WO2008065901A1 - Système de communication radio, dispositif de communication radio, et procédé de communication radio - Google Patents

Système de communication radio, dispositif de communication radio, et procédé de communication radio Download PDF

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Publication number
WO2008065901A1
WO2008065901A1 PCT/JP2007/072202 JP2007072202W WO2008065901A1 WO 2008065901 A1 WO2008065901 A1 WO 2008065901A1 JP 2007072202 W JP2007072202 W JP 2007072202W WO 2008065901 A1 WO2008065901 A1 WO 2008065901A1
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WO
WIPO (PCT)
Prior art keywords
unit
environment
distance
communication environment
window function
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PCT/JP2007/072202
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English (en)
Japanese (ja)
Inventor
Takeshi Nakano
Mitsuharu Senda
Original Assignee
Kyocera Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from JP2006321533A external-priority patent/JP2008136055A/ja
Priority claimed from JP2007018098A external-priority patent/JP2008141715A/ja
Application filed by Kyocera Corporation filed Critical Kyocera Corporation
Publication of WO2008065901A1 publication Critical patent/WO2008065901A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • 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
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • 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
    • H04L27/2655—Synchronisation arrangements

Definitions

  • Wireless communication system Wireless communication apparatus, and wireless communication method
  • the present invention relates to a wireless communication system, a wireless communication apparatus, and a wireless communication method.
  • a wireless communication system that performs packet communication by adopting TOFDMA (Orthogonal Frequency Division Multiple Access) in addition to TDMA (Time Division Multiple Access) / TDD (Time Division Duplex) as a multiple access technology suspension is the next generation. It is attracting attention as a broadband mobile communication system.
  • OFDMA Orthogonal subcarriers are shared by a plurality of terminals, and a plurality of arbitrary subcarriers are positioned as subchannels.
  • multiple access is realized by adaptively allocating subchannels to each terminal at any communication timing (in a system employing TDMA, this communication timing is equivalent to a slot).
  • FIG. 10A is a schematic diagram of an OFDM signal.
  • each symbol is composed of a GI (Guard Interval) portion and a data portion, and discontinuities occur between the symbols.
  • this data is referred to as window function target data
  • This window function target data must be data that has continuity at discontinuities.
  • the discontinuity seen from symbol 1 is the data Part 2 is the second half of Dl. In the latter half, the original data of the GI part gl exists. Therefore, as shown in FIG.
  • the window function target data having continuity at the discontinuity point as seen from symbol 1 is data immediately after the GI part gl, that is, data at the head part of the data part D1.
  • Data at the beginning of this data part D1 is extracted as the window function target data dl of symbol 1.
  • a predetermined window function is applied to the window function target data dl and added to the end of the data part D1.
  • the window function target data dl after the window function is applied is the extended data dl '.
  • the discontinuity point seen from symbol 2 corresponds to the head part of GI part g2, and the window function target data having continuity with respect to this head part is shown in data part D2 as shown in FIG. 10C.
  • This is the data immediately before the original data of GI part g2.
  • This data is extracted as the window function target data d2 of symbol 2, applied with a predetermined window function, and added to the head of the GI part g2.
  • the window function target data d2 after the window function is applied is defined as extended data d2 ′. The above processing is performed for each symbol.
  • FIG. 11A shows the case where symbol 1 and symbol 2 described above are arranged in series according to the method defined in the IEEE802.11g standard. In this method, the extension data dl ′ of symbol 1 overlaps with the GI part g2 of symbol 2, and the extension data d2 ′ of symbol 2 overlaps with the data part D1 of symbol 1.
  • FIG. 11B shows a case where the above-described symbol 1 and symbol 2 are arranged in series by the method defined in the IEEE802.20 standard. In this method, the extension data d1 'of symbol 1 and the extension data d2' of symbol 2 overlap. The extension data does not overlap the data part D1 or GI part g2.
  • the discontinuity at the discontinuity point is alleviated, and the side lobe in the band can be reduced.
  • Symbol 2 expansion data d2 ' Has a problem that the SNR (Signal to Noise Ratio) decreases.
  • the SNR does not decrease, but the symbol time increases, so the data rate increases. There was a problem of lowering.
  • the guard interval period is set longer with a margin, the symbol length becomes longer even after synchronization is established between the base station and the wireless communication terminal, and the data rate cannot be improved. .
