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PROPAGATION PATH ESTIMATION METHOD

外国特許コード F180009633
整理番号 5289
掲載日 2018年11月20日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2016JP005145
国際公開番号 WO 2017104139
国際出願日 平成28年12月15日(2016.12.15)
国際公開日 平成29年6月22日(2017.6.22)
優先権データ
  • 特願2015-245290 (2015.12.16) JP
発明の名称 (英語) PROPAGATION PATH ESTIMATION METHOD
発明の概要(英語) Provided is a propagation path estimation method in which: the in-phase component and quadrature component of a propagation path estimation value for each pilot sub carrier are divided into an amplitude component and a phase component; the propagation path of a data sub-carrier portion existing between the pilot sub-carriers is estimated by phase-amplitude-separated linear interpolation using the separated amplitude component and phase component, respectively; a reference parameter is generated by performing linear interpolation between the pilot sub-carriers on a complex plane; if the quadrants, on a complex plane, of the interpolated phase component estimation value and the reference parameter are different, phase connection processing is performed to resolve phase discontinuity in respect to the interpolated phase component estimation value due to the phase-amplitude-separated linear interpolation; and if the quadrants are not different, or after phase connection processing has been performed, a complex propagation path estimation value of the data sub-carrier portion is calculated from the phase component and the amplitude component of the propagation path estimation value.
従来技術、競合技術の概要(英語) BACKGROUND ART
Very harsh fading propagation path in the propagation path estimation error with the pilot signal is increased and a problem that the reception quality deteriorates. Wireless communications transmitted in the radio wave reflected by the various propagation environments, scattering, diffraction and received. Through a variety of fading and interference of the radio propagation path received power and the phenomenon of variation is possible, due to the change in the propagation path fluctuates in the case where particularly a high speed or the like and has a severe time-varying.
In addition, a long delay in the propagation environment with a wide band communication is not performed, phase and frequency of the delay amount difference is generated is weakened is strengthened. This is referred to as the frequency selectivity of fading, the delay time of each delayed wave is dependent on the relative power and the intensity difference. Long distance communication is carried out of the delayed wave maximum delay time becomes longer, in particular the frequency selectivity is high.
In such an environment a relatively high efficiency and the communication can be performed in a manner that is known as a modulation scheme OFDM(Orthogonal Frequency Division Multiplex). In this method, orthogonal to each other and not interfere with a plurality of frequency sub-carrier is mounted on the information symbols represented by complex numbers, each of the subcarriers in the time axis signal by adding one OFDM symbol is produced. This operation is typically one OFDM symbol of frequency sub-carriers included in the complex information symbols subjected to inverse Fourier transformation can be realized by performing an operation.
As described above, the influence of fading on the receiver side in order to reach into a digital signal, in order to perform correct demodulation properly influence of this fading propagation path estimation can be performed in each sub-carrier needs to be compensated (equalized). In general each of the sub-carrier bandwidth, sub-carriers in the frequency selectivity of the negligibly small for set, the frequency selectivity between subcarriers by taking into account only the compensation becomes possible.
OFDM is employed in typical communication system or systems such as LTE(Long Term Evolution) WiMAX(Worldwide Interoperability for Microwave Access), both the transmitter and the receiver part of the subcarriers and pilot subcarriers in the known signals, data transmission using the remaining sub-carriers adopted in the method of performing.
In these systems in general and propagation path estimation of the pilot subcarriers, the estimated value of the data subcarriers based on propagation path estimation is carried out, equalization is performed. To perform channel estimation of pilot subcarriers from the estimate of the time, in the prior art method of performing linear interpolation on a complex plane has been used generally. Non-Patent Document 1 is for example, of a general OFDM propagation path estimation method will be described. Non-Patent Document 2 is, in a WiMAX UL channel estimation by linear interpolation of the described method will be explained.
Further, in recent years, from the analog broadcast and digital broadcasting has shifted, a part of the VHF band (hereinafter referred to as 200MHz band) 170MHz-202.5MHz June 2007 by the National Advisory Council for the communication professional is assigned to broadband communication and, when the reference technique has been developed. This technique the reference corresponding to the transmitter as a standard, ARIB STD-T103 developed by has been completed. This is the operation mode of the STD-T103 is two, one of which is known in the WiMAX IEEE 802.16-2009'3' VHF band of the basic parameter Mode1 and is applied to it, the receiver configuration of the mobile communication environment to evaluate the characteristics in the VHF band has been proposed and has heretofore been performed (see Non-Patent Document 3).
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • KYOTO UNIVERSITY
  • 発明者(英語)
  • HARADA, Hiroshi
  • MIZUTANI, Keiichi
  • MAKINO, Kiminobu
国際特許分類(IPC)
指定国 National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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