this second fixed L filtering that PF207 carries out, and output Q signal is to demodulation module 104.
Further, on the basis of such scheme, filtration module 103 also comprises: the first down-sampled unit 210;
The first down-sampled unit 210, fixedly low-pass filter unit 105 and the first adjustable lowpass filter unit 106 are connected with first, down-sampled for the first signal that fixedly low-pass filter unit 105 is exported is carried out, and export the first low-frequency sampling signal and the second low-frequency sampling signal to the first adjustable lowpass filter unit 106;
Corresponding, the first adjustable lowpass filter unit 106, also for: this first low-frequency sampling signal and the second low-frequency sampling signal are carried out to filtering, and export I signal and Q signal to demodulation module 104.
Particularly, this first down-sampled unit 210 also can comprise one group of decimator, and this group of decimator can comprise the first decimator 211 and the second decimator 212.Wherein the first decimator 211 is connected with the first fixed L PF206 and the first adjustable LPF208, for the first fixed L PF206 being carried out to signal after filtering, carries out down-sampledly, and exports the adjustable LPF208 of the first low-frequency sampling signal to the first; The second decimator 212 is connected with the second fixed L PF207 and the second adjustable LPF209, down-sampled for the signal of the second fixed L PF207 output is carried out, and exports the adjustable LPF209 of the second low-frequency sampling signal to the second.
This first down-sampled unit can carry out down-sampled to this first signal that fixedly low-pass filter unit is exported, thereby reduce the signal frequency that this first adjustable lowpass filter unit carries out filtering, for example can by the signal of 2MHz down-sampled be the signal of 250KHz, thereby reduced the exponent number of the filter of this first adjustable lowpass filter unit, thereby reduced the circuit area of this demodulator circuit, reduced the hardware cost of this demodulator circuit.
The present embodiment scheme is on the basis of above-described embodiment, by this first down-sampled unit, at the first signal that fixedly low-pass filter unit is exported, carry out down-sampled, can reduce the exponent number of the filter of this first adjustable lowpass filter unit, reduce the area of this demodulator circuit; By numerical control oscillating unit, be combined with the first adjustable lowpass filter unit, the carrier signal of arbitrary frequency can be mixed to baseband signal, the arbitrary continuation of realizing carrier signal centre frequency is adjustable, also can realize frequency hopping transmission.
Embodiment tri-
The present embodiment, on the basis of above-described embodiment two schemes, is explained to the demodulator circuit of power line carrier signal by the implementation of FSK demodulator circuit.The structural representation of the FSK demodulator circuit that Fig. 3 provides for the utility model embodiment tri-.As shown in Figure 3, in such scheme, demodulation module 104 comprises: delay cell 301, the second mixing unit 302, frequency displacement demodulating unit 303, the second down-sampled unit 305 of adjustable lowpass filter unit 304, second and second be low-pass filter unit 306 fixedly; Wherein, delay cell 301 comprises the first delayer 307 and the second delayer 308; The second mixing unit 302 comprises three-mixer 309 and the 4th frequency mixer 310; Frequency displacement demodulating unit 303, comprises subtracter 311.
The first delayer 307, is connected with three-mixer 309, for this in-phase signal that demodulation module 104 is received, postpones, and obtains and postpones in-phase signal, and export this delay in-phase signal to three-mixer 309.
The second delayer 308, is connected with the 4th frequency mixer 310, for these orthogonal signalling that demodulation module 104 is received, postpones, and obtains and postpones orthogonal signalling, and export these delay orthogonal signalling to the 4th frequency mixer 310.
Three-mixer 309, is connected with subtracter 311, for postponing in-phase signal and this orthogonal signalling according to this, produces homophase crossbar signal, and exports this homophase crossbar signal to subtracter 311.
The 4th frequency mixer 310, is connected with subtracter 311, for postponing orthogonal signalling and this in-phase signal according to this, produces orthogonal crossover signal, and exports this orthogonal crossover signal to subtracter 311.
