Performance analysis and complexity study of LDPC and turbo coding schemes for inter vehicle communications

Abstract

This paper provides a comprehensive investigation of the performance and practical implementation issues of two coding schemes, employing Turbo Codes and low-density parity-check (LDPC) codes, over vehicular ad-hoc networks based on IEEE 802.11p specifications. Using simulation authors present the results of an evaluation of system performance for the two different coding schemes. We concentrate our evaluation on two different environments AWGN and Non Line of Sight propagation environment (Rayleigh Fading). BER (Bit Error Rate) and SNR (Signal to Noise Ratio) values for QPSK modulation are examined and tested. The Forward Error Correction (FEC) system model in the transceiver with the two schemes has been implemented in a Field Programmable Gate Array (FPGA) from Xilinx. At the end, a test-bed was developed using the Nallatech XtremeDsp Development Kit with a Xilinx Virtex-4 FPGA, for comparing simulation results with real time implementations.