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1、精选学习资料 - - - - - - - - - We will continue t o improve t hhe companys internal control system, and steady improvement in ability to manage and control, optimize business processes, to ensure smooth processes, responsibilities in place; to further stre ngthen internal controls, play a control post ind
2、ependent oversight rol e of evaluation complyii health a ng with third-party responsi si bility; to actively make use of inter er nal audit tools detect potential management, streamline, standardize related transactions, strengthening operations in a a ccordance with law. De epe ning t he informatio
3、n management to ensure full communication zero resistance. o constantly perfect ERPand BFS+, and PI, a nnd MIS, and SCM, information system based construction, full integration i n i nformation system, achieved information resourceensure the s shared; t t o expand Portal system applicati ti on of br
4、eadth and depth, play information system m on enterprise of Assistant role; to perfect daily run maintenance operation of records, promote problem reasons analysis and system handover; to strengthening BFS+, and ERP , a nd SCM, technology aube ppli cation of training, improve employees a pplication
5、information system of nt, andcapacity and level. Humanisti c c care t o ensure zero. To strengthening Humanities care, continues to foster company wind clear, and gas are, and heart Shun of culture atmosphere; stre re ngthe ning love helpe d trappe e d, care difficult lt employees; carried out style
6、 a a ctivities, rich em ployees life; strengthening a nd labour prote ction, organization career healt h medical, control career against; continues to implementation psy sy chological wani ng prevention system, traini i ng employees health of character, a nnd stable of mood a a nd enterprising of at
7、titude, created friendly fraternity of Humanities environment. T T o strengthen risk management, e e nsure that the business of zero risk. To strengt gt hened busi ness plans management, will busi ness business plans cover to all level, business can control in contr ol; to close concern financial, a
8、nd coal electric linkage, a nd energy-saving scheduling, national policy trends, strengthening track, active should; to implementation State-owned a ssets met t hod, further spe cification busi si ness financial manageme nt; to perfect risk tcontrol system, achieved risk re e cog nition, and measure
9、, and assessmereport, and control feedba ck of cl l ose d ring management, improve risk preventi ti on capa a city. To further standardize trading, and strive to a a chieve accor or ding to law , standar ar dize and fair. Innovation of performance management, to ensure that potential employees zero
10、fly. To strengthen performance management, process control, enha nce employee evaluati ati on and level l s of effective communication to improve performance management. To further quantify and refine employee standards . Work, full play part rt y, and branch, and members in five type Enterprise con
11、struction in the of core role, and fighting fortress role and pioneer model role; to continue s to strengtheni ni ng four good leadership construction, full play levels cadre s in enterprise devel el opment in the通信原理复习题一、单项选择题1数字通信相对于模拟通信具有（ B ）。A 占用频带小 抗干扰能力强 C传输容量大 易于频分复用2以下属于模拟信号是（ A ）。A PAM 信号
12、PCM信号 C M 信号 DPCM信号3以下信号属于模拟信号的是（ B ）。A PCM 信号 BPAM信号 C M 信号 DDPCM信号4以下属于数字信号是（ D ）。A PAM 信号 PDM信号 CPPM 信号 PCM信号5对于 M进制的离散消息源消息源，其平均信息量最大时的概率分布为（ A ）。A 均匀分布 B正态分布 C瑞利分布 D指数分布6通信系统可分为基带传输和频带传输，以下属于频带传输方式的是（C ）。A PAM 传输方式 BPCM传输方式 C PSK 传输方式 DM 传输方式7通信系统可分为基带传输和频带传输，以下属于基带传输方式的是（ B ）。A PSK 传输方式 BPCM传输
13、方式 C QAM传输方式 DSSB传输方式8按信号特征通信系统可分为模拟和数字通信系统，以下为数字通信系统的是（D ）。A 采用 PAM 方式的通信系统 B 采用 SSB方式的通信系统C采用 VSB 方式的通信系统 D采用 PCM方式的通信系统9在 数字通信系统中， 传输速率 属于通信系统性能指标中的（ A ）。A 有效性 B可靠性 C适应性 D标准性10以下属于码元速率单位的是（ A ）。A 波特 B比特 C波特 /s D比特 /s11在 模拟 通信系统中，传输 带宽 属于通信系统性能指标中的（ B ）。A 可靠性 B有效性 C适应性 D标准性12产生频率选择性衰落的原因是（C ）。A 幅频
14、畸变 相频畸变 C多径传播 瑞利衰落13若采用空间分集技术，抗选择性衰落较差合并方式为（A ）。A 最佳选择方式 最大功率合并方式 C最小色散合并方式 最大信噪比合并方式14以下属于恒参信道的是（ D ）。A 微波对流层散射信道 B 超短波电离层散射信道C短波电离层反射信道 D微波中继信道15改善恒参信道对信号传输影响的措施是（C ）。A 采用分集技术 B 提高信噪比 C采用均衡技术 D降低信息速率16随参信道所具有的特点是（ D ）。A 多经传播、传输延时随时间变化、衰落B 传输损耗随时间变化、多经传播、衰落C传输损耗随时间变化、传输延时随时间变化、衰落D传输损耗随时间变化、传输延时不随时间
