CN1355612A - Radio receiving controller and its control method - Google Patents
Radio receiving controller and its control method Download PDFInfo
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- CN1355612A CN1355612A CN 00132582 CN00132582A CN1355612A CN 1355612 A CN1355612 A CN 1355612A CN 00132582 CN00132582 CN 00132582 CN 00132582 A CN00132582 A CN 00132582A CN 1355612 A CN1355612 A CN 1355612A
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Abstract
A radio receiving control device couples the AND gate with the output end of receiving device, connects the counter with the ANO gate, connects the feed-back controller with the counter and comparator separately, couples the digit/analog converter with the feed-back controller, connects the variable capacity diode with the digit/analog convertor and the local oscillator with the receiving device separately. The control method of it unilizes the characteristic that the bit duration will create a change in the received data when the carrier wave frequency deviation is produced between the radio transmitting and receiving devices to adjust the local oscillator signal frequency as per the bit duration variation of thd detected receiving data for obtaining the optimum receiving state.
Description
The relevant a kind of radio reception control device of the present invention and method, particularly the radio reception control device and the method thereof of relevant a kind of automatically calibrating receive frequency.
Along with science and technology is constantly progressive, the electronics and the communication technology are also flourish day by day thereupon, wireless communication system especially, and its development is at a tremendous pace especially.Show that as real time information (Real Time Information Display) is equipped with portable electronic bits of data receiving system, widely popular the use.With regard to communication system,, become considerable personal communication instrument such as teleseme (or being called pager, pager, Beeper or B.B.Call), mobile phone (Mobile Phone) and other radio transmission device etc.In the general radio communication system, all have radio signal receiving apparatus, its major function is for receiving external radio signal.With the teleseme is example, and when the originator will summon user to pager, will the collect mail pager number of end and the information code that will transmit of originator sent to base station, again by base station according to pager number transmission radio signal to being subjected to calling terminal.When being subjected to calling terminal to receive wireless signal, be subjected to the pager of calling terminal just can notify the user to have information to enter, and display frame information.
Consult Fig. 1, it is shown to be a kind of calcspar of conventional wireless electricity receiver.In this kind conventional wireless electricity receiver 100, radio signal is received by antenna 102, and (Low-Noise Amplifier, LNA) 104 are amplified the signal that is received by low-noise amplifier again.And through amplifying signal by radio frequency band filter (Radio Frequency Band-Pass Filter, RF BPF) 106 the filtering of vacation picture (Image) interference signal after, be resent to frequency mixer (Mixer) 108.Through the signal of filtering with from the local oscillated signal of local oscillator (Local Oscillator) by frequency mixer 108 receive with produce intermediate-freuqncy signal (Intermediate Frequency, IF).
As shown in Figure 1, the intermediate-freuqncy signal of frequency mixer 108 outputs with the noise filtering outside all receiving channelss, is amplified output by intermediate frequency amplifier 114 through if bandpas filter (IF BPF) 12 again.After the signal after the amplification is then by demodulator (Demodulator) 116 demodulation, it is reduced, and the Base Band analog signal that is transmitted to obtain on the carrier wave (Base Band Analog Signal, BBAS).The Base Band analog signal that obtains after demodulation is transferred into low pass filter (Low Pass Filter) 118 and filters, and the noise filtering with beyond the Base Band is resent to voltage comparator (Comparator) 120.And voltage comparator 120 is to be benchmark with the reference voltage, is that digital signal is exported again with the Base Band analog signal conversion after filtering, and handles for digital circuit, to read the content of received information.
In order to promote the performance of radio receiver, therefore the general if bandpas filter that adopts (is also referred to as channel filter, Channel Filter), its frequency range is and can makes carrier (boc) modulated signals pass through required minimum frequency range, use the signal noise that improves received signal than (Signal-to-NoiseRatio, S/N) and obtain enough adjacent channel rejections than (Adjacent ChannelRejection).
When using this kind conventional wireless electricity receiver 100, intermediate-freuqncy signal is the local oscillated signal exported by external carrier signal and local oscillator 110 smear and producing in frequency mixer 108.When but central frequent rate produces skew, its received signal will be decayed because of the influence of the if bandpas filter of narrow frequency range, cause the sensitivity (Sensitivity) of received signal to descend, and cause the bit error rate (Bit Error Rate) of data to rise.Therefore, the local oscillator 110 in the conventional wireless electricity receiver 100, its running must be highly stable, and accurately adjust the local oscillating frequency that it is exported, and makes intermediate-freuqncy signal be had correct IF-FRE.
Though in such as the wireless general analog signal receiver of frequency modulation (Frequency Modulation), often dispose automatic frequency control (Automatic Frequency Control, AFC) circuit.But it is for the signal that transfer of data received, because signal 0 does not wherein have symmetry with signal 1, also is that the data 0 in the data not necessarily equate with the number of data 1.And in order to reduce the required frequency range of transmission, be to adopt not reply zero (Non-Return to zero when transmitting, NRZ) mode transmits the bit data, therefore can't carry out FEEDBACK CONTROL (Feedback Control) to local oscillator by the mode of taking out direct current composition in the received signal.
Because of the local oscillating frequency skew causes the problem that receiving signal sensitivity descends and the data bit error rate rises, the general solution that adopts can roughly be divided into two kinds: one for adopting the local oscillator of high precision about above-mentioned; One for using the intermediate-frequency filter of frequency range broad.But when in radio receiver, using the local oscillator of high precision, must spend, and will cause the production procedure of receiver complicated than higher cost.
And, because all parts have its temperature variation characteristic respectively in the radio receiver, produce skew because of variations in temperature, so must cooperate temperature-compensation circuit or, make the temperature maintenance of whole system constant in the thermostat mode for preventing local oscillating frequency.Yet make system keep constant temperature in the thermostat mode, the power of its required consumption is bigger, and is not suitable for widely popular now employed portable type (Portable) communication apparatus.Moreover the part in the radio receiver also can cause local oscillating frequency to produce skew owing to using the aging phenomenon (Aging) that produces, and therefore need regularly proofread and correct, and has preferable user mode to keep it.Yet this measure meeting improves use cost, and causes user's inconvenience, and the problem that skew is caused takes place the frequency that more can't solve because of the radio signal transmitting terminal.