  • Patent Document 1 Japanese Translation of Special Publication 2003-535502
  • the present invention has been made in view of the above-described circumstances, and an object of the present invention is to reduce side lobes in a band without reducing the SNR and data rate when performing communication using OFDM. To do.
  • the present invention has the following aspects, for example.
  • a first aspect is a wireless communication system that performs communication using OFDM (Orthogonal Frequency Division Multiplexing), and grasps the communication environment with the receiving side after establishing synchronization with the receiving side.
  • a reduction area determination unit that determines a reduction area in the guard interval according to the unit and the communication environment, and for each symbol, a predetermined window function is applied to the reduction area of the guard interval and a guard interval is applied.
  • a window function processing unit that adds extended data obtained by applying a predetermined window function to data extracted from a part of the immediately following data area, and a symbol processed by the window function processing unit.
  • a symbol placement unit that places each other in series so that the beginning of the symbol does not overlap the data area of an adjacent symbol. It is obtain a wireless communication system.
  • a second aspect is the above-described wireless communication system, further comprising a storage unit that stores in advance a correspondence between a distance between a transmission side and a reception side and the reducible region, and The communication environment grasping unit grasps the distance between the transmission side and the receiving side as the communication environment, and the reducible area determination unit comprises the distance grasped by the communication environment grasping unit, the storage unit The wireless communication system determines a reducible area corresponding to the distance based on the correspondence relationship stored in! /.
  • a third aspect is the wireless communication system described above, wherein the storage unit stores the correspondence relationship according to a line-of-sight environment with respect to the receiving side, and the communication environment grasping unit is configured as the communication environment.
  • the distance between the transmitting side and the receiving side and the line-of-sight environment are grasped, and the reducible area determination unit is stored in the storage unit and the distance and line-of-sight environment grasped by the communication environment grasping unit.
  • the wireless communication system determines a reducible area corresponding to the distance and the line-of-sight environment based on the correspondence relationship according to the line-of-sight environment.
  • a fourth aspect is a wireless communication apparatus that performs communication using OFDM, and after establishing synchronization with the receiving side, a communication environment grasping unit that grasps a communication environment with the receiving side, and the communication
  • a wireless communication device comprising: a reducible area determination unit that determines a reducible area in a guard interval according to a communication environment.
  • a fifth aspect is the above-described wireless communication apparatus, in which for each symbol, a predetermined window function is applied to the area where the guard interval can be reduced and extracted from a part of the data area immediately after the guard interval.
  • a window function processing unit for adding extended data obtained by applying a predetermined window function to the processed data at the end of the data area, and symbols processed by the window function processing unit are Is a radio communication apparatus further comprising a symbol arrangement unit arranged in series so as not to overlap the data area of adjacent symbols.
  • a sixth aspect is the wireless communication apparatus, further comprising a storage unit that stores in advance a correspondence relationship between a distance between the own apparatus and the receiving side and the reducible area,
  • the environment grasping unit grasps the distance between the own device and the receiving side as the communication environment, and the reducible area determining unit grasps the distance grasped by the communication environment grasping unit and the memory
  • the wireless communication apparatus determines a reducible area corresponding to the distance based on the correspondence relationship stored in the unit.
  • a seventh aspect is the wireless communication apparatus, wherein the storage unit stores the correspondence relationship according to a line-of-sight environment with respect to the receiving side, and the communication environment grasping unit includes the communication As the environment, the distance between the own device and the receiving side and the visibility environment are grasped, and the reducible area determination unit is grasped by the communication environment grasping unit. Based on the distance and line-of-sight environment and the correspondence relationship stored in the storage unit according to the line-of-sight environment! /, The reduction possible area corresponding to the distance and line-of-sight environment is determined. , A wireless communication device.
  • An eighth aspect is a wireless communication method that performs communication using OFDM, and grasps a communication environment between the transmission side and the reception side after establishing synchronization between the transmission side and the reception side
  • a wireless communication method comprising: a communication environment grasping step; and a reducible area determining step for determining a reducible area in a guard interval according to the communication environment.
