WO2015139293A1 - 一种信号处理的方法、装置及系统 - Google Patents

一种信号处理的方法、装置及系统 Download PDF

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Publication number
WO2015139293A1
WO2015139293A1 PCT/CN2014/073828 CN2014073828W WO2015139293A1 WO 2015139293 A1 WO2015139293 A1 WO 2015139293A1 CN 2014073828 W CN2014073828 W CN 2014073828W WO 2015139293 A1 WO2015139293 A1 WO 2015139293A1
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Prior art keywords
signal
aliasing
band
sub
converted
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PCT/CN2014/073828
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English (en)
French (fr)
Inventor
孔翔鸣
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2014/073828 priority Critical patent/WO2015139293A1/zh
Priority to CN201480076228.7A priority patent/CN106031047B/zh
Priority to EP14886076.0A priority patent/EP3110014B1/en
Publication of WO2015139293A1 publication Critical patent/WO2015139293A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06Receivers
    • H04B1/16Circuits
    • H04B1/30Circuits for homodyne or synchrodyne receivers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06Receivers
    • H04B1/16Circuits
    • H04B1/26Circuits for superheterodyne receivers
    • H04B1/28Circuits for superheterodyne receivers the receiver comprising at least one semiconductor device having three or more electrodes

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a signal processing method, apparatus, and system. Background technique
  • the receiving end of the communication system After receiving the signal, the receiving end of the communication system sends the received signal as an input signal to the local oscillator signal with the same carrier frequency for mixing, and down-converts the input signal to the baseband signal before sampling. deal with.
  • the input signal is composed of a plurality of narrowband signals having different carrier frequencies
  • the receiving end needs to separately perform mixed sampling for each narrowband signal, that is, the receiving end needs to have multiple parallel receiving paths, and each channel receives a narrowband signal.
  • the frequency of the local oscillator signal in the path is the same as the carrier frequency of the received signal, and the cutoff frequency of the low pass filter and the sampling frequency of the analog to digital converter are also set according to the bandwidth of the received signal.
  • the complexity of the receiver RF front-end circuit increases as the number of signals increases.
  • a Modulated Wideband Converter is a sequence demodulation receiver that is mainly used to receive multi-band signals. It uses a periodic random sequence to generate a mixed signal. Such a random sequence is composed of many equally spaced discrete resonant frequency points in the frequency domain. The clock speed at which the random sequence is generated determines the highest frequency of the resonant frequency, that is, the MWC. Bandwidth that can be supported. The entire RF bandwidth supported by the MWC can be divided into M subbands, the bandwidth of the subbands is, and the center of each subband corresponds to a resonance frequency of the random sequence. Due to the use of compressed sensing technology, unlike conventional receivers, it allows the narrowband signals to be aliased together after mixing, and then separates the sampling points of each signal by an algorithm.
  • MWC Modulated Wideband Converter
  • the inventors of the present invention have found that in the prior art, when the MWC processing signal process uses the local oscillator signal generated by the random sequence for mixing, the signals in each sub-band are moved to the baseband aliasing.
  • the input signal is composed of a dispersed narrowband signal, there are some subbands without any useful signal.
  • the noise and interference signals contained in these sub-bands are also shifted to the baseband and the wanted signal during mixing, resulting in a lower signal-to-noise ratio for later recovery.
  • Embodiments of the present invention provide a method for signal processing, where there are multiple different frequencies in a signal to be down-converted
  • the signal to be down-converted is only mixed with the harmonic signal at the center of the sub-band where the spectral component is located, and the signal-to-noise ratio of the mixed-mixed signal can be improved.
  • the embodiments of the present invention also provide corresponding devices and systems.
  • a first aspect of the present invention provides a signal processing method, including:
  • the signal generating device generates a preset-sized harmonic signal only at the center of the sub-band where the spectral component is located;
  • the method when the determining the frequency component of the to-be-converted signal in the pre-divided position information in the sub-band, the method further includes:
  • the aliasing mode Determining the type of aliasing mode and the number of aliasing signals included in each of the aliasing modes, the aliasing mode being used to describe the case of aliased signals contained in different frequency bands;
  • a measurement matrix for describing the mixing and analog-to-digital conversion sampling process is determined according to the number of the pre-divided sub-bands and the number of aliasing signals included in each of the aliasing modes.
  • the number of the pre-divided sub-bands and the aliasing signal included in each of the aliasing modes are Number, determines the measurement matrix used to describe the mixing and analog-to-digital conversion sampling process, including:
  • the number of rows of the measurement matrix is determined according to the number of aliasing signals included in the aliasing mode including the largest number of aliasing signals.
  • the method further includes:
  • a mode measurement matrix corresponding to each of the aliasing modes Determining, according to the number of aliasing signals included in each of the aliasing modes and the measurement matrix, a mode measurement matrix corresponding to each of the aliasing modes, the mode measurement matrix being a pattern-based aliasing signal
  • the position information of the subband in which the spectral component corresponding to the number is located corresponds to the submatrix formed by the column of the measurement matrix, and the mode aliasing signal is the aliasing signal included in each of the aliasing modes.
  • the method further includes:
  • the initial subband set is a set of location information of a subband in which the spectral component is located;
  • new subband position information is added to the initial subband set, and the non-column rank matrix is adjusted to a full rank matrix.
  • the full rank matrix is adjusted to be a full rank matrix, including:
  • a mode measurement matrix of the aliasing mode, the non-column rank matrix is adjusted to a column full rank matrix.
  • the determining, according to the location information of the spectral component in the pre-divided sub-band, determining the signal to be down-converted a spectrum support sequence of the local oscillator signal, wherein the spectrum support sequence of the local oscillator signal is used to indicate that the local oscillator signal generating device generates a preset-sized harmonic signal only at a center of the sub-band where the spectral component is located including:
  • the spectrum support sequence is used to indicate that the local oscillator signal generating device generates a preset-sized harmonic signal only at the center of the sub-band where the spectral component is located and at the center of the sub-band indicated by the new sub-band position information;
  • a second aspect of the present invention provides a signal processing apparatus, including:
  • a first determining unit configured to determine position information of a spectral component of the signal to be down-converted in a pre-divided sub-band, wherein a bandwidth of the pre-divided sub-band depends on a period of a local oscillator signal used for mixing;
  • a second determining unit configured to determine a spectrum support sequence of the local oscillator signal corresponding to the to-be-converted signal according to position information of the spectral component determined by the first determining unit in the pre-divided sub-band a spectrum support sequence of the local oscillator signal is used to indicate that the local oscillator signal generating device generates a preset-sized harmonic signal only at a center of the sub-band where the spectral component is located;
  • a mixing unit configured to mix the to-be-converted signal with the harmonic signal corresponding to the spectral component determined by the second determining unit to obtain a down-converted signal.
  • the apparatus further includes: a third determining unit, configured to determine, in the first determining unit, a spectral component of the signal to be down-converted in a pre-divided sub-band In the position information, determine the type of the aliasing mode, and the number of aliasing signals included in each of the aliasing modes, which are used to describe the aliasing signals included in different frequency bands. ;
  • a fourth determining unit configured to determine, according to the number of the pre-divided sub-bands and the number of aliasing signals included in each of the aliasing modes determined by the third determining unit, And the measurement matrix of the analog-to-digital conversion sampling process.
  • the fourth determining unit is configured to determine, according to the number of the pre-divided sub-bands, the number of columns of the measurement matrix The number of rows of the measurement matrix is determined according to the number of aliasing signals included in the aliasing mode including the largest number of aliasing signals.
  • the apparatus further includes:
  • a fifth determining unit configured to determine, according to the number of the aliasing signals included in each of the aliasing modes determined by the third determining unit, and the measurement matrix determined by the fourth determining unit, a mode measurement matrix for each aliasing mode, the mode measurement matrix being corresponding to the mode aliasing signal
  • the position information of the sub-band in which the spectral component is located corresponds to a sub-matrix formed by the columns of the measurement matrix, and the mode aliasing signal is an aliasing signal included in each of the aliasing modes.
  • the device further includes:
  • a sixth determining unit configured to determine, according to the initial set of subbands, a non-column rank matrix in the mode measurement matrix determined by the fifth determining unit, where the initial subband set is a subband of the spectral component a collection of location information;
  • an adjusting unit configured to add new subband location information to the initial subband set according to a preset policy, and adjust the non-column rank matrix determined by the sixth determining unit to a full rank matrix.
  • the adjusting unit is configured to determine, according to a preset policy, the new subband location that is added to the initial subband set. And re-determining the mode measurement matrix of each of the aliasing modes according to the new subband position information and the location information of the subband in which the spectral component is located, and adjusting the non-column rank matrix to a full rank matrix.
  • the second determining unit configured to use, according to location information of the spectral component in the pre-divided sub-band, a new subband position information, a spectrum support sequence corresponding to the local oscillator signal of the to-be-converted signal is determined, and a spectrum support sequence of the local oscillator signal is used to indicate that the local oscillator signal generating device is only in the spectral component Generating a preset-sized harmonic signal at the center of the sub-band and at the center of the sub-band indicated by the new sub-band position information;
  • the mixing unit is configured to perform the to-be-converted signal, the harmonic signal corresponding to the spectral component, and the harmonic signal at a sub-band indicated by the new sub-band position information. Mixing, the downconverted signal is obtained.