Between radio transmitter and the receiver, the frequency shift (FS) phenomenon that is caused because of adjustment, variations in temperature and part are aging etc., though can adopt the mode that increases the if bandpas filter frequency range is improved, but when increasing the band pass filter frequency range, partly noise also can pass through filter thereupon, thereby has reduced the sensitivity of radio receiver.And this kind also can rise because of radio uses the frequency of frequency spectrum gradually to increase the mode that frequency range improves frequency shift (FS), and causes its effect unclear, makes more deterioration of frequency shift (FS) phenomenon.In addition, because the frequency range of IF-FRE is limited, can not unrestrictedly increase, and it still need satisfy in the receiver specification requirement for adjacent channel rejection ratio, so when radio uses the frequency of frequency spectrum to rise gradually, can cause this increase frequency range to lose efficacy in the mode of improving frequency shift (FS).
In view of above-mentioned background of invention, and utilize when skew takes place carrier frequency between radio transmitting apparatus and the receiving system, the characteristic that can cause the bit duration (Bit Duration) of its data that receive to change, one of so main purpose of the present invention, provide a kind of radio reception control device, detect the variation situation that it receives the bit duration of data with oversampling circuit (Over Sampling eircuit), and, adjust the frequency of local oscillated signal with feedback controling mode via after the calculation process.By revising local oscillating frequency, it is consistent that radio transmitting apparatus and the frequency between the receiving system are kept, and make radio system reach best accepting state, to promote its receiving sensitivity.
Another object of the present invention provides a kind of radio reception control method, utilize when skew takes place carrier frequency between radio transmitting apparatus and the receiving system, the characteristic that can cause the bit duration of its data that receive to change, it receives the variation situation of the bit duration of data with the oversampling mode detection, carry out calculation process again, adjust the frequency of local oscillated signal then with feedback controling mode, to obtain correct receiving system IF-FRE and minimum data bit errors rate.
Radio reception control device of the present invention is achieved in that a kind of radio reception control device, in order to control a radio system, this radio system is in order to receive a radio signal, and this radio system has an antenna, one frequency mixer, one local oscillator, one demodulator and a comparator, this frequency mixer couples with this antenna and this local oscillator respectively, this demodulator couples with this frequency mixer and this comparator respectively, this radio reception control device couples with this comparator and this local oscillator respectively, it is characterized in that: wherein this radio reception control device comprises at least: one with the door, couple with this comparator and a sampled signal generator respectively, compare in order to the oversampling clock pulse signal that a digital signal and this sampled signal generator of this comparator output are exported, and export a sampling value; One counter is kicked and is coupled with this output with door, in order to receive this sampling value and this sampling value is counted, to export a count value; One feedback controller couples with this counter and this comparator respectively, in order to receiving this count value from this counter, and exports a corrected signal according to this count value; One digital/analog converter couples with this feedback controller, in order to receive this corrected signal from this feedback controller, revises voltage to adjust one of this digital/analog converter output; An and varicap, couple with this digital/analog converter and this local oscillator respectively, revise voltage in order to receive, changing the capacitance of this varicap, and adjust the frequency of this local oscillator from this of this digital/analog converter.
Radio receiving system of the present invention is achieved in that a kind of radio receiving system, it is characterized in that: wherein comprise at least: an antenna, in order to receive a radio signal; One frequency mixer couples with this antenna; One local oscillator couples with this frequency mixer, and in order to produce a local oscillated signal, this radio signal and this local oscillated signal receive via this frequency mixer and effect produces an intermediate-freuqncy signal; One demodulator couples with this frequency mixer, in order to receiving this intermediate-freuqncy signal, and produces a Base Band analog signal; One comparator couples with this demodulator, and this Base Band analog signal that this comparator receives a reference voltage and the output of this demodulator respectively compares, to produce a digital signal; One with door, couple with this comparator, should receive this digital signal that an oversampling clock pulse signal and this comparator export respectively with door and compare, and produce a sampling value; One counter couples with this and door, counts in order to receive this sampling value, to produce a count value; One feedback controller couples with this counter and this comparator respectively, in order to receiving this count value of this counter output, and produces a corrected signal according to this count value; One digital/analog converter couples with this feedback controller, in order to receive this corrected signal, revises voltage to adjust one of this digital/analog converter output; An and varicap, couple with this digital/analog converter and this local oscillator respectively, in order to receiving this correction voltage of this digital/analog converter output, changing the capacitance of this varicap, and adjust the frequency of this local oscillator.
Wherein also comprise having an amplifier, couple with this antenna and this frequency mixer respectively.
Wherein also comprise having a radio frequency band filter, couple with this antenna and this frequency mixer respectively.
Wherein also comprise having an if bandpas filter, couple with this frequency mixer and this demodulator respectively.
Wherein also comprise having an intermediate frequency amplifier, couple with this frequency mixer and this demodulator respectively.
Wherein also comprise having a low pass filter, couple with this demodulator and this comparator respectively.
The radio receiving system of automatically calibrating receive frequency of the present invention is achieved in that a kind of radio receiving system of automatically calibrating receive frequency, it is characterized in that: wherein comprise at least: an antenna, in order to receive a radio signal; One low-noise amplifier couples with this antenna, in order to receive and to amplify this radio signal; One radio frequency band filter couples with this low-noise amplifier, in order to filter this radio signal of being amplified by this low-noise amplifier; One frequency mixer couples with this radio frequency band filter, and a local oscillator couples with this frequency mixer, and in order to produce a local oscillated signal, this radio signal and this local oscillated signal receive via this frequency mixer and effect produces an intermediate-freuqncy signal; One if bandpas filter couples with this frequency mixer, in order to receive and to filter this intermediate-freuqncy signal; One intermediate frequency amplifier couples with this if bandpas filter, in order to this intermediate-freuqncy signal that receives and amplification is filtered by this if bandpas filter; One demodulator couples with this intermediate frequency amplifier, in order to reception this intermediate-freuqncy signal by this intermediate frequency amplifier amplification, and produces a Base Band analog signal; One low pass filter couples with this demodulator, in order to filter this Base Band analog signal by this demodulator output; One comparator, with this low pass filter coupled, this comparator receives a reference voltage respectively and this Base Band analog signal compares, to produce a digital signal; One with door, couple with this comparator, should receive this digital signal that an oversampling clock pulse signal and this comparator export respectively with door and compare, and produce a sampling value; One counter couples with this and door, counts in order to receive this sampling value, to produce a count value; One feedback controller couples with this counter and this comparator respectively, in order to receiving this count value of this counter output, and produces a corrected signal according to this count value; One digital/analog converter couples with this feedback controller, in order to receive this corrected signal, to adjust the correction voltage of this digital/analog converter output; An and varicap, couple with this digital/analog converter and this local oscillator respectively, in order to receiving this correction voltage of this digital/analog converter output, changing the capacitance of this varicap, and adjust the frequency of this local oscillator.
