OFDM with QPSK - File Exchange - MATLAB Central

i have been working on viterbisim.m which is a built-in matlab example for understanding the ber tool.. i that i have tried to change the code rate to 2/3 with trellis structure of t = poly2trellis([5 4],[23 35 0; 0 5 13]); but output ber graph is complet

www.mathworks.com