Implementation of Max Log BCJR Algorithm in Turbo Decoder Architecture for Wireless Sensor Networks
Shamila. N1, Manju. M. S2
1Shamila.N, P.G Scholar, Department of Electronics and Communication, Lourdes Matha College of Science and Technology, University of Kerala, (Kerala), India.
2Ms Manju.M.S, Asst. Professor, Department of Electronics and Communication, Lourdes Matha College of Science and Technology, University of Kerala (Kerala), India.
Manuscript received on 15 August 2015 | Revised Manuscript received on 25 August 2015 | Manuscript Published on 30 August 2015 | PP: 189-192 | Volume-4 Issue-6, August 2015 | Retrieval Number: F4211084615/15©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: The transmission of signal in a compressed form can cause a high sensitivity of error in wireless sensor networks. Error control coding (ECC) is used to determine the error occurring in the communication networks during the transmission of information from one point to another. It provides gain and energy reduction during transmission at the cost of decoder power consumption. The BCJR algorithm named after its inventors: Bahl,Cocke, Jelnik and Raviv is critical to iteratively decoded error correcting codes including turbo codes and parity check codes. The turbocodes used in the algorithm helps in the modification of the original BCJR algorithm and helps in the simplification of calculations. In this paper Max-Log-BCJR (Bahl, Cocke, Jelnik and Raviv) Algorithm is used. This algorithm appears to lend itself to both low complexity energy-constrained scenarios, as well as to the high-throughput scenarios. The Algorithm is very sensitive to SNR mismatch and requires accurate estimation of noise variation. This algorithm simply finds the minimum of the LLRs (Logarithmic Likelihood Ratios),so it uses only one ACS Operation.
Keywords: Error Control Coding, Logrithamic Likelihood Ratios, Max-Log Bcjr Algorithm, Turbocodes
Scope of the Article: WSN