Signal receiving control device of the present invention is achieved in that a kind of signal receiving control device, in order to control a signal receiving device, this signal receiving device is in order to receive a signal, and this signal receiving device has a signal receiver, one frequency mixer, one local oscillator, one demodulator and a comparator, this frequency mixer couples with this signal receiver and this local oscillator respectively, this demodulator couples with this frequency mixer and this comparator respectively, this signal receiving control device couples with this comparator and this local oscillator respectively, wherein this signal receiving control device comprises at least: one with the door, couple with this comparator and a sampled signal generator respectively, compare in order to the oversampling clock pulse signal that a digital signal and this sampled signal generator of this comparator output are exported, and export a sampling value; One counter couples with this output with door, in order to receive this sampling value and this sampling value is counted, to export a count value; One feedback controller couples with this counter and this comparator respectively, in order to receiving this count value from this counter, and exports a corrected signal according to this count value; One digital/analog converter couples with this feedback controller, in order to receive this corrected signal from this feedback controller, revises voltage to adjust one of this digital/analog converter output; An and varicap, couple with this digital/analog converter and this local oscillator respectively, revise voltage in order to receive, changing the capacitance of this varicap, and adjust the frequency of this local oscillator from this of this digital/analog converter.
Radio reception control method of the present invention is achieved in that when reception one radio signal also is converted to a corresponding digital signal with this radio signal, in order to from the dynamic(al) correction receive frequency, it is characterized in that: wherein this radio reception control method comprises the following steps: with an oversampling clock pulse signal this digital signal to be had the sampling of an oversampling ratio at least, to produce a sampling value; This sampling value is counted to produce a count value, and this count value has bit duration data at least; Judge the relation of this count value and oversampling ratio, calculate and adjust an output voltage; And adjust a local oscillating frequency according to this output voltage.
Wherein, calculate and adjust in the step of this output voltage, also comprise when these bit duration data are 0, reduce this output voltage with a default step in the relation of this count value of above-mentioned judgement and oversampling ratio.
Wherein, calculate and adjust in the step of this output voltage, also comprise when this count value equals a sampled data length and multiply by this oversampling ratio, with a default step this output voltage that raises in the relation of this count value of above-mentioned judgement and oversampling ratio.
Wherein in the relation of this count value of above-mentioned judgement and oversampling ratio, calculate and adjust in the step of this output voltage, also comprise when this count value is not equal to a sampled data length and multiply by this oversampling ratio, and these bit duration data are greater than this an oversampling ratio and a permissible range sum, according to these bit duration data and this oversampling ratio and this permissible range and difference, adjust this output voltage.
Wherein in the relation of this count value of above-mentioned judgement and oversampling ratio, calculate and adjust in the step of this output voltage, also comprise when these bit duration data and be not equal to zero and poor less than this an oversampling ratio and a permissible range, according to these bit duration data and this oversampling ratio and this permissible range and difference, adjust this output voltage.
Signal acceptance control method of the present invention is achieved in that a kind of signal acceptance control method, when being a digital signal of correspondence at reception one signal and with this conversion of signals, in order to from the dynamic(al) correction receive frequency, wherein this signal acceptance control method comprises the following steps: with an oversampling clock pulse signal this digital signal to be had the sampling of an oversampling ratio at least, to produce a sampling value; This sampling value is counted to produce a count value, and this count value has bit duration data at least; And adjust a local oscillating frequency according to this output voltage, make a local oscillated signal and this signal mixing with this local oscillating frequency.
Wherein in the relation of this count value of above-mentioned judgement and oversampling ratio, calculate and adjust in the step of this output voltage, also comprise when these bit duration data are 0, a default step reduces this output voltage.
Wherein, calculate and adjust in the step of this output voltage, also comprise when this count value equals a sampled data length and multiply by this oversampling ratio, with a default step this output voltage that raises in the relation of this count value of above-mentioned judgement and oversampling ratio.
Wherein in the relation of this count value of above-mentioned judgement and oversampling ratio, calculate and adjust in the step of this output voltage, also comprise when this count value is not equal to a sampled data length and multiply by this oversampling ratio, and these bit duration data are greater than this an oversampling ratio and a permissible range sum, according to these bit duration data and this oversampling ratio and this permissible range and difference, adjust this output voltage.
Wherein in the relation of this count value of above-mentioned judgement and oversampling ratio, calculate and adjust in the step of this output voltage, also comprise when these bit duration data being not equal to zero and poor less than this an oversampling ratio and a permissible range, according to this output voltage of discrepancy adjustment of these bit duration data and this oversampling ratio and this permissible range sum.
The present invention is a kind of radio reception control device, has the radio system of antenna, frequency mixer, local oscillator, demodulator and comparator in order to control.Have in the radio reception control device and door (AND Gate), counter (Counter), feedback controller (Feedback Controller), digital/analog converter (Digital/Analog Converter), varicap (VariableCapacitance Diode).Wherein with door and radio system in comparator couple, counter then and with door joins, feedback controller links with counter respectively, and digital/analog converter is to couple with feedback controller, and varicap then is connected with local oscillator in digital/analog converter and the radio system respectively.
