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2FSK- 同步检波pe 1= pv (1< v2) = pa ( + n1 c< n2c) = pz ( < 0) = ∫ f( zdz )n 1c ,n 2c 在同一时刻为互相独立的高斯随机变量Z 是高斯变量 2 2Z = a, σZ= 2σn0−∞σZ= ( Z- Z)=(n -n ) = n +n -2n n = 2σn2 2 2 2 221c 2c 1c 2c 1c 2c12 2f(Z) = exp( −(Z −a) / 2 σZ)2πσz2011-9-11 70
2FSK- 同步检波01 rpe1= ∫ f( z) dz=erfc( )2 2−∞同理可求 pe2=1 rerfc( )2 2在大信噪比时 , pe=12π re−r/22011-9-11 71
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第七章数字带通传输
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概述• 基带信号适于
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概述• 数字调制 : 用
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解调的相关概念• 相
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e () t = s() t Acos( ω t)eASKOOK
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2ASK- - 频谱• 谱零点带
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2ASK- 解调• 载频远高
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BPFx(t)抽样判决cosωctcp(t)
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2FSK- - 产生2011-9-11 18
Page 21 and 22: 2FSK- - 频谱通常选 Δω=f1
Page 23 and 24: 2FSK- - 解调条件 : | f − f
Page 25 and 26: 过零检测法判决准则
Page 27 and 28: 2PSK- - 产生• 同一载波
Page 29 and 30: 2PSK- - 产生⎧cos ωct, " 1 "eP
Page 31 and 32: 2011-9-11 31
Page 33 and 34: 2PSK- - 解调波形1 0cos ω c
Page 35 and 36: 2PSK- - 解调Costas 环提取
Page 37 and 38: 载波提取1u = e t e t = m t C
Page 39 and 40: 2DPSK- - 产生利用载波相
Page 41 and 42: a kb k-12PSK(b k)b k2PSK 调制2DP
Page 43 and 44: 2DPSK解调• 相干解调2011
Page 45 and 46: 2DPSK解调2011-9-11 45
Page 47 and 48: 2DPSK- 解调微分整流脉
Page 49 and 50: 2ASK- 包络检波x() t = s () t
Page 51 and 52: 2ASK- 包络检波• 设门
Page 53 and 54: 2ASK- 包络检波p = p(1) P + p
Page 55 and 56: 2ASK- 包络检波• Pe 取决
Page 57 and 58: 2ASK- 同步检波1 b−ap = p(
Page 59 and 60: 2ASK- 性能• 在相同大
Page 61 and 62: 解 : 基带矩形脉冲的
Page 63 and 64: 2FSK- 包络检波在 (0,Ts) 区
Page 65 and 66: 2FSK- 包络检波p10 = p(v1< v
Page 67 and 68: 2FSK- 包络检波• 同理
Page 69: 2FSK- 同步检波v ( kT )1s⎧a
Page 73: The National Constitution provided
Page 76 and 77: 2PSK- 同步检波012 2( 0) exp(
Page 78 and 79: 差分相干检测系统发
Page 80 and 81: 差分相干检测系统2011
Page 82 and 83: 二进制数字调制系统
Page 84 and 85: 误码率的公式2011-9-11 84
Page 86 and 87: 7.4 多进制数字调制系
Page 88 and 89: 数字调制系统衡量指
Page 90 and 91: 用 I-Q 平面表示信号QQS
Page 92 and 93: 7.4.1 多进制振幅键控 (M
Page 94 and 95: MASK 的抗噪声性能• 多
Page 96 and 97: 7.4.2 多进制频移键控 (
Page 99 and 100: 7.4.2 多进制频移键控 (
Page 101 and 102: 7.4.3 多进制相移键控 (
Page 103 and 104: QPSK 信号的波形T sBinaryse
Page 105 and 106: 2011-9-11 105
Page 107 and 108: • 解调方法 - 相干解
Page 109 and 110: 交错的 QPSK(OQPSKOQPSK)• 在
Page 111 and 112: OQPSK 解调2011-9-11 111
Page 113 and 114: QPSK 的误码率• 若发送
Page 115 and 116: 多进制差分相移键控
Page 117 and 118: DQPSK 产生方法• 相乘
Page 119 and 120: DQPSK 解调方法• 和 QPSK
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判决规则 :“+” → 二
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上表中的码元关系可
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• 误码率在大信噪比
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2011-9-11 127
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