WO2007007761A1 - Appareil de réception et procédé de réception - Google Patents

Appareil de réception et procédé de réception Download PDF

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Publication number
WO2007007761A1
WO2007007761A1 PCT/JP2006/313784 JP2006313784W WO2007007761A1 WO 2007007761 A1 WO2007007761 A1 WO 2007007761A1 JP 2006313784 W JP2006313784 W JP 2006313784W WO 2007007761 A1 WO2007007761 A1 WO 2007007761A1
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WIPO (PCT)
Prior art keywords
frequency
signal
filter
band
decoding
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PCT/JP2006/313784
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English (en)
Japanese (ja)
Inventor
Kazuhiko Takeyama
Takashi Enoki
Original Assignee
Matsushita Electric Industrial Co., Ltd.
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Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Publication of WO2007007761A1 publication Critical patent/WO2007007761A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details 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
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
    • H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters

Definitions

  • the present invention relates to a receiving device and a receiving method, and more particularly to a receiving device and a receiving method in a system to which multicarrier communication is applied.
  • An OFDM (Orthogonal Frequency Division Multiplex) system is known as a transmission system using a wide bandwidth of a radio bandwidth of 100 MHz (see Non-Patent Document 1 and Non-Patent Document 2).
  • the OFDM signal is a frequency division multiplexing digital modulation method that transmits digital information using multiple orthogonal subcarriers. It is multipath-resistant, is not susceptible to interference in other transmission systems, is not susceptible to interference, and is used in frequency. It has characteristics such as relatively high efficiency.
  • FIG. 1 is a configuration diagram showing an example of a wideband signal receiving apparatus using an OFDM decoding algorithm (see Patent Document 1).
  • a receiving apparatus 10 shown in FIG. 1 includes an antenna 11, a front end unit 12, a band limiting unit 13, an A / D (Analog to Digital) conversion unit 14, and an OFDM signal processing unit 15.
  • the front end unit 12 amplifies the received signal with low noise and converts it to an IF (Intermediate Frequency) frequency.
  • the band limiting unit 13 includes a wide band filter 16 and a band suppression filter (notch filter) 17 that gives sharp attenuation to a specific frequency.
  • the wideband filter 16 extracts the band of the OFDM signal converted into the IF frequency band.
  • a frequency selective filter is used as a band limiting filter.
  • An excellent filter for example, a SAW (Surface Acoustic Wave) filter using a surface vibration wave of a piezoelectric element is often used.
  • band limiting is performed using a low-pass filter in the baseband frequency band! Yes.
  • the band suppression filter 17 removes adjacent interference components that cannot be removed by the wideband filter 16 alone. Normally, the band suppression filter 17 affects the phase in the OFDM band. However, in the case of OFDM, the phase change is compensated by equalization and demodulation processing of delay detection, so the phase effect is virtually eliminated. It has a special feature.
  • the AZD conversion unit 14 performs A / D conversion on the signal band-limited by the band limiting unit 13 and outputs the AZD-converted signal to the OFDM signal processing unit 15.
  • the OFDM signal processing unit 15 has functions of orthogonal demodulation processing, FFT (Fast Fourier Transform) processing, and channel estimation processing, and performs OF DM decoding processing on the AZD converted signal. .
  • the oversampling number is as large as possible.
  • Non-patent document 1 ITU—RS contribution (TGI 1Z3)
  • Non-Patent Document 2 Television Society Research Report Vol.17, No.54, p7-12, BCS 93-33 (Sep.l99 3)
  • Patent Document 1 Japanese Patent Laid-Open No. 2000-13357
  • An object of the present invention is to provide a receiving apparatus and a receiving apparatus that can suppress undesired signals even when a band-limiting filter having a non-steep suppression characteristic and a variation in frequency characteristics is used in multicarrier communication. Is to provide a method.
  • a receiving apparatus includes a receiving unit that receives a signal including frequency components corresponding to a plurality of carriers to which information data is assigned, and all of the signals included in the received signal.
  • Frequency conversion means for shifting the frequency component frequency, a filter for suppressing the frequency-shifted frequency of some of the frequency components included in the received signal, and the plurality of frequency components among the frequency components remaining without being suppressed.
  • Decoding means for decoding a frequency component corresponding to a carrier, wherein the frequency conversion means matches the frequency of an undesired frequency component whose reception quality does not satisfy a predetermined standard with a frequency suppressed by the filter.
  • undesired signals can be suppressed even in the case of using a band limiting filter having a variation in frequency characteristics that is not sharp in suppression characteristics in multicarrier communication.
  • FIG. 1 is a block diagram showing a configuration of a conventional receiving apparatus
  • FIG. 2 is a block diagram showing a configuration of a receiving apparatus according to Embodiment 1 of the present invention.
  • FIG. 5 is a diagram showing frequency characteristics of a received signal in the IF frequency band of the receiving apparatus according to Embodiment 1.
  • FIG. 6 is a diagram showing frequency characteristics of a received signal in the IF frequency band of the receiving apparatus according to Embodiment 1.
  • FIG. 7 shows the frequency characteristics of the received signal in the IF frequency band of the receiving apparatus according to Embodiment 1.
  • FIG. 8 A diagram showing the frequency characteristics of the received signal in the IF frequency band of the receiving apparatus according to Embodiment 1.
  • FIG. 9 is a diagram showing the frequency characteristics of the received signal in the IF frequency band of the receiving apparatus according to Embodiment 1.
  • FIG. 10 is a block diagram showing a configuration of a receiving apparatus according to Embodiment 2 of the present invention.
  • FIG. 11 is a diagram showing frequency characteristics of frequency domain signals after fast Fourier transform of the receiving apparatus according to Embodiment 2;
  • FIG. 12 is a block diagram showing a configuration of a receiving apparatus according to Embodiment 3 of the present invention.
  • FIG. 13 shows frequency characteristics of frequency domain signals after fast Fourier transform of the receiving apparatus according to Embodiment 3.
  • FIG. 14 is a block diagram showing a configuration of a receiving apparatus according to Embodiment 4 of the present invention.
