Simulation and Analysis of Puncturing in Turbo Code using MATLAB

Abstract: In this paper, we proposed some selection criteria for the puncturing vector to achieve excellent performance in terms of BER and gives useful guideline for design of puncturing vector based on simulation result. In this paper, we have compared the performance of turbo code for different puncturing location for two parity branches. Punctured turbo codes may show poor performance due to uneven error protection of input bits after puncturing. The focus of the work is on understanding and design of Punctured Turbo codes. This includes through investigation of central components that influence Turbo code performance, such as encoders and the interleaver. The investigations are carried out for transmission on additive white Gaussian noise channels. For our simulation size of interleaver selected is 1024*1024 and keeping the number of iteration 6. Simulations are conducted on MATLAB at maximum SNR range of 6 dB. In addition we also simulate the performance of punctured turbo codes with increasing the number of iteration and its effect on the performance is analyzed.

Keywords: Turbo codes, Puncturing, iterative decoding, Error floor, AWGN, MATLAB.