  • a third aspect of the present invention provides a signal receiver comprising: an input device, an output device, a memory, and a processor,
  • the processor is configured to perform the following steps:
  • the signal generating device generates a preset-sized harmonic signal only at the center of the sub-band where the spectral component is located;
  • a fourth aspect of the present invention provides a signal receiving system, including: an antenna, a signal processing device, and a local oscillator signal generating device;
  • the antenna is configured to receive the signal to be down-converted
  • the signal processing device is configured to determine position information of a spectral component of the signal to be down-converted in a pre-divided sub-band, and the bandwidth of the pre-divided sub-band depends on a period of a local oscillator signal used for mixing, according to Determining, by the position information of the spectral component in the pre-divided sub-band, a spectrum support sequence corresponding to the local oscillator signal of the to-be-converted signal, where a spectrum support sequence of the local oscillator signal is used to indicate a local oscillator signal generation
  • the apparatus generates a preset-sized harmonic signal only at a center of the sub-band where the spectral component is located; the local oscillator signal generating means is configured to generate a preset-sized harmonic at a center of the sub-band where the spectral component is located Signal and sent to the signal processing device;
  • the signal processing device is further configured to mix the to-be-converted signal with the harmonic signal corresponding to the spectral component to obtain a down-converted signal.
  • the embodiment of the present invention first determines location information of a spectral component of a signal to be down-converted in a pre-divided sub-band, and a bandwidth of the pre-divided sub-band depends on a period of a local oscillator signal used for mixing, according to the spectral component.
  • the to-be-converted signal is only mixed with the harmonic signal at the center of the sub-band where the spectral component is located, thereby improving the signal-to-noise ratio of the mixed-mixed signal.
  • FIG. 1 is a schematic diagram of an embodiment of a method for signal processing in an embodiment of the present invention
  • FIG. 2 is a schematic diagram of another embodiment of a method for signal processing in an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of another embodiment of a method for signal processing in an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of another embodiment of a method for signal processing in an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of another embodiment of a method for signal processing according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of an embodiment of an apparatus for signal processing in an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of another embodiment of an apparatus for signal processing in an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of another embodiment of an apparatus for signal processing in an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of another embodiment of an apparatus for signal processing according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of an embodiment of a signal receiver according to an embodiment of the present invention.
  • FIG. 11 is a schematic diagram of an embodiment of a signal receiving system in an embodiment of the present invention.
  • the embodiment of the invention provides a signal processing method.
  • the sub-band to be down-converted signal only has its spectral component.
  • the harmonic signals at the center are mixed to improve the signal-to-noise ratio of the aliased signals after mixing.
  • the embodiments of the present invention also provide corresponding devices and systems. The details are described below separately.
  • an embodiment of a method for signal processing provided by an embodiment of the present invention includes:
  • the signal to be down-converted in the embodiment of the present invention may include a plurality of narrowband signals having different frequency bands.
  • FIG. 2 is a signal to be down-converted in the embodiment of the present invention, and the signal to be down-converted includes four
  • the signals of different frequency bands are ⁇ to, f 21 to f 22 , f 31 to f 32 , ⁇ to, the frequency spectrum components of the signals in the four frequency bands can be determined by transforming in the time domain and the frequency domain, assuming that the whole is receivable
  • the RF range can be divided into 15 subbands, the middlemost subband can be identified as 0, the left side is negative, represented by consecutive negative integers, and the right is positive, represented by consecutive positive integers.
  • Figure 3 shows the positional distribution of the spectral components of the signals in the four bands in the sub-band.
  • the signals of the four bands are distributed in five sub-bands with spectral components.
  • the sub-band position numbers are -6, -3, -2, 1, and 4, respectively, that is, the positional information of the spectral components of the signal to be down-converted in the pre-divided sub-bands are -6, -3, -2, 1, respectively. 4.
  • the local oscillator signal generating means generates a preset-sized harmonic signal only at the center of the sub-band where the spectral component is located.
  • FIG. 4 is a position of a harmonic signal generated for a signal distributed in five sub-bands in FIG. 3, that is, a pre-sized harmonic signal is generated at the center of the sub-band where the spectral component is located.
  • the harmonic signal is represented by 1 and no harmonic signal is represented by 0.
  • the spectrum support sequence of the local oscillator signal corresponding to FIG. 4 can be expressed as (0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0), then the local oscillator
  • the signal generating device generates a pre-sized harmonic signal at a position identified as 1 in the sequence.
  • FIG. 5 is a schematic diagram of the down-converted signals after the four different frequency bands of the five sub-bands are mixed with the five local oscillator signals in FIG.
  • the embodiment of the present invention determines location information of a spectral component of a signal to be down-converted in a pre-divided sub-band, and the bandwidth of the pre-divided sub-band depends on a period of a local oscillator signal used for mixing, according to the spectral component.
  • the to-be-converted signal is only mixed with the harmonic signal at the center of the sub-band where the spectral component is located, thereby improving the signal-to-noise ratio of the mixed-mixed signal.
  • the method when determining the location information of the spectral component to be down-converted in the pre-divided sub-band, may further include:
  • the aliasing mode Determining the type of aliasing mode and the number of aliasing signals included in each of the aliasing modes, the aliasing mode being used to describe the case of aliased signals contained in different frequency bands;
  • a measurement matrix for describing the mixing and analog-to-digital conversion sampling process is determined according to the number of the pre-divided sub-bands and the number of aliasing signals included in each of the aliasing modes.
  • the determining the measurement matrix according to the number of the pre-divided sub-bands and the number of the aliasing signals included in each of the aliasing modes may include:
  • the number of rows of the measurement matrix is determined according to the number of aliasing signals included in the aliasing mode including the largest number of aliasing signals.
  • the aliasing mode is used to describe the case of the aliased signals included in different frequency ranges.
  • the sub-bands with the signals are guaranteed to have corresponding harmonic signals.
  • the number of harmonic signals only affects the noise and does not affect the distribution of the aliased signal. Therefore, the type of aliasing mode can be determined before mixing, and the number of aliasing signals included in each aliasing mode.
  • each sub-band signal is represented by an identifier, as shown in FIG. 5, a colorless circle, a black circle, and none. Color squares, black squares The five types of black triangles identify the signals of the five sub-bands.
  • the input signals of these four bands will have 9 aliasing modes after aliasing.
  • Each aliasing mode in Figure 5 is separated by a dotted line, from left to right.
  • the first aliasing mode contains the colorless circle.
  • One signal, the second aliasing mode includes two signals identified by the colorless circle and the colorless square, and the third aliasing mode includes three colors identified by the colorless circle, the colorless square, and the black circle.
  • the signal, the fourth aliasing mode includes two signals identified by the colorless square and the black circle
  • the fifth aliasing mode includes a signal identified by a black circle
  • the sixth aliasing mode includes a black circle and
  • the seventh aliasing mode includes a signal identified by a black triangle
  • the eighth aliasing mode includes two signals identified by black triangles and black squares
  • the ninth aliasing mode includes A signal identified by a black square.
  • the useful signals are aliased at the baseband during the mixing process.
  • the process of separating the aliased signals is actually a process of solving the original signal by the inverse matrix.
  • the measurement matrix describing the process of mixing the samples to obtain the baseband sampling signals must be To satisfy the full rank.
  • is the discrete Fourier transform of the sample point
  • ⁇ (/) is the vector of the sub-band segmentation of the spectrum of the down-converted signal
  • is the measurement matrix
  • Subband division can be expressed as a vector:
  • the general measurement matrix A has 15 columns, numbered from 15 integers from -7 to +7, in the above 9 aliasing modes, There are three signals in the third aliasing mode with the most aliasing signals, so the general measurement matrix A has 3 rows, the middle row is marked from -7 to +7, the upper row moves to the right by one column, and the lower row moves to the left by one column. If the measurement matrix should be 5 lines or other lines, it will also move in this way.
  • the general measurement matrix A thus obtained is as follows: 0
  • the method may further include:
  • a mode measurement matrix corresponding to each of the aliasing modes Determining, according to the number of aliasing signals included in each of the aliasing modes and the measurement matrix, a mode measurement matrix corresponding to each of the aliasing modes, wherein the mode measurement matrix is based on a mode aliasing signal
  • the position information of the subband in which the corresponding spectral component is located corresponds to a sub-matrix formed by the columns of the measurement matrix, and the mode aliasing signal is an aliasing signal included in each of the aliasing modes.
  • the method may further include:
  • the initial subband set is a set of location information of a subband in which the spectral component is located;
  • new subband position information is added to the initial subband set, and the non-column rank matrix is adjusted to a full rank matrix.
  • the new subband position information is added to the initial subband set according to the preset policy, and the non-column rank matrix is adjusted to be a full rank matrix, including:
  • a mode measurement matrix of the aliasing mode, the non-column rank matrix is adjusted to a column full rank matrix.
  • the matrix in each mode must be a full rank matrix. Therefore, it is necessary to adjust ⁇ 3 , ⁇ 4 to a full rank matrix, and how to adjust, in the embodiment of the present invention.
  • the solution provided is to introduce new subband position information in the initial subband set, and then adjust the non-column rank matrix to become a full rank matrix using the subband set after adding the new subband position information.
  • the conditions for selecting new subband position information are:
  • the selected subband should increase the rank of the most matrix columns, and should affect the matrix whose column rank cannot be increased as much as possible, so as not to increase the condition number of those matrices.
  • the parameters such as the width of the frequency band covered by each matrix can be selected as weights. Repeat this process until all the matrices have reached the full rank. In our case, 4 ⁇ is obvious. If you add -5 to ⁇ , then all matrices can reach the full rank.
  • the harmonic signal of the size can include:
  • Position information in the pre-divided sub-band and the new sub-band position according to the spectral component Determining, by the information, a spectrum support sequence of the local oscillator signal corresponding to the signal to be down-converted, wherein the spectrum support sequence of the local oscillator signal is used to indicate that the local oscillator signal generating device is only at the center of the sub-band where the spectral component is located And generating a preset size harmonic signal at a center of the subband indicated by the new subband position information;
  • the determined minimum subband set is added to the base of the initial subband set, and the new subband location information-5 is added.
