Transmitter and method to cancel interference in OFDM communication

Abstract

According to the present invention a transmitter for the wireless transmission of information data for example according to the OFDM system is provided. The transmitter comprises a random orthogonal transform (9) for random orthogonal transforming (ROT) of blocks of data to be transmitted by a multiplication of a symbol vector (26) comprising the data of one block, with a matrix (29). Furthermore up conversion element for transmission of data originating from the ROT (9) for random orthogonal transforming (ROT) are provided. According to the invention, the matrix operation uses a matrix (29) comprising n orthogonal columns, wherein n is the number of data samples comprised in one of said blocks, for example the number n used for the following IFFT procedure (10). The number of rows of said matrix (29) is larger than the number of said columns of said matrix (29). According to a further aspect of the present invention, a plurality of mutually orthogonal matrices are used in one base station. With other words, a plurality of orthogonal matrices are allocated to the same base station. The frequency band of OFDM can the be divided by these orthogonal matrices. Therefore, according to this aspect of the present invention, a multiple access technique in OFDM is provided.

Dependencies are inferred from the claim text.