  • FIG. 16 is a diagram showing frequency characteristics of a received signal, a band suppression filter, and a bandpass filter in the IF frequency band of the receiving apparatus according to Embodiment 4
  • FIG. 17 is a block diagram showing a configuration of a receiving apparatus according to Embodiment 5 of the present invention.
  • FIG. 2 is a block diagram showing a configuration of receiving apparatus 100 according to Embodiment 1 of the present invention.
  • the receiving apparatus 100 shown in FIG. 2 includes an antenna 101, an antenna sharing unit 102, a low noise amplification unit 103, a frequency conversion unit 104, a bandpass filter 105, an AGC (Auto Gain Control) 106, an oral signal oscillator 107, an orthogonal Demodulator 108, low-pass filter 109-1, low-pass filter 109-2, AZD converter 110-1, AZD converter 110-2, FFT unit 111, frequency selector 112, frequency variable local A signal oscillator 113 and a decoding unit 114 are provided.
  • AGC Automatic Gain Control
  • the antenna sharing unit 102 is illustrated as a receiving system in which the antenna 101 is configured by the above blocks. Share with a non-transmission system.
  • the low noise amplification unit 103 amplifies the received signal with low noise and outputs the amplified signal to the frequency conversion unit 104.
  • Frequency conversion section 104 multiplies the amplified received signal by a local signal output from frequency variable local signal oscillator 113 to convert it to an IF frequency, and outputs the converted IF signal to bandpass filter 105 To do.
  • the bandpass filter 105 limits the band of the IF signal and outputs the obtained IF signal to the AGC 106.
  • the AGC 106 adjusts the amplitude level of the IF signal to an optimum level by using the AZD conversion unit 110-1 and the AZD conversion unit 110-2 in the subsequent process, and orthogonally recovers the level-adjusted IF signal. Output to control unit 108.
  • the local signal oscillator 107 converts a local signal having a frequency f (MHz) into a quadrature demodulator 108.
  • the quadrature demodulator 108 converts the level-adjusted IF signal into I and Q baseband signals, and converts the obtained baseband signal into a low-pass filter 109-1 and a low-pass filter 109. — Output to 2.
  • the low-pass filter 109-1 and the low-pass filter 109-2 remove unnecessary components from the I and Q baseband signals, respectively, and obtain the obtained I and Q baseband signals. Output to AZD converter 110-1 and AZD converter 110-2.
  • the AZD conversion unit 110-1 and the AZD conversion unit 110-2 are used for I and Q baseband signals.
  • AZD conversion is performed, and the AZD converted I and Q baseband signals are output to the FFT unit 111.
  • the FFT unit 111 performs fast Fourier transform on the AZD-converted I and Q baseband signals to convert a time domain signal into a frequency domain signal.
  • the FFT unit 111 outputs the obtained frequency domain signal to the decoding unit 114.
  • Frequency selection section 112 measures the filter characteristics of bandpass filter 105 output from a filter characteristic measurement section (not shown) and the frequency arrangement of its own channel or the noise signal frequency measurement section (not shown). Noise based on the noise signal frequency and level
  • the control frequency ⁇ ⁇ that controls the frequency of the frequency variable low-power signal oscillator 113 is selected so that the signal shifts to the suppression band of the bandpass filter 105. For example, when there is a signal of a system other than the OFDM signal constantly in the reception environment, the frequency selection unit 112 selects the control frequency ⁇ ⁇ using the frequency of the signal of the other system as the frequency of the noise signal.
  • the frequency selection unit 112 outputs a control signal for shifting the frequency by ⁇ to the variable frequency local signal oscillator 113 and outputs the information about the control frequency ⁇ f to the decoding unit 114.
  • variable frequency local signal oscillator 113 generates a local signal having a frequency f ⁇ f ⁇ ⁇ (MHz) based on the control signal output from the frequency selection unit 112 and performs frequency conversion.
  • f represents the center frequency of the OFDM signal
  • ⁇ ⁇ represents the control frequency selected by the frequency selection unit 112.
  • Decoding section 114 performs OFDM decoding on the signal converted to the frequency domain. At this time, based on the information on the control frequency ⁇ output from the frequency selection unit 112, the subcarrier to which the information data is assigned is selected, and OFDM decoding is performed. Subcarrier selection will be described in detail later. Decoding section 114 outputs the received data obtained to the subsequent process.
  • the OFDM signal is output to low noise amplification section 103 via antenna 101 and antenna sharing section 102. Then, the received signal is amplified by low noise amplification section 103 and output to frequency conversion section 104.
  • the amplified received signal is multiplied by the local signal output from the frequency variable local signal oscillator 113 by the frequency converter 104 and converted to an IF frequency, and the converted IF signal is converted into a bandpass filter 105. Is output.
  • the frequency of the local signal output from the frequency variable low-power signal oscillator 113 is shifted by the control frequency ⁇ f selected by the frequency selector 112. The selection of the control frequency ⁇ f controlled by the frequency selection unit 112 will be described in detail later.
  • a control signal for shifting the frequency by ⁇ ⁇ is output to frequency variable local signal oscillator 113, and information about control frequency ⁇ ⁇ is output to decoding unit 114. Is done.
  • the IF signal converted to the IF frequency is band-limited by the bandpass filter 105, and the obtained IF signal is output to the AGC 106. And by AGC106, I
  • the F signal is adjusted to an optimum level by the AZD conversion unit 110-1 and the AZD conversion unit 110-2, and is output to the quadrature demodulation unit 108.
  • the level-adjusted IF signal is multiplied by a local signal from which the local signal oscillator 107 output is also output by the quadrature demodulator 108, and converted into an I and Q baseband signal.
  • the I and Q baseband signals pass through the low-pass filter 109-1 and the low-pass filter 109-2, respectively, and then pass through the AZD converter 110-1 and the AZD converter 110-2.
  • AZD conversion is performed and output to FFT section 111.
  • the I and Q baseband signals are converted into signals in the time domain force frequency domain by the FFT unit 111, and the frequency domain signal is output to the decoding unit 114.
