Construction of full rank parity check matrix and systematic encoding for 
nonbinary quasi-cyclic LDPC codes
LIU Bing， ZHANG Yong-yu， WU Dong-wei， TAO Wei
Journal of Systems Engineering and Electronics . 2011, (10): 2331 -2337 .  DOI: 10.3969/j.issn.1001-506X.2011.10.37