Abstract: A rate-compatible low-density parity-check code(LDPC) scheme is presented.According to the LDPC code construction algorithm and parameter sets of IEEE 802.16e standard,puncturing and extending,approaches are investigated,with coding rate from 0.1 to 0.9.Performance comparison and analysis are presented under various code rates using aforementioned two schemes,simulation results demonstrate that the extending technique can achieve larger code rate range than puncturing.Extending scheme can meet most service requirements for code rate with good performance and low implementation complexity,and can be treated as a pragmatic way for link adaptation in IEEE 802.16e such as hybrid ARQ(HARQ).