Standard Article

Data Communication

  1. Oliver Yu

Published Online: 15 JAN 2008

DOI: 10.1002/9780470050118.ecse488

Wiley Encyclopedia of Computer Science and Engineering

Wiley Encyclopedia of Computer Science and Engineering

How to Cite

Yu, O. 2008. Data Communication. Wiley Encyclopedia of Computer Science and Engineering. .

Author Information

  1. University of Illinois at Chicago, Chicago, Illinois

Publication History

  1. Published Online: 15 JAN 2008

Abstract

This chapter focuses on data communication between directly connected devices through a transmission medium with or without multiaccess, and in particular focuses on the physical and data link layers in the OSI reference model. At the physical layer, devices exchange unstructured data bit stream via modulated electromagnetic signal transmission over a physical link channel. Modulation determines the ratio of the transmitted data bit rate to the signal bandwidth. Data errors may occur because of the signal impairments by channel noises. At the link layer, devices exchange structured data bit stream via frames over a logical link channel with error recovery control to optimize link reliability. Channel coding adds structured redundancy to the data bit stream to enable error detection or error correction. Each frame consists of the data payload and the control overhead bits, which convey control procedures between sending and receiving devices. Link control procedures include flow control, error recovery, and device addressing in multiaccess medium. Emerging multinput–multi-output (MIMO) transmission with multiple signal waveform generators (i.e., antenna array) optimizes throughput capacity and link reliability through space (antenna) time coding.

Keywords:

  • source encoder;
  • channel encoding;
  • digital baseband andpassbandmodulation;
  • spread spectrum;
  • multi-carrier modulation;
  • frequency/time/code/space division multiplexing and multiple access;
  • data link error recovery and flow control;
  • medium access control;
  • MIMO transmission