WO2010137287A1 - Appareil de réception et procédé de réception - Google Patents

Appareil de réception et procédé de réception Download PDF

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Publication number
WO2010137287A1
WO2010137287A1 PCT/JP2010/003475 JP2010003475W WO2010137287A1 WO 2010137287 A1 WO2010137287 A1 WO 2010137287A1 JP 2010003475 W JP2010003475 W JP 2010003475W WO 2010137287 A1 WO2010137287 A1 WO 2010137287A1
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WO
WIPO (PCT)
Prior art keywords
symbol
effective
guard interval
pseudo
unit
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PCT/JP2010/003475
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English (en)
Japanese (ja)
Inventor
王君
竹内章生
鈴木秀和
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パナソニック株式会社
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Filing date
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Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Publication of WO2010137287A1 publication Critical patent/WO2010137287A1/fr

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    • 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]

Definitions

  • the FFT unit 34 performs an FFT process on the effective symbol output from the effective symbol selection unit 33B, converts it into a multicarrier signal sequence as an effective conversion demodulated symbol, and outputs it.
  • Td D / C (seconds) (3)
  • C represents the speed of light, and the value is 3 ⁇ 10 8 (m / sec).
  • the effective symbol selection unit 33B removes the pseudo GI from the symbol interval as a fixed length, selects and outputs an effective symbol from the remaining interval, and performs FFT processing. That is, by setting the interval in which the delay of the reflected wave received by the antenna 11 is maximum as a fixed value of the pseudo GI and removing this fixed value interval, the influence of intersymbol interference due to the reflected wave can be reduced. .
  • FIG. 5 is a block diagram showing a configuration of another example of receiving apparatus 10B according to Embodiment 1 of the present invention.
  • the configuration of the receiving apparatus 10B in another example is that a pseudo guard interval setting unit 41 is further provided in addition to the configuration of the receiving apparatus 10A illustrated in FIG. 1A.
  • the pseudo GI setting unit 41 calculates a fixed value Lp corresponding to the reception distance Dd when the receiving apparatus 10B is installed, and initially sets it as a pseudo GI.
  • the fixed value Lp may be calculated from the equations (3) and (5) as described above.
  • the reception processing unit 12 performs processing such as down-conversion on the single carrier signal received via the antenna 11, takes out an OFDM signal without GI addition, and outputs it as a sampled signal sequence.
  • the symbol selection unit 33 includes a symbol acquisition unit 33A and an effective symbol selection unit 33B.
  • the symbol acquisition unit 33A acquires symbols in a symbol section having a predetermined time width from the sampling signal sequence output from the reception processing unit 12.
  • the effective symbol selection unit 33B removes the pseudo GI length Lp set by the pseudo GI setting unit 41 from the symbol section.
  • the effective symbol selection unit 33B selects and outputs symbols in the remaining section with less delay wave interference as effective symbols.
  • the FFT unit 34 performs an FFT process on the effective symbol output from the effective symbol selection unit 33B based on the pseudo GI set by the pseudo GI setting unit 41, and outputs a multicarrier signal sequence as an effective conversion demodulated symbol.
  • FIG. 7 is a flowchart 51A for explaining the processing flow of the pseudo GI setting unit 51 in the second embodiment of the present invention.
  • the pseudo GI setting unit 51 sets one of a predetermined number of candidate values as a pseudo GI.
  • the pseudo GI setting unit 51 selects the pseudo GI candidate values from the pseudo GI candidate table 52A in the order of decreasing the ratio of the pseudo GI to the symbol section (Lp4 ⁇ Lp3 ⁇ Lp2 ⁇ Lp1). select. That is, the pseudo GI setting unit 51 sets a minimum candidate value as a new pseudo GI among candidate values larger than the previously selected candidate value among a predetermined number of candidate values.
  • the BER calculation unit 36 calculates the BER of the effective conversion demodulated symbol output from the demodulation unit 35. Then, the BER calculation unit 36 outputs the BER to the pseudo GI setting unit 51 (step S15). Thereafter, the pseudo GI setting unit 51 compares and determines the calculated BER with a predetermined BER (step S16).
  • step S16 When the BER is larger than the predetermined BER (“Yes” in step S16), the process returns to step S17 in which the next largest pseudo GI candidate value is set from the pseudo GI candidate table 52. Then, BER is calculated by a series of subsequent steps (step S15), and compared with a predetermined BER (step S16). That is, when the BER calculated by the BER calculation unit 36 is larger than the predetermined BER, the pseudo GI setting unit 51 selects a candidate value different from the previously selected candidate value from the predetermined number of candidate values as a new pseudo GI. Then, the effective symbol selection unit 33B selects an effective symbol based on the new pseudo GI.
  • the predetermined BER may be set to a BER that allows the received data to be considered substantially error-free.
  • the pseudo GI is not initially set as a fixed length as in the first embodiment, but the pseudo GI is appropriately set so that the BER becomes equal to or lower than a predetermined BER in accordance with a change in the reception environment. Dynamically selected. Therefore, by selecting an optimum value from a plurality of pseudo GI candidate values, it is possible to dynamically cope with changes in the reception environment.
  • FIG. 8 is a block diagram showing a configuration of another example of receiving apparatus 10D according to Embodiment 2 of the present invention.
  • the receiving apparatus 10D of FIG. 8 is different from the receiving apparatus 10C of FIG. 6A in that it further includes a selection instruction unit 53.
  • the symbol selection unit 33 is a reception processing unit Symbols in a symbol section having a predetermined time width are acquired from the sampled signal sequence output by 12. Then, the symbol selection unit 33 removes the pseudo GI selected by the pseudo GI setting unit 51 from the symbol interval, selects the symbols in the remaining interval with little delay wave interference as effective symbols, and outputs them.
  • the FFT unit 34 performs FFT processing on the effective symbols output from the symbol selection unit 33 and outputs the result as a multicarrier signal sequence.
  • FIG. 9 is a block diagram showing a configuration of receiving apparatus 10E according to Embodiment 3 of the present invention.
  • the receiving device 10E in the present embodiment includes a switching unit 37 and an effective pseudo guard interval storage unit (hereinafter abbreviated as “effective pseudo GI storage unit”) 38, compared to the receiving device 10C illustrated in FIG. 6A. Furthermore, it is different. 9, blocks having the same functions and operations as those in FIG. 6A are denoted by the same reference numerals, and detailed description thereof is omitted.
  • the switching unit 37 has a function of enabling or disabling the BER calculation unit 36 at a predetermined timing. That is, whether or not to output the BER output from the BER calculation unit 36 to the pseudo GI setting unit 51 is controlled at a predetermined timing.
  • the predetermined timing may be any of the following timings (a) to (e).
  • the pseudo GI used by the symbol selection unit 33B to select an effective symbol is stored as an effective pseudo GI.
  • the effective pseudo GI used last time by the pseudo GI setting unit 51a
  • Different candidate values are selected from a predetermined number of candidate values and stored in the effective pseudo GI storage unit 38 as new effective pseudo GIs. Note that the predetermined number of candidate values are included in the pseudo GI candidate table unit 52 as described above.
  • the receiving apparatus 10E can dynamically select an optimal pseudo GI as necessary. Further, since the effective pseudo GI storage unit 38 stores the current effective pseudo GI, it is possible to quickly select an effective pseudo GI candidate value that can further improve the BER. Therefore, it is possible to provide a receiving apparatus that can remove intersymbol interference caused by reflected wave delay with a simple configuration and can receive a good digital signal.
  • FIG. 10 is a flowchart for explaining the processing flow of receiving apparatus 10E according to Embodiment 3 of the present invention.
  • the processing flow of the receiving device 10E in the present embodiment is compared with the processing flow of the receiving device 10A shown in FIG. 4 from the determination step (step S20) subsequent to the BER calculation step (step S15) to the pseudo GI setting step ( The steps up to step S17a) are different.
  • the same steps as those in the processing flow of the receiving apparatus 10C illustrated in FIG. 7 are denoted by the same reference numerals, and detailed description thereof is omitted. In the following, the steps different from these will be mainly described.
  • the BER calculation unit 36 calculates the BER of the effective conversion demodulated symbol output from the demodulation unit 35 (step S15).
  • the switching step switches whether to enable or disable the BER output in the BER rate calculating step at a predetermined timing (step S20). That is, when the BER is invalidated (“No” in step S20), the series of processes is terminated.
  • step S17b the process proceeds to a valid pseudo GI storage step (step S17b).
  • the pseudo GI used to select an effective symbol in the effective symbol selection step is stored in the effective pseudo GI storage unit 38 as an effective pseudo GI. That is, when the BER output in the BER calculation step is validated by the switching step (“Yes” in step S20), and the BER calculated in the BER calculation step is larger than the predetermined BER, A candidate value different from the effective pseudo GI used last time in the GI setting step is selected from a predetermined number of candidate values and stored in the effective pseudo GI storage unit 38 as a new effective pseudo GI.
  • a new effective pseudo GI is set (step S17a).
  • the reception method according to the present embodiment can dynamically select the optimum pseudo GI as necessary. Further, since the effective pseudo GI storage unit 38 stores the current effective pseudo GI, it is possible to quickly select an effective pseudo GI candidate value that can further improve the BER. Therefore, it is possible to provide a reception method capable of eliminating the intersymbol interference caused by the reflected wave delay with a simple configuration and receiving a good digital signal.
  • the present invention can be applied to reception demodulation in a digital signal receiving system, particularly a digital signal receiving system transmitted without adding a GI.

