Patent ID: 8693571

Claim:
A transmitter circuit configured to generate a Single-Carrier Discrete Cosine Transform (SC-DCT) OFDM signal for transmission, said transmitter circuit comprising: a plurality of signal processing chains, wherein each signal processing chain configured to map K u input subcarriers to N output subcarriers, according to the formula N=2 S K u , wherein S indicates the integer number of DCT precoder stages included in series within the signal processing chain, wherein S≧1, and wherein said signal processing chain includes a serial-to-parallel converter configured to generate the K u input subcarriers according to a series of information symbols to be transmitted, a prefix or padding circuit configured to add a cyclic prefix or a zero padding to the N output subcarriers, for input to a parallel-to-serial converter that is configured to form the SC-DCT OFDM signal; wherein said signal processing chain further includes one or more DCT precoder stages between the serial-to-parallel converter and the prefix or padding circuit, each such stage i, where i=1, 2, . . . , S, configured to generate 2M i output subcarriers from M i input subcarriers, and to map the M i input subcarriers to even-numbered or odd-numbered ones of the 2M i output subcarriers, in dependence on an even/odd shift control signal applied to the stage, and each such stage comprising a DCT circuit followed by an IDCT circuit; wherein a first one of the DCT precoder stages takes the K u subcarriers as its M 1 input subcarriers, and a last one of the DCT precoder stages provides the N output subcarriers as its 2M S output subcarriers; and wherein each of the plurality of said signal processing chains is associated with different series of information symbols to be transmitted and a shift control circuit that is configured to generate even/odd shift control signals for each said signal processing chain, such that orthogonal patterns of even or odd subcarrier mapping are used between the different signal processing chains.