WO2002067522A1 - Circuit de detection de phase et recepteur - Google Patents
Circuit de detection de phase et recepteur Download PDFInfo
- Publication number
- WO2002067522A1 WO2002067522A1 PCT/JP2002/001244 JP0201244W WO02067522A1 WO 2002067522 A1 WO2002067522 A1 WO 2002067522A1 JP 0201244 W JP0201244 W JP 0201244W WO 02067522 A1 WO02067522 A1 WO 02067522A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- phase
- output
- quantization
- value
- quadrant
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
- H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
- H04L27/2275—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses the received modulated signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0044—Control loops for carrier regulation
- H04L2027/0063—Elements of loops
- H04L2027/0067—Phase error detectors
Definitions
- the present invention relates to a phase detection circuit and a receiver for detecting the phase of a frequency-modulated or phase-modulated reception signal in wireless communication, and more particularly to a digital communication system.
- the present invention relates to a phase detection circuit for detecting the phase of a signal and a receiver.
- FIG. 30 is a diagram showing a configuration of a conventional phase detection circuit disclosed in, for example, JP-A-6-77737.
- a conventional phase detection circuit detects the phase of a received signal from a baseband signal.
- 101 is a quadrant judging unit
- 102 is a rotation projecting unit
- 103 is an integrator
- 104 is a 1-bit quantizer
- 105 is a delay unit
- 10 6 is an adder.
- 107 is a low-pass filter.
- a delta-sigma modulator is composed of a rotation projection unit 102, an integrator 103, a 1-bit quantizer 104, a delay unit 105, an adder 106, and a quadrant determination unit 101.
- the quadrant judging section 101 judges the quadrant of the received signal from the positive / negative of the received in-phase component and quadrature component received baseband signal, and outputs a coarse phase value according to the result.
- the quadrant of the received signal is the first, second, third, or fourth quadrant, 0, 1, 2, and 3 are output, respectively.
- Rotation projection section 102 rotates the received complex baseband signal by +7 74 or 1 ⁇ 4 in accordance with the data output from delay device 105. Further, a signed value obtained by projecting the rotated signal onto a straight line that bisects the quadrant detected by the quadrant determining unit 101 and a straight line orthogonal to the origin is output. Then, the output of the rotation projecting unit 102 is integrated by the integrator 103 and further quantized by the 1-bit quantizer 104.
- the one-bit quantizer 104 outputs, for example, 1 when the output of the integrator 103 is positive, and outputs 0 when the output is negative.
- the adder 106 adds the output value and the coarse phase value output from the quadrant determining unit 101. Further, the delay unit 105 delays the output of the 1-bit quantizer 104 by one basic clock (1 cycle) of the denolet sigma modulator and outputs it to the rotation projection unit 102.
- FIG. 31 is a diagram showing a configuration of the low-pass filter 107.
- 201 is a shift register
- 202-1, 202-2,..., 202-k are multipliers
- 203 is an adder.
- the phase data output from the adder 106 is sequentially input to the shift register 201. .., 202—k multiply the contents of each register by a coefficient
- adder 203 adds all the multiplication results. For example, if the coefficient is lZk, it appears in the output of the k-stage moving average power S adder 203.
- the received complex baseband signal is represented by I + jQ.
- the output of the delay unit 105 is 1, the received signal is rotated by one ⁇ / 4, and can be expressed as shown in Expression (1).
- the rotation projection unit 102 projects this signal on a straight line that bisects the quadrant detected by the quadrant determination unit 101 and a straight line that is orthogonal to the origin.
- the direction of the perpendicular H is determined such that the direction in which the phase increases in the quadrant detected by the quadrant determining unit 101 matches the positive direction of the straight line.
- the unit direction vector of a straight line that bisects the first quadrant and a straight line that is orthogonal at the origin can be defined as follows if the direction of the second quadrant is positive. 1 no 2, 1 / V2).
- the projection of the rotated received signal onto this straight line is expressed by the inner product of the straight line and the unit direction vector, so when the output of the delay unit 105 is 1, as shown in equation (3), When the output is 0, they can be expressed as shown in equation (4).
- Equation (5) when the output of the delay unit 105 is 1, and by Equation (6) when the output of the delay unit 105 is 0: Each can be represented.
- Equation (7) when the output of the delay unit 105 is 1, as shown in Equation (8) when the output of the delay unit 105 is 0,
- Equation (8) when the output of the delay unit 105 is 0,
- the unit direction vector of the straight line that bisects the fourth quadrant and the straight line that is orthogonal to the origin at the origin is determined as follows so that the direction of the first quadrant is positive. 1 2, l / 2). Therefore, the projection of the rotated received signal onto this straight line is expressed by Equation (9) when the output of the delay unit 105 is 1, and expressed by Equation (10) when the output of the delay unit 105 is 0. , Can be represented respectively.
- the output of the adder 106 is the sum of the coarse phase value output from the quadrant determining unit 101 and the output of the 1-bit quantizer 104,
- the outputs of the quadrant judging unit 101, the rotation projecting unit 102, and the 1-bit quantizer 104 can be represented as shown in FIG.
- the rotation projection unit 102 outputs one I or Q to the integrator 103 according to the output of the delay unit 105.
- the output of the integrator 103 that integrates this represents the average value of the output of the rotation projection unit 102.
- the 1-bit quantizer 104 determines whether the output of the integrator 103 is positive or negative. For example, when this output is positive, it outputs 1 and outputs 1 I from the rotation projection unit 102 via the delay unit 105, and when it is negative, it outputs 0 and the delay unit 105 is output.
- Q is output from the rotation projection unit 102.
- the output of the integrator 103 that is, the average value of the output of the rotation projecting unit 102 is controlled so as to approach zero.
- the delta-sigma modulator (corresponding to the quadrant judging unit 101, the rotation projecting unit 102, the integrator 103, the 1-bit quantizer 104, the delay unit 105, and the adder 106) ) Operate N cycles (N is a natural number).
- N is a natural number.
- the adder 106 outputs 1 p times and 0 times q times, if the low-pass filter 107 simply averages this, the output is given by the equation (1 1) Become like
- FIG. 33 is a diagram showing a relationship between a phase of an input signal of a conventional phase detection circuit and a detected phase.
- FIG. 34 is a diagram showing output signal waveforms of various parts of the conventional phase detection circuit obtained by computer simulation.
- the horizontal axis represents time, and the unit of the numbers on the horizontal axis is cycle.
- (A) is the phase of the received baseband signal
- (b) is the in-phase component and the quadrature component of the received baseband signal
- (c) is the output of the rotational projection unit 102
- (d) is The output of the integrator 103
- (e) is the output of the 1-bit quantizer 104
- (f) is the output of the quadrant determiner 101
- (g) is the output of the adder 106.
- (h) is the output of the low-pass filter 107.
- the output (h) of the low-pass filter 107 is obtained by quantizing the phase (a) of the received baseband signal.
- I-Q and I + Q are created from the received baseband signals I and Q, input to the phase detection circuit, and the detected base phase is subtracted from the detected phase by the quantum value corresponding to 45 degrees.
- the phase of the signal is determined.
- FIG. 35 is a diagram showing a configuration of a PSK receiver provided with a conventional phase detection circuit different from the above.
- 301 and 302 are mixers
- 303 is a local oscillator
- 304 is a quadrature splitter
- 305 and 306 are low-pass filters
- 307 and 308 are amplifiers
- 309 is an amplifier.
- 310 is an A / D converter (AZD)
- 311 is a conventional phase detection circuit
- 312 is a demodulator.
- This phase detection circuit 311 is constituted by a read-only memory (ROM).
- Local oscillator 303 oscillates a local oscillation signal having a frequency equal to the center frequency of the received signal.
- the orthogonal splitter 304 splits the local oscillation signal to generate an orthogonal local oscillation signal.
- Mixers 301 and 302 mix the received signal received at the input terminal and the quadrature local oscillator signal to generate baseband signals of in-phase and quadrature components.
- the low-pass filters 305 and 306 remove unnecessary wave components from the baseband signal, and the amplifiers 307 and 308 amplify the signal after removing the unnecessary components. Then, A / D converters 309 and 310 quantize in-phase component I and orthogonal component Q of the baseband signal.
- the phase detection circuit 311 detects the phase of the received signal from the baseband signal. Specifically, the ROM of the phase detection circuit 311 stores the quantized baseband signals I, The value of the phase ⁇ -arctan (Q / I) corresponding to Q is written in advance, and the phase ⁇ is read using the quantized baseband signals I and Q as addresses. Finally, the demodulators 312 demodulate the received data according to the phase ⁇ .