  • the decoding unit 114 Based on the control frequency ⁇ output from the frequency selection unit 112, the decoding unit 114 selects a subcarrier to which the information data is assigned, and performs OFDM decoding. Received data obtained by OFDM decoding is output to a subsequent process.
  • FIG. 3A shows frequency characteristics of an OFDM signal having a center frequency f (MHz) and a signal bandwidth of 50 MHz composed of 682 subcarriers (USC).
  • the horizontal axis represents frequency (MHz)
  • the second horizontal axis represents subcarrier (SB) number
  • the vertical axis represents power (dBm).
  • a time domain signal is generated from a frequency domain signal by IFFT (Inverse Fast Fourier Transform).
  • Time domain signals are often calculated using the number of power subcarriers.
  • the OFDM signal is often not composed of a power of 2 subcarrier due to the limitation of the subcarrier spacing due to the phase noise of the local frequency. Therefore, the transmitting apparatus assigns null data to subcarriers, and generates a power-of-two subcarrier. Specifically, 682 subs as shown in Figure 3A.
  • An OFDM signal with a signal bandwidth of 50 MHz consisting of carriers is assigned information data only to 682 subcarriers out of 1024 subcarriers, and the remaining 342 subcarriers are assigned null data as unused subcarriers. Thus, the power of unused subcarriers is generated with zero. As a result, in the radio frequency band, an OFDM signal composed of 682 subcarriers is transmitted with a signal bandwidth of 50 MHz.
  • FIG. 3A Figures 3B, 3C, and 3D show f -f (MHz), f -f + 12.5 (MHz), and f --f --12. 5 (MHz) local signal c if c if c if
  • FIGS. 3B, 3C, and 3D The frequency characteristics of the baseband signal multiplied by the local signal (MHz) and input to the low-pass filter 109-1 and low-pass filter 109-2 are shown.
  • the horizontal axis represents frequency (MHz)
  • the second horizontal axis represents subcarrier (SB) number
  • the vertical axis represents power (dBm). Show me.
  • the decoding unit 114 selects and demodulates the used subcarriers to which the information data is assigned, so that the receiving apparatus 100 can perform frequency characteristics shown in FIGS. 3B, 3C, and 3D. Any baseband signal with can be demodulated.
  • information data is obtained by selecting subcarrier numbers 172 to 853 as used subcarriers and performing OFDM decoding in the same manner as the OFDM signal shown in FIG. 3A. Can be decrypted.
  • information data can be decoded by selecting subcarrier numbers 1 to 682 as used subcarriers and performing OFDM decoding.
  • information data can be decoded by selecting subcarrier numbers 342 to 1024 as used subcarriers and performing OFDM decoding.
  • the frequency band in which the power of 2 subcarrier power used in the fast Fourier transform is also configured that is, the subcarrier used is included in the frequency range that can be decoded in decoder 114.
  • the decoding unit 114 correctly detects the used subcarriers, so that all the used subcarriers are detected. It is possible to decrypt information data using For example, for an OF DM signal as shown in FIG. 3A, if the control frequency ⁇ ⁇ satisfies ⁇ 12.5 ⁇ ⁇ ⁇ 12.5 ⁇ ( ⁇ ), the subcarrier to which the information data is assigned is assigned. It is possible to decrypt information data using all of these.
  • the receiving operation when receiving apparatus 100 receives an OFDM signal and a noise signal as shown in FIG. 4 will be described.
  • the horizontal axis shows the frequency (MHz)
  • the vertical axis shows the noise signal in the vicinity of the OFDM signal with power (dBm)
  • center frequency f (MHz) center frequency f (MHz)
  • bandwidth 50MHz bandwidth 50MHz.
  • the noise signal is 57MHz higher than its center frequency f (MHz) force and has a bandwidth of 12MHz.
  • the sampling frequency f of the AZD conversion unit 110-1 and the AZD conversion unit 110-2 is 75 MHz. At this time, the received signal s in the IF frequency band of receiving apparatus 100
  • Figure 5A shows the frequency characteristics of the signal.
  • the horizontal axis represents frequency (MHz)
  • the vertical axis represents signal level (dBm)
  • the second vertical axis represents filter suppression (dB). Note that the horizontal axis is the frequency (MHz) and the vertical axis is the signal level (dB).
  • the second vertical axis represents the amount of filter suppression (dB).
  • FIG. 5A shows the OFDM signal, the filter characteristics of the bandpass filter 105, the noise signal, and the noise signal after passing through the bandpass filter 105 as the desired signal, filter characteristics, neighborhood noise, and input noise, respectively. Show me.
  • FIG. 5B shows the frequency characteristics of the desired signal and input noise in the baseband frequency band output from quadrature demodulator 108.
  • FIG. 6A is a graph obtained when the slope of the suppression characteristic of the bandpass filter 105 is relaxed compared to FIG. 5A. Shows the frequency characteristics of the received signal in the IF frequency band. From FIG. 6A, it can be seen that the input noise after passing through the band-pass filter 105 is larger than that in FIG. 5A. As shown in Fig. 6B, the noise signal level that is folded back in the band is also large, so the quality of the desired signal deteriorates due to the relaxation of the filter characteristics.
  • the frequency of the frequency variable local signal oscillator 113 is f -f -6.25 (MHz).
  • FIG. 7B shows frequency characteristics of the received signal in the baseband frequency band. As shown in Fig. 7B, it can be seen that the signal level folded back in the band is lower than that in Fig. 6B.
  • control frequency ⁇ ⁇ is within the range of ⁇ 12.5 ⁇ ⁇ ⁇ ⁇ 12.5 ⁇ (MHz)
  • the subcarrier is appropriately selected based on the control frequency ⁇ ⁇ . This makes it possible to OFDM-decode the desired signal.
  • the frequency of the variable frequency local signal oscillator 115 is set to f f 6.
  • the frequency of frequency variable local signal oscillator 113 is controlled using “OFDM signal subcarrier offset demodulation” to filter undesired signals in the filter suppression band. Shift to, and OFDM decode.