15、变化、多经传播名师归纳总结 17根据信道的传输参数的特性可分为恒参信道和随参信道，恒参信道的正确定义是（B a hig her level of devel）。opment. Employees, today is lunar calendar on ）。December 24, the ox Bell is about to ring, at this time of year, we clearly feel the pulse of the XX power generation company to flourish, to more clearly hear XX power gen
16、eration companies mature and symmetry breathing. Recalling past one anot her across a railing, we are enthusiastic and full of confidence. Future development opportunities, we more exciting fight more spirited. Employees, let us A 信道的参数不随时间变化B 信道的参数不随时间变化或随时间缓慢变化C信道的参数随时间变化D信道的参数随时间快速变化18以下信道属于随参信道的
17、是（ B ）。A 电缆信道B短波信道C光纤信道D微波中继信道19调制信道的传输特性不好将对编码信道产生影响，其结果是对数字信号带来（B A 噪声干扰of backbone backbone role; to full strengthening members youth work, full play youth employees in company develB码间干扰opment in the of force role; to improve independent Commission against corruption work level, strengthening on
18、 enterprise business key link of effectiveness monitoreC突发干扰d. , And maintain stability. To further strengthen publicity and education, improve the overall legal system. We must strengtD噪声干扰和突发干扰hen safety management, establish and im prove the education, supervision, and evaluation as one of the tr
19、affic safety management mechanism. To conscientiously sum up the Olympic security controls, promoting integrated management to a higher level, higher standards, together across 2013 full of challe e nges a nd opportunities, to create a green, l l ow-cost operation, full ull of humane care e of a wor
20、ld-class power generation company and work hard! The occasi on of the Spring Festival, my sincere wish that you and the families of the staff in the new year, good d health, happy, happy第 1 页，共 35 页- - - - - - -精选学习资料 - - - - - - - - - We will continue t o improve t hhe companys internal control sys
21、tem, and steady improvement i i n ability to manage and control, optimize business processes, t t o ensure smooth processes, responsibilities in place; to further stre e ngthen internal controls, play a control post independent oversight rol e of evaluation complying with third-party responsibility;
22、 to actively make use of internal audit tools detect potential management, streamline, standardize related transactions, strengthening operations in a ccordance with law. Deepening t he information management to ensure full communication zero resistance. o constantly perfect ERPand BFS+, and PI, a n
23、nd MIS, and SCM, information system based construction, full i ll i ntegration information system, achieved information resourceensure the s shared; t t o expand Portal system applicati ti on of breadth and depth, play information system m on enterprise of Assistant role; to perfect daily run mainte
24、nance operation of records, promote problem reasons analysis and system handover; to strength h eni ng BFS+, and ERP , a nd SCM, technology aube ppli cation of training, improve employees a pplication information system of nt, andcapacity and level. Humanisti c c care t o ensure zero. To strengtheni
25、ng Humanities care, continues to foster compa ny wind clear, and gas are, and heart Shun of culture atmosphere; strengthening l l ove helpe d trapped, care difficult employees; carried out style activities, rich em m ployees life; strengthe e ning health and labour protection, organization career he
26、alth medical, control career against; continues to implementation psychological warni ni ng prevention system, training employees health of character, a nnd stable of mood and enterprising of attitude, e, created friendly fraternity of Humanities environment. T T o strengthen risk management, e e ns
27、ure that the business of zero risk. To strengt gt hene d busi si ness plans manageme e nt, will busi ness business plans cover to all level, business can control in contr ol; to close concern financial, and coal electric linkage, and energy-saving scheduling, national policy trends, strengthening tr
28、ack, active should; to implementation State-owned a ssets met t hod, further spe cification business financial manageme nt; to perfect risk tcontrol system, achieved risk re e cognition, and measur r e, and assessmereport, and control feedba ck of cl l ose d ring management, improve risk preventi ti