Subtracter 311, for by this homophase crossbar signal and this orthogonal crossover signal subtraction, obtains the first restituted signal, and exports this first restituted signal to second adjustable lowpass filter unit 304.
The second adjustable lowpass filter unit 304, is connected with frequency displacement demodulating unit 303 by subtracter 311, for this first restituted signal is carried out to filtering, and exports the signal of this second adjustable lowpass filter unit output to second down-sampled unit 305.
The second down-sampled unit 305, with the second adjustable lowpass filter unit 304 and second fixedly low-pass filter unit 306 be connected, down-sampled for the signal of this second adjustable lowpass filter unit output is carried out, and export the signal of this second down-sampled unit output to second fixing low-pass filter unit 306.
The second fixing low-pass filter unit 306, for the signal of this second down-sampled unit output is carried out to filtering, obtains the second restituted signal, and exports this second restituted signal as frequency shift keying fsk restituted signal.
This second adjustable lowpass filter unit 304 can comprise an adjustable LPF, i.e. the 3rd adjustable LPF312, and as shown in Figure 3, this second adjustable lowpass filter unit 304 can be connected with subtracter 311 by the 3rd adjustable LPF312; This second down-sampled unit 305 can comprise a decimator, i.e. the 3rd decimator 313, this second down-sampled unit 305 by the 3rd decimator 313 and the second adjustable lowpass filter unit 304 with second fixedly low-pass filter unit 306 be connected; This second fixedly low-pass filter unit 306 can comprise a fixed L PF, i.e. the 3rd fixed L PF314, this second fixedly low-pass filter unit 306 by the 3rd fixed L PF314, be connected with the second down-sampled unit 305.
The present embodiment is on the basis of above-described embodiment scheme, a kind of FSK demodulator circuit is provided, and this FSK demodulator circuit can carry out FSK demodulation to the carrier signal of different bandwidth, thereby exports corresponding FSK restituted signal, its concrete beneficial effect is similar to the above embodiments, does not repeat them here.
In order to adopt the utility model embodiment tri-, the demodulator circuit providing and the anti-arrowband that adopts existing demodulator circuit to carry out demodulation disturb error rate contrast figure to Fig. 4.As shown in Figure 4, abscissa is the frequency that adds disturbance signal, the error rate that vertical coordinate is receiver (Bit Error Rate is called for short BER), and the narrow band signal of this interpolation is 1:1.4 with the ratio of the carrier signal energy of this 270KHz.Wherein curve 2 is new270fsk, while referring to center frequency point 270KHz, to different simple signals, adopts the narrowband demodulation circuit after regulating to carry out demodulation; Curve 1 is old270fsk, while referring to center frequency point 270KHz, to different simple signals, adopts the fixedly FSK demodulation of filtering to carry out demodulation.In carrying out demodulating process, add respectively same band, the arrowband of 5KHz～5.5KHz disturbs.Adopt the demodulator circuit that this embodiment provides to carry out signal solution timing, the processing bandwidth of its adjustable lowpass filter unit can be adjusted to narrow bandwidth.If when the processing bandwidth of adjustable lowpass filter unit is adjusted to narrow bandwidth, as known in curve in Fig. 41 and 2, no matter add the single-frequency interference signal of what frequency, its error rate of FSK demodulation scheme of the present embodiment all reduces to some extent than prior art.Therefore, its anti-arrowband jamming performance of the FSK scheme of the present embodiment is effectively promoted.