  • OFDM signal subcarrier offset demodulation to filter undesired signals in the filter suppression band. Shift to, and OFDM decode.
  • the OFDM signal may also be used when converting to the baseband frequency band by direct conversion without converting to the IF frequency band.
  • subcarrier offset demodulation even when the filter characteristics of the low-pass filter deteriorate, it is possible to suppress the undesired signal by avoiding the performance deterioration of the filter characteristics and perform OFDM decoding. Become.
  • a filter output from a filter characteristic measurement unit (not shown).
  • the filter characteristic may be predicted using a temperature sensor.
  • devices such as SAW filters predict the fluctuation of the center frequency according to the temperature at which the center frequency fluctuates according to the temperature, and apply “OFDM signal subcarrier offset demodulation” as described above. The same effect as the OFDM receiver shown in Fig. 2 can be obtained.
  • Embodiment 2 of the present invention is that the frequency of the undesired signal is estimated and the undesired signal is shifted to the suppression band of the band limiting filter.
  • FIG. 10 is a block diagram showing a configuration of receiving apparatus 100 according to Embodiment 2 of the present invention.
  • the same components as in FIG. 2 are assigned the same reference numerals as those in FIG. 10 employs a configuration in which a frequency selection unit 202 is provided instead of the frequency selection unit 112 and a noise measurement unit 201 is added to FIG.
  • the noise measuring unit 201 measures the signal power to noise power ratio of the noise signal in the vicinity of the desired signal for each frequency component, and the measured signal power to noise power. Frequency components whose ratio is equal to or greater than a predetermined threshold are determined (estimated) as noise signal frequencies. Regarding the measurement of the signal power-to-noise power ratio and the frequency of the noise signal in the noise measuring unit 201, the case where the bandpass filter 105 has the filter characteristics as shown in FIG. 5A and receives a signal as shown in FIG. To do.
  • the frequency characteristics of the desired signal and input noise in several bands are as shown in Fig. 5B.
  • the FFT unit 111 performs fast Fourier transform on the signal shown in FIG. 5B
  • the frequency characteristics of the output after the fast Fourier transform are shown in FIG.
  • the noise measurement unit 201 measures the signal power to noise power ratio in unused subcarriers for each carrier, and the measurement result power also determines (estimates) the frequency of the noise signal. For example, when the noise measurement unit 201 detects that the signal power-to-noise power ratio is equal to or higher than a predetermined threshold when the subcarrier number 1 of the unused subcarriers is also 172 as shown in FIG. 11, noise is detected in the frequency domain.
  • the signal exists or is higher frequency than the desired signal
  • There is a noise signal and it is estimated that the level has increased due to the aliasing, and the frequency of the noise signal is estimated.
  • the noise measurement unit 201 outputs the estimated frequency of the noise signal and the signal power to noise power ratio to the frequency selection unit 202.
  • the estimation method of the noise signal frequency and the signal power to noise power ratio is not limited to this, and other estimation methods may be used.
  • the frequency selection unit 202 is a frequency variable local signal oscillator so as to shift a noise signal having a measured signal power-to-noise power ratio for each carrier equal to or higher than a predetermined threshold to the suppression band of the bandpass filter 105. Select the control frequency ⁇ f that controls the frequency of 113. Then, the frequency selection unit 202 outputs a control signal for shifting the frequency by ⁇ to the frequency variable local signal oscillator 113, and outputs information about the control frequency ⁇ f to the decoding unit 114. .
  • the OFDM signal is output to low noise amplification section 103 via antenna 101 and antenna sharing section 102. Then, the received signal is amplified by low noise amplification section 103 and output to frequency conversion section 104.
  • the amplified received signal is multiplied by the local signal output from the frequency variable local signal oscillator 113 by the frequency converter 104 and converted to an IF frequency, and the converted IF signal is converted into a bandpass filter 105. Is output.
  • the frequency of the local signal output from the frequency variable low-power signal oscillator 113 is shifted by the control frequency ⁇ ⁇ selected by the frequency selector 202.
  • the control frequency ⁇ ⁇ is selected from the level of the noise signal estimated by the noise measuring unit 201 so that a noise signal having a level equal to or higher than a predetermined threshold is shifted to the suppression band of the bandpass filter 105.
  • a control signal for shifting the frequency by ⁇ ⁇ is output to frequency variable local signal oscillator 113, and information about control frequency ⁇ ⁇ is output to decoding unit 114.
  • the IF signal converted into the IF frequency is the same as in the first embodiment.
  • the bandpass filter 105, the AGC 106, the quadrature demodulation unit 108, the low-pass filter 109-1, and the low-pass filter The data is output to the FFT unit 111 via the filter 109-2, the AZD conversion unit 110-1 and the AZD conversion unit 110-2.
  • the I and Q baseband signals are converted into time domain power frequency domain signals by the FFT unit 111, and the frequency domain signals are output to the decoding unit 114.
  • the decoding unit 114 selects the subcarrier number to which the information data is assigned based on the information on the control frequency ⁇ output from the frequency selection unit 112, as in the first embodiment, and performs OFDM. Decryption is performed. The obtained received data is output to the later stage.
  • the frequency of the frequency variable local signal oscillator 113 is controlled by estimating the frequency of the undesired signal using “OFDM signal subcarrier offset demodulation”. Then, the undesired signal is shifted to the filter suppression band and subjected to OFDM decoding. As a result, even in an environment where the level and frequency of the undesired signal fluctuate, the undesired signal can always be suppressed and OFDM decoding can be performed, and reception performance can be improved.
  • Embodiment 3 of the present invention is that the subcarrier with the lowest level is detected and the subcarrier with the lowest level is shifted to the suppression band of the filter characteristics.
  • FIG. 12 is a block diagram showing the configuration of the receiving apparatus according to Embodiment 3 of the present invention.
  • FIG. 12 shows a direct conversion receiving device.
  • AGC106, low-pass filter 109-1, low-pass filter 109-1, and frequency selector 112 are replaced with AGC302- 1, AGC302-2, low-pass filter 301-1, 1, low-pass filter 301-2, and frequency selector 30 4; frequency converter 104, bandpass filter 105, and local signal oscillator 1 07 Is deleted, and the level determination unit 303 is added.