- FIG. 36 is a diagram showing a configuration of a conventional receiver capable of suppressing a dynamic range.
- the level detector 3 1 ′ 3 and the amplifiers 3 0 7 and 3 8 8 which operate as variable gain amplifiers are provided, and the level detector 3 13 3 detects the spanned signal.
- the gain of the variable gain amplifiers 307 and 308 was increased or decreased according to the level.
- the output of the adder 106 of the conventional phase detection circuit becomes “3 or 4 ”Force changes to“ 0 or 1 ”. Therefore, the output of the low-pass filter 107 has a value of about 2 in the middle, and largely deviates from a value of about 0 or 4 which is a correct phase.
- the addition operation is simply performed ignoring the cyclic nature of the phase, when the phase of the received signal changes over 0 or 2 ⁇ , the low-pass There was a problem that the phase output from the filter 107 might not be output correctly (for example, part A in Fig. 34 (h)).
- the rotation projection unit 102 when the received baseband signal I + jQ moves from the first quadrant to the second quadrant, the rotation projection unit 102 outputs one I (negative value) when the received signal is in the first quadrant or Outputs Q (positive value), but outputs 1 Q (negative value) or 1 I (positive value) when the received signal enters the second quadrant.
- the absolute value of I is close to zero, the absolute value of Q is small. Therefore, the output of the rotation projection unit 102 changes depending on the data output from the delay unit 105, and when 0 is output, Q is changed from Q in the first quadrant to 1 I in the second quadrant.
- the conventional analog FM receiver using the phase detection circuit has a problem that the phase detection value becomes inaccurate due to the above two problems, and thus the distortion rate characteristic of the demodulated signal is deteriorated.
- the FSK receiver and the PSK receiver using the phase detection circuit have a problem that the received bit error rate characteristic is deteriorated.
- receivers using conventional phase detectors composed of ROMs are equipped with an AGC. The AGC could not follow, and as a result, the distortion rate characteristics deteriorated in the analog FM receiver, and the reception bit error rate characteristics deteriorated in the FSK receiver and the PSK receiver.
- an object of the present invention is to provide a phase detection circuit capable of realizing accurate phase detection. Another object of the present invention is to provide a receiver that does not require a high-resolution A / D converter or AGC amplification, and that can improve the distortion characteristic and the received bit error rate characteristic. Disclosure of the invention
- a first quantization means (corresponding to a phase quantization unit 401 in an embodiment described later) for quantizing the phase of a received baseband signal;
- Conversion conversion means (corresponding to a conversion selection section 402) for performing a linear conversion on the basis of a predetermined rule and selecting and outputting a signal after the linear conversion; and an output of the conversion selection means Integrating means (corresponding to an integrator 103), second quantizing means (corresponding to a 1-bit quantizer 104) for determining the sign of the integration result and quantizing it,
- Delay means (corresponding to a delay device 105) for delaying the output of the second quantization means for a predetermined first time, and outputting the delayed signal to the conversion selecting means;
- Adding means (corresponding to an adder 1) for adding the output of the quantization means and the output of the second quantizing means modulo the quantized value of the phase 2 ⁇ ; If there is a phase value that crosses the quantized value of phase 2% among all data in the shift register, all data is converted according to a pre
- the conversion process is not performed, and the average calculation of the phase value should be performed in this state. Accordingly, characterized in that it comprises a low pass through over-filter means for outputting a phase value obtained by smoothing the quantization noise (corresponding to a low-pass filter 2), a.
- the first quantization means for quantizing the phase of the received baseband signal, linearly converting the received signal based on a predetermined rule, Conversion selection means for selecting and outputting a signal (corresponding to a conversion selection section 403); integration means for integrating the output of the conversion selection means; and the integration result based on the output of the first quantization means.
- a second quantizing means (corresponding to a 1-bit quantizer 5) for determining and quantizing the sign of the signal; delaying the output of the second quantizing means for a predetermined time; Delay means for outputting to the conversion selecting means, addition means for adding the output of the first quantization means and the output of the second quantization means modulo the quantization value of phase 2 ⁇ ,
- the phase values after the addition are sequentially latched by an internal shift register, If all the data in the shift register has a phase value that crosses the quantization value of phase 2 ⁇ , all data are converted according to a predetermined rule, and if there is no phase value that crosses the quantization value of phase 2 ⁇ , Is characterized by comprising: low-pass filter means for outputting a phase value obtained by smoothing quantization noise by performing an average operation of phase values in this state without performing conversion processing.
- the first quantization means, the conversion selection means, the integration means, the second quantization means, the delay means, and the adder constitutes a delta-sigma modulator.
- phase detection circuit includes a delta-sidder modulator including a plurality of stages of integrators.
- a sample-and-hold means for holding the reception baseband signal constant for a predetermined second time is provided. (Corresponds to the sample-and-hold circuit 3).
- a quadrant judging means (corresponding to a quadrant judging unit 101) for judging a quadrant of the received signal from the received baseband signal, and a rotation of the received signal based on a predetermined rule Then, a rotation projecting means (corresponding to the rotation projecting unit 102) for projecting the signal after the rotation on a specific straight line, an integrating means for integrating an output of the rotation projecting means, and a sign of the integration result is determined.
- Quantization means for delaying the signal after quantization by a first predetermined time, and outputting the delayed signal to the rotation projecting means; and Adding means for adding the output and the signal after the quantization modulo a phase of 2%; and sequentially latching the phase value after the addition in an internal shift register, and storing 2 ⁇ in all the data in the shift register. If there is a phase value In this case, the phase value is converted to a predetermined value, and if there is no phase value that exceeds 2 ⁇ , the conversion process is not performed. And a low-pass filter means for outputting a phase value obtained by smoothing.
- the quadrant determination means, the rotation projection means, the integration means, the quantization means, the delay means and the addition means constitute a delta-sigma modulator. It is characterized by.
- a quadrant judging means for judging a quadrant of the received signal from the received baseband signal, after rotating the received signal based on a predetermined rule, and after rotating the received signal to a specific straight line
- Rotation projection means for projecting a signal (corresponding to the rotation projection unit 4); integration means for integrating the output of the rotation projection means;
- a quantizing means (corresponding to a 1-bit quantizer 5) for judging and quantizing the sign of the integration result based on the quadrant; delaying the quantized signal by a predetermined time; Delay means for outputting a signal to the rotation projecting means; addition means for adding the output of the quadrant judging means and the signal after the quantization modulo the phase 2 ⁇ ; and the phase value after the calo calculation
- the phase value is converted into a predetermined specific value, and 2 ⁇ is converted to a predetermined value.
- a conversion process is not performed if there is no phase value to cross over, and a low-pass filter unit that outputs a phase value obtained by smoothing quantization noise by performing an average operation of the phase value in this state,
- a phase detection circuit is characterized by including a delta-sigma modulator including a plurality of stages of integrators.
- sample-and-hold circuit means for holding the reception baseband signal constant for a predetermined second time before the delta-sigma modulator. , Is provided.
- a first quantizing means for quantizing the phase of the received baseband signal, and a linear transformation of the received baseband signal based on a predetermined rule, Conversion selecting means for selecting and outputting the subsequent signal; integrating means for integrating the output of the conversion selecting means; second quantizing means for determining and quantizing the sign of the integration result; and Delay means for delaying an output of the quantization means for a predetermined first time, and outputting the delayed signal to the conversion selection means; an output of the first quantization means and the second quantum Adding means for adding the output of the converting means to the quantized value of the phase 2 ⁇ modulo, and sequentially latching the added phase value in an internal shift register, and among all the data in the shift register.
- the first quantization means, the conversion selection means, the integration means, the second quantization means, the delay means and the addition means constitute a delta-sigma modulator.
- a first quantizing means for quantizing the phase of the received baseband signal, and a linear transformation of the received baseband signal based on a predetermined rule, Conversion selecting means for selecting and outputting a subsequent signal; integrating means for integrating the output of the conversion selecting means; and quantizing by determining the sign of the integration result based on the output of the first quantizing means.
- a second quantizing means a delay means for delaying an output of the second quantizing means for a predetermined time, and outputting the delayed signal to the conversion selecting means; and Means for adding the output of the means and the second quantizing means modulo the quantized value of phase 2 ⁇ ; and latching the phase value after the addition in order with an internal shift register.
- a low-pass filter unit that outputs a phase value obtained by smoothing quantization noise by performing an averaging operation; and a demodulator that demodulates received data based on the phase value.
- the conversion means, the conversion selection means, the integration means, the second quantization means, the delay means and the addition means constitute a delta-sigma modulator.
