Introduction

  • Cheng-Chi Wong
  • Hsie-Chia Chang
Chapter

Abstract

A successful transfer of information over a physical channel or a transmission medium involves a series of procedures. The model of data transmission can be depicted as Fig. 1.1. Generally, it consists of a transmitter, a channel, and a receiver. The elements inside the transmitter and receiver are utilized to guarantee reliable and efficient transmission. For less resources usage, the source encoder uses a shorter symbol sequence to replace the source information, while the source decoder performs the data decompression. When data pass through the channel, they will suffer from the channel noise and may become incorrect. To make sure the accurate information can be delivered to the destination, the channel encoder will transform its inputs into a structured sequence where parity check symbols are introduced. With these redundancies, the channel decoder is capable of recovering the messages even though the received data contain errors caused by channel impairments. In addition to the elements for signal processing, the transmitter needs a modulator to translate the data into analog forms which is suitable for transmission; and the receiver uses a demodulator to convert the channel outputs back to quantized symbols. All of the components determine the quality of data transmission. The development of the corresponding techniques will lead to the advancement of communication systems.

Keywords

Expense 

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Cheng-Chi Wong
    • 1
  • Hsie-Chia Chang
    • 1
  1. 1.Department of Electronics EngineeringNational Chiao-Tung UniversityHsinchuTaiwan

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