  • a ninth aspect is the above wireless communication method, further comprising a storage step of previously storing a correspondence relationship between a distance between a transmission side and a reception side and the reduction possible region,
  • the boundary grasping step grasps the distance between the transmission side and the receiving side as the communication environment, and the reducible area determination step comprises the distance grasped in the communication environment grasping step, and the storage step
  • the wireless communication method determines a reducible area corresponding to the distance based on the correspondence relationship stored in! /.
  • a tenth aspect is the wireless communication method, wherein the storing step stores the correspondence relationship according to a line-of-sight environment between the transmission side and the reception side, and determines the communication environment.
  • the distance between the transmitting side and the receiving side and the line-of-sight environment are grasped as the communication environment, and the reducible area determination step is performed in the communication environment grasping step!
  • a wireless communication method for determining a reducible area corresponding to the distance and line-of-sight environment based on the grasped distance and line-of-sight environment and the correspondence relationship corresponding to the line-of-sight environment stored in the storing step. is there.
  • An eleventh aspect is the wireless communication method described above, in which a predetermined window function is applied to the area where the guard interval can be reduced for each symbol, and extracted from a part of the data area immediately after the guard interval.
  • the leading power of the symbol is a wireless communication method that is arranged in series so as not to overlap the data area of the adjacent symbol.
  • FIG. 1 is a schematic configuration diagram of a wireless communication system in an embodiment of the present invention.
  • FIG. 2 is a schematic diagram showing a relationship among frequencies, slots, and subchannels of a wireless communication system in an embodiment of the present invention.
  • FIG. 3 is a configuration block diagram of a wireless communication terminal (terminal) PS in an embodiment of the present invention.
  • FIG. 4A is a first explanatory diagram showing a correspondence relationship between a Gr reduction possible area and a distance between a terminal PS and a base station CS in an embodiment of the present invention.
  • FIG. 4B is a first explanatory diagram showing a correspondence relationship between a Gr reduction possible area and a distance between the terminal PS and the base station CS in an embodiment of the present invention.
  • FIG. 5A is a second explanatory diagram showing a correspondence relationship between the Gr reduction possible area and the distance between the terminal PS and the base station CS in one embodiment of the present invention.
  • FIG. 5B is a second explanatory diagram showing a correspondence relationship between the Gr reduction possible area and the distance between the terminal PS and the base station CS in one embodiment of the present invention.
  • FIG. 6 is a detailed explanatory diagram of the wireless communication unit 2 in one embodiment of the present invention.
  • FIG. 7 is an operation flow chart of a wireless communication terminal (terminal) PS according to an embodiment of the present invention.
  • FIG. 8 is a first explanatory diagram showing an ECP process in one embodiment of the present invention.
  • FIG. 9 is a second explanatory diagram showing an ECP process in one embodiment of the present invention.
  • FIG. 1 OA is an explanatory diagram showing a conventional ECP process.
  • FIG. 10B is an explanatory view showing a conventional ECP process.
  • FIG. 10B is an explanatory view showing a conventional ECP process.
  • FIG. 11A is an explanatory view showing conventional ECP processing.
  • FIG. 11B is an explanatory diagram showing a conventional ECP process.
  • the wireless communication system of this embodiment includes a base station CS, a wireless communication terminal (hereinafter abbreviated as a terminal) PS, and a network (not shown).
  • Base station CS and terminal PS are time-division multiplex connections Communication is performed using orthogonal frequency division multiple access (OFDMA) as a multiple access technique in addition to system (TDMA) and time division duplex (TDD).
  • OFDMA orthogonal frequency division multiple access
  • TDMA system
  • TDD time division duplex
  • a plurality of base stations CS are provided at regular distance intervals, and multiple connections are made with a plurality of terminals PS to perform wireless communication.
  • the terminal PS and the base station CS have the same configuration in the present embodiment in the force characteristic portion corresponding to the wireless communication device. For this reason, the following explanation will be given using the terminal PS as a representative.
  • the OFDMA scheme is that all subcarriers in an orthogonal relationship are shared by all terminal PSs, and a set of arbitrary subcarriers is positioned as one group, one for each terminal PS.
  • the TDMA method and the TDD method are further combined with the OFDMA method described above.
  • each group is divided into an uplink and a downlink in the time axis direction as a TDD, and these uplink and downlink are each divided into four TDMA slots.
  • FIG. 2 shows the relationship among frequency, TDMA slot, and subchannel in the wireless communication system of this embodiment.