Moreover according to above-mentioned and other purpose of the present invention, the present invention provides a kind of radio receiving system again, wherein has the antenna of received signal; Couple with antenna and local oscillator respectively in order to the frequency mixer that produces intermediate-freuqncy signal; Demodulator then respectively with frequency mixer and low pass filter coupled, in order to produce the Base Band analog signal; Be connected with the comparator sum counter respectively with door, receive oversampling control signal and digital signal, to produce sampling value from comparator; And feedback controller respectively sum counter, digital/analog converter couple, the count value of count pick up device output is given digital/analog converter to produce corrected signal; Varicap then is connected with digital/analog converter and local oscillator respectively, changes its capacitance by the digital/analog converter adjustment, uses the frequency of revising local oscillator.
In addition, according to above-mentioned and other purpose of the present invention, the present invention also provides a kind of radio reception control method.
Describe above-mentioned and other purposes of the present invention, feature and advantage in detail below in conjunction with preferred embodiment and accompanying drawing:
Fig. 1 is a kind of calcspar of conventional wireless electricity receiver.
Fig. 2 is according to preferred embodiment of the present invention, a kind of block schematic diagram of radio receiving system.
Fig. 3 can clap spectrum diagram when differing from correct IF-FRE for local oscillating frequency and centre carrier frequency.
Fig. 4 can clap when differing from correct IF-FRE the contrast figure of Base Band analog signal and its corresponding digital signals for local oscillating frequency and centre carrier frequency.
Fig. 5 is that local oscillating frequency and the poor IF-FRE that draws of centre carrier frequency bat have the spectrum diagram when being offset.
Fig. 6 claps for local oscillating frequency and centre carrier frequency and differs from the IF-FRE that draws when skew is arranged, the contrast figure of Base Band analog signal and its corresponding digital signals.
Fig. 7 is according to preferred embodiment of the present invention, a kind of schematic flow sheet of radio reception control method.
Fig. 8 is according to preferred embodiment of the present invention, a kind of radio reception control method, and heart rate uprises or the local oscillating frequency step-down in the carrier wave, finely tunes the sequential chart of various signals when revising.
Fig. 9 is according to preferred embodiment of the present invention, a kind of radio reception control method, and centre carrier frequency step-down or local oscillating frequency uprise, and finely tune the sequential chart of various signals when revising.
Figure 10 is according to preferred embodiment of the present invention, a kind of radio reception control method, and local oscillating frequency and centre carrier frequency skew are too big, the sequential chart of various signals when carrying out the frequency correction.
See also Fig. 2, it is shown to be according to preferred embodiment of the present invention, and a kind of block schematic diagram of radio receiving system comprises radio system 202 and radio reception control device 204 in radio receiving system 200.Radio system 202 is similar with traditional radio receiver, has antenna 210, low-noise amplifier 212, radio frequency band filter 214, frequency mixer 216, local oscillator 218, if bandpas filter 220, intermediate frequency amplifier 222, demodulator 224, low pass filter 226 and comparator 228.
As shown in Figure 2, in radio system 202, antenna 210 is in order to the radio signal 230 that receives self-corresponding radio transmitting system to be produced, and for example is the radio signal of being sent by base station.And low-noise amplifier 212 is connected with antenna 210, radio frequency band filter 214 respectively, in order to amplification of radiocommunication signal 230, and exports them to radio frequency band filter 214 filtering false image interference signals.216 in frequency mixer couples mutually with radio frequency band filter 214, local oscillator 218, in order to receiving through the radio signal 230 of filtering and local oscillated signal 232 from local oscillator 218, and produces intermediate-freuqncy signal 234.
If bandpas filter 220 among Fig. 2 is connected with frequency mixer 216, intermediate frequency amplifier 222 respectively, behind the noise of intermediate-freuqncy signal 234 outside all receiving channelss of if bandpas filter 220 filterings, by intermediate frequency amplifier 222 it is amplified output again.Demodulator 224 couples with intermediate frequency amplifier 222, low pass filter 226 respectively, the Base Band analog signal (BBAS) 236 that intermediate-freuqncy signal 234 through amplifying is reduced on the carrier wave to be transmitted by demodulator 224, and be sent to low pass filter 226 with the noise filtering beyond the Base Band.And voltage comparator 228 links to each other with low pass filter 226, its input receives respectively through the Base Band analog signal 236 of filtering and reference voltage 238, and be benchmark with reference voltage 238, Base Band analog signal 236 is converted to digital signal 240 outputs, separates for other digital circuits (not being shown among the figure) and read the information content that is received.
Radio reception control device 204 among Fig. 2 is in order to control radio system 202, has and door 250, counter 252, feedback controller 254, digital/analog converter 256, varicap 258 and oversampling gate generator 260.Wherein with door 250 respectively with counter 252 and radio system 202 in voltage comparator 228 couple, its input receives respectively from the digital signal 240 of voltage comparator 228 and the oversampling clock pulse signal 242 that is higher than message transmission rate from oversampling gate generator 260.Compare with generation sampling value 244 with the signal of 250 pairs of inputs of door, and export it to counter 252.And counter 252 receives from counting 246 outputs of back generation count value with the sampling value 244 of door 250, and this count value is the bit duration of data in the signal that is received.
Feedback controller 254 among Fig. 2 respectively with counter 252, digital/analog converter 256, radio system 202 in comparator 228 couple, count value 246 in order to 252 outputs of count pick up device, and carry out computing according to this count value 246, produce corrected signal 248 then.The corrected signal 248 that digital/analog converter 256 receives from feedback controller 254, and produce corresponding correction voltage 262.Varicap 258 then is connected with local oscillator 218 in digital/analog converter 256 and the radio system 202 respectively, varicap 258 receives the correction voltage 262 of digital/analog converter 256 outputs, uses the frequency that changes the local oscillated signal 232 of local oscillator 218 outputs in the radio system 202.
Local oscillator 218 in the receiving system 202 of radio receiving system 200, its function is for producing local oscillated signal 232.And the radio transmitting system corresponding with radio receiving system 200 is to utilize carrier wave to transmit information, and it also has the particular carrier wave centre frequency.When the frequency of local oscillated signal 232 and centre carrier frequency can be clapped difference when going out correct IF-FRE in frequency mixer 216, utilization has can make carrier (boc) modulated signals pass through the if bandpas filter of required minimum frequency range, can reduce noise, to improve the signal noise ratio of signal.
Yet the present invention also can be applicable to wired electric signal and receives control, and wherein radio signal receiving apparatus can change the wired electric signal receiving system into, and the antenna in order to receive radio signals can change the cable in order to the transmission wired electric signal into.
