【正文】 Rationale reference despreading amp。 (b) In HLST, the coded symbols from constituent encoder k are transmitted by antenna k. (c) In DLST, the coded symbols from a constituent encoder are transmitted by all transmitting antennas in turn. 75 . Wireless Technology Innovation Institute WTI Antenna concepts BB signal processing RF RF RF Advanced antenna concepts improve system capacity coverage and range BB signal processing RF multiple antenna concepts RF . . RF RF RF accuracy for location based services adaptive antenna concepts 76 BB signal processing RF RF frontend frontend diversity concepts WTI Definition Wireless Technology Innovation Institute A smart antenna system bines multiple antenna elements with a signalprocessing capability to automatically optimize its radiation and/or reception pattern in response to the signal environment 77 78 Wireless Technology Innovation Institute WTI a simple framework of SAS Sync amp。 。 。 Premercial System 2022 2022 2022 57 WTI Wireless Technology Innovation Institute WiMAX、 Wibro 58 Wireless Technology Innovation Institute WTI 59 Wireless Technology Innovation Institute WTI 60 Wireless Technology Innovation Institute WTI Wireless Technology Innovation Institute WTI Mobility Vehicle speed (60 km/h, 120 km/h) Good performance while on the move IP Compatible with Inter world Diverse terminal types (PC/PMP/PDA/Phones etc) Broadband 1Mbps per user Broadband uploading capability 61 What is WiBro? WiBro (Wireless + Broadband) Harmonization with Mobile WiMAX Based on IEEE Standard An OFDMA based Profile of IEEE Standard 62 WTI Wireless Technology Innovation Institute WiBro on the Evolution Paths to 4G 1995 2022 200 Mbps ~ kbps 50 Mbps 144 kbps 2022+ 384 kbps 2G (Digital) 1G (Analog) GHz WLAN 4G PAN 5 GHz WLAN Fast Slow 1Gbps DM OF A 2022 CDMA 5 GHz WLAN 3G (IMT2022) WiBro EVDO 63 WTI Wireless Technology Innovation Institute WiBro on the Evolution Paths to 4G 2022~2022 Cellular Based (3GPP, 3GPP2) Inter Based (IEEE) cdma2022 1x EVDO WCDMA Rev. A 2022~2022 2Mbps/2Mbps 153kbps/ 153kbps/ 307kbps 2022~2022 2Mbps/ WCDMA(R6) HSUPA WCDMA(R5) HSDPA 4G 54Mbps 75Mbps(Fixed) 6Mbps/ WiBro Harmonization 11Mbps 100Mbps WiBro2 2022~2022 30Mbps EVDO Rev. B EVDO Rev. C * 3G LTE HSOPA WTI Wireless Technology Innovation Institute WiBro Requirements Major System Parameters Radio Access Requirement TDD OFDMA 10 [MHz] Duplexing Multiple Access Channel BW Frequency Reuse Factor Mobility Service Coverage Spectral Efficiency [bps/Hz/cell(sect.)] Handoff Throughput (per user) 1 ≤ 60 [Km/h] ≤ 1 [Km] Max. DL / UL = 6 / 2 Aver. DL / UL = 2 / 1 ≤ 150 [ms] Max. DL / UL = 3 / 1 [Mbps] [Kbps]64 Wireless Technology Innovation Institute WTI 概 要 4G的技術(shù) 物理層技術(shù) 無線接入網(wǎng) 終端及業(yè)務(wù) 4G TDD試驗網(wǎng)絡(luò)介紹 65 66 WTI Wireless Technology Innovation Institute 物理層技術(shù) OFDM 多載波技術(shù) MIMO多天線技術(shù) 鏈路自適應(yīng)技術(shù) 智能天線 67 Wireless Technology Innovation Institute WTI Wireless Technology Innovation Institute WTI OFDM was patented in the . in Jan. 1970 (1) The plexity of realtime FT. (2)The stability of oscillators in Tx and Rx. (3)The linearity requirement in RF power amplifier. 68 First appearing In the late 1950s and early 1960s, the first system using MCM (military HF radio links) 69 WTI Wireless Technology Innovation Institute Now is reborn again Application requirements Broadband High speed multimedia, not only fixed broadcasting service, but also to support mobile applications. Hardware Conditions 1)advance in digital signal processing 2)VLSI technology Wireless Technology Innovation Institute WTI The success applications of OFDM techniques 1960s, the OFDM technique was used in several high frequency military systems such as KINEPLEX, ANDEFT and KATHRYN. 1980s, OFDM was studied for highspeed modems etc. 1990s, OFDM was exploited for wideband data munications over radio FM channels, such as HDSL ( Mbps), ADSL (6Mbps), VDSL( 100Mbps) , DAB and HDTV. 70 71 Wireless Technology Innovation Institute WTI o Orthogonal frequency division multiplexing multiplexing technique To bine the different parallel information streams into one one river. o Orthogonal frequency division modulation modulation technique Using the information streams to modulate the high carriers. o Orthogonal frequency division multiaccess multiple access Using the different frequency band to identify the access users. What is OFDM on earth? 72 Wireless Technology Innovation Institute WTI 73 Wireless Technology Innovation Institute WTI ? Demultiplex data onto different transmit antennas and use different codes to label data stream. ? MIMO (BLAST): 4 data streams per spreading code. Laptop advanced Techniques Multiple Input Multiple Output (MIMO)