  • the vertical axis represents frequency and the horizontal axis represents time.
  • 112 subchannels which are multiplied by 28 in the frequency direction and 4 in the time axis direction (4 slots), are allocated for uplink and downlink, respectively.
  • the most subchannel in the frequency direction (number 1 in FIG. 2) is used as a control channel (CCH) among all subchannels.
  • the remaining subchannel is used as a traffic channel (TCH).
  • this traffic channel is called a traffic subchannel.
  • the base station CS and the terminal PS that perform radio communication can be arbitrarily selected from all traffic subchannels belonging to the uplink and downlink (in this case, 108 subchannels of 27 X 4 slots excluding CCH).
  • One or more traffic subchannels are assigned.
  • the same traffic channel is assigned to the traffic subchannel for uplink and downlink as communication channels.
  • the terminal PS controls the terminal A unit 1, a wireless communication unit 2, an operation unit 3, a display unit 4, a voice input / output unit 5 and a storage unit (storage means) 6 are provided. Further, the terminal control unit 1 includes a communication environment grasping unit (communication environment grasping unit) la and a GI reducible region determining unit (reducible region determining unit) lb as functional elements.
  • a communication environment grasping unit communication environment grasping unit
  • a GI reducible region determining unit resistible region determining unit
  • the terminal control unit 1 Control the overall operation.
  • the communication environment grasping unit la of the terminal control unit 1 is based on the received signal acquired from the base station CS via the wireless communication unit 2! /, Based on the distance between the terminal PS and the base station CS and the line-of-sight environment. To figure out. Specifically, the communication environment grasping unit la grasps whether the prospect environment is an environment that is within the prospect or an environment that is not the prospect.
  • the communication environment grasping unit la grasps the distance between the terminal PS and the base station CS based on the synchronization timing.
  • the base station CS uses the power of the response frame from the terminal PS to the frame sent to the synchronized terminal PS that is the other party of communication (how long the deviation time is based on the time axis). calculate.
  • the base station CS instructs the terminal PS in advance to transmit at a timing that allows for the time difference.
  • the line-of-sight environment is an environment in which there are few occurrences of multipaths between the terminal PS and the base station CS in the communication area.
  • the Gr reduction possible area becomes smaller in inverse proportion to the distance between the terminal PS and the base station CS. This is because the delay time increases as the terminal PS is located at a longer distance from the base station CS.
  • the unforeseen environment is an environment where multiple paths occur frequently because there are obstacles between the terminal PS and the base station CS in the communication area, as shown in Fig. 5A.
  • the delayed wave power may be larger than in the out-of-sight environment, and as shown in FIG. 5B, an exponential function is used for the distance between the terminal PS and the base station CS. Therefore, the area where Gr can be reduced becomes smaller.
  • whether or not the force is a line-of-sight environment and an environment that is not a line-of-sight environment is determined as follows. If the received signal level of the delayed wave arriving after the direct wave arriving at the base station CS from the terminal PS is lower than that of the direct wave, the line-of-sight environment is determined. In addition, it is judged that the environment is out of sight when there are delay waves with more delay waves than a certain number and a signal level higher than that of the direct waves.
  • Gr reduction information the correspondence between the distance between the terminal PS and the base station CS in the sight-line environment and the non-line-of-sight environment and the Gr reduction possible area.
  • Gr reduction information may be stored as table-like data or as a function.
  • the Gr reducible area determination unit lb includes the distance between the terminal PS and the base station CS, which is grasped by the communication environment grasping unit la, the line-of-sight environment, and the Gr reduction information stored in the storage unit 6. Based on the above, the Gr reduction possible area corresponding to the distance between the terminal PS and the base station CS and the line-of-sight environment is determined.
  • the terminal control unit 1 outputs the Gr reducible region determined by the Gr reducible region determining unit lb and the ECP processing start request to the ECP processing unit 16 described later.
  • the radio communication unit 2 Under the control of the terminal control unit 1, the radio communication unit 2 performs error correction coding, modulation, and multiplexing by OFDM on the control signal or data signal output from the terminal control unit 1 to multiplex Get the digitized signal (OFDM signal). Further, the radio communication unit 2 frequency-converts the multiplexed signal into the RF frequency band, and transmits it to the base station CS as a transmission signal.