Demodulator circuit and the employing anti-white noise error rate contrast figure that fixedly demodulator circuit of filtering carries out demodulation that Fig. 5 provides for adopting the utility model embodiment tri-.This scheme adopts different demodulator circuits to carry out demodulation after the simple signal of 270KHz is added to white Gaussian noise.In Fig. 5, curve 1 is old270fsk, and for carrying out demodulation according to the fixing demodulator circuit of filtering, curve 2 is new270fsk, and for carrying out demodulation according to the demodulator circuit of BREATHABLE BANDWIDTH, wherein abscissa is different signal to noise ratio, and vertical coordinate is the different error rate.In Fig. 5, the in the situation that of identical signal to noise ratio, its error rate that adopts different demodulator circuits to produce is different.Particularly, as shown in Figure 5, if signal to noise ratio is 12 o'clock, for curve 1, its error rate approaches 10-1, and for curve 2, its error rate approximates 0.03.Fig. 5 can show no matter add Gauss's white noise of any signal to noise ratio, the demodulator circuit of employing the present embodiment scheme, and with respect to adopting demodulator circuit of the prior art, its error rate all promotes to some extent, and the anti-noise jamming performance of demodulator circuit is more.
Embodiment tetra-
The present embodiment, on the basis of above-described embodiment scheme, is explained to the demodulator circuit of power line carrier signal by the implementation of PSK demodulator circuit.The structural representation of the PSK demodulator circuit that Fig. 6 provides for the utility model embodiment tetra-.As shown in Figure 6, in such scheme, demodulation module 104 comprises: the 3rd adjustable lowpass filter unit 601, the 3rd mixing unit 602, loop tracing unit 603;
The 3rd adjustable lowpass filter unit 601, carries out respectively filtering for this in-phase signal and this orthogonal signalling that demodulation module 104 is received, and exports the signal of the 3rd adjustable lowpass filter unit 601 outputs to the 3rd mixing unit 602;
The 3rd mixing unit 602, is connected with the 3rd adjustable lowpass filter unit 601, for the signal of the 3rd adjustable lowpass filter unit 601 outputs is multiplied each other, obtains the 3rd mixed frequency signal, and exports loop tracing unit 603 to;
Loop tracing unit 603, be connected with the 3rd mixing unit 602 and numerical control oscillating unit 603, for obtaining the phase information of the 3rd mixed frequency signal, and according to this phase information, numerical control oscillating unit 603 is configured, so that the 3rd adjustable lowpass filter unit 601 obtains the 3rd restituted signal, and export the 3rd restituted signal as phase shift keying PSK restituted signal.
The 3rd this in-phase signal of 601 pairs of adjustable lowpass filter units and this orthogonal signalling are carried out respectively filtering, can comprise the 4th adjustable LPF604 and the 5th adjustable LPF605, the 4th adjustable LPF604 carries out filtering to this in-phase signal, and the 5th adjustable LPF605 carries out filtering to these orthogonal signalling.The 3rd mixing unit 602 can comprise the 5th frequency mixer 606.The 3rd mixing unit 602, by the 5th frequency mixer 606, be connected with the 3rd adjustable lowpass filter unit 601, the signal of the signal of the 4th adjustable LPF604 output and the 5th adjustable LPF605 output is multiplied each other, obtain the 3rd mixed frequency signal, and export loop tracing unit 603 to.
Loop tracing unit 603 can comprise loop filter, adder and Delta K register.This loop tracing unit 603 obtains the phase information of the 3rd mixed frequency signal by this loop filter and adder, and this phase information is passed through to Delta K register transfer to numerical control oscillating unit 203, to change the frequency of this numerical control oscillating unit institute output signal, and then reach the object of following the trail of phase place.Numerical control oscillating unit 203 according to the value of Delta K register to the frequency shift of output signal after, again by processing module 102, filtration module 103 and demodulation module 104 in this demodulator circuit, now, the signal that the 4th adjustable LPF604 in this demodulation module 104 exports is PSK restituted signal.
The present embodiment scheme provides a kind of demodulator circuit of PSK demodulation, and it can carry out PSK demodulation to the carrier signal of different bandwidth, and its concrete beneficial effect is similar to the above embodiments, does not repeat them here.
Embodiment five
The present embodiment, on the basis of above-described embodiment scheme, is explained to the demodulator circuit of power line carrier signal by the implementation of DPSK demodulator circuit.The structural representation of the DPSK demodulator circuit that Fig. 7 provides for the utility model embodiment five.As shown in Figure 7, in such scheme, demodulation module 104 comprises: the 4th adjustable lowpass filter unit 701, differential phase shift demodulating unit 702, the 5th adjustable lowpass filter unit 703.