See also Fig. 3, it is shown is local oscillating frequency and centre carrier frequency and can claps the spectrum diagram of difference when going out correct IF-FRE, and wherein the transverse axis representative is frequency, F
RFBe centre carrier frequency, f
RF Δ FAnd f
RF+ Δ FSignal frequency, F
LOBe local oscillating frequency, F
IFBe the intermediate-freuqncy signal frequency, F in this example
IF=F
RF-F
LO, and BW
IFFrequency range (BW for if bandpas filter
IF≈ 2 Δ F).
What Fig. 4 was shown can clap difference when going out correct IF-FRE for local oscillating frequency and centre carrier frequency, and Base Band analog signal (BBAS) digital signal corresponding with it contrasts to be schemed, its transverse axis representative be the time, and longitudinal axis representative is voltage.As previously mentioned, through demodulator and Base Band low pass filter and draw, the digital signal 402 item corresponding with Base Band analog signal 400 is by Base Band analog signal and reference voltage (V to the Base Band analog signal 400 among the figure by intermediate-freuqncy signal
Ref) after the voltage comparator comparison, produce.Can clap difference when going out correct IF-FRE when local oscillating frequency and centre carrier frequency, Base Band analog signal (BBAS) 400 is symmetrical in reference voltage (V
Ref), therefore numeral 0/1 signal 402 by voltage comparator output has correct bit duration (T
b).
Clap IF-FRE that difference draws when being offset to some extent when the local oscillating frequency of the carrier frequency of radio transmitting system and radio receiving system, intermediate-freuqncy signal causes signal receiving sensitivity to descend because of decayed by if bandpas filter.See also Fig. 5, what it was shown is that local oscillating frequency and the poor IF-FRE that draws of centre carrier frequency bat have the spectrum diagram when being offset.Fig. 5 and Fig. 3 are similar, and wherein the transverse axis representative is frequency, and identical signal is then represented with identical label, and F
LO 'Be the local oscillating frequency of skew, F
IF 'Be the intermediate-freuqncy signal frequency of skew, F
IF '=F
RF-F
LO ', and BW
IFFrequency range (BW for if bandpas filter
IF≈ 2 Δ F).
That Fig. 6 is shown is the Base Band analog signal and the digital signal contrast figure of corresponding diagram 5.As shown in Figure 6, clap IF-FRE that difference draws when skew is arranged,, cause Base Band analog signal 600 to be asymmetric with reference voltage (V because the skew of IF-FRE causes the skew of direct voltage when local oscillating frequency and centre carrier frequency
Ref), and then make corresponding digital signal 602 produce incorrect bit duration.
Use radio reception control device of the present invention can improve the harmful effect of frequency shift (FS), see also Fig. 2, produce oversampling control signal 242 with oversampling gate generator 260, and make oversampling control signal 242 that speed is higher than transfer of data and digital signal 240 via handling with door 250 and counter 252, taking a sample and counting the count value 246 that the back obtains to have bit duration information, and then this count value 246 is sent to feedback controller 254 calculates, to adjust the frequency of local oscillator 218 in the radio system 202.
See also Fig. 7, what it was shown is according to preferred embodiment of the present invention, a kind of schematic diagram of control flow of radio reception control method.Please when reception is controlled to radio signal, shown in the step 700 among Fig. 7, at first start automatic frequency control (AFC) function simultaneously with reference to Fig. 7 and Fig. 2, receive external signal, for example be radio signal, and be converted into digital signal output.This digital signal is removed for digital circuit and is separated the content of reading reception information, and is used to carry out automatic frequency control simultaneously.When for example using radio receiving system 200, start radio reception control device 204, the radio signal that is received is amplified, after the filtering, produced intermediate-freuqncy signal with the local oscillated signal smear.Then intermediate-freuqncy signal is carried out filtering, amplification, then it is reduced to the Base Band analog signal that carrier wave transmits.And behind the Base Band analog signal filtering noise information, compare with reference voltage, to produce digital signal output,, and supply radio reception control device 204 to carry out FEEDBACK CONTROL for the content of understanding reception information.
Secondly, utilize the oversampling clock pulse signal to digital signal carry out oversampling ratio (Over-Sampling Ratio) for the logic determines of N to produce sampled signal, again sampled signal is counted, with the count value BD (Bit Duration) that obtains having bit duration D data, wherein oversampling ratio N is the ratio of oversampling clock pulse signal and symbol rate (Symbol Rate).That is carried out is sampled as single when sampling, and bit duration equals count value (D=BD); If during average sample, then bit duration is that count value is the number H of logical one divided by sampled signal among the sampled data length S, be D=BD/H, wherein sampled data length S is the foundation as the default time out (Time Out) of scan pattern (Scanning Mode), general sampled data length S is greater than the transmission length of maximum continuous logic 1 in the system, to avoid the generation of malfunction.When carrying out the step 702 among Fig. 7, ask with the allowable deviation scope of oversampling ratio when obtained bit is continued and judge.When obtained bit duration D is in the allowable deviation scope of oversampling ratio N, be N-M≤D≤N+M, and M is the allowable deviation value, then local oscillated signal is not carried out the frequency correction, repeat this step 702 then, this follows pattern (Tracking Mode) for signal.Under this follows pattern, the feedback controller in the control device will not upgrade the output voltage (V of digital/analog converter
DAC), varicap is not kept its existing capacitance because of control voltage changes, so the local oscillator in the receiving system is not carried out the frequency correction.
If bit duration D not in the allowable deviation scope of oversampling ratio the time, then carries out the step 704 among Fig. 7, judge whether obtained bit duration D is all 0, promptly whether the data that received do not have just potential change and are all electronegative potential.If obtained bit duration D is all 0, the data that received are all electronegative potential, then carry out the step 706 among Fig. 7, the output voltage of digital/analog converter are reduced with predefined step, i.e. V
DAC=V
DAC-V
STEP, to local oscillating frequency in addition coarse adjustment proofread and correct fast, and then carry out step 702 again.