  • the transmitter side of the wireless communication unit 2 includes an error correction coding unit 10, an interleaver 11, a serial / parallel conversion unit 12, a digital modulation unit 13, an IF FT (Inverse Fast Fourier Transform) unit 14, GI (Guard Interval) attached calorie unit 15, ECP (Ext ended Cyclic Prefix) processing unit 16, and transmission unit 17.
  • error correction coding unit 10 an interleaver 11
  • serial / parallel conversion unit 12 a digital modulation unit 13
  • GI Guard Interval
  • ECP Ext ended Cyclic Prefix
  • the error correction encoding unit 10 is, for example, a FEC (Forward Error Correction) encoder.
  • the error correction coding unit 10 adds an error correction code, which is redundant information, to the bit string of the control signal or data signal input from the terminal control unit 1 based on the coding rate specified by the terminal control unit 1. , Output to interleaver 11.
  • the interleaver 11 performs an interleaving process on the bit string to which the error correction code is added by the error correction coding unit 10.
  • the serial / parallel conversion unit 12 converts the bit string after the interleaving process into the terminal control unit.
  • Each subcarrier included in the subchannel indicated in 1 is divided in bit units and output to each digital modulation section 13.
  • the digital modulation unit 13 digitally modulates the bit data divided for each subcarrier using the subcarrier corresponding to the bit data, and outputs the modulated signal to the IFFT unit 14.
  • Each digital modulation unit 13 is a modulation method instructed by the terminal control unit 1, for example, BPSK (Binary Phase Shift Keying), QPSK (Quadrature Phase Shift Keying), 16Q AM (Quadrature Amplitude Modulation), Digital modulation is performed using 64QAM.
  • the IFFT unit 14 generates an OFDM signal by performing inverse Fourier transform on the modulated signal input from each digital modulation unit 13 and performing orthogonal multiplexing, and outputs the OFDM signal to the GI adding unit 15.
  • the GI adding unit 15 adds a guard interval (GI) to the OFDM signal input from the IFFT unit 14 and outputs it to the ECP processing unit 16.
  • GI guard interval
  • the ECP processing unit 16 includes a window function processing unit 16a and a symbol arrangement unit 16b.
  • the ECP processing unit 16 starts the ECP processing in response to an ECP processing start request input from the terminal control unit 1.
  • the ECP processing unit 16 outputs the OFDM signal after GI addition to the transmitting unit 17 without processing.
  • the window function processing unit 16a Based on the Gr reducible region input from the terminal control unit 1, the window function processing unit 16a applies a predetermined window function to the Gr reducible region for each symbol included in the OFDM signal after GI addition.
  • the window function processing unit 16a adds the extended data obtained by applying a predetermined window function to the window function target data extracted from the head part of the data part immediately after the GI, at the end of the data part.
  • the symbol arrangement unit 16b arranges the symbols processed by the window function processing unit 16a in series so as not to overlap the symbol leading force s and the data portion of the adjacent symbol, and outputs them to the transmission unit 17.
  • the transmission unit 17 converts the frequency of the OFDM signal input from the symbol arrangement unit 16b into an RF frequency band, and transmits it to the base station CS as a transmission signal.
  • the receiver side of the wireless communication unit 2 includes components that perform the reverse operation of the transmitter side. That is, the receiver side of the radio communication unit 2 extracts the received OFDM signal by frequency-converting the received signal received from the base station CS to the IF frequency band. Further, the receiver side of the wireless communication unit 2 applies the window function to the received OFDM signal and the GI. Remove. After that, the receiver side of the wireless communication unit 2 reconstructs the bit string by performing FFT processing, digital demodulation, parallel serial conversion processing, dintariba processing, and error correction decoding processing on the received OFDM signal. Output to control unit 1.
  • the operation unit 3 is composed of operation keys such as a power key, various function keys, and a keypad.
  • the operation unit 3 outputs an operation signal based on operation inputs from these operation keys to the terminal control unit 1.
  • the display unit 4 is, for example, a liquid crystal monitor or an organic EL monitor, and displays predetermined images and characters based on display signals input from the terminal control unit 1.
  • the voice input / output unit 5 includes a microphone and a speaker.
  • the voice input / output unit 5 converts voice input from the outside through the microphone into a digital signal and outputs the digital signal to the terminal control unit 1.