The 4th adjustable lowpass filter unit 701, is connected with the first adjustable lowpass filter unit 105, for this in-phase signal and this orthogonal signalling are carried out to filtering, and exports the signal of the 4th adjustable lowpass filter unit 701 outputs to differential phase shift demodulating unit 702.
Differential phase shift demodulating unit 702, be connected with the 5th adjustable lowpass filter unit 703, for the signal of the 4th adjustable lowpass filter unit 701 outputs is carried out to differential phase shift processing, and export the signal of differential phase shift demodulating unit 702 outputs to the 5th adjustable lowpass filter unit 703.
The 5th adjustable lowpass filter unit 703, carries out filtering to the signal of differential phase shift demodulating unit 702 outputs, obtains the 4th restituted signal, and exports the 4th restituted signal as differential phase keying (DPSK) DPSK restituted signal.
Wherein, the 4th adjustable lowpass filter unit 701 can comprise the 6th adjustable LPF704 and the 7th adjustable LPF705; This differential phase shift demodulating unit 702 can be DPSK demodulator; The 5th adjustable lowpass filter unit 703 can comprise the 8th adjustable LPF706.The 6th adjustable LPF704 carries out filtering to in-phase signal, the 7th adjustable LPF705 quadrature signal is carried out filtering, after the signal of the 6th adjustable LPF704 and the 7th adjustable LPF705 output carries out demodulation through DPSK demodulator, then the signal of exporting by the 8th adjustable LPF706 is DPSK restituted signal.
The present embodiment scheme provides a kind of demodulator circuit of DPSK demodulation, and it can carry out DPSK demodulation to the carrier signal of different bandwidth, and its concrete beneficial effect is similar to the above embodiments, does not repeat them here.
Embodiment six
The present embodiment provides a kind of microcontroller.The structural representation of the microcontroller that Fig. 8 provides for the utility model embodiment six.As shown in Figure 8, this microcontroller 801 comprises: demodulator circuit 802, input port 803 and output port 804.
Wherein, this demodulator circuit 802 can be the demodulator circuit described in above-mentioned arbitrary embodiment scheme.
Input port 803, the carrier signal of inputting for receiving ancillary equipment 805, and this carrier signal is transferred to this demodulator circuit 802;
Output port 804, exports to this ancillary equipment 805 for the restituted signal that this demodulator circuit 802 is exported afterwards through algorithm process.
The microcontroller that the present embodiment provides can be the chip of the demodulator circuit of integrated above-described embodiment, and implementation procedure and beneficial effect that it is concrete are similar to the above embodiments, do not repeat them here.
Finally it should be noted that: each embodiment, only in order to the technical solution of the utility model to be described, is not intended to limit above; Although the utility model is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of each embodiment technical scheme of the utility model.
Claims (7)
1. a demodulator circuit for power line carrier signal, is characterized in that, comprising: processing module, filtration module and demodulation module; Wherein, described filtration module comprises: the first fixedly low-pass filter unit, the first adjustable lowpass filter unit; Described first fixedly low-pass filter unit be connected with described the first adjustable lowpass filter unit;
Described processing module, by described first fixedly low-pass filter unit be connected with described filtration module, for the carrier signal receiving is processed, to generate mixed frequency signal, and export described mixed frequency signal to described first fixing low-pass filter unit;
Described filtration module, is connected with described demodulation module by described the first adjustable lowpass filter unit; The described first fixing low-pass filter unit, for described mixed frequency signal is carried out to filtering, and by described first fixedly the signal of low-pass filter unit output export described the first adjustable lowpass filter unit to; Described the first adjustable lowpass filter unit, for the described first signal that fixedly low-pass filter unit is exported is carried out to filtering, and exports the signal of described the first adjustable lowpass filter unit output to described demodulation module;
Described demodulation module, for according to different demodulation modes, the signal of described the first adjustable lowpass filter unit output being generated to corresponding restituted signal, and exports described restituted signal.