  • the spectrum support sequence of the local oscillator signal needs to be adjusted, and the spectrum support sequence of the original local oscillator signal can be expressed as (0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0). , 1, 0, 0, 0), adjusted to (0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0), so that the local oscillator signal is generated
  • the device will also generate a preset-sized harmonic signal at the center of the sub-band of -5.
  • an embodiment of the apparatus 20 for signal processing includes: a first determining unit 201, configured to determine location information of a spectral component of a signal to be down-converted in a pre-divided sub-band, the pre-predetermined The bandwidth of the divided sub-bands depends on the period of the local oscillator signal used for mixing;
  • a second determining unit 202 configured to determine, according to the location information of the spectral component in the pre-divided subband determined by the first determining unit 201, a spectrum of the local oscillator signal corresponding to the signal to be down-converted a support sequence, the spectrum support sequence of the local oscillator signal is used to indicate that the local oscillator signal generating device generates a preset-sized harmonic signal only at a center of the sub-band where the spectral component is located;
  • the mixing unit 203 is configured to mix the to-be-converted signal with the harmonic signal corresponding to the spectral component determined by the second determining unit 202 to obtain a down-converted signal.
  • the first determining unit 201 determines location information of a spectral component of the signal to be down-converted in a pre-divided sub-band, and the bandwidth of the pre-divided sub-band depends on a period of a local oscillator signal used for mixing.
  • the second determining unit 202 determines the spectrum branch of the local oscillator signal corresponding to the signal to be down-converted according to the position information of the spectral component determined by the first determining unit 201 in the pre-divided sub-band And a spectrum support sequence of the local oscillator signal is used to indicate that the local oscillator signal generating device generates a preset-sized harmonic signal only at a center of the sub-band where the spectral component is located, and the mixing unit 203 will And converting the frequency-converted signal to the harmonic signal corresponding to the spectral component determined by the second determining unit 202 to obtain a down-converted signal.
  • the signal to be down-converted is only mixed with the harmonic signal at the center of the sub-band where the spectral component is located, thereby improving the signal-to-noise ratio of the mixed-mixed signal.
  • the apparatus 20 further includes:
  • a third determining unit 204 configured to determine, when the first determining unit 201 determines the position information of the spectral component of the signal to be down-converted in the pre-divided sub-band, the type of the aliasing mode, and each of the aliasing modes The number of aliasing signals included in the aliasing mode used to describe the aliasing signals contained in different frequency bands;
  • a fourth determining unit 205 configured to determine, according to the number of the pre-divided sub-bands, the third determining unit
  • the number of aliasing signals included in each of the aliasing modes determined by 204 determines a measurement matrix for describing the mixing and analog to digital conversion sampling process.
  • the fourth determining unit 205 is configured to determine, according to the number of the pre-divided sub-bands, the number of columns of the measurement matrix, according to an alias signal included in an aliasing mode that includes the largest number of aliasing signals. Number, determining the number of rows of the measurement matrix.
  • the apparatus 20 further includes:
  • a fifth determining unit 206 configured to determine, according to the number of aliasing signals included in each of the aliasing modes determined by the third determining unit 204, and the measurement matrix determined by the fourth determining unit 205, Determining a mode measurement matrix corresponding to each of the aliasing modes, where the mode measurement matrix is position information of a subband in which a spectral component corresponding to the mode aliasing signal is located, and a sub-port formed by the column of the measurement matrix a matrix, the mode aliasing signal being an aliased signal included in each of the aliasing modes.
  • the apparatus 20 further includes:
  • a sixth determining unit 207 configured to determine, according to the initial set of subbands, a non-column rank matrix in the mode measurement matrix determined by the fifth determining unit 206, where the initial subband set is a sub a collection of location information;
  • the adjusting unit 208 is configured to add new subband location information to the initial subband set according to a preset policy, and adjust the non-column rank matrix determined by the sixth determining unit 207 to a full rank matrix. .
  • the adjusting unit 208 is configured to determine, according to a preset policy, the new subband location information that is added to the initial subband set, according to the new subband location information and a location of the subband where the spectral component is located Information, re-determining the mode measurement matrix of each of the aliasing modes, and adjusting the non-column rank matrix to a full rank matrix.
  • the second determining unit 202 is configured to determine, according to the location information of the spectral component in the pre-divided subband and the new subband location information, the local oscillator signal corresponding to the to-be-converted signal. a spectrum support sequence, the spectrum support sequence of the local oscillator signal is used to indicate that the local oscillator signal generating device generates only at the center of the subband where the spectral component is located and at the center of the subband indicated by the new subband position information Preset size harmonic signal;
  • FIG. 10 is a schematic structural diagram of a signal receiver 200 according to an embodiment of the present invention.
  • Signal receiver 200 can include input device 210, output device 220, processor 230, and memory 240.
  • Memory 240 can include read only memory and random access memory and provides instructions and data to processor 230.
  • a portion of memory 240 may also include non-volatile random access memory (NVRAM).
  • NVRAM non-volatile random access memory
  • Memory 240 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set of them:
  • Operation instructions Includes various operation instructions for implementing various operations.
  • Operating System Includes a variety of system programs for implementing basic services and handling hardware-based tasks.
  • the processor 230 performs the following operations by calling an operation instruction stored in the memory 240 (the operation instruction can be stored in the operating system):
  • the signal generating device generates a preset-sized harmonic signal only at the center of the sub-band where the spectral component is located;
  • the signal receiver 200 has a plurality of signals of different frequency bands in the signal to be down-converted, and when mixed by a mixing channel, the signal-to-noise ratio of the mixed-mixed signals can be improved.
  • the processor 230 controls the operation of the signal receiver 200, which may also be referred to as a CPU (Central Processing Unit).
  • Memory 240 can include read only memory and random access memory and provides instructions and data to processor 230. A portion of memory 240 may also include non-volatile random access memory (NVRAM).
  • NVRAM non-volatile random access memory
  • the various components of the signal receiver 200 are coupled together by a bus system 250, which may include, in addition to the data bus, a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 250 in the figure.
  • Processor 230 may be an integrated circuit chip with signal processing capabilities.
  • the instruction in the form of the implementation is completed.
  • the processor 230 described above may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware. Component.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA off-the-shelf programmable gate array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or executed.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 240.
  • the processor 230 reads the information in the memory 240 and completes the steps of the above method in combination with its hardware.
  • the processor 230 may specifically determine the type of the aliasing mode and the number of aliasing signals included in each of the aliasing modes, and the aliasing mode is used to describe the aliasing included in different frequency bands.
  • a measurement matrix for describing a mixing and analog-to-digital conversion sampling process is determined according to the number of pre-divided sub-bands and the number of aliasing signals included in each of the aliasing modes.
  • the processor 230 may determine, according to the number of the pre-divided sub-bands, the number of columns of the measurement matrix, according to the number of alias signals included in the aliasing mode that includes the largest number of aliasing signals. , determining the number of rows of the measurement matrix.
  • the processor 230 may determine, according to the number of aliasing signals included in each of the aliasing modes and the measurement matrix, a mode measurement matrix corresponding to each of the aliasing modes, where the mode The measurement matrix is position information of a sub-band according to a spectral component corresponding to the mode aliasing signal, and corresponds to a sub-matrix formed by the column of the measurement matrix, where the mode aliasing signal is included in each of the aliasing modes The aliasing signal.
  • the processor 230 may specifically determine, according to the initial set of subbands, a non-column rank matrix in the mode measurement matrix, where the initial subband set is a set of location information of a subband in which the spectral component is located, according to a preset policy, adding new subband position information to the initial subband set, and adjusting the non-column rank matrix to a full rank matrix.
  • the processor 230 may specifically determine, according to a preset policy, the new subband location information that is added to the initial subband set, according to the new subband location information and the subband of the spectral component. Position information, re-determining the mode measurement matrix of each of the aliasing modes, and adjusting the non-column rank matrix to a full rank matrix.
  • the processor 230 may determine, according to the location information of the spectral component in the pre-divided subband and the new subband location information, the local oscillator signal corresponding to the to-be-converted signal. a spectrum support sequence, wherein the spectrum support sequence of the local oscillator signal is used to indicate that the local oscillator signal generating device generates the pre-determination only at the center of the sub-band where the spectral component is located and at the center of the sub-band indicated by the new sub-band position information a harmonic signal of a size, mixing the signal to be down-converted with the harmonic signal corresponding to the spectral component, and the harmonic signal at a sub-band indicated by the new sub-band position information Frequency, the down converted signal is obtained.
  • an embodiment of a signal receiving system includes an antenna 10, a signal processing device 20, and a local oscillator signal generating device 30;
  • the antenna 10 is configured to receive the signal to be down-converted
  • the signal processing device 20 is configured to determine position information of a spectral component of the signal to be down-converted in a pre-divided sub-band, and the bandwidth of the pre-divided sub-band depends on a period of a local oscillator signal used for mixing, according to Determining, by the position information of the spectral component in the pre-divided sub-band, a spectrum support sequence corresponding to the local oscillator signal of the to-be-converted signal, where a spectrum support sequence of the local oscillator signal is used to indicate a local oscillator signal Generating means generating a pre-sized harmonic signal only at the center of the sub-band where the spectral component is located; said local oscillator signal generating means 30 for generating a preset size at the center of the sub-band where the spectral component is located a harmonic signal, and sent to the signal processing device 20;
  • the signal processing device 20 is further configured to mix the to-be-converted signal with the harmonic signal corresponding to the spectral component to obtain a down-converted signal.
  • the signal receiving system in the embodiment of the present invention may further include other devices, and is not related to the present invention, so it is not described in the embodiment of the present invention.