If in step 704, obtained bit duration D was all 0 o'clock, then carry out the step 708 among Fig. 7, whether obtained count value BD is equaled sampled data length S multiply by oversampling ratio N, promptly whether the data that received do not have the height potential change and are all high potential.(BD=S * N), then carry out the step 710 among Fig. 7 raises the output voltage of digital/analog converter with predefined step: i.e. V if the data that received do not have the height potential change and are all high potential
DAC=V
DAC+ V
STEP, to local oscillating frequency in addition coarse adjustment proofread and correct fast, and then carry out step 702 again.
Bit duration D does not fall in the allowable deviation scope of oversampling ratio, and the data that received have the height potential change, then carry out the step 712 among Fig. 7, difference according to bit duration D and oversampling ratio N, and the corresponding ratio of frequency change and change in voltage, adjust the output voltage of digital/analog converter, local oscillating frequency is finely tuned correction, expectation falls in the allowable deviation scope of oversampling ratio bit duration D, and then carry out step 702 again, this is signal fine setting pattern (Fine Tune Mode).
When the centre carrier frequency of radio transmitting system uprises or during the local oscillating frequency step-down of radio receiving system, can make frequency mixer output in again and again car increase, thereby cause that the direct current composition increases in the Base Band analog signal that demodulation produces, cause the bit duration of logical one in the digital signal of voltage comparator output elongated, and the bit duration of this growth can cause the count value of counter output to increase.Under signal fine setting pattern, after feedback controller reads count value, then revise the output voltage of digital/analog converter according to the deviation size of bit duration D and oversampling ratio N, use the capacitance that changes varicap.The capacitance of varicap is reduced, the frequency of local oscillator is risen, repeat fine setting the bit duration value is positioned within the permissible range, reach the receive frequency of receiving system and the purpose that emission system is complementary.
Otherwise, when the local oscillating frequency of the centre carrier frequency step-down of radio transmitting system or radio receiving system uprises, can adopt above-mentioned mode to revise, improve the varicap capacitance frequency of local oscillator is descended.Repeat fine setting then, the bit duration value is positioned within the permissible range, to reach the receive frequency purpose consistent that makes receiving system with emission system.
See also Fig. 8, what it was shown is that carrier wave center frequency car uprises or the local oscillating frequency step-down, finely tunes the sequential chart of various signals when revising.Comprising radio signal F
TX(comprise f
RF-Δ FAnd f
RF+ Δ F), local oscillated signal F
LO, intermediate-freuqncy signal F
IF, Base Band analog signal (BBAS), digital signal (DATA), output voltage signal (V
DAC).And Fig. 9 and Fig. 8 are similar, and it is shown then for centre carrier frequency step-down or local oscillating frequency uprise, and finely tune the sequential chart of various signals when revising.
When the centre carrier frequency skew of the receive frequency of radio receiving system and emission system is too big, digital signal general by voltage comparator output no longer changes with the modulation signal of emission system, then feedback controller is by the bit duration of counter output, can behind default time out, enter scan pattern, output voltage with default voltage step logarithm word/analog converter is adjusted, its output voltage is raise or reduction, by the capacitance that changes varicap, output frequency to local oscillator carries out coarse adjustment, and this is step 704～710 among Fig. 7.When the digital signal of receiving system output changed to some extent with the modulation signal of emission system again, then feedback controller can carry out the fine setting pattern again, made entire system have best transmitting-receiving frequency consistency.
See also Figure 10, what it was shown is that local oscillating frequency and centre carrier frequency skew are too big, the sequential chart of various signals when carrying out the frequency correction.Figure 10 and Fig. 8, Fig. 9 are similar, comprising radio signal F
TX(comprise f
RF-Δ FAnd f
RF+ Δ F), local oscillated signal F
LO, intermediate-freuqncy signal F
IF, Base Band analog signal (BBAS), digital signal, output voltage signal (V
DAC), be to be scan pattern in the stage casing of entire timing, the sequential back segment then is the fine setting pattern.
By the preferred embodiment of the invention described above as can be known, the present invention can be applicable to transmit with the carrier frequency shift modulation system the wired or wireless receiving system of digital data signal or analog signal.The present invention is when utilizing transmitting terminal and receiving terminal carrier frequency that skew takes place, and can cause the bit duration of the data that received this characteristic that changes, and carries out receive frequency from dynamic(al) correction.Use the following characteristics that have of the present invention:
1. the present invention is with the variation situation of the duration of its bit of oversampling electric circuit inspection, and via the local oscillating frequency of feedback modifiers receiving terminal after the computing, receiving terminal is locked on the carrier frequency consistent with transmitting terminal, therefore obtain correct receiving terminal IF-FRE, can adopt the if bandpas filter of minimum frequency range to reduce noise, change receiving sensitivity, promote the performance of receiving system.
2. the present invention adopts the control mode of loop circuit (Closed Loop), can reduce requirement to local oscillator precision, therefore can use the local oscillator of low precision, for example use the FREQUENCY CONTROL element of the quartz crystal of low precision as local oscillator, to reduce cost of parts and production, to adjust required cost, more can solve the problem that the transmitting terminal carrier frequency shift is caused that produces.
3. the present invention also can utilize software mode to set up test pattern (Test Mode), carries out from dynamic(al) correction when producing in batches, can save the required artificial adjustment cost of traditional mode of production mode.
Claims (19)
1, a kind of radio reception control device, in order to control a radio system, this radio system is in order to receive a radio signal, and this radio system has an antenna, one frequency mixer, one local oscillator, one demodulator and a comparator, this frequency mixer couples with this antenna and this local oscillator respectively, this demodulator couples with this frequency mixer and this comparator respectively, this radio reception control device couples with this comparator and this local oscillator respectively, it is characterized in that: wherein this radio reception control device comprises at least: one with the door, couple with this comparator and a sampled signal generator respectively, compare in order to the oversampling clock pulse signal that a digital signal and this sampled signal generator of this comparator output are exported, and export a sampling value; One counter is kicked and is coupled with this output with door, in order to receive this sampling value and this sampling value is counted, to export a count value; One feedback controller couples with this counter and this comparator respectively, in order to receiving this count value from this counter, and exports a corrected signal according to this count value; One digital/analog converter couples with this feedback controller, in order to receive this corrected signal from this feedback controller, revises voltage to adjust one of this digital/analog converter output; An and varicap, couple with this digital/analog converter and this local oscillator respectively, revise voltage in order to receive, changing the capacitance of this varicap, and adjust the frequency of this local oscillator from this of this digital/analog converter.
