Journal of Communication Engineering & Systems
Volume 4, Issue 2 (2014)
Published
Table of contents
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Implementation of Compression and Decompression using LZW Algorithm
Abstract: AbstractMany compression techniques are used to minimize the amount of memory that is to be used to store the data. One such compression technique is by using LZW algorithm. The purpose of this is to present a data compression and decompression software to reduce the amount of memory used for storing data. By using data compression, stream of symbols is transformed into codes. For effective compression, the resultant stream of …
Published in Journal of Communication Engineering & Systems · Vol. 4, Issue 2, 2014 · pp. 1–6 Read article
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Relative Performance of BPSK and BFSK in Underground Mine Communication Considering Multipath and Bending Losses
Abstract: AbstractWireless/Mobile signals get strongly attenuated deep inside a building/tunnel/mine. In order to study the performance parameters, underground communication channel needs to be modeled. As a first step here we have practically tried two digital modulation methods BPSK and BFSK for underground communication. Wireless link was able to support data signals. Various measurements were made up to a depth of 30 m inside the mine. Beyond 30 m as more than …
Published in Journal of Communication Engineering & Systems · Vol. 4, Issue 2, 2014 · pp. 12–17 Read article
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Implementation of Direct Sequence Spread Spectrum using MATLAB
Abstract: AbstractA major concern in the design of communication system is to provide secure communication. The system may be required to provide a form of secure communication in a hostile environment such that transmitted signal is not easily detected or recognized by unwanted listeners. This requirement is fulfilled by signaling techniques known collectively as spread spectrum modulation. The main advantage of spread spectrum communication system is its ability to reject interference …
Published in Journal of Communication Engineering & Systems · Vol. 4, Issue 2, 2014 · pp. 7–11 Read article