  • the low-pass filter 301-1 and the low-pass filter 301-2 remove unnecessary components from the I and Q baseband signals, respectively, and use the obtained I and Q baseband signals. Output to AGC302-1 and AGC302-2. Note that the low-pass filter 301-1 and The low-pass filter 301-2 has a configuration that cuts the DC component by placing a capacitor in series in the signal transmission path (C coupling) to avoid DC offset caused by local signal leakage. Have it.
  • Level determination section 303 measures the signal level of each subcarrier from the frequency domain signal after the fast Fourier transform, and determines the subcarrier with the lowest reception level. Level determination section 303 outputs information about the determined subcarrier frequency to frequency selection section 304.
  • the frequency selection unit 304 uses the frequency of the subcarrier with the lowest reception level determined by the level determination unit 303 to determine whether the subcarrier is a low-pass filter 301-1 and a low-pass filter 301-2.
  • the control frequency ⁇ ⁇ of the variable frequency local signal oscillator 113 is selected so as to coincide with the suppression band. Then, the frequency selection unit 304 outputs a control signal for shifting the frequency by ⁇ ⁇ to the frequency variable local signal oscillator 113 and outputs the information about the control frequency ⁇ f to the decoding unit 114.
  • the OFDM signal is output to low noise amplification section 103 via antenna 101 and antenna sharing section 102. Then, the received signal is amplified by the low noise amplification unit 103 and output to the frequency modulation unit 108.
  • the amplified received signal is multiplied by the local signal output from frequency variable local signal oscillator 113 by frequency demodulator 108 and converted to an I or Q baseband signal.
  • the converted baseband signal is output to the low-pass filter 301-1 and the low-pass filter 301-2.
  • the frequency of the local signal output from the frequency variable local signal oscillator 113 is shifted by the control frequency ⁇ f selected by the frequency selection unit 304. Selection of the control frequency ⁇ f by the frequency selection unit 304 will be described with reference to FIG.
  • FIG. 13 shows a signal in the frequency domain after the fast Fourier transform output from the FFT unit 111, where the horizontal axis indicates the subcarrier number and the vertical axis indicates the signal level.
  • the horizontal axis indicates the subcarrier number
  • the vertical axis indicates the signal level.
  • FIG. 13 it is generally known that mobile communication has a frequency band in which the reception level drops due to propagation conditions such as fading.
  • Figure 13 shows the frequency band with subcarrier number 520. This shows how the signal level drops in the area.
  • the frequency selection unit 304 makes the frequency of the subcarrier number 520 having the lowest reception level match the suppression band of the low-pass filter 301-1 and the low-pass filter 301-2.
  • the control frequency ⁇ ⁇ for controlling the frequency of the frequency variable type local signal generator 113 is selected.
  • the frequency at which the signal level drops varies with time, the frequency at which the reception level drops is always detected by the level determination unit 303, and the frequency at which the reception level drops is detected by the bandpass filter 301-.
  • the control frequency ⁇ f in the frequency selection unit 304 so as to coincide with the suppression band of the first and low-pass filters 301-2, it is possible to mitigate the deterioration in reception performance.
  • a control signal for shifting the frequency by ⁇ ⁇ is output to frequency variable local signal oscillator 113, and information about control frequency ⁇ ⁇ is output to decoding unit 114.
  • the baseband signal is output to the FFT unit 111 via the AGC 302-1 and AGC 302-2, the AZD conversion unit 110-1 and the AZD conversion unit 110-2.
  • the FFT unit 111 converts the I and Q baseband signals into a signal in the time domain force frequency domain, and outputs the signal in the frequency domain to the decoding unit 114.
  • the decoding unit 114 selects the subcarrier number to which the information data is assigned based on the information regarding the control frequency ⁇ output from the frequency selection unit 304, and performs OFDM. Decryption is performed. The obtained received data is output to the later stage.
  • the subcarrier with the minimum received signal strength after fast Fourier transform is detected, and the frequency variable type is detected.
  • the carrier having the lowest reception level is shifted to the suppression band of the band limiting filter, and OFDM decoding is performed.
  • the carrier with the lowest reception level is suppressed by the band limiting filter, and the carrier with the higher reception level is used for decoding, so that the degradation in reception performance can be reduced.
  • Embodiment 4 of the present invention is that the frequency of the undesired signal is shifted to the suppression band of the band suppression filter.
  • FIG. 14 is a block diagram showing the configuration of the receiving apparatus according to Embodiment 4 of the present invention.
  • the same reference numerals as those in FIG. FIG. 14 shows a receiving apparatus that performs undersampling.
  • the bandpass filter 105, AGC 106, AZD conversion unit 110-1, 80 conversion unit 110-2, and frequency selection unit 112 are replaced with AGC402.
  • the band pass filter 403, the AZD conversion unit 404, and the frequency selection unit 405 are provided, and the band suppression filter 401 is added.
  • the band suppression filter 401 suppresses a narrowband undesired signal.
  • the IF signal after passing through the band suppression filter 401 is output to the AGC 402.
  • AGC 402 converts the level of the IF signal to an optimum level in AZD conversion section 404, and outputs the level-converted IF signal to bandpass filter 403.
  • the bandpass filter 403 removes unnecessary components from the IF signal and outputs the obtained IF signal to the AZD conversion unit 404.
  • the AZD conversion unit 404 performs undersampling on the IF signal. Undersampling is performed using a frequency lower than the frequency of the IF signal. For this reason, the aliasing component of the desired signal and the aliasing component of the undesired signal included in the IF signal may overlap, and the desired signal may not be reproduced. This will be specifically described below with reference to FIG. In FIG. 15, the horizontal axis represents frequency and the vertical axis represents signal level.
  • FIG. 15A shows the frequency characteristics of the desired signal and undesired signal in the radio frequency band
  • FIG. 15B shows the frequency characteristics of the desired signal and undesired signal after undersampling. As shown in Fig. 15B, it can be seen that the undesired signal may be superimposed on the desired signal after undersampling. For this reason, it is effective to exclude the undesired signal by band limiting by the band suppression filter 401 before the undersampling is performed.
