you can decode the ldpc code with algorithm sum-product & itterative decoding&porto graph.also you can use measure of ber of code. in fact you calculate ber and gain of code

suboptimal decoding for LDPC are based on belief propagation. Basically, the sum-product and the min-sum algorithms are used. The performance measure you can use to compare with the state of the art can be the bit error rate or the frame error rate.

Thanks

Iterative decoding technique such as sphere decoding is going to be efficient

thanks all that was helpful