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| Design of Decomposable-Rate-Compatible LDPC Codes and HARQ Scheme |
| Shen Jin-qi; Xu You-yun; Yu Hui; Gan Xiao-ying |
| Dept. of Electronic Eng., Shanghai Jiaotong Univ., Shanghai 200240, China |
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Abstract A novel method is proposed to construct Decomposable-Rate-Compatible LDPC (D-RC-LDPC) codes. The H matrix of a high rate LDPC codes constructed by this method contains a series of LDPC codes with low rate. The low rate codes can be encoded and decoded respectively which make the system more flexible. A new HARQ scheme based on D-RC-LDPC is also proposed, which is called DB-HARQ (D-RC-LDPC Based HARQ). It can transmit more information through re-transmit scheme and improve the performance of Error Correction Code (ECC) by lowering rate of the ECC. The scheme can improve the FER and throughput performance with 1.5 dB compared with normal ARQ scheme when the code length of is about 2000 and the code rate is 1/2 to 2/3.
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Received: 11 January 2008
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2009, Vol. 31 