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Abstract

本发明公开了一种信号处理的方法,包括:确定待下变频信号的频谱分量在预划分子带中的位置信息,所述预划分子带的带宽取决于用于混频的本振信号的周期,根据所述频谱分量在所述预划分子带中的位置信息,确定对应所述待下变频信号的所述本振信号的频谱支撑序列,所述本振信号的频谱支撑序列用于指示本振信号产生装置只在所述频谱分量所在的子带中心处产生预置大小的谐波信号,将所述待下变频信号,与对应所述频谱分量的所述谐波信号进行混频,得到下变频信号。本发明实施例提供的信号处理的方法,所述待下变频信号只与其频谱分量所在的子带中心处的谐波信号进行混频,从而提升了混频后混叠信号的信噪比。

Description

一种信号处理的方法、 装置及系统 技术领域
本发明涉及通信技术领域, 具体涉及一种信号处理的方法、 装置及系统。 背景技术
通信系统的接收端在接收到信号后,会将接收到的信号作为输入信号送入 混频器中与载波频率相同的本振信号进行混频,将输入信号下变频为基带信号 后再进行采样处理。 当输入信号是由多个具有不同载波频率的窄带信号构成 时,接收端需要对每个窄带信号分別进行混频采样, 即接收端需要有多个并行 接收通路,每个通路接收一个窄带信号,通路中本振信号的频率与所接收的信 号的载波频率相同,低通滤波器的截止频率和模数转换器的采样频率也都根据 所接收信号的带宽设定。这样接收机射频前端电路复杂度随着信号数目的增加 而增大。
调制宽带转换器(Modulated Wideband Converter , MWC )是一个主要用 于接收多带信号的序列解调接收机。 它采用周期性的随机序列产生混频信号, 这样的随机序列在频域是由许多等间隔的离散谐振频点构成,产生随机序列的 时钟速度决定了谐振频点的最高频率, 也就是 MWC 所能支持的频带宽度。 MWC所能支持的整个射频带宽可以分为 M个子带, 子带的带宽为 , 每个 子带的中心对应随机序列的一个谐振频点。 由于采用了压缩感知技术, 与传统 接收机不同, 它允许各窄带信号在混频后混叠在一起, 然后通过算法把每个信 号的采样点分离出来。
本发明的发明人发现,现有技术中 MWC处理信号过程使用随机序列产生 的本振信号进行混频时,每个子带中的信号都会被搬移到基带混叠起来。 当输 入信号是由分散的窄带信号构成时,存在一些没有任何有用信号的子带。这些 子带里含有的噪声和干扰信号也会在混频过程中被搬移到基带和有用信号混 叠起来, 导致后期恢复的信号信噪比降低。
发明内容
本发明实施例提供一种信号处理的方法,在待下变频信号中有多个不同频 段的信号,且通过一条混频通路混频时, 所述待下变频信号只与其频谱分量所 在的子带中心处的谐波信号进行混频, 可以提升混频后混叠信号的信噪比。 本 发明实施例还提供了相应的装置及系统。
本发明第一方面提供一种信号处理的方法, 包括:
确定待下变频信号的频谱分量在预划分子带中的位置信息,所述预划分子 带的带宽取决于用于混频的本振信号的周期;
根据所述频谱分量在所述预划分子带中的位置信息,确定对应所述待下变 频信号的所述本振信号的频谱支撑序列,所述本振信号的频谱支撑序列用于指 示本振信号产生装置只在所述频谱分量所在的子带中心处产生预置大小的谐 波信号;
将所述待下变频信号, 与对应所述频谱分量的所述谐波信号进行混频,得 到下变频信号。
结合第一方面,在第一种可能的实现方式中, 所述确定待下变频信号的频 谱分量在预划分子带中的位置信息时, 所述方法还包括:
确定混叠模式的种类, 以及每种混叠模式中所包含的混叠信号的个数, 所 述混叠模式用于描述不同频段范围内所包含的混叠信号的情况;
根据所述预划分子带的个数和所述每种混叠模式中所包含的混叠信号的 个数, 确定用于描述混频及模数转换采样过程的测量矩阵。
结合第一方面第一种可能的实现方式, 在第二种可能的实现方式中, 所述 根据所述预划分子带的个数和所述每种混叠模式中所包含的混叠信号的个数, 确定用于描述混频及模数转换采样过程的测量矩阵, 包括:
根据所述预划分子带的个数, 确定所述测量矩阵的列数;
根据包含混叠信号个数最多的混叠模式所包含的混叠信号的个数,确定所 述测量矩阵的行数。
结合第一方面第一种或第二种可能的实现方式,在第三种可能的实现方式 中, 所述方法还包括:
根据所述每种混叠模式中所包含的混叠信号的个数和所述测量矩阵,确定 对应所述每种混叠模式的模式测量矩阵,所述模式测量矩阵为根据模式混叠信 号所对应的频谱分量所在子带的位置信息,对应所述测量矩阵的列所形成的子 矩阵, 所述模式混叠信号为所述每种混叠模式中所包含的混叠信号。
结合第一方面第三种可能的实现方式, 在第四种可能的实现方式中, 所述 确定对应所述每种混叠模式的模式测量矩阵之后, 所述方法还包括:
根据初始子带集合,确定所述模式测量矩阵中的非列满秩矩阵, 所述初始 子带集合为所述频谱分量所在子带的位置信息的集合;
按照预置策略,在所述初始子带集合中加入新的子带位置信息,将所述非 列满秩矩阵调整为列满秩矩阵。
结合第一方面第四种可能的实现方式, 在第五种可能的实现方式中, 所述 按照预置策略,在所述初始子带集合中加入新的子带位置信息,将所述非列满 秩矩阵调整为列满秩矩阵, 包括:
按照预置策略, 确定加入所述初始子带集合的所述新的子带位置信息; 根据所述新的子带位置信息和所述频谱分量所在子带的位置信息,重新确 定所述每种混叠模式的模式测量矩阵, 将所述非列满秩矩阵调整为列满秩矩 阵。
结合第一方面第五种可能的实现方式, 在第六种可能的实现方式中, 所述根据所述频谱分量在所述预划分子带中的位置信息,确定对应所述待 下变频信号的所述本振信号的频谱支撑序列,所述本振信号的频谱支撑序列用 于指示本振信号产生装置只在所述频谱分量所在的子带中心处产生预置大小 的谐波信号, 包括:
根据所述频谱分量在所述预划分子带中的位置信息和所述新的子带位置 信息,确定对应所述待下变频信号的所述本振信号的频谱支撑序列, 所述本振 信号的频谱支撑序列用于指示本振信号产生装置只在所述频谱分量所在的子 带中心处和所述新的子带位置信息指示的子带中心处产生预置大小的谐波信 号;
所述将所述待下变频信号, 与对应所述频谱分量的所述谐波信号进行混 频, 得到下变频信号, 包括:
将所述待下变频信号, 与对应所述频谱分量的所述谐波信号, 以及所述新 的子带位置信息指示的子带处的所述谐波信号进行混频, 得到所述下变频信 号。
本发明第二方面提供一种信号处理的装置, 包括:
第一确定单元,用于确定待下变频信号的频谱分量在预划分子带中的位置 信息, 所述预划分子带的带宽取决于用于混频的本振信号的周期;
第二确定单元,用于根据所述第一确定单元确定的所述频谱分量在所述预 划分子带中的位置信息,确定对应所述待下变频信号的所述本振信号的频谱支 撑序列,所述本振信号的频谱支撑序列用于指示本振信号产生装置只在所述频 谱分量所在的子带中心处产生预置大小的谐波信号;
混频单元, 用于将所述待下变频信号, 与所述第二确定单元确定的所述对 应所述频谱分量的所述谐波信号进行混频, 得到下变频信号。
结合第二方面, 在第一种可能的实现方式中, 所述装置还包括: 第三确定单元,用于在所述第一确定单元确定所述待下变频信号的频谱分 量在预划分子带中的位置信息时,确定混叠模式的种类, 以及每种混叠模式中 所包含的混叠信号的个数,所述混叠模式用于描述不同频段范围内所包含的混 叠信号的情况;
第四确定单元,用于根据所述预划分子带的个数和所述第三确定单元确定 的所述每种混叠模式中所包含的混叠信号的个数,确定用于描述混频及模数转 换采样过程的测量矩阵。
结合第二方面第一种可能的实现方式, 在第二种可能的实现方式中, 所述第四确定单元, 用于根据所述预划分子带的个数,确定所述测量矩阵 的列数,根据包含混叠信号个数最多的混叠模式所包含的混叠信号的个数, 确 定所述测量矩阵的行数。
结合第二方面第一种或第二种可能的实现方式,在第三种可能的实现方式 中, 所述装置还包括:
第五确定单元,用于根据所述第三确定单元确定的所述每种混叠模式中所 包含的混叠信号的个数和所述第四确定单元确定的所述测量矩阵,确定对应所 述每种混叠模式的模式测量矩阵,所述模式测量矩阵为模式混叠信号所对应的 频谱分量所在子带的位置信息,对应所述测量矩阵的列所形成的子矩阵, 所述 模式混叠信号为所述每种混叠模式中所包含的混叠信号。
结合第二方面第三种可能的实现方式, 在第四种可能的实现方式中, 所述 装置还包括:
第六确定单元, 用于根据初始子带集合,确定所述第五确定单元确定的所 述模式测量矩阵中的非列满秩矩阵,所述初始子带集合为所述频谱分量所在子 带的位置信息的集合;
调整单元, 用于按照预置策略,在所述初始子带集合中加入新的子带位置 信息, 将所述第六确定单元确定的所述非列满秩矩阵调整为列满秩矩阵。
结合第二方面第四种可能的实现方式, 在第五种可能的实现方式中, 所述调整单元, 用于按照预置策略,确定加入所述初始子带集合的所述新 的子带位置信息,根据所述新的子带位置信息和所述频谱分量所在子带的位置 信息, 重新确定所述每种混叠模式的模式测量矩阵,将所述非列满秩矩阵调整 为列满秩矩阵。