  • Frequency selection section 405 is measured by a band suppression filter characteristic measurement section (not shown). Based on the characteristics of the band suppression filter 401, the control frequency ⁇ ⁇ that controls the frequency of the frequency variable local signal oscillator 113 is selected so that the undesired signal is shifted to the suppression band of the filter. Thereby, the frequency of the undesired signal is shifted to the suppression band of the band suppression filter 401, and the undesired signal can be efficiently suppressed.
  • frequency selection section 405 outputs a control signal for shifting the frequency by ⁇ to frequency variable local signal oscillator 113 and also decodes the information for control frequency ⁇ f. Output to.
  • the OFDM signal is output to low noise amplification section 103 via antenna 101 and antenna sharing section 102. Then, the received signal is amplified by low noise amplification section 103 and output to frequency conversion section 104.
  • the amplified received signal is multiplied by the local signal output from the frequency variable local signal oscillator 113 by the frequency conversion unit 104 and converted to an IF frequency, and the converted IF signal is converted into the band suppression filter 401. Is output.
  • FIG. 16 shows the frequency characteristics of the desired signal and the undesired signal output from frequency converter 104 and the frequency characteristics of band suppression filter 401 and bandpass filter 403.
  • FIG. 16 shows that the suppression band of the band suppression filter 401 does not match the frequency of the undesired signal.
  • the band suppression filter 401 is a resonance circuit, and there is a variation in the frequency characteristics in which the band where the amount of attenuation can be taken is narrow, so the frequency of the undesired signal and the suppression band of the band suppression filter 401 are In some cases, there is a case.
  • the suppression band of the band suppression filter measured by the filter characteristic measurement unit (not shown) matches the frequency of the undesired signal measured by the undesired signal measurement unit (not shown).
  • the frequency selection unit 405 selects the control frequency ⁇ ⁇ of the frequency of the local signal output from the variable frequency local signal oscillator 113.
  • the undesired signal is removed in the previous stage of undersampling, and it is possible to reduce the deterioration of the reception performance in which the desired signal and the undesired signal are not superimposed after undersampling.
  • a control signal for shifting the frequency by ⁇ ⁇ is output to frequency variable local signal oscillator 113, and information about control frequency ⁇ ⁇ is output to decoding unit 114.
  • the IF signal after passing through the filter suppression filter 401 is output to the AZD conversion unit 404 via the band suppression filter 401, AG C402, and bandpass filter 403. Then, the AZD conversion unit 404 performs oversampling on the IF signal, and the quadrature modulator 108 converts it into I and Q baseband signals.
  • the I and Q baseband signals pass through the low-pass filters 109-1 and 109-2 and are output to the FFT unit 111, respectively. Then, the FFT unit 111 converts the I and Q baseband signals into a time domain force frequency domain signal and outputs the frequency domain signal to the decoding unit 114.
  • the decoding unit 114 selects the subcarrier number to which the information data is assigned based on the information regarding the control frequency ⁇ ⁇ output from the frequency selection unit 405, and transmits the OFDM Decryption is performed. Then, the received data obtained by the decoding unit 114 is output to a subsequent process.
  • the frequency of the frequency variable local signal oscillator 113 is controlled using “OFDM signal subcarrier offset demodulation”, and the frequency of the undesired signal is set to the band. Shift to the suppression band of the suppression filter and perform OFDM decoding.
  • OFDM signal subcarrier offset demodulation the frequency of the undesired signal is set to the band. Shift to the suppression band of the suppression filter and perform OFDM decoding.
  • the power described for the receiver using undersampling is not limited to this, and by performing frequency conversion so that the undesired signal matches the suppression band of the band suppression filter, other sampling is performed. The same effect can be obtained when the method is used.
  • a feature of Embodiment 5 of the present invention is that, in a composite receiving apparatus having a function of receiving a modulated signal of another system having a wider signal band than the OFDM signal band, when receiving an OFDM signal, the undesired signal is wideband. In the suppression band of the band limit filter optimal for the signal It is to do.
  • FIG. 17 is a block diagram showing a configuration of receiving apparatus 500 according to Embodiment 5 of the present invention.
  • the receiving apparatus shown in FIG. 17 is a composite receiving apparatus having a function of receiving a modulated signal (for example, a CDMA signal) of another system having a wider signal band than the OFDM signal band.
  • a modulated signal for example, a CDMA signal
  • the same reference numerals as those in FIG. FIG. 17 differs from FIG. 12 in that a low-pass filter 501-1, a low-pass filter 301-1, a low-pass filter 301-1, and a frequency selector 112 are replaced with a low-pass filter 501-1.
  • a configuration is employed in which a filter 501-2 and a frequency selection unit 504 are included, the level determination unit 303 is deleted, and a system selection unit 502 and another system decoding unit 503 are added.
  • the low-pass filter 501-1 and the low-pass filter 501-2 perform band limitation on both OFDM signals having different signal bands and modulation signals of other systems. Since receiving apparatus 500 limits the band of both modulated signals having different signal bands, the pass band has a wide signal band and is optimal for modulated signals of other systems.
  • the system selection unit 502 uses the FFT unit 111 or the baseband signals I and Q output from the AZD conversion unit 110-1 and the AZD conversion unit 110-2 based on instruction information not shown. Is output to the other system decoding unit 503.
  • the instruction information indicates the modulation method of the signal received by receiving apparatus 500.
  • system selection unit 502 outputs I and Q baseband signals to FFT unit 111, and other systems
  • the modulated signal of I the baseband signals of I and Q are output to other system decoding section 503. Further, the system selection unit 502 outputs the instruction information to the frequency selection unit 504.
  • Other system decoding section 503 performs a decoding process on the baseband signal using a decoding method applied in the other system, and outputs the received data obtained to the subsequent process.
