WO2006092859A1 - 受信装置、受信方法、プログラム、および、情報記録媒体 - Google Patents
受信装置、受信方法、プログラム、および、情報記録媒体 Download PDFInfo
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- WO2006092859A1 WO2006092859A1 PCT/JP2005/003534 JP2005003534W WO2006092859A1 WO 2006092859 A1 WO2006092859 A1 WO 2006092859A1 JP 2005003534 W JP2005003534 W JP 2005003534W WO 2006092859 A1 WO2006092859 A1 WO 2006092859A1
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- Prior art keywords
- signal
- receiving
- transmission
- demodulator
- demodulation
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Classifications
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- 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
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
Definitions
- Receiving device receiving method, program, and information recording medium
- the present invention relates to a receiving device and a receiving method suitable for improving the receiving sensitivity in spread spectrum communication or the like, a program for realizing these using a computer, and a computer-readable recording the program
- the present invention relates to an information recording medium.
- Non-Patent Document 1 Andrew I. Viterbi, CDMA-Principle of Spread Spectrum
- Patent Document 1 JP 2003-218834
- Patent Document 2 Japanese Patent Laid-Open No. 06-164547
- Patent Document 3 Japanese Patent Laid-Open No. 05-308344
- Non-Patent Document 1 proposes CDMA communication as a basic spread spectrum communication technique.
- Patent Document 1 lowers the high power jamming power mixed in the desired signal band, improves the ratio of the desired signal Z jamming signal after despreading, and reduces the suppression of reception sensitivity.
- the technology is disclosed.
- the AZD before despreading is performed when despreading and demodulating the received signal spectrum-spread by the mobile communication terminal after AZD (Analog / Digital) conversion.
- the frequency noise in the converted value is corrected using the preset value.
- Patent Document 3 discloses a technique related to a spread spectrum communication apparatus that is effective when a narrow-band undesired wave appears in a band.
- the received wave is AZD-transformed
- the obtained digital signal is Fourier-transformed
- predetermined arithmetic processing is performed to detect a narrowband undesired wave, and based on the detected value. Then, it is determined whether or not the undesired signal has exceeded the limit value of the acceptable range of communication quality.
- the invention according to the first aspect of the present invention includes a receiving unit, a first demodulating unit, a second demodulating unit, a selecting unit, and a decoding unit, and is configured as follows.
- the receiving unit receives a radio signal transmitted from the transmitting device by modulating the number of stages of multi-level key when changing the transmission signal according to the communication environment.
- the first demodulating unit power-demodulates the received radio signal into a digital signal having two or more values by analog Z digital conversion.
- the second demodulator converts the received radio signal into a binary digital signal by positive / negative. Demodulate after conversion.
- the selection unit selects a signal having a higher strength from the signal demodulated by the first demodulation unit and the signal demodulated by the second demodulation unit.
- the decoding unit decodes the transmission signal from the selected signal.
- the receiving device of the present invention further includes a notification unit that notifies the transmitting device of parameters of the communication environment based on the received radio signal, and the signal output by the second demodulating unit is selected by the selecting unit.
- the transmission device can be configured to transmit the transmission signal with a binary value and modulation of the force according to the parameters of the communication environment notified by the notification unit.
- the first demodulator and the second demodulator can be configured to perform spread spectrum demodulation by correlating with the pseudo-noise sequence.
- the first demodulator and the second demodulator can be configured to perform demodulation with OFDM synchronization by taking a correlation with a known sequence.
- the receiving apparatus of the present invention can be configured to include a recording unit that records the selected signal as a digital sequence in addition to the decoding unit.
- a reception method includes a reception step, a first demodulation step, a second demodulation step, a selection step, and a decoding step, and is configured as follows.
- the radio signal transmitted from the transmitting apparatus is received by performing modulation after changing the number of stages of multi-leveling at the time of multi-leveling the transmission signal according to the communication environment.
- the received radio signal is converted by analog Z-digital conversion.
- the signal is demodulated as a digital signal with two or more values.
- the received radio signal is converted into a binary digital signal by positive / negative to demodulate the power.
- the signal having the higher intensity is selected from the signal demodulated in the first demodulation step and the signal demodulated in the second demodulation step.
- the transmission signal is decoded from the selected signal.
- the reception method of the present invention further includes a notification step of notifying the transmission device of parameters of the communication environment based on the received radio signal, and the signal output in the second demodulation step is selected.
- the transmission device can be configured to binary-modulate and transmit the transmission signal according to the parameters of the communication environment notified in the notification step.