结合第二方面第五种可能的实现方式, 在第六种可能的实现方式中, 所述第二确定单元,用于根据所述频谱分量在所述预划分子带中的位置信 息和所述新的子带位置信息,确定对应所述待下变频信号的所述本振信号的频 谱支撑序列,所述本振信号的频谱支撑序列用于指示本振信号产生装置只在所 述频谱分量所在的子带中心处和所述新的子带位置信息指示的子带中心处产 生预置大小的谐波信号;
所述混频单元, 用于将所述待下变频信号, 与对应所述频谱分量的所述谐 波信号, 以及所述新的子带位置信息指示的子带处的所述谐波信号进行混频, 得到所述下变频信号。
本发明第三方面提供一种信号接收机, 包括: 输入设备、 输出设备、 存储 器和处理器,
其中, 所述处理器用于执行如下步骤:
确定待下变频信号的频谱分量在预划分子带中的位置信息,所述预划分子 带的带宽取决于用于混频的本振信号的周期; 根据所述频谱分量在所述预划分子带中的位置信息,确定对应所述待下变 频信号的所述本振信号的频谱支撑序列,所述本振信号的频谱支撑序列用于指 示本振信号产生装置只在所述频谱分量所在的子带中心处产生预置大小的谐 波信号;
将所述待下变频信号, 与对应所述频谱分量的所述谐波信号进行混频,得 到下变频信号。
本发明第四方面提供一种信号接收系统, 包括: 天线、 信号处理的装置和 本振信号产生装置;
所述天线, 用于接收所述待下变频信号;
所述信号处理的装置,用于确定待下变频信号的频谱分量在预划分子带中 的位置信息, 所述预划分子带的带宽取决于用于混频的本振信号的周期,根据 所述频谱分量在所述预划分子带中的位置信息,确定对应所述待下变频信号的 所述本振信号的频谱支撑序列,所述本振信号的频谱支撑序列用于指示本振信 号产生装置只在所述频谱分量所在的子带中心处产生预置大小的谐波信号; 所述本振信号产生装置,用于在所述频谱分量所在的子带中心处产生预置 大小的谐波信号, 并发送给所述信号处理装置;
所述信号处理的装置,还用于将所述待下变频信号, 与对应所述频谱分量 的所述谐波信号进行混频, 得到下变频信号。
本发明实施例首先确定待下变频信号的频谱分量在预划分子带中的位置 信息, 所述预划分子带的带宽取决于用于混频的本振信号的周期,根据所述频 谱分量在所述预划分子带中的位置信息,确定对应所述待下变频信号的所述本 振信号的频谱支撑序列,所述本振信号的频谱支撑序列用于指示本振信号产生 装置只在所述频谱分量所在的子带中心处产生预置大小的谐波信号,将所述待 下变频信号,与对应所述频谱分量的所述谐波信号进行混频,得到下变频信号。 与现有技术中多个不同频段的信号通过与在所有子带都有谐波的本振信号混 频时把所有子带噪声全部混叠到基带, 降低了混叠信号的信噪比相比, 本发明 实施例提供的信号处理的方法,所述待下变频信号只与其频谱分量所在的子带 中心处的谐波信号进行混频, 从而提升了混频后混叠信号的信噪比。 附图说明
为了更清楚地说明本发明实施例中的技术方案,下面将对实施例描述中所 需要使用的附图作筒单地介绍,显而易见地, 下面描述中的附图仅仅是本发明 的一些实施例, 对于本领域技术人员来讲, 在不付出创造性劳动的前提下, 还 可以根据这些附图获得其他的附图。
图 1是本发明实施例中信号处理的方法的一实施例示意图;
图 2是本发明实施例中信号处理的方法的另一实施例示意图;
图 3是本发明实施例中信号处理的方法的另一实施例示意图;
图 4是本发明实施例中信号处理的方法的另一实施例示意图;
图 5是本发明实施例中信号处理的方法的另一实施例示意图;
图 6是本发明实施例中信号处理的装置的一实施例示意图;
图 7是本发明实施例中信号处理的装置的另一实施例示意图;
图 8是本发明实施例中信号处理的装置的另一实施例示意图;
图 9是本发明实施例中信号处理的装置的另一实施例示意图;
图 10是本发明实施例中信号接收机的一实施例示意图;
图 11是本发明实施例中信号接收系统的一实施例示意图。
具体实施方式
本发明实施例提供一种信号处理的方法,在待下变频信号中有多个不同频 段的信号,且通过一条混频通路混频时, 所述待下变频信号只与其频谱分量所 在的子带中心处的谐波信号进行混频, 从而提升了混频后混叠信号的信噪比。 本发明实施例还提供了相应的装置及系统。 以下分別进行详细说明。
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清 楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而不是 全部的实施例。基于本发明中的实施例, 本领域技术人员在没有作出创造性劳 动前提下所获得的所有其他实施例, 都属于本发明保护的范围。
参阅图 1 , 本发明实施例提供的信号处理的方法的一实施例包括:
101、 确定待下变频信号的频谱分量在预划分子带中的位置信息, 所述预 划分子带的带宽取决于用于混频的本振信号的周期。 本发明实施例中的待下变频信号可以包含多个频段不同的窄带信号。
子带是按照用于混频的本振信号的周期预先划分的,以 Tp表示序列方波的 周期, 定义一个子带的宽带为 ^ = 1/7;, 整个可接收的射频范围可以分成 L。个 子带。
关于待下变频信号的频谱分量在预划分子带中的位置信息可以参阅图 2和 图 3进行理解, 图 2为本发明实施例中的待下变频信号, 该待下变频信号中包含 4个不同频段的信号, 频段分別为 ^至 , f21至 f22, f31至 f32, ^至 , 通过时 域和频域的变换可以确定这四个频段的信号的频谱分量,假设整个可接收的射 频范围可以分成 15个子带, 最中间的子带可以标识为 0, 左边为负向, 用连续 的负整数表示, 右边为正向, 用连续的正整数表示。 参阅图 3 , 图 3所示为这四 个频段的信号的频谱分量在子带中的位置分布, 从图 3上可以看出, 这四个频 段的信号分布在五个子带, 有频谱分量的子带位置编号分別为 -6、 -3、 -2、 1、 4, 也就是待下变频信号的频谱分量在预划分子带中的位置信息分別为 -6、 -3、 -2、 1、 4。
102、 根据所述频谱分量在所述预划分子带中的位置信息, 确定对应所述 待下变频信号的所述本振信号的频谱支撑序列,所述本振信号的频谱支撑序列 用于指示本振信号产生装置只在所述频谱分量所在的子带中心处产生预置大 小的谐波信号。
参阅图 4,图 4为针对图 3中分布在五个子带的信号产生的谐波信号的位置, 也就是在所述频谱分量所在的子带中心处产生预置大小的谐波信号。
假如本振信号的频谱支撑序列用 0、 1来描述, 那么有谐波信号的用 1来表 示, 没有谐波信号用 0来表示。针对图 4对应的本振信号的频谱支撑序列可以表 示为 (0、 1、 0、 0、 1、 1、 0、 0、 1、 0、 0、 1、 0、 0、 0 ), 则本振信号产生装 置会在序列中标识为 1的位置产生预置大小的谐波信号。
103、 将所述待下变频信号, 与对应所述频谱分量的所述谐波信号进行混 频, 得到下变频信号。
参阅图 5 , 图 5为图 3中的处于五个子带的四个不同频段信号与五个本振信 号混频后的下变频信号示意图。 本发明实施例通过确定待下变频信号的频谱分量在预划分子带中的位置 信息, 所述预划分子带的带宽取决于用于混频的本振信号的周期,根据所述频 谱分量在所述预划分子带中的位置信息,确定对应所述待下变频信号的所述本 振信号的频谱支撑序列,所述本振信号的频谱支撑序列用于指示本振信号产生 装置只在所述频谱分量所在的子带中心处产生预置大小的谐波信号,将所述待 下变频信号,与对应所述频谱分量的所述谐波信号进行混频,得到下变频信号。 与现有技术中多个不同频段的信号通过与在所有子带都有谐波的本振信号混 频时把所有子带噪声全部混叠到基带, 降低了混叠信号的信噪比相比, 本发明 实施例提供的信号处理的方法,所述待下变频信号只与其频谱分量所在的子带 中心处的谐波信号进行混频, 从而提升了混频后混叠信号的信噪比。
可选地,在上述实施例的基石出上, 本发明实施例提供的信号处理的方法的 另一实施例中,所述确定待下变频信号的频谱分量在预划分子带中的位置信息 时, 所述方法还可以包括:
确定混叠模式的种类, 以及每种混叠模式中包含混叠信号的个数, 所述混 叠模式用于描述不同频段范围内所包含的混叠信号的情况;
根据所述预划分子带的个数和所述每种混叠模式中所包含的混叠信号的 个数, 确定用于描述混频及模数转换采样过程的测量矩阵。
其中,根据所述预划分子带的个数和所述每种混叠模式中所包含的混叠信 号的个数, 确定所述测量矩阵, 可以包括:
根据所述预划分子带的个数, 确定所述测量矩阵的列数;
根据包含混叠信号个数最多的混叠模式所包含的混叠信号的个数,确定所 述测量矩阵的行数。
本发明实施例中,混叠模式用于描述不同频段范围内所包含的混叠信号的 情况,在通过谐波信号下变频的过程中,在保证有信号的子带都有对应的谐波 信号后, 谐波信号数量只会影响噪声, 不会影响混叠信号的分布, 因此在混频 前就可以确定混叠模式的种类, 以及每种混叠模式中包含混叠信号的个数。
