Patent ID: 8320475

Claim:
A system for measuring inter-carrier interference (ICI) in an Orthogonal Frequency Division Multiplexing (OFDM) system, comprising: a test symbol generator coupled to a transmitter of the OFDM system to generate an N*N orthogonal matrix having N*N test symbols, wherein the test symbols are sent by the transmitter to a receiver of the OFDM system, and the N*N orthogonal matrix is a Hadamard matrix; and an ICI measuring module coupled to the receiver to detect the N*N test symbols received in the receiver and to arrange the test symbols as a receiving matrix in the same way as the orthogonal matrix in the transmitter, and to output the receiving matrix as an ICI matrix of the OFDM system, wherein an element on the kth row, lth column of the ICI matrix represents interference from the lth sub-carrier on the kth sub-carrier, wherein k≠l, wherein the ICI measuring module comprises: an inverse matrix generator to generate an inverse matrix of the orthogonal matrix; and a multiplication module to multiplexes the inverse of the orthogonal matrix with the receiving matrix to output the ICI matrix of the OFDM system.