【正文】 sson 4: CDMA反向信道 Issue (January 1998) 反向業(yè)務信道的生成 采用 8kb語音編碼 9600 bps 4800 bps 2400 bps 1200 bps ksps R=1/3,K=9 Mcps User Address Mask Long PN Code Generator ksps Orthogonal Modulation Data Burst Randomizer kcps Mcps Q PN (no offset) I PN (no offset) D 1/2 PN Chip Delay Direct Sequence Spreading Convolutional Encoder amp。 Symbol Repetition ? 20ms符號塊被按序重新排列 ?抵抗快衰落的影響 ?4800bps和 4800bps以下速率的重復符號被隔離開來 ? 改善了符號數(shù)據(jù)對衰落的抵抗性能 ? 分散了突發(fā)干擾的影響 輸入陣列 (正常序列 ) 32 x 18 輸出陣列 (重排序序列 ) 32 x 18 ksps to Orthogonal Modulation Course 809 Lesson 4: CDMA反向信道 Issue (January 1998) 反向業(yè)務信道： 64階正交調制 ? 每輸入六個符號，輸出 64個沃氏比特片 ? 六個符號被轉換為一個 063的十進制數(shù) ? 對應該數(shù)的 64位沃氏碼被輸出 1 0 1 1 0 0 1 0 0 0 1 1 Symbols 35 44 Walsh Lookup Table W a ls h C h ip w i t h i n a W a l sh F u n c t io n0 1 2 3 4 5 6 7 1 18 9 0 11 1 1 12 3 4 51 1 1 16 7 8 92 2 2 20 1 2 32 2 2 24 5 6 72 2 3 38 9 0 13 3 3 32 3 4 53 3 3 36 7 8 94 4 4 40 1 2 34 4 4 44 5 6 74 4 5 58 9 0 15 5 5 52 3 4 55 5 5 56 7 8 96 6 6 60 1 2 301230 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 045670 0 0 00 1 0 10 0 1 10 1 1 01 1 1 11 0 1 01 1 0 01 0 0 10 0 0 00 1 0 10 0 1 10 1 1 01 1 1 11 0 1 01 1 0 01 0 0 10 0 0 00 1 0 10 0 1 10 1 1 01 1 1 11 0 1 01 1 0 01 0 0 10 0 0 00 1 0 10 0 1 10 1 1 01 1 1 11 0 1 01 1 0 01 0 0 10 0 0 00 1 0 10 0 1 10 1 1 01 1 1 11 0 1 01 1 0 01 0 0 10 0 0 00 1 0 10 0 1 10 1 1 01 1 1 11 0 1 01 1 0 01 0 0 10 0 0 00 1 0 10 0 1 10 1 1 01 1 1 11 0 1 01 1 0 01 0 0 10 0 0 00 1 0 10 0 1 10 1 1 01 1 1 11 0 1 01 1 0 01 0 0 18910110 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 01 1 1 11 0 1 01 1 0 01 0 0 11 1 1 11 0 1 01 1 0 01 0 0 10 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 01 1 1 11 0 1 01 1 0 01 0 0 11 1 1 11 0 1 01 1 0 01 0 0 10 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 01 1 1 11 0 1 01 1 0 01 0 0 11 1 1 11 0 1 01 1 0 01 0 0 10 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 01 1 1 11 0 1 01 1 0 01 0 0 11 1 1 11 0 1 01 1 0 01 0 0 1121314150 0 0 00 1 0 10 0 1 10 1 1 01 1 1 11 0 1 01 1 0 01 0 0 11 1 1 11 0 1 01 1 0 01 0 0 10 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 01 1 1 11 0 1 01 1 0 01 0 0 11 1 1 11 0 1 01 1 0 01 0 0 10 0 0 00 1 0 10 0 1 10 1 1 00 0 0 00 1 0 10 0 1 10 1 1 01 1 1 11 0 1 01 1 0 01 0