如图 5所示, 图 5中示出了五个子带的信号在混叠后的信号分布,每个子带 信号用一种标识表示, 如图 5中用无色圓圏、 黑色圓圏、 无色方块、 黑色方块 和黑色三角五种标识分別标识了五个子带的信号。这四个频段的输入信号在混 叠后会有 9种混叠模式, 图 5中每种混叠模式由虚线间隔开, 从左向右, 第一种 混叠模式包含无色圓圏所标识的一个信号,第二种混叠模式包含无色圓圏和无 色方块所标识的两个信号, 第三种混叠模式包含无色圓圏、无色方块和黑色圓 圏所标识的三个信号,第四种混叠模式包含无色方块和黑色圓圏所标识的两个 信号, 第五种混叠模式包含黑色圓圏所标识的一个信号, 第六种混叠模式包含 黑色圓圏和黑色三角所标识的两个信号,第七种混叠模式包含黑色三角所标识 的一个信号, 第八种混叠模式包含黑色三角和黑色方块所标识的两个信号, 第 九种混叠模式包含黑色方块所标识的一个信号。
混频过程中有用信号在基带混叠起来。把混叠的信号进行分离的过程实际 上是一个通过逆矩阵求解原信号的过程,为了使混叠后的信号能正确的进行分 离, 描述混频采样得到基带采样信号过程的所述测量矩阵一定要满足列满秩。
信号混频采样过程在频域可以表达为: ; = AZ(f)
其中, ιχο是采样点的离散傅里叶变换, Ζ(/)为下变频信号的频谱 按 子带分割的矢量表示, Α为所述测量矩阵。
假设可接收频段范围被划分为 L。个子带, 带宽为 那么待下变频信号的 频谱 按子带分割可以用矢量表示成:
Figure imgf000012_0001
f f
其中, (/) X (f - ifP ) - L0 , · · · , L0
0, otherwise 延续图 2-图 5的场景, 该场景中有 15个子带, 所以通用测量矩阵 A有 15列, 编号为从 -7到 +7的 15个整数, 上述 9个混叠模式中, 混叠信号最多的第三个混 叠模式中有三个信号, 所以该通用测量矩阵 A有 3行, 中间行的标识从 -7到 +7, 上边一行向右移动一列, 下边一行向左移动一列, 如果测量矩阵应该由 5行或 其他行数, 也按这种移动方式移动。
由此得到的通用测量矩阵 A如下: 0
A αΊ
Figure imgf000013_0001
可选地,在上述实施例的基石出上, 本发明实施例提供的信号处理的方法的 另一实施例中, 所述方法还可以包括:
根据所述每种混叠模式中所包含的混叠信号的个数和所述测量矩阵,确定 对应所述每种混叠模式的模式测量矩阵,所述模式测量矩阵为根据模式混叠信 号所对应的频谱分量所在子带的位置信息,对应所述测量矩阵的列所形成的子 矩阵, 所述模式混叠信号为所述每种混叠模式中所包含的混叠信号。
其中, 所述确定对应所述每种混叠模式的模式测量矩阵之后, 所述方法还 可以包括:
根据初始子带集合,确定所述模式测量矩阵中的非列满秩矩阵, 所述初始 子带集合为所述频谱分量所在子带的位置信息的集合;
按照预置策略,在所述初始子带集合中加入新的子带位置信息,将所述非 列满秩矩阵调整为列满秩矩阵。
其中,所述按照预置策略,在所述初始子带集合中加入新的子带位置信息, 将所述非列满秩矩阵调整为列满秩矩阵, 包括:
按照预置策略, 确定加入所述初始子带集合的所述新的子带位置信息; 根据所述新的子带位置信息和所述频谱分量所在子带的位置信息,重新确 定所述每种混叠模式的模式测量矩阵, 将所述非列满秩矩阵调整为列满秩矩 阵。
在图 2-图 5对应的场景中, 如图 5所示, 共有 9种混叠模式, 第一种混叠模 式中, 只有子带标识为 -6中的信号, 结合通用测量矩阵 可以得到第一种混 叠模式测量矩阵为:
0
Λ α
0 以此类推, 本处不——列出 9中混叠模式的模式测量矩阵, 可以分別得到 9 种混叠模式的模式测量矩阵, 至^9 , 列满秩是现有技术, 指的是列秩等于列 数, 就是初等变换以后没有一列全为 0, 因此, 可以根据得到的 A至 , 判断 出 A3、 A4 , A6为非列满秩矩阵。 Α3、 、 Α6的矩阵表示如下:
Figure imgf000014_0001
实际上, 从图 3中就可以确定出只在五个子带 -6、 -3、 -2、 1、 4处有信号, 所以可以直接使用下变频信号的频谱分量所在子带的位置信息来确定非列满 秩矩阵。 也可以将 -6、 -3、 -2、 1、 4定义为一个初始子带集合 Γ = {- 6,-3,-2,1,4}。 然后, 直接使用初始子带集合中的信息确定出 A3、 A4 , A6为非列满秩矩阵。
要使混叠的信号能正确的分离出来, 每个模式下的矩阵必须是列满秩矩 阵, 因此, 需要将 Α3、 Α4 , 调整成列满秩矩阵, 如何进行调整, 本发明实 施例提供的方案是在初始子带集合中引入新的子带位置信息,然后使用增加新 的子带位置信息后的子带集合来调整非列满秩矩阵, 使其成为列满秩矩阵。
选择新的子带位置信息的条件是: 所选子带应使得最多的矩阵列秩增加, 同时应尽可能少地影响它不能增加列秩的矩阵, 以免增加那些矩阵的条件数。 当某子带增加部分矩阵列秩的同时会造成其他矩阵条件数升高时,可以以每个 矩阵所覆盖的频段宽度等参数作为权重进行选择。 重复这个过程, 直到所有的 矩阵达到列满秩。 在我们这个例子中, 4艮明显, 如果在 Γ中加入 -5 , 那么所有 矩阵就可以达到列满秩。这样, 就可以确定能使每个模式测量矩阵都达到列满 秩的最小子带集合为 Τ = {- 6,-5,-3,-2,1,4} 而如果加入其它子带, 那么就仍然有 部分矩阵不能达到列满秩, 需要在选择新的子带加入。 这样, 不仅 Γ不能达到 最小集合, 而且某些矩阵的条件数会增大。
可选地,在上述实施例的基石出上, 本发明实施例提供的信号处理的方法的 另一实施例中, 所述根据所述频谱分量在所述预划分子带中的位置信息,确定 对应所述待下变频信号的所述本振信号的频谱支撑序列,所述本振信号的频谱 支撑序列用于指示本振信号产生装置只在所述频谱分量所在的子带中心处产 生预置大小的谐波信号, 可以包括:
根据所述频谱分量在所述预划分子带中的位置信息和所述新的子带位置 信息,确定对应所述待下变频信号的所述本振信号的频谱支撑序列, 所述本振 信号的频谱支撑序列用于指示本振信号产生装置只在所述频谱分量所在的子 带中心处和所述新的子带位置信息指示的子带中心处产生预置大小的谐波信 号;
所述将所述待下变频信号, 与对应所述频谱分量的所述谐波信号进行混 频, 得到下变频信号, 可以包括:
将所述待下变频信号, 与对应所述频谱分量的所述谐波信号, 以及所述新 的子带位置信息指示的子带处的所述谐波信号进行混频, 得到所述下变频信 号。
本发明实施例中, 当上述确定出最小子带集合后, 例如, 上述确定的最小 子带集合在初始子带集合的基 上, 增加了新的子带的位置信息 -5 , 这样, 在 进行信号混频时, 需要调整本振信号的频谱支撑序列,将原来的本振信号的频 谱支撑序列可以表示为 (0、 1、 0、 0、 1、 1、 0、 0、 1、 0、 0、 1、 0、 0、 0 ), 调整为 (0、 1、 1、 0、 1、 1、 0、 0、 1、 0、 0、 1、 0、 0、 0 ), 这样, 本振信号 产生装置就会在 -5的子带中心处也产生一个预置大小的谐波信号。
参阅图 6, 本发明实施例提供的信号处理的装置 20的一实施例包括: 第一确定单元 201 , 用于确定待下变频信号的频谱分量在预划分子带中的 位置信息, 所述预划分子带的带宽取决于用于混频的本振信号的周期;
第二确定单元 202,用于根据所述第一确定单元 201确定的所述频谱分量在 所述预划分子带中的位置信息,确定对应所述待下变频信号的所述本振信号的 频谱支撑序列,所述本振信号的频谱支撑序列用于指示本振信号产生装置只在 所述频谱分量所在的子带中心处产生预置大小的谐波信号;
混频单元 203 , 用于将所述待下变频信号, 与所述第二确定单元 202确定的 所述对应所述频谱分量的所述谐波信号进行混频, 得到下变频信号。
本发明实施例中, 第一确定单元 201确定待下变频信号的频谱分量在预划 分子带中的位置信息,所述预划分子带的带宽取决于用于混频的本振信号的周 期,第二确定单元 202根据所述第一确定单元 201确定的所述频谱分量在所述预 划分子带中的位置信息,确定对应所述待下变频信号的所述本振信号的频谱支 撑序列,所述本振信号的频谱支撑序列用于指示本振信号产生装置只在所述频 谱分量所在的子带中心处产生预置大小的谐波信号, 混频单元 203将所述待下 变频信号, 与所述第二确定单元 202确定的所述对应所述频谱分量的所述谐波 信号进行混频,得到下变频信号。 与现有技术中多个不同频段的信号通过与在 所有子带都有谐波的本振信号混频时把所有子带噪声全部混叠到基带,降低了 混叠信号的信噪比相比, 本发明实施例提供的信号处理的装置, 所述待下变频 信号只与其频谱分量所在的子带中心处的谐波信号进行混频,从而提升了混频 后混叠信号的信噪比。
可选地, 在上述图 6对应的实施例的基石出上, 参阅图 7, 本发明实施例提供 的信号处理的装置的另一实施例中, 所述装置 20还包括:
