LDPCC and OFDM based cooperative communication for wireless sensor networks

Volkan Özduran

doi:10.17694/bajece.688294

Abstract

This paper investigates the low-density parity-check codes and orthogonal frequency division multiplexing technique effects on the relay assisted sensor networks. The investigation utilizes Rician and Rayleigh fading environments for the performance analysis. The investigation also considers two different types of information exchange processes, which are direct and relay assisted cases. In the relay assisted case, the relay terminal operates in amplify-and-forward and decode-and-forward modes. Monte-Carlo based computer simulations reveal that 10-5 bit error rate value is reached at 16.50 dB for low density parity check coded orthogonal frequency division multiplexing over Rician fading environment in decode-and-forward relay protocol. Similarly, 10-5 bit error rate value is reached at 0.36 dB for the low density parity check coded orthogonal frequency division multiplexing over Rician fading environment in amplify-and-forward relay protocol and finally 10-5 bit error rate value is reached at -5.30 dB for low density parity check coded orthogonal frequency division multiplexing over Rician fading environment without relay protocols.

Highlights

WITH THE helping hand of advances in the sensor technology, wireless sensor networks have got a lot of usage areas in recent years
The effect of the orthogonal frequency division multiplexing (OFDM) systems over performance evaluation can be clearly seen from performance curves. 2.70 dB gain is achieved by using OFDM system
When the Low-Density Parity-Check (LDPC) coded signal is performed over fading environment, 10−5 bit error rate (BER) value is reached at 2.30 dB for Rayleigh fading case (K=0), −4.30 dB for LDPC coded OFDM over Rayleigh fading case

Summary

INTRODUCTION

WITH THE helping hand of advances in the sensor technology, wireless sensor networks have got a lot of usage areas in recent years. In [8], authors proposed a joint network-channel coding in cooperative communications model and one of the main aim of their proposed model is to achieve better bit error rate (BER) performance values. In this proposed model, both source and relay nodes have to send their data to the destination node. From aforementioned studies, in order to mini- channel into several sub channels which is called in commonly mize the overall energy consumption, this paper utilizes LDPC subcarriers These subcarriers are orthogonal and overlapping error correcting codes for channel coding process.

LOW DENSITY PARITY CHECK CODES

ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING

SYSTEM MODEL

SIMULATION RESULTS AND DISCUSSION

CONCLUSION