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

Abstract

Lorsqu'un appareil de réception reçoit un signal numérique auquel aucun intervalle de protection n'a été ajouté, l'appareil de réception décide d'un intervalle de pseudo-protection sur la base du temps de retard de transport maximal entre les côtés d'émission et de réception de signal numérique, puis sélectionne, en tant que symboles efficaces, les symboles de sections obtenus par retrait des intervalles de pseudo-protection à partir du signal reçu.
PCT/JP2010/003475 2009-05-26 2010-05-25 Appareil de réception et procédé de réception WO2010137287A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009-126070 2009-05-26
JP2009126070 2009-05-26

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WO2010137287A1 true WO2010137287A1 (fr) 2010-12-02

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0897798A (ja) * 1994-09-26 1996-04-12 Nippon Columbia Co Ltd Ｏｆｄｍ変調器及びｏｆｄｍ復調器
WO2006095874A1 (fr) * 2005-03-10 2006-09-14 Matsushita Electric Industrial Co., Ltd. Appareil radio emetteur et appareil radio recepteur

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0897798A (ja) * 1994-09-26 1996-04-12 Nippon Columbia Co Ltd Ｏｆｄｍ変調器及びｏｆｄｍ復調器
WO2006095874A1 (fr) * 2005-03-10 2006-09-14 Matsushita Electric Industrial Co., Ltd. Appareil radio emetteur et appareil radio recepteur

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TATSUYA FUKUI ET AL.: "OFDM ISI Suppression Scheme employing Transmission Mode Selection based on Instantaneous BER Estimation", THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS SOGO TAIKAI KOEN RONBUNSHU, 05 MARCH 2008 (05.03.2008), 2008 NEN TSUSHIN(1), 5 March 2008 (2008-03-05), pages 450 *

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