Patent ID: 7283783

Claim:
A method of broadcasting multi-layered information in a multi-antenna broadcasting system comprising: identifying at least a first and second layer of information to be transmitted; encoding the first layer of information for transmission, wherein encoding the first layer of information comprises differentially encoding a product of the first layer of information and a first unitary code matrix, U b representing the first unitary code matrix and being selected from the set X b = { [ 1 0 0 1 ] , [ 0 - 1 1 0 ] , [ 0 1 - 1 0 ] , [ - 1 0 0 - 1 ] } such that the product of the first layer of information and the first unitary code matrix is defined by U b εX b ; encoding the second layer of information for transmission, wherein the second layer of information is encoded using a second unitary code matrix different from the first unitary code matrix; and transmitting the first and second layers of the multi-layered information with the multi-antenna broadcasting system.