- a receiver according to the next invention is characterized in that the inputs of the first quantization means and the conversion selection means are differential.
- a quadrant judging means for judging a quadrant of the received baseband signal, and after rotating the received signal based on a predetermined rule, a specific straight line Rotation projection means for projecting, integration means for integrating the output of the rotation projection means, quantization means for determining the sign of the integration result and quantizing, Delay means for delaying the delayed signal for a predetermined first time, and outputting the delayed signal to the rotation projecting means; and phase-shifting the output of the quadrant determining means and the quantized signal.
- An adding means for adding 2 ⁇ modulo; and a phase value after the addition is sequentially latched by an internal shift register, and when there is a phase value exceeding 2 ⁇ in all data in the shift register, The phase value is converted to a predetermined specific value. If there is no phase value exceeding 2 ⁇ , the conversion process is not performed, and the averaging operation of the phase value is performed in this state, thereby smoothing the quantization noise.
- a low-pass filter unit that outputs a shaded phase value; and a demodulator that demodulates received data based on the phase value.
- a quadrant judging means for judging a quadrant of the received baseband signal, and after rotating the received signal based on a predetermined rule, projecting the rotated signal on a specific straight line Rotation projecting means, integration means for integrating the output of the rotation projecting means, and quantization means for determining and quantizing the sign of the integration result based on the determined quadrant of the received signal; Delay means for delaying the quantized signal for a predetermined time, and outputting the delayed signal to the rotation projecting means; and outputting the quadrant determination means and the quantized signal in phase 2.
- an adding means for adding ⁇ modulo and a phase value after the addition is sequentially latched by an internal shift register, and when there is a phase value that crosses 2 ⁇ in all data in the shift register, the phase value is applied.
- the characteristics specified in advance If there is no phase value that exceeds 2 ⁇ , the conversion process is not performed, and the average value of the phase value is calculated in this state to output a phase value in which quantization noise is smoothed.
- the delta-sigma modulator is constituted by the adding means.
- the receiver according to the next invention is characterized in that the inputs of the quadrant judging means and the rotation projecting means are differential.
- a receiver according to the next invention is characterized by including a delta-sigma modulator having an M-order configuration.
- the demodulator receives the clock L times the symbol clock generated by the oscillator and the phase value, and determines the data determination timing from the phase value with a resolution of 1 / L of the symbol clock.
- a timing recovery unit (corresponding to a timing recovery unit 13) for generating a phase detection request timing for operating the low-pass filter unit; and receiving data based on the phase value and the data determination timing.
- a data judgment unit (corresponding to the data judgment unit 14) for judging, wherein the low-pass filter unit operates at a phase detection request timing.
- a sample-hold for holding the amplified received baseband signal constant for a predetermined second time before the delta-sigma modulator And circuit means.
- FIG. 1 is a diagram showing a configuration of a first embodiment of a phase detection circuit according to the present invention
- FIG. 2 is a diagram showing a configuration of a low-pass filter
- FIG. FIG. 4 is a diagram illustrating a configuration of a phase detection circuit according to a second embodiment of the present invention
- FIG. 4 is a diagram illustrating a configuration of a general phase detection circuit when a quantization resolution is ⁇
- FIG. FIG. 6 is a diagram for specifically explaining the operation of the conversion selecting unit.
- FIG. 6 is a diagram showing a configuration of the phase detection circuit according to the third embodiment of the present invention.
- FIG. FIG. 8 is a diagram illustrating a configuration of a phase detection circuit according to a third embodiment of the present invention.
- FIG. 8 is a diagram illustrating a configuration of a phase detection circuit according to a fourth embodiment of the present invention
- Fig. 10 is a diagram showing the output (output pattern ⁇ ) of the quadrant judging unit, the rotation projecting unit, and the 1-bit quantizer.
- FIG. 11 is a diagram illustrating an output of a 1-bit quantizer, a rotation projection unit, and FIG. 11 is a diagram illustrating an output of a quadrant determination unit, a rotation projection unit, and a 1-bit quantizer.
- FIG. 13 is a diagram showing an output signal waveform.
- FIG. 13 is a diagram showing a configuration of a phase detection circuit according to a fifth embodiment of the present invention.
- FIG. 14 is a diagram explaining the operation of the fifth embodiment.
- FIG. 15 is a diagram showing a determination result of a region to which a received signal belongs.
- FIG. 16 is a diagram showing a phase quantizer, a 1-bit quantizer, and a converter.
- FIG. 17 is a diagram illustrating the output of the selection unit.
- FIG. 17 is a diagram illustrating the output of the phase quantization unit, the 1-bit quantizer, and the conversion selection unit.
- FIG. 18 is a diagram illustrating the output of the phase quantization unit.
- FIG. 19 is a diagram showing the output (output pattern A) of the bit quantizer and the transform selector, and FIG. 19 shows the output of the phase quantizer, the 1-bit quantizer, and the transform selector (output pattern B).
- FIG. 20 is a diagram showing a configuration of a sixth embodiment of the phase detection circuit according to the present invention.
- FIG. 21 is a diagram showing the configuration of the phase detection circuit according to the present invention.
- FIG. 22 is a diagram illustrating a configuration of a phase detection circuit according to a seventh embodiment of the present invention.
- FIG. 22 is a diagram illustrating a configuration of the phase detection circuit according to the seventh embodiment of the present invention.
- FIG. 24 is a diagram illustrating a configuration of a receiver according to an eighth embodiment including the phase detection circuit according to the present invention.
- FIG. 24 illustrates a configuration of a phase quantization unit (quadrant determination unit) in the receiver in FIG.
- FIG. 25 is a diagram showing a configuration of a conversion selection unit (rotational projection unit) in the receiver of FIG.
- FIG. 27 is a diagram illustrating a configuration of a receiver according to a ninth embodiment including a symbol.
- FIG. 27 is a diagram illustrating a configuration of a phase quantization unit ′ (quadrant determination unit) in the receiver according to the ninth embodiment.
- FIG. 28 is a diagram showing a configuration of a conversion selection unit (rotational projection unit) in the receiver according to the ninth embodiment.
- FIG. 30 is a diagram showing a configuration of a conventional phase detection circuit.
- FIG. 31 is a diagram showing a configuration of a conventional low-pass filter.
- FIG. 32 is a diagram showing a quadrant judging unit, a rotation projecting unit, and an output (output pattern A) of a 1-bit quantizer
- FIG. 33 is a diagram showing a conventional phase detecting circuit
- FIG. 34 is a diagram showing the relationship between the phase of the input signal and the detected phase
- FIG. 34 is a diagram showing the output signal waveform of each part of the conventional phase detection circuit obtained by computer simulation.
- FIG. 3 is a diagram showing a configuration of a conventional PSK receiver including a phase detection circuit.
- FIG. 36 is a diagram showing a configuration of a conventional receiver capable of suppressing a dynamic range.
- FIG. 1 is a diagram showing a configuration of a phase detection circuit according to a first embodiment of the present invention.
- 101 is a quadrant judging unit
- 102 is a rotation projecting unit
- 103 is an integrator
- 104 is a 1-bit quantizer
- 105 is a delay unit
- 1 is an adder.
- 2 is a low-pass filter.
- a delta sig modulator is constituted by the quadrant judging unit 101, the rotation projecting unit 102, the integrator 103, the 1-bit quantizer 104, the delay unit 105, and the adder 1.
- the quadrant judging unit 101 judges the quadrant of the received signal from the positive and negative signs of the received in-phase and quadrature components of the received baseband signal, and outputs a coarse phase value according to the result. If the quadrant of the received signal is the first, second, third, or fourth quadrant, 0, 1, 2, or 3 is output, respectively.
- Rotation projecting section 102 rotates the received complex baseband signal by + ⁇ / 4 or 1 ⁇ 4 according to the data output from delay device 105.
- a signed value obtained by projecting the rotated signal onto a straight line that bisects the quadrant detected by the quadrant determining unit 101 and a straight line orthogonal to the origin is output.
- the output of the rotation projection unit 102 is integrated by the integrator 103 and further quantized by the 1-bit quantizer 104.
- the 1-bit quantizer 104 outputs, for example, 1 when the output of the integrator 103 is positive, and outputs 0 when the output is negative.
- the delay unit 105 delays the output of the 1-bit quantizer 104 by one basic clock (1 cycle) of the delta-sigma modulator and outputs the delayed output to the rotation projection unit 102.
- the coarse phase value output from the quadrant determination unit 101 and the 1-bit quantizer 10 The output of 4 is calorie-calculated modulo the equivalent value of phase 2 ⁇ .
