一、单边带调制(SSB) 单边带信号的产生方法通常有滤波法和相移法。 a)用滤波法形成单边带信号产生SSB信号最直观的方法是让双边带信号通过一个边带滤波器,保留所需要的一个边带,滤除不要的边带

Computer Science 6.111-Introductory Digital Sy Laborator How to Make Your 6.1ll Project Work There are a few tricks of the trade \which allow an experienced digital designer to fix problems quickly. This note is an attempt to fill you in on some with which you might not

Queueing Systems Used for analyzing network performance In packet networks, events are random Random packet arrivals Random packet lengths While at the physical layer we were concerned with bit-error-rate, at the network layer we care about delays How long does a packet spend waiting in buffers

Automatic Repeat ReQuest(ARQ) When the receiver detects errors in a packet, how does it let the transmitter know to re-send the corresponding packet? Systems which automatically request the retransmission of missing packets or packets with errors are called ARQ systems Three common schemes Stop Wait

前述普通精馏方式是以溶液中各个组分的挥发度不同作为分离的依据,若各组分的挥发度差异越大 (即相对挥发度a越大),越易分离。但工业生产中需要分离的溶液,也有不少其挥发度很接近或具有恒 沸点(最高或最低恒沸点),对于这类溶液的分离,用前诉的普通精馏方式就难以实现。例如:

自测题 一、(1)×(2)√(3)√×(4√(5)×(6)√ 二、(1)B(2)C(3)A(4)D 三、T1,R1、R2、R3,R、D2,T2、Rc,Ro

IEEE TRANSACTIONS ON COMMUNICATIONS. VOL 50. NO. 1 JANUARY 2002 LDPC-Based Space-Time Coded OFDM Systems Over Correlated Fading Channels: Performance Analysis and Receiver design Ben Lu, Student Member, IEEE, Xiaodong Wang, Member, IEEE, and Krishna R Narayanan, Member: IEEE AbstrackWe consider a space-time coded (STC) orthogonal systems integrate the techniques of antenna array spatial diver-

Related Information Rock music emerged during the mid- 1950s to become the major popular musical form of young audience in the United States and Western Europe. Its stylistic scope is too broad to be encompassed by any single definition; the only feature common to all rock music is a heavy emphasis on the beat

Part L Reading comprehension (40% Directions: There are some tasks for you to fulfill. You should read the materials carefully and do the tasks as you are instructed Task 1 (10%) Directions: After reading the following passage, you will find 5 questions or unfinished statements. For each question or statement there are 4 choices marked a)

Part I(25%) Directions: This part is to test your ability to construct grammatically correct sentences. It consists of 2 sections Section A Direction: In this section, there are15 incomplete. You are required to complete each one by deciding on the most appropriate words from the four choices