Published Online: 15 JAN 2008
Copyright © 2007 by John Wiley & Sons, Inc.
Wiley Encyclopedia of Computer Science and Engineering
How to Cite
Yu, O. 2008. Data Communication. Wiley Encyclopedia of Computer Science and Engineering. .
- Published Online: 15 JAN 2008
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.
- 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