2. demodulator circuit according to claim 1, is characterized in that, described processing module, comprising: numerical control oscillating unit and the first mixing unit;
Described numerical control oscillating unit, for generation of and export the first local orthogonal signalling and the second local orthogonal signalling;
Described the first mixing unit, comprises the first frequency mixer and the second frequency mixer; Wherein, described the first frequency mixer is connected with described numerical control oscillating unit, for described carrier signal and described the first local orthogonal signalling are multiplied each other, obtains the first mixed frequency signal; Described the second frequency mixer is connected with described numerical control oscillating unit, for described carrier signal and described the second local orthogonal signalling are multiplied each other, obtains the second mixed frequency signal;
Described the first frequency mixer and described the second frequency mixer, also by described first fixedly low-pass filter unit be connected with described filtration module, for described the first mixed frequency signal and described the second mixed frequency signal are transferred to described filtration module;
Corresponding, the described first fixing low-pass filter unit, also for described the first mixed frequency signal and described the second mixed frequency signal are carried out respectively to filtering, and exports the described first signal that fixedly low-pass filter unit is exported to described the first adjustable lowpass filter unit; Described the first adjustable lowpass filter unit, also for to described first fixedly the signal of low-pass filter unit output carry out filtering, and export in-phase signal and orthogonal signalling to described demodulation module.
3. demodulator circuit according to claim 2, is characterized in that, described filtration module, also comprises: the first down-sampled unit;
Described the first down-sampled unit, fixedly low-pass filter unit and described the first adjustable lowpass filter unit are connected with described first, down-sampled for the described first signal that fixedly low-pass filter unit is exported is carried out, and export extremely described the first adjustable lowpass filter unit of the first low-frequency sampling signal and the second low-frequency sampling signal;
Corresponding, described the first adjustable lowpass filter unit, also for: described the first low-frequency sampling signal and the second low-frequency sampling signal are carried out to filtering, and export described in-phase signal and described orthogonal signalling to described demodulation module.
4. demodulator circuit according to claim 3, is characterized in that, described demodulation module, comprising: delay cell, the second mixing unit, frequency displacement demodulating unit, the second adjustable lowpass filter unit, the second down-sampled unit and second be low-pass filter unit fixedly; Described delay cell comprises the first delayer and the second delayer; Described the second mixing unit comprises three-mixer and the 4th frequency mixer; Described frequency displacement demodulating unit, comprises subtracter;
Described the first delayer, is connected with described three-mixer, for the described in-phase signal that described demodulation module is received, postpones, and obtains and postpones in-phase signal, and export described delay in-phase signal to described three-mixer;
Described the second delayer, is connected with described the 4th frequency mixer, for the described orthogonal signalling that described demodulation module is received, postpones, and obtains and postpones orthogonal signalling, and export described delay orthogonal signalling to described the 4th frequency mixer;
Described three-mixer, is connected with described subtracter, for according to described delay in-phase signal and described orthogonal signalling, produces homophase crossbar signal, and exports described homophase crossbar signal to described subtracter;
Described the 4th frequency mixer, is connected with described subtracter, for according to described delay orthogonal signalling and described in-phase signal, produces orthogonal crossover signal, and exports described orthogonal crossover signal to described subtracter;
Described subtracter, for by described homophase crossbar signal and described orthogonal crossover signal subtraction, obtains the first restituted signal, and exports described the first restituted signal to described the second adjustable lowpass filter unit;
Described the second adjustable lowpass filter unit, is connected with described frequency displacement demodulating unit by described subtracter, for described the first restituted signal is carried out to filtering, and exports the signal of described the second adjustable lowpass filter unit output to described the second down-sampled unit;
Described the second down-sampled unit, with described the second adjustable lowpass filter unit and described second fixedly low-pass filter unit be connected, down-sampled for the signal of described the second adjustable lowpass filter unit output is carried out, and export the signal of described the second down-sampled unit output to described second fixing low-pass filter unit;
The described second fixing low-pass filter unit, for the signal of described the second down-sampled unit output is carried out to filtering, obtains the second restituted signal, and exports described the second restituted signal as frequency shift keying fsk restituted signal.
