Enhancement of HIPERLaN/2 Systems using Space-Time Coding Mikael gidlund Radio Communication Systems Group Department of Signals, Sensors and Systems Royal Institute of Technology(KTh) SE-100 44 Stockholm. Sweden Email: mikael gidlund@mhse
Introduction (chapter objectives) Complex envelopes and modulated signals Spectra of bandpass signals Nonlinear distortion · Communication circuits(mixers, phase- locked loops, frequency synthesizers, and detectors) Transmitters and receivers · Software radios
Introduction (chapter objectives) Bit error rate for binary systems (unipolar, polar, bipolar, ooK, BPsK, FsK, and MSK Output signal-to-noise ratio for analog systemS(AM, SSB, PM, and Fm)
MIT OCW DATA COMMUNICATION CONTENTS Lectures 2 The Data Link Layer: Framing and Error Detection Lectures 3 4 The Data link layer: arQ Protocols Lectures 5 6 Introduction to Queueing Theory Lectures 8&9 M/G/I Queues
Exercise 1 Before reading the passage, try to answer the questions. 1. how much do you know about the internet? 2. What do people usually do on the internet? 3. What has made the Internet possible? Modern Communication:
Introduction Loosely specified protocol software interface Interface functionality Conceptual interface specification · System calls Two basic approaches to network communication Basic I/ functions in Linux
Multiple Threads Master thread for connection requests Slave threads for handling communication with clients Thread of execution: an abstraction of independent computation Single process can contain one or more threads CSIE, NTUT, Taiwan
Real-Time Transport Protocol Real-time traffic v.S. multimedia traffic Real-time communication is the almost simultaneous production and use of the data, ignoring the short delay in transmission
Chapter 1 Introduction of Electronic commerce 1. 1 Development of Electronic Commerce(e-commerce 1.1.1 Histor Throughout history, attempts to promote new means of communication were simply means with which to increase opportunities for ease, efficiency and security. The foundations on which electronic commerce is based started 125 years ago with the use of telegraph