- the first demodulation step and the second demodulation step can be configured to perform spread spectrum demodulation by taking a correlation with the pseudo noise sequence.
- the first demodulation step and the second demodulation step can be configured to demodulate with OFDM synchronization by taking a correlation with a known sequence.
- the receiving method of the present invention can be configured to include a recording step of recording the selected signal as a digital sequence in addition to the decoding step.
- a program according to another aspect of the present invention is configured to cause a computer to function as each unit of the receiving device.
- a computer-readable information recording medium is configured to record the above-described program. For example, it can be recorded on a computer-readable information storage medium such as a compact disk, a flexible disk, a hard disk, a magneto-optical disk, a digital video disk, a magnetic tape, and a semiconductor memory.
- a computer-readable information storage medium such as a compact disk, a flexible disk, a hard disk, a magneto-optical disk, a digital video disk, a magnetic tape, and a semiconductor memory.
- the communication device is a computer such as a DSP (Digital Signal Processor) or FPGA (FPGA).
- DSP Digital Signal Processor
- FPGA Field-programmable gate array
- the receiver of the present invention When configured using software radio technology using a Field Programmable Gate Array), the receiver of the present invention is realized by executing the above program. It can be distributed and sold via a computer communication network. In addition, the information storage medium can be distributed and sold independently of the communication device.
- a receiving apparatus and a receiving method that are suitable for improving reception sensitivity in spread spectrum communication and the like, a program that implements these using a computer, and a computer-readable program that records the program An information recording medium can be provided.
- FIG. 1 is a schematic configuration diagram of a basic spread spectrum communication system.
- FIG. 2 is a schematic diagram showing a schematic configuration of a receiving apparatus according to an embodiment of the present invention.
- FIG. 4 is a graph showing a correspondence relationship between the input level of the AZD converter and the output level of the correlator when a “+” transmission signal is transmitted to the transmission apparatus.
- FIG. 5 is a graph showing the correspondence between the input level of the zero level detector and the output level of the correlator when a “+” transmission signal is issued in the transmission device.
- FIG. 6 is a graph showing the relationship between the output level (absolute value) of the frequency converter and the output level (absolute value) of the switch.
- FIG. 7 is an area diagram of transmission capacity expected from the radio base station in the present embodiment.
- FIG. 8 is a schematic diagram showing a schematic configuration of an embodiment in which the present invention is applied to a delay profile measuring apparatus for measuring a propagation path delay characteristic of mobile communication using spread spectrum.
- spread spectrum communication will be described as an example, but the principle of the present invention is that various communication systems such as a mobile communication system in which a multiple access method is added to OFDM.
- the present invention can also be applied to communication technology, and such embodiments are also included in the scope of the present invention.
- FIG. 1 is a schematic configuration diagram of a basic spread spectrum communication system. This will be described below with reference to this figure.
- the basic spread spectrum communication system 11 shown in this figure includes a transmitting apparatus 100 and a receiving apparatus 250.
- the transmission device 100 and the reception device 250 are configured inside one communication device.
- the transmitting apparatus 100 includes an encoder 101, a pseudo noise generator 102, a correlator 103, a frequency converter 104, a power amplifier 105, and an antenna 106.
- Encoder 101 encodes an input signal to be transmitted. At this time, error correction codes for reducing errors in the communication channel and multi-level keys for transmitting more information simultaneously when the propagation state is good are performed.
- the feedback of the propagation state is appropriately performed from the receiving apparatus 250 to the transmitting apparatus 100, and typically, the power of the received wave, the delay profile, etc.
- the parameters are notified.
- the transmission apparatus 100 refers to these parameters and changes the number of stages of the multi-value key.
- the pseudo noise generator 102 generates pseudo noise (also referred to as “pseudo noise”) by generating a random number.
- pseudo noise also referred to as “pseudo noise”
- various random number generation techniques such as the power that is most commonly used for M-sequences can be applied.
- the correlator 103 performs a spread spectrum by performing a correlation operation between the output of the encoder 101 and the output of the pseudo noise generator 102.
- the frequency converter 104 converts the output into a high-frequency signal, and the power amplifier 105 amplifies this to power necessary for communication, and wirelessly transmits the signal from the antenna 106 to the receiving device 250.
- the receiving apparatus 250 includes an antenna 201, a low noise amplifier 202, a frequency converter 203, an AZD converter 204, a pseudo noise generator 205, a correlator 206, and a decoder 213.
- the radio signal transmitted from the transmission device 100 is received by the antenna 201 and converted into a high-frequency electric signal, and the low-noise amplifier 202 amplifies this to power required for the subsequent processing.