2, a kind of radio receiving system is characterized in that: wherein comprise at least: an antenna, in order to receive a radio signal; One frequency mixer couples with this antenna; One local oscillator couples with this frequency mixer, and in order to produce a local oscillated signal, this radio signal and this local oscillated signal receive via this frequency mixer and effect produces an intermediate-freuqncy signal; One demodulator couples with this frequency mixer, in order to receiving this intermediate-freuqncy signal, and produces a Base Band analog signal; One comparator couples with this demodulator, and this Base Band analog signal that this comparator receives a reference voltage and the output of this demodulator respectively compares, to produce a digital signal; One with door, couple with this comparator, should receive this digital signal that an oversampling clock pulse signal and this comparator export respectively with door and compare, and produce a sampling value; One counter couples with this and door, counts in order to receive this sampling value, to produce a count value; One feedback controller couples with this counter and this comparator respectively, in order to receiving this count value of this counter output, and produces a corrected signal according to this count value; One digital/analog converter couples with this feedback controller, in order to receive this corrected signal, revises voltage to adjust one of this digital/analog converter output; An and varicap, couple with this digital/analog converter and this local oscillator respectively, in order to receiving this correction voltage of this digital/analog converter output, changing the capacitance of this varicap, and adjust the frequency of this local oscillator.
3, radio receiving system as claimed in claim 2 is characterized in that: wherein also comprise having an amplifier, couple with this antenna and this frequency mixer respectively.
4, radio receiving system as claimed in claim 2 is characterized in that: wherein also comprise having a radio frequency band filter, couple with this antenna and this frequency mixer respectively.
5, radio receiving system as claimed in claim 2 is characterized in that: wherein also comprise having an if bandpas filter, couple with this frequency mixer and this demodulator respectively
6, radio receiving system as claimed in claim 2 is characterized in that: wherein also comprise having an intermediate frequency amplifier, couple with this frequency mixer and this demodulator respectively.
7, radio receiving system as claimed in claim 2 is characterized in that: wherein also comprise having a low pass filter, couple with this demodulator and this comparator respectively.
8, a kind of radio receiving system of automatically calibrating receive frequency is characterized in that: wherein comprise at least: an antenna, in order to receive a radio signal; One low-noise amplifier couples with this antenna, in order to receive and to amplify this radio signal; One radio frequency band filter couples with this low-noise amplifier, in order to filter this radio signal of being amplified by this low-noise amplifier; One frequency mixer couples with this radio frequency band filter, and a local oscillator couples with this frequency mixer, and in order to produce a local oscillated signal, this radio signal and this local oscillated signal receive via this frequency mixer and effect produces an intermediate-freuqncy signal; One if bandpas filter couples with this frequency mixer, in order to receive and to filter this intermediate-freuqncy signal; One intermediate frequency amplifier couples with this if bandpas filter, in order to this intermediate-freuqncy signal that receives and amplification is filtered by this if bandpas filter; One demodulator couples with this intermediate frequency amplifier, in order to reception this intermediate-freuqncy signal by this intermediate frequency amplifier amplification, and produces a Base Band analog signal; One low pass filter couples with this demodulator, in order to filter this Base Band analog signal by this demodulator output; One comparator, with this low pass filter coupled, this comparator receives a reference voltage respectively and this Base Band analog signal compares, to produce a digital signal; One with door, couple with this comparator, should receive this digital signal that an oversampling clock pulse signal and this comparator export respectively with door and compare, and produce a sampling value; One counter couples with this and door, counts in order to receive this sampling value, to produce a count value; One feedback controller couples with this counter and this comparator respectively, in order to receiving this count value of this counter output, and produces a corrected signal according to this count value; One digital/analog converter couples with this feedback controller, in order to receive this corrected signal, to adjust the correction voltage of this digital/analog converter output; An and varicap, couple with this digital/analog converter and this local oscillator respectively, in order to receiving this correction voltage of this digital/analog converter output, changing the capacitance of this varicap, and adjust the frequency of this local oscillator.
9, a kind of signal receiving control device, in order to control a signal receiving device, this signal receiving device is in order to receive a signal, and this signal receiving device has a signal receiver, one frequency mixer, one local oscillator, one demodulator and a comparator, this frequency mixer couples with this signal receiver and this local oscillator respectively, this demodulator couples with this frequency mixer and this comparator respectively, this signal receiving control device couples with this comparator and this local oscillator respectively, it is characterized in that: wherein this signal receiving control device comprises at least: one with the door, couple with this comparator and a sampled signal generator respectively, compare in order to the oversampling clock pulse signal that a digital signal and this sampled signal generator of this comparator output are exported, and export a sampling value; One counter couples with this output with door, in order to receive this sampling value and this sampling value is counted, to export a count value; One feedback controller couples with this counter and this comparator respectively, in order to receiving this count value from this counter, and exports a corrected signal according to this count value; One digital/analog converter couples with this feedback controller, in order to receive this corrected signal from this feedback controller, revises voltage to adjust one of this digital/analog converter output; An and varicap, couple with this digital/analog converter and this local oscillator respectively, revise voltage in order to receive, changing the capacitance of this varicap, and adjust the frequency of this local oscillator from this of this digital/analog converter.
10, a kind of radio reception control method, when being converted to a corresponding digital signal in reception one radio signal and with this radio signal, in order to from the dynamic(al) correction receive frequency, it is characterized in that: wherein this radio reception control method comprises the following steps: with an oversampling clock pulse signal this digital signal to be had the sampling of an oversampling ratio at least, to produce a sampling value; This sampling value is counted to produce a count value, and this count value has bit duration data at least; Judge the relation of this count value and oversampling ratio, calculate and adjust an output voltage; And adjust a local oscillating frequency according to this output voltage.
11, radio reception control method as claimed in claim 10, it is characterized in that: wherein in the relation of this count value of above-mentioned judgement and oversampling ratio, calculate and adjust in the step of this output voltage, also comprise when these bit duration data are 0, reduce this output voltage with a default step.
