第三章

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谘娈钭
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1 (Multicode Interference Cancellation) WCDMA 量 (capacity) (Multiple access interference, MAI) (ear/far effect) 來料 (MCIC, Multicode interference cancellation) 路 (MPIC, Multipath interference cancellation) 度 3. 列 (DS-CDMA) ( 3.) (Single user detection) (correlator) 濾 (Matched filter) 料 [7] 律 (interference) 來料不 9

2 (Auto-correlation) (Cross-correlation) ρ ik, 數 T b ρ = g (), t g () t = g () t g () t dt (3.) ik, i k 0 i k Tb ρii i k ρ ik, 0< ρik, < i = k, 異不零料 (Multicode interference, MCI) 不數率 MCI 更 (Interference-limited) Match Filter bank T b t = it b y ˆd g () t rt () T b t = it b y ˆd g () t T b t = it b y dˆ g () t 3. DS-CDMA 30

3 異不零料 MAI MAI 率 (Power control) (Channel coding) (Smart antenna) [8-9] 論便料參行料 (Base station) 行 (Mobile station) (downlink) ( 行 ) 行行 (uplink) ( 行 ) 行不 CDMA 不 MAI 數略量來 WCDMA 3

4 3. (estimation) (reconstruction) (cancellation) [9-] 理都料料行來精行 (error propagation) 3.. 行行了行良率行濾行 3

5 MCI 行料料 3. 數行 [] d k = sgn( yk Ajρ jkd j ) (3-) j k T 0 y Decision b s () t Decision Decision yt () T 0 ρ A ρ A A A s() t Decision Decision T 0 y Decision b 行數行行理料不理度行行行理都行來度更度精行 33

6 念 3.3 st stage nd stage Data Detector for Code () d () I Data Signal Reconstruction i MCI Cancellation for Code Data Detector for Code () d () I Data Signal Reconstruction H () t Ht () Data Detector for Code () d () Data Signal Reconstruction I i MCI Cancellation for Code Data Detector for Code () d () Data Signal Reconstruction I rt () Channel Estimation H () t Channel Estimation H () t Data Detector for Code () d () Data Signal Reconstruction I i MCI Cancellation for Code Data Detector for Code () d () Data Signal Reconstruction I H () t H () t 行流料領 (pilot signal) 料 BPSK 領來行了兩 [3] (channelization code) 亂 (scrambling code) 來料領 (Walsh code) cp [ n] cd [ n] u u 兩亂亂來不 cell 34

7 良金 (Gold code) cs [ u n ] 降 [4] Spreading code Spread data Coded high rate data stream Multi- code demux Spread data Spreading code Scrambling code + Spread data Spreading code Random bit stream BPSK Mapping Spreading Pilot signal 3.3. 兩不零不異 [5] (Hadamard matrices) H 度 = n 35

8 H = [ ] H = H H H = = 4 H H H h H/ H/ = h H / H/ h (3-3) h H i 列列量度 i 兩不列 T i = j hh i j = hh ik jk = (3-4) k = 0 i j 兩異若不異不零 3.3. m- 列列 0 率列 (Random binary sequence) m- 列 (Linear feedback shift register) 列 (Balance property) m- 列數 0 36

9 數 (Run property) run 0 列連度例 run 度率 run 度率 4 run 度 3 率 8 度 m m- 列 run 數 m ( + ) (Correlation property) m- 列數 m- 列 m m 度 Tb p() t 數 R pt pt dt T Tb c( τ ) = T ( ) ( ) b T τ b b = T c (3-5) T 切 m- 列數 c ( + ) t T t Tc R ( ) c c τ = for the remainder of the pefiod (3-6) 金 WCDMA (Pseudo random code) 狀都不狀 37

10 金數列金金兩 (preferred pair) m- 列 m 列 a b 列 a b 度 = m- 列 a = { a } = ( a a... a ) n 0 b = { b } = ( bb... b ) n 0 (3-7) a b 金 : G T T (, ab) = {, aba, ba, ba, b,, a T b} (3-8) i T (shift operation) m + 金列 tm ( ) tm ( ) tm ( ) + tm ( ) = + m+ m+ 若 m 數若 m 數 (3-9) G ( ab), 兩 3.4 類 (Static channel) (Mobile radio channel) (AWG, Additive White Gaussian oise) 38

11 路 (Fixed two-path channel) 路 ht () = δ () t + δ( t τ) (3-0) τ 路路路 (Two-path fading channel) ht () = a() tδ () t + a() tδ( t τ) (3-) a () t a () 兩路數益 t 兩立 (independent) (Jake s fading channel model) a ( t) = exp( j π f t+ φ ) k, = (3-) k n k, n f n= f n π n = fd cos( ) d f f 都勒率 (Doppler frequency) φ kn, k 路 n 3.5 S(t) u S(t) h ( t) hu ( t) W(t ) r(t) S(t) U hu ( t) 39

12 3.5 來不立 U rt () = su() t hu() t + Wt () (3-3) u= su() t u h () t u u Wt () (AWG) 3.6 MCIC 路 MCIC 了 3 (CEIGU, channel estimate and interference replica generation units)[6] 數來 CEIGU 40

13 Antenna To next stage delay delay delay CEIGU () I c=,,..., U CEIGU () I c=,,..., U CEIGU (3) I c=,,..., U () U () st stage Iˆ nd stage () 3rd stage + Σ I Iˆ c + Σ I c c= ( c i ) U () c= ( c i ) 3.6 MCIC CEIGU 3.7 CEIGU 濾 (MF, match filter) 不復亂亂來來 3.7 濾行 MCI 3.6 行料料 U R( k) Si( k) Hi( k) i= (3-4) S ( k ) i i H ( k ) i i 4

14 U MF P/S Recovered data *() G i Pilot interference reconstruction Post channel processing K S/P Data Modulator Channel estimator Spreader ^ () I c=,,..., U Spreader () ^ I 3.7 CEIGU (MCIC) 4

15 U Rake combiner P/S Recovered data Pilot interference reconstruction K S/P Data Modulator Channel estimator Spreader ^ ( n) I c=,,..., U Spreader ^ I ( n) 3.8 CEIGU (MCIC) 43

16 數料率降更料料 MCIC MPIC 44

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