  • the audio input / output unit 5 outputs the audio data input from the terminal control unit 1 to the outside through a speaker.
  • the storage unit 6 stores various data such as a terminal control program and GI reduction information used by the terminal control unit 1 and has a function as a buffer used for retransmission control and the like.
  • terminal PS configured as described above will be described using the flowchart of FIG.
  • terminal control unit 1 receives an operation signal instructing data transmission from operation unit 3.
  • the terminal control unit 1 controls the radio communication unit 2 to search for a control channel (CCH) transmitted from the base station CS.
  • the terminal control unit 1 performs a process of establishing a communication connection with the base station CS that has successfully acquired and transmitted the control channel with the best reception state.
  • the terminal control unit 1 requests the base station CS to allocate a link channel (traffic subchannel) via the control channel, and the base station CS and the base station CS are based on the synchronization information included in the control channel.
  • Establish synchronization step Sl).
  • the communication environment grasping unit la establishes a communication between the terminal PS and the base station CS based on the received signal acquired from the base station CS via the wireless communication unit 2.
  • the distance and the prospect environment are ascertained (step S2).
  • the communication environment grasping unit la synchronizes the distance between the terminal PS and the base station CS. Get based on ming. Then, the communication environment grasping unit la determines that it is a line-of-sight environment when the received signal level of the delayed wave that arrives after the direct wave that reaches the base station CS from the terminal PS is lower than the direct wave. In addition, the communication environment grasping unit la determines that the environment is an out-of-look environment when there are delay waves that have more than a predetermined number of delay waves and a signal level higher than that of the direct waves.
  • the Gr reducible area determination unit lb determines the distance between the terminal PS and the base station CS, which is grasped by the communication environment grasping unit la, the line-of-sight environment, and the Gr stored in the storage unit 6. Based on the reduction information, the Gr reduction possible area corresponding to the distance between the terminal PS and the base station CS and the line-of-sight environment is determined (step S3). Specifically, for example, when the outlook environment grasped by the communication environment grasping unit la is an unforeseen environment, the Gr reducible area determination unit lb displays the Gr reducible area shown in FIG. The Gr reduction possible area is determined based on the correspondence with the distance to the station CS.
  • terminal control section 1 outputs a bit string of a data signal to be transmitted to base station CS to error correction coding section 10. Further, the terminal control unit 1 outputs an ECP processing start request and a signal indicating the Gr reducible region determined by the Gr reducible region determining unit lb to the ECP processing unit 16.
  • the bit string of the data signal is converted into an OFDM signal to which GI is added through an error correction coding unit 10, an interleaver 11, a serial-parallel conversion unit 12, a digital modulation unit 13, an IFFT unit 14, and a GI addition unit 15.
  • the OFD M signal is input to the window function processing unit 16a of the ECP processing unit 16.
  • an ECP process start request and a signal indicating a Gr reduction possible area are input from the terminal control unit 1 to the window function processing unit 16a. Therefore, the window function processing unit 16a starts ECP processing on the OFDM signal input from the GI adding unit 15 (step S4).
  • the OFDM signal input from the GI adding unit 15 can be shown in FIG. Fig. 8 shows symbol 1 extracted from the OFDM signal shown in Fig. 10A.
  • the window function processing unit 16a applies a predetermined window function (for example, a trigonometric function) to the Gr reducible region rl in the GI unit gl of the symbol 1.
  • the window function processing unit 16a starts from the head of the data part D1 immediately after the GI part gl.
  • the extended data r2 ′ obtained by applying a predetermined window function to the extracted window function target data r2 is added to the end of the data part D1.
  • data rl ′ obtained by applying a window function to the Gr reducible area rl is added to the beginning of symbol 1.
  • the extension data r2 ′ is added to the end of the symbol 1. Then, as shown in FIG. 9, the same process is performed for symbol 2.
  • the symbol arrangement unit 16b serially processes the symbols processed by the window function processing unit 16a so that the head of the symbol does not overlap the data portion of the adjacent symbol. Deploy. Specifically, the symbol arrangement unit 16b arranges the symbols processed by the window function processing unit 16a in series so that only the extension data r2 ′ and the data rl ′′ overlap, and outputs the symbols to the transmission unit 17.