第三确定单元 204,用于在所述第一确定单元 201确定所述待下变频信号的 频谱分量在预划分子带中的位置信息时,确定混叠模式的种类, 以及每种混叠 模式中所包含的混叠信号的个数,所述混叠模式用于描述不同频段范围内所包 含的混叠信号的情况;
第四确定单元 205 , 用于根据所述预划分子带的个数和所述第三确定单元
204确定的所述每种混叠模式中所包含的混叠信号的个数, 确定用于描述混频 及模数转换采样过程的测量矩阵。
在上述图 7对应的实施例的基础上, 本发明实施例提供的信号处理的装置 的另一实施例中,
所述第四确定单元 205 , 用于根据所述预划分子带的个数, 确定所述测量 矩阵的列数, 根据包含混叠信号个数最多的混叠模式所包含的混叠信号的个 数, 确定所述测量矩阵的行数。
在上述图 7对应的实施例的基础上, 参阅图 8, 本发明实施例提供的信号处 理的装置的另一实施例中, 所述装置 20还包括:
第五确定单元 206,用于根据所述第三确定单元 204确定的所述每种混叠模 式中所包含的混叠信号的个数和所述第四确定单元 205确定的所述测量矩阵, 确定对应所述每种混叠模式的模式测量矩阵,所述模式测量矩阵为模式混叠信 号所对应的频谱分量所在子带的位置信息,对应所述测量矩阵的列所形成的子 矩阵, 所述模式混叠信号为所述每种混叠模式中所包含的混叠信号。 在上述图 8对应的实施例的基础上, 参阅图 9, 本发明实施例提供的信号处 理的装置的另一实施例中, 所述装置 20还包括:
第六确定单元 207 , 用于根据初始子带集合, 确定所述第五确定单元 206 确定的所述模式测量矩阵中的非列满秩矩阵,所述初始子带集合为所述频谱分 量所在子带的位置信息的集合;
调整单元 208, 用于按照预置策略, 在所述初始子带集合中加入新的子带 位置信息, 将所述第六确定单元 207确定的所述非列满秩矩阵调整为列满秩矩 阵。
在上述图 9对应的实施例的基础上, 本发明实施例提供的信号处理的装置 的另一实施例中,
所述调整单元 208 , 用于按照预置策略, 确定加入所述初始子带集合的所 述新的子带位置信息,根据所述新的子带位置信息和所述频谱分量所在子带的 位置信息, 重新确定所述每种混叠模式的模式测量矩阵,将所述非列满秩矩阵 调整为列满秩矩阵。
在上述图 9对应的实施例的基础上, 本发明实施例提供的信号处理的装置 的另一实施例中,
所述第二确定单元 202, 用于根据所述频谱分量在所述预划分子带中的位 置信息和所述新的子带位置信息,确定对应所述待下变频信号的所述本振信号 的频谱支撑序列,所述本振信号的频谱支撑序列用于指示本振信号产生装置只 在所述频谱分量所在的子带中心处和所述新的子带位置信息指示的子带中心 处产生预置大小的谐波信号;
所述混频单元 203 , 用于将所述待下变频信号, 与对应所述频谱分量的所 述谐波信号,以及所述新的子带位置信息指示的子带处的所述谐波信号进行混 频, 得到所述下变频信号。 图 10是本发明实施例信号接收机 200的结构示意图。信号接收机 200可包括 输入设备 210、 输出设备 220、 处理器 230和存储器 240。 存储器 240可以包括只读存储器和随机存取存储器,并向处理器 230提供指 令和数据。 存储器 240的一部分还可以包括非易失性随机存取存储器 ( NVRAM )。
存储器 240存储了如下的元素, 可执行模块或者数据结构, 或者它们的子 集, 或者它们的扩展集:
操作指令: 包括各种操作指令, 用于实现各种操作。
操作系统: 包括各种系统程序, 用于实现各种基础业务以及处理基于硬件 的任务。
在本发明实施例中, 处理器 230通过调用存储器 240存储的操作指令(该操 作指令可存储在操作系统中), 执行如下操作:
确定待下变频信号的频谱分量在预划分子带中的位置信息,所述预划分子 带的带宽取决于用于混频的本振信号的周期;
根据所述频谱分量在所述预划分子带中的位置信息,确定对应所述待下变 频信号的所述本振信号的频谱支撑序列,所述本振信号的频谱支撑序列用于指 示本振信号产生装置只在所述频谱分量所在的子带中心处产生预置大小的谐 波信号;
将所述待下变频信号, 与对应所述频谱分量的所述谐波信号进行混频,得 到下变频信号。
本发明实施例中, 信号接收机 200在待下变频信号中有多个不同频段的信 号, 且通过一条混频通路混频时, 可以提升混频后混叠信号的信噪比。
处理器 230控制信号接收机 200的操作,处理器 230还可以称为 CPU( Central Processing Unit, 中央处理单元)。 存储器 240可以包括只读存储器和随机存取 存储器, 并向处理器 230提供指令和数据。存储器 240的一部分还可以包括非易 失性随机存取存储器(NVRAM )。 具体的应用中, 信号接收机 200的各个组件 通过总线系统 250耦合在一起, 其中总线系统 250除包括数据总线之外,还可以 包括电源总线、控制总线和状态信号总线等。 但是为了清楚说明起见, 在图中 将各种总线都标为总线系统 250。
上述本发明实施例揭示的方法可以应用于处理器 230中,或者由处理器 230 实现。 处理器 230可能是一种集成电路芯片, 具有信号的处理能力。 在实现过 件形式的指令完成。 上述的处理器 230可以是通用处理器、 数字信号处理器 ( DSP )、 专用集成电路(ASIC )、 现成可编程门阵列 (FPGA )或者其他可编 程逻辑器件、 分立门或者晶体管逻辑器件、 分立硬件组件。 可以实现或者执行 本发明实施例中的公开的各方法、 步骤及逻辑框图。通用处理器可以是微处理 器或者该处理器也可以是任何常规的处理器等。结合本发明实施例所公开的方 法的步骤可以直接体现为硬件译码处理器执行完成,或者用译码处理器中的硬 件及软件模块组合执行完成。 软件模块可以位于随机存储器, 闪存、 只读存储 器, 可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存 储介质中。 该存储介质位于存储器 240, 处理器 230读取存储器 240中的信息, 结合其硬件完成上述方法的步骤。
可选地, 处理器 230具体可确定混叠模式的种类, 以及每种混叠模式中所 包含的混叠信号的个数,所述混叠模式用于描述不同频段范围内所包含的混叠 信号的情况,根据所述预划分子带的个数和所述每种混叠模式中包含混叠信号 的个数, 确定用于描述混频及模数转换采样过程的测量矩阵。
可选地, 处理器 230具体可根据所述预划分子带的个数, 确定所述测量矩 阵的列数, 根据包含混叠信号个数最多的混叠模式所包含的混叠信号的个数, 确定所述测量矩阵的行数。
可选地, 处理器 230具体可根据所述每种混叠模式中所包含的混叠信号的 个数和所述测量矩阵,确定对应所述每种混叠模式的模式测量矩阵, 所述模式 测量矩阵为根据模式混叠信号所对应的频谱分量所在子带的位置信息,对应所 述测量矩阵的列所形成的子矩阵,所述模式混叠信号为所述每种混叠模式中所 包含的混叠信号。
可选地, 处理器 230具体可根据初始子带集合, 确定所述模式测量矩阵中 的非列满秩矩阵,所述初始子带集合为所述频谱分量所在子带的位置信息的集 合, 按照预置策略, 在所述初始子带集合中加入新的子带位置信息, 将所述非 列满秩矩阵调整为列满秩矩阵。 可选地, 处理器 230具体可按照预置策略, 确定加入所述初始子带集合的 所述新的子带位置信息,根据所述新的子带位置信息和所述频谱分量所在子带 的位置信息, 重新确定所述每种混叠模式的模式测量矩阵,将所述非列满秩矩 阵调整为列满秩矩阵。
可选地, 处理器 230具体可根据所述频谱分量在所述预划分子带中的位置 信息和所述新的子带位置信息,确定对应所述待下变频信号的所述本振信号的 频谱支撑序列,所述本振信号的频谱支撑序列用于指示本振信号产生装置只在 所述频谱分量所在的子带中心处和所述新的子带位置信息指示的子带中心处 产生预置大小的谐波信号,将所述待下变频信号, 与对应所述频谱分量的所述 谐波信号, 以及所述新的子带位置信息指示的子带处的所述谐波信号进行混 频, 得到所述下变频信号。
参阅图 11 , 本发明实施例提供的信号接收系统的一实施例包括天线 10、信 号处理的装置 20和本振信号产生装置 30;
所述天线 10, 用于接收所述待下变频信号;
所述信号处理的装置 20,用于确定待下变频信号的频谱分量在预划分子带 中的位置信息, 所述预划分子带的带宽取决于用于混频的本振信号的周期,根 据所述频谱分量在所述预划分子带中的位置信息,确定对应所述待下变频信号 的所述本振信号的频谱支撑序列,所述本振信号的频谱支撑序列用于指示本振 信号产生装置只在所述频谱分量所在的子带中心处产生预置大小的谐波信号; 所述本振信号产生装置 30,用于在所述频谱分量所在的子带中心处产生预 置大小的谐波信号, 并发送给所述信号处理装置 20;
所述信号处理的装置 20,还用于将所述待下变频信号, 与对应所述频谱分 量的所述谐波信号进行混频, 得到下变频信号。
当然, 本发明实施例中的信号接收系统还可以包括其他器件, 因与本发明 关联不大, 所以本发明实施例中不做——介绍。