- the coarse phase value is represented by 0, 1, 2, and 3 as described above, and the output of the 1-bit quantizer 104 is 0 or 1, add 4 modulo.
- Such an adder can be easily realized by discarding the most significant bit of the 3-bit adder.
- the low-pass filter 2 smoothes the quantization noise based on the added phase data.
- FIG. 2 is a diagram showing a configuration of the low-pass filter 2.
- 201 is a shift register
- 202-1, 202-2,..., 202-k are multipliers
- 206 is an addition that modulates the equivalent value of phase 2 ⁇ .
- 204 is a comparison / determination unit
- 205-1, 205-2,..., 205-k are data conversion units.
- the phase data output from the adder 1 is sequentially input to the shift register 201.
- the comparison / determination unit 204 determines that the contents of the register contain both 0 and 3
- the data conversion units 205-1 to 205-k output the register output data from 0 ⁇ 4 and 1 ⁇ 5. , 2 ⁇ 2, 3 ⁇ 3.
- the comparison / determination unit 204 determines that 0 and 3 are not mixed in the register contents
- the data conversion units 205-1-1 to 205-k output the register output data without conversion.
- the adder 1 performs the addition modulo the phase 2 ⁇ , and the low-pass filter 2 outputs the phase of the output of the shift register 201 to be operated over 2 ⁇ .
- the range of the phase data is converted from 0 to 2 ⁇ (equivalent to 0 to 3 in the register output) to ⁇ to 3 ⁇ (equivalent to 2 to 5 in the output of the data converter), and the operation is performed.
- the range of the phase data was returned to 0 to 2 ⁇ (corresponding to 0 to 3).
- a correct average calculation result can be obtained, so that accurate phase detection can be realized.
- the quadrant determination unit 101 quantizes the phase of the received signal with 2 bits.
- the quantization resolution is N (natural number) Will be described.
- FIG. 3 is a diagram showing a configuration of a phase detection circuit according to a second embodiment of the present invention.
- reference numeral 401 denotes a phase quantization unit
- reference numeral 402 denotes a conversion selection unit.
- the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
- the phase quantization unit 401, the conversion selection unit 402, the integrator 103, the 1-bit quantizer 104, the delay unit 105, and the adder 1 Construct a delta-sigma modulator.
- FIG. 4 is a diagram showing a configuration of a general phase detection circuit when the quantization resolution is N.
- the signal plane is divided into fan-shaped regions ( ⁇ ) with a center angle of 2 ⁇ / ⁇ centered on the origin.
- the ith region (where i is a natural number) belongs to a point whose phase is greater than or equal to 2 (i-1) ⁇ and less than 2i ⁇ / ⁇ .
- the phase quantization section 401 determines a region to which the received complex baseband signal belongs, and outputs a phase quantization value according to the result. If the received signal belongs to the i-th area, i-11 is output.
- the conversion selection section 402 rotates the received complex baseband signal by + ⁇ / ⁇ or 1 ⁇ / ⁇ according to the data output from the delay device 105. Further, a signed value obtained by projecting the rotated signal is output on a straight line that bisects a region including the received signal detected by the phase quantization unit 401 and a straight line that is orthogonal to the origin at the origin. Then, the output of the conversion selecting section 402 is integrated by the integrator 103 and further quantized by the 1-bit quantizer 104.
- the 1-bit quantizer 104 outputs, for example, 1 when the output of the integrator 103 is positive, and outputs ⁇ when the output is negative.
- the adder 106 adds this output value to the phase quantization value output from the phase quantization unit 401.
- the delay unit 105 the output of the 1-bit quantizer 104 is used as the basic cutoff of the delta-sigma modulator. The output is output to the conversion selection unit 402 after being delayed by an amount corresponding to the clock.
- ⁇ is a value of 0 or more and less than 2 ⁇ /.
- the output of the delay unit 105 is 1, the received signal is rotated by 1 ⁇ / ⁇ , and can be expressed as in Expression (13).
- the conversion selection unit 402 projects this signal on a straight line that bisects the area detected by the phase quantization unit 401 and a straight line that is orthogonal to the origin at the origin.
- the direction of the orthogonal line is determined such that the direction in which the phase increases due to the area detected by the phase quantization unit 401 coincides with the positive direction of the straight line.
- the unit direction vector of the straight line bisecting the i-th region and the straight line orthogonal to the origin is (one sin (2 i ⁇ 1) ⁇ / ⁇ , cos (2 i ⁇ 1) ⁇ / ⁇ ). Become.
- the projection of the rotated received signal onto this straight line is expressed by the inner product of the straight line and the unit direction vector.
- the output of the conversion selection unit 402 can be represented by [;:] as in Expression (17) or Expression (18), and the deviation is a linear conversion of the received complex baseband signal.
- the conversion selecting unit 402 outputs one Asin (2 ⁇ / ⁇ -) or Asi ⁇ to the integrator 103 according to the output of the delay unit 105.
- the output of the integrator 103 that integrates this represents the average value of the output of the conversion selection unit 402.
- the 1-bit quantizer 104 determines whether the output of the integrator 103 is positive or negative. Then, when this output is positive, 1 is output, and one A si ⁇ (2 ⁇ / ⁇ - ⁇ ) is output from the conversion selection unit 402 via the delay unit 105, and when it is negative, 0 is output.
- As i ⁇ ⁇ is output from the conversion selection unit 402 via the delay unit 105.
- the output of the phase quantization unit 401 is i ⁇ 1, and the 1-bit quantizer 104 outputs 1 p times and 0 times q times. 06 outputs i p times and 1-1 times. Therefore, if the low-pass filter 107 simply averages this, the output will be as shown in equation (19).
- phase detection circuit 2 ⁇ / ⁇ times the output of the low-pass filter 107 is an approximate value of the phase.
- the operation of the phase detection circuit according to the present embodiment will be described. Here, only operations different from those of the above-described general phase detection circuit will be described.
- the adder 1 the phase quantization value output from the phase quantization unit 401 and the output of the 1-bit quantizer 104 are used. Add the modulo value of the phase 2 ⁇ modulo.
- the low-pass filter 2 smoothes the quantization noise based on the added phase data in the same procedure as in the first embodiment.
- the same effect as in the first embodiment described above can be obtained, and further, it is possible to cope with the case where the quantization resolution is ⁇ ⁇ (natural number).
- FIG. 6 and FIG. 7 are diagrams showing a configuration of the phase detection circuit according to the third embodiment of the present invention.
- reference numeral 3 denotes a sample and hold circuit.
- the same components as those in the first or second embodiment are denoted by the same reference numerals, and description thereof is omitted.
- the configuration of FIG. 6 is obtained by applying the sample and hold circuit 3 to the configuration of the first embodiment (FIG. 1), and the configuration of FIG. 7 is the configuration of the second embodiment.
- the sample-and-hold circuit 3 is applied to (FIG. 3)
- the present invention is not limited to this.
- the sample-and-hold circuit 3 may be applied to the configuration of FIG. 30 or FIG.
- the delta-sigma modulator in the phase detection circuit (in Fig. 6, quadrant judging unit 101, rotation projecting unit 102, integrator 103, 1-bit quantizer 104, delay unit 105, adder 1
- the phase quantization unit 401, the transformation selection unit 402, the integrator 103, the 1-bit quantizer 104, the delay unit 105, and the adder 1) provide sufficient precision phase by delta-sigma modulation.
- the received baseband signal is kept constant for ⁇ cycles until the quantized value of is obtained.
- the outputs of the rotation projection unit 102 and the conversion selection unit 402 become constant, so that a more accurate phase detection value can be obtained.
- the received baseband signal is kept constant for ⁇ cycles until a quantized value of sufficiently accurate phase is obtained by delta-sigma modulation. Therefore, the following problems remain.
- the transmission signal has a fixed frequency or phase for each symbol clock.
- the band is limited in order to suppress the spread of the spectrum of the transmission signal.
- the transmission signal has a certain frequency or phase at a specific timing for each symbol, and the frequency and The phase changes smoothly.
- the receiver cannot determine the frequency or phase at an arbitrary timing.It is necessary to find the timing at which the transmission signal takes a certain frequency or phase value, and to determine the data in synchronization with the timing. . Therefore, the receiver usually detects the frequency and phase of the received signal at intervals of 1/8 or 1/16 of the symbol clock, and searches for an appropriate data determination timing from among them.
- the phase detection circuit when the phase is detected at a period of 1/8 of the symbol clock, the phase detection circuit according to the third embodiment holds the baseband signal received at each detection by the sample-and-hold circuit 3 and outputs the delta-sigma signal. Since the modulator is operated for N cycles, a clock that is 8N times the symbol clock is required, and power consumption increases.
