Patent ID: 7752520

Claim:
An apparatus, comprising: a transceiver configured to use in transmissions a unified quasi-cyclic low-density parity-check structure for variable code rates and sizes, the structure being determined by an expansion factor z and a unified base matrix definition that is a concatenation of multiple square matrices with a unified base matrix , the number, z, of multiple square matrices for each code rate being determined by the code rate in order to accommodate codes of multiple rates and sizes, all code rates using the unified base matrix, wherein the unified base matrix definition is a concatenation of the following multiple square matrices with the unified base matrix: S m×Rm =( S R m×m |S R−1 m×m | . . . |S 3 m×m |S 2 m×m |S 1 m×m ) and the base matrix for rate (r−1 )/r is S m×rm =( S r m×m |S r−1 m×m | . . . |S 3 m×m |S 2 m×m |S 1 m×m ) For r=2, 3, . . . , R.