【正文】 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(yàn)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) ? Full space diversity. 平坦衰落信道 ... ... WTI Wireless Technology Innovation Institute 分層空時碼 串 /并 編碼 調(diào)制 解調(diào) 信道 估計(jì) 譯碼 74 Rx1 Tx1 Tx2 TxM Rx2 RxN Wireless Technology Innovation Institute WTI C3 C2 C1 C0 。擴(kuò)頻信號頻譜近似白噪聲，若不知 PN序列生成方 法就難以獲取原始信息 隱蔽性好。 反向信道 用來從移動用戶向基站傳送信息的無線信道。 收發(fā)信機(jī) 能同時發(fā)送和接收無線信號的設(shè)備。 2022年 3月， 3GPP TSGRAN同意將兩種 TDD技術(shù) 進(jìn)行融合。 Despreading Rx(UL) Beamforming Frequency amp。 Appl Trial amp。 WTI 大于信道的相關(guān)時間 用信道相關(guān)時間設(shè)計(jì) 交織編碼的深度 18 Wireless Technology Innovation Institute 時間分集技術(shù) 信號強(qiáng)度 RAKE接收機(jī) 多徑 的每一徑時延不同， 進(jìn) 行多徑分離合并 ARQ技術(shù) 重發(fā)時間 信號強(qiáng)度 19 WTI Wireless Technology Innovation Institute 抗多徑影響 — RAKE接收機(jī) Wireless Technology Innovation Institute WTI CDMA擴(kuò)頻技術(shù)原理 擴(kuò)頻原理： 以頻帶換取信噪比 香農(nóng)理論： C=Bw log2 (1+S/N) 擴(kuò)頻系統(tǒng)的優(yōu)點(diǎn)： 抗干擾能力強(qiáng)，可抗白噪聲、人為干擾、多徑干擾等 保密性好。 前向信道 用來從基站向用戶傳送信息的無線信道。 Wireless Technology Innovation Institute WTI 第一代模擬蜂窩移動通信系統(tǒng) 歷史回顧 ： 1978年，美國的貝爾實(shí)驗(yàn)室成功開發(fā)了 AMPS（ Advance Mobile Phone Service）系統(tǒng)，實(shí)現(xiàn)了真正意義上的可以隨時隨地通信的大容量的蜂窩 移動通信系統(tǒng)。 30 Wireless Technology Innovation Institute WTI TDSCDMA技術(shù) 基本參數(shù) 載波間隔 /碼片速率： 要求的最小帶寬： 5MHz（支持 3個載波間隔） 操作模式： TDD 幀長度 /時隙數(shù)： 10ms(2個 5ms子幀 )/14時隙 (每個子幀 7 個時隙 ) 擴(kuò)頻因子： 1/2/4/8/16 射頻調(diào)制方式： QPSK, 8PSK, 16QAM (滾降因子 ) 數(shù)據(jù)速率： 8kbps…384kbps…2048kbps 對稱和 非對稱數(shù)據(jù)業(yè)務(wù)模式 電路與分組交換 聯(lián)合檢測、智能天線、基于用戶定位的 Baton切換 多基站同步、多模的軟件無線電 31 Wireless Technology Innovation Institute WTI TDSCDMA技術(shù) 物理層 低碼片速率 :(WCDMA的 1/3) 適合智能天線和同步 CDMA的幀結(jié)構(gòu)，以及相應(yīng)的過程 用 智能天線 +多用戶檢測聯(lián)合算法達(dá)到全部資源同時工作 的效果 采用和 3GPP相同的調(diào)制、信道編碼、交織和復(fù)接技術(shù) 提供不對稱上下行業(yè)務(wù) 功率控制和上行同步控制 : 控制頻率 :0200次 /秒 功率控制步長 :13dB 同步控制精度 :1/8碼片寬度 開環(huán)和閉環(huán)控制 32 33 WTI Wireless Technology Innovation Institute 4G與以前移動通信系統(tǒng) 可能的不一樣 Wireless Technology Innovation Institute WTI MS 1 MS 2 30－ 80 公里 ? ? ? 高功率（ 200－ 250w）的發(fā)射天線 幾百甚至上千平方公里的范圍的覆蓋 每個大區(qū)的可用信道數(shù)很少 MTSO 蜂窩系