- FIG. 8 is a diagram showing a configuration of a phase detection circuit according to a fourth embodiment of the present invention.
- reference numeral 4 denotes a rotation projection unit whose operation is different from that of the above-mentioned rotation projection unit 102
- reference numeral 5 denotes a 1-bit quantization unit whose operation is different from that of the above-mentioned 1-bit quantization unit 104. It is.
- the same components as those in the first to third embodiments described above are denoted by the same reference numerals, and description thereof is omitted.
- a delta-sigma modulator is formed by a quadrant determination unit 101, a rotation projection unit 4, an integrator 103, a 1-bit quantizer 5, a delay unit 105, and an adder 1.
- FIG. 8 the configuration in FIG. 8 is described as an application example of the configuration of the first embodiment (FIG. 1) for convenience of explanation, but is not limited thereto. Fig.) May be described as an application example.
- the rotation projection unit 4 and the 1-bit quantizer 5 operate according to the output of the quadrant determination unit 101.
- the 1-bit quantizer 5 determines the sign of the output of the integrator 103 according to the output of the quadrant determiner 101,
- the 1-bit quantizer 5 determines the sign of the output of the integrator 103 according to the output of the quadrant determiner 101,
- the 1-bit quantizer outputs 1 when the output of the integrator 103 is positive, and outputs 0 when the output of the integrator 103 is negative. 2
- the outputs of the quadrant judging unit 101, the rotation projecting unit 4, and the 1-bit quantizer 5 can be represented as shown in FIG. This is called output pattern A for convenience.
- the rotation projection unit 4 reverses the sign of the output signal
- the sign of the output of the integrator 103 is also reversed. Therefore, at the same time as inverting the sign of the output signal, the decision of the 1-bit quantizer 5 is reversed so that 0 is output when the output of the integrator 103 is positive, and 1 is output when the output of the integrator 103 is negative. . Even if such sign inversion is performed, the output of the 1-bit quantizer 5 does not change.
- the 1-bit quantizer 5 outputs 0 when the output of the integrator 103 is positive, and 1 when the output of the integrator 103 is negative.
- outputs of the quadrant judging unit 101, the rotation projecting unit 4, and the 1-bit quantizer 5 can be represented as shown in FIG. This is referred to as output pattern B for convenience.
- the output patterns A and B are combined and output for each quadrant. That is, when the received signal is in the first quadrant, the output pattern A, output pattern B when the received signal is in the second quadrant, output pattern A when the received signal is in the third quadrant, and output pattern B when the received signal is in the fourth quadrant (Fig. 10) Alternatively, output pattern B when the received signal is in the first quadrant, output pattern A when the received signal is in the second quadrant, output pattern B when the received signal is in the third quadrant, output pattern A when the received signal is in the fourth quadrant, (Fig. 11).
- the rotation projection unit 4 sets the received signal in the first quadrant to —I (negative ) Or Q (positive value), and in the second quadrant, I (negative value) or Q (positive value). At this time, near the boundary between the first quadrant and the second quadrant, since the absolute value of I is close to Z, the change in the output of the rotation projection unit 4 is small.
- the phase detection value obtained by the modulator becomes accurate.
- a configuration using the sump-no-hold circuit 3 may be employed.
- FIG. 12 is a diagram showing output signal waveforms of various parts of the phase detection circuit according to the fourth embodiment obtained by computer simulation.
- the horizontal axis represents time, and the unit of the numbers on the horizontal axis is cycle.
- (A) is the phase of the received baseband signal
- (b) is the in-phase component and the quadrature component of the received baseband signal
- (c) is the output of the rotation projection unit 4
- (d) is the integral.
- E) is the output of the 1-bit quantizer 5
- (f) is the output of the quadrant judging unit 101
- (g) is the output of the adder 1.
- (h) is the waveform of the output of the low-pass filter 2.
- quadrant judging section 101 quantifies the phase of the received signal in two bits.
- the quantization resolution is N (natural number) will be described as a specific example, for example, a case where the phase of a received signal is quantized by 3 bits.
- FIG. 13 is a diagram showing a configuration of a phase detection circuit according to a fifth embodiment of the present invention.
- reference numeral 403 denotes a conversion selection unit. Note that the same components as those in the fourth embodiment described above are denoted by the same reference numerals, and description thereof is omitted.
- FIG. 14 is a diagram showing a specific example for explaining the operation of the fifth embodiment.
- the signal plane is divided into eight fan-shaped regions with the center angle ⁇ ⁇ 4 around the origin.
- a point whose phase is equal to or more than (i_l) ⁇ 4 and less than i ⁇ / 4 belongs to the ith region (i is a natural number).
- the phase quantization section 401 determines a region to which the received complex baseband signal belongs, and outputs a phase quantization value according to the result. For example, if the received signal belongs to the i-th area, i-11 is output.
- the phase quantization unit 401 determines the area to which the received signal belongs as shown in FIG. 15 from the magnitude of the positive and negative and the absolute value of the received in-phase component and quadrature component received baseband signal, as shown in FIG. The phase quantization value corresponding to the result is output.
- the conversion selecting section 403 and the 1-bit quantizer 5 operate according to the output of the phase quantizing section 401.
- the 1-bit quantizer 5 determines the sign of the output of the integrator 103 according to the output of the phase quantization unit 401.
- FIG. 16 and FIG. 17 are diagrams showing the outputs of the phase quantization unit 401, the 1-bit quantizer 5, and the conversion selection unit 403.
- the reason why the phase can be detected by the above operation will be described below.
- the outputs of the 1-bit quantizer 5 and the conversion selector 403 can be represented as shown in FIG. This will be referred to as output pattern A for convenience.
- the conversion selector 403 reverses the sign of the output signal
- the sign of the output of the integrator 103 is also reversed. Therefore, at the same time as inverting the sign of the output signal, the decision of the 1-bit quantizer 5 is reversed so that 0 is output when the output of the integrator 103 is positive, and 1 is output when the output of the integrator 103 is negative. Even if such sign inversion is performed, The output of the 1-bit quantizer 5 remains unchanged. That is, the outputs of the 1-bit quantizer and the conversion selector 403 can be represented as shown in FIG. This is called output pattern B.
- the output patterns A and B are combined and output for each area.
- the output pattern is A when the received signal is in the odd-numbered area
- the output pattern B is when the received signal is in the even-numbered area (Fig. 16).
- Output pattern B when the area is the area
- output pattern A when the received signal is the even-numbered area (Fig. 17).
- the phase detection circuit is configured by a first-order delta-sigma modulator, but in the sixth embodiment, the phase detection circuit is configured by a second-order or higher-order delta-sigma modulator. I do.
- FIG. 20 is a diagram showing a configuration of a phase detection circuit according to a sixth embodiment of the present invention.
- 6 is an adder
- 7 is an integrator.
- quadrant judging unit 101, rotation projecting unit 4, integrator 103, adder 6, integrator 7, 1-bit quantizer 5, delay unit 105, adder 1 constitutes a second-order delta-sigma modulator.
- the configuration of FIG. 20 is obtained by applying the adder 6 and the integrator 7 to the configuration of the above-described fourth embodiment (FIG. 8).
- the adder 6 and the integrator 7 may be applied to the configuration of the first embodiment (FIG. 1) or the conventional configuration (FIG. 30).
- phase detection circuit according to the sixth embodiment. It is to be noted that the components having the same reference numerals as those in Embodiments 1 to 5 described above operate similarly.
- the adder 6 adds the output of the rotation projecting unit 4 and the output of the integrator 103, and outputs the addition result to the integrator 7. And in the 1-bit quantizer 5, the integrator
- the phase detection circuit is configured by a second-order or higher denolet sigma modulator.
- the electric spectrum of the quantization noise is smaller on the low frequency side and is smaller on the high frequency side. Therefore, by removing high-frequency noise by the low-pass filter 2, the SN ratio can be greatly improved.
- phase detector is constituted by a secondary delta-sigma modulator.
- present invention is not limited to this. May be configured.
- a configuration using the sump-no-hold circuit 3 may be employed as in the above-described third embodiment.
- FIG. 21 is a diagram showing a configuration of a phase detection circuit according to a seventh embodiment of the present invention.
- the second-order delta-sigma modulator shown in the present embodiment is, for example, a configuration example of a second-order delta-sigma modulator shown on page 37 of Akira Yukawa “Oversampling A-D conversion technology” (Nikkei BP).
- a phase quantization unit 401, a conversion selection unit 400, an integrator 103, an adder 6, an integrator 7, a 1-bit quantizer 5, a delay unit 1 0 5, adder 1 forms a second-order delta-sigma modulator.