  • Frequency selection section 504 selects control frequency ⁇ ⁇ of variable frequency local signal oscillator 113 based on the instruction information. Specifically, when the indication information indicates an OFDM modulation system, the frequency selection unit 504 makes the frequency of the undesired signal coincide with the suppression band of the filter characteristic output from the filter characteristic measurement unit (not shown). The control frequency ⁇ ⁇ of the frequency variable type local signal oscillator 113 is selected. As mentioned above, the low pass type The filter band of the filter 501-1 and the low-pass filter 501-2 has a wide signal band, and is suitable for the modulation signal of other systems.
  • the undesired signal can be suppressed while sharing the band limiting filter by shifting the undesired signal to the suppression band of the low-pass filter 501-1 and the low-pass filter 501-2. Is possible. As a result, it is not necessary to prepare a band-limiting filter for each system, which enables downsizing and cost reduction.
  • the OFDM signal is output to the low noise amplifying unit 103 via the antenna 101 and the antenna sharing unit 102. Then, the received signal is amplified by the low noise amplification unit 103 and output to the frequency modulation unit 108.
  • the amplified received signal is multiplied by the local signal output from the frequency variable local signal oscillator 113 by the frequency demodulator 108, converted into an I and Q baseband signal, and converted into a converted baseband signal.
  • the signal is output to the low-pass filter 501-1 and the low-pass filter 501-2.
  • the frequency of the local signal output from the frequency variable local signal oscillator 113 is shifted by the control frequency ⁇ ⁇ selected by the frequency selection unit 504.
  • the control frequency ⁇ ⁇ is selected so that the undesired signal is shifted to the suppression band of the filter characteristic output from the filter characteristic measurement unit (not shown).
  • Control frequency ⁇ ⁇ selected by frequency selection section 504 is output to frequency variable local signal oscillator 113 and also output to decoding section 114.
  • the baseband signal is output to system selection unit 502 via AGC302-1, AGC302-2, AZD conversion unit 110-1, and AZD conversion unit 110-2.
  • the baseband signal is obtained from the instruction information (not shown) by the system selection unit 502.
  • the baseband signal output to FFT section 111 is converted from a time domain signal to a frequency domain signal, and the frequency domain signal is output to decoding section 114.
  • the output from the frequency selection unit 112 is performed by the decoding unit 114 in the same manner as in the first embodiment.
  • the subcarrier number to which the information data is assigned is selected, and OFDM decoding is performed.
  • the received data obtained by the decoding unit 114 is output to a subsequent process.
  • the baseband signal output to other system decoding section 503 is subjected to the decoding system of the other system, and the obtained received data is output to the subsequent process.
  • the undesired signal is converted into a suppression characteristic of a band-limited filter suitable for other systems.
  • the frequency of the frequency variable local signal oscillator 113 is controlled so as to match, and OFDM decoding is performed. As a result, it is possible to share the band limiting filter with other systems, which enables downsizing and cost reduction.
  • the low-pass filter 501-1 and the low-pass filter 501-2 have the OFDM signal power after passing through the latter FFT unit 111. If the frequency is within the decodable frequency range, a frequency change that again shifts the frequency of the OFDM signal is placed downstream of the low-pass filter 501-1 and the low-pass filter 501-2. It may be provided. As a result, the OFDM signal in which the undesired signal is suppressed is shifted again to a decodable frequency range, and as a result, all carriers to which information data is allocated can be used for decoding, and reception performance is improved. Deterioration can be prevented.
  • the receiving apparatus includes a receiving means for receiving a signal including frequency components corresponding to a plurality of carriers to which information data is assigned, and all of the reception signals.
  • Frequency conversion means for shifting the frequency of the frequency component, a filter for suppressing the frequency after frequency shift of some of the frequency components included in the received signal, and the plurality of carriers among the frequency components remaining without being suppressed
  • Decoding means for decoding the frequency component corresponding to the frequency component, and the frequency conversion means matches the frequency of the undesired frequency component whose reception quality does not meet a predetermined standard with the frequency suppressed by the filter. Take the configuration.
  • the frequency shift is performed by shifting the frequencies of all the frequency components included in the signal including the frequency components corresponding to the plurality of carriers to which the information data is assigned.
  • the frequency of the undesired frequency component whose reception quality does not satisfy a predetermined standard is suppressed by the filter, and the frequency components remaining without being suppressed are applied to a plurality of carriers.
  • the deterioration of the filter characteristic can be reduced without requiring a circuit for correcting the deterioration of the filter characteristic.
  • the frequency of undesired frequency components can be suppressed, and reception performance can be improved.
  • the frequency conversion unit may convert frequency components other than frequency components corresponding to the plurality of carriers to undesired frequency components.
  • the configuration is as follows.
  • the frequency conversion means measures a signal power to noise power ratio for each frequency component included in the received signal. And a noise measurement unit, wherein a frequency component having a measured signal power to noise power ratio equal to or greater than a predetermined threshold is used as an undesired frequency component.
  • the noise level included in the received signal is estimated, and the frequency component corresponding to the noise whose estimated level is equal to or greater than the predetermined threshold is set as the undesired frequency component. Even in an environment where the frequency fluctuates, it is always possible to improve the reception performance by suppressing the frequency component corresponding to the noise whose estimated level is equal to or higher than a predetermined threshold and suppressing it.
  • the frequency conversion means measures the level for each frequency component corresponding to the plurality of carriers.
  • the frequency component with the lowest measured level is the undesired frequency component.
  • the level of each frequency component corresponding to a plurality of carriers to which information data is assigned is measured, and the frequency component with the smallest measured level is determined as an undesired frequency. Because it is a component, among the frequency components corresponding to multiple carriers, the frequency component with the highest level is not suppressed, and only the frequency component with the lowest reception level is suppressed. Can be reduced.
  • the frequency conversion means uses the decoding means to determine the frequencies of all frequency components corresponding to the plurality of carriers. A configuration is adopted that shifts to a frequency range that can be decoded.
  • the frequencies of all the frequency components corresponding to the plurality of carriers to which the information data is allocated are shifted to the range of frequencies that can be decoded. All frequency components corresponding to the carrier can be used for decoding.
