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通信原理试卷A及答案.doc
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通信原理试卷A及答案.doc
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清水混凝土的配合比设计中,要针对当地水泥、砂石、外掺料及外加剂等原材料影响混凝土质量的多种因素进行分析,确定主要控制因素,并从经济性和使用要求综合考虑,优选出符合生产条件的最优方案组合。obstacles, correcting misunderstandings, advocate good cadre style. 2, adhere to the scientific decision-making and democratic decision-making decision-making law. Correctly handle to ensure that government decrees and based on the actual creative work, giving full play to subjective initiative, put an end to implement the conference meeting, to document the implementation of documents etc. Improve the scientific and democratic decision-making mechanism, improve and implement the decision to solicit the views of experts, the public hearing system. Improve the important decision of risk assessment mechanism and legal review mechanism. 3, to promote team unity. Uphold and improve the system of annual party book talk heart to heart, mind and Party members, Party members to exchange each other not less than 2 times. The implementation of sound team democratic life system, consolidate and enhance the party's mass line educational practice will promote the achievement of the topic of democratic life, criticism and self-criticism normalization, a long-term. Adhere to the party on the basis of the principle of unity, enhance internal communication, strengthen internal supervision, self Sleep maintenance team collective image and authority. (three) to ensure the execution is not strong or disguised to resist government decrees issues. Individual Bureau leadership team members lack of learning political theory system, not from the objective reality, not with the party's interests above all the principles to deal with personal problems. In the specific work safety supervision in the execution is not strong, in the implementation of the decision to deploy the discount, make choices, engage in work, the implementation of the agreement, uncomfortable is not performed, open or disguised to resist, the lack of subject consciousness of the party organization, the lack of resist in society all kinds of bad habits and unwholesome tendencies of courage Gas and courage. Such as the liability insurance of safe production work, individual leaders that have someone arrested, and no funding, not in the global chess perspective to the countryside to carry out daily inspection, found none of my business acceptance of the resumption of production in an armchair, with a pen, indifferent. Corrective measures: (LED Leadership: Luo Mingjun, rectification time: before September 25th, insist for a long time) 1, to strengthen the sense of responsibility, work to solve the lack of decent occupation explain away, conduct problems. To establish the overall concept, eliminate departmentalism. Strict assessment and accountability, to solve the spiritual slack, nianqingpazhong, status quo, To establish and perfect the muddle along and other issues. Bureau staff conduct work regulations, standardize the behavior of personnel. 2, strengthen the responsibility system. One is the in-depth study and implement the "Hunan provincial Party and government leading cadres Interim Provisions on the work safety of a pair of > (Hunan Office issued 2013 No.
一 填空题:(每个空 0.5 分,共 15 分)
1. 基带传输系统的总误码率依赖于 和 之比。
2. 调制信道对信号的干扰分为 和 两种。
3. 若线形系统的输入过程
��
t
i
�
是高斯型的,则输出
��
t
o
�
是 型的。
4. 通断键控信号(OOK)的基本的解调方法有 及 。
5. 随参信道的传输媒质的三个特点分别为 、 、 。
6. 根据乘性干扰对信道的影响,可把调制信道分为 和 两大类。
7. 包络检波法的系统误码率取决于 和 。
8. 起伏噪声又可分为 、 及 。
9. 数字基带信号
��
tS
的功率谱密度
� �
�
S
P
可能包括两部分即 和 。
10. 二进制振幅键控信号的产生方法有两种,分别为 和 。
11. 模拟信号是利用 、 和 来实现其数字传输的。
12. 模拟信号数字传输系统的主要功能模块是 、数字传输系统和 D/A。
13. 设一分组码();则它的码长是 ,码重是 ,该分组码与另一分组码()的码距是 。
二 判断题:(正确划“√”,错误划“ ×”;每题 0.5 分,共 5 分)
1. 码元传输速率与信息传输速率在数值上是相等的。( )
2. 一般说来,通过键控法得到二进制移频建控信号(2FSK)的相位(
n
�
、
n
�
)与序列
n
无关。( )
3. 任何一个采用线性调制的频带传输系统,总可以由一个等效的基带传输系统所替代。( )
4. 白噪声是根据其概率密度函数的特点定义的。( )
5. 基带传输系统的总误码率与判决门限电平有关。( )
6. 对于受到高斯白噪声干扰的连续信道, B 与
NS
可以互换。( )
7. 恒参信道对信号传输的影响是变化极其缓慢的,因此,可以认为它等效于一个时变的线
性网络。( )
8. 对于受到高斯白噪声干扰的连续信道,若增加信道带宽 B,则信道容量 C 无限制地增加。
( )
9. 小信噪比时,调频系统抗噪声性能将比调幅系统优越,且其优越程度将随传输带宽的增
加而增加。( )
10. 一种编码的检错和纠错能力与该编码的最小码距的大小有直接关系。( )
三 选择题:(每题 1 分,共 10 分)
a) 一个随机过程是平稳随机过程的充分必要条件是 。
(A) 随机过程的数学期望与时间无关,且其相关函数与时间间隔无关;
(B) 随机过程的数学期望与时间无关,且其相关函数仅与时间间隔有关;
(C) 随机过程的数学期望与时间有关,且其相关函数与时间间隔无关;
(D) 随机过程的数学期望与时间有关,且其相关函数与时间间隔有关;
b) 下列属于线性调制的是 。
(A) 相移键控; (B)频移键控; (C)振幅键控; (D)角度调制。
c) 采用同步解调残留边带信号时,只要残留边带滤波器的截止特性在载频处具有 特性,
就能够准确地恢复所需的基带信号。
(A)互补 (B)对称 (C)互补对称 (D)没有特殊要求
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