- the adder 6 and the integrator 7 are applied to the configuration of the above-described embodiment 5 (FIG. 13).
- adder 6 and integrator 7 may be applied to the configuration of Embodiment 2 (FIG. 3) or the conventional configuration (FIG. 4).
- the adder 6 subtracts the output of the conversion selecting section 400 from the output of the integrator 103 and outputs the result of the subtraction to the integrator 7. Then, the 1-bit quantizer 5 quantizes the output (integration result) of the integrator 7 and outputs 0 or 1.
- FIG. 22 is a diagram showing a configuration of a phase detection circuit different from that of FIG. 21 described above.
- the second-order delta-sigma modulator shown in this example is based on the configuration example of the second-order delta-sigma modulator shown on page 43 of Akira Yukawa, "Oversampling A-D Conversion Technology" (Nikkei BP). ing.
- reference numeral 8 denotes a delay unit
- reference numeral 9 denotes an amplifier. Note that the same components as those in FIG. 21 are denoted by the same reference numerals and description thereof will be omitted. Further, in FIG.
- the second-order delta-sigma modulator is composed of the modulator 5, delay unit 105, and adder 1.
- an adder 6, an integrator 7, a delay unit 8 and an amplifier 9 are applied to the configuration of the above-described fifth embodiment (FIG. 13) for convenience of explanation.
- adder 6, integrator 7, delay 8 and multiplier 9 may be applied to the configuration of Embodiment 2 (FIG. 3) or the conventional configuration (FIG. 4).
- the operation of the phase detection circuit of FIG. 22 will be described. It is to be noted that the components having the same reference numerals as those in Embodiments 1 to 6 described above operate similarly.
- the delay unit 8 delays the output of the integrator 103 by one cycle and outputs the result to the adder 6. Further, the amplifier 9 doubles the output of the conversion selection unit 403 and outputs the same to the adder 6. The adder 6 subtracts the output of the amplifier 9 from the output of the delay unit 8 and outputs the subtraction result to the integrator 7. Then, the 1-bit quantizer 5 quantizes the output (integration result) of the integrator 7 and outputs 0 or 1.
- the noise is shaped so that the electric cascade density of the quantization noise is small in the low frequency region of the signal band and large in the high frequency region outside the signal band. it can. Therefore, if the high-frequency region is suppressed by the subsequent low-pass filter 2, the overall noise power is reduced and the SN ratio is improved.
- the phase detection circuit is constituted by a second-order or higher-order denolet sigma modulator.
- the power spectrum density of the quantization noise is smaller on the low frequency side and smaller on the high frequency side as compared with the case where the phase detection circuit is configured by a first-order delta-sigma modulator as in the first to fifth embodiments. Therefore, the S / N ratio can be significantly improved by removing high-frequency noise using the low-pass filter 2.
- phase detector is constituted by a secondary delta-sigma modulator.
- present invention is not limited to this. May be configured.
- a configuration using the sample and hold circuit 3 may be adopted as in the above-described third embodiment.
- FIG. 23 is a block diagram showing a reception apparatus including the phase detection circuit (Embodiments 1 to 7) according to the present invention
- FIG. 2 is a diagram showing a configuration of the machine.
- 301 and 302 are mixers
- 303 is a local oscillator
- 304 is a quadrature splitter
- 305 and 306 are low-pass filters.
- 307 and 308 are amplifiers
- 11 is the phase detection circuit of Embodiments 1 to 7
- 312 is a demodulator.
- the phase detection circuit 11 detects the phase from the in-phase component I and the quadrature component Q of the received spanned signal.
- the phase detection circuit 11 may use any of the configurations of Embodiments 1 to 7.
- each component having the same reference numeral as the conventional one operates in the same manner.
- the quantization value of the phase is derived from the ratio ta ⁇ ⁇ of the in-phase component I and the quadrature component Q of the received baseband signal. Since the configuration uses a phase detection circuit that detects the phase, the phase can be detected irrespective of the envelope amplitude of the received signal, eliminating the need for a high-resolution A / D converter and AGC that were required in the past.
- the reception baseband signals of the in-phase component and the quadrature component have been input to the phase detection circuit as single-ended signals.
- the single-ended input phase detection circuit 11 detects the phase from the in-phase component I and the quadrature component Q of the single-ended received baseband signal.
- the phase quantization unit 401 and the conversion selection unit 402 are , It is configured as follows.
- FIG. 24 is a diagram showing a configuration of a phase quantization unit (quadrant determination unit) in the receiver of FIG. For example, if the quantization resolution of the phase quantization unit 401 is 4 (2 bits), the phase quantization unit 401, as shown in FIG. Be composed.
- FIG. 25 is a diagram showing a configuration of a conversion selection unit (rotational projection unit) in the receiver shown in FIG. As shown in FIG. 25, the conversion selecting section 402 is composed of inverting amplifiers 2 1 2 and 2 13 and a selector 2 14.
- the comparators 210 and 211 compare the in-phase component I and the quadrature component Q of the received baseband signal with 0 to determine the sign and output 1-bit data. Also, The inverting amplifiers 2 1 2 and 2 1 3 respectively invert the signs of the in-phase component I and the quadrature component Q of the received baseband signal to obtain ⁇ 1, 1 Q. Then, each of the signals I, Q, —I, and I-Q is input to the selector 214, and based on the output code of the phase quantization unit 401 and the 1-bit quantizer 5, Or select one signal. In the receiver shown in Fig. 23 above, when the received baseband signal is a single-ended signal, there are the following problems.
- the baseband low-pass filters 305 and 306 and the amplifiers 307 and 308 that exist between the outputs of the mixers 301 and 302 and the input of the phase detection circuit 111
- common-mode noise or DC offset is added to the received baseband signal, it is difficult to remove it.
- common mode noise or DC offset is large, accurate phase cannot be detected.
- the gains of the inverting amplifiers 2 1 1 and 2 1 2 are not exactly 1 but 1 a (a ⁇ 1), the inputs of the selector 2 14 become I, Q, — a I,-a As Q, the phase cannot be detected accurately.
- FIG. 26 is a diagram showing a configuration of a receiver including a phase detection circuit according to the present invention.
- 3 2 1 and 3 2 2 are differential output mixers
- 3 2 5 and 3 2 6 are differential input / output low-pass filters
- 3 2 7 and 3 2 8 Is a differential input / output amplifier
- 12 is a differential input phase detection circuit.
- the differential input phase detection circuit 12 detects the phase from the in-phase component I and the quadrature component Q of the differential received baseband signal.
- the phase quantization unit 401 and the conversion selection unit 402 It is configured as follows.
- FIG. 27 is a diagram illustrating a configuration of a phase quantization unit (quadrant determination unit) in the receiver according to the ninth embodiment.
- the phase quantization unit 401 when the quantization resolution of the phase quantization unit 401 is 4 (2 bits), the phase quantization unit 401, as shown in FIG. It consists of.
- FIG. 28 is a diagram illustrating a configuration of a conversion selection unit (rotational projection unit) in the receiver according to the ninth embodiment.
- the conversion selecting section 402 is composed of selectors 222, 222, 226, and subtracters 222, 225.
- the comparator 220 generates a non-inverted signal for the in-phase component I of the received baseband signal.
- the sign is determined by comparing 1+ with the inverted signal I_, and 1-bit data is output.
- the comparator 221 compares the non-inverted signal Q + and the inverted signal Q— for the orthogonal component Q of the received baseband signal, determines the sign, and outputs 1-bit data.
- the selectors 222 and 223 subtract either the non-inverted signal (I + , Q +) or the inverted signal (I-, QJ) for the in-phase component I and the quadrature component Q of the received baseband signal, respectively.
- the power to be input to the minuend side of the units 2 24 and 2 25 and which power is input to the subtrahend side is selected based on the output code of the phase quantization unit 401 and the 1-bit quantizer 5.
- Subtractor 2 2 4 can be used to select one of I + — I— and I -— 1 +
- the selector 226 selects either the output of the subtractor 224 or the output of the subtractor 225 based on the output code of the phase quantizer 410 and the 1-bit quantizer 5. And output.
- the phase quantization unit 401 and the conversion selection unit 402 are configured differentially, the non-inverted component and the inverted component of the received baseband signal have the same amount. Even if in-phase noise or DC offset is added, they can cancel each other out and detect an accurate phase. Also, the accuracy of the gain of the inverting amplifier does not matter.
- the operation of the present embodiment has been described using the configuration of the phase quantization unit 401 and the transformation selection unit 402 as an example.
- the present invention is not limited to this. The same can be applied to a combination of 1 and the conversion selection unit 4 03, and a combination of the quadrant determination unit 101 and the rotation projection unit 102.