- the frequency transformation 203 converts this into a baseband signal
- the AZD transformation 204 further converts it into a digital signal.
- the pseudo noise generator 205 in the receiving apparatus 250 generates the same pseudo noise in synchronization with the pseudo noise generator 102 in the transmitting apparatus 100.
- Correlator 206 performs a correlation operation between the digital signal and the pseudo noise, performs spectrum despreading, and reproduces the output of encoder 101 in transmitting apparatus 100.
- the decoder 213 performs an inverse operation of the encoder 101 on this result, whereby a transmitted signal is obtained.
- stray capacitances inherent in the AZD converter 204 cause quality degradation, and there is a trade-off relationship between the signal bandwidth and the number of bits. Therefore, even if you try to increase the number of bits of AZD variation 204 and process weaker radio waves with correlator 206, it is necessary to digitize wideband signals, especially in spread spectrum, so the number of bits is greatly increased. There are many cases where this is not possible.
- the reception device 250 can reproduce more reception level values.
- the number of reception level values that can be reproduced decreases.
- the transmission rate may be adaptively changed in accordance with the radio wave intensity in the receiving device 250, and in many cases.
- radio wave intensity information is shared between transmitting apparatus 100 and receiving apparatus 250, and the multilevel number of modulation in encoder 101 and decoder 213 is adaptively changed accordingly.
- radio field strength is high, it is possible to increase the transmission rate by increasing the modulation level, and to reduce the transmission rate by reducing the modulation level when the radio field strength is low. .
- a receiving apparatus having a configuration based on the receiving apparatus 250 in this basic spread spectrum communication system is employed.
- FIG. 2 is a schematic diagram showing a schematic configuration of the receiving apparatus according to the embodiment of the present invention. Less than
- Each element of the receiving apparatus 200 of the present embodiment has a considerable part in common with the element of the basic receiving apparatus 250. However, a path including a zero level detector 207 and a correlator 208 is prepared.
- the absolute value detectors 209 and 210, the comparator 211, and the switch 212 are newly provided.
- the switch 212 determines which of the two signal processing paths is selected. When the upper path in the figure is selected, the signal is transmitted from the antenna 201, the low-noise amplifier 202, and the frequency conversion. Since the processing is performed in the order of the converter 203, the AZD converter 204, the correlator 206, and the decoder 213, the operation is the same as the basic configuration shown in FIG. That is, the output of the pseudo noise generator 205 is given to the correlator 206 to perform spectrum despreading.
- the antenna 201, the low noise amplifier 202, the frequency converter 203, the zero level detector 207, the correlator 208, and the decoder 213 are processed in this order.
- the output of the pseudo noise generator 205 is given to the correlator 208, and spectrum despreading is performed.
- the zero level detector 207 performs binarization by detecting even a signal having a power smaller than the received power corresponding to the minimum bit value of the AZD converter 204 using a comparator. is there.
- the AZD variation 204 requires linearity between the input level signal and the output digital signal, whereas the zero level detector 207 determines only the positive / negative of the input signal. Therefore, the zero level detector 207 can detect even a signal level that is much smaller than the AZD conversion 204, for example, a signal that is less than 1/10 of the resolution of the AZD converter 204. .
- FIG. 3 is a graph showing the performance of the AZD converter 204. This will be described below with reference to this figure.
- the horizontal axis of the graph shown in the figure represents the analog input level of the AZD converter 204, and the vertical axis represents the output digital value. As shown in this figure, the trajectory 260 of the AZD conversion is stepped, and the output digital value is 0 near the analog input level origin.
- FIG. 4 is a graph showing a correspondence relationship between the input level of the AZD converter 204 and the output level of the correlator 206 when the transmission apparatus 100 generates a “+” transmission signal.
- the correspondence relationship when the transmission device 100 transmits a “one” transmission signal is obtained by reversing the positive and negative of the correspondence relationship shown in FIG.
- the horizontal axis of the graph shown in this figure is the input level of the AZD converter 204, and the vertical axis is the output level of the correlator 206.
- the correspondence locus 261 has a distorted staircase shape as shown in the figure.
- the output of the correlator 206 should not occur below the level corresponding to the minimum bit value of the AZD converter 204, but in reality, the probability of occurrence in the low noise amplifier 202 and the frequency converter 203
- the output of the AZD converter 204 fluctuates over time due to the influence of thermal noise. Since this is averaged in the correlator 206, the output level of the correlator 206 becomes gentle like a locus 261 shown in the figure.