5. demodulator circuit according to claim 3, is characterized in that, described demodulation module, comprising: the 3rd adjustable lowpass filter unit, the 3rd mixing unit, loop tracing unit;
Described the 3rd adjustable lowpass filter unit, carries out respectively filtering for described in-phase signal and described orthogonal signalling that described demodulation module is received, and exports the signal of described the 3rd adjustable lowpass filter unit output to described the 3rd mixing unit;
Described the 3rd mixing unit, is connected with described the 3rd adjustable lowpass filter unit, for the signal of described the 3rd adjustable lowpass filter unit output is multiplied each other, obtains the 3rd mixed frequency signal, and exports described loop tracing unit to;
Described loop tracing unit, be connected with described the 3rd mixing unit and described numerical control oscillating unit, for obtaining the phase information of described the 3rd mixed frequency signal, and according to described phase information, described numerical control oscillating unit is configured, so that described the 3rd adjustable lowpass filter unit obtains the 3rd restituted signal, and export described the 3rd restituted signal as phase shift keying PSK restituted signal.
6. demodulator circuit according to claim 3, is characterized in that, described demodulation module, comprising: the 4th adjustable lowpass filter unit, differential phase shift demodulating unit, the 5th adjustable lowpass filter unit;
Described the 4th adjustable lowpass filter unit, be connected with described the first adjustable lowpass filter unit, for described in-phase signal and described orthogonal signalling are carried out to filtering, and export the signal of described the 4th adjustable lowpass filter unit output to described differential phase shift demodulating unit;
Described differential phase shift demodulating unit, be connected with described the 5th adjustable lowpass filter unit, for the signal of described the 4th adjustable lowpass filter unit output is carried out to differential phase shift processing, and export the signal of described differential phase shift demodulating unit output to described the 5th adjustable lowpass filter unit;
Described the 5th adjustable lowpass filter unit, carries out filtering to the signal of described differential phase shift demodulating unit output, obtains the 4th restituted signal, and exports described the 4th restituted signal as differential phase keying (DPSK) DPSK restituted signal.
7. a microcontroller, is characterized in that, comprising: input port, output port and the demodulator circuit as described in any one in claim 1-6;
Described input port, the carrier signal of inputting for receiving ancillary equipment, and described carrier signal is transferred to described demodulator circuit;
Described output port, exports to described ancillary equipment for the restituted signal that described demodulator circuit is exported afterwards through algorithm process.
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| CN201420164442.5U CN203788281U (en) | 2014-04-04 | 2014-04-04 | Power line carrier signal demodulation circuit and microcontroller |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105811590A (en) * | 2014-12-30 | 2016-07-27 | 无锡华润矽科微电子有限公司 | Method for realizing amplitude modulation signal demodulation and decoding in wireless charging device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105811590A (en) * | 2014-12-30 | 2016-07-27 | 无锡华润矽科微电子有限公司 | Method for realizing amplitude modulation signal demodulation and decoding in wireless charging device |
| CN105811590B (en) * | 2014-12-30 | 2018-05-25 | 无锡华润矽科微电子有限公司 | Amplitude-modulated signal demodulation and decoded method are realized in wireless charging device |
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Address after: 200235 Shanghai city Xuhui District Longcao Road No. 299 Tianhua Information Technology Park Building 2 floor A block 5 Patentee after: SHANGHAI EASTSOFT MICROELECTRONICS Co.,Ltd. Address before: 200235 Shanghai city Xuhui District Longcao Road No. 299 Tianhua Information Technology Park Building 2 floor A block 5 Patentee before: SHANGHAI HAIER INTEGRATED CIRCUIT Co.,Ltd. |
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Granted publication date: 20140820 |