- FIG. 29 is a diagram showing a configuration of the demodulator 312 of the receiver shown in FIG.
- 13 is a timing reproducing section
- 14 is a data determining section
- 15 is an oscillator.
- a digital frequency modulation (FSK) or a phase modulation (PSK) receiver provided with the phase detection circuit according to the first to seventh embodiments, particularly, a phase detection circuit 11 and a demodulator 31 1 2 shows the configuration of FIG.
- the receiver usually detects the frequency and phase of the received signal at intervals of 1/8 or 1Z16 of the symbol clock, and searches for the appropriate data decision timing from among them. .
- the timing recovery unit 13 includes, for example, a clock 16 times the symbol clock oscillated by the oscillator 15 and a reception signal output by the phase detection circuit 11. Receives the phase information and, and searches for the data judgment timing with the resolution of 1/16 of the symbol clock from the phase of the received signal.
- the timing reproduction section 13 outputs a phase detection request timing signal to the phase detection circuit 11.
- This phase detection request timing signal is represented by, for example, a value of 0 to 15 and, from the start of reception, until the data determination timing is found, a value of 0 to 15 is provided for each 16 times the symbol clock. Output the value. After the data determination timing is found, for example, if the data determination timing is a phase 0 of 16 times the symbol clock, a value of 0 is output for each symbol clock.
- the adder 206 In the phase detection circuit 11, the adder 206, the comparison / determination unit 204, the multipliers 202-1 to 202-k, only at the phase detection request timing instructed by the timing recovery unit 13.
- the low-pass filter 2 of the phase detection circuit 11 ⁇ ⁇ is operated only at the phase detection request timing instructed by the timing recovery unit 13, so that the power consumption is reduced. Can be reduced.
- phase detection circuit 11 shown in FIG. 23 As an example.
- the present invention is not limited to this, and the phase detection circuit 12 shown in FIG. Applicable.
- the adding means performs addition modulo the quantized value of phase 2 ⁇
- the low-pass filter means outputs the phase 2 to the output of the shift register to be operated.
- phase data that crosses the quantized value of ⁇ appears
- the range of the phase data is converted from 0 to 2 ⁇ to ⁇ to 3 ⁇ , and the calculation is performed.
- the data range is returned to 0 to 2 ⁇ .
- the second quantization means determines the sign of the output of the integration means based on the determined area of the received signal and performs quantization.
- the configuration is such that conversion selection means output S and different output patterns are combined and output for each area. This has the effect of reducing the change in the output of the conversion selection means and making the detected phase value more accurate.
- the first quantization means, the conversion selection means, the integration means, the second quantization means, the delay means and the addition means constitute a delta-sigma modulator, low-pass There is an effect that a correct averaging result can be obtained by the filter means.
- the phase detection circuit is configured by a second-order or higher-order delta-sigma modulator.
- the power spectrum of the quantization noise becomes smaller at the low frequency side and becomes larger at the high frequency side, compared to the case where the phase detection circuit is configured by a first-order delta-sigma modulator. This has the effect of greatly improving the S / N ratio by removing the noise.
- the provision of the sample and hold circuit makes the output of the conversion selecting means constant during the operation of the delta-sigma modulator, so that a more accurate phase detection value can be obtained. To play.
- the adding means performs addition modulo the phase 2 ⁇
- the low-pass filter means displays phase data that crosses 2 ⁇ at the output of the shift register to be operated. Then, the range of the phase data was converted from 0 to 2 volts to vertices to 3 volts, the calculation was performed, and then the range of the phase data was returned to 0 to 2 ⁇ . As a result, a correct averaging result can be obtained, so that accurate phase detection can be realized.
- the quantization means determines the sign of the output of the integrator based on the determined quadrant of the received signal and performs quantization. That is, this phase detection circuit outputs different output patterns in combination for each quadrant. As a result, there is an effect that the change in the output of the rotation projection means is reduced, and the detected value of the phase becomes more accurate.
- the phase detection circuit is configured by a second-order or higher-order delta-sigma modulator.
- the power spectrum of the quantization noise is smaller on the low frequency side and larger on the high frequency side, compared to the case where the phase detection circuit is configured by a first-order delta-sigma modulator.
- the SN ratio can be significantly improved.
- the output of the rotation projecting means is constant, so that it is possible to obtain a more accurate phase detection value.
- a configuration is adopted in which a phase detection circuit that quantizes the ratio of the in-phase component I and the quadrature component Q of the received baseband signal is used. This has the effect of eliminating the need for AGC. Also, by using a phase detection device capable of realizing accurate phase detection, the distortion rate characteristics and the received bit error rate characteristics of the receiver can be greatly improved.
- the second quantization means determines the sign of the output of the integration means based on the determined quadrant of the received signal and performs quantization. That is, this phase detection circuit combines and outputs different output patterns for each quadrant. As a result, there is an effect that the change in the output of the conversion selecting means is reduced and the detected value of the phase becomes more accurate.
- the first quantizing means and the conversion selecting means are configured differentially, the same amount of common-mode noise and direct current as the non-inverted component and the inverted component of the received baseband signal are used. Even if an offset is added, it is possible to cancel each other out and detect an accurate phase.
- a configuration is employed in which a phase detection circuit is used to quantize the ratio between the in-phase component I and the quadrature component Q of the received baseband signal. This has the effect of eliminating the need for C. Also, by using a phase detection device capable of realizing accurate phase detection, the distortion rate characteristics and the received bit error rate characteristics of the receiver can be greatly improved.
- the quantization means determines the sign of the output of the integrator based on the determined quadrant of the received signal and performs quantization. That is, this phase detection circuit outputs different output patterns in combination for each quadrant. As a result, there is an effect that the change in the output of the rotation projection means is reduced, and the detected value of the phase becomes more accurate.
- the quadrant judging means and the rotation projecting means are constituted by differentials, the same amount of common mode noise or DC offset is added to the non-inverted and inverted components of the received baseband signal.
- the phases can be canceled out and an accurate phase can be detected.
- the phase detection circuit is configured by a second-order or higher delta-sigma modulator including a plurality of integrators.
- the power spectrum of the quantization noise is smaller on the low frequency side and larger on the high frequency side as compared with the case where the phase detection circuit is composed of a first-order delta-sigma modulator.
- the SN ratio can be greatly improved.
- the low-pass filter means in the phase detection circuit is operated only at the phase detection request timing instructed by the timing recovery means, so that the power consumption can be greatly reduced.
- the output of the rotation projecting means or the conversion selecting means becomes constant, so that it is possible to obtain a more accurate phase detection value.