本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分步 骤是可以通过程序来指令相关的硬件来完成,该程序可以存储于一计算机可读 存储介质中, 存储介质可以包括: ROM、 RAM, 磁盘或光盘等。 以上对本发明实施例所提供的信号处理的方法、装置以及系统进行了详细 施例的说明只是用于帮助理解本发明的方法及其核心思想; 同时,对于本领域 的一般技术人员,依据本发明的思想, 在具体实施方式及应用范围上均会有改 变之处, 综上所述, 本说明书内容不应理解为对本发明的限制。

Claims

权 利 要 求
1、 一种信号处理的方法, 其特征在于, 包括:
确定待下变频信号的频谱分量在预划分子带中的位置信息,所述预划分子 带的带宽取决于用于混频的本振信号的周期;
根据所述频谱分量在所述预划分子带中的位置信息,确定对应所述待下变 频信号的所述本振信号的频谱支撑序列,所述本振信号的频谱支撑序列用于指 示本振信号产生装置只在所述频谱分量所在的子带中心处产生预置大小的谐 波信号;
将所述待下变频信号, 与对应所述频谱分量的所述谐波信号进行混频,得 到下变频信号。
2、根据权利要求 1所述的方法, 其特征在于, 所述确定待下变频信号的频 谱分量在预划分子带中的位置信息时, 所述方法还包括:
确定混叠模式的种类, 以及每种混叠模式中所包含的混叠信号的个数, 所 述混叠模式用于描述不同频段范围内所包含的混叠信号的情况;
根据所述预划分子带的个数和所述每种混叠模式中所包含的混叠信号的 个数, 确定用于描述混频及模数转换采样过程的测量矩阵。
3、根据权利要求 2所述的方法, 其特征在于, 所述根据所述预划分子带的 个数和所述每种混叠模式中所包含的混叠信号的个数,确定用于描述混频及模 数转换采样过程的测量矩阵, 包括:
根据所述预划分子带的个数, 确定所述测量矩阵的列数;
根据包含混叠信号个数最多的混叠模式所包含的混叠信号的个数,确定所 述测量矩阵的行数。
4、 根据权利要求 2或 3所述的方法, 其特征在于, 所述方法还包括: 根据所述每种混叠模式中所包含的混叠信号的个数和所述测量矩阵,确定 对应所述每种混叠模式的模式测量矩阵,所述模式测量矩阵为根据模式混叠信 号所对应的频谱分量所在子带的位置信息,对应所述测量矩阵的列所形成的子 矩阵, 所述模式混叠信号为所述每种混叠模式中所包含的混叠信号。
5、根据权利要求 4所述的方法, 其特征在于, 所述确定对应所述每种混叠 模式的模式测量矩阵之后, 所述方法还包括:
根据初始子带集合,确定所述模式测量矩阵中的非列满秩矩阵, 所述初始 子带集合为所述频谱分量所在子带的位置信息的集合;
按照预置策略,在所述初始子带集合中加入新的子带位置信息,将所述非 列满秩矩阵调整为列满秩矩阵。
6、 根据权利要求 5所述的方法, 其特征在于, 所述按照预置策略, 在所述 初始子带集合中加入新的子带位置信息,将所述非列满秩矩阵调整为列满秩矩 阵, 包括:
按照预置策略, 确定加入所述初始子带集合的所述新的子带位置信息; 根据所述新的子带位置信息和所述频谱分量所在子带的位置信息,重新确 定所述每种混叠模式的模式测量矩阵, 将所述非列满秩矩阵调整为列满秩矩 阵。
7、 根据权利要求 6所述的方法, 其特征在于,
所述根据所述频谱分量在所述预划分子带中的位置信息,确定对应所述待 下变频信号的所述本振信号的频谱支撑序列,所述本振信号的频谱支撑序列用 于指示本振信号产生装置只在所述频谱分量所在的子带中心处产生预置大小 的谐波信号, 包括:
根据所述频谱分量在所述预划分子带中的位置信息和所述新的子带位置 信息,确定对应所述待下变频信号的所述本振信号的频谱支撑序列, 所述本振 信号的频谱支撑序列用于指示本振信号产生装置只在所述频谱分量所在的子 带中心处和所述新的子带位置信息指示的子带中心处产生预置大小的谐波信 号;
所述将所述待下变频信号, 与对应所述频谱分量的所述谐波信号进行混 频, 得到下变频信号, 包括:
将所述待下变频信号, 与对应所述频谱分量的所述谐波信号, 以及所述新 的子带位置信息指示的子带处的所述谐波信号进行混频, 得到所述下变频信 号。
8、 一种信号处理的装置, 其特征在于, 包括: 第一确定单元,用于确定待下变频信号的频谱分量在预划分子带中的位置 信息, 所述预划分子带的带宽取决于用于混频的本振信号的周期;
第二确定单元,用于根据所述第一确定单元确定的所述频谱分量在所述预 划分子带中的位置信息,确定对应所述待下变频信号的所述本振信号的频谱支 撑序列,所述本振信号的频谱支撑序列用于指示本振信号产生装置只在所述频 谱分量所在的子带中心处产生预置大小的谐波信号;
混频单元, 用于将所述待下变频信号, 与所述第二确定单元确定的所述对 应所述频谱分量的所述谐波信号进行混频, 得到下变频信号。
9、 根据权利要求 8所述的装置, 其特征在于, 所述装置还包括: 第三确定单元,用于在所述第一确定单元确定所述待下变频信号的频谱分 量在预划分子带中的位置信息时,确定混叠模式的种类, 以及每种混叠模式中 所包含的混叠信号的个数,所述混叠模式用于描述不同频段范围内所包含的混 叠信号的情况;
第四确定单元,用于根据所述预划分子带的个数和所述第三确定单元确定 的所述每种混叠模式中所包含的混叠信号的个数,确定用于描述混频及模数转 换采样过程的测量矩阵。
10、 根据权利要求 9所述的装置, 其特征在于,
所述第四确定单元, 用于根据所述预划分子带的个数,确定所述测量矩阵 的列数,根据包含混叠信号个数最多的混叠模式所包含的混叠信号的个数, 确 定所述测量矩阵的行数。
11、 根据权利要求 9或 10所述的装置, 其特征在于, 所述装置还包括: 第五确定单元,用于根据所述第三确定单元确定的所述每种混叠模式中所 包含的混叠信号的个数和所述第四确定单元确定的所述测量矩阵,确定对应所 述每种混叠模式的模式测量矩阵,所述模式测量矩阵为模式混叠信号所对应的 频谱分量所在子带的位置信息,对应所述测量矩阵的列所形成的子矩阵, 所述 模式混叠信号为所述每种混叠模式中所包含的混叠信号。
12、 根据权利要求 11所述的装置, 其特征在于, 所述装置还包括: 第六确定单元, 用于根据初始子带集合,确定所述第五确定单元确定的所 述模式测量矩阵中的非列满秩矩阵,所述初始子带集合为所述频谱分量所在子 带的位置信息的集合;
调整单元, 用于按照预置策略,在所述初始子带集合中加入新的子带位置 信息, 将所述第六确定单元确定的所述非列满秩矩阵调整为列满秩矩阵。
13、 根据权利要求 12所述的装置, 其特征在于,
所述调整单元, 用于按照预置策略,确定加入所述初始子带集合的所述新 的子带位置信息,根据所述新的子带位置信息和所述频谱分量所在子带的位置 信息, 重新确定所述每种混叠模式的模式测量矩阵,将所述非列满秩矩阵调整 为列满秩矩阵。
14、 根据权利要求 13所述的装置, 其特征在于,
所述第二确定单元,用于根据所述频谱分量在所述预划分子带中的位置信 息和所述新的子带位置信息,确定对应所述待下变频信号的所述本振信号的频 谱支撑序列,所述本振信号的频谱支撑序列用于指示本振信号产生装置只在所 述频谱分量所在的子带中心处和所述新的子带位置信息指示的子带中心处产 生预置大小的谐波信号;
所述混频单元, 用于将所述待下变频信号, 与对应所述频谱分量的所述谐 波信号, 以及所述新的子带位置信息指示的子带处的所述谐波信号进行混频, 得到所述下变频信号。
15、 一种信号接收机, 其特征在于, 包括: 输入设备、 输出设备、 存储器 和处理器,
其中, 所述处理器用于执行如下步骤:
确定待下变频信号的频谱分量在预划分子带中的位置信息,所述预划分子 带的带宽取决于用于混频的本振信号的周期;
根据所述频谱分量在所述预划分子带中的位置信息,确定对应所述待下变 频信号的所述本振信号的频谱支撑序列,所述本振信号的频谱支撑序列用于指 示本振信号产生装置只在所述频谱分量所在的子带中心处产生预置大小的谐 波信号;
将所述待下变频信号, 与对应所述频谱分量的所述谐波信号进行混频,得 到下变频信号。
16、 一种信号接收系统, 其特征在于, 包括: 天线、 信号处理的装置和本 振信号产生装置;
所述天线, 用于接收所述待下变频信号;
所述信号处理的装置,用于确定待下变频信号的频谱分量在预划分子带中 的位置信息, 所述预划分子带的带宽取决于用于混频的本振信号的周期,根据 所述频谱分量在所述预划分子带中的位置信息,确定对应所述待下变频信号的 所述本振信号的频谱支撑序列,所述本振信号的频谱支撑序列用于指示本振信 号产生装置只在所述频谱分量所在的子带中心处产生预置大小的谐波信号; 所述本振信号产生装置,用于在所述频谱分量所在的子带中心处产生预置 大小的谐波信号, 并发送给所述信号处理装置;
所述信号处理的装置,还用于将所述待下变频信号, 与对应所述频谱分量 的所述谐波信号进行混频, 得到下变频信号。
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