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TRANSMITTER, TRANSMISSION METHOD, AND RECEIVER UPDATE

外国特許コード F180009631
整理番号 5316
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 2016JP005257
国際公開番号 WO 2017119050
国際出願日 平成28年12月28日(2016.12.28)
国際公開日 平成29年7月13日(2017.7.13)
優先権データ
  • 特願2016-002695 (2016.1.8) JP
発明の名称 (英語) TRANSMITTER, TRANSMISSION METHOD, AND RECEIVER UPDATE
発明の概要(英語) A transmitter in which: channel aggregation is adopted for bundling and transferring usable channels present in a variety of frequency bands; and OFDM, OFDMA, or a similar method is adopted as a modulation scheme, wherein one or more transmission units are provided in parallel to the latter stage of a subcarrier mapping circuit, the transmission units being provided in corresponding fashion to one or more frequency bands, and one or more transmission processing units are provided in parallel to each of the transmission units, the transmission processing units being provided in corresponding fashion to one or a plurality of channels. The transmission processing units each have a high-speed inverse Fourier transform circuit or a discrete inverse Fourier transform circuit, a GI and overlap margin (OM) adding circuit, and a time-axis windowing processing unit. The time-axis windowing processing unit multiplies a desired time-axis window function according to the spectrum mask or transmission power required by each channel, and suppresses the out-of-band radiant power for each channel. The type or window transition length of the time-axis window function being can be set as desired for each channel.
従来技術、競合技術の概要(英語) BACKGROUND ART
Due to the expansion of communication capacity, a variety of available channels existing in the frequency band to transmit the bundled have garnered attention. LTE-Advanced wireless LAN system IEEE802 .11ac such as a cellular system, the radio system or the like of the white space IEEE802 .11af, the second generation mobile communication system (5 g system) 5 and the like, which is an international standard associated with formulating completed, or is being made, and research and development has been switched to.
In the above-mentioned system, a modulation scheme such as orthogonal frequency division multiplexing (OFDM: Orthogonal Frequency Division Multiplexing) can be connected by multiple multi-user OFDM orthogonal frequency division multiple access (OFDMA: Orthogonal Frequency Division Multiple Access) is employed. (A) in the OFDM method are orthogonal to each other are arranged so that the number of sub-carriers is mapped to complex modulation symbols, the complex modulation symbols to the inverse discrete Fourier transform of the time series signal is derived, the transmission of OFDM symbols for radio transmission (A) is created. The propagation of the delayed wave in order to suppress the influence of the guard interval (GI) (A) is inserted into the transmitted OFDM symbol. On the receiving side, such as the OFDM symbol (A) after the discrete Fourier transform length is extracted by the discrete Fourier transform, a suitable propagation path estimation and equalization of the transmitted complex modulation symbols of the sub-carrier is derived, it performs reception processing such as demodulating the transmitted data is reproduced.
(A) is OFDM, the transmission capacity of the communication system by the high frequency utilization efficiency has been greatly contribute to improved, high-band radiation power and the power consumption remains a problem in efficiency can be. Particularly dense terminal environment or in an environment such as the white space by secondary use of the suppression of-band radiation power is very important. Out-of-band radiation power in a low-pass filter (LPF) in order to suppress and is valid, a new physical layer signal of the waveform of the LPF-based or like FBMC(Filter bank multicarrier) UF-OFDM(Universal-filtered OFDM) has been proposed. However for example the wireless LAN system 4 g and one of the guard bandwidth in a band LTE(Long term evolution) on both sides does not remain only on the order of at most 0.25MHz. Within the guard band of the narrow-band radiation power is sufficient to implement the LPF to suppress a large amount of calculation scale is required.
However the wireless LAN system 5 g or the like (or carrier aggregation, or channel bonding) called, continuous, continuous or non-bundled a plurality of transmission frequency channels, one of the transmission system has been introduced or a method has been studied in the introduction. Bundling a plurality of channels can be transmitted for effective transmission bandwidth is increased, increasing the transmission capacity of the system.
It is assumed that the communication system is basically uniquely assigned to the operating frequency channel in the band in the all cases. However in a different situation in which the spectrum mask at all distance between the channel bandwidth used by the bundled at the same time is generated. In addition, between adjacent or neighboring channel even if the aggregation is performed, for example a license band communication using the secondary white space communication in the embodiment, the primary adjacent channel is occupied by the user whether or not there is a case where the change required by the spectrum mask, the channel conditions between the different spectrum mask may be bundled for use. Such different spectrum mask condition in the case of using a plurality of channels, each channel satisfies the conditions in the plurality-of-band radiation suppression performance of the LPF must be designed to achieve is generated. In addition, the LPF is a filter in the time axis depending on the design conditions because the length is variable, the system time axis defined by the format in order to satisfy the signal length of the transmission symbol generation processing is complicated or difficult.
The present inventors, without using the LPF, (A) and transmits the OFDM signal (A) with respect to the OFDM signal transmission apparatus, such as the transmission spectrum of the white space frequency band operation is required to define (A) even when the wireless communication OFDM, to sufficiently suppress the out-of-band radiation, within the same band or different bands in a plurality of channels bundled the transmission is carried out at the time of application capable of efficient operation of a universal time axis from the window-type orthogonal frequency division multiplex (Universal time-domain windowed OFDM; UTW-OFDM) method (see Patent Document 1) has been proposed. (A) of the OFDM time window of-band radiation power to the wireless LAN techniques for suppressing is introduced in the center, a conventional request is not severe for the spectrum mask, a significant amount of time axis windows implemented in an environment densely secondary white space such as a utilization environment of a terminal in use may influence the adjacent channel is high. UTW-OFDM system, many conventional time axis used in a very short window length in the window, the maximum symbol length can be extended to the same length, a very large out-of-band radiation power suppression effect can be obtained. In addition, the present invention the window-of-band radiation suppression processing is performed in the time axis it is basically the processing can be achieved and the multiplier, the frequency-axis processing and the convolution processing in the LPF-based approach of the computational complexity increases problem can be solved. The bundled channel conditions different spectrum mask even if transmitted, the time-axis signal of each channel individually assigned to different kinds of universal time axis window (Universal Time-domain Window; UTW) can be easily adapted to the design and therefore, the time length required for the system signal format can correspond to a different channel while satisfying the operational conditions to enable efficient .
  • 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)
  • MIZUTANI, Keiichi
  • HARADA, Hiroshi
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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