29、 on capacity. To further standar ar dize trading, and strive to a a chieve according to law, sta ndardize and fair. Innovation of performa a nce management, to ensure that potential empl pl oyees zero fly. To strengthen pperformance management, process control, enha nce employee evaluation and level
30、s of effective communication to improve performance management. To further quantify and refine employee standards . Work, full play part rt y, and branch, and members in five type Enter r prise construction in the of core role, and fighting fortress role and pioneer model role; to continue s to stre
31、ngtheni ni ng four good leadership construction, full play level el s cadres in e nterprise devel el opment in the20改善随参信道对信号传输影响的措施是（B ）。A 提高信噪比B采用分集技术C采用均衡技术 D降低信息速率21连续信道的信道容量将受到“三要素 ”的限制，其 “ 三要素 ” 是（ B ）。A 带宽、信号功率、信息量B 带宽、信号功率、噪声功率谱密度C带宽、信号功率、噪声功率D信息量、带宽、噪声功率谱密度22以下不能无限制地增大信道容量的方法是（ D ）。A 无限制提高信
32、噪比B无限制减小噪声C无限制提高信号功D无限制增加带宽23根据 香农公式 以下关系正确的是（A ）。A 信道容量一定，信道的带宽越宽信噪比的要求越小；B 信道的容量与信道的带宽成正比；C信道容量一定，信道的带宽越宽信噪比的要求越高；D信道的容量与信噪比成正比。24设基带信号频谱如右图所示，以下模拟调制后的频谱A. 中抑制载波的双边带调幅(DSB)是（ B ）。B. C. D. 25设基带信号频谱如右图所示，以下模拟调制后的频谱中属于名师归纳总结 单边带调幅（ SSB）的是（ C ）。D endar on December 24, t）。he ox Bell is about to ri ng,
33、 at this time of year, we clearly feel the pulse of the XX power generation company to flourish, to more clearly hear XX power generation companies mature and symmetry breathing. Recalling past one anot her across a railing, we are enthusiastic and full of confidence. Future development opportunitie
34、s, we more exciting fight more spirited. Employees, let us A B CD26设已调制信号的波形如图所示，其中属于SSB波形是（C ）。A B CD27设已调制信号的波形如图所示，其中属于DSB 波形的为（B ）。A BCD28模拟调幅中DSB、SSB、 VSB 的已调信号所 占用带宽大小 关系为（B ）。A DSB SSBVSB DSB VSBSSB CSSB DSB VSB VSBSSBDSB29以下不属于 线性调制 的调制方式是（ D ）。A AM DSB C SSB FM30各模拟线性调制中，已调信号占用频带最小 的调制是（C ）
35、。A AM BDSB CSSB DVSB31在等概的情况，以下数字调制信号的功率谱中不含有离散谱的是（ D ）。A ASK BOOK CFSK DPSK 32设某传输码序列为+1-100-1+100+1-1000-1+100-1 ，在接收端正确恢复出的数字序列为（A C33设某传输码序列为0-20+2+2000-2-2-2，在接收端正确恢复出的数字序列为（B ）。A B CD 34设某传输码序列为0-20+2+2000-2-2-2 ，该传输码属于（ A ）。A 相关码B差分码C双相码D绝对码35设某传输码序列为+1-10000+100-1+100-1+100-1 ，该传输码属于（D ）。A R
36、Z 码BHDB3码 CCMI码 D AMI 码36设某传输码序列为+1-100-1+100+1-1000-1+100-1，该传输码属于（C ）。A AMI 码 CMI 码C码 RZ 码37我国 PCM数字设备间的传输接口码型是（ B ）。A AMI 码B HDB3码 CNRZ码 DRZ 码38以下数字码型中，功率谱中含有时钟分量码型为（ B ）。A NRZ 码of backbone backbone role; to full strengthening members youth work, full play youth employees in company development i
37、n the of force roleBRZ 码; to improve independent Commission against corruption work level, strengthening on enterprise business key link of effectivenesCAMI 码s monitored. , And maintain stability. To further strengthen publicity and education, improve the overall legal system. We must strengthen saf
38、ety management, establish and im prove the educatiDHDB3码n, supervision, and evaluation as one of the traffic safety management mechanism. o conscientiously sum up the Olympic security controls, promoting integrated management to a higher level, higher standards, a higher level of development. Employ
39、ees, today is lunar caltogether across 2013 full of challe e nges a nd opportunities, to create a green, low-cost operation, full of humane care of a world-class power generation company and work hard! The occasi on of the Spring Festival, my sincere wish that you and the families of the staff in th
40、e new year, good health, happy, happy第 2 页，共 35 页- - - - - - -精选学习资料 - - - - - - - - - 名师归纳总结 We will continue t o improve t e t he companys internal control system, and steady improvement in ability to manage and control, optimize bbusiness proce ssses, to ensure smoot h pr ocesses, re re sponsibil
41、ities in place; to further strengthen internal controls, play a control post independent oversight rol e of evaluation complying with third-party responsibility; to actively make use of internal audit tools detect potential management, streamline, standardize related transactions, strengthening operations in accordance with law. Deepening t he information management to ensure full communication zero re re sistance. o constantly perfect ERPand BFS+, and PI, a nnd MIS, a nnd SCM, informatio