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Mobile Communications: Trends and Broadband Evolution

Explore the evolution of mobile communications towards broadband, high data rates, and integrated systems connecting to the broadband Internet. Discover wireless access trends worldwide, from GHz bands to MM-wave systems and satellite networks.

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Mobile Communications: Trends and Broadband Evolution

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  1. ( ) f t ¥ ò - w j t w = ( ) ( ) F f t e d t - ¥ t - t t 2 / 2 2 ò - w j t = A e d t - t / 2 é ù w w t t A - j j t - 2 2 = e e ê ú A w ë û - j w t æ ö ç ÷ s i n è ø 2 ( ) = t A æ w t ö ç ÷ è ø 2 ( ) p t s i n f ( ) t = A ( ) p t f 1 3 1 - t t t 2 3 2 - - t = ± p p f n t t t n \ = ± f t Frequency Spectrum of Pulse Spectrum of Pulsewith time adulation τis time 時間 0 Pulse waveform パルス信号の波形 Frequency 周波数 Frequencies which give zero spectrum are 0 （n: Integer） Frequency spectrum of Pulse パルス信号のスペクトル

  2. Where do mobile communications go?ーBroadband, Different Systems and Internetー • Towards Broadband communications • High data rate>>>Wide frequency band>>>MM-wave • Personal>>>Compact size terminals>>>small devices • Integrated Systems • Mobile, Wireless LAN, Wireless Access, Home link • Connection to Broadband Backbone Networks • Access to the broadband Internet

  3. Trends of Wireless Access Systems in the World • 5 GHz-band（5.15- 5.25 GHz ：100 MHz) • USA (IEEE 802.11)：20 Mbps, OFDM • Europe (HIPERLAN-2, ETSI BRAN)：20 Mbps, ATM • Japan (MPT) ：20 Mbps, 20 MHz/ch, OFDM • Millimeter-wave（40／60 GHz bands） • SAMBA：For vehicular in 40GHz band • MEDIAN ：High speed wireless LAN in 60GHz band • MMAC : High speed wireless LAN in 60GHz band • Satellite system（Ka-band、Millimeter-wave） • Teledesic：Inter-satellite communication in MM-wave • M-Star: 52Mbps in 50/40 GHz

  4. f=5 GHz or 60 GHz Data=100 Mbps f=60 GHz Data=156 Mbps f=5 GHz Data=25 Mbps f=25GHz Data=25 Mbps Multimedia Mobile Access Communication Systems (MMAC) • Main mission • MMAC are Mobile Communication Systems which can transmit ultra high speed, high quality Multimedia Information "anytime and anywhere" with seamless connections to optical fiber networks. • High speed Wireless Access • Frequency: 5/25/40/60 GHz • Data rate（Quasi-fixed） • 2000 : 25Mbps • 2010 : 156Mbps • Ultra high speed LAN • Frequency : 60 GHz • Data rate • 2000 : 156Mbps • 2010 : 622Mbps printed from MMAC

  5. Millimeter-Wave Video Home Link Systems

  6. Millimeter-Wave Video Home Link Systems -Demonstration experiments inside a real house- Transmitter Receiver Received TV program through a wall. (Transmitter is located in a next room.) Received TV program of BS satellite. Transmitter is fixed on a top of a wall.

  7. Intelligent Transport Systems ITS NW Central Control Station Frequency integrating Converter 12GHz Satellite TV IMT-2000 NW Receiving Station BS 1.5GHz PDC NW 1.9GHz PHS NW BS BS RF/Opt. Conv. YRP Bldg. RF/Opt. Conv. Antenna Optical Cable Radio on Fiber 36~37GHz Road-to-Vehicle 60GHz Intervehicle Experimental Course at YRP

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