  • the transmission unit 17 inputs the OFDM signal from the symbol arrangement unit 16b, and the transmission unit 17 frequency-converts the OFDM signal to an RF frequency band to obtain a transmission signal, which is transmitted to the base station CS (step S5).
  • adjacent symbols are arranged in series by a method similar to the conventional IEEE802.20 standard shown in Fig. 11B, where the difference between this embodiment and the conventional one is that Gr can be reduced in the GI section.
  • the GI length is shortened, which reduces the symbol time and suppresses the decrease in data rate, that is, while suppressing the decrease in data rate just by reducing the SNR. It is possible to reduce the side lobes of the band.
  • the guard interval time corresponding to the reducible amount can be reduced, and the symbol length of the communication frame can be shortened, thereby improving the data rate in communication. be able to.
  • the present invention can be widely applied to communication systems using OFDM systems that use only DMA.
  • the terminal PS has been described as an example of the wireless communication apparatus, the present invention is not limited to this, and the same configuration can be applied to a wireless communication apparatus that performs communication using the base station CS or other OFDM. Monkey.

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Abstract

L'invention concerne un système de communication r adio, un dispositif de communication radio et un procédé de communication radio. Il est possible de fournir un système de communication radio capable de réduire un lobe latéral à l'intérieur d'une bande sans abaisser un rapport signal sur bruit (SNR) et un débit de données lors de la réalisation d'une communication par l'utilisation du multiplexage par répartition orthogonale de la fréquence (OFDM). Le système de communication comprend : des moyens (1a) de reconnaissance d'environnement de communication qui reconnaissent un environnement de communication avec un côté de réception après établissement d'une synchronisation avec le côté de réception ; des moyens (1b) de décision de région activée par réduction qui décident d'une région activée par réduction dans un intervalle de garde conformément à l'environnement de communication ; des moyens (16a) de traitement de fonction de fenêtre qui appliquent une fonction de fenêtre prédéterminée à la région activée par réduction de l'intervalle de garde pour chaque symbole et ajoutent des données d'extension obtenues par application de la fonction de fenêtre prédéterminée aux données extraites à partir d'une partie de la région de données immédiatement après l'intervalle de garde, à l'extrémité d'une région de données ; et des moyens (16b) d'agencement de symbole qui agencent les symbole traités par les moyens de traitement de fonction de fenêtre en série de telle sorte que les têtes de symbole ne sont pas superposées sur la région de données de symbole adjacente.
PCT/JP2007/072202 2006-11-29 2007-11-15 Système de communication radio, dispositif de communication radio, et procédé de communication radio WO2008065901A1 (fr)

Applications Claiming Priority (4)

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JP2006-321533 2006-11-29
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CN101729482B (zh) * 2008-10-29 2013-03-27 京瓷株式会社 基站装置和基站控制方法
US9680681B2 (en) 2013-03-04 2017-06-13 Mitsubishi Electric Corporation Transmission apparatus, reception apparatus, and communication system

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JP2000068975A (ja) * 1998-02-22 2000-03-03 Sony Internatl Europ Gmbh 送信方法及び送信装置、並びに受信方法及び受信装置
JP2003298549A (ja) * 2002-04-02 2003-10-17 Mitsubishi Electric Corp マルチキャリア送信装置
JP2004135305A (ja) * 2002-10-08 2004-04-30 Lucent Technol Inc Ｏｆｍｄａを使用するｈｓｄｐａシステムのためのフィードバック方法

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JP2000068975A (ja) * 1998-02-22 2000-03-03 Sony Internatl Europ Gmbh 送信方法及び送信装置、並びに受信方法及び受信装置
JP2003298549A (ja) * 2002-04-02 2003-10-17 Mitsubishi Electric Corp マルチキャリア送信装置
JP2004135305A (ja) * 2002-10-08 2004-04-30 Lucent Technol Inc Ｏｆｍｄａを使用するｈｓｄｐａシステムのためのフィードバック方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101729482B (zh) * 2008-10-29 2013-03-27 京瓷株式会社 基站装置和基站控制方法
US9680681B2 (en) 2013-03-04 2017-06-13 Mitsubishi Electric Corporation Transmission apparatus, reception apparatus, and communication system
US9866419B2 (en) 2013-03-04 2018-01-09 Mitsubishi Electric Corporation Transmission apparatus, reception apparatus, and communication system

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