- FIG. 5 is a graph showing a correspondence relationship between the input level of the zero level detector 207 and the output level of the correlator 208 when a transmission signal of “+” is issued in the transmission apparatus 100.
- FIG. It corresponds to.
- a description will be given with reference to FIG. Note that the correspondence relationship when the transmission device 100 transmits a “one” transmission signal is obtained by reversing the positive and negative of the correspondence relationship shown in FIG.
- the absolute value of the output signal of the correlator 206 is obtained by the absolute value detector 209
- the absolute value of the output signal of the correlator 208 is obtained by the absolute value detector 210
- these are calculated by the comparator 211.
- switch 212 is switched to select the larger signal processing path.
- FIG. 6 is a graph showing the relationship between the output level (absolute value) of the frequency converter 203 and the output level (absolute value) of the switch 212.
- the output of the level of the AZD converter 204 —correlator 206 is greater than the level of the zero level detector 207 —correlator 208.
- the coordinates of the intersection of the portion corresponding to the locus 263 and the portion corresponding to the locus 261 are the diagonal line rising from the bottom of the step-like locus 261 to the first step, and the locus 263 Desirable to be placed at the intersection with the horizon.
- the absolute value of the value output by the correlator 208 when the input to the zero level detector 207 is not near zero is the absolute value of the non-zero output by the AZD 204-correlator 206. It is configured to be smaller than the pair value.
- the transmitter 100 and the receiver 200 have a force that adaptively changes the modulation method according to the radio wave propagation path condition.
- One of the parameters of the radio wave propagation path condition at this time is the received wave in the receiving apparatus 200.
- the left side of the intersection of the portion corresponding to locus 263 and the portion corresponding to locus 261 in FIG. 6 is an area that must be coded with a binary code. It is desirable to adaptively change the modulation method and code method from binary code to multi-value code as power goes up.
- output occurs even below the minimum level of the AZD converter 204, so that communication in a wide service area becomes possible.
- FIG. 7 is an area diagram of a transmission capacity expected from the radio base station in the present embodiment.
- a description will be given with reference to FIG.
- the radio wave intensity is strong, so that the area becomes a high-speed communication area 271.
- the distance from the radio base station 270 increases, there is a medium-speed communication area 272 and a low-speed communication area 273 by the basic receiver 250.
- the high-speed communication area 271 and the medium-speed communication area 272 are left as they are, and the low-speed communication area 274 wider than the low-speed communication area 273 can be used.
- the radio wave intensity can be approximated as being inversely proportional to the cube of the distance. Therefore, the degree of expansion of the low-speed communication area 274 according to this embodiment with respect to the low-speed communication area 273 is at least
- the frequency converter 203 converts the baseband signal into an AZD converter.
- the force and frequency converter 203 shown in the example supplied to each of 204 and zero level detector 207 is only converted to an intermediate frequency, and the intermediate frequency force baseband in the subsequent stage of each of AZD converter 204 and zero level detector 2 07 It is also possible to provide a signal to the correlators 206 and 208 by setting a frequency change ⁇ to the frequency!
- both the AZD converter 204 and the zero level detector 207 remove frequency components close to DC, so the distortion is alleviated and the linearity is improved. Since it becomes necessary to digitize a wide range of analog signals at the output of the detector 207, the dynamic range of the AZD transformation 204 may be reduced. Therefore, any one may be selected as appropriate according to the application.
- FIG. 8 is a schematic diagram showing a schematic configuration of an embodiment in which the present invention is applied to a delay profile measuring apparatus for measuring propagation path delay characteristics of mobile communication using spread spectrum. Less than
- the delay profile measuring device 801 includes a channel sounder 300 and a radio wave state recording device 400, which are associated with the transmitting device 100 and the receiving device 200, respectively.
- Channel sounder 300 removes encoder 101 and correlator 103 from transmitting apparatus 100 and supplies the output of pseudo noise generator 102 to frequency conversion 104 as it is. Therefore, this corresponds to the transmission apparatus 100 that always transmits the sign “+”.
- Radio wave state recording apparatus 400 removes decoder 213 from receiving apparatus 200 and records the output of switch 212 in semiconductor memory 401. Accordingly, the propagation path echoes are sequentially recorded in the semiconductor memory 401. [0108] According to the present embodiment, when the level of the received signal is equal to or lower than the minimum level in the AZD converter 204, the error that the signal level value increases is detected. can do.
- the main application example of the present invention is the power of a mobile communication system using spread spectrum.
- mobile communication systems other than spread spectrum such as a mobile communication system in which multiple access technology is added to OFDM. It can also be applied to the system.