  • the decoding means corresponds to the plurality of carriers based on a frequency shift amount by the frequency converting means. Select a frequency component to be decoded and decode the selected frequency component
  • the decoding means has a frequency component frequency that remains without being suppressed within a frequency range that can be decoded.
  • a re-frequency conversion unit that shifts again, and adopts a configuration for decoding frequency components corresponding to the plurality of carriers after the re-frequency shift.
  • the frequency of the frequency component that remains without being suppressed is shifted again to a decodable frequency range, and it corresponds to a plurality of carriers to which information data after re-frequency shift is assigned. Even when a filter with a wider pass band than the signal bands of multiple carriers to which information data is assigned is used, the frequency of the undesired frequency component is suppressed and the information data is assigned. All the frequency components of multiple received carriers can be used for decoding, and deterioration of reception performance can be prevented. it can.
  • the signal band is wider than the signal bands of multiple carriers to which information data is assigned, and a composite receiver having a function of receiving a modulated signal of another system can share a filter. As a result, downsizing and low cost can be achieved.
  • the reception method includes a reception step of receiving a signal including frequency components corresponding to a plurality of carriers to which information data is allocated, and all of the reception signals.
  • the frequencies of all frequency components included in a signal including frequency components corresponding to a plurality of carriers to which information data is assigned are shifted and included in the received signal after the frequency shift.
  • the frequency of undesired frequency components whose received quality does not meet a predetermined standard is suppressed by the filter, and the frequency components corresponding to multiple carriers are decoded from the remaining frequency components without being suppressed.
  • the frequency of the undesired frequency component can be reduced by reducing the deterioration of the filter characteristics without requiring a circuit for correcting the deterioration of the filter characteristics. It is possible to suppress it and improve the reception performance.
  • the receiving apparatus and the receiving method of the present invention can suppress undesired signals even in the case of using a band limiting filter in which the suppression characteristics are not steep and the frequency characteristics vary in multicarrier communication. For example, it is useful for a receiving apparatus and a receiving method in a system to which multicarrier communication is applied.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)

Abstract

L’invention concerne un appareil de réception capable de supprimer les signaux indésirés même lorsque l’on utilise un filtre limiteur de bande, dont la caractéristique de suppression n’est pas très marquée et qui présente une variation de caractéristique de fréquence, dans une communication multiporteuse. Dans cet appareil, une pièce de sélection de fréquence (112) sélectionne une fréquence de commande (Δf), qui gère la fréquence d’un oscillateur de signal local variable en fréquence (113), pour qu’un signal de bruit passe à une bande de suppression du filtre limiteur de bande. La pièce de sélection de fréquence (112) envoie le signal de commande, devant décaler la fréquence de (Δf), vers l’oscillateur de signal local variable en fréquence (113), tout en envoyant des informations sur la fréquence de commande (Δf) à une pièce de décodage (114). La pièce de décodage (114) sélectionne, sur la base des informations de la fréquence de commande (Δf) à partir de la pièce de sélection de fréquence (112), une sous-porteuse à laquelle sont assignées des données d’informations, réalisant ainsi un décodage OFDM.
PCT/JP2006/313784 2005-07-12 2006-07-11 Appareil de réception et procédé de réception WO2007007761A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2086116A2 (fr) * 2008-01-31 2009-08-05 ST Wireless SA Procédé et agencement pour le traitement de signaux dans un récepteur pouvant être réglé sur différentes porteuses
EP2398151A1 (fr) * 2010-06-21 2011-12-21 Nxp B.V. Appareil de récepteur radio et procédé de fonctionnement de l'appareil
TWI826409B (zh) * 2017-12-20 2023-12-21 南韓商三星電子股份有限公司 操作無線通訊設備的方法、無線通訊設備以及非暫態處理器可讀儲存媒體

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100969665B1 (ko) 2008-11-18 2010-07-14 주식회사 텔레칩스 Ｏｆｄｍ 통신 시스템의 수신 성능 개선 장치 및 방법
JP2017169096A (ja) * 2016-03-17 2017-09-21 ソニー株式会社 信号受信チップ、信号受信方法、電子機器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000013357A (ja) * 1998-06-22 2000-01-14 Toshiba Corp Ｏｆｄｍ受信装置
JP2003018485A (ja) * 2001-07-05 2003-01-17 Kenwood Corp 受信機及び受信方法
JP2003259244A (ja) * 2002-02-27 2003-09-12 Fujitsu Ltd 地上波デジタル放送受信機
JP2004040295A (ja) * 2002-07-01 2004-02-05 Mitsubishi Electric Corp マルチキャリアｃｄｍａ通信システム及びその復調処理回路、受信装置、並びに復調処理方法及び受信方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000013357A (ja) * 1998-06-22 2000-01-14 Toshiba Corp Ｏｆｄｍ受信装置
JP2003018485A (ja) * 2001-07-05 2003-01-17 Kenwood Corp 受信機及び受信方法
JP2003259244A (ja) * 2002-02-27 2003-09-12 Fujitsu Ltd 地上波デジタル放送受信機
JP2004040295A (ja) * 2002-07-01 2004-02-05 Mitsubishi Electric Corp マルチキャリアｃｄｍａ通信システム及びその復調処理回路、受信装置、並びに復調処理方法及び受信方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2086116A2 (fr) * 2008-01-31 2009-08-05 ST Wireless SA Procédé et agencement pour le traitement de signaux dans un récepteur pouvant être réglé sur différentes porteuses
EP2086116A3 (fr) * 2008-01-31 2013-10-16 ST Wireless SA Procédé et agencement pour le traitement de signaux dans un récepteur pouvant être réglé sur différentes porteuses
EP2398151A1 (fr) * 2010-06-21 2011-12-21 Nxp B.V. Appareil de récepteur radio et procédé de fonctionnement de l'appareil
TWI826409B (zh) * 2017-12-20 2023-12-21 南韓商三星電子股份有限公司 操作無線通訊設備的方法、無線通訊設備以及非暫態處理器可讀儲存媒體

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