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

Service times Poisson arrivals at rate n Service time has arbitrary distribution with given E[X] and E[X2I Service times are independent and identically distributed (ID) Independent of arrival times E[service time]=1/u Single Server queue

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

Data Link Layer (DLC) Responsible for reliable transmission of packets over a link Framing: Determine the start and end of packets(sec 2.5) Error Detection: Determine when a packet contains errors ( sec 2.3) Error recovery: Retransmission of packets containing errors(sec 2. 4) DLC layer recovery May be done at higher layer

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

Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science 6. 111-Introductory Digital Systems Laboratory Project Information Introduction The term project in 6 1 1 1 is your opportunity to specify a small digital system. You will

Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science 6.111-Introdi igital Systems Labo Report guide Introduction The purpose of this memorandum is to describe general requirements for the reports you

assachusetts Institute of Technology Department of Electrical Engineering and Computer Science 6. 111-Introductory Digital Systems Laboratory Project resources Project resources are allocated on a per student basis. This means that a two-person

Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science 6. 111-Introductory Digital Systems Laboratory Project suggestions In past years, a great variety of projects have been successfully completed. The following is a list of some of these completed final project reports

Transmit Gain Optimization for Space Time block Coding Wireless Systems with Co-channel Interference Nevio benvenuto and Stefano Tomasin Dipartimento di Elettronica e Informatica, Universita di Padova