Different Aspects of Interleaving Techniques in Wireless Communication

Different Aspects of Interleaving Techniques in Wireless Communication

Barnali Das (Gauhati University, India), Manash Pratim Sarma (Gauhati University, India) and Kandarpa Kumar Sarma (Gauhati University, India)
DOI: 10.4018/978-1-4666-8493-5.ch015
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Abstract

This chapter describes the use of certain interleavers for use in a wireless communication set for better accuracy and constancy of the transmitted data. Different interleaver techniques and methods are explored, including the variation of associated system parameters. The performance derived is discussed and the most suitable design is ascertained which is essential for better reliability of a wireless communication system. Bit Error Rate (BER), computational time, mutual information and correlation are the parameters analysed, in case of four types of interleavers viz. general block interleaver, matrix interleaver, random interleaver and convolutional interleaver, considering a fading environment. The hardware implementation using a block interleaver is reported here as a part of this work that shows encouraging results and maybe considered to be a part of a communication system with appropriate modifications.
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Background

From the history of wireless communication, we see that wireless communication is that area of technology which has witnessed an explosive growth over a century. The basic question related with this technology is; how to send a message over the air medium? However, the solution to this question was given by Guglielmo Marconi in 1897, when he invented the radio through which people were able to communicate. After the invention of the radio, another question was raised; what is the best way to send a message across a noisy channel? Since then, many efforts are being taken to improve the performance over a noisy channel. These efforts has led to the birth of many new concepts in the field of wireless communication technology such as digital communication, channel estimation, channel allocation, signal processing for communications, encryption, decryption etc. In the 1940s, one of the important areas of wireless technology called error correcting codes was introduced, which deal with the corrupted information in a noisy channel. Before introduction of the error correcting codes, error detection codes were used to detect errors but the only way to correct the corrupted information was to repeat the transmission. The retransmission of information is not fruitful enough and sometimes it becomes unacceptable for many applications, since it does not guarantee a correct transmission (Asghar, 2010).

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