12, radio reception control method as claimed in claim 10, it is characterized in that: wherein in the relation of this count value of above-mentioned judgement and oversampling ratio, calculate and adjust in the step of this output voltage, also comprise when this count value equals a sampled data length and multiply by this oversampling ratio, with a default step this output voltage that raises.
13, radio reception control method as claimed in claim 10, it is characterized in that: wherein in the relation of this count value of above-mentioned judgement and oversampling ratio, calculate and adjust in the step of this output voltage, also comprise when this count value is not equal to a sampled data length and multiply by this oversampling ratio, and these bit duration data are greater than this an oversampling ratio and a permissible range sum, according to these bit duration data and this oversampling ratio and this permissible range and difference, adjust this output voltage.
14, radio reception control method as claimed in claim 10, it is characterized in that: wherein in the relation of this count value of above-mentioned judgement and oversampling ratio, calculate and adjust in the step of this output voltage, also comprise when these bit duration data and be not equal to zero and poor less than this an oversampling ratio and a permissible range, according to these bit duration data and this oversampling ratio and this permissible range and difference, adjust this output voltage.
15, a kind of signal acceptance control method, when being converted to a corresponding digital signal in reception one radio signal and with this radio signal, in order to from the dynamic(al) correction receive frequency, it is characterized in that: wherein this radio reception control method comprises the following steps: with an oversampling clock pulse signal this digital signal to be had the sampling of an oversampling ratio at least, to produce a sampling value; This sampling value is counted to produce a count value, and this count value has bit duration data at least; Judge the relation of this count value and oversampling ratio, calculate and adjust an output voltage; And adjust a local oscillating frequency according to this output voltage.
16, radio reception control method as claimed in claim 15, it is characterized in that: wherein in the relation of this count value of above-mentioned judgement and oversampling ratio, calculate and adjust in the step of this output voltage, also comprise when these bit duration data are 0, reduce this output voltage with a default step.
17, radio reception control method as claimed in claim 15, it is characterized in that: wherein in the relation of this count value of above-mentioned judgement and oversampling ratio, calculate and adjust in the step of this output voltage, also comprise when this count value equals a sampled data length and multiply by this oversampling ratio, with a default step this output voltage that raises.
18, radio reception control method as claimed in claim 15, it is characterized in that: wherein in the relation of this count value of above-mentioned judgement and oversampling ratio, calculate and adjust in the step of this output voltage, also comprise when this count value is not equal to a sampled data length and multiply by this oversampling ratio, and these bit duration data are greater than this an oversampling ratio and a permissible range sum, according to these bit duration data and this oversampling ratio and this permissible range and difference, adjust this output voltage.
19, radio reception control method as claimed in claim 15, it is characterized in that: wherein in the relation of this count value of above-mentioned judgement and oversampling ratio, calculate and adjust in the step of this output voltage, also comprise when these bit duration data and be not equal to zero and poor less than this an oversampling ratio and a permissible range, according to these bit duration data and this oversampling ratio and this permissible range and difference, adjust this output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00132582 CN1355612A (en) | 2000-11-29 | 2000-11-29 | Radio receiving controller and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00132582 CN1355612A (en) | 2000-11-29 | 2000-11-29 | Radio receiving controller and its control method |
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| Publication Number | Publication Date |
|---|---|
| CN1355612A true CN1355612A (en) | 2002-06-26 |
Family
ID=4595254
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00132582 Withdrawn CN1355612A (en) | 2000-11-29 | 2000-11-29 | Radio receiving controller and its control method |
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| CN (1) | CN1355612A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1317829C (en) * | 2003-08-28 | 2007-05-23 | 三洋电机株式会社 | Signal processing circuit for tuner |
| CN102217161A (en) * | 2008-10-30 | 2011-10-12 | 温科·昆茨 | Method and circuit for transmitting and receiving radio waves with a single oscillatory circuit antenna |
| CN102694564A (en) * | 2011-03-23 | 2012-09-26 | 笙科电子股份有限公司 | Circuit and method for automatically correcting antenna resonance frequency |
| CN103973609A (en) * | 2013-01-24 | 2014-08-06 | 郑国书 | Automatic correction method of offset frequency |
| CN104065344A (en) * | 2014-04-28 | 2014-09-24 | 无锡中星微电子有限公司 | Low-consumption oscillator |
| CN104105981A (en) * | 2011-10-19 | 2014-10-15 | B·苏博拉曼亚 | Directional speed and distance sensor |
| CN105615828A (en) * | 2014-11-06 | 2016-06-01 | 原相科技股份有限公司 | Main unit of high-precision physiological detection system and physiological detection device |
-
2000
- 2000-11-29 CN CN 00132582 patent/CN1355612A/en not_active Withdrawn
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1317829C (en) * | 2003-08-28 | 2007-05-23 | 三洋电机株式会社 | Signal processing circuit for tuner |
| CN102217161A (en) * | 2008-10-30 | 2011-10-12 | 温科·昆茨 | Method and circuit for transmitting and receiving radio waves with a single oscillatory circuit antenna |
| CN102217161B (en) * | 2008-10-30 | 2014-07-09 | ams国际有限公司 | Method and circuit for transmitting and receiving radio waves with a single oscillatory circuit antenna |
| CN102694564A (en) * | 2011-03-23 | 2012-09-26 | 笙科电子股份有限公司 | Circuit and method for automatically correcting antenna resonance frequency |
| CN102694564B (en) * | 2011-03-23 | 2015-02-11 | 笙科电子股份有限公司 | Circuit and method for automatically correcting antenna resonance frequency |
| CN104105981A (en) * | 2011-10-19 | 2014-10-15 | B·苏博拉曼亚 | Directional speed and distance sensor |
| CN103973609A (en) * | 2013-01-24 | 2014-08-06 | 郑国书 | Automatic correction method of offset frequency |
| CN104065344A (en) * | 2014-04-28 | 2014-09-24 | 无锡中星微电子有限公司 | Low-consumption oscillator |
| CN104065344B (en) * | 2014-04-28 | 2017-02-01 | 无锡中星微电子有限公司 | Low-consumption oscillator |
| CN105615828A (en) * | 2014-11-06 | 2016-06-01 | 原相科技股份有限公司 | Main unit of high-precision physiological detection system and physiological detection device |
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