- phase detection circuit and the receiver according to the present invention are suitable for detecting the phase of an FS.K or PSK signal in digital mobile communication.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02712350A EP1363433B1 (en) | 2001-02-19 | 2002-02-14 | Phase detection circuit and receiver |
US10/467,061 US6903603B2 (en) | 2001-02-19 | 2002-02-14 | Phase detection circuit and receiver |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001-042474 | 2001-02-19 | ||
JP2001042474 | 2001-02-19 | ||
JP2001-202664 | 2001-07-03 | ||
JP2001202664A JP3317964B1 (ja) | 2001-02-19 | 2001-07-03 | 位相検出回路および受信機 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002067522A1 true WO2002067522A1 (fr) | 2002-08-29 |
Family
ID=26609658
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/001244 WO2002067522A1 (fr) | 2001-02-19 | 2002-02-14 | Circuit de detection de phase et recepteur |
Country Status (5)
Country | Link |
---|---|
US (1) | US6903603B2 (ja) |
EP (1) | EP1363433B1 (ja) |
JP (1) | JP3317964B1 (ja) |
CN (1) | CN1493136A (ja) |
WO (1) | WO2002067522A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101207402B (zh) * | 2006-12-22 | 2011-05-18 | 联发科技股份有限公司 | 展频接收器中部分码片相关性计算装置及方法 |
Families Citing this family (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101576586B (zh) * | 2008-05-09 | 2010-12-22 | 中国科学院半导体研究所 | 一种基于自适应滤波的相位检测方法 |
GB2461921B (en) | 2008-07-18 | 2010-11-24 | Phasor Solutions Ltd | A phased array antenna and a method of operating a phased array antenna |
GB201215114D0 (en) | 2012-08-24 | 2012-10-10 | Phasor Solutions Ltd | Improvements in or relating to the processing of noisy analogue signals |
CN103888102B (zh) * | 2012-12-21 | 2018-02-16 | 上海大郡动力控制技术有限公司 | 车用电机系统信号处理方法 |
WO2015061617A1 (en) * | 2013-10-24 | 2015-04-30 | Marvell World Trade Ltd. | Cartesian digital power amplifier using coordinate rotation |
US9800272B2 (en) * | 2013-12-20 | 2017-10-24 | Texas Instruments Incorporated | Circuits and methods for transmitting signals |
CN106576087B (zh) | 2014-08-01 | 2019-04-12 | 康杜实验室公司 | 带内嵌时钟的正交差分向量信令码 |
US10055372B2 (en) | 2015-11-25 | 2018-08-21 | Kandou Labs, S.A. | Orthogonal differential vector signaling codes with embedded clock |
CN109314518B (zh) | 2016-04-22 | 2022-07-29 | 康杜实验室公司 | 高性能锁相环 |
US10193716B2 (en) | 2016-04-28 | 2019-01-29 | Kandou Labs, S.A. | Clock data recovery with decision feedback equalization |
US9906358B1 (en) | 2016-08-31 | 2018-02-27 | Kandou Labs, S.A. | Lock detector for phase lock loop |
US10411922B2 (en) | 2016-09-16 | 2019-09-10 | Kandou Labs, S.A. | Data-driven phase detector element for phase locked loops |
US10200188B2 (en) | 2016-10-21 | 2019-02-05 | Kandou Labs, S.A. | Quadrature and duty cycle error correction in matrix phase lock loop |
US10693473B2 (en) | 2017-05-22 | 2020-06-23 | Kandou Labs, S.A. | Multi-modal data-driven clock recovery circuit |
US10203226B1 (en) | 2017-08-11 | 2019-02-12 | Kandou Labs, S.A. | Phase interpolation circuit |
US10347283B2 (en) * | 2017-11-02 | 2019-07-09 | Kandou Labs, S.A. | Clock data recovery in multilane data receiver |
US10554380B2 (en) | 2018-01-26 | 2020-02-04 | Kandou Labs, S.A. | Dynamically weighted exclusive or gate having weighted output segments for phase detection and phase interpolation |
EP3807996B1 (en) | 2018-06-12 | 2022-07-06 | Kandou Labs SA | Low latency combined clock data recovery logic network and charge pump circuit |
US10673443B1 (en) | 2019-04-08 | 2020-06-02 | Kandou Labs, S.A. | Multi-ring cross-coupled voltage-controlled oscillator |
US10630272B1 (en) | 2019-04-08 | 2020-04-21 | Kandou Labs, S.A. | Measurement and correction of multiphase clock duty cycle and skew |
US10958251B2 (en) | 2019-04-08 | 2021-03-23 | Kandou Labs, S.A. | Multiple adjacent slicewise layout of voltage-controlled oscillator |
US11463092B1 (en) | 2021-04-01 | 2022-10-04 | Kanou Labs Sa | Clock and data recovery lock detection circuit for verifying lock condition in presence of imbalanced early to late vote ratios |
US11563605B2 (en) | 2021-04-07 | 2023-01-24 | Kandou Labs SA | Horizontal centering of sampling point using multiple vertical voltage measurements |
US11496282B1 (en) | 2021-06-04 | 2022-11-08 | Kandou Labs, S.A. | Horizontal centering of sampling point using vertical vernier |
CN116539956A (zh) * | 2022-01-26 | 2023-08-04 | 深圳市紫光同创电子有限公司 | 相位检测方法及装置 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0677737A (ja) * | 1992-07-08 | 1994-03-18 | Toshiba Corp | 位相検波器及びこれに用いる位相検波方式 |
JPH0897875A (ja) * | 1994-09-28 | 1996-04-12 | Toshiba Corp | 位相検出回路 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3003826B2 (ja) * | 1992-12-11 | 2000-01-31 | 三菱電機株式会社 | クロック再生回路 |
US6775530B2 (en) * | 2001-11-27 | 2004-08-10 | Qualcomm Inc. | Direct conversion of narrow-band RF signals |
-
2001
- 2001-07-03 JP JP2001202664A patent/JP3317964B1/ja not_active Expired - Lifetime
-
2002
- 2002-02-14 EP EP02712350A patent/EP1363433B1/en not_active Expired - Lifetime
- 2002-02-14 WO PCT/JP2002/001244 patent/WO2002067522A1/ja active Application Filing
- 2002-02-14 US US10/467,061 patent/US6903603B2/en not_active Expired - Lifetime
- 2002-02-14 CN CNA028051831A patent/CN1493136A/zh active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0677737A (ja) * | 1992-07-08 | 1994-03-18 | Toshiba Corp | 位相検波器及びこれに用いる位相検波方式 |
JPH0897875A (ja) * | 1994-09-28 | 1996-04-12 | Toshiba Corp | 位相検出回路 |
Non-Patent Citations (4)
Title |
---|
HAYASHI RYOJI ET AL.: "delta sigma Iso kenshutsuki niyoru PSK/FSK singo no jusin tokusei", GIJUTSU KENKYU HOKOU RCS 2001-203-224, THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION, vol. 101, no. 544, January 2002 (2002-01-01), pages 151 - 158, XP002909352 * |
HAYASHI RYOJI ET AL.: "xi-delta Gata iso kenshutsuki niyoru PSK/FSK singo no jushin tokusei", NATIONAL CONVENTION RECORD, THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION, 2 TSUSHIN ELECTRONICS, vol. 2001, March 2001 (2001-03-01), pages 569, XP002909351 * |
HAYASHIBARA MIKIO ET AL.: "xi-delta Hencho gijutsu o mochiita iso kensyutsu hosiki to FM fukuchoki heno oyo", SHUNKI CONVENTION RECORD, THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION, 2 TSUSHIN ELECTRONICS, vol. 1994, March 1994 (1994-03-01), pages 2-368, XP002909350 * |
See also references of EP1363433A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101207402B (zh) * | 2006-12-22 | 2011-05-18 | 联发科技股份有限公司 | 展频接收器中部分码片相关性计算装置及方法 |
Also Published As
Publication number | Publication date |
---|---|
JP3317964B1 (ja) | 2002-08-26 |
EP1363433A1 (en) | 2003-11-19 |
US20040092240A1 (en) | 2004-05-13 |
EP1363433A4 (en) | 2009-12-30 |
CN1493136A (zh) | 2004-04-28 |
JP2002319987A (ja) | 2002-10-31 |
EP1363433B1 (en) | 2012-04-11 |
US6903603B2 (en) | 2005-06-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2002067522A1 (fr) | Circuit de detection de phase et recepteur | |
JPS60112344A (ja) | 無線受信機及び復調方法 | |
JPH0983588A (ja) | 復調器及び変復調システム及び復調方法 | |
GB2225680A (en) | Complex digital sampling converter for demodulator | |
JPH06284159A (ja) | ディジタル復調器 | |
JPH11284677A (ja) | 復調器とこれを用いたディジタル無線通信システム | |
JPH0823231A (ja) | Fm変調回路 | |
JPH0621992A (ja) | 復調器 | |
JPH1075122A (ja) | Fm信号復調方法及びその装置 | |
JPH05183592A (ja) | 周波数変換回路、位相比較回路、およびこれらを備えた遅延検波復調装置 | |
JPH10271178A (ja) | π/nシフトPSK復調器 | |
JPH11331291A (ja) | 自動利得制御方法および自動利得制御を備えた復調装置 | |
JP4272997B2 (ja) | 入力バースト信号に含まれる付加的dc成分を検出する回路 | |
JP4288489B2 (ja) | イメージ信号キャンセル型ヘテロダイン受信方式およびダイレクトコンバージョン直交周波数分割多重受信方式 | |
JP3873078B2 (ja) | タイミング抽出装置及び方法並びにそのタイミング抽出装置を備えた復調装置 | |
JP2000151732A (ja) | キャリア位相推定装置とキャリア位相推定装置を用いた復調器 | |
JP4641927B2 (ja) | Fsk復調回路 | |
JP2853728B2 (ja) | ディジタル復調回路 | |
JP3152358B2 (ja) | 周波数制御回路 | |
JP2929366B2 (ja) | デジタルam復調器とその方法 | |
JP2705542B2 (ja) | 周波数誤差検出装置 | |
JPH05304542A (ja) | 復調方法及び復調器 | |
JP2007129595A (ja) | Fsk復調回路 | |
JP2005006159A (ja) | 位相検出回路および受信機 | |
JPS62142441A (ja) | 位相同期回路 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): CN KR US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2002712350 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10467061 Country of ref document: US Ref document number: 028051831 Country of ref document: CN |
|
WWP | Wipo information: published in national office |
Ref document number: 2002712350 Country of ref document: EP |