现代通信原理(曹志刚)习题答案2--11章

第二章第三章第四章00第五章第七章第八章第九章9.4解：011010000100011000000010AMIHDB3B3zsB6zs9.13解：9.14解：（2）发送：8电平已调基带信号信号接收：调制信号基带信号9.17单极性NRZ)2(NSQPb双极性NRZ)(NSQPb多进制双极性（M为奇数:取0，+/-A,…..;M为偶数：取2A。。。）sMbLfRLLsMbfRsMbfRsMbRbbbb/2log47)12)(4(/67.05.11)3(/38log)2(/1)1(22调相。，调制方式可为调幅或其带宽正好是的升余弦滚降频谱信号电平信息，所以可采用单位符号应传输所需传输速率信道带宽kHzbitkHzRkHzkHzkHzfb482.0831204860108)1(升余弦滚降滤波器线性调制解调器抽样判决格雷编码方式普通二进制编码sbsnnbsPnPPMNSQMMP1P)12(22)13)(()1(222L-1电平的部分响应信号])(134[)1(2222NSLQLLPs1）75.4101)(6Q2）75.4101)(6Q3）36.444/6.4)(18332NSNSPPbs4)])(1434[4)14(2222NSQPssbPPLL324712而或sbPP21S/N(DB值)：45.125(16.44)，22.6(13.5),444.36(26.4),194.6(22.9)9.181）25.4S/N=18.06合12.57dB2)])(83[NSQPbS/N=48.16合16.83dB3）sbPP32S/N=90.3合19.56dB9.23解：第十章10.1(1)101100102ASK序列的三条性质。序列，因为不符合该序列不是）（为全，则起始状态若为全mmaaaaa211)1(654062FSK2PSK(2)101100102ASK2FSK2PSK10.3解：发送端：二进信息DPSK信号abdc1100100010ab(或反相)cd(或反相)接收端：（1）相干解调差分编码相乘器载波发生器二进信息DPSKacdef信号b本地载波位定时abcdef（2）延迟解调：DPSKacde二进信息信号b位定时abcde10.14解：按接收机难易程度分：易2ASK2FSK2PSK难带通相乘器8低通抽样判决器码（反）变换器带通相乘器8低通抽样判决器延迟Ts按误比特率为10-4时所需的最低峰值信号功率小2PSK2FSK=2ASK大10.18解：10.26解：HzfBHzffffffTsbfHzfBfffTTfTfTfdBsbffHzfHzfBffPSKfsbfHzfHzHzHzfBffQPSKfBBbBbBbbBbBbBBBSbSSbSSbSSbSS97.1865298.932106sin11032sin13,/4800,5.095.159821022sin1/2102sin1,11022sin1,6)3(/48003160024005.13185.1)2(/24001200240060030002212)1(206206206206206时时则带宽为的符号率基带信号带宽为的符号率基带信号带宽为11.3解:11.6解:dBBnRENSnEnEQPdBBRnEBRnENSnEnEQPbbQAMbbQAMbSSSSPSKSbPSKb45.192.88240096002.412152.415121016264)14(2215.232232400240016sin212.44112.416sin21016sin2212016205016,22001622052016,0011101111010001110101101001101111010001110101101001111modmod1mod12423536243235236124生成的系统循环码为GDDDDDDDDDDDGDDDgDDrDDDDgDDrDDDgDDrDDDDg11.22解:110100011010111001100101010111001011)3,6(1101000011010011100101010001100101101011100010111)4,7(GHGH码的监督阵和生成阵为督矩阵分别为汉明码的生成矩阵和监dBdBnEnEnEQPPPPCdBnEnEnEQPCPPiCPQnkMnEQnkMnMEQMPPSKbbbeeeebbbbiieieibbbe2.54.126.174.1264.11276416sin81276416sin821025.0)1(111271106.1716sin82.416sin8211010,1009.495.005.01112711127110)64,127(05.024.121sin821sinlog2log216020201061111127502020553106111112712711127127202022编码增益为加纠错后误比特率为不加纠错时译码后误比特率个错码汉明码可以纠正的误比特率为