- synchronization acquisition may be performed by detecting the unique word after digital input by AZD conversion. Therefore, communication cannot be performed if synchronization cannot be acquired.
- a receiving apparatus and a receiving method suitable for improving reception sensitivity in spread spectrum communication and the like, a program for realizing these using a computer, and the program It is possible to provide a computer-readable information recording medium on which is recorded.
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- Circuits Of Receivers In General (AREA)
Abstract
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US11/817,625 US7903717B2 (en) | 2005-03-02 | 2005-03-02 | Receiver, receiving method, program and information recording medium |
JP2007505778A JP4374478B2 (ja) | 2005-03-02 | 2005-03-02 | 受信装置、受信方法、プログラム、および、情報記録媒体 |
PCT/JP2005/003534 WO2006092859A1 (ja) | 2005-03-02 | 2005-03-02 | 受信装置、受信方法、プログラム、および、情報記録媒体 |
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PCT/JP2005/003534 WO2006092859A1 (ja) | 2005-03-02 | 2005-03-02 | 受信装置、受信方法、プログラム、および、情報記録媒体 |
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JP2011527748A (ja) * | 2008-07-11 | 2011-11-04 | コミッサリア ア レネルジー アトミーク エ オ ゼネルジ ザルタナテイヴ | 二値観測に基づくシステムのインパルス応答の推定 |
EP2328312B1 (en) * | 2009-11-27 | 2013-03-20 | STMicroelectronics Srl | Method of estimating log-likelihood ratios and relative S-FSK receiver |
Citations (4)
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JPS6429121A (en) * | 1987-07-24 | 1989-01-31 | Nec Corp | Method and apparatus for quantization |
JPH09510841A (ja) * | 1994-03-21 | 1997-10-28 | アールシーエー トムソン ライセンシング コーポレイシヨン | 残留側波帯信号に対するキャリア復元ネットワーク中の位相検出器 |
JP2001251188A (ja) * | 2000-03-08 | 2001-09-14 | Kawasaki Steel Corp | A/dコンバータ及びチョッパ型コンパレータ |
JP2003332973A (ja) * | 2002-05-15 | 2003-11-21 | Hitachi Ltd | 無線通信装置 |
Family Cites Families (5)
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JPS6429121U (ja) | 1987-08-12 | 1989-02-21 | ||
JPH05308344A (ja) | 1992-04-28 | 1993-11-19 | Canon Inc | スペクトラム拡散通信機 |
JPH06164547A (ja) | 1992-11-27 | 1994-06-10 | Uniden Corp | スペクトラム拡散用変調器および受信機 |
JP4355466B2 (ja) | 2002-01-23 | 2009-11-04 | 日本電気株式会社 | 移動通信端末装置及びそれに用いる受信感度劣化防止方法並びにそのプログラム |
WO2004038956A1 (ja) * | 2002-10-28 | 2004-05-06 | Mitsubishi Denki Kabushiki Kaisha | ダイバーシチ受信装置およびダイバーシチ受信方法 |
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2005
- 2005-03-02 US US11/817,625 patent/US7903717B2/en not_active Expired - Fee Related
- 2005-03-02 WO PCT/JP2005/003534 patent/WO2006092859A1/ja not_active Application Discontinuation
- 2005-03-02 JP JP2007505778A patent/JP4374478B2/ja not_active Expired - Fee Related
Patent Citations (4)
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JPS6429121A (en) * | 1987-07-24 | 1989-01-31 | Nec Corp | Method and apparatus for quantization |
JPH09510841A (ja) * | 1994-03-21 | 1997-10-28 | アールシーエー トムソン ライセンシング コーポレイシヨン | 残留側波帯信号に対するキャリア復元ネットワーク中の位相検出器 |
JP2001251188A (ja) * | 2000-03-08 | 2001-09-14 | Kawasaki Steel Corp | A/dコンバータ及びチョッパ型コンパレータ |
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YAMAMURA T. ET AL.: "Kosoku Tekio Hencho Hoshiki o Mochiita OFM Ido Musen Denso System ni Kansuru Ichi Kento", 2000 NEN THE INSTITUE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS SOGO TAIKAI KOEN RONBUNSHU, TSUSHIN 1, vol. B-5-20, 7 March 2000 (2000-03-07), pages 405 * |
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JP4374478B2 (ja) | 2009-12-02 |
US20090010307A1 (en) | 2009-01-08 |
US7903717B2 (en) | 2011-03-08 |
JPWO2006092